root/test-line-buffer.c

DEFINITIONS

1. strtouint32
2. handle_command
3. handle_line
4. main

/*
 * test-line-buffer.c: code to exercise the svn importer's input helper
 */

#include "git-compat-util.h"
#include "strbuf.h"
#include "vcs-svn/line_buffer.h"

static uint32_t strtouint32(const char *s)
{
        char *end;
        uintmax_t n = strtoumax(s, &end, 10);
        if (*s == '\0' || *end != '\0')
                die("invalid count: %s", s);
        return (uint32_t) n;
}

static void handle_command(const char *command, const char *arg, struct line_buffer *buf)
{
        switch (*command) {
        case 'b':
                if (starts_with(command, "binary ")) {
                        struct strbuf sb = STRBUF_INIT;
                        strbuf_addch(&sb, '>');
                        buffer_read_binary(buf, &sb, strtouint32(arg));
                        fwrite(sb.buf, 1, sb.len, stdout);
                        strbuf_release(&sb);
                        return;
                }
        case 'c':
                if (starts_with(command, "copy ")) {
                        buffer_copy_bytes(buf, strtouint32(arg));
                        return;
                }
        case 's':
                if (starts_with(command, "skip ")) {
                        buffer_skip_bytes(buf, strtouint32(arg));
                        return;
                }
        default:
                die("unrecognized command: %s", command);
        }
}

static void handle_line(const char *line, struct line_buffer *stdin_buf)
{
        const char *arg = strchr(line, ' ');
        if (!arg)
                die("no argument in line: %s", line);
        handle_command(line, arg + 1, stdin_buf);
}

int main(int argc, char *argv[])
{
        struct line_buffer stdin_buf = LINE_BUFFER_INIT;
        struct line_buffer file_buf = LINE_BUFFER_INIT;
        struct line_buffer *input = &stdin_buf;
        const char *filename;
        char *s;

        if (argc == 1)
                filename = NULL;
        else if (argc == 2)
                filename = argv[1];
        else
                usage("test-line-buffer [file | &fd] < script");

        if (buffer_init(&stdin_buf, NULL))
                die_errno("open error");
        if (filename) {
                if (*filename == '&') {
                        if (buffer_fdinit(&file_buf, strtouint32(filename + 1)))
                                die_errno("error opening fd %s", filename + 1);
                } else {
                        if (buffer_init(&file_buf, filename))
                                die_errno("error opening %s", filename);
                }
                input = &file_buf;
        }

        while ((s = buffer_read_line(&stdin_buf)))
                handle_line(s, input);

        if (filename && buffer_deinit(&file_buf))
                die("error reading from %s", filename);
        if (buffer_deinit(&stdin_buf))
                die("input error");
        if (ferror(stdout))
                die("output error");
        return 0;
}