Passing pointer argument by reference under C?

Question

#include 
#include 

void
getstr(char *&retstr)
{
 char *tmp = (char *)malloc(25);
 strcpy(tmp, \"hello,world\");
 retstr = tmp;
}         


        

Answer 1

Try this:

void
getstr(char **retstr)
{
 char *tmp = (char *)malloc(25);
 strcpy(tmp, "hello,world");
 *retstr = tmp;
}

int
main(void)
{
 char *retstr;

 getstr(&retstr);
 printf("%s\n", retstr);

 return 0;
}