ref: 71f0f0ddd99a88df4792a6c47bc06f4653231600
dir: /lib/c/src/strcspn.c/
#include <string.h>
#undef strcspn
size_t
strcspn(const char *s1, const char *s2)
{
size_t n;
int c;
const char *p;
for (n = 0; c = *s1++; ++n) {
for (p = s2; *p && *p != c; ++p)
/* nothing */;
if (*p == c)
break;
}
return n;
}