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author | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
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committer | Rich Felker <dalias@aerifal.cx> | 2011-02-12 00:22:29 -0500 |
commit | 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 (patch) | |
tree | 6eaef0d8a720fa3da580de87b647fff796fe80b3 /src/string/strcspn.c | |
download | musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.gz musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.bz2 musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.tar.xz musl-0b44a0315b47dd8eced9f3b7f31580cf14bbfc01.zip |
initial check-in, version 0.5.0v0.5.0
Diffstat (limited to 'src/string/strcspn.c')
-rw-r--r-- | src/string/strcspn.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/string/strcspn.c b/src/string/strcspn.c new file mode 100644 index 00000000..439b7be4 --- /dev/null +++ b/src/string/strcspn.c @@ -0,0 +1,20 @@ +#include <string.h> + +#define BITOP(a,b,op) \ + ((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a)))) + +size_t strcspn(const char *_s, const char *_c) +{ + const unsigned char *s = _s; + const unsigned char *c = _c; + const unsigned char *a = s; + size_t byteset[32/sizeof(size_t)]; + + if (!c[0]) return strlen(s); + if (!c[1]) return (s=strchr(s, *c)) ? s-a : strlen(a); + + memset(byteset, 0, sizeof byteset); + for (; *c && BITOP(byteset, *c, |=); c++); + for (; *s && !BITOP(byteset, *s, &); s++); + return s-a; +} |