linux-Flexible arrays

Flexible arrays: In a struct defined by C99, the last element allows an array of unknown size (or 0), which does not occupy any memory of the struct, which is called a flexible array, and must have at least one other member before the flexible array.

How to use:

#include <stdio.h>#include<string.h>#include<malloc.h>typedefstruct_flex_array{intLen; Charstr; Charbuff[];} Flex_array;intMainintargcChar**argv) {        Char*info ="This is a flex array!"; intInfo_size =strlen (info); printf ("info_size:%d,struct size:%d\n", Info_size,sizeof(Flex_array)); //info_size:21,struct Size:8Flex_array*p = (Flex_array *)malloc(sizeof(Flex_array) +strlen (info)); P->len =info_size; memcpy (P->buff,info,p->Len); printf ("p:%d,info:%s\n",sizeof(*p),p->buff); //P:8,info:this is a flex array!         Free(P); return 0;}

linux-Flexible arrays