c - strcpy 给我段错误

Question

我的代码给我带来了段错误。我调试了一下，执行strcpy时出现错误。该代码尝试从文本文件中提取数据并将其存储到结构数组中。我计划使用 strcpy 将文本文件的数据存储到结构中。知道为什么会发生这种情况吗？

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int input( char *s, int length);

void main(){

    char *tok;
    char *buffer;
    size_t bufsize = 32;
    size_t characters;
    FILE *f;
    char *file_name;
    char line[255];
    int currentRoom;
    int count = 0;
    typedef struct {
        char room_n;
        char description[100];
        char room_north;
        char room_south;
        char room_west;
        char room_east;
    } room;

    //Creating an array of structs
    room record[1000];
    while(1){

        buffer = (char *)malloc(bufsize * sizeof(char));


        if(buffer == NULL){
            perror("Unable to allocate buffer");
            exit(1);
        }
        printf("Enter a command: ");
        characters = getline(&buffer, &bufsize, stdin);

        if(strcmp(buffer,"exit\n") == 0){
            printf("Exiting...\n");
            exit(1);
        }

        tok = strtok(buffer, " \n"); // Tokenize input
        printf("%s is the token \n", tok);


        if (strcmp(tok,"loaddungeon") == 0){
            file_name = strtok(NULL, "\n");
            printf("file name : %s \n", file_name);
            f = fopen(file_name,"r");
            while (fgets(line, sizeof(line), f) != NULL)
                {

                    char val1[128];
                    char val2[128];
                    char val3[128];
                    char val4[128];
                    char val5[128];
                    char val6[128];

                    strcpy(val1, strtok(line, "$"));
                    strcpy(val2, strtok(NULL, "$"));
                    strcpy(val3, strtok(NULL, " "));
                    strcpy(val4, strtok(NULL, " "));
                    strcpy(val5, strtok(NULL, " "));
                    strcpy(val6, strtok(NULL, " "));

                    //Segmentation fault error occurs here
                    strcpy(record[count].room_n, val1);

Answer 1

strcpy()的定义是:

char *strcpy(char *dest, const char *src)

哪里-

• dest -- 这是指向目标数组的指针内容要复制。

• src -- 这是要复制的字符串。

在您的代码中，传递给 strcpy() 的参数是 char 和 char * :

strcpy(record[count].room_n, val1);

如结构中所定义:

typedef struct {
        char room_n;  //room_n declared as 'char'
        char description[100];
        char room_north;
        char room_south;
        char room_west;
        char room_east;
    } room;

建议:

为room_n分配指向的内存。将声明更改为char room_n[128];