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       strcspn.c - scc - simple c99 compiler
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       ---
       strcspn.c (355B)
       ---
            1 #include <string.h>
            2 
            3 #undef strcspn
            4 
            5 size_t
            6 strcspn(const char *s1, const char *s2)
            7 {
            8         const unsigned char *s = (const unsigned char *) s1;
            9         const unsigned char *reject = (const unsigned char *) s2;
           10         size_t n;
           11         unsigned ch;
           12         char map[__NUMCHARS] = {0};
           13 
           14         while (ch = *reject++)
           15                 map[ch] = 1;
           16 
           17         for (n = 0; (ch = *s++) && !map[ch]; ++n)
           18                 ;
           19 
           20         return n;
           21 }