mailboxbomb/loader/string.c

// Copyright 2008-2009  Segher Boessenkool  <segher@kernel.crashing.org>
// This code is licensed to you under the terms of the GNU GPL, version 2;
// see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt

#include "loader.h"

size_t strlen(const char *s)
{
	size_t len;

	for (len = 0; s[len]; len++)
		;

	return len;
}

size_t strnlen(const char *s, size_t count)
{
	size_t len;

	for (len = 0; s[len] && len < count; len++)
		;

	return len;
}

void *memset(void *b, int c, size_t len)
{
	size_t i;

	for (i = 0; i < len; i++)
		((unsigned char *)b)[i] = c;

	return b;
}

void *memcpy(void *dst, const void *src, size_t len)
{
	size_t i;

	for (i = 0; i < len; i++)
		((unsigned char *)dst)[i] = ((unsigned char *)src)[i];

	return dst;
}

int memcmp(const void *b1, const void *b2, size_t len)
{
	size_t i;

	for (i = 0; i < len; i++) {
		int diff = ((unsigned char *)b1)[i] - ((unsigned char *)b2)[i];
		if (diff)
			return diff;
	}

	return 0;
}