Function _cups_safe_vsnprintf

cups/debug.c:354–667

 */

ssize_t					/* O - Number of bytes formatted */
_cups_safe_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 */
		size,			/* Size character (h, l, L) */
		type;			/* Format type character */
  int		width,			/* Width of field */
		prec;			/* Number of characters of precision */
  char		tformat[100],		/* Temporary format string for snprintf() */
		*tptr,			/* Pointer into temporary format */
		temp[1024];		/* Buffer for formatted numbers */
  char		*s;			/* Pointer to string */
  ssize_t	bytes;			/* Total number of bytes needed */


  if (!buffer || bufsize < 2 || !format)
    return (-1);

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

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

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

      if (*format == '%')
      {
        if (bufptr < bufend)
	  *bufptr++ = *format;
        bytes ++;
        format ++;
	continue;
      }
      else if (strchr(" -+#\'", *format))
        *tptr++ = *format++;

      if (*format == '*')
      {
       /*
        * Get width from argument...
	*/

	format ++;
	width = va_arg(ap, int);