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23 lines
519 B
C
23 lines
519 B
C
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#include <limits.h>
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#include <string.h>
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size_t _strxspn(const char *s1, const char *s2)
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{
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unsigned char char_map[1 << CHAR_BIT * sizeof(char)];
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const unsigned char * us2 = (const unsigned char *)s2;
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const unsigned char * str = (const unsigned char *)s1;
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memset(char_map, 0, sizeof(char_map));
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for(; *us2; ++ us2)
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char_map[*us2 / CHAR_BIT] |= (1 << (*us2 % CHAR_BIT));
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for(; *str; ++ str)
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if(_x(char_map[*str / CHAR_BIT] & (1 << (*str % CHAR_BIT)))) break;
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return (size_t)str - (size_t)s1;
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}
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/* EOF */
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