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author | Mattias Andrée <maandree@operamail.com> | 2015-11-17 03:58:53 +0100 |
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committer | Mattias Andrée <maandree@operamail.com> | 2015-11-17 03:58:53 +0100 |
commit | 32da28619e84abb2da6e6088848b1fc9c66a9a6a (patch) | |
tree | 5047eae7a92e33d18b431ecfc79b56a5695d7bc4 /src/string/memrchr.c | |
parent | strcasecmp, strncasecmp, strcasecmp_l, and strncasecmp_l are implemented in src/string/ rather than src/strings/ (diff) | |
download | slibc-32da28619e84abb2da6e6088848b1fc9c66a9a6a.tar.gz slibc-32da28619e84abb2da6e6088848b1fc9c66a9a6a.tar.bz2 slibc-32da28619e84abb2da6e6088848b1fc9c66a9a6a.tar.xz |
split strstr.c and strchr.c
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/string/memrchr.c')
-rw-r--r-- | src/string/memrchr.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/string/memrchr.c b/src/string/memrchr.c new file mode 100644 index 0000000..7325049 --- /dev/null +++ b/src/string/memrchr.c @@ -0,0 +1,46 @@ +/** + * slibc — Yet another C library + * Copyright © 2015 Mattias Andrée (maandree@member.fsf.org) + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * 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 General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <string.h> + + +# pragma GCC diagnostic ignored "-Wdiscarded-qualifiers" + + + +/** + * Find the last occurrence of a byte in a memory segment. + * + * For improved performace, use this function instead + * of `strrchr` if you already know the length of the + * string. + * + * @param segment The memory segment to search. + * @param c The sought after character. + * @param size The size of the memory segment. + * @return Pointer to the last occurrence of `c`, + * `NULL` if none were found. + */ +void* (memrchr)(const void* segment, int c, size_t size) +{ + char* s = segment; + while (size--) + if (s[size] == c) + return s + size; + return NULL; +} + |