Function cupsFilePrintf

cups/file.c:1358–1450

 */

int					/* O - Number of bytes written or -1 on error */
cupsFilePrintf(cups_file_t *fp,		/* I - CUPS file */
               const char  *format,	/* I - Printf-style format string */
	       ...)			/* I - Additional args as necessary */
{
  va_list	ap;			/* Argument list */
  ssize_t	bytes;			/* Formatted size */


  DEBUG_printf(("2cupsFilePrintf(fp=%p, format=\"%s\", ...)", (void *)fp, format));

  if (!fp || !format || (fp->mode != 'w' && fp->mode != 's'))
    return (-1);

  if (!fp->printf_buffer)
  {
   /*
    * Start with a 1k printf buffer...
    */

    if ((fp->printf_buffer = malloc(1024)) == NULL)
      return (-1);

    fp->printf_size = 1024;
  }

  va_start(ap, format);
  bytes = vsnprintf(fp->printf_buffer, fp->printf_size, format, ap);
  va_end(ap);

  if (bytes >= (ssize_t)fp->printf_size)
  {
   /*
    * Expand the printf buffer...
    */

    char	*temp;			/* Temporary buffer pointer */


    if (bytes > 65535)
      return (-1);

    if ((temp = realloc(fp->printf_buffer, (size_t)(bytes + 1))) == NULL)
      return (-1);

    fp->printf_buffer = temp;
    fp->printf_size   = (size_t)(bytes + 1);

    va_start(ap, format);
    bytes = vsnprintf(fp->printf_buffer, fp->printf_size, format, ap);
    va_end(ap);
  }

  if (fp->mode == 's')
  {
    if (cups_write(fp, fp->printf_buffer, (size_t)bytes) < 0)
      return (-1);