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       memchr.c - scc - simple c99 compiler
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       ---
       memchr.c (197B)
       ---
            1 #include <string.h>
            2 
            3 #undef memchr
            4 
            5 void *
            6 memchr(const void *s, int c, size_t n)
            7 {
            8         unsigned char *bp = (unsigned char *) s;
            9 
           10         while (n > 0 && *bp++ != c)
           11                 --n;
           12         return (n == 0) ? NULL : bp-1;
           13 }