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

char * stralloc (const char * str)
{
	int i,n_char;
	char * s;
	for(n_char=0;str[n_char] != '\0';n_char++);
	s= malloc((n_char+1)*sizeof(char));
	for(i=0;i<n_char;i++)
		s[i] = str[i];
	s[n_char]='\0';
	return s;
}

void strrealloc (char * str_dest, const char * str_src)
{
	if(str_dest != NULL)
	{
		free(str_dest);
		str_dest = NULL;
	}	
	str_dest=stralloc(str_src);	
}

int main(void)
{
	char * str = NULL;
	
	str = stralloc ("un premier texte");
	printf("stralloc: \"%s\"\n",str);
	
	if(str != NULL)
	{
		free(str);
		str=NULL;
	}
	str=stralloc("un texte modifie manuellement");
	printf("stralloc: \"%s\"\n",str);
	
	free(str);
	str = NULL;
	
	str = stralloc ("un premier texte");
	printf("stralloc: \"%s\"\n",str);
	strrealloc(str,"texte modifier avec realloc");
	printf("realloc: \"%s\"\n",str);
	
	
	return EXIT_SUCCESS;
}