C - 段错误 : 11

Question

嗨，我必须为我的大学进行磁盘模拟。

我有 2 个文件:

tttfs.h:

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>

typedef struct _disk disk;
typedef struct _block block;

struct _block{
    uint8_t *unBlock;
};

struct _disk{
    int id;
    block *diskBlock;
};

tfs_create.c:

#include "tttfs.h"

uint8_t little[4];

int tttfs_create(int size, char *name);
void inttolitend(uint32_t x, uint8_t* lit_int);

int main(){
    tttfs_create(7, "disk.tfs");
}

int tttfs_create(int size, char *name){
    FILE *f = NULL;
    if ((f = fopen(name, "wb"))!=NULL)
    {
    disk *d = malloc(sizeof(disk));
    d->diskBlock = malloc(1024);
    d->id = 1;
    int i;
    for(i = 0; i<size; i++){
       printf("%d\n", i);
       d->diskBlock[i].unBlock = malloc(1024); //I got the segmentation fault here
    }
    inttolitend(size, little);
    for(i = 0; i<4; i++){
       d->diskBlock[0].unBlock[i] = little[i];
    }
    for(i = 0; i<size; i++){
       fwrite(&d->diskBlock[i],1024,1,f);
    }
    }
    else
        printf("Erreur\n\n");
    return 0;
}

void inttolitend(uint32_t x, uint8_t* lit_int){
   lit_int[3] = (uint8_t)x / (256*256*256);
   lit_int[2] = (uint8_t)(x % (256*256*256)) / (256*256);
   lit_int[1] = (uint8_t)((x % (256*256*256)) % (256*256)) / 256;
   lit_int[0] = (uint8_t)((x % (256*256*256)) % (256*256)) % 256;
}

我想在文件中写入多个 block (此处为 7)，因此我对磁盘结构的大小进行 malloc，然后对 diskBlock 进行 malloc 以创建表 d->diskBlock[0].unBlock = malloc(1024);但不是为了更多。我怎样才能用我的结构做一个 block [size]？ (我不太擅长c)

Answer 1

我认为你应该改变这一行

d->diskBlock = malloc(1024);

至

d->diskBlock = malloc(sizeof(block) * size);

<小时/>

还有，这个

d->diskBlock[i].unBlock = malloc(1024);

至

d->diskBlock[i].unBlock = malloc(sizeof(uint8_t) * 4);