diff options
Diffstat (limited to 'src/memset_s.c')
| -rw-r--r-- | src/memset_s.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/memset_s.c b/src/memset_s.c new file mode 100644 index 0000000..deda5d7 --- /dev/null +++ b/src/memset_s.c @@ -0,0 +1,48 @@ +/* memset_s.c + * + * Copyright 2024 axtlos <axtlos@disroot.org> + * + * This program 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, version 3. + * + * 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 Lesser General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + * + * SPDX-License-Identifier: LGPL-3.0-only + */ + + +#define __STDC_WANT_LIB_EXT1__ 1 +#include "extlib.h" +#include <errno.h> + + +errno_t +memset_s(void *s, rsize_t smax, int c, rsize_t n) +{ + volatile unsigned char *dest = (unsigned char *) s; + errno_t ret = EINVAL; + rsize_t limit = n < smax ? n : smax; + + if (!s) + throw_constraint_handler_s("memset_s: s = NULL", ret); + else if (n > RSIZE_MAX) + throw_constraint_handler_s("memset_s: n > RSIZE_MAX", ret); + else if (smax > RSIZE_MAX) + throw_constraint_handler_s("memset_s: smax > RSIZE_MAX", ret); + else if (n > smax) + throw_constraint_handler_s("memset_s: n > smax", ret); + else { + while (limit > 0) + dest[--limit] = (unsigned char)c; + ret = 0; + } + return ret; +} + |