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53 lines
1 KiB
C
53 lines
1 KiB
C
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#include <limits.h>
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#include <string.h>
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#define BIT_SIZE (CHAR_BIT * sizeof(unsigned long) / sizeof(char))
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char* __cdecl strpbrk(const char *s1, const char *s2)
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{
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if (*s2 == 0)
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{
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return 0;
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}
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if (*(s2+1) == 0)
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{
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return strchr(s1, *s2);
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}
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else if (*(s2+2) == 0)
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{
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char *s3, *s4;
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s3 = strchr(s1, *s2);
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s4 = strchr(s1, *(s2+1));
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if (s3 == 0)
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{
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return s4;
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}
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else if (s4 == 0)
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{
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return s3;
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}
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return s3 < s4 ? s3 : s4;
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}
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else
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{
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unsigned long char_map[(1 << CHAR_BIT) / BIT_SIZE] = {0, };
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const unsigned char* str = (const unsigned char*)s1;
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while (*s2)
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{
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char_map[*(const unsigned char*)s2 / BIT_SIZE] |= (1 << (*(const unsigned char*)s2 % BIT_SIZE));
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s2++;
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}
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while (*str)
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{
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if (char_map[*str / BIT_SIZE] & (1 << (*str % BIT_SIZE)))
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{
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return (char*)((size_t)str);
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}
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str++;
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}
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}
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return 0;
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}
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