third_party/libxml/src/xmlwriter.c

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This source file includes following definitions.
xmlWriterErrMsg
xmlWriterErrMsgInt
xmlNewTextWriter
xmlNewTextWriterFilename
xmlNewTextWriterMemory
xmlNewTextWriterPushParser
xmlNewTextWriterDoc
xmlNewTextWriterTree
xmlFreeTextWriter
xmlTextWriterStartDocument
xmlTextWriterEndDocument
xmlTextWriterStartComment
xmlTextWriterEndComment
xmlTextWriterWriteFormatComment
xmlTextWriterWriteVFormatComment
xmlTextWriterWriteComment
xmlTextWriterStartElement
xmlTextWriterStartElementNS
xmlTextWriterEndElement
xmlTextWriterFullEndElement
xmlTextWriterWriteFormatRaw
xmlTextWriterWriteVFormatRaw
xmlTextWriterWriteRawLen
xmlTextWriterWriteRaw
xmlTextWriterWriteFormatString
xmlTextWriterWriteVFormatString
xmlTextWriterWriteString
xmlOutputBufferWriteBase64
xmlTextWriterWriteBase64
xmlOutputBufferWriteBinHex
xmlTextWriterWriteBinHex
xmlTextWriterStartAttribute
xmlTextWriterStartAttributeNS
xmlTextWriterEndAttribute
xmlTextWriterWriteFormatAttribute
xmlTextWriterWriteVFormatAttribute
xmlTextWriterWriteAttribute
xmlTextWriterWriteFormatAttributeNS
xmlTextWriterWriteVFormatAttributeNS
xmlTextWriterWriteAttributeNS
xmlTextWriterWriteFormatElement
xmlTextWriterWriteVFormatElement
xmlTextWriterWriteElement
xmlTextWriterWriteFormatElementNS
xmlTextWriterWriteVFormatElementNS
xmlTextWriterWriteElementNS
xmlTextWriterStartPI
xmlTextWriterEndPI
xmlTextWriterWriteFormatPI
xmlTextWriterWriteVFormatPI
xmlTextWriterWritePI
xmlTextWriterStartCDATA
xmlTextWriterEndCDATA
xmlTextWriterWriteFormatCDATA
xmlTextWriterWriteVFormatCDATA
xmlTextWriterWriteCDATA
xmlTextWriterStartDTD
xmlTextWriterEndDTD
xmlTextWriterWriteFormatDTD
xmlTextWriterWriteVFormatDTD
xmlTextWriterWriteDTD
xmlTextWriterStartDTDElement
xmlTextWriterEndDTDElement
xmlTextWriterWriteFormatDTDElement
xmlTextWriterWriteVFormatDTDElement
xmlTextWriterWriteDTDElement
xmlTextWriterStartDTDAttlist
xmlTextWriterEndDTDAttlist
xmlTextWriterWriteFormatDTDAttlist
xmlTextWriterWriteVFormatDTDAttlist
xmlTextWriterWriteDTDAttlist
xmlTextWriterStartDTDEntity
xmlTextWriterEndDTDEntity
xmlTextWriterWriteFormatDTDInternalEntity
xmlTextWriterWriteVFormatDTDInternalEntity
xmlTextWriterWriteDTDEntity
xmlTextWriterWriteDTDInternalEntity
xmlTextWriterWriteDTDExternalEntity
xmlTextWriterWriteDTDExternalEntityContents
xmlTextWriterWriteDTDNotation
xmlTextWriterFlush
xmlFreeTextWriterStackEntry
xmlCmpTextWriterStackEntry
xmlTextWriterOutputNSDecl
xmlFreeTextWriterNsStackEntry
xmlCmpTextWriterNsStackEntry
xmlTextWriterWriteDocCallback
xmlTextWriterCloseDocCallback
xmlTextWriterVSprintf
xmlTextWriterStartDocumentCallback
xmlTextWriterSetIndent
xmlTextWriterSetIndentString
xmlTextWriterWriteIndent
xmlTextWriterHandleStateDependencies

/*
 * xmlwriter.c: XML text writer implementation
 *
 * For license and disclaimer see the license and disclaimer of
 * libxml2.
 *
 * alfred@mickautsch.de
 */

#define IN_LIBXML
#include "libxml.h"
#include <string.h>

#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/uri.h>
#include <libxml/HTMLtree.h>

#ifdef LIBXML_WRITER_ENABLED

#include <libxml/xmlwriter.h>

#define B64LINELEN 72
#define B64CRLF "\r\n"

/*
 * The following VA_COPY was coded following an example in
 * the Samba project.  It may not be sufficient for some
 * esoteric implementations of va_list (i.e. it may need
 * something involving a memcpy) but (hopefully) will be
 * sufficient for libxml2.
 */
#ifndef VA_COPY
  #ifdef HAVE_VA_COPY
    #define VA_COPY(dest, src) va_copy(dest, src)
  #else
    #ifdef HAVE___VA_COPY
      #define VA_COPY(dest,src) __va_copy(dest, src)
    #else
      #define VA_COPY(dest,src) (dest) = (src)
    #endif
  #endif
#endif

/*
 * Types are kept private
 */
typedef enum {
    XML_TEXTWRITER_NONE = 0,
    XML_TEXTWRITER_NAME,
    XML_TEXTWRITER_ATTRIBUTE,
    XML_TEXTWRITER_TEXT,
    XML_TEXTWRITER_PI,
    XML_TEXTWRITER_PI_TEXT,
    XML_TEXTWRITER_CDATA,
    XML_TEXTWRITER_DTD,
    XML_TEXTWRITER_DTD_TEXT,
    XML_TEXTWRITER_DTD_ELEM,
    XML_TEXTWRITER_DTD_ELEM_TEXT,
    XML_TEXTWRITER_DTD_ATTL,
    XML_TEXTWRITER_DTD_ATTL_TEXT,
    XML_TEXTWRITER_DTD_ENTY,    /* entity */
    XML_TEXTWRITER_DTD_ENTY_TEXT,
    XML_TEXTWRITER_DTD_PENT,    /* parameter entity */
    XML_TEXTWRITER_COMMENT
} xmlTextWriterState;

typedef struct _xmlTextWriterStackEntry xmlTextWriterStackEntry;

struct _xmlTextWriterStackEntry {
    xmlChar *name;
    xmlTextWriterState state;
};

typedef struct _xmlTextWriterNsStackEntry xmlTextWriterNsStackEntry;
struct _xmlTextWriterNsStackEntry {
    xmlChar *prefix;
    xmlChar *uri;
    xmlLinkPtr elem;
};

struct _xmlTextWriter {
    xmlOutputBufferPtr out;     /* output buffer */
    xmlListPtr nodes;           /* element name stack */
    xmlListPtr nsstack;         /* name spaces stack */
    int level;
    int indent;                 /* enable indent */
    int doindent;               /* internal indent flag */
    xmlChar *ichar;             /* indent character */
    char qchar;                 /* character used for quoting attribute values */
    xmlParserCtxtPtr ctxt;
    int no_doc_free;
    xmlDocPtr doc;
};

static void xmlFreeTextWriterStackEntry(xmlLinkPtr lk);
static int xmlCmpTextWriterStackEntry(const void *data0,
                                      const void *data1);
static int xmlTextWriterOutputNSDecl(xmlTextWriterPtr writer);
static void xmlFreeTextWriterNsStackEntry(xmlLinkPtr lk);
static int xmlCmpTextWriterNsStackEntry(const void *data0,
                                        const void *data1);
static int xmlTextWriterWriteDocCallback(void *context,
                                         const xmlChar * str, int len);
static int xmlTextWriterCloseDocCallback(void *context);

static xmlChar *xmlTextWriterVSprintf(const char *format, va_list argptr);
static int xmlOutputBufferWriteBase64(xmlOutputBufferPtr out, int len,
                                      const unsigned char *data);
static void xmlTextWriterStartDocumentCallback(void *ctx);
static int xmlTextWriterWriteIndent(xmlTextWriterPtr writer);
static int
  xmlTextWriterHandleStateDependencies(xmlTextWriterPtr writer,
                                       xmlTextWriterStackEntry * p);

/**
 * xmlWriterErrMsg:
 * @ctxt:  a writer context
 * @error:  the error number
 * @msg:  the error message
 *
 * Handle a writer error
 */
static void
xmlWriterErrMsg(xmlTextWriterPtr ctxt, xmlParserErrors error,
               const char *msg)
{
    if (ctxt != NULL) {
        __xmlRaiseError(NULL, NULL, NULL, ctxt->ctxt,
                    NULL, XML_FROM_WRITER, error, XML_ERR_FATAL,
                    NULL, 0, NULL, NULL, NULL, 0, 0, "%s", msg);
    } else {
        __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_WRITER, error,
                    XML_ERR_FATAL, NULL, 0, NULL, NULL, NULL, 0, 0, "%s", msg);
    }
}

/**
 * xmlWriterErrMsgInt:
 * @ctxt:  a writer context
 * @error:  the error number
 * @msg:  the error message
 * @val:  an int
 *
 * Handle a writer error
 */
static void
xmlWriterErrMsgInt(xmlTextWriterPtr ctxt, xmlParserErrors error,
               const char *msg, int val)
{
    if (ctxt != NULL) {
        __xmlRaiseError(NULL, NULL, NULL, ctxt->ctxt,
                    NULL, XML_FROM_WRITER, error, XML_ERR_FATAL,
                    NULL, 0, NULL, NULL, NULL, val, 0, msg, val);
    } else {
        __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_WRITER, error,
                    XML_ERR_FATAL, NULL, 0, NULL, NULL, NULL, val, 0, msg, val);
    }
}

/**
 * xmlNewTextWriter:
 * @out:  an xmlOutputBufferPtr
 *
 * Create a new xmlNewTextWriter structure using an xmlOutputBufferPtr
 * NOTE: the @out parameter will be deallocated when the writer is closed
 *       (if the call succeed.)
 *
 * Returns the new xmlTextWriterPtr or NULL in case of error
 */
xmlTextWriterPtr
xmlNewTextWriter(xmlOutputBufferPtr out)
{
    xmlTextWriterPtr ret;

    ret = (xmlTextWriterPtr) xmlMalloc(sizeof(xmlTextWriter));
    if (ret == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlNewTextWriter : out of memory!\n");
        return NULL;
    }
    memset(ret, 0, (size_t) sizeof(xmlTextWriter));

    ret->nodes = xmlListCreate((xmlListDeallocator)
                               xmlFreeTextWriterStackEntry,
                               (xmlListDataCompare)
                               xmlCmpTextWriterStackEntry);
    if (ret->nodes == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlNewTextWriter : out of memory!\n");
        xmlFree(ret);
        return NULL;
    }

    ret->nsstack = xmlListCreate((xmlListDeallocator)
                                 xmlFreeTextWriterNsStackEntry,
                                 (xmlListDataCompare)
                                 xmlCmpTextWriterNsStackEntry);
    if (ret->nsstack == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlNewTextWriter : out of memory!\n");
        xmlListDelete(ret->nodes);
        xmlFree(ret);
        return NULL;
    }

    ret->out = out;
    ret->ichar = xmlStrdup(BAD_CAST " ");
    ret->qchar = '"';

    if (!ret->ichar) {
        xmlListDelete(ret->nodes);
        xmlListDelete(ret->nsstack);
        xmlFree(ret);
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlNewTextWriter : out of memory!\n");
        return NULL;
    }

    ret->doc = xmlNewDoc(NULL);

    ret->no_doc_free = 0;

    return ret;
}

/**
 * xmlNewTextWriterFilename:
 * @uri:  the URI of the resource for the output
 * @compression:  compress the output?
 *
 * Create a new xmlNewTextWriter structure with @uri as output
 *
 * Returns the new xmlTextWriterPtr or NULL in case of error
 */
xmlTextWriterPtr
xmlNewTextWriterFilename(const char *uri, int compression)
{
    xmlTextWriterPtr ret;
    xmlOutputBufferPtr out;

    out = xmlOutputBufferCreateFilename(uri, NULL, compression);
    if (out == NULL) {
        xmlWriterErrMsg(NULL, XML_IO_EIO,
                        "xmlNewTextWriterFilename : cannot open uri\n");
        return NULL;
    }

    ret = xmlNewTextWriter(out);
    if (ret == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlNewTextWriterFilename : out of memory!\n");
        xmlOutputBufferClose(out);
        return NULL;
    }

    ret->indent = 0;
    ret->doindent = 0;
    return ret;
}

/**
 * xmlNewTextWriterMemory:
 * @buf:  xmlBufferPtr
 * @compression:  compress the output?
 *
 * Create a new xmlNewTextWriter structure with @buf as output
 * TODO: handle compression
 *
 * Returns the new xmlTextWriterPtr or NULL in case of error
 */
xmlTextWriterPtr
xmlNewTextWriterMemory(xmlBufferPtr buf, int compression ATTRIBUTE_UNUSED)
{
    xmlTextWriterPtr ret;
    xmlOutputBufferPtr out;

/*::todo handle compression */
    out = xmlOutputBufferCreateBuffer(buf, NULL);

    if (out == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlNewTextWriterMemory : out of memory!\n");
        return NULL;
    }

    ret = xmlNewTextWriter(out);
    if (ret == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlNewTextWriterMemory : out of memory!\n");
        xmlOutputBufferClose(out);
        return NULL;
    }

    return ret;
}

/**
 * xmlNewTextWriterPushParser:
 * @ctxt: xmlParserCtxtPtr to hold the new XML document tree
 * @compression:  compress the output?
 *
 * Create a new xmlNewTextWriter structure with @ctxt as output
 * NOTE: the @ctxt context will be freed with the resulting writer
 *       (if the call succeeds).
 * TODO: handle compression
 *
 * Returns the new xmlTextWriterPtr or NULL in case of error
 */
xmlTextWriterPtr
xmlNewTextWriterPushParser(xmlParserCtxtPtr ctxt,
                           int compression ATTRIBUTE_UNUSED)
{
    xmlTextWriterPtr ret;
    xmlOutputBufferPtr out;

    if (ctxt == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlNewTextWriterPushParser : invalid context!\n");
        return NULL;
    }

    out = xmlOutputBufferCreateIO((xmlOutputWriteCallback)
                                  xmlTextWriterWriteDocCallback,
                                  (xmlOutputCloseCallback)
                                  xmlTextWriterCloseDocCallback,
                                  (void *) ctxt, NULL);
    if (out == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlNewTextWriterPushParser : error at xmlOutputBufferCreateIO!\n");
        return NULL;
    }

    ret = xmlNewTextWriter(out);
    if (ret == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlNewTextWriterPushParser : error at xmlNewTextWriter!\n");
        xmlOutputBufferClose(out);
        return NULL;
    }

    ret->ctxt = ctxt;

    return ret;
}

/**
 * xmlNewTextWriterDoc:
 * @doc: address of a xmlDocPtr to hold the new XML document tree
 * @compression:  compress the output?
 *
 * Create a new xmlNewTextWriter structure with @*doc as output
 *
 * Returns the new xmlTextWriterPtr or NULL in case of error
 */
xmlTextWriterPtr
xmlNewTextWriterDoc(xmlDocPtr * doc, int compression)
{
    xmlTextWriterPtr ret;
    xmlSAXHandler saxHandler;
    xmlParserCtxtPtr ctxt;

    memset(&saxHandler, '\0', sizeof(saxHandler));
    xmlSAX2InitDefaultSAXHandler(&saxHandler, 1);
    saxHandler.startDocument = xmlTextWriterStartDocumentCallback;
    saxHandler.startElement = xmlSAX2StartElement;
    saxHandler.endElement = xmlSAX2EndElement;

    ctxt = xmlCreatePushParserCtxt(&saxHandler, NULL, NULL, 0, NULL);
    if (ctxt == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                "xmlNewTextWriterDoc : error at xmlCreatePushParserCtxt!\n");
        return NULL;
    }
    /*
     * For some reason this seems to completely break if node names
     * are interned.
     */
    ctxt->dictNames = 0;

    ctxt->myDoc = xmlNewDoc(BAD_CAST XML_DEFAULT_VERSION);
    if (ctxt->myDoc == NULL) {
        xmlFreeParserCtxt(ctxt);
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlNewTextWriterDoc : error at xmlNewDoc!\n");
        return NULL;
    }

    ret = xmlNewTextWriterPushParser(ctxt, compression);
    if (ret == NULL) {
        xmlFreeDoc(ctxt->myDoc);
        xmlFreeParserCtxt(ctxt);
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                "xmlNewTextWriterDoc : error at xmlNewTextWriterPushParser!\n");
        return NULL;
    }

    xmlSetDocCompressMode(ctxt->myDoc, compression);

    if (doc != NULL) {
        *doc = ctxt->myDoc;
        ret->no_doc_free = 1;
    }

    return ret;
}

/**
 * xmlNewTextWriterTree:
 * @doc: xmlDocPtr
 * @node: xmlNodePtr or NULL for doc->children
 * @compression:  compress the output?
 *
 * Create a new xmlNewTextWriter structure with @doc as output
 * starting at @node
 *
 * Returns the new xmlTextWriterPtr or NULL in case of error
 */
xmlTextWriterPtr
xmlNewTextWriterTree(xmlDocPtr doc, xmlNodePtr node, int compression)
{
    xmlTextWriterPtr ret;
    xmlSAXHandler saxHandler;
    xmlParserCtxtPtr ctxt;

    if (doc == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlNewTextWriterTree : invalid document tree!\n");
        return NULL;
    }

    memset(&saxHandler, '\0', sizeof(saxHandler));
    xmlSAX2InitDefaultSAXHandler(&saxHandler, 1);
    saxHandler.startDocument = xmlTextWriterStartDocumentCallback;
    saxHandler.startElement = xmlSAX2StartElement;
    saxHandler.endElement = xmlSAX2EndElement;

    ctxt = xmlCreatePushParserCtxt(&saxHandler, NULL, NULL, 0, NULL);
    if (ctxt == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlNewTextWriterDoc : error at xmlCreatePushParserCtxt!\n");
        return NULL;
    }
    /*
     * For some reason this seems to completely break if node names
     * are interned.
     */
    ctxt->dictNames = 0;

    ret = xmlNewTextWriterPushParser(ctxt, compression);
    if (ret == NULL) {
        xmlFreeParserCtxt(ctxt);
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlNewTextWriterDoc : error at xmlNewTextWriterPushParser!\n");
        return NULL;
    }

    ctxt->myDoc = doc;
    ctxt->node = node;
    ret->no_doc_free = 1;

    xmlSetDocCompressMode(doc, compression);

    return ret;
}

/**
 * xmlFreeTextWriter:
 * @writer:  the xmlTextWriterPtr
 *
 * Deallocate all the resources associated to the writer
 */
void
xmlFreeTextWriter(xmlTextWriterPtr writer)
{
    if (writer == NULL)
        return;

    if (writer->out != NULL)
        xmlOutputBufferClose(writer->out);

    if (writer->nodes != NULL)
        xmlListDelete(writer->nodes);

    if (writer->nsstack != NULL)
        xmlListDelete(writer->nsstack);

    if (writer->ctxt != NULL) {
        if ((writer->ctxt->myDoc != NULL) && (writer->no_doc_free == 0)) {
            xmlFreeDoc(writer->ctxt->myDoc);
            writer->ctxt->myDoc = NULL;
        }
        xmlFreeParserCtxt(writer->ctxt);
    }

    if (writer->doc != NULL)
        xmlFreeDoc(writer->doc);

    if (writer->ichar != NULL)
        xmlFree(writer->ichar);
    xmlFree(writer);
}

/**
 * xmlTextWriterStartDocument:
 * @writer:  the xmlTextWriterPtr
 * @version:  the xml version ("1.0") or NULL for default ("1.0")
 * @encoding:  the encoding or NULL for default
 * @standalone: "yes" or "no" or NULL for default
 *
 * Start a new xml document
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartDocument(xmlTextWriterPtr writer, const char *version,
                           const char *encoding, const char *standalone)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlCharEncodingHandlerPtr encoder;

    if ((writer == NULL) || (writer->out == NULL)) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterStartDocument : invalid writer!\n");
        return -1;
    }

    lk = xmlListFront(writer->nodes);
    if ((lk != NULL) && (xmlLinkGetData(lk) != NULL)) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterStartDocument : not allowed in this context!\n");
        return -1;
    }

    encoder = NULL;
    if (encoding != NULL) {
        encoder = xmlFindCharEncodingHandler(encoding);
        if (encoder == NULL) {
            xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                            "xmlTextWriterStartDocument : out of memory!\n");
            return -1;
        }
    }

    writer->out->encoder = encoder;
    if (encoder != NULL) {
        if (writer->out->conv == NULL) {
            writer->out->conv = xmlBufferCreateSize(4000);
        }
        xmlCharEncOutFunc(encoder, writer->out->conv, NULL);
        if ((writer->doc != NULL) && (writer->doc->encoding == NULL))
            writer->doc->encoding = xmlStrdup((xmlChar *)writer->out->encoder->name);
    } else
        writer->out->conv = NULL;

    sum = 0;
    count = xmlOutputBufferWriteString(writer->out, "<?xml version=");
    if (count < 0)
        return -1;
    sum += count;
    count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
    if (count < 0)
        return -1;
    sum += count;
    if (version != 0)
        count = xmlOutputBufferWriteString(writer->out, version);
    else
        count = xmlOutputBufferWriteString(writer->out, "1.0");
    if (count < 0)
        return -1;
    sum += count;
    count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
    if (count < 0)
        return -1;
    sum += count;
    if (writer->out->encoder != 0) {
        count = xmlOutputBufferWriteString(writer->out, " encoding=");
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
        count =
            xmlOutputBufferWriteString(writer->out,
                                       writer->out->encoder->name);
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    if (standalone != 0) {
        count = xmlOutputBufferWriteString(writer->out, " standalone=");
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWriteString(writer->out, standalone);
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, "?>\n");
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndDocument:
 * @writer:  the xmlTextWriterPtr
 *
 * End an xml document. All open elements are closed, and
 * the content is flushed to the output.
 *
 * Returns the bytes written or -1 in case of error
 */
int
xmlTextWriterEndDocument(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterEndDocument : invalid writer!\n");
        return -1;
    }

    sum = 0;
    while ((lk = xmlListFront(writer->nodes)) != NULL) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p == 0)
            break;
        switch (p->state) {
            case XML_TEXTWRITER_NAME:
            case XML_TEXTWRITER_ATTRIBUTE:
            case XML_TEXTWRITER_TEXT:
                count = xmlTextWriterEndElement(writer);
                if (count < 0)
                    return -1;
                sum += count;
                break;
            case XML_TEXTWRITER_PI:
            case XML_TEXTWRITER_PI_TEXT:
                count = xmlTextWriterEndPI(writer);
                if (count < 0)
                    return -1;
                sum += count;
                break;
            case XML_TEXTWRITER_CDATA:
                count = xmlTextWriterEndCDATA(writer);
                if (count < 0)
                    return -1;
                sum += count;
                break;
            case XML_TEXTWRITER_DTD:
            case XML_TEXTWRITER_DTD_TEXT:
            case XML_TEXTWRITER_DTD_ELEM:
            case XML_TEXTWRITER_DTD_ELEM_TEXT:
            case XML_TEXTWRITER_DTD_ATTL:
            case XML_TEXTWRITER_DTD_ATTL_TEXT:
            case XML_TEXTWRITER_DTD_ENTY:
            case XML_TEXTWRITER_DTD_ENTY_TEXT:
            case XML_TEXTWRITER_DTD_PENT:
                count = xmlTextWriterEndDTD(writer);
                if (count < 0)
                    return -1;
                sum += count;
                break;
            case XML_TEXTWRITER_COMMENT:
                count = xmlTextWriterEndComment(writer);
                if (count < 0)
                    return -1;
                sum += count;
                break;
            default:
                break;
        }
    }

    if (!writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        if (count < 0)
            return -1;
        sum += count;
    }

    sum += xmlTextWriterFlush(writer);

    return sum;
}

/**
 * xmlTextWriterStartComment:
 * @writer:  the xmlTextWriterPtr
 *
 * Start an xml comment.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartComment(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterStartComment : invalid writer!\n");
        return -1;
    }

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            switch (p->state) {
                case XML_TEXTWRITER_TEXT:
                case XML_TEXTWRITER_NONE:
                    break;
                case XML_TEXTWRITER_NAME:
                    /* Output namespace declarations */
                    count = xmlTextWriterOutputNSDecl(writer);
                    if (count < 0)
                        return -1;
                    sum += count;
                    count = xmlOutputBufferWriteString(writer->out, ">");
                    if (count < 0)
                        return -1;
                    sum += count;
                    if (writer->indent) {
                        count =
                            xmlOutputBufferWriteString(writer->out, "\n");
                        if (count < 0)
                            return -1;
                        sum += count;
                    }
                    p->state = XML_TEXTWRITER_TEXT;
                    break;
                default:
                    return -1;
            }
        }
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartElement : out of memory!\n");
        return -1;
    }

    p->name = NULL;
    p->state = XML_TEXTWRITER_COMMENT;

    xmlListPushFront(writer->nodes, p);

    if (writer->indent) {
        count = xmlTextWriterWriteIndent(writer);
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, "<!--");
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndComment:
 * @writer:  the xmlTextWriterPtr
 *
 * End the current xml coment.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndComment(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterEndComment : invalid writer!\n");
        return -1;
    }

    lk = xmlListFront(writer->nodes);
    if (lk == 0) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterEndComment : not allowed in this context!\n");
        return -1;
    }

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    sum = 0;
    switch (p->state) {
        case XML_TEXTWRITER_COMMENT:
            count = xmlOutputBufferWriteString(writer->out, "-->");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    if (writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        if (count < 0)
            return -1;
        sum += count;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterWriteFormatComment:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write an xml comment.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatComment(xmlTextWriterPtr writer,
                                const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatComment(writer, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatComment:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write an xml comment.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatComment(xmlTextWriterPtr writer,
                                 const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterWriteVFormatComment : invalid writer!\n");
        return -1;
    }

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteComment(writer, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteComment:
 * @writer:  the xmlTextWriterPtr
 * @content:  comment string
 *
 * Write an xml comment.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteComment(xmlTextWriterPtr writer, const xmlChar * content)
{
    int count;
    int sum;

    sum = 0;
    count = xmlTextWriterStartComment(writer);
    if (count < 0)
        return -1;
    sum += count;
    count = xmlTextWriterWriteString(writer, content);
    if (count < 0)
        return -1;
    sum += count;
    count = xmlTextWriterEndComment(writer);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  element name
 *
 * Start an xml element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartElement(xmlTextWriterPtr writer, const xmlChar * name)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if ((writer == NULL) || (name == NULL) || (*name == '\0'))
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            switch (p->state) {
                case XML_TEXTWRITER_PI:
                case XML_TEXTWRITER_PI_TEXT:
                    return -1;
                case XML_TEXTWRITER_NONE:
                    break;
                                case XML_TEXTWRITER_ATTRIBUTE:
                                        count = xmlTextWriterEndAttribute(writer);
                                        if (count < 0)
                                                return -1;
                                        sum += count;
                                        /* fallthrough */
                case XML_TEXTWRITER_NAME:
                    /* Output namespace declarations */
                    count = xmlTextWriterOutputNSDecl(writer);
                    if (count < 0)
                        return -1;
                    sum += count;
                    count = xmlOutputBufferWriteString(writer->out, ">");
                    if (count < 0)
                        return -1;
                    sum += count;
                    if (writer->indent)
                        count =
                            xmlOutputBufferWriteString(writer->out, "\n");
                    p->state = XML_TEXTWRITER_TEXT;
                    break;
                default:
                    break;
            }
        }
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartElement : out of memory!\n");
        return -1;
    }

    p->name = xmlStrdup(name);
    if (p->name == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartElement : out of memory!\n");
        xmlFree(p);
        return -1;
    }
    p->state = XML_TEXTWRITER_NAME;

    xmlListPushFront(writer->nodes, p);

    if (writer->indent) {
        count = xmlTextWriterWriteIndent(writer);
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, "<");
    if (count < 0)
        return -1;
    sum += count;
    count =
        xmlOutputBufferWriteString(writer->out, (const char *) p->name);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartElementNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix or NULL
 * @name:  element local name
 * @namespaceURI:  namespace URI or NULL
 *
 * Start an xml element with namespace support.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartElementNS(xmlTextWriterPtr writer,
                            const xmlChar * prefix, const xmlChar * name,
                            const xmlChar * namespaceURI)
{
    int count;
    int sum;
    xmlChar *buf;

    if ((writer == NULL) || (name == NULL) || (*name == '\0'))
        return -1;

    buf = NULL;
    if (prefix != 0) {
        buf = xmlStrdup(prefix);
        buf = xmlStrcat(buf, BAD_CAST ":");
    }
    buf = xmlStrcat(buf, name);

    sum = 0;
    count = xmlTextWriterStartElement(writer, buf);
    xmlFree(buf);
    if (count < 0)
        return -1;
    sum += count;

    if (namespaceURI != 0) {
        xmlTextWriterNsStackEntry *p = (xmlTextWriterNsStackEntry *) 
        xmlMalloc(sizeof(xmlTextWriterNsStackEntry));
        if (p == 0) {
            xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY, 
                            "xmlTextWriterStartElementNS : out of memory!\n");
            return -1;
        }

        buf = xmlStrdup(BAD_CAST "xmlns");
        if (prefix != 0) {
            buf = xmlStrcat(buf, BAD_CAST ":");
            buf = xmlStrcat(buf, prefix);
        }

        p->prefix = buf;
        p->uri = xmlStrdup(namespaceURI);
        if (p->uri == 0) {
            xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                            "xmlTextWriterStartElementNS : out of memory!\n");
            xmlFree(p);
            return -1;
        }
        p->elem = xmlListFront(writer->nodes);

        xmlListPushFront(writer->nsstack, p);
    }

    return sum;
}

/**
 * xmlTextWriterEndElement:
 * @writer:  the xmlTextWriterPtr
 *
 * End the current xml element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndElement(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    lk = xmlListFront(writer->nodes);
    if (lk == 0) {
        xmlListDelete(writer->nsstack);
        writer->nsstack = NULL;
        return -1;
    }

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0) {
        xmlListDelete(writer->nsstack);
        writer->nsstack = NULL;
        return -1;
    }

    sum = 0;
    switch (p->state) {
        case XML_TEXTWRITER_ATTRIBUTE:
            count = xmlTextWriterEndAttribute(writer);
            if (count < 0) {
                xmlListDelete(writer->nsstack);
                writer->nsstack = NULL;
                return -1;
            }
            sum += count;
            /* fallthrough */
        case XML_TEXTWRITER_NAME:
            /* Output namespace declarations */
            count = xmlTextWriterOutputNSDecl(writer);
            if (count < 0)
                return -1;
            sum += count;

            if (writer->indent) /* next element needs indent */
                writer->doindent = 1;
            count = xmlOutputBufferWriteString(writer->out, "/>");
            if (count < 0)
                return -1;
            sum += count;
            break;
        case XML_TEXTWRITER_TEXT:
            if ((writer->indent) && (writer->doindent)) {
                count = xmlTextWriterWriteIndent(writer);
                sum += count;
                writer->doindent = 1;
            } else
                writer->doindent = 1;
            count = xmlOutputBufferWriteString(writer->out, "</");
            if (count < 0)
                return -1;
            sum += count;
            count = xmlOutputBufferWriteString(writer->out,
                                               (const char *) p->name);
            if (count < 0)
                return -1;
            sum += count;
            count = xmlOutputBufferWriteString(writer->out, ">");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    if (writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        sum += count;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterFullEndElement:
 * @writer:  the xmlTextWriterPtr
 *
 * End the current xml element. Writes an end tag even if the element is empty
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterFullEndElement(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    lk = xmlListFront(writer->nodes);
    if (lk == 0)
        return -1;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    sum = 0;
    switch (p->state) {
        case XML_TEXTWRITER_ATTRIBUTE:
            count = xmlTextWriterEndAttribute(writer);
            if (count < 0)
                return -1;
            sum += count;
            /* fallthrough */
        case XML_TEXTWRITER_NAME:
            /* Output namespace declarations */
            count = xmlTextWriterOutputNSDecl(writer);
            if (count < 0)
                return -1;
            sum += count;

            count = xmlOutputBufferWriteString(writer->out, ">");
            if (count < 0)
                return -1;
            sum += count;
            if (writer->indent)
                writer->doindent = 0;
            /* fallthrough */
        case XML_TEXTWRITER_TEXT:
            if ((writer->indent) && (writer->doindent)) {
                count = xmlTextWriterWriteIndent(writer);
                sum += count;
                writer->doindent = 1;
            } else
                writer->doindent = 1;
            count = xmlOutputBufferWriteString(writer->out, "</");
            if (count < 0)
                return -1;
            sum += count;
            count = xmlOutputBufferWriteString(writer->out,
                                               (const char *) p->name);
            if (count < 0)
                return -1;
            sum += count;
            count = xmlOutputBufferWriteString(writer->out, ">");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    if (writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        sum += count;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterWriteFormatRaw:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted raw xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatRaw(xmlTextWriterPtr writer, const char *format,
                            ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatRaw(writer, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatRaw:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted raw xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatRaw(xmlTextWriterPtr writer, const char *format,
                             va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteRaw(writer, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteRawLen:
 * @writer:  the xmlTextWriterPtr
 * @content:  text string
 * @len:  length of the text string
 *
 * Write an xml text.
 * TODO: what about entities and special chars??
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteRawLen(xmlTextWriterPtr writer, const xmlChar * content,
                         int len)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterWriteRawLen : invalid writer!\n");
        return -1;
    }

    if ((content == NULL) || (len < 0)) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterWriteRawLen : invalid content!\n");
        return -1;
    }

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        count = xmlTextWriterHandleStateDependencies(writer, p);
        if (count < 0)
            return -1;
        sum += count;
    }

    if (writer->indent)
        writer->doindent = 0;

    if (content != NULL) {
        count =
            xmlOutputBufferWrite(writer->out, len, (const char *) content);
        if (count < 0)
            return -1;
        sum += count;
    }

    return sum;
}

/**
 * xmlTextWriterWriteRaw:
 * @writer:  the xmlTextWriterPtr
 * @content:  text string
 *
 * Write a raw xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteRaw(xmlTextWriterPtr writer, const xmlChar * content)
{
    return xmlTextWriterWriteRawLen(writer, content, xmlStrlen(content));
}

/**
 * xmlTextWriterWriteFormatString:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatString(xmlTextWriterPtr writer, const char *format,
                               ...)
{
    int rc;
    va_list ap;

    if ((writer == NULL) || (format == NULL))
        return -1;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatString(writer, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatString:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatString(xmlTextWriterPtr writer,
                                const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if ((writer == NULL) || (format == NULL))
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteString(writer, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteString:
 * @writer:  the xmlTextWriterPtr
 * @content:  text string
 *
 * Write an xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteString(xmlTextWriterPtr writer, const xmlChar * content)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;
    xmlChar *buf;

    if ((writer == NULL) || (content == NULL))
        return -1;

    sum = 0;
    buf = (xmlChar *) content;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            switch (p->state) {
                case XML_TEXTWRITER_NAME:
                case XML_TEXTWRITER_TEXT:
#if 0
                    buf = NULL;
                    xmlOutputBufferWriteEscape(writer->out, content, NULL);
#endif
                    buf = xmlEncodeSpecialChars(NULL, content);
                    break;
                case XML_TEXTWRITER_ATTRIBUTE:
                    buf = NULL;
                    xmlAttrSerializeTxtContent(writer->out->buffer, writer->doc,
                                               NULL, content);
                    break;
                default:
                    break;
            }
        }
    }

    if (buf != NULL) {
        count = xmlTextWriterWriteRaw(writer, buf);

        if (buf != content)     /* buf was allocated by us, so free it */
            xmlFree(buf);

        if (count < 0)
            return -1;
        sum += count;
    }

    return sum;
}

/**
 * xmlOutputBufferWriteBase64:
 * @out: the xmlOutputBufferPtr
 * @data:   binary data
 * @len:  the number of bytes to encode
 *
 * Write base64 encoded data to an xmlOutputBuffer.
 * Adapted from John Walker's base64.c (http://www.fourmilab.ch/).
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
static int
xmlOutputBufferWriteBase64(xmlOutputBufferPtr out, int len,
                           const unsigned char *data)
{
    static unsigned char dtable[64] =
            {'A','B','C','D','E','F','G','H','I','J','K','L','M',
             'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
             'a','b','c','d','e','f','g','h','i','j','k','l','m',
             'n','o','p','q','r','s','t','u','v','w','x','y','z',
             '0','1','2','3','4','5','6','7','8','9','+','/'};

    int i;
    int linelen;
    int count;
    int sum;

    if ((out == NULL) || (len < 0) || (data == NULL))
        return(-1);

    linelen = 0;
    sum = 0;

    i = 0;
    while (1) {
        unsigned char igroup[3];
        unsigned char ogroup[4];
        int c;
        int n;

        igroup[0] = igroup[1] = igroup[2] = 0;
        for (n = 0; n < 3 && i < len; n++, i++) {
            c = data[i];
            igroup[n] = (unsigned char) c;
        }

        if (n > 0) {
            ogroup[0] = dtable[igroup[0] >> 2];
            ogroup[1] = dtable[((igroup[0] & 3) << 4) | (igroup[1] >> 4)];
            ogroup[2] =
                dtable[((igroup[1] & 0xF) << 2) | (igroup[2] >> 6)];
            ogroup[3] = dtable[igroup[2] & 0x3F];

            if (n < 3) {
                ogroup[3] = '=';
                if (n < 2) {
                    ogroup[2] = '=';
                }
            }

            if (linelen >= B64LINELEN) {
                count = xmlOutputBufferWrite(out, 2, B64CRLF);
                if (count == -1)
                    return -1;
                sum += count;
                linelen = 0;
            }
            count = xmlOutputBufferWrite(out, 4, (const char *) ogroup);
            if (count == -1)
                return -1;
            sum += count;

            linelen += 4;
        }

        if (i >= len)
            break;
    }

    return sum;
}

/**
 * xmlTextWriterWriteBase64:
 * @writer: the xmlTextWriterPtr
 * @data:   binary data
 * @start:  the position within the data of the first byte to encode
 * @len:  the number of bytes to encode
 *
 * Write an base64 encoded xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteBase64(xmlTextWriterPtr writer, const char *data,
                         int start, int len)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if ((writer == NULL) || (data == NULL) || (start < 0) || (len < 0))
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            count = xmlTextWriterHandleStateDependencies(writer, p);
            if (count < 0)
                return -1;
            sum += count;
        }
    }

    if (writer->indent)
        writer->doindent = 0;

    count =
        xmlOutputBufferWriteBase64(writer->out, len,
                                   (unsigned char *) data + start);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlOutputBufferWriteBinHex:
 * @out: the xmlOutputBufferPtr
 * @data:   binary data
 * @len:  the number of bytes to encode
 *
 * Write hqx encoded data to an xmlOutputBuffer.
 * ::todo
 *
 * Returns the bytes written (may be 0 because of buffering) 
 * or -1 in case of error
 */
static int
xmlOutputBufferWriteBinHex(xmlOutputBufferPtr out,
                           int len, const unsigned char *data)
{
    int count;
    int sum;
    static char hex[16] = 
        {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
    int i;

    if ((out == NULL) || (data == NULL) || (len < 0)) {
        return -1;
    }

    sum = 0;
    for (i = 0; i < len; i++) {
        count =
            xmlOutputBufferWrite(out, 1,
                                 (const char *) &hex[data[i] >> 4]);
        if (count == -1)
            return -1;
        sum += count;
        count =
            xmlOutputBufferWrite(out, 1,
                                 (const char *) &hex[data[i] & 0xF]);
        if (count == -1)
            return -1;
        sum += count;
    }

    return sum;
}

/**
 * xmlTextWriterWriteBinHex:
 * @writer: the xmlTextWriterPtr
 * @data:   binary data
 * @start:  the position within the data of the first byte to encode
 * @len:  the number of bytes to encode
 *
 * Write a BinHex encoded xml text.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteBinHex(xmlTextWriterPtr writer, const char *data,
                         int start, int len)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if ((writer == NULL) || (data == NULL) || (start < 0) || (len < 0))
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            count = xmlTextWriterHandleStateDependencies(writer, p);
            if (count < 0)
                return -1;
            sum += count;
        }
    }

    if (writer->indent)
        writer->doindent = 0;

    count =
        xmlOutputBufferWriteBinHex(writer->out, len,
                                   (unsigned char *) data + start);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartAttribute:
 * @writer:  the xmlTextWriterPtr
 * @name:  element name
 *
 * Start an xml attribute.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartAttribute(xmlTextWriterPtr writer, const xmlChar * name)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if ((writer == NULL) || (name == NULL) || (*name == '\0'))
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0)
        return -1;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    switch (p->state) {
        case XML_TEXTWRITER_ATTRIBUTE:
            count = xmlTextWriterEndAttribute(writer);
            if (count < 0)
                return -1;
            sum += count;
            /* fallthrough */
        case XML_TEXTWRITER_NAME:
            count = xmlOutputBufferWriteString(writer->out, " ");
            if (count < 0)
                return -1;
            sum += count;
            count =
                xmlOutputBufferWriteString(writer->out,
                                           (const char *) name);
            if (count < 0)
                return -1;
            sum += count;
            count = xmlOutputBufferWriteString(writer->out, "=");
            if (count < 0)
                return -1;
            sum += count;
            count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
            if (count < 0)
                return -1;
            sum += count;
            p->state = XML_TEXTWRITER_ATTRIBUTE;
            break;
        default:
            return -1;
    }

    return sum;
}

/**
 * xmlTextWriterStartAttributeNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix or NULL
 * @name:  element local name
 * @namespaceURI:  namespace URI or NULL
 *
 * Start an xml attribute with namespace support.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartAttributeNS(xmlTextWriterPtr writer,
                              const xmlChar * prefix, const xmlChar * name,
                              const xmlChar * namespaceURI)
{
    int count;
    int sum;
    xmlChar *buf;
    xmlTextWriterNsStackEntry *p;

    if ((writer == NULL) || (name == NULL) || (*name == '\0'))
        return -1;

    /* Handle namespace first in case of error */
    if (namespaceURI != 0) {
        xmlTextWriterNsStackEntry nsentry, *curns;

        buf = xmlStrdup(BAD_CAST "xmlns");
        if (prefix != 0) {
            buf = xmlStrcat(buf, BAD_CAST ":");
            buf = xmlStrcat(buf, prefix);
        }

        nsentry.prefix = buf;
        nsentry.uri = (xmlChar *)namespaceURI;
        nsentry.elem = xmlListFront(writer->nodes);

        curns = (xmlTextWriterNsStackEntry *)xmlListSearch(writer->nsstack, 
                                                           (void *)&nsentry);
        if ((curns != NULL)) {
            xmlFree(buf);
            if (xmlStrcmp(curns->uri, namespaceURI) == 0) {
                /* Namespace already defined on element skip */
                buf = NULL;
            } else {
                /* Prefix mismatch so error out */
                return -1;
            }
        }

        /* Do not add namespace decl to list - it is already there */
        if (buf != NULL) {
            p = (xmlTextWriterNsStackEntry *)
                xmlMalloc(sizeof(xmlTextWriterNsStackEntry));
            if (p == 0) {
                xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                                                                        "xmlTextWriterStartAttributeNS : out of memory!\n");
                return -1;
            }

            p->prefix = buf;
            p->uri = xmlStrdup(namespaceURI);
            if (p->uri == 0) {
                xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartAttributeNS : out of memory!\n");
                xmlFree(p);
                return -1;
            }
            p->elem = xmlListFront(writer->nodes);

            xmlListPushFront(writer->nsstack, p);
        }
    }

    buf = NULL;
    if (prefix != 0) {
        buf = xmlStrdup(prefix);
        buf = xmlStrcat(buf, BAD_CAST ":");
    }
    buf = xmlStrcat(buf, name);

    sum = 0;
    count = xmlTextWriterStartAttribute(writer, buf);
    xmlFree(buf);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndAttribute:
 * @writer:  the xmlTextWriterPtr
 *
 * End the current xml element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndAttribute(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    lk = xmlListFront(writer->nodes);
    if (lk == 0) {
        return -1;
    }

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0) {
        return -1;
    }

    sum = 0;
    switch (p->state) {
        case XML_TEXTWRITER_ATTRIBUTE:
            p->state = XML_TEXTWRITER_NAME;

            count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
            if (count < 0) {
                return -1;
            }
            sum += count;
            break;
        default:
            return -1;
    }

    return sum;
}

/**
 * xmlTextWriterWriteFormatAttribute:
 * @writer:  the xmlTextWriterPtr
 * @name:  attribute name
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted xml attribute.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatAttribute(xmlTextWriterPtr writer,
                                  const xmlChar * name, const char *format,
                                  ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatAttribute(writer, name, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatAttribute:
 * @writer:  the xmlTextWriterPtr
 * @name:  attribute name
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted xml attribute.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatAttribute(xmlTextWriterPtr writer,
                                   const xmlChar * name,
                                   const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteAttribute(writer, name, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteAttribute:
 * @writer:  the xmlTextWriterPtr
 * @name:  attribute name
 * @content:  attribute content
 *
 * Write an xml attribute.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteAttribute(xmlTextWriterPtr writer, const xmlChar * name,
                            const xmlChar * content)
{
    int count;
    int sum;

    sum = 0;
    count = xmlTextWriterStartAttribute(writer, name);
    if (count < 0)
        return -1;
    sum += count;
    count = xmlTextWriterWriteString(writer, content);
    if (count < 0)
        return -1;
    sum += count;
    count = xmlTextWriterEndAttribute(writer);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterWriteFormatAttributeNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix
 * @name:  attribute local name
 * @namespaceURI:  namespace URI
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted xml attribute.with namespace support
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatAttributeNS(xmlTextWriterPtr writer,
                                    const xmlChar * prefix,
                                    const xmlChar * name,
                                    const xmlChar * namespaceURI,
                                    const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatAttributeNS(writer, prefix, name,
                                              namespaceURI, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatAttributeNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix
 * @name:  attribute local name
 * @namespaceURI:  namespace URI
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted xml attribute.with namespace support
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatAttributeNS(xmlTextWriterPtr writer,
                                     const xmlChar * prefix,
                                     const xmlChar * name,
                                     const xmlChar * namespaceURI,
                                     const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteAttributeNS(writer, prefix, name, namespaceURI,
                                       buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteAttributeNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix
 * @name:  attribute local name
 * @namespaceURI:  namespace URI
 * @content:  attribute content
 *
 * Write an xml attribute.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteAttributeNS(xmlTextWriterPtr writer,
                              const xmlChar * prefix, const xmlChar * name,
                              const xmlChar * namespaceURI,
                              const xmlChar * content)
{
    int count;
    int sum;

    if ((writer == NULL) || (name == NULL) || (*name == '\0'))
        return -1;

    sum = 0;
    count = xmlTextWriterStartAttributeNS(writer, prefix, name, namespaceURI);
    if (count < 0)
        return -1;
    sum += count;
    count = xmlTextWriterWriteString(writer, content);
    if (count < 0)
        return -1;
    sum += count;
    count = xmlTextWriterEndAttribute(writer);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterWriteFormatElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  element name
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted xml element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatElement(xmlTextWriterPtr writer,
                                const xmlChar * name, const char *format,
                                ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatElement(writer, name, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  element name
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted xml element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatElement(xmlTextWriterPtr writer,
                                 const xmlChar * name, const char *format,
                                 va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteElement(writer, name, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  element name
 * @content:  element content
 *
 * Write an xml element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteElement(xmlTextWriterPtr writer, const xmlChar * name,
                          const xmlChar * content)
{
    int count;
    int sum;

    sum = 0;
    count = xmlTextWriterStartElement(writer, name);
    if (count == -1)
        return -1;
    sum += count;
    count = xmlTextWriterWriteString(writer, content);
    if (count == -1)
        return -1;
    sum += count;
    count = xmlTextWriterEndElement(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterWriteFormatElementNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix
 * @name:  element local name
 * @namespaceURI:  namespace URI
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted xml element with namespace support.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatElementNS(xmlTextWriterPtr writer,
                                  const xmlChar * prefix,
                                  const xmlChar * name,
                                  const xmlChar * namespaceURI,
                                  const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatElementNS(writer, prefix, name,
                                            namespaceURI, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatElementNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix
 * @name:  element local name
 * @namespaceURI:  namespace URI
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted xml element with namespace support.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatElementNS(xmlTextWriterPtr writer,
                                   const xmlChar * prefix,
                                   const xmlChar * name,
                                   const xmlChar * namespaceURI,
                                   const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteElementNS(writer, prefix, name, namespaceURI,
                                     buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteElementNS:
 * @writer:  the xmlTextWriterPtr
 * @prefix:  namespace prefix
 * @name:  element local name
 * @namespaceURI:  namespace URI
 * @content:  element content
 *
 * Write an xml element with namespace support.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteElementNS(xmlTextWriterPtr writer,
                            const xmlChar * prefix, const xmlChar * name,
                            const xmlChar * namespaceURI,
                            const xmlChar * content)
{
    int count;
    int sum;

    if ((writer == NULL) || (name == NULL) || (*name == '\0'))
        return -1;

    sum = 0;
    count =
        xmlTextWriterStartElementNS(writer, prefix, name, namespaceURI);
    if (count < 0)
        return -1;
    sum += count;
    count = xmlTextWriterWriteString(writer, content);
    if (count == -1)
        return -1;
    sum += count;
    count = xmlTextWriterEndElement(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartPI:
 * @writer:  the xmlTextWriterPtr
 * @target:  PI target
 *
 * Start an xml PI.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartPI(xmlTextWriterPtr writer, const xmlChar * target)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if ((writer == NULL) || (target == NULL) || (*target == '\0'))
        return -1;

    if (xmlStrcasecmp(target, (const xmlChar *) "xml") == 0) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterStartPI : target name [Xx][Mm][Ll] is reserved for xml standardization!\n");
        return -1;
    }

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            switch (p->state) {
                case XML_TEXTWRITER_ATTRIBUTE:
                    count = xmlTextWriterEndAttribute(writer);
                    if (count < 0)
                        return -1;
                    sum += count;
                    /* fallthrough */
                case XML_TEXTWRITER_NAME:
                    /* Output namespace declarations */
                    count = xmlTextWriterOutputNSDecl(writer);
                    if (count < 0)
                        return -1;
                    sum += count;
                    count = xmlOutputBufferWriteString(writer->out, ">");
                    if (count < 0)
                        return -1;
                    sum += count;
                    p->state = XML_TEXTWRITER_TEXT;
                    break;
                case XML_TEXTWRITER_NONE:
                case XML_TEXTWRITER_TEXT:
                case XML_TEXTWRITER_DTD:
                    break;
                case XML_TEXTWRITER_PI:
                case XML_TEXTWRITER_PI_TEXT:
                    xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                                    "xmlTextWriterStartPI : nested PI!\n");
                    return -1;
                default:
                    return -1;
            }
        }
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartPI : out of memory!\n");
        return -1;
    }

    p->name = xmlStrdup(target);
    if (p->name == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartPI : out of memory!\n");
        xmlFree(p);
        return -1;
    }
    p->state = XML_TEXTWRITER_PI;

    xmlListPushFront(writer->nodes, p);

    count = xmlOutputBufferWriteString(writer->out, "<?");
    if (count < 0)
        return -1;
    sum += count;
    count =
        xmlOutputBufferWriteString(writer->out, (const char *) p->name);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndPI:
 * @writer:  the xmlTextWriterPtr
 *
 * End the current xml PI.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndPI(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    lk = xmlListFront(writer->nodes);
    if (lk == 0)
        return 0;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return 0;

    sum = 0;
    switch (p->state) {
        case XML_TEXTWRITER_PI:
        case XML_TEXTWRITER_PI_TEXT:
            count = xmlOutputBufferWriteString(writer->out, "?>");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    if (writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        if (count < 0)
        return -1;
        sum += count;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterWriteFormatPI:
 * @writer:  the xmlTextWriterPtr
 * @target:  PI target
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted PI.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatPI(xmlTextWriterPtr writer, const xmlChar * target,
                           const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatPI(writer, target, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatPI:
 * @writer:  the xmlTextWriterPtr
 * @target:  PI target
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted xml PI.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatPI(xmlTextWriterPtr writer,
                            const xmlChar * target, const char *format,
                            va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWritePI(writer, target, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWritePI:
 * @writer:  the xmlTextWriterPtr
 * @target:  PI target
 * @content:  PI content
 *
 * Write an xml PI.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWritePI(xmlTextWriterPtr writer, const xmlChar * target,
                     const xmlChar * content)
{
    int count;
    int sum;

    sum = 0;
    count = xmlTextWriterStartPI(writer, target);
    if (count == -1)
        return -1;
    sum += count;
    if (content != 0) {
        count = xmlTextWriterWriteString(writer, content);
        if (count == -1)
            return -1;
        sum += count;
    }
    count = xmlTextWriterEndPI(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartCDATA:
 * @writer:  the xmlTextWriterPtr
 *
 * Start an xml CDATA section.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartCDATA(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            switch (p->state) {
                case XML_TEXTWRITER_NONE:
                case XML_TEXTWRITER_TEXT:
                case XML_TEXTWRITER_PI:
                case XML_TEXTWRITER_PI_TEXT:
                    break;
                case XML_TEXTWRITER_ATTRIBUTE:
                    count = xmlTextWriterEndAttribute(writer);
                    if (count < 0)
                        return -1;
                    sum += count;
                    /* fallthrough */
                case XML_TEXTWRITER_NAME:
                    /* Output namespace declarations */
                    count = xmlTextWriterOutputNSDecl(writer);
                    if (count < 0)
                        return -1;
                    sum += count;
                    count = xmlOutputBufferWriteString(writer->out, ">");
                    if (count < 0)
                        return -1;
                    sum += count;
                    p->state = XML_TEXTWRITER_TEXT;
                    break;
                case XML_TEXTWRITER_CDATA:
                    xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                                    "xmlTextWriterStartCDATA : CDATA not allowed in this context!\n");
                    return -1;
                default:
                    return -1;
            }
        }
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartCDATA : out of memory!\n");
        return -1;
    }

    p->name = NULL;
    p->state = XML_TEXTWRITER_CDATA;

    xmlListPushFront(writer->nodes, p);

    count = xmlOutputBufferWriteString(writer->out, "<![CDATA[");
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndCDATA:
 * @writer:  the xmlTextWriterPtr
 *
 * End an xml CDATA section.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndCDATA(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    lk = xmlListFront(writer->nodes);
    if (lk == 0)
        return -1;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    sum = 0;
    switch (p->state) {
        case XML_TEXTWRITER_CDATA:
            count = xmlOutputBufferWriteString(writer->out, "]]>");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterWriteFormatCDATA:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted xml CDATA.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatCDATA(xmlTextWriterPtr writer, const char *format,
                              ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatCDATA(writer, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatCDATA:
 * @writer:  the xmlTextWriterPtr
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted xml CDATA.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatCDATA(xmlTextWriterPtr writer, const char *format,
                               va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteCDATA(writer, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteCDATA:
 * @writer:  the xmlTextWriterPtr
 * @content:  CDATA content
 *
 * Write an xml CDATA.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteCDATA(xmlTextWriterPtr writer, const xmlChar * content)
{
    int count;
    int sum;

    sum = 0;
    count = xmlTextWriterStartCDATA(writer);
    if (count == -1)
        return -1;
    sum += count;
    if (content != 0) {
        count = xmlTextWriterWriteString(writer, content);
        if (count == -1)
            return -1;
        sum += count;
    }
    count = xmlTextWriterEndCDATA(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartDTD:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 *
 * Start an xml DTD.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartDTD(xmlTextWriterPtr writer,
                      const xmlChar * name,
                      const xmlChar * pubid, const xmlChar * sysid)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL || name == NULL || *name == '\0')
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if ((lk != NULL) && (xmlLinkGetData(lk) != NULL)) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterStartDTD : DTD allowed only in prolog!\n");
        return -1;
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTD : out of memory!\n");
        return -1;
    }

    p->name = xmlStrdup(name);
    if (p->name == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTD : out of memory!\n");
        xmlFree(p);
        return -1;
    }
    p->state = XML_TEXTWRITER_DTD;

    xmlListPushFront(writer->nodes, p);

    count = xmlOutputBufferWriteString(writer->out, "<!DOCTYPE ");
    if (count < 0)
        return -1;
    sum += count;
    count = xmlOutputBufferWriteString(writer->out, (const char *) name);
    if (count < 0)
        return -1;
    sum += count;

    if (pubid != 0) {
        if (sysid == 0) {
            xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                            "xmlTextWriterStartDTD : system identifier needed!\n");
            return -1;
        }

        if (writer->indent)
            count = xmlOutputBufferWrite(writer->out, 1, "\n");
        else
            count = xmlOutputBufferWrite(writer->out, 1, " ");
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWriteString(writer->out, "PUBLIC ");
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;

        count =
            xmlOutputBufferWriteString(writer->out, (const char *) pubid);
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    if (sysid != 0) {
        if (pubid == 0) {
            if (writer->indent)
                count = xmlOutputBufferWrite(writer->out, 1, "\n");
            else
                count = xmlOutputBufferWrite(writer->out, 1, " ");
            if (count < 0)
                return -1;
            sum += count;
            count = xmlOutputBufferWriteString(writer->out, "SYSTEM ");
            if (count < 0)
                return -1;
            sum += count;
        } else {
                        if (writer->indent)
            count = xmlOutputBufferWriteString(writer->out, "\n       ");
            else
                count = xmlOutputBufferWrite(writer->out, 1, " ");
            if (count < 0)
                return -1;
            sum += count;
        }

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;

        count =
            xmlOutputBufferWriteString(writer->out, (const char *) sysid);
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    return sum;
}

/**
 * xmlTextWriterEndDTD:
 * @writer:  the xmlTextWriterPtr
 *
 * End an xml DTD.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndDTD(xmlTextWriterPtr writer)
{
    int loop;
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    sum = 0;
    loop = 1;
    while (loop) {
        lk = xmlListFront(writer->nodes);
        if (lk == NULL)
            break;
        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p == 0)
            break;
        switch (p->state) {
            case XML_TEXTWRITER_DTD_TEXT:
                count = xmlOutputBufferWriteString(writer->out, "]");
                if (count < 0)
                    return -1;
                sum += count;
                /* fallthrough */
            case XML_TEXTWRITER_DTD:
                count = xmlOutputBufferWriteString(writer->out, ">");

                if (writer->indent) {
                    if (count < 0)
                        return -1;
                    sum += count;
                    count = xmlOutputBufferWriteString(writer->out, "\n");
                }

                xmlListPopFront(writer->nodes);
                break;
            case XML_TEXTWRITER_DTD_ELEM:
            case XML_TEXTWRITER_DTD_ELEM_TEXT:
                count = xmlTextWriterEndDTDElement(writer);
                break;
            case XML_TEXTWRITER_DTD_ATTL:
            case XML_TEXTWRITER_DTD_ATTL_TEXT:
                count = xmlTextWriterEndDTDAttlist(writer);
                break;
            case XML_TEXTWRITER_DTD_ENTY:
            case XML_TEXTWRITER_DTD_PENT:
            case XML_TEXTWRITER_DTD_ENTY_TEXT:
                count = xmlTextWriterEndDTDEntity(writer);
                break;
            case XML_TEXTWRITER_COMMENT:
                count = xmlTextWriterEndComment(writer);
                break;
            default:
                loop = 0;
                continue;
        }

        if (count < 0)
            return -1;
        sum += count;
    }

    return sum;
}

/**
 * xmlTextWriterWriteFormatDTD:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a DTD with a formatted markup declarations part.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatDTD(xmlTextWriterPtr writer,
                            const xmlChar * name,
                            const xmlChar * pubid,
                            const xmlChar * sysid, const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatDTD(writer, name, pubid, sysid, format,
                                      ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatDTD:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a DTD with a formatted markup declarations part.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatDTD(xmlTextWriterPtr writer,
                             const xmlChar * name,
                             const xmlChar * pubid,
                             const xmlChar * sysid,
                             const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteDTD(writer, name, pubid, sysid, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteDTD:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 * @subset:  string content of the DTD
 *
 * Write a DTD.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTD(xmlTextWriterPtr writer,
                      const xmlChar * name,
                      const xmlChar * pubid,
                      const xmlChar * sysid, const xmlChar * subset)
{
    int count;
    int sum;

    sum = 0;
    count = xmlTextWriterStartDTD(writer, name, pubid, sysid);
    if (count == -1)
        return -1;
    sum += count;
    if (subset != 0) {
        count = xmlTextWriterWriteString(writer, subset);
        if (count == -1)
            return -1;
        sum += count;
    }
    count = xmlTextWriterEndDTD(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartDTDElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD element
 *
 * Start an xml DTD element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartDTDElement(xmlTextWriterPtr writer, const xmlChar * name)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL || name == NULL || *name == '\0')
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0) {
        return -1;
    }

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p != 0) {
        switch (p->state) {
            case XML_TEXTWRITER_DTD:
                count = xmlOutputBufferWriteString(writer->out, " [");
                if (count < 0)
                    return -1;
                sum += count;
                if (writer->indent) {
                    count = xmlOutputBufferWriteString(writer->out, "\n");
                    if (count < 0)
                        return -1;
                    sum += count;
                }
                p->state = XML_TEXTWRITER_DTD_TEXT;
                /* fallthrough */
            case XML_TEXTWRITER_DTD_TEXT:
            case XML_TEXTWRITER_NONE:
                break;
            default:
                return -1;
        }
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTDElement : out of memory!\n");
        return -1;
    }

    p->name = xmlStrdup(name);
    if (p->name == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTDElement : out of memory!\n");
        xmlFree(p);
        return -1;
    }
    p->state = XML_TEXTWRITER_DTD_ELEM;

    xmlListPushFront(writer->nodes, p);

    if (writer->indent) {
        count = xmlTextWriterWriteIndent(writer);
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, "<!ELEMENT ");
    if (count < 0)
        return -1;
    sum += count;
    count = xmlOutputBufferWriteString(writer->out, (const char *) name);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndDTDElement:
 * @writer:  the xmlTextWriterPtr
 *
 * End an xml DTD element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndDTDElement(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0)
        return -1;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    switch (p->state) {
        case XML_TEXTWRITER_DTD_ELEM:
        case XML_TEXTWRITER_DTD_ELEM_TEXT:
            count = xmlOutputBufferWriteString(writer->out, ">");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    if (writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        if (count < 0)
            return -1;
        sum += count;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterWriteFormatDTDElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD element
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted DTD element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatDTDElement(xmlTextWriterPtr writer,
                                   const xmlChar * name,
                                   const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatDTDElement(writer, name, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatDTDElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD element
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted DTD element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatDTDElement(xmlTextWriterPtr writer,
                                    const xmlChar * name,
                                    const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteDTDElement(writer, name, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteDTDElement:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD element
 * @content:  content of the element
 *
 * Write a DTD element.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTDElement(xmlTextWriterPtr writer,
                             const xmlChar * name, const xmlChar * content)
{
    int count;
    int sum;

    if (content == NULL)
        return -1;

    sum = 0;
    count = xmlTextWriterStartDTDElement(writer, name);
    if (count == -1)
        return -1;
    sum += count;

    count = xmlTextWriterWriteString(writer, content);
    if (count == -1)
        return -1;
    sum += count;

    count = xmlTextWriterEndDTDElement(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartDTDAttlist:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD ATTLIST
 *
 * Start an xml DTD ATTLIST.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartDTDAttlist(xmlTextWriterPtr writer, const xmlChar * name)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL || name == NULL || *name == '\0')
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0) {
        return -1;
    }

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p != 0) {
        switch (p->state) {
            case XML_TEXTWRITER_DTD:
                count = xmlOutputBufferWriteString(writer->out, " [");
                if (count < 0)
                    return -1;
                sum += count;
                if (writer->indent) {
                    count = xmlOutputBufferWriteString(writer->out, "\n");
                    if (count < 0)
                        return -1;
                    sum += count;
                }
                p->state = XML_TEXTWRITER_DTD_TEXT;
                /* fallthrough */
            case XML_TEXTWRITER_DTD_TEXT:
            case XML_TEXTWRITER_NONE:
                break;
            default:
                return -1;
        }
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTDAttlist : out of memory!\n");
        return -1;
    }

    p->name = xmlStrdup(name);
    if (p->name == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTDAttlist : out of memory!\n");
        xmlFree(p);
        return -1;
    }
    p->state = XML_TEXTWRITER_DTD_ATTL;

    xmlListPushFront(writer->nodes, p);

    if (writer->indent) {
        count = xmlTextWriterWriteIndent(writer);
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, "<!ATTLIST ");
    if (count < 0)
        return -1;
    sum += count;
    count = xmlOutputBufferWriteString(writer->out, (const char *) name);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndDTDAttlist:
 * @writer:  the xmlTextWriterPtr
 *
 * End an xml DTD attribute list.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndDTDAttlist(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0)
        return -1;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    switch (p->state) {
        case XML_TEXTWRITER_DTD_ATTL:
        case XML_TEXTWRITER_DTD_ATTL_TEXT:
            count = xmlOutputBufferWriteString(writer->out, ">");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    if (writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        if (count < 0)
            return -1;
        sum += count;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterWriteFormatDTDAttlist:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD ATTLIST
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted DTD ATTLIST.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatDTDAttlist(xmlTextWriterPtr writer,
                                   const xmlChar * name,
                                   const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatDTDAttlist(writer, name, format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatDTDAttlist:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD ATTLIST
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted DTD ATTLIST.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatDTDAttlist(xmlTextWriterPtr writer,
                                    const xmlChar * name,
                                    const char *format, va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteDTDAttlist(writer, name, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteDTDAttlist:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the DTD ATTLIST
 * @content:  content of the ATTLIST
 *
 * Write a DTD ATTLIST.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTDAttlist(xmlTextWriterPtr writer,
                             const xmlChar * name, const xmlChar * content)
{
    int count;
    int sum;

    if (content == NULL)
        return -1;

    sum = 0;
    count = xmlTextWriterStartDTDAttlist(writer, name);
    if (count == -1)
        return -1;
    sum += count;

    count = xmlTextWriterWriteString(writer, content);
    if (count == -1)
        return -1;
    sum += count;

    count = xmlTextWriterEndDTDAttlist(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterStartDTDEntity:
 * @writer:  the xmlTextWriterPtr
 * @pe:  TRUE if this is a parameter entity, FALSE if not
 * @name:  the name of the DTD ATTLIST
 *
 * Start an xml DTD ATTLIST.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterStartDTDEntity(xmlTextWriterPtr writer,
                            int pe, const xmlChar * name)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL || name == NULL || *name == '\0')
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk != 0) {

        p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
        if (p != 0) {
            switch (p->state) {
                case XML_TEXTWRITER_DTD:
                    count = xmlOutputBufferWriteString(writer->out, " [");
                    if (count < 0)
                        return -1;
                    sum += count;
                    if (writer->indent) {
                        count =
                            xmlOutputBufferWriteString(writer->out, "\n");
                        if (count < 0)
                            return -1;
                        sum += count;
                    }
                    p->state = XML_TEXTWRITER_DTD_TEXT;
                    /* fallthrough */
                case XML_TEXTWRITER_DTD_TEXT:
                case XML_TEXTWRITER_NONE:
                    break;
                default:
                    return -1;
            }
        }
    }

    p = (xmlTextWriterStackEntry *)
        xmlMalloc(sizeof(xmlTextWriterStackEntry));
    if (p == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTDElement : out of memory!\n");
        return -1;
    }

    p->name = xmlStrdup(name);
    if (p->name == 0) {
        xmlWriterErrMsg(writer, XML_ERR_NO_MEMORY,
                        "xmlTextWriterStartDTDElement : out of memory!\n");
        xmlFree(p);
        return -1;
    }

    if (pe != 0)
        p->state = XML_TEXTWRITER_DTD_PENT;
    else
        p->state = XML_TEXTWRITER_DTD_ENTY;

    xmlListPushFront(writer->nodes, p);

    if (writer->indent) {
        count = xmlTextWriterWriteIndent(writer);
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, "<!ENTITY ");
    if (count < 0)
        return -1;
    sum += count;

    if (pe != 0) {
        count = xmlOutputBufferWriteString(writer->out, "% ");
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, (const char *) name);
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterEndDTDEntity:
 * @writer:  the xmlTextWriterPtr
 *
 * End an xml DTD entity.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterEndDTDEntity(xmlTextWriterPtr writer)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL)
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0)
        return -1;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    switch (p->state) {
        case XML_TEXTWRITER_DTD_ENTY_TEXT:
            count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
            if (count < 0)
                return -1;
            sum += count;
        case XML_TEXTWRITER_DTD_ENTY:
        case XML_TEXTWRITER_DTD_PENT:
            count = xmlOutputBufferWriteString(writer->out, ">");
            if (count < 0)
                return -1;
            sum += count;
            break;
        default:
            return -1;
    }

    if (writer->indent) {
        count = xmlOutputBufferWriteString(writer->out, "\n");
        if (count < 0)
            return -1;
        sum += count;
    }

    xmlListPopFront(writer->nodes);
    return sum;
}

/**
 * xmlTextWriterWriteFormatDTDInternalEntity:
 * @writer:  the xmlTextWriterPtr
 * @pe:  TRUE if this is a parameter entity, FALSE if not
 * @name:  the name of the DTD entity
 * @format:  format string (see printf)
 * @...:  extra parameters for the format
 *
 * Write a formatted DTD internal entity.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int XMLCDECL
xmlTextWriterWriteFormatDTDInternalEntity(xmlTextWriterPtr writer,
                                          int pe,
                                          const xmlChar * name,
                                          const char *format, ...)
{
    int rc;
    va_list ap;

    va_start(ap, format);

    rc = xmlTextWriterWriteVFormatDTDInternalEntity(writer, pe, name,
                                                    format, ap);

    va_end(ap);
    return rc;
}

/**
 * xmlTextWriterWriteVFormatDTDInternalEntity:
 * @writer:  the xmlTextWriterPtr
 * @pe:  TRUE if this is a parameter entity, FALSE if not
 * @name:  the name of the DTD entity
 * @format:  format string (see printf)
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Write a formatted DTD internal entity.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteVFormatDTDInternalEntity(xmlTextWriterPtr writer,
                                           int pe,
                                           const xmlChar * name,
                                           const char *format,
                                           va_list argptr)
{
    int rc;
    xmlChar *buf;

    if (writer == NULL)
        return -1;

    buf = xmlTextWriterVSprintf(format, argptr);
    if (buf == NULL)
        return -1;

    rc = xmlTextWriterWriteDTDInternalEntity(writer, pe, name, buf);

    xmlFree(buf);
    return rc;
}

/**
 * xmlTextWriterWriteDTDEntity:
 * @writer:  the xmlTextWriterPtr
 * @pe:  TRUE if this is a parameter entity, FALSE if not
 * @name:  the name of the DTD entity
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 * @ndataid:  the xml notation name.
 * @content:  content of the entity
 *
 * Write a DTD entity.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTDEntity(xmlTextWriterPtr writer,
                            int pe,
                            const xmlChar * name,
                            const xmlChar * pubid,
                            const xmlChar * sysid,
                            const xmlChar * ndataid,
                            const xmlChar * content)
{
    if ((content == NULL) && (pubid == NULL) && (sysid == NULL))
        return -1;
    if ((pe != 0) && (ndataid != NULL))
        return -1;

    if ((pubid == NULL) && (sysid == NULL))
        return xmlTextWriterWriteDTDInternalEntity(writer, pe, name,
                                                   content);

    return xmlTextWriterWriteDTDExternalEntity(writer, pe, name, pubid,
                                               sysid, ndataid);
}

/**
 * xmlTextWriterWriteDTDInternalEntity:
 * @writer:  the xmlTextWriterPtr
 * @pe:  TRUE if this is a parameter entity, FALSE if not
 * @name:  the name of the DTD entity
 * @content:  content of the entity
 *
 * Write a DTD internal entity.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTDInternalEntity(xmlTextWriterPtr writer,
                                    int pe,
                                    const xmlChar * name,
                                    const xmlChar * content)
{
    int count;
    int sum;

    if ((name == NULL) || (*name == '\0') || (content == NULL))
        return -1;

    sum = 0;
    count = xmlTextWriterStartDTDEntity(writer, pe, name);
    if (count == -1)
        return -1;
    sum += count;

    count = xmlTextWriterWriteString(writer, content);
    if (count == -1)
        return -1;
    sum += count;

    count = xmlTextWriterEndDTDEntity(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterWriteDTDExternalEntity:
 * @writer:  the xmlTextWriterPtr
 * @pe:  TRUE if this is a parameter entity, FALSE if not
 * @name:  the name of the DTD entity
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 * @ndataid:  the xml notation name.
 *
 * Write a DTD external entity. The entity must have been started with xmlTextWriterStartDTDEntity
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTDExternalEntity(xmlTextWriterPtr writer,
                                    int pe,
                                    const xmlChar * name,
                                    const xmlChar * pubid,
                                    const xmlChar * sysid,
                                    const xmlChar * ndataid)
{
    int count;
    int sum;

    if (((pubid == NULL) && (sysid == NULL)))
        return -1;
    if ((pe != 0) && (ndataid != NULL))
        return -1;

    sum = 0;
    count = xmlTextWriterStartDTDEntity(writer, pe, name);
    if (count == -1)
        return -1;
    sum += count;

    count =
        xmlTextWriterWriteDTDExternalEntityContents(writer, pubid, sysid,
                                                    ndataid);
    if (count < 0)
        return -1;
    sum += count;

    count = xmlTextWriterEndDTDEntity(writer);
    if (count == -1)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterWriteDTDExternalEntityContents:
 * @writer:  the xmlTextWriterPtr
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 * @ndataid:  the xml notation name.
 *
 * Write the contents of a DTD external entity.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTDExternalEntityContents(xmlTextWriterPtr writer,
                                            const xmlChar * pubid,
                                            const xmlChar * sysid,
                                            const xmlChar * ndataid)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterWriteDTDExternalEntityContents: xmlTextWriterPtr invalid!\n");
        return -1;
    }

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0) {
        xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterWriteDTDExternalEntityContents: you must call xmlTextWriterStartDTDEntity before the call to this function!\n");
        return -1;
    }

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return -1;

    switch (p->state) {
        case XML_TEXTWRITER_DTD_ENTY:
            break;
        case XML_TEXTWRITER_DTD_PENT:
            if (ndataid != NULL) {
                xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                                "xmlTextWriterWriteDTDExternalEntityContents: notation not allowed with parameter entities!\n");
                return -1;
            }
            break;
        default:
            xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                            "xmlTextWriterWriteDTDExternalEntityContents: you must call xmlTextWriterStartDTDEntity before the call to this function!\n");
            return -1;
    }

    if (pubid != 0) {
        if (sysid == 0) {
            xmlWriterErrMsg(writer, XML_ERR_INTERNAL_ERROR,
                            "xmlTextWriterWriteDTDExternalEntityContents: system identifier needed!\n");
            return -1;
        }

        count = xmlOutputBufferWriteString(writer->out, " PUBLIC ");
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;

        count =
            xmlOutputBufferWriteString(writer->out, (const char *) pubid);
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    if (sysid != 0) {
        if (pubid == 0) {
            count = xmlOutputBufferWriteString(writer->out, " SYSTEM");
            if (count < 0)
                return -1;
            sum += count;
        }

        count = xmlOutputBufferWriteString(writer->out, " ");
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;

        count =
            xmlOutputBufferWriteString(writer->out, (const char *) sysid);
        if (count < 0)
            return -1;
        sum += count;

        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    if (ndataid != NULL) {
        count = xmlOutputBufferWriteString(writer->out, " NDATA ");
        if (count < 0)
            return -1;
        sum += count;

        count =
            xmlOutputBufferWriteString(writer->out,
                                       (const char *) ndataid);
        if (count < 0)
            return -1;
        sum += count;
    }

    return sum;
}

/**
 * xmlTextWriterWriteDTDNotation:
 * @writer:  the xmlTextWriterPtr
 * @name:  the name of the xml notation
 * @pubid:  the public identifier, which is an alternative to the system identifier
 * @sysid:  the system identifier, which is the URI of the DTD
 *
 * Write a DTD entity.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterWriteDTDNotation(xmlTextWriterPtr writer,
                              const xmlChar * name,
                              const xmlChar * pubid, const xmlChar * sysid)
{
    int count;
    int sum;
    xmlLinkPtr lk;
    xmlTextWriterStackEntry *p;

    if (writer == NULL || name == NULL || *name == '\0')
        return -1;

    sum = 0;
    lk = xmlListFront(writer->nodes);
    if (lk == 0) {
        return -1;
    }

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p != 0) {
        switch (p->state) {
            case XML_TEXTWRITER_DTD:
                count = xmlOutputBufferWriteString(writer->out, " [");
                if (count < 0)
                    return -1;
                sum += count;
                if (writer->indent) {
                    count = xmlOutputBufferWriteString(writer->out, "\n");
                    if (count < 0)
                        return -1;
                    sum += count;
                }
                p->state = XML_TEXTWRITER_DTD_TEXT;
                /* fallthrough */
            case XML_TEXTWRITER_DTD_TEXT:
                break;
            default:
                return -1;
        }
    }

    if (writer->indent) {
        count = xmlTextWriterWriteIndent(writer);
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, "<!NOTATION ");
    if (count < 0)
        return -1;
    sum += count;
    count = xmlOutputBufferWriteString(writer->out, (const char *) name);
    if (count < 0)
        return -1;
    sum += count;

    if (pubid != 0) {
        count = xmlOutputBufferWriteString(writer->out, " PUBLIC ");
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
        count =
            xmlOutputBufferWriteString(writer->out, (const char *) pubid);
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    if (sysid != 0) {
        if (pubid == 0) {
            count = xmlOutputBufferWriteString(writer->out, " SYSTEM");
            if (count < 0)
                return -1;
            sum += count;
        }
        count = xmlOutputBufferWriteString(writer->out, " ");
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
        count =
            xmlOutputBufferWriteString(writer->out, (const char *) sysid);
        if (count < 0)
            return -1;
        sum += count;
        count = xmlOutputBufferWrite(writer->out, 1, &writer->qchar);
        if (count < 0)
            return -1;
        sum += count;
    }

    count = xmlOutputBufferWriteString(writer->out, ">");
    if (count < 0)
        return -1;
    sum += count;

    return sum;
}

/**
 * xmlTextWriterFlush:
 * @writer:  the xmlTextWriterPtr
 *
 * Flush the output buffer.
 *
 * Returns the bytes written (may be 0 because of buffering) or -1 in case of error
 */
int
xmlTextWriterFlush(xmlTextWriterPtr writer)
{
    int count;

    if (writer == NULL)
        return -1;

    if (writer->out == NULL)
        count = 0;
    else
        count = xmlOutputBufferFlush(writer->out);

    return count;
}

/**
 * misc
 */

/**
 * xmlFreeTextWriterStackEntry:
 * @lk:  the xmlLinkPtr
 *
 * Free callback for the xmlList.
 */
static void
xmlFreeTextWriterStackEntry(xmlLinkPtr lk)
{
    xmlTextWriterStackEntry *p;

    p = (xmlTextWriterStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return;

    if (p->name != 0)
        xmlFree(p->name);
    xmlFree(p);
}

/**
 * xmlCmpTextWriterStackEntry:
 * @data0:  the first data
 * @data1:  the second data
 *
 * Compare callback for the xmlList.
 *
 * Returns -1, 0, 1
 */
static int
xmlCmpTextWriterStackEntry(const void *data0, const void *data1)
{
    xmlTextWriterStackEntry *p0;
    xmlTextWriterStackEntry *p1;

    if (data0 == data1)
        return 0;

    if (data0 == 0)
        return -1;

    if (data1 == 0)
        return 1;

    p0 = (xmlTextWriterStackEntry *) data0;
    p1 = (xmlTextWriterStackEntry *) data1;

    return xmlStrcmp(p0->name, p1->name);
}

/**
 * misc
 */

/**
 * xmlTextWriterOutputNSDecl:
 * @writer:  the xmlTextWriterPtr
 *
 * Output the current namespace declarations.
 */
static int
xmlTextWriterOutputNSDecl(xmlTextWriterPtr writer)
{
    xmlLinkPtr lk;
    xmlTextWriterNsStackEntry *np;
    int count;
    int sum;

    sum = 0;
    while (!xmlListEmpty(writer->nsstack)) {
        xmlChar *namespaceURI = NULL;
        xmlChar *prefix = NULL;

        lk = xmlListFront(writer->nsstack);
        np = (xmlTextWriterNsStackEntry *) xmlLinkGetData(lk);

        if (np != 0) {
            namespaceURI = xmlStrdup(np->uri);
            prefix = xmlStrdup(np->prefix);
        }

        xmlListPopFront(writer->nsstack);

        if (np != 0) {
            count = xmlTextWriterWriteAttribute(writer, prefix, namespaceURI);
            xmlFree(namespaceURI);
            xmlFree(prefix);

            if (count < 0) {
                xmlListDelete(writer->nsstack);
                writer->nsstack = NULL;
                return -1;
            }
            sum += count;
        }
    }
    return sum;
}

/**
 * xmlFreeTextWriterNsStackEntry:
 * @lk:  the xmlLinkPtr
 *
 * Free callback for the xmlList.
 */
static void
xmlFreeTextWriterNsStackEntry(xmlLinkPtr lk)
{
    xmlTextWriterNsStackEntry *p;

    p = (xmlTextWriterNsStackEntry *) xmlLinkGetData(lk);
    if (p == 0)
        return;

    if (p->prefix != 0)
        xmlFree(p->prefix);
    if (p->uri != 0)
        xmlFree(p->uri);

    xmlFree(p);
}

/**
 * xmlCmpTextWriterNsStackEntry:
 * @data0:  the first data
 * @data1:  the second data
 *
 * Compare callback for the xmlList.
 *
 * Returns -1, 0, 1
 */
static int
xmlCmpTextWriterNsStackEntry(const void *data0, const void *data1)
{
    xmlTextWriterNsStackEntry *p0;
    xmlTextWriterNsStackEntry *p1;
    int rc;

    if (data0 == data1)
        return 0;

    if (data0 == 0)
        return -1;

    if (data1 == 0)
        return 1;

    p0 = (xmlTextWriterNsStackEntry *) data0;
    p1 = (xmlTextWriterNsStackEntry *) data1;

    rc = xmlStrcmp(p0->prefix, p1->prefix);

    if ((rc != 0) || (p0->elem != p1->elem))
        rc = -1;

    return rc;
}

/**
 * xmlTextWriterWriteDocCallback:
 * @context:  the xmlBufferPtr
 * @str:  the data to write
 * @len:  the length of the data
 *
 * Write callback for the xmlOutputBuffer with target xmlBuffer
 *
 * Returns -1, 0, 1
 */
static int
xmlTextWriterWriteDocCallback(void *context, const xmlChar * str, int len)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) context;
    int rc;

    if ((rc = xmlParseChunk(ctxt, (const char *) str, len, 0)) != 0) {
        xmlWriterErrMsgInt(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterWriteDocCallback : XML error %d !\n",
                        rc);
        return -1;
    }

    return len;
}

/**
 * xmlTextWriterCloseDocCallback:
 * @context:  the xmlBufferPtr
 *
 * Close callback for the xmlOutputBuffer with target xmlBuffer
 *
 * Returns -1, 0, 1
 */
static int
xmlTextWriterCloseDocCallback(void *context)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) context;
    int rc;

    if ((rc = xmlParseChunk(ctxt, NULL, 0, 1)) != 0) {
        xmlWriterErrMsgInt(NULL, XML_ERR_INTERNAL_ERROR,
                        "xmlTextWriterWriteDocCallback : XML error %d !\n",
                        rc);
        return -1;
    }

    return 0;
}

/**
 * xmlTextWriterVSprintf:
 * @format:  see printf
 * @argptr:  pointer to the first member of the variable argument list.
 *
 * Utility function for formatted output
 *
 * Returns a new xmlChar buffer with the data or NULL on error. This buffer must be freed.
 */
static xmlChar *
xmlTextWriterVSprintf(const char *format, va_list argptr)
{
    int size;
    int count;
    xmlChar *buf;
    va_list locarg;

    size = BUFSIZ;
    buf = (xmlChar *) xmlMalloc(size);
    if (buf == NULL) {
        xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                        "xmlTextWriterVSprintf : out of memory!\n");
        return NULL;
    }

    VA_COPY(locarg, argptr);
    while (((count = vsnprintf((char *) buf, size, format, locarg)) < 0)
           || (count == size - 1) || (count == size) || (count > size)) {
        va_end(locarg);
        xmlFree(buf);
        size += BUFSIZ;
        buf = (xmlChar *) xmlMalloc(size);
        if (buf == NULL) {
            xmlWriterErrMsg(NULL, XML_ERR_NO_MEMORY,
                            "xmlTextWriterVSprintf : out of memory!\n");
            return NULL;
        }
        VA_COPY(locarg, argptr);
    }
    va_end(locarg);

    return buf;
}

/**
 * xmlTextWriterStartDocumentCallback:
 * @ctx: the user data (XML parser context)
 *
 * called at the start of document processing.
 */
static void
xmlTextWriterStartDocumentCallback(void *ctx)
{
    xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
    xmlDocPtr doc;

    if (ctxt->html) {
#ifdef LIBXML_HTML_ENABLED
        if (ctxt->myDoc == NULL)
            ctxt->myDoc = htmlNewDocNoDtD(NULL, NULL);
        if (ctxt->myDoc == NULL) {
            if ((ctxt->sax != NULL) && (ctxt->sax->error != NULL))
                ctxt->sax->error(ctxt->userData,
                                 "SAX.startDocument(): out of memory\n");
            ctxt->errNo = XML_ERR_NO_MEMORY;
            ctxt->instate = XML_PARSER_EOF;
            ctxt->disableSAX = 1;
            return;
        }
#else
        xmlWriterErrMsg(NULL, XML_ERR_INTERNAL_ERROR,
                        "libxml2 built without HTML support\n");
        ctxt->errNo = XML_ERR_INTERNAL_ERROR;
        ctxt->instate = XML_PARSER_EOF;
        ctxt->disableSAX = 1;
        return;
#endif
    } else {
        doc = ctxt->myDoc;
        if (doc == NULL)
            doc = ctxt->myDoc = xmlNewDoc(ctxt->version);
        if (doc != NULL) {
            if (doc->children == NULL) {
                if (ctxt->encoding != NULL)
                    doc->encoding = xmlStrdup(ctxt->encoding);
                else
                    doc->encoding = NULL;
                doc->standalone = ctxt->standalone;
            }
        } else {
            if ((ctxt->sax != NULL) && (ctxt->sax->error != NULL))
                ctxt->sax->error(ctxt->userData,
                                 "SAX.startDocument(): out of memory\n");
            ctxt->errNo = XML_ERR_NO_MEMORY;
            ctxt->instate = XML_PARSER_EOF;
            ctxt->disableSAX = 1;
            return;
        }
    }
    if ((ctxt->myDoc != NULL) && (ctxt->myDoc->URL == NULL) &&
        (ctxt->input != NULL) && (ctxt->input->filename != NULL)) {
        ctxt->myDoc->URL =
            xmlCanonicPath((const xmlChar *) ctxt->input->filename);
        if (ctxt->myDoc->URL == NULL)
            ctxt->myDoc->URL =
                xmlStrdup((const xmlChar *) ctxt->input->filename);
    }
}

/**
 * xmlTextWriterSetIndent:
 * @writer:  the xmlTextWriterPtr
 * @indent:  do indentation?
 *
 * Set indentation output. indent = 0 do not indentation. indent > 0 do indentation.
 *
 * Returns -1 on error or 0 otherwise.
 */
int
xmlTextWriterSetIndent(xmlTextWriterPtr writer, int indent)
{
    if ((writer == NULL) || (indent < 0))
        return -1;

    writer->indent = indent;
    writer->doindent = 1;

    return 0;
}

/**
 * xmlTextWriterSetIndentString:
 * @writer:  the xmlTextWriterPtr
 * @str:  the xmlChar string
 *
 * Set string indentation.
 *
 * Returns -1 on error or 0 otherwise.
 */
int
xmlTextWriterSetIndentString(xmlTextWriterPtr writer, const xmlChar * str)
{
    if ((writer == NULL) || (!str))
        return -1;

    if (writer->ichar != NULL)
        xmlFree(writer->ichar);
    writer->ichar = xmlStrdup(str);

    if (!writer->ichar)
        return -1;
    else
        return 0;
}

/**
 * xmlTextWriterWriteIndent:
 * @writer:  the xmlTextWriterPtr
 *
 * Write indent string.
 *
 * Returns -1 on error or the number of strings written.
 */
static int
xmlTextWriterWriteIndent(xmlTextWriterPtr writer)
{
    int lksize;
    int i;
    int ret;

    lksize = xmlListSize(writer->nodes);
    if (lksize < 1)
        return (-1);            /* list is empty */
    for (i = 0; i < (lksize - 1); i++) {
        ret = xmlOutputBufferWriteString(writer->out,
                                         (const char *) writer->ichar);
        if (ret == -1)
            return (-1);
    }

    return (lksize - 1);
}

/**
 * xmlTextWriterHandleStateDependencies:
 * @writer:  the xmlTextWriterPtr
 * @p:  the xmlTextWriterStackEntry
 *
 * Write state dependent strings.
 *
 * Returns -1 on error or the number of characters written.
 */
static int
xmlTextWriterHandleStateDependencies(xmlTextWriterPtr writer,
                                     xmlTextWriterStackEntry * p)
{
    int count;
    int sum;
    char extra[3];

    if (writer == NULL)
        return -1;

    if (p == NULL)
        return 0;

    sum = 0;
    extra[0] = extra[1] = extra[2] = '\0';
    if (p != 0) {
        sum = 0;
        switch (p->state) {
            case XML_TEXTWRITER_NAME:
                /* Output namespace declarations */
                count = xmlTextWriterOutputNSDecl(writer);
                if (count < 0)
                    return -1;
                sum += count;
                extra[0] = '>';
                p->state = XML_TEXTWRITER_TEXT;
                break;
            case XML_TEXTWRITER_PI:
                extra[0] = ' ';
                p->state = XML_TEXTWRITER_PI_TEXT;
                break;
            case XML_TEXTWRITER_DTD:
                extra[0] = ' ';
                extra[1] = '[';
                p->state = XML_TEXTWRITER_DTD_TEXT;
                break;
            case XML_TEXTWRITER_DTD_ELEM:
                extra[0] = ' ';
                p->state = XML_TEXTWRITER_DTD_ELEM_TEXT;
                break;
            case XML_TEXTWRITER_DTD_ATTL:
                extra[0] = ' ';
                p->state = XML_TEXTWRITER_DTD_ATTL_TEXT;
                break;
            case XML_TEXTWRITER_DTD_ENTY:
            case XML_TEXTWRITER_DTD_PENT:
                extra[0] = ' ';
                extra[1] = writer->qchar;
                p->state = XML_TEXTWRITER_DTD_ENTY_TEXT;
                break;
            default:
                break;
        }
    }

    if (*extra != '\0') {
        count = xmlOutputBufferWriteString(writer->out, extra);
        if (count < 0)
            return -1;
        sum += count;
    }

    return sum;
}

#define bottom_xmlwriter
#include "elfgcchack.h"
#endif
/* [<][>][^][v][top][bottom][index][help] */
root/third_party/libxml/src/xmlwriter.c

DEFINITIONS
