pset6 server giving segfault

Question

When I add the below two blocks I get a segfault when I submit a request from telnet. Actually, I can add just the first and things run fine but upon the second (or even moving the first up above other code) gives the segfault. I assume it has to do with assigning something too large to an array but I can't find it.

// TODO: extract query from request-target
        // Extract request-target
        char requestTarget[] = "";
        int rtLength = strrchr(line, ' ') - strchr(line, ' ');
        strncpy(requestTarget, strchr(line, ' ') + sizeof(char), rtLength);
        requestTarget[rtLength] = '\0';
        printf("This is the request-target: %s\n", requestTarget);
        printf("This is the size of rquestTarget: %d\n", strlen(requestTarget));            

        // Extract query from line
        char query[] = "";
        int qLength = strrchr(line, ' ') - strchr(line, '?');
        strncpy(query, strchr(line, '?') + sizeof(char), qLength);
        query[qLength] = '\0';
        printf("This is the query: %s\n", query);
        printf("This is the size of query: %d\n", strlen(query));   

Answer 1

Remember that you can't change the length of a string array once it has been created in c. Now look at the following:

    char requestTarget[] = "";
    char query[] = "";

This code creates a couple of really short strings that you later try to copy a lot more data into. This is almost certainly causing the seg faults.

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