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初次提交，包含c语言实现的，cirbuff和varray

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forbelief 2016-11-20 23:31:59 -08:00
commit 64ad5e515e
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78
c/varray/varray.c Normal file
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/*
* varray.c - 动态数组的实现
*
*/
#include <malloc.h>
#include <string.h>
#include "varray.h"
// #define CLEAR_FREE_MEM
bool varray_init(varray_t *varray, uint32_t bsize)
{
struct varray_inside *va_in = (struct varray_inside *)varray;
va_in->bsize = bsize;
if ((va_in->buff = (uint8_t *)malloc(va_in->bsize)) == NULL)
{
return 0;
}
va_in->size = va_in->bsize;
#ifdef CLEAR_FREE_MEM
memset(va_in->buff, 0, va_in->size);
#endif /* CLEAR_FREE_MEM */
return 1;
}
bool check_varray(varray_t *varray, uint32_t req_size)
{
uint8_t *new_buff = NULL;
uint32_t new_size = 0;
struct varray_inside *va_in = (struct varray_inside *)varray;
if (req_size <= va_in->size)
return 1;
// 确定要分配空间的大小
new_size = (req_size % va_in->bsize == 0) ?
req_size : (req_size / va_in->bsize + 1) * va_in->bsize;
if ((new_buff = (uint8_t *)realloc(va_in->buff, new_size)) == NULL)
return 0;
if (va_in->buff != new_buff)
free(va_in->buff);
va_in->buff = new_buff;
#ifdef CLEAR_FREE_MEM
memset(&va_in->buff[va_in->size], 0, new_size - va_in->size);
#endif /* CLEAR_FREE_MEM */
va_in->size = new_size;
return 1;
}
void destory_varray(varray_t *varray)
{
struct varray_inside *va_in = (struct varray_inside *)varray;
if (va_in->buff != NULL)
{
free(va_in->buff);
va_in->buff = NULL;
}
va_in->size = 0;
va_in->bsize = 0;
return;
}