memset1.c

#include <linux/types.h>
#include <linux/string.h>
//#define SELF_MEM

#ifdef SELF_MEM

void memset1(void *dst,int c, int count){
	int i = 0;
	unsigned char *d = (unsigned char *)dst;
	while(count-- > 0){
		d[i++] = (unsigned char)c;
	}
}



size_t strlen1(const char *s){
	size_t ret = 0;
	while(s[ret++] != '\0')
		;
	return (ret - 1);
}



void *memcpy1(void *to, const void *from, size_t n){
	int i;
	unsigned char *des = (unsigned char *)to;
	unsigned char *src = (unsigned char *)from;
	for(i=0;i<n;++i)
		des[i] = src[i];
	return to;
}
#else
/*
#define memset1 memset
#define strlen1 strlen
#define memcpy1 memcpy
*/
void memset1(void *dst,int c, int count){
	memset(dst, c,  count);
}



size_t strlen1(const char *s){
	return strlen(s);
}



void *memcpy1(void *to, const void *from, size_t n){
	return memcpy(to, from, n);
}

#endif