newlib/libc/stdio/snprintf.c

   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  * and/or 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 sprintf.c */
  18 /* This code created by modifying sprintf.c so copyright inherited. */
  19
  20 #include <_ansi.h>
  21 #include <reent.h>
  22 #include <stdio.h>
  23 #include <stdarg.h>
  24 #include <limits.h>
  25 #include <errno.h>
  26 #include "local.h"
  27
  28 int
  29 _snprintf_r (struct _reent *ptr,
  30        char *__restrict str,
  31        size_t size,
  32        const char *__restrict fmt, ...)
  33 {
  34   int ret;
  35   va_list ap;
  36   FILE f;
  37
  38   if (size > INT_MAX)
  39     {
  40       _REENT_ERRNO(ptr) = EOVERFLOW;
  41       return EOF;
  42     }
  43   f._flags = __SWR | __SSTR;
  44   f._flags2 = 0;
  45   f._bf._base = f._p = (unsigned char *) str;
  46   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
  47   f._file = -1;  /* No file. */
  48   va_start (ap, fmt);
  49   ret = _svfprintf_r (ptr, &f, fmt, ap);
  50   va_end (ap);
  51   if (ret < EOF)
  52     _REENT_ERRNO(ptr) = EOVERFLOW;
  53   if (size > 0)
  54     *f._p = 0;
  55   return (ret);
  56 }
  57
  58 #ifdef _NANO_FORMATTED_IO
  59 int
  60 _sniprintf_r (struct _reent *, char *, size_t, const char *, ...)
  61        _ATTRIBUTE ((__alias__("_snprintf_r")));
  62 #endif
  63
  64 #ifndef _REENT_ONLY
  65
  66 int
  67 snprintf (char *__restrict str,
  68        size_t size,
  69        const char *__restrict fmt, ...)
  70 {
  71   int ret;
  72   va_list ap;
  73   FILE f;
  74   struct _reent *ptr = _REENT;
  75
  76   if (size > INT_MAX)
  77     {
  78       _REENT_ERRNO(ptr) = EOVERFLOW;
  79       return EOF;
  80     }
  81   f._flags = __SWR | __SSTR;
  82   f._flags2 = 0;
  83   f._bf._base = f._p = (unsigned char *) str;
  84   f._bf._size = f._w = (size > 0 ? size - 1 : 0);
  85   f._file = -1;  /* No file. */
  86   va_start (ap, fmt);
  87   ret = _svfprintf_r (ptr, &f, fmt, ap);
  88   va_end (ap);
  89   if (ret < EOF)
  90     _REENT_ERRNO(ptr) = EOVERFLOW;
  91   if (size > 0)
  92     *f._p = 0;
  93   return (ret);
  94 }
  95
  96 #ifdef _NANO_FORMATTED_IO
  97 int
  98 sniprintf (char *, size_t, const char *, ...)
  99        _ATTRIBUTE ((__alias__("snprintf")));
 100 #endif
 101 #endif