/*
    Extracts sub-sequence (offset, length) with a low end effect
*/
void
get_subsequence(char *fname, int *offset, int *length) {
    char dummy[MAX_LEN];
    FILE *fp;

    /* Open file descriptor */
    fp = fopen(fname, "r");
    if (!fp) {
        fprintf(stderr, "An error occured while trying to extract sub-sequence from file: %s\n", fname);
        exit(0);
    }

    *length = -1;
    *offset = -1;
    while (fscanf(fp, "%s", dummy) != EOF) {
        if (strstr(dummy, "length") && (*length == -1)) {
            fscanf(fp, "%d", length);
        }

        if (strstr(dummy, "offset") && (*offset == -1)) {
            fscanf(fp, "%d", offset);
        }
    }

    /* Close file descriptor */
    fclose(fp);
}