Two functions working but not when I put them together

Posted by Error_404 on Stack Overflow See other posts from Stack Overflow or by Error_404
Published on 2012-05-31T22:04:01Z Indexed on 2012/05/31 22:40 UTC
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I'm really new to C(I have been learning Cuda and wanted to learn C so I can run everything together instead of generating data in Java/Python and copy/pasting it manually to my Cuda program to play with). I am trying to open a large file(20+gb) and parse some data but because I was having problems I decided to try to break down my problem first to verify I can open and read line by line a file and then in another file take a sample of the output of a line and try to parse it, then if all goes well I can simply bring them together. I managed(after a bit of a struggle) to get each part working but when I combine them together it doesn't work(I tried in both eclipse & QT creator. QT creator says it exited unexpectedly and eclipse just stops..).

Here's the parsing part(it works exactly as I want):

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

int main()
{
    char line[1024] = "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 4],";
    size_t len = strlen(line);
    memmove(line, line+1, len-3);
    line[len-3] = 0;
    printf("%s \n",line);


    char str[100], *s = str, *t = NULL;

    strcpy(str, line);
    while ((t = strtok(s, " ,")) != NULL) {
        s = NULL;
        printf(":%s:\n", t);
    }
    return 0;
}

The data in variable line is exactly as I get if I print each line of a file. But when I copy/paste it into my main program then it doesn't work(QT shows nothing and eclipse just shows the first line). This code is just a few file IO commands that are wrapped around the commands above(everything within the while loop is the exact same as above)

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

int main() {

    char line[1024];
    FILE *fp = fopen("/Users/me/Desktop/output.txt","r");

    printf("Starting.. \n");

    int count = 0;
    int list[30]; //items will be stored here

    while(fgets(line, 1024, fp) != NULL){
        count++;
        //char line[1024] = "[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 4],";
        size_t len = strlen(line);
        memmove(line, line+1, len-3);
        line[len-3] = 0;
        printf("%s \n",line);

        char str[100], *s = str, *t = NULL;

        strcpy(str, line);
        while ((t = strtok(s, " ,")) != NULL) {
            s = NULL;
            printf(":%s:\n", t);
        }
    }
    printf(" num of lines is %i \n", count);
    return 0;
}

eclipse output:

Starting.. 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 4 

I can't figure out what I'm doing wrong. I'm using a mac with gcc 4.2, if that helps. The only thing I can think of is maybe I'm doing something wrong the way I parse the list variable so its not accessible later on(I'm not sure its a wild guess). Is there anything I'm missing?

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