Re: Issues with memcpy

[Javier Valencia <jvalencia@xxxxxxxxx>]

Finally i've understood the point, but, why in the first example the 
output is "clean" and in the second example is printing the "empty" 
stuff if the code is the same for the static buffer?

Thanks

I've attached the modified examples

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct
{
	char ctype;
	int itype;
	int itype2;
} t_st;

int main()
{
	int a;
	char buffer[sizeof(t_st)];
	t_st mystruct;
	
	mystruct.ctype = 5;
	mystruct.itype = 5;
	mystruct.itype2 = 5;
	
	bzero(buffer, sizeof(t_st));
	
	memcpy(buffer, (char*)&mystruct, sizeof(t_st));
	
	for(a=0; a<sizeof(t_st); a++)
		printf("%x ", buffer[a]);
	printf("\n");

	
	return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct
{
	char ctype;
	int itype;
	int itype2;
} t_st;

int main()
{
	int a;
	char buffer[sizeof(t_st)];
	char *buffer2;
	t_st mystruct;
	
	mystruct.ctype = 5;
	mystruct.itype = 5;
	mystruct.itype2 = 5;
	
	bzero(buffer, sizeof(t_st));
	
	memcpy(buffer, (char*)&mystruct, sizeof(t_st));
	
	for(a=0; a<sizeof(t_st); a++)
		printf("%x ", buffer[a]);
	printf("\n");

	buffer2 = (char*)malloc(sizeof(char)*sizeof(t_st));
	bzero(buffer2, sizeof(t_st));
	
	memcpy(buffer2, (char*)&mystruct, sizeof(t_st));
	
	for(a=0; a<sizeof(t_st); a++)
		printf("%x ", buffer2[a]);
	printf("\n");

	return 0;
}