问线程总线错误

EN

#include <pthread.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#define _XOPEN_SOURCE
#define MAXLINE 40
#define MAXPASS 9

/* dictionary search thread function */
void * dictionary(void * argv)
{
    /* initializing SALT */
    char salt[3];               // defining salt (length is always 2 chars + "\0")
    strncpy(salt, argv, 2);     // copying the first 2 characters from encrypted password to salt
    salt[2] = '\0';             // placing null character to make salt a string

    /* defining and initializing password */
    char password[14];
    strcpy(password, argv);
    /* defining candidate */
    char  candidate[MAXPASS];

    /* opening file */
    FILE *fp;
    if ((fp = fopen("/usr/share/dict/words", "r")) == NULL)
    {
        printf("Error: Can not open file.\n");
        return (void *) -1;
    }
    printf("Open file: Ok\n");
    char line[MAXLINE];
    printf("Counting words: "); 
    /* counting words the file contains */
    int ctr = 0;    // words counter variable 
    int len;        // store length of the current line
    while (fgets(line, MAXLINE, fp) != NULL && line[0] != '\n')
    {
        if ((len = strlen(line)) <= MAXPASS && len >= 4)
            ctr++;  // will be real+1 when the loop ends
    }
    ctr--;          // adjusting to real words count
    rewind(fp);     // go back to the beginning of file
    printf("%d words\n", ctr);

    /* create an array of strings and fill it with the words from the dictionary */
    printf("Creating array for file contents: ");
    char words[ctr][MAXPASS];
    int i = 0;      // loop counter variable
    printf("Ok\n");
    /************************************* BUS ERROR *********************************************/
    printf("Reading file contents: ");
    while (fgets(line, MAXLINE, fp) != NULL && line[0] != '\n')
    {
        if ((len = strlen(line)) <= MAXPASS && len >= 4)
        {
            line[len-1] = '\0';
            strcpy(words[i], line);
            printf("%d: %s\n", i, words[i]);
            i++;
        }
    }
    printf("Ok\n");
    printf("Loaded %d words...\n", ctr);

    /* closing file */
    printf("Close file: ");
    if (fclose(fp) != 0)
    {
        fprintf(stderr, "Error: Can not close file\n");
        return (void *) -2;
    }
    printf("Ok\n");

    /* starting search dictionary search */
    printf("Starting Dictionary Search...\n");
    int match = 0;
    char * encrypted;
    int n;
    for (i = 0; i <= ctr && !match; i++)
    {
        encrypted = crypt(words[i], salt);
        if ((strcmp(encrypted, password)) == 0)             // if candidate == password
        {
            match = 1;
            strcpy(candidate, words[i]);
            printf("Password: %s\n", candidate);
            return (void *) 1;
        }
    }

    return (void *) 0;
}
int main(int argc, char * argv[])
{
    /* if there are less/more than 1 argument, notify the user and exit with an error code  1 */
    if (argc != 2)      // first argument is always the name of the program
    {
        printf("Error 1: Wrong number of arguments\n");             
        return 1;
    }
    /* if the length of the argument is less/more than 13 characters, notify the user and exit with an error code 2 */
    int length = strlen(argv[1]);
    if (length != 13)
    {
        printf("Error 2: The length of an encrypted password should be 13 characters\n");
        return 2;
    }

    pthread_t dct;      // dictionary thread identifier
    void *status;       // thread return value

    /* creating dictionary thread */
    pthread_create(&dct,NULL,dictionary,argv[1]);

    printf("Waiting for thread to terminate...\n");
    pthread_join(dct,&status);

    //printf("Return Value: %d\n",(int)status);

    return 0;
}