memchr.c

来自「newos is new operation system」· C语言 代码 · 共 24 行

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

void *
memchr(void const *buf, int c, size_t len)
{
	size_t i;
	unsigned char const *b= buf;
	unsigned char        x= (c&0xff);

	for(i= 0; i< len; i++) {
		if(b[i]== x) {
			return (void*)(b+i);
		}
	}

	return NULL;
}