Using realloc (X, 0) instead of free() and using malloc with length of a string +1

Question

So I don\'t really know how to put the title this time. First of all I\'d like to say that I\'ve seen several comments on this page about warning if the question is related

Answer 1

If you hope to maintain compatibility, realloc(p,0) is never equivalent to free(p), and zero allocations without subsequent frees are memory leaks plain and simple, even on Linux.

/* leak.c */
#include 
#include 
int main(int argc, char* argv[]) {
    void* p;
    mtrace();
    p = malloc(0x100);
    p = realloc(p, 0);
    exit(EXIT_SUCCESS);
}

$ cc -g leak.c -o leak
$ export MALLOC_TRACE=/tmp/t
$ ./leak
$ mtrace ./leak $MALLOC_TRACE