gnulib/lib/c-xvasprintf.c

/* vasprintf with out-of-memory checking in C locale.
   Copyright (C) 1999, 2002-2004, 2006-2026 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 <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include "c-xvasprintf.h"

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "c-vasprintf.h"
#include "xalloc.h"

char *
c_xvasprintf (const char *format, va_list args)
{
  char *result;

  if (c_vaszprintf (&result, format, args) < 0)
    {
      if (errno == ENOMEM)
        xalloc_die ();
      else
        {
          /* The programmer ought to have ensured that none of the other errors
             can occur.  */
          int err = errno;
          char errbuf[20];
          const char *errname;
#if HAVE_WORKING_STRERRORNAME_NP
          errname = strerrorname_np (err);
          if (errname == NULL)
#else
          if (err == EINVAL)
            errname = "EINVAL";
          else if (err == EILSEQ)
            errname = "EILSEQ";
          else if (err == EOVERFLOW)
            errname = "EOVERFLOW";
          else
#endif
            {
              sprintf (errbuf, "%d", err);
              errname = errbuf;
            }
          fprintf (stderr, "c_vasprintf failed! format=\"%s\", errno=%s\n",
                   format, errname);
          fflush (stderr);
          abort ();
        }
    }

  return result;
}