1  /* Copyright (C) 2007-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library 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 GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library; if not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #include <libintl.h>
      19  #include <locale.h>
      20  #include <stdio.h>
      21  #include <string.h>
      22  #include <tls-internal.h>
      23  
      24  
      25  static const char *
      26  translate (const char *str, locale_t loc)
      27  {
      28    locale_t oldloc = __uselocale (loc);
      29    const char *res = _(str);
      30    __uselocale (oldloc);
      31    return res;
      32  }
      33  
      34  
      35  /* Return a string describing the errno code in ERRNUM.  */
      36  char *
      37  __strerror_l (int errnum, locale_t loc)
      38  {
      39    int saved_errno = errno;
      40    char *err = (char *) __get_errlist (errnum);
      41    if (__glibc_unlikely (err == NULL))
      42      {
      43        struct tls_internal_t *tls_internal = __glibc_tls_internal ();
      44        free (tls_internal->strerror_l_buf);
      45        if (__asprintf (&tls_internal->strerror_l_buf, "%s%d",
      46  		      translate ("Unknown error ", loc), errnum) > 0)
      47  	err = tls_internal->strerror_l_buf;
      48        else
      49  	{
      50  	  /* The memory was freed above.  */
      51  	  tls_internal->strerror_l_buf = NULL;
      52  	  /* Provide a fallback translation.  */
      53  	  err = (char *) translate ("Unknown error", loc);
      54  	}
      55      }
      56    else
      57      err = (char *) translate (err, loc);
      58  
      59    __set_errno (saved_errno);
      60    return err;
      61  }
      62  weak_alias (__strerror_l, strerror_l)
      63  libc_hidden_def (__strerror_l)