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https://github.com/fluencelabs/musl
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21 lines
528 B
C
21 lines
528 B
C
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#include <string.h>
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#define BITOP(a,b,op) \
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((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a))))
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size_t strcspn(const char *_s, const char *_c)
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{
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const unsigned char *s = _s;
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const unsigned char *c = _c;
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const unsigned char *a = s;
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size_t byteset[32/sizeof(size_t)];
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if (!c[0]) return strlen(s);
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if (!c[1]) return (s=strchr(s, *c)) ? s-a : strlen(a);
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memset(byteset, 0, sizeof byteset);
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for (; *c && BITOP(byteset, *c, |=); c++);
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for (; *s && !BITOP(byteset, *s, &); s++);
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return s-a;
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}
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