strspn.c

来自「newos is new operation system」· C语言 代码 · 共 27 行

/* 
** Copyright 2001, Travis Geiselbrecht. All rights reserved.
** Distributed under the terms of the NewOS License.
*/
#include <string.h>
#include <sys/types.h>

size_t
strspn(char const *s, char const *accept)
{
	const char *p;
	const char *a;
	size_t count = 0;

	for(p = s; *p != '\0'; ++p) {
		for(a = accept; *a != '\0'; ++a) {
			if(*p == *a)
				break;
		}
		if(*a == '\0')
			return count;
		++count;
	}

	return count;
}