ref: 8e212d00e17c23b79489215d6cc41da22381a550
dir: /lib/c/string/strspn.c/
#include <string.h> #undef strspn size_t strspn(const char *s1, const char *s2) { const unsigned char *s = s1; const unsigned char *accept = s2; unsigned ch; size_t n; char buf[__NUMCHARS]; memset(buf, 0, sizeof(buf)); while (ch = *accept++) buf[ch] = 1; for (n = 0; (ch = *s++) && buf[ch]; ++n) ; return n; }