/* Copyright (C) 1991-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #include <assert.h> #include <errno.h> #include <stdio.h> #include <string.h> #include <sys/param.h> /* Fill buf with a string describing the errno code in ERRNUM. */ int __xpg_strerror_r (int errnum, char *buf, size_t buflen) { const char *estr = __strerror_r (errnum, buf, buflen); /* We know that __strerror_r returns buf (with a dynamically computed string) if errnum is invalid, otherwise it returns a string whose storage has indefinite extent. */ if (estr == buf) return EINVAL; else { size_t estrlen = strlen (estr); /* Terminate the string in any case. */ if (buflen > 0) *((char *) __mempcpy (buf, estr, MIN (buflen - 1, estrlen))) = '\0'; return buflen <= estrlen ? ERANGE : 0; } }