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libiconv 1.16

    1: /* strerror.c --- POSIX compatible system error routine
    2: 
    3:    Copyright (C) 2007-2019 Free Software Foundation, Inc.
    4: 
    5:    This program is free software: you can redistribute it and/or modify
    6:    it under the terms of the GNU General Public License as published by
    7:    the Free Software Foundation; either version 3 of the License, or
    8:    (at your option) any later version.
    9: 
   10:    This program is distributed in the hope that it will be useful,
   11:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13:    GNU General Public License for more details.
   14: 
   15:    You should have received a copy of the GNU General Public License
   16:    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
   17: 
   18: #include <config.h>
   19: 
   20: /* Specification.  */
   21: #include <string.h>
   22: 
   23: #include <errno.h>
   24: #include <stdio.h>
   25: #include <stdlib.h>
   26: #include <string.h>
   27: 
   28: #include "intprops.h"
   29: #include "strerror-override.h"
   30: #include "verify.h"
   31: 
   32: /* Use the system functions, not the gnulib overrides in this file.  */
   33: #undef sprintf
   34: 
   35: char *
   36: strerror (int n)
   37: #undef strerror
   38: {
   39:   static char buf[STACKBUF_LEN];
   40:   size_t len;
   41: 
   42:   /* Cast away const, due to the historical signature of strerror;
   43:      callers should not be modifying the string.  */
   44:   const char *msg = strerror_override (n);
   45:   if (msg)
   46:     return (char *) msg;
   47: 
   48:   msg = strerror (n);
   49: 
   50:   /* Our strerror_r implementation might use the system's strerror
   51:      buffer, so all other clients of strerror have to see the error
   52:      copied into a buffer that we manage.  This is not thread-safe,
   53:      even if the system strerror is, but portable programs shouldn't
   54:      be using strerror if they care about thread-safety.  */
   55:   if (!msg || !*msg)
   56:     {
   57:       static char const fmt[] = "Unknown error %d";
   58:       verify (sizeof buf >= sizeof (fmt) + INT_STRLEN_BOUND (n));
   59:       sprintf (buf, fmt, n);
   60:       errno = EINVAL;
   61:       return buf;
   62:     }
   63: 
   64:   /* Fix STACKBUF_LEN if this ever aborts.  */
   65:   len = strlen (msg);
   66:   if (sizeof buf <= len)
   67:     abort ();
   68: 
   69:   memcpy (buf, msg, len + 1);
   70:   return buf;
   71: }