分段錯誤（核心轉儲）C

我正面臨問題分段錯誤。我知道這與記憶有關。我做了一些更改，但它始終存在錯誤。我正在嘗試讀取一個 25kb 的大檔案。我需要讀取一個最大的 csv 并將其逐行放入 struct 中。我是用鏈表做的。我也已經嘗試過使用串列。如果我在不拆分字串的情況下讀取檔案，我就沒有錯誤。

#include <string.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>



struct gh_user {
    char *id;
    char *login;
    char *type;
    char *createdat;
    char *followers;
    char *followerlist;
    char *following;
    char *followinglist;
    char *public_gists;
    char *pub_repos;
    struct gh_user *next;
};

typedef struct gh_user *GH_USER;

void separador (char *lines, GH_USER k) {

    k->id = strdup(strsep(&lines, ";"));
    k->login = strdup(strsep(&lines, ";"));
    k->type = strdup(strsep(&lines, ";"));
    k->createdat = strdup(strsep(&lines, ";"));
    k->followers = strdup(strsep(&lines, ";"));
    k->followerlist = strdup(strsep(&lines, ";"));
    k->following = strdup(strsep(&lines, ";"));
    k->followinglist = strdup(strsep(&lines, ";"));
    k->public_gists = strdup(strsep(&lines, ";"));
    k->pub_repos = strdup(strsep(&lines, ";"));
    free(lines);
}


int conta_bots()
{
    FILE *usr;
    usr = fopen("../entrada/users.csv","rb");
    
    
    int contador = 0;
    
    char *lines = malloc(1024);
    GH_USER k = malloc(sizeof(struct gh_user));
    int fileSize = 0;

    while (fgets(lines, 1024,usr)!=NULL)
    {  
    
    if(lines != NULL)
    {  
        separador (lines,k->next);
        printf("%s", k->type);
    }
    
    }
    free(k);
    fclose(usr);   
    free(lines);
    
    return contador;
}


int main()
{
    conta_bots();
   
    return 0;
}

uj5u.com熱心網友回復：

如果沒有資料，很難說它到底在哪里崩潰，但是讓我們嘗試修復我可以在不運行代碼的情況下看到的問題：

#include <string.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

struct gh_user {
    char *id;
    char *login;
    char *type;
    char *createdat;
    char *followers;
    char *followerlist;
    char *following;
    char *followinglist;
    char *public_gists;
    char *pub_repos;
    struct gh_user *next;
};

char *n_strdup(char *in) {
    return strdup(in ? in : "");
}

void separador (char *lines, struct gh_user *k) {
    k->id = n_strdup(strsep(&lines, ";"));
    k->login = n_strdup(strsep(&lines, ";"));
    k->type = n_strdup(strsep(&lines, ";"));
    k->createdat = n_strdup(strsep(&lines, ";"));
    k->followers = n_strdup(strsep(&lines, ";"));
    k->followerlist = n_strdup(strsep(&lines, ";"));
    k->following = n_strdup(strsep(&lines, ";"));
    k->followinglist = n_strdup(strsep(&lines, ";"));
    k->public_gists = n_strdup(strsep(&lines, ";"));
    k->pub_repos = n_strdup(strsep(&lines, ";"));
}

/*yes, you need to free all that*/
void gh_user_free(struct gh_user *ptr) {
    if (!ptr) return;
    free(ptr->id);
    free(ptr->login);
    free(ptr->type);
    free(ptr->createdat);
    free(ptr->followers);
    free(ptr->followerlist);
    free(ptr->following);
    free(ptr->followinglist);
    free(ptr->public_gists);
    free(ptr->pub_repos);
    free(ptr);
}


int conta_bots()
{
    FILE *usr;
    usr = fopen("../entrada/users.csv","rb");

    int contador = 0;

    char lines[1024];

    while (fgets(lines, 1024,usr)!=NULL)
    {  
        struct gh_user *k = calloc(1, sizeof(struct gh_user));
        separador (lines,k);
        printf("%s", k->type);
        gh_user_free(k);
    }
    fclose(usr);
    
    return contador; /*possibly that var was supposed to be updated in some way?*/
}


int main()
{
    conta_bots();
    return 0;
}

您的代碼示例沒有使用鏈表，所以我省略了它。

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