1  /* Formatted output to strings.
       2     Copyright (C) 1999, 2002, 2006-2007 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU Lesser General Public License as published by
       6     the Free Software Foundation; either version 2.1 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  #include <config.h>
      18  
      19  /* Specification.  */
      20  #ifdef IN_LIBASPRINTF
      21  # include "vasprintf.h"
      22  #else
      23  # include <stdio.h>
      24  #endif
      25  
      26  #include <errno.h>
      27  #include <limits.h>
      28  #include <stdlib.h>
      29  
      30  #include "vasnprintf.h"
      31  
      32  /* Some systems, like OSF/1 4.0 and Woe32, don't have EOVERFLOW.  */
      33  #ifndef EOVERFLOW
      34  # define EOVERFLOW E2BIG
      35  #endif
      36  
      37  int
      38  vasprintf (char **resultp, const char *format, va_list args)
      39  {
      40    size_t length;
      41    char *result = vasnprintf (NULL, &length, format, args);
      42    if (result == NULL)
      43      return -1;
      44  
      45    if (length > INT_MAX)
      46      {
      47        free (result);
      48        errno = EOVERFLOW;
      49        return -1;
      50      }
      51  
      52    *resultp = result;
      53    /* Return the number of resulting bytes, excluding the trailing NUL.  */
      54    return length;
      55  }