Plan 9 from Bell Labs’s /usr/web/sources/patch/ape-erik/strspn.c.orig

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
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#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;
}

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