unix/http/client.c

#define _GNU_SOURCE ///< in order for optarg to be defined
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "shared/http.h"

int main(int argc, char *argv[]) {
    check_opts_number(argc);

    int port = 80;
    char *ofile = NULL;
    char *dir = NULL;
    char *url = NULL;
    int c;

    /// Process the options
    while((c = getopt(argc, argv, "p:o:d:h")) != -1) {
        switch(c) {
            case 'p':
                port = atoi(optarg);
                break;
            case 'o':
                ofile = optarg;
                break;
            case 'd':
                dir = optarg;
                break;
            case 'h':
                printf("Command usage:\n");
                print_usage();
                exit(EXIT_SUCCESS);
                break;
            case '?':
                print_usage();
                exit(EXIT_FAILURE);
            default:
                abort();
        }
    }

    /// Check for the case that both output file and directory are set
    if(ofile != NULL && dir != NULL) {
        printf("Either output file or directory is specified. You cannot use both.\n");
        print_usage();
        exit(EXIT_FAILURE);
    }

    /// Check if the required argument is there
    if(argv[optind] == NULL) {
        fprintf(stderr, "Mandatory argument 'url' missing.\n");
        print_usage();
        exit(EXIT_FAILURE);
    } else {
        url = argv[optind];
    }

    const char *full_url = strstr(url, "http://") + 7; //< the full url starts after http://
    const char *path = strstr(full_url, "/");
}

static void print_usage(void) {
    printf("client [-p PORT] [ -o FILE | -d DIR ] URL\n");
}

/**
 * @brief Function to check the number of arguments
 * @details Checks the number of arguments supplied to the command line.
 *          If the arguments are less than the required or more than possible, it exits
 * @param argc Number of arguments obtained from the command line
 * @return none
 *
 **/
static void check_opts_number(int argc) {
    if(argc <= 1) {
        fprintf(stderr, "At least one argument expected.\n");
        print_usage();
        exit(EXIT_FAILURE);
    } else if(argc > 6) {
        fprintf(stderr, "Too many arguments supplied.\n");
        print_usage();
        exit(EXIT_FAILURE);
    }
}