malloc.c

来自「sdcc是为51等小型嵌入式cpu设计的c语言编译器支持数种不同类型的cpu」· C语言 代码 · 共 89 行

/* Simple malloc tests.
 */
#include <testfwk.h>
#include <stdlib.h>
#if defined(SDCC_pic16)
#include <malloc.h>
#endif

xdata char heap[100];

void
testMalloc(void)
{
  void xdata *p1, *p2, *p3;
  char *p;
  unsigned char i;

#if !defined(__GNUC__) && !defined(SDCC_gbz80) && !defined(SDCC_z80)
#if defined(SDCC_pic16)
  _initHeap(heap, sizeof heap);
#else
  init_dynamic_memory((MEMHEADER xdata *)heap, sizeof(heap));
#endif

  p1 = malloc(200);
  ASSERT(p1 == NULL);
  LOG(("p1 == NULL when out of memory\n"));
#ifdef PORT_HOST
  LOG(("p1: %p\n", p1));
#else
  LOG(("p1: %u\n", (unsigned) p1));
#endif
#endif

  p1 = malloc(5);
  ASSERT(p1 != NULL);
#ifdef PORT_HOST
  LOG(("p1: %p\n", p1));
#else
  LOG(("p1: %u\n", (unsigned) p1));
#endif

  p2 = malloc(20);
  ASSERT(p2 != NULL);
#ifdef PORT_HOST
  LOG(("p2: %p\n", p2));
#else
  LOG(("p2: %u\n", (unsigned) p2));
#endif

  p = (char*)p2;
  for (i=0; i<20; i++, p++)
    *p = i;

  p2 = realloc(p2, 25);
  ASSERT(p2 != NULL);
#ifdef PORT_HOST
  LOG(("p2, after expanding realloc: %p\n", p2));
#else
  LOG(("p2, after expanding realloc: %u\n", (unsigned) p2));
#endif

  p = (char*)p2;
  for (i=0; i<20; i++, p++)
    ASSERT(*p == i);

  p2 = realloc(p2, 15);
  ASSERT(p2 != NULL);
#ifdef PORT_HOST
  LOG(("p2, after shrinking realloc: %p\n", p2));
#else
  LOG(("p2, after shrinking realloc: %u\n", (unsigned) p2));
#endif

  p = (char*)p2;
  for (i=0; i<15; i++, p++)
    ASSERT(*p == i);

  free(p2);

  p3 = malloc(10);
  ASSERT(p3 != NULL);
#ifdef PORT_HOST
  LOG(("p3, after freeing p2: %p\n", p3));
#else
  LOG(("p3, after freeing p2: %u\n", (unsigned) p3));
#endif
}