toolchain/gcc/newlib/libc/stdio/vsnprintf.c

   1 /* doc in vfprintf.c */
   2
   3 /* This code created by modifying vsprintf.c so copyright inherited. */
   4
   5 /*
   6  * Copyright (c) 1990 The Regents of the University of California.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms are permitted
  10  * provided that the above copyright notice and this paragraph are
  11  * duplicated in all such forms and that any documentation,
  12  * advertising materials, and other materials related to such
  13  * distribution and use acknowledge that the software was developed
  14  * by the University of California, Berkeley.  The name of the
  15  * University may not be used to endorse or promote products derived
  16  * from this software without specific prior written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 #if defined(LIBC_SCCS) && !defined(lint)
  23 static char sccsid[] = "%W% (Berkeley) %G%";
  24 #endif /* LIBC_SCCS and not lint */
  25
  26 #include <_ansi.h>
  27 #include <reent.h>
  28 #include <stdio.h>
  29 #include <limits.h>
  30 #ifdef _HAVE_STDC
  31 #include <stdarg.h>
  32 #else
  33 #include <varargs.h>
  34 #endif
  35
  36 #ifndef _REENT_ONLY
  37
  38 int
  39 _DEFUN (vsnprintf, (str, size, fmt, ap),
  40      char *str _AND
  41      size_t size _AND
  42      _CONST char *fmt _AND
  43      va_list ap)
  44 {
  45   int ret;
  46   FILE f;
  47
  48   f._flags = __SWR | __SSTR;
  49   f._bf._base = f._p = (unsigned char *) str;
  50   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
  51   ret = _vfprintf_r (_REENT, &f, fmt, ap);
  52   if (size > 0)
  53     *f._p = 0;
  54   return ret;
  55 }
  56
  57 #endif /* !_REENT_ONLY */
  58
  59 int
  60 _DEFUN (_vsnprintf_r, (ptr, str, size, fmt, ap),
  61      struct _reent *ptr _AND
  62      char *str _AND
  63      size_t size _AND
  64      _CONST char *fmt _AND
  65      va_list ap)
  66 {
  67   int ret;
  68   FILE f;
  69
  70   f._flags = __SWR | __SSTR;
  71   f._bf._base = f._p = (unsigned char *) str;
  72   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
  73   ret = _vfprintf_r (ptr, &f, fmt, ap);
  74   if (size > 0)
  75     *f._p = 0;
  76   return ret;
  77 }