diff options
Diffstat (limited to 'zap/src/memcmp.c')
| -rw-r--r-- | zap/src/memcmp.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/zap/src/memcmp.c b/zap/src/memcmp.c new file mode 100644 index 0000000..810bab0 --- /dev/null +++ b/zap/src/memcmp.c @@ -0,0 +1,21 @@ +/* + Copyright 2022 Gabriel Jensen. + This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. + If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/. +*/ + +#include <zap/priv.h> + +#include <stddef.h> + +int_least8_t zap_memcmp(void const * const _lstr,size_t const _num,void const * const _rstr) { + unsigned char const * lpos = (unsigned char const *)_lstr; + unsigned char const * rpos = (unsigned char const *)_rstr; + unsigned char const * const afterlbuf = lpos + _num; + for (;lpos != afterlbuf;++lpos,++rpos) { + unsigned char const lbyte = *lpos; + unsigned char const rbyte = *rpos; + sus_likely (lbyte != rbyte) {return lbyte < rbyte ? (int_least8_t)INT8_MIN : (int_least8_t)INT8_MAX;} + } + return zap_typlit_s8(0x0); +} |