Question

I would like to read from a .csv file line by line and then check if the first word of my line matches string_1. If it matches, then I would also like to check if the second word matches string_2. My .csv file contains three fields, namely user, password and type.
Here is my code so far:

void verify ( char *user, char *password ) {

    FILE *data;
    char verifyUser[50];

    data = fopen( "password.csv", "r+" );
    while ( fgets(verifyUser, 50, data ) != NULL) {

        char *ptr;
        ptr = strtok(verifyUser, ", ");

        /***What do I do here?***/
    }

    fclose(data);
}

In this case, user and password are string_1 and string_2 respectively. Any tips? Can I use strtok to split my line into three substrings, and then perform strcmp on them? If so, how do I do that?

Answer 1

How about something along these lines:

ptr = strtok(verifyUser, ", ");
if (!ptr || strcmp(ptr, user))
    continue;

/* Okay, so the user matches. */
char *pass = strtok(NULL, ", ");
if (!pass || strcmp(pass, password)) {
    /* Invalid. */
    break;
}

Of course this code assumes you already trust the strings user and password and it’s also untested.