/* Return diagnostic string based on error code.

   Copyright (C) 2023-2025 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 "xstrerror.h"

#include <string.h>

#include "xvasprintf.h"

#include "xalloc.h"

#include "gettext.h"

#define _(msgid) dgettext ("gnulib", msgid)

char *

xstrerror (const char *message, int errnum)

{

  /* Get the internationalized description of errnum,

     in a stack-allocated buffer.  */

  const char *errdesc;

  char errbuf[1024];

#if !GNULIB_STRERROR_R_POSIX && STRERROR_R_CHAR_P

  errdesc = strerror_r (errnum, errbuf, sizeof errbuf);

#else

  if (strerror_r (errnum, errbuf, sizeof errbuf) == 0)

    errdesc = errbuf;

  else

    errdesc = NULL;

#endif

  if (errdesc == NULL)

    errdesc = _("Unknown system error");

  if (message != NULL)

    {

      /* Allow e.g. French translators to insert a space before the colon.  */

      char *result = xasprintf (_("%s: %s"), message, errdesc);

      if (result == NULL)

        /* Probably a buggy translation.  Use a safe fallback.  */

        result = xasprintf ("%s%s%s", message, ": ", errdesc);

      return result;

    }

  else

    return xstrdup (errdesc);

}