/home/dko/projects/mobilec/trunk/src/mxml-2.2.2/mxml-string.c

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/*
 * "$Id: mxml-string.c,v 1.1 2007/05/23 20:43:28 david_ko Exp $"
 *
 * String functions for Mini-XML, a small XML-like file parsing library.
 *
 * Copyright 2003-2005 by Michael Sweet.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Contents:
 *
 *   mxml_strdup()    - Duplicate a string.
 *   mxml_strdupf()   - Format and duplicate a string.
 *   mxml_vsnprintf() - Format a string into a fixed size buffer.
 */

/*
 * Include necessary headers...
 */

#include "config.h"


/*
 * 'mxml_strdup()' - Duplicate a string.
 */

#ifndef HAVE_STRDUP
char    *                               /* O - New string pointer */
mxml_strdup(const char *s)              /* I - String to duplicate */
{
  char  *t;                             /* New string pointer */


  if (s == NULL)
    return (NULL);

  if ((t = malloc(strlen(s) + 1)) == NULL)
    return (NULL);

  return (strcpy(t, s));
}
#endif /* !HAVE_STRDUP */


/*
 * 'mxml_strdupf()' - Format and duplicate a string.
 */

char *                                  /* O - New string pointer */
mxml_strdupf(const char *format,        /* I - Printf-style format string */
             va_list    ap)             /* I - Pointer to additional arguments */
{
  int   bytes;                          /* Number of bytes required */
  char  *buffer,                        /* String buffer */
        temp[256];                      /* Small buffer for first vsnprintf */


 /*
  * First format with a tiny buffer; this will tell us how many bytes are
  * needed...
  */

  bytes = mxml_vsnprintf(temp, sizeof(temp), format, ap);

  if (bytes < sizeof(temp))
  {
   /*
    * Hey, the formatted string fits in the tiny buffer, so just dup that...
    */

    return (strdup(temp));
  }

 /*
  * Allocate memory for the whole thing and reformat to the new, larger
  * buffer...
  */

  if ((buffer = calloc(1, bytes + 1)) != NULL)
    mxml_vsnprintf(buffer, bytes + 1, format, ap);

 /*
  * Return the new string...
  */

  return (buffer);
}


/*
 * 'mxml_vsnprintf()' - Format a string into a fixed size buffer.
 */

int                                     /* O - Number of bytes formatted */
mxml_vsnprintf(char       *buffer,      /* O - Output buffer */
               size_t     bufsize,      /* O - Size of output buffer */
               const char *format,      /* I - Printf-style format string */
               va_list    ap)           /* I - Pointer to additional arguments */
{
  char          *bufptr,                /* Pointer to position in buffer */
                *bufend,                /* Pointer to end of buffer */
                sign,                   /* Sign of format width */
                size,                   /* Size character (h, l, L) */
                type;                   /* Format type character */
  const char    *bufformat;             /* Start of format */
  int           width,                  /* Width of field */
                prec;                   /* Number of characters of precision */
  char          tformat[100],           /* Temporary format string for sprintf() */
                temp[1024];             /* Buffer for formatted numbers */
  char          *s;                     /* Pointer to string */
  int           slen;                   /* Length of string */
  int           bytes;                  /* Total number of bytes needed */


 /*
  * Loop through the format string, formatting as needed...
  */

  bufptr = buffer;
  bufend = buffer + bufsize - 1;
  bytes  = 0;

  while (*format)
  {
    if (*format == '%')
    {
      bufformat = format;
      format ++;

      if (*format == '%')
      {
        *bufptr++ = *format++;
        continue;
      }
      else if (strchr(" -+#\'", *format))
        sign = *format++;
      else
        sign = 0;

      width = 0;
      while (isdigit(*format))
        width = width * 10 + *format++ - '0';

      if (*format == '.')
      {
        format ++;
        prec = 0;

        while (isdigit(*format))
          prec = prec * 10 + *format++ - '0';
      }
      else
        prec = -1;

      if (*format == 'l' && format[1] == 'l')
      {
        size = 'L';
        format += 2;
      }
      else if (*format == 'h' || *format == 'l' || *format == 'L')
        size = *format++;

      if (!*format)
        break;

      type = *format++;

      switch (type)
      {
        case 'E' : /* Floating point formats */
        case 'G' :
        case 'e' :
        case 'f' :
        case 'g' :
            if ((format - bufformat + 1) > sizeof(tformat) ||
                (width + 2) > sizeof(temp))
              break;

            strncpy(tformat, bufformat, format - bufformat);
            tformat[format - bufformat] = '\0';

            sprintf(temp, tformat, va_arg(ap, double));

            bytes += strlen(temp);

            if (bufptr)
            {
              if ((bufptr + strlen(temp)) > bufend)
              {
                strncpy(bufptr, temp, bufend - bufptr);
                bufptr = bufend;
                break;
              }
              else
              {
                strcpy(bufptr, temp);
                bufptr += strlen(temp);
              }
            }
            break;

        case 'B' : /* Integer formats */
        case 'X' :
        case 'b' :
        case 'd' :
        case 'i' :
        case 'o' :
        case 'u' :
        case 'x' :
            if ((format - bufformat + 1) > sizeof(tformat) ||
                (width + 2) > sizeof(temp))
              break;

            strncpy(tformat, bufformat, format - bufformat);
            tformat[format - bufformat] = '\0';

            sprintf(temp, tformat, va_arg(ap, int));

            bytes += strlen(temp);

            if (bufptr)
            {
              if ((bufptr + strlen(temp)) > bufend)
              {
                strncpy(bufptr, temp, bufend - bufptr);
                bufptr = bufend;
                break;
              }
              else
              {
                strcpy(bufptr, temp);
                bufptr += strlen(temp);
              }
            }
            break;
            
        case 'p' : /* Pointer value */
            if ((format - bufformat + 1) > sizeof(tformat) ||
                (width + 2) > sizeof(temp))
              break;

            strncpy(tformat, bufformat, format - bufformat);
            tformat[format - bufformat] = '\0';

            sprintf(temp, tformat, va_arg(ap, void *));

            bytes += strlen(temp);

            if (bufptr)
            {
              if ((bufptr + strlen(temp)) > bufend)
              {
                strncpy(bufptr, temp, bufend - bufptr);
                bufptr = bufend;
                break;
              }
              else
              {
                strcpy(bufptr, temp);
                bufptr += strlen(temp);
              }
            }
            break;

        case 'c' : /* Character or character array */
            bytes += width;

            if (bufptr)
            {
              if (width <= 1)
                *bufptr++ = va_arg(ap, int);
              else
              {
                if ((bufptr + width) > bufend)
                  width = bufend - bufptr;

                memcpy(bufptr, va_arg(ap, char *), width);
                bufptr += width;
              }
            }
            break;

        case 's' : /* String */
            if ((s = va_arg(ap, char *)) == NULL)
              s = "(null)";

            slen = strlen(s);
            if (slen > width && prec != width)
              width = slen;

            bytes += width;

            if (bufptr)
            {
              if ((bufptr + width) > bufend)
                width = bufend - bufptr;

              if (slen > width)
                slen = width;

              if (sign == '-')
              {
                strncpy(bufptr, s, slen);
                memset(bufptr + slen, ' ', width - slen);
              }
              else
              {
                memset(bufptr, ' ', width - slen);
                strncpy(bufptr + width - slen, s, slen);
              }

              bufptr += width;
            }
            break;

        case 'n' : /* Output number of chars so far */
            if ((format - bufformat + 1) > sizeof(tformat) ||
                (width + 2) > sizeof(temp))
              break;

            strncpy(tformat, bufformat, format - bufformat);
            tformat[format - bufformat] = '\0';

            sprintf(temp, tformat, va_arg(ap, int));

            bytes += strlen(temp);

            if (bufptr)
            {
              if ((bufptr + strlen(temp)) > bufend)
              {
                strncpy(bufptr, temp, bufend - bufptr);
                bufptr = bufend;
                break;
              }
              else
              {
                strcpy(bufptr, temp);
                bufptr += strlen(temp);
              }
            }
            break;
      }
    }
    else
    {
      bytes ++;

      if (bufptr && bufptr < bufend)
        *bufptr++ = *format++;
    }
  }

 /*
  * Nul-terminate the string and return the number of characters needed.
  */

  *bufptr = '\0';

  return (bytes);
}



/*
 * End of "$Id: mxml-string.c,v 1.1 2007/05/23 20:43:28 david_ko Exp $".
 */

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