kc3-lang/gnulib/lib/vsprintf.c

• Show log

  Commit

• Hash : d60f3b0c
  Author :
  Date : 2011-01-01T20:17:23
  

  maint: update almost all copyright ranges to include 2011
  
  Run the new "make update-copyright" rule.
  

Download

• lib/vsprintf.c

• /* Formatted output to strings.
     Copyright (C) 2004, 2006-2011 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  #ifdef HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  /* Specification.  */
  #include <stdio.h>
  
  #include <errno.h>
  #include <limits.h>
  #include <stdarg.h>
  #include <stdint.h>
  #include <stdlib.h>
  
  #include "vasnprintf.h"
  
  #ifndef SIZE_MAX
  # define SIZE_MAX ((size_t) -1)
  #endif
  
  /* Print formatted output to string STR.
     Return string length of formatted string.  On error, return a negative
     value.  */
  int
  vsprintf (char *str, const char *format, va_list args)
  {
    char *output;
    size_t len;
    size_t lenbuf;
  
    /* vasnprintf fails with EOVERFLOW when the buffer size argument is larger
       than INT_MAX (if that fits into a 'size_t' at all).
       Also note that glibc's iconv fails with E2BIG when we pass a length that
       is so large that str + lenbuf wraps around, i.e.
       (uintptr_t) (str + lenbuf) < (uintptr_t) str.
       Therefore set lenbuf = min (SIZE_MAX, INT_MAX, - (uintptr_t) str - 1).  */
    lenbuf = (SIZE_MAX < INT_MAX ? SIZE_MAX : INT_MAX);
    if (lenbuf > ~ (uintptr_t) str)
      lenbuf = ~ (uintptr_t) str;
  
    output = vasnprintf (str, &lenbuf, format, args);
    len = lenbuf;
  
    if (!output)
      return -1;
  
    if (output != str)
      {
        /* len is near SIZE_MAX.  */
        free (output);
        errno = EOVERFLOW;
        return -1;
      }
  
    if (len > INT_MAX)
      {
        errno = EOVERFLOW;
        return -1;
      }
  
    return len;
  }
  

Download