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author | Mattias Andrée <maandree@operamail.com> | 2015-09-02 17:30:24 +0200 |
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committer | Mattias Andrée <maandree@operamail.com> | 2015-09-02 17:30:24 +0200 |
commit | d0a041e7e8e5d26b530855dc75f35733b334ee54 (patch) | |
tree | 3df6c47f40bc80e54a662db22c92415dac90a689 /src | |
parent | add prototypes for strcasecmp_l and strncasecmp_l (diff) | |
download | slibc-d0a041e7e8e5d26b530855dc75f35733b334ee54.tar.gz slibc-d0a041e7e8e5d26b530855dc75f35733b334ee54.tar.bz2 slibc-d0a041e7e8e5d26b530855dc75f35733b334ee54.tar.xz |
add ffs functions
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src')
-rw-r--r-- | src/strings/ffs.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/strings/ffs.c b/src/strings/ffs.c new file mode 100644 index 0000000..b0a6481 --- /dev/null +++ b/src/strings/ffs.c @@ -0,0 +1,55 @@ +/** + * 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 <strings.h> + + +/** + * Find the first set bit in an integer. + * + * @param i The integer + * @return The value of the least significant set bit, zero if none. + */ +int ffs(int i) +{ + return __builtin_ffs(i); +} + + +/** + * Find the first set bit in an integer. + * + * @param i The integer + * @return The value of the least significant set bit, zero if none. + */ +int ffsl(long i) +{ + return __builtin_ffsl(i); +} + + +/** + * Find the first set bit in an integer. + * + * @param i The integer + * @return The value of the least significant set bit, zero if none. + */ +int ffsll(long long i) +{ + return __builtin_ffsll(i); +} + |