ref: 2a03ed80e4fc52c327e47e1749c97b4e2c1aa1d8
dir: /sys/src/libc/port/strcspn.c/
#include <u.h> #include <libc.h> #define N 256 long strcspn(char *s, char *b) { char map[N], *os; memset(map, 0, N); for(;;) { map[*(uchar*)b] = 1; if(*b++ == 0) break; } os = s; while(map[*(uchar*)s++] == 0) ; return s - os - 1; }