ref: 5c448c618a89ab8933838da1b5b97ed7c4a42e08
dir: /sys/src/ape/lib/ap/gen/strspn.c/
#include <string.h> #define N 256 size_t strspn(const char *s, const char *b) { char map[N], *os; memset(map, 0, N); while(*b) map[*(unsigned char *)b++] = 1; os = (char*)s; while(map[*(unsigned char *)s++]) ; return s - os - 1; }