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  1. /*
  2.  * Copyright (c) 1990, 2007 The Regents of the University of California.
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms are permitted
  6.  * provided that the above copyright notice and this paragraph are
  7.  * duplicated in all such forms and that any documentation,
  8.  * advertising materials, and other materials related to such
  9.  * distribution and use acknowledge that the software was developed
  10.  * by the University of California, Berkeley.  The name of the
  11.  * University may not be used to endorse or promote products derived
  12.  * from this software without specific prior written permission.
  13.  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  14.  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  15.  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  16.  */
  17. /* doc in viprintf.c */
  18.  
  19. #if defined(LIBC_SCCS) && !defined(lint)
  20. static char sccsid[] = "%W% (Berkeley) %G%";
  21. #endif /* LIBC_SCCS and not lint */
  22.  
  23. #include <_ansi.h>
  24. #include <reent.h>
  25. #include <stdio.h>
  26. #include <limits.h>
  27. #include <stdarg.h>
  28. #include <errno.h>
  29.  
  30. #include "local.h"
  31.  
  32. #ifndef _REENT_ONLY
  33.  
  34. int
  35. _DEFUN(vsniprintf, (str, size, fmt, ap),
  36.        char *str        _AND
  37.        size_t size      _AND
  38.        const char *fmt _AND
  39.        va_list ap)
  40. {
  41.   return _vsniprintf_r (_REENT, str, size, fmt, ap);
  42. }
  43.  
  44. #endif /* !_REENT_ONLY */
  45.  
  46. int
  47. _DEFUN(_vsniprintf_r, (ptr, str, size, fmt, ap),
  48.        struct _reent *ptr _AND
  49.        char *str          _AND
  50.        size_t size        _AND
  51.        const char *fmt   _AND
  52.        va_list ap)
  53. {
  54.   int ret;
  55.   FILE f;
  56.  
  57.   if (size > INT_MAX)
  58.     {
  59.       ptr->_errno = EOVERFLOW;
  60.       return EOF;
  61.     }
  62.   f._flags = __SWR | __SSTR;
  63.   f._bf._base = f._p = (unsigned char *) str;
  64.   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
  65.   f._file = -1;  /* No file. */
  66.   ret = _svfiprintf_r (ptr, &f, fmt, ap);
  67.   if (ret < EOF)
  68.     ptr->_errno = EOVERFLOW;
  69.   if (size > 0)
  70.     *f._p = 0;
  71.   return ret;
  72. }
  73.