shitty shim code

build.sh

gcc -dynamiclib -fno-common -o mallshim.dylib mallshim.c

stupidshim.c

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

void (*real_free)(malloc_zone_t *zone, void *ptr);
void (*real_free_definite_size)(malloc_zone_t *zone, void *ptr, size_t size);

void my_free(malloc_zone_t *zone, void *ptr)
{
  char *tmp = ptr;
  char tmp_buf[1025] = {0};
  size_t total = 0;

  while (*tmp != '\0') {
    tmp_buf[total] = *tmp;
    total++;
    if (total == 1024)
      break;
    tmp++;
  }

  malloc_printf("%s\n", tmp_buf);
  real_free(zone, ptr);
}

void my_free_definite_size(malloc_zone_t *zone, void *ptr, size_t size)
{
  char tmp_buf[1024] = {0};

  if (size < 1024) {
    memcpy(tmp_buf, ptr, size);
  } else {
    memcpy(tmp_buf, ptr, 1023);
  }

  malloc_printf("%s\n", tmp_buf);
  real_free_definite_size(zone, ptr, size);
}

void __attribute__((constructor)) my_init() {
  malloc_zone_t *zone = malloc_default_zone();

  real_free = zone->free;
  real_free_definite_size = zone->free_definite_size;

  zone->free_definite_size = my_free_definite_size;
  zone->free = my_free;
}