shithub: scc

ref: 071923624122ae0088073ca68a8dfc65c14c0c7d
dir: /lib/c/strcspn.c/

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#include <string.h>
#undef strcspn

size_t
strcspn(const char *s1, const char *s2)
{
	char buf[__NUMCHARS];
	unsigned char ch;
	size_t n;

	memset(buf, 0, sizeof(buf));
	while (ch = *s2++)
		buf[ch] = 1;

	for (n = 0; (ch = *s1++) && !buf[ch]; ++n)
		;

	return n;
}