root/magick/utility.c

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DEFINITIONS

This source file includes following definitions.
  1. AcquireUniqueFilename
  2. MagickMin
  3. AcquireUniqueSymbolicLink
  4. AppendImageFormat
  5. Base64Decode
  6. Base64Encode
  7. ChopPathComponents
  8. ExpandFilename
  9. ExpandFilenames
  10. GetExecutionPath
  11. GetMagickPageSize
  12. GetPathAttributes
  13. GetPathComponent
  14. GetPathComponents
  15. IsPathAccessible
  16. IsPathDirectory
  17. MagickReadDirectory
  18. ListFiles
  19. MagickDelay
  20. MultilineCensus
  21. ShredFile
  22. SystemCommand

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%             U   U  TTTTT  IIIII  L      IIIII  TTTTT  Y   Y                 %
%             U   U    T      I    L        I      T     Y Y                  %
%             U   U    T      I    L        I      T      Y                   %
%             U   U    T      I    L        I      T      Y                   %
%              UUU     T    IIIII  LLLLL  IIIII    T      Y                   %
%                                                                             %
%                                                                             %
%                       MagickCore Utility Methods                            %
%                                                                             %
%                             Software Design                                 %
%                               John Cristy                                   %
%                              January 1993                                   %
%                                                                             %
%                                                                             %
%  Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization      %
%  dedicated to making software imaging solutions freely available.           %
%                                                                             %
%  You may not use this file except in compliance with the License.  You may  %
%  obtain a copy of the License at                                            %
%                                                                             %
%    http://www.imagemagick.org/script/license.php                            %
%                                                                             %
%  Unless required by applicable law or agreed to in writing, software        %
%  distributed under the License is distributed on an "AS IS" BASIS,          %
%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
%  See the License for the specific language governing permissions and        %
%  limitations under the License.                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
*/

/*
  Include declarations.
*/
#include "magick/studio.h"
#include "magick/property.h"
#include "magick/blob.h"
#include "magick/color.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/geometry.h"
#include "magick/list.h"
#include "magick/log.h"
#include "magick/memory_.h"
#include "magick/option.h"
#include "magick/policy.h"
#include "magick/random_.h"
#include "magick/registry.h"
#include "magick/resource_.h"
#include "magick/semaphore.h"
#include "magick/signature-private.h"
#include "magick/statistic.h"
#include "magick/string_.h"
#include "magick/string-private.h"
#include "magick/token.h"
#include "magick/utility.h"
#include "magick/utility-private.h"
#if defined(MAGICKCORE_HAVE_PROCESS_H)
#include <process.h>
#endif
#if defined(MAGICKCORE_HAVE_MACH_O_DYLD_H)
#include <mach-o/dyld.h>
#endif

/*
  Static declarations.
*/
static const char
  Base64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

/*
  Forward declaration.
*/
static int
  IsPathDirectory(const char *);

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   A c q u i r e U n i q u e F i l e n a m e                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  AcquireUniqueFilename() replaces the contents of path by a unique path name.
%
%  The format of the AcquireUniqueFilename method is:
%
%      MagickBooleanType AcquireUniqueFilename(char *path)
%
%  A description of each parameter follows.
%
%   o  path:  Specifies a pointer to an array of characters.  The unique path
%      name is returned in this array.
%
*/
MagickExport MagickBooleanType AcquireUniqueFilename(char *path)
{
  int
    file;

  file=AcquireUniqueFileResource(path);
  if (file == -1)
    return(MagickFalse);
  file=close(file)-1;
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   A c q u i r e U n i q u e S ym b o l i c L i n k                          %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  AcquireUniqueSymbolicLink() creates a unique symbolic link to the specified
%  source path and returns MagickTrue on success otherwise MagickFalse.  If the
%  symlink() method fails or is not available, a unique file name is generated
%  and the source file copied to it.  When you are finished with the file, use
%  RelinquishUniqueFilename() to destroy it.
%
%  The format of the AcquireUniqueSymbolicLink method is:
%
%      MagickBooleanType AcquireUniqueSymbolicLink(const char *source,
%        char destination)
%
%  A description of each parameter follows.
%
%   o  source:  the source path.
%
%   o  destination:  the destination path.
%
*/

static inline MagickSizeType MagickMin(const MagickSizeType x,
  const MagickSizeType y)
{
  if (x < y)
    return(x);
  return(y);
}

MagickExport MagickBooleanType AcquireUniqueSymbolicLink(const char *source,
  char *destination)
{
  int
    destination_file,
    source_file;

  size_t
    length,
    quantum;

  ssize_t
    count;

  struct stat
    attributes;

  unsigned char
    *buffer;

  assert(source != (const char *) NULL);
  assert(destination != (char *) NULL);
#if defined(MAGICKCORE_HAVE_SYMLINK)
  (void) AcquireUniqueFilename(destination);
  (void) RelinquishUniqueFileResource(destination);
  if (*source == *DirectorySeparator)
    {
      if (symlink(source,destination) == 0)
        return(MagickTrue);
    }
  else
    {
      char
        path[MaxTextExtent];

      *path='\0';
      if (getcwd(path,MaxTextExtent) == (char *) NULL)
        return(MagickFalse);
      (void) ConcatenateMagickString(path,DirectorySeparator,MaxTextExtent);
      (void) ConcatenateMagickString(path,source,MaxTextExtent);
      if (symlink(path,destination) == 0)
        return(MagickTrue);
    }
#endif
  destination_file=AcquireUniqueFileResource(destination);
  if (destination_file == -1)
    return(MagickFalse);
  source_file=open_utf8(source,O_RDONLY | O_BINARY,0);
  if (source_file == -1)
    {
      (void) close(destination_file);
      (void) RelinquishUniqueFileResource(destination);
      return(MagickFalse);
    }
  quantum=(size_t) MagickMaxBufferExtent;
  if ((fstat(source_file,&attributes) == 0) && (attributes.st_size != 0))
    quantum=(size_t) MagickMin((size_t) attributes.st_size,
      MagickMaxBufferExtent);
  buffer=(unsigned char *) AcquireQuantumMemory(quantum,sizeof(*buffer));
  if (buffer == (unsigned char *) NULL)
    {
      (void) close(source_file);
      (void) close(destination_file);
      (void) RelinquishUniqueFileResource(destination);
      return(MagickFalse);
    }
  for (length=0; ; )
  {
    count=(ssize_t) read(source_file,buffer,quantum);
    if (count <= 0)
      break;
    length=(size_t) count;
    count=(ssize_t) write(destination_file,buffer,length);
    if ((size_t) count != length)
      {
        (void) close(destination_file);
        (void) close(source_file);
        buffer=(unsigned char *) RelinquishMagickMemory(buffer);
        (void) RelinquishUniqueFileResource(destination);
        return(MagickFalse);
      }
  }
  (void) close(destination_file);
  (void) close(source_file);
  buffer=(unsigned char *) RelinquishMagickMemory(buffer);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  A p p e n d I m a g e F o r m a t                                          %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  AppendImageFormat() appends the image format type to the filename.  If an
%  extension to the file already exists, it is first removed.
%
%  The format of the AppendImageFormat method is:
%
%      void AppendImageFormat(const char *format,char *filename)
%
%  A description of each parameter follows.
%
%   o  format:  Specifies a pointer to an array of characters.  This the
%      format of the image.
%
%   o  filename:  Specifies a pointer to an array of characters.  The unique
%      file name is returned in this array.
%
*/
MagickExport void AppendImageFormat(const char *format,char *filename)
{
  char
    extension[MaxTextExtent],
    root[MaxTextExtent];

  assert(format != (char *) NULL);
  assert(filename != (char *) NULL);
  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",filename);
  if ((*format == '\0') || (*filename == '\0'))
    return;
  if (LocaleCompare(filename,"-") == 0)
    {
      char
        message[MaxTextExtent];

      (void) FormatLocaleString(message,MaxTextExtent,"%s:%s",format,filename);
      (void) CopyMagickString(filename,message,MaxTextExtent);
      return;
    }
  GetPathComponent(filename,ExtensionPath,extension);
  if ((LocaleCompare(extension,"Z") == 0) ||
      (LocaleCompare(extension,"bz2") == 0) ||
      (LocaleCompare(extension,"gz") == 0) ||
      (LocaleCompare(extension,"wmz") == 0) ||
      (LocaleCompare(extension,"svgz") == 0))
    {
      GetPathComponent(filename,RootPath,root);
      (void) CopyMagickString(filename,root,MaxTextExtent);
      GetPathComponent(filename,RootPath,root);
      (void) FormatLocaleString(filename,MaxTextExtent,"%s.%s.%s",root,format,
        extension);
      return;
    }
  GetPathComponent(filename,RootPath,root);
  (void) FormatLocaleString(filename,MaxTextExtent,"%s.%s",root,format);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   B a s e 6 4 D e c o d e                                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Base64Decode() decodes Base64-encoded text and returns its binary
%  equivalent.  NULL is returned if the text is not valid Base64 data, or a
%  memory allocation failure occurs.
%
%  The format of the Base64Decode method is:
%
%      unsigned char *Base64Decode(const char *source,length_t *length)
%
%  A description of each parameter follows:
%
%    o source:  A pointer to a Base64-encoded string.
%
%    o length: the number of bytes decoded.
%
*/
MagickExport unsigned char *Base64Decode(const char *source,size_t *length)
{
  int
    state;

  register const char
    *p,
    *q;

  register size_t
    i;

  unsigned char
    *decode;

  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  assert(source != (char *) NULL);
  assert(length != (size_t *) NULL);
  *length=0;
  decode=(unsigned char *) AcquireQuantumMemory(strlen(source)/4+4,
    3*sizeof(*decode));
  if (decode == (unsigned char *) NULL)
    return((unsigned char *) NULL);
  i=0;
  state=0;
  for (p=source; *p != '\0'; p++)
  {
    if (isspace((int) ((unsigned char) *p)) != 0)
      continue;
    if (*p == '=')
      break;
    q=strchr(Base64,*p);
    if (q == (char *) NULL)
      {
        decode=(unsigned char *) RelinquishMagickMemory(decode);
        return((unsigned char *) NULL);  /* non-Base64 character */
      }
    switch (state)
    {
      case 0:
      {
        decode[i]=(q-Base64) << 2;
        state++;
        break;
      }
      case 1:
      {
        decode[i++]|=(q-Base64) >> 4;
        decode[i]=((q-Base64) & 0x0f) << 4;
        state++;
        break;
      }
      case 2:
      {
        decode[i++]|=(q-Base64) >> 2;
        decode[i]=((q-Base64) & 0x03) << 6;
        state++;
        break;
      }
      case 3:
      {
        decode[i++]|=(q-Base64);
        state=0;
        break;
      }
    }
  }
  /*
    Verify Base-64 string has proper terminal characters.
  */
  if (*p != '=')
    {
      if (state != 0)
        {
          decode=(unsigned char *) RelinquishMagickMemory(decode);
          return((unsigned char *) NULL);
        }
    }
  else
    {
      p++;
      switch (state)
      {
        case 0:
        case 1:
        {
          /*
            Unrecognized '=' character.
          */
          decode=(unsigned char *) RelinquishMagickMemory(decode);
          return((unsigned char *) NULL);
        }
        case 2:
        {
          for ( ; *p != '\0'; p++)
            if (isspace((int) ((unsigned char) *p)) == 0)
              break;
          if (*p != '=')
            {
              decode=(unsigned char *) RelinquishMagickMemory(decode);
              return((unsigned char *) NULL);
            }
          p++;
        }
        case 3:
        {
          for ( ; *p != '\0'; p++)
            if (isspace((int) ((unsigned char) *p)) == 0)
              {
                decode=(unsigned char *) RelinquishMagickMemory(decode);
                return((unsigned char *) NULL);
              }
          if ((int) decode[i] != 0)
            {
              decode=(unsigned char *) RelinquishMagickMemory(decode);
              return((unsigned char *) NULL);
            }
        }
      }
    }
  *length=i;
  return(decode);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   B a s e 6 4 E n c o d e                                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  Base64Encode() encodes arbitrary binary data to Base64 encoded format as
%  described by the "Base64 Content-Transfer-Encoding" section of RFC 2045 and
%  returns the result as a null-terminated ASCII string.  NULL is returned if
%  a memory allocation failure occurs.
%
%  The format of the Base64Encode method is:
%
%      char *Base64Encode(const unsigned char *blob,const size_t blob_length,
%        size_t *encode_length)
%
%  A description of each parameter follows:
%
%    o blob:  A pointer to binary data to encode.
%
%    o blob_length: the number of bytes to encode.
%
%    o encode_length:  The number of bytes encoded.
%
*/
MagickExport char *Base64Encode(const unsigned char *blob,
  const size_t blob_length,size_t *encode_length)
{
  char
    *encode;

  register const unsigned char
    *p;

  register size_t
    i;

  size_t
    remainder;

  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  assert(blob != (const unsigned char *) NULL);
  assert(blob_length != 0);
  assert(encode_length != (size_t *) NULL);
  *encode_length=0;
  encode=(char *) AcquireQuantumMemory(blob_length/3+4,4*sizeof(*encode));
  if (encode == (char *) NULL)
    return((char *) NULL);
  i=0;
  for (p=blob; p < (blob+blob_length-2); p+=3)
  {
    encode[i++]=Base64[(int) (*p >> 2)];
    encode[i++]=Base64[(int) (((*p & 0x03) << 4)+(*(p+1) >> 4))];
    encode[i++]=Base64[(int) (((*(p+1) & 0x0f) << 2)+(*(p+2) >> 6))];
    encode[i++]=Base64[(int) (*(p+2) & 0x3f)];
  }
  remainder=blob_length % 3;
  if (remainder != 0)
    {
      ssize_t
        j;

      unsigned char
        code[3];

      code[0]='\0';
      code[1]='\0';
      code[2]='\0';
      for (j=0; j < (ssize_t) remainder; j++)
        code[j]=(*p++);
      encode[i++]=Base64[(int) (code[0] >> 2)];
      encode[i++]=Base64[(int) (((code[0] & 0x03) << 4)+(code[1] >> 4))];
      if (remainder == 1)
        encode[i++]='=';
      else
        encode[i++]=Base64[(int) (((code[1] & 0x0f) << 2)+(code[2] >> 6))];
      encode[i++]='=';
    }
  *encode_length=i;
  encode[i++]='\0';
  return(encode);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   C h o p P a t h C o m p o n e n t s                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ChopPathComponents() removes the number of specified file components from a
%  path.
%
%  The format of the ChopPathComponents method is:
%
%      ChopPathComponents(char *path,size_t components)
%
%  A description of each parameter follows:
%
%    o path:  The path.
%
%    o components:  The number of components to chop.
%
*/
MagickExport void ChopPathComponents(char *path,const size_t components)
{
  register ssize_t
    i;

  for (i=0; i < (ssize_t) components; i++)
    GetPathComponent(path,HeadPath,path);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   E x p a n d F i l e n a m e                                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ExpandFilename() expands '~' in a path.
%
%  The format of the ExpandFilename function is:
%
%      ExpandFilename(char *path)
%
%  A description of each parameter follows:
%
%    o path: Specifies a pointer to a character array that contains the
%      path.
%
*/
MagickExport void ExpandFilename(char *path)
{
  char
    expand_path[MaxTextExtent];

  if (path == (char *) NULL)
    return;
  if (*path != '~')
    return;
  (void) CopyMagickString(expand_path,path,MaxTextExtent);
  if ((*(path+1) == *DirectorySeparator) || (*(path+1) == '\0'))
    {
      char
        *home;

      /*
        Substitute ~ with $HOME.
      */
      (void) CopyMagickString(expand_path,".",MaxTextExtent);
      (void) ConcatenateMagickString(expand_path,path+1,MaxTextExtent);
      home=GetEnvironmentValue("HOME");
      if (home == (char *) NULL)
        home=GetEnvironmentValue("USERPROFILE");
      if (home != (char *) NULL)
        {
          (void) CopyMagickString(expand_path,home,MaxTextExtent);
          (void) ConcatenateMagickString(expand_path,path+1,MaxTextExtent);
          home=DestroyString(home);
        }
    }
  else
    {
#if defined(MAGICKCORE_POSIX_SUPPORT) && !defined(__OS2__)
      char
        username[MaxTextExtent];

      register char
        *p;

      struct passwd
        *entry;

      /*
        Substitute ~ with home directory from password file.
      */
      (void) CopyMagickString(username,path+1,MaxTextExtent);
      p=strchr(username,'/');
      if (p != (char *) NULL)
        *p='\0';
      entry=getpwnam(username);
      if (entry == (struct passwd *) NULL)
        return;
      (void) CopyMagickString(expand_path,entry->pw_dir,MaxTextExtent);
      if (p != (char *) NULL)
        {
          (void) ConcatenateMagickString(expand_path,"/",MaxTextExtent);
          (void) ConcatenateMagickString(expand_path,p+1,MaxTextExtent);
        }
#endif
    }
  (void) CopyMagickString(path,expand_path,MaxTextExtent);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   E x p a n d F i l e n a m e s                                             %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ExpandFilenames() checks each argument of the given argument array, and
%  expands it if they have a wildcard character.
%
%  Any coder prefix (EG: 'coder:filename') or read modifier postfix (EG:
%  'filename[...]') are ignored during the file the expansion, but will be
%  included in the final argument.  If no filename matching the meta-character
%  'glob' is found the original argument is returned.
%
%  For example, an argument of '*.gif[20x20]' will be replaced by the list
%    'abc.gif[20x20]',  'foobar.gif[20x20]',  'xyzzy.gif[20x20]'
%  if such filenames exist, (in the current directory in this case).
%
%  Meta-characters handled...
%     @    read a list of filenames (no further expansion performed)
%     ~    At start of filename expands to HOME environemtn variable
%     *    matches any string including an empty string
%     ?    matches by any single character
%
%  WARNING: filenames starting with '.' (hidden files in a UNIX file system)
%  will never be expanded.  Attempting to epand '.*' will produce no change.
%
%  Expansion is ignored for coders "label:" "caption:" "pango:" and "vid:".
%  Which provide their own '@' meta-character handling.
%
%  You can see the results of the expansion using "Configure" log events.
%
%  The returned list should be freed using  DestroyStringList().
%
%  However the strings in the original pointed to argv are not
%  freed  (TO BE CHECKED).  So a copy of the original pointer (and count)
%  should be kept separate if they need to be freed later.
%
%  The format of the ExpandFilenames function is:
%
%      status=ExpandFilenames(int *number_arguments,char ***arguments)
%
%  A description of each parameter follows:
%
%    o number_arguments: Specifies a pointer to an integer describing the
%      number of elements in the argument vector.
%
%    o arguments: Specifies a pointer to a text array containing the command
%      line arguments.
%
*/
MagickExport MagickBooleanType ExpandFilenames(int *number_arguments,
  char ***arguments)
{
  char
    *directory,
    home_directory[MaxTextExtent],
    **vector;

  register ssize_t
    i,
    j;

  size_t
    number_files;

  ssize_t
    count,
    parameters;

  /*
    Allocate argument vector.
  */
  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
  assert(number_arguments != (int *) NULL);
  assert(arguments != (char ***) NULL);
  vector=(char **) AcquireQuantumMemory((size_t) (*number_arguments+1),
    sizeof(*vector));
  if (vector == (char **) NULL)
    ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
  /*
    Expand any wildcard filenames.
  */
  *home_directory='\0';
  count=0;
  for (i=0; i < (ssize_t) *number_arguments; i++)
  {
    char
      **filelist,
      filename[MaxTextExtent],
      magick[MaxTextExtent],
      *option,
      path[MaxTextExtent],
      subimage[MaxTextExtent];

    MagickBooleanType
      destroy;

    option=(*arguments)[i];
    *magick='\0';
    *path='\0';
    *filename='\0';
    *subimage='\0';
    vector[count++]=ConstantString(option);
    destroy=MagickTrue;
    parameters=ParseCommandOption(MagickCommandOptions,MagickFalse,option);
    if (parameters > 0)
      {
        /*
          Do not expand command option parameters.
        */
        for (j=0; j < parameters; j++)
        {
          i++;
          if (i == (ssize_t) *number_arguments)
            break;
          option=(*arguments)[i];
          vector[count++]=ConstantString(option);
        }
        continue;
      }
    if ((*option == '"') || (*option == '\''))
      continue;
    GetPathComponent(option,TailPath,filename);
    GetPathComponent(option,MagickPath,magick);
    if ((LocaleCompare(magick,"CAPTION") == 0) ||
        (LocaleCompare(magick,"LABEL") == 0) ||
        (LocaleCompare(magick,"PANGO") == 0) ||
        (LocaleCompare(magick,"VID") == 0))
      continue;
    if ((IsGlob(filename) == MagickFalse) && (*option != '@'))
      continue;
    if (*option != '@')
      {
        /*
          Generate file list from wildcard filename (e.g. *.jpg).
        */
        GetPathComponent(option,HeadPath,path);
        GetPathComponent(option,SubimagePath,subimage);
        ExpandFilename(path);
        if (*home_directory == '\0')
          directory=getcwd(home_directory,MaxTextExtent-1);
        (void) directory;
        filelist=ListFiles(*path == '\0' ? home_directory : path,filename,
          &number_files);
      }
    else
      {
        char
          *files;

        ExceptionInfo
          *exception;

        int
          length;

        /*
          Generate file list from file list (e.g. @filelist.txt).
        */
        exception=AcquireExceptionInfo();
        files=FileToString(option+1,~0,exception);
        exception=DestroyExceptionInfo(exception);
        if (files == (char *) NULL)
          continue;
        filelist=StringToArgv(files,&length);
        if (filelist == (char **) NULL)
          continue;
        files=DestroyString(files);
        filelist[0]=DestroyString(filelist[0]);
        for (j=0; j < (ssize_t) (length-1); j++)
          filelist[j]=filelist[j+1];
        number_files=(size_t) length-1;
      }
    if (filelist == (char **) NULL)
      continue;
    for (j=0; j < (ssize_t) number_files; j++)
      if (IsPathDirectory(filelist[j]) <= 0)
        break;
    if (j == (ssize_t) number_files)
      {
        for (j=0; j < (ssize_t) number_files; j++)
          filelist[j]=DestroyString(filelist[j]);
        filelist=(char **) RelinquishMagickMemory(filelist);
        continue;
      }
    /*
      Transfer file list to argument vector.
    */
    vector=(char **) ResizeQuantumMemory(vector,(size_t) *number_arguments+
      count+number_files+1,sizeof(*vector));
    if (vector == (char **) NULL)
      return(MagickFalse);
    for (j=0; j < (ssize_t) number_files; j++)
    {
      option=filelist[j];
      parameters=ParseCommandOption(MagickCommandOptions,MagickFalse,option);
      if (parameters > 0)
        {
          ssize_t
            k;

          /*
            Do not expand command option parameters.
          */
          vector[count++]=ConstantString(option);
          for (k=0; k < parameters; k++)
          {
            j++;
            if (j == (ssize_t) number_files)
              break;
            option=filelist[j];
            vector[count++]=ConstantString(option);
          }
          continue;
        }
      (void) CopyMagickString(filename,path,MaxTextExtent);
      if (*path != '\0')
        (void) ConcatenateMagickString(filename,DirectorySeparator,
          MaxTextExtent);
      (void) ConcatenateMagickString(filename,filelist[j],MaxTextExtent);
      filelist[j]=DestroyString(filelist[j]);
      if (strlen(filename) >= (MaxTextExtent-1))
        ThrowFatalException(OptionFatalError,"FilenameTruncated");
      if (IsPathDirectory(filename) <= 0)
        {
          char
            path[MaxTextExtent];

          *path='\0';
          if (*magick != '\0')
            {
              (void) ConcatenateMagickString(path,magick,MaxTextExtent);
              (void) ConcatenateMagickString(path,":",MaxTextExtent);
            }
          (void) ConcatenateMagickString(path,filename,MaxTextExtent);
          if (*subimage != '\0')
            {
              (void) ConcatenateMagickString(path,"[",MaxTextExtent);
              (void) ConcatenateMagickString(path,subimage,MaxTextExtent);
              (void) ConcatenateMagickString(path,"]",MaxTextExtent);
            }
          if (strlen(path) >= (MaxTextExtent-1))
            ThrowFatalException(OptionFatalError,"FilenameTruncated");
          if (destroy != MagickFalse)
            {
              count--;
              vector[count]=DestroyString(vector[count]);
              destroy=MagickFalse;
            }
          vector[count++]=ConstantString(path);
        }
    }
    filelist=(char **) RelinquishMagickMemory(filelist);
  }
  vector[count]=(char *) NULL;
  if (IsEventLogging() != MagickFalse)
    {
      char
        *command_line;

      command_line=AcquireString(vector[0]);
      for (i=1; i < count; i++)
      {
        (void) ConcatenateString(&command_line," {");
        (void) ConcatenateString(&command_line,vector[i]);
        (void) ConcatenateString(&command_line,"}");
      }
      (void) LogMagickEvent(ConfigureEvent,GetMagickModule(),
        "Command line: %s",command_line);
      command_line=DestroyString(command_line);
    }
  *number_arguments=(int) count;
  *arguments=vector;
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   G e t E x e c u t i o n P a t h                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetExecutionPath() returns the pathname of the executable that started
%  the process.  On success MagickTrue is returned, otherwise MagickFalse.
%
%  The format of the GetExecutionPath method is:
%
%      MagickBooleanType GetExecutionPath(char *path,const size_t extent)
%
%  A description of each parameter follows:
%
%    o path: the pathname of the executable that started the process.
%
%    o extent: the maximum extent of the path.
%
*/
MagickExport MagickBooleanType GetExecutionPath(char *path,const size_t extent)
{
  char
    *directory;

  *path='\0';
  directory=getcwd(path,(unsigned long) extent);
  (void) directory;
#if defined(MAGICKCORE_HAVE_GETPID) && defined(MAGICKCORE_HAVE_READLINK) && defined(PATH_MAX)
  {
    char
      link_path[MaxTextExtent],
      execution_path[PATH_MAX+1];

    ssize_t
      count;

    (void) FormatLocaleString(link_path,MaxTextExtent,"/proc/%.20g/exe",
      (double) getpid());
    count=readlink(link_path,execution_path,PATH_MAX);
    if (count == -1)
      {
        (void) FormatLocaleString(link_path,MaxTextExtent,"/proc/%.20g/file",
          (double) getpid());
        count=readlink(link_path,execution_path,PATH_MAX);
      }
    if ((count > 0) && (count <= (ssize_t) PATH_MAX))
      {
        execution_path[count]='\0';
        (void) CopyMagickString(path,execution_path,extent);
      }
  }
#endif
#if defined(MAGICKCORE_HAVE__NSGETEXECUTABLEPATH)
  {
    char
      executable_path[PATH_MAX << 1],
      execution_path[PATH_MAX+1];

    uint32_t
      length;

    length=sizeof(executable_path);
    if ((_NSGetExecutablePath(executable_path,&length) == 0) &&
        (realpath(executable_path,execution_path) != (char *) NULL))
      (void) CopyMagickString(path,execution_path,extent);
  }
#endif
#if defined(MAGICKCORE_HAVE_GETEXECNAME)
  {
    const char
      *execution_path;

    execution_path=(const char *) getexecname();
    if (execution_path != (const char *) NULL)
      {
        if (*execution_path != *DirectorySeparator)
          (void) ConcatenateMagickString(path,DirectorySeparator,extent);
        (void) ConcatenateMagickString(path,execution_path,extent);
      }
  }
#endif
#if defined(MAGICKCORE_WINDOWS_SUPPORT)
  NTGetExecutionPath(path,extent);
#endif
#if defined(__GNU__)
  {
    char
      *program_name,
      *execution_path;

    ssize_t
      count;

    count=0;
    execution_path=(char *) NULL;
    program_name=program_invocation_name;
    if (*program_invocation_name != '/')
      {
        size_t
          extent;

        extent=strlen(directory)+strlen(program_name)+2;
        program_name=AcquireQuantumMemory(extent,sizeof(*program_name));
        if (program_name == (char *) NULL)
          program_name=program_invocation_name;
        else
          count=FormatLocaleString(program_name,extent,"%s/%s",directory,
            program_invocation_name);
      }
    if (count != -1)
      {
        execution_path=realpath(program_name,NULL);
        if (execution_path != (char *) NULL)
          (void) CopyMagickString(path,execution_path,extent);
      }
    if (program_name != program_invocation_name)
      program_name=(char *) RelinquishMagickMemory(program_name);
    execution_path=(char *) RelinquishMagickMemory(execution_path);
  }
#endif
#if defined(__OpenBSD__)
  {
    extern char
      *__progname;

    (void) CopyMagickString(path,__progname,extent);
  }
#endif
  return(IsPathAccessible(path));
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   G e t M a g i c k P a g e S i z e                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetMagickPageSize() returns the memory page size.
%
%  The format of the GetMagickPageSize method is:
%
%      ssize_t GetMagickPageSize()
%
*/
MagickExport ssize_t GetMagickPageSize(void)
{
  static ssize_t
    page_size = -1;

  if (page_size > 0)
    return(page_size);
#if defined(MAGICKCORE_HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
  page_size=(ssize_t) sysconf(_SC_PAGE_SIZE);
#else
#if defined(MAGICKCORE_HAVE_GETPAGESIZE)
  page_size=(ssize_t) getpagesize();
#endif
#endif
  if (page_size <= 0)
    page_size=16384;
  return(page_size);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   G e t P a t h A t t r i b u t e s                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetPathAttributes() returns attributes (e.g. size of file) about a path.
%
%  The path of the GetPathAttributes method is:
%
%      MagickBooleanType GetPathAttributes(const char *path,void *attributes)
%
%  A description of each parameter follows.
%
%   o  path: the file path.
%
%   o  attributes: the path attributes are returned here.
%
*/
MagickExport MagickBooleanType GetPathAttributes(const char *path,
  void *attributes)
{
  MagickBooleanType
    status;

  if (path == (const char *) NULL)
    {
      errno=EINVAL;
      return(MagickFalse);
    }
  status=stat_utf8(path,(struct stat *) attributes) == 0 ? MagickTrue :
    MagickFalse;
  return(status);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   G e t P a t h C o m p o n e n t                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetPathComponent() returns the parent directory name, filename, basename, or
%  extension of a file path.
%
%  The component string pointed to must have at least MaxTextExtent space
%  for the results to be stored.
%
%  The format of the GetPathComponent function is:
%
%      GetPathComponent(const char *path,PathType type,char *component)
%
%  A description of each parameter follows:
%
%    o path: Specifies a pointer to a character array that contains the
%      file path.
%
%    o type: Specififies which file path component to return.
%
%    o component: the selected file path component is returned here.
%
*/
MagickExport void GetPathComponent(const char *path,PathType type,
  char *component)
{
  char
    magick[MaxTextExtent],
    *q,
    subimage[MaxTextExtent];

  register char
    *p;

  assert(path != (const char *) NULL);
  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",path);
  assert(component != (char *) NULL);
  if (*path == '\0')
    {
      *component='\0';
      return;
    }
  (void) CopyMagickString(component,path,MaxTextExtent);
  *magick='\0';
#if defined(__OS2__)
  if (path[1] != ":")
#endif
  for (p=component; *p != '\0'; p++)
  {
    if ((*p == '%') && (*(p+1) == '['))
      {
        /*
          Skip over %[...].
        */
        for (p++; (*p != ']') && (*p != '\0'); p++) ;
        if (*p == '\0')
          break;
      }
    if ((*p == ':') && (IsPathDirectory(path) < 0) &&
        (IsPathAccessible(path) == MagickFalse))
      {
        /*
          Look for image format specification (e.g. ps3:image).
        */
        (void) CopyMagickString(magick,component,(size_t) (p-component+1));
        if (IsMagickConflict(magick) != MagickFalse)
          *magick='\0';
        else
          for (q=component; *q != '\0'; q++)
            *q=(*++p);
        break;
      }
  }
  *subimage='\0';
  p=component;
  if (*p != '\0')
    p=component+strlen(component)-1;
  if ((*p == ']') && (strchr(component,'[') != (char *) NULL) &&
      (IsPathAccessible(path) == MagickFalse))
    {
      /*
        Look for scene specification (e.g. img0001.pcd[4]).
      */
      for (q=p-1; q > component; q--)
        if (*q == '[')
          break;
      if (*q == '[')
        {
          (void) CopyMagickString(subimage,q+1,MaxTextExtent);
          subimage[p-q-1]='\0';
          if ((IsSceneGeometry(subimage,MagickFalse) == MagickFalse) &&
              (IsGeometry(subimage) == MagickFalse))
            *subimage='\0';
          else
            *q='\0';
        }
    }
  p=component;
  if (*p != '\0')
    for (p=component+strlen(component)-1; p > component; p--)
      if (IsBasenameSeparator(*p) != MagickFalse)
        break;
  switch (type)
  {
    case MagickPath:
    {
      (void) CopyMagickString(component,magick,MaxTextExtent);
      break;
    }
    case RootPath:
    {
      for (p=component+(strlen(component)-1); p > component; p--)
      {
        if (IsBasenameSeparator(*p) != MagickFalse)
          break;
        if (*p == '.')
          break;
      }
      if (*p == '.')
        *p='\0';
      break;
    }
    case HeadPath:
    {
      *p='\0';
      break;
    }
    case TailPath:
    {
      if (IsBasenameSeparator(*p) != MagickFalse)
        (void) CopyMagickMemory((unsigned char *) component,
          (const unsigned char *) (p+1),strlen(p+1)+1);
      break;
    }
    case BasePath:
    {
      if (IsBasenameSeparator(*p) != MagickFalse)
        (void) CopyMagickString(component,p+1,MaxTextExtent);
      for (p=component+(strlen(component)-1); p > component; p--)
        if (*p == '.')
          {
            *p='\0';
            break;
          }
      break;
    }
    case ExtensionPath:
    {
      if (IsBasenameSeparator(*p) != MagickFalse)
        (void) CopyMagickString(component,p+1,MaxTextExtent);
      p=component;
      if (*p != '\0')
        for (p=component+strlen(component)-1; p > component; p--)
          if (*p == '.')
            break;
      *component='\0';
      if (*p == '.')
        (void) CopyMagickString(component,p+1,MaxTextExtent);
      break;
    }
    case SubimagePath:
    {
      (void) CopyMagickString(component,subimage,MaxTextExtent);
      break;
    }
    case CanonicalPath:
    case UndefinedPath:
      break;
  }
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  G e t P a t h C o m p o n e n t s                                          %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetPathComponents() returns a list of path components.
%
%  The format of the GetPathComponents method is:
%
%      char **GetPathComponents(const char *path,
%        size_t *number_componenets)
%
%  A description of each parameter follows:
%
%    o path:  Specifies the string to segment into a list.
%
%    o number_components:  return the number of components in the list
%
*/
MagickExport char **GetPathComponents(const char *path,
  size_t *number_components)
{
  char
    **components;

  register const char
    *p,
    *q;

  register ssize_t
    i;

  if (path == (char *) NULL)
    return((char **) NULL);
  *number_components=1;
  for (p=path; *p != '\0'; p++)
    if (IsBasenameSeparator(*p))
      (*number_components)++;
  components=(char **) AcquireQuantumMemory((size_t) *number_components+1UL,
    sizeof(*components));
  if (components == (char **) NULL)
    ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
  p=path;
  for (i=0; i < (ssize_t) *number_components; i++)
  {
    for (q=p; *q != '\0'; q++)
      if (IsBasenameSeparator(*q))
        break;
    components[i]=(char *) AcquireQuantumMemory((size_t) (q-p)+MaxTextExtent,
      sizeof(**components));
    if (components[i] == (char *) NULL)
      ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
    (void) CopyMagickString(components[i],p,(size_t) (q-p+1));
    p=q+1;
  }
  components[i]=(char *) NULL;
  return(components);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  I s P a t h A c c e s s i b l e                                            %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  IsPathAccessible() returns MagickTrue if the file as defined by the path is
%  accessible.
%
%  The format of the IsPathAccessible method is:
%
%      MagickBooleanType IsPathAccessible(const char *path)
%
%  A description of each parameter follows.
%
%    o path:  Specifies a path to a file.
%
*/
MagickExport MagickBooleanType IsPathAccessible(const char *path)
{
  MagickBooleanType
    status;

  struct stat
    attributes;

  if ((path == (const char *) NULL) || (*path == '\0'))
    return(MagickFalse);
  status=GetPathAttributes(path,&attributes);
  if (status == MagickFalse)
    return(status);
  if (S_ISREG(attributes.st_mode) == 0)
    return(MagickFalse);
  if (access_utf8(path,F_OK) != 0)
    return(MagickFalse);
  return(MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
+  I s P a t h D i r e c t o r y                                              %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  IsPathDirectory() returns -1 if the directory does not exist,  1 is returned
%  if the path represents a directory otherwise 0.
%
%  The format of the IsPathDirectory method is:
%
%      int IsPathDirectory(const char *path)
%
%  A description of each parameter follows.
%
%   o  path:  The directory path.
%
*/
static int IsPathDirectory(const char *path)
{
  MagickBooleanType
    status;

  struct stat
    attributes;

  if ((path == (const char *) NULL) || (*path == '\0'))
    return(MagickFalse);
  status=GetPathAttributes(path,&attributes);
  if (status == MagickFalse)
    return(-1);
  if (S_ISDIR(attributes.st_mode) == 0)
    return(0);
  return(1);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   L i s t F i l e s                                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ListFiles() reads the directory specified and returns a list of filenames
%  contained in the directory sorted in ascending alphabetic order.
%
%  The format of the ListFiles function is:
%
%      char **ListFiles(const char *directory,const char *pattern,
%        ssize_t *number_entries)
%
%  A description of each parameter follows:
%
%    o filelist: Method ListFiles returns a list of filenames contained
%      in the directory.  If the directory specified cannot be read or it is
%      a file a NULL list is returned.
%
%    o directory: Specifies a pointer to a text string containing a directory
%      name.
%
%    o pattern: Specifies a pointer to a text string containing a pattern.
%
%    o number_entries:  This integer returns the number of filenames in the
%      list.
%
*/

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

static int FileCompare(const void *x,const void *y)
{
  register const char
    **p,
    **q;

  p=(const char **) x;
  q=(const char **) y;
  return(LocaleCompare(*p,*q));
}

#if defined(__cplusplus) || defined(c_plusplus)
}
#endif

static inline int MagickReadDirectory(DIR *directory,struct dirent *entry,
  struct dirent **result)
{
#if defined(MAGICKCORE_HAVE_READDIR_R)
  return(readdir_r(directory,entry,result));
#else
  (void) entry;
  errno=0;
  *result=readdir(directory);
  return(errno);
#endif
}

MagickExport char **ListFiles(const char *directory,const char *pattern,
  size_t *number_entries)
{
  char
    **filelist;

  DIR
    *current_directory;

  struct dirent
    *buffer,
    *entry;

  size_t
    max_entries;

  /*
    Open directory.
  */
  assert(directory != (const char *) NULL);
  (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",directory);
  assert(pattern != (const char *) NULL);
  assert(number_entries != (size_t *) NULL);
  *number_entries=0;
  current_directory=opendir(directory);
  if (current_directory == (DIR *) NULL)
    return((char **) NULL);
  /*
    Allocate filelist.
  */
  max_entries=2048;
  filelist=(char **) AcquireQuantumMemory((size_t) max_entries,
    sizeof(*filelist));
  if (filelist == (char **) NULL)
    {
      (void) closedir(current_directory);
      return((char **) NULL);
    }
  /*
    Save the current and change to the new directory.
  */
  buffer=(struct dirent *) AcquireMagickMemory(sizeof(*buffer)+
    FILENAME_MAX+1);
  if (buffer == (struct dirent *) NULL)
    ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
  while ((MagickReadDirectory(current_directory,buffer,&entry) == 0) &&
         (entry != (struct dirent *) NULL))
  {
    if (*entry->d_name == '.')
      continue;
    if ((IsPathDirectory(entry->d_name) > 0) ||
#if defined(MAGICKCORE_WINDOWS_SUPPORT)
        (GlobExpression(entry->d_name,pattern,MagickTrue) != MagickFalse))
#else
        (GlobExpression(entry->d_name,pattern,MagickFalse) != MagickFalse))
#endif
      {
        if (*number_entries >= max_entries)
          {
            /*
              Extend the file list.
            */
            max_entries<<=1;
            filelist=(char **) ResizeQuantumMemory(filelist,(size_t)
              max_entries,sizeof(*filelist));
            if (filelist == (char **) NULL)
              break;
          }
#if defined(vms)
        {
          register char
            *p;

          p=strchr(entry->d_name,';');
          if (p)
            *p='\0';
          if (*number_entries > 0)
            if (LocaleCompare(entry->d_name,filelist[*number_entries-1]) == 0)
              continue;
        }
#endif
        filelist[*number_entries]=(char *) AcquireString(entry->d_name);
        (*number_entries)++;
      }
  }
  buffer=(struct dirent *) RelinquishMagickMemory(buffer);
  (void) closedir(current_directory);
  if (filelist == (char **) NULL)
    return((char **) NULL);
  /*
    Sort filelist in ascending order.
  */
  qsort((void *) filelist,(size_t) *number_entries,sizeof(*filelist),
    FileCompare);
  return(filelist);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   M a g i c k D e l a y                                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  MagickDelay() suspends program execution for the number of milliseconds
%  specified.
%
%  The format of the Delay method is:
%
%      void MagickDelay(const MagickSizeType milliseconds)
%
%  A description of each parameter follows:
%
%    o milliseconds: Specifies the number of milliseconds to delay before
%      returning.
%
*/
MagickExport void MagickDelay(const MagickSizeType milliseconds)
{
  if (milliseconds == 0)
    return;
#if defined(MAGICKCORE_HAVE_NANOSLEEP)
  {
    struct timespec
      timer;

    timer.tv_sec=(time_t) (milliseconds/1000);
    timer.tv_nsec=(milliseconds % 1000)*1000*1000;
    (void) nanosleep(&timer,(struct timespec *) NULL);
  }
#elif defined(MAGICKCORE_HAVE_USLEEP)
  usleep(1000*milliseconds);
#elif defined(MAGICKCORE_HAVE_SELECT)
  {
    struct timeval
      timer;

    timer.tv_sec=(long) milliseconds/1000;
    timer.tv_usec=(long) (milliseconds % 1000)*1000;
    (void) select(0,(XFD_SET *) NULL,(XFD_SET *) NULL,(XFD_SET *) NULL,&timer);
  }
#elif defined(MAGICKCORE_HAVE_POLL)
  (void) poll((struct pollfd *) NULL,0,(int) milliseconds);
#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
  Sleep((long) milliseconds);
#elif defined(vms)
  {
    float
      timer;

    timer=milliseconds/1000.0;
    lib$wait(&timer);
  }
#elif defined(__BEOS__)
  snooze(1000*milliseconds);
#else
# error "Time delay method not defined."
#endif
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  M u l t i l i n e C e n s u s                                              %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  MultilineCensus() returns the number of lines within a label.  A line is
%  represented by a \n character.
%
%  The format of the MultilineCenus method is:
%
%      size_t MultilineCensus(const char *label)
%
%  A description of each parameter follows.
%
%   o  label:  This character string is the label.
%
%
*/
MagickExport size_t MultilineCensus(const char *label)
{
  size_t
    number_lines;

  /*
    Determine the number of lines within this label.
  */
  if (label == (char *) NULL)
    return(0);
  for (number_lines=1; *label != '\0'; label++)
    if (*label == '\n')
      number_lines++;
  return(number_lines);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   S h r e a d F i l e                                                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ShredFile() overwrites the specified file with zeros or random data and then
%  removes it.  The overwrite is optional and is only required to help keep
%  the contents of the file private.  On the first pass, the file is zeroed.
%  For subsequent passes, random data is written.
%
%  The format of the ShredFile method is:
%
%      MagickBooleanType ShredFile(const char *path)
%
%  A description of each parameter follows.
%
%    o path:  Specifies a path to a file.
%
*/
MagickPrivate MagickBooleanType ShredFile(const char *path)
{
  char
    *passes;

  ExceptionInfo
    *exception;

  int
    file,
    status;

  MagickSizeType
    length;

  register ssize_t
    i;

  size_t
    quantum;

  struct stat
    file_stats;

  if ((path == (const char *) NULL) || (*path == '\0'))
    return(MagickFalse);
  exception=AcquireExceptionInfo();
  passes=(char *) GetImageRegistry(StringRegistryType,"shred-passes",exception);
  exception=DestroyExceptionInfo(exception);
  if (passes == (char *) NULL)
    passes=GetEnvironmentValue("MAGICK_SHRED_PASSES");
  if (passes == (char *) NULL)
    {
      /*
        Don't shred the file, just remove it.
      */
      status=remove_utf8(path);
      if (status == -1)
        return(MagickFalse);
      return(MagickTrue);
    }
  file=open_utf8(path,O_WRONLY | O_EXCL | O_BINARY,S_MODE);
  if (file == -1)
    {
      /*
        Don't shred the file, just remove it.
      */
      status=remove_utf8(path);
      return(MagickFalse);
    }
  /*
    Shred the file.
  */
  quantum=(size_t) MagickMaxBufferExtent;
  if ((fstat(file,&file_stats) == 0) && (file_stats.st_size != 0))
    quantum=(size_t) MagickMin((MagickSizeType) file_stats.st_size,
      MagickMaxBufferExtent);
  length=(MagickSizeType) file_stats.st_size;
  for (i=0; i < (ssize_t) StringToInteger(passes); i++)
  {
    RandomInfo
      *random_info;

    register MagickOffsetType
      j;

    ssize_t
      count;

    if (lseek(file,0,SEEK_SET) < 0)
      break;
    random_info=AcquireRandomInfo();
    for (j=0; j < (MagickOffsetType) length; j+=count)
    {
      StringInfo
        *key;

      key=GetRandomKey(random_info,quantum);
      if (i == 0)
        ResetStringInfo(key);  /* zero on first pass */
      count=write(file,GetStringInfoDatum(key),(size_t)
        MagickMin(quantum,length-j));
      key=DestroyStringInfo(key);
      if (count <= 0)
        {
          count=0;
          if (errno != EINTR)
            break;
        }
    }
    random_info=DestroyRandomInfo(random_info);
    if (j < (MagickOffsetType) length)
      break;
  }
  status=close(file);
  status=remove_utf8(path);
  if (status == -1)
    return(MagickFalse);
  return(i < (ssize_t) StringToInteger(passes) ? MagickFalse : MagickTrue);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   S y s t e m C o m m a n d                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  SystemCommand() executes the specified command and waits until it
%  terminates.  The returned value is the exit status of the command.
%
%  The format of the SystemCommand method is:
%
%      int SystemCommand(const MagickBooleanType asynchronous,
%        const MagickBooleanType verbose,const char *command,
%        ExceptionInfo *exception)
%
%  A description of each parameter follows:
%
%    o asynchronous: a value other than 0 executes the parent program
%      concurrently with the new child process.
%
%    o verbose: a value other than 0 prints the executed command before it is
%      invoked.
%
%    o command: this string is the command to execute.
%
%    o exception: return any errors here.
%
*/
MagickExport int SystemCommand(const MagickBooleanType asynchronous,
  const MagickBooleanType verbose,const char *command,ExceptionInfo *exception)
{
  char
    **arguments,
    *shell_command;

  int
    number_arguments,
    status;

  PolicyDomain
    domain;

  PolicyRights
    rights;

  register ssize_t
    i;

  status=(-1);
  arguments=StringToArgv(command,&number_arguments);
  if (arguments == (char **) NULL)
    return(status);
  if (*arguments[1] == '\0')
    {
      for (i=0; i < (ssize_t) number_arguments; i++)
        arguments[i]=DestroyString(arguments[i]);
      arguments=(char **) RelinquishMagickMemory(arguments);
      return(-1);
    }
  rights=ExecutePolicyRights;
  domain=DelegatePolicyDomain;
  if (IsRightsAuthorized(domain,rights,arguments[1]) == MagickFalse)
    {
      errno=EPERM;
      (void) ThrowMagickException(exception,GetMagickModule(),PolicyError,
        "NotAuthorized","`%s'",arguments[1]);
      for (i=0; i < (ssize_t) number_arguments; i++)
        arguments[i]=DestroyString(arguments[i]);
      arguments=(char **) RelinquishMagickMemory(arguments);
      return(-1);
    }
  if (verbose != MagickFalse)
    {
      (void) FormatLocaleFile(stderr,"%s\n",command);
      (void) fflush(stderr);
    }
  shell_command=(char *) command;
  if (asynchronous != MagickFalse)
    {
      shell_command=AcquireString(command);
      (void) ConcatenateMagickString(shell_command,"&",MaxTextExtent);
    }
#if defined(MAGICKCORE_POSIX_SUPPORT)
#if !defined(MAGICKCORE_HAVE_EXECVP)
  status=system(shell_command);
#else
  if ((asynchronous != MagickFalse) ||
      (strpbrk(shell_command,"&;<>|") != (char *) NULL))
    status=system(shell_command);
  else
    {
      pid_t
        child_pid;

      /*
        Call application directly rather than from a shell.
      */
      child_pid=(pid_t) fork();
      if (child_pid == (pid_t) -1)
        status=system(command);
      else
        if (child_pid == 0)
          {
            status=execvp(arguments[1],arguments+1);
            _exit(1);
          }
        else
          {
            int
              child_status;

            pid_t
              pid;

            child_status=0;
            pid=(pid_t) waitpid(child_pid,&child_status,0);
            if (pid == -1)
              status=(-1);
            else
              {
                if (WIFEXITED(child_status) != 0)
                  status=WEXITSTATUS(child_status);
                else
                  if (WIFSIGNALED(child_status))
                    status=(-1);
              }
          }
    }
#endif
#elif defined(MAGICKCORE_WINDOWS_SUPPORT)
  status=NTSystemCommand(shell_command);
#elif defined(macintosh)
  status=MACSystemCommand(shell_command);
#elif defined(vms)
  status=system(shell_command);
#else
#  error No suitable system() method.
#endif
  if (status < 0)
    (void) ThrowMagickException(exception,GetMagickModule(),DelegateError,
      "`%s' (%d)",command,status);
  if (shell_command != command)
    shell_command=DestroyString(shell_command);
  for (i=0; i < (ssize_t) number_arguments; i++)
    arguments[i]=DestroyString(arguments[i]);
  arguments=(char **) RelinquishMagickMemory(arguments);
  return(status);
}

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