C 动态分配内存
malloc 和 free
void *malloc(size_t size);
void free(void *pointer);
calloc 和 realloc
void *calloc(size_t num_elements, size_t elements_size);
void realloc(void *ptr, size_t new_size);
1
2 /*
3 * alloc.h
4 *
5 * 定义一个不易发生错误的内存分配器
6 */
7
8 #include <stdlib.h>
9
10 #define malloc
11 #define MALLOC(num,type) (type *)alloc((num) * sizeof(type))
12
13 void *alloc(size_t size);
14
2 /*
3 * alloc.h
4 *
5 * 定义一个不易发生错误的内存分配器
6 */
7
8 #include <stdlib.h>
9
10 #define malloc
11 #define MALLOC(num,type) (type *)alloc((num) * sizeof(type))
12
13 void *alloc(size_t size);
14
/*
* alloc.c
*
* 不易发生错误的内存分配器的实现
*/
#include <stdio.h>
#include "alloc.h"
#undef malloc
void *alloc(size_t size)
{
void *new_mem;
new_mem = malloc(size);
if(new_mem == NULL)
{
printf("Out of memory!\n");
exit(1);
}
return new_mem;
}
* alloc.c
*
* 不易发生错误的内存分配器的实现
*/
#include <stdio.h>
#include "alloc.h"
#undef malloc
void *alloc(size_t size)
{
void *new_mem;
new_mem = malloc(size);
if(new_mem == NULL)
{
printf("Out of memory!\n");
exit(1);
}
return new_mem;
}