diff options
Diffstat (limited to 'REORG.TODO/string/xpg-strerror.c')
-rw-r--r-- | REORG.TODO/string/xpg-strerror.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/REORG.TODO/string/xpg-strerror.c b/REORG.TODO/string/xpg-strerror.c new file mode 100644 index 0000000000..4a5e59d5ab --- /dev/null +++ b/REORG.TODO/string/xpg-strerror.c @@ -0,0 +1,53 @@ +/* Copyright (C) 1991-2017 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 + <http://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) + { + assert (errnum < 0 || errnum >= _sys_nerr_internal + || _sys_errlist_internal[errnum] == NULL); + return EINVAL; + } + else + { + assert (errnum >= 0 && errnum < _sys_nerr_internal + && _sys_errlist_internal[errnum] != NULL); + + 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; + } +} |