filterURLstring in C

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

void filterURLstring(char *weburl, char **protocol, char **username, char **password, char **host, char **port, char **path);

int main() {
    char *text = "http://mhdfffffjddj:abc123@192.168.0.2:8888/servlet/rece/";
    char *protocol, *username, *password, *host, *port, *path;
    filterURLstring(text, &protocol, &username, &password, &host, &port, &path);
    printf("Protocol:\"%s\"\n", protocol);
    printf("Username:\"%s\"\n", username);
    printf("Password:\"%s\"\n", password);
    printf("Host:\"%s\"\n", host);
    printf("Port:\"%s\"\n", port);
    printf("Path:\"%s\"\n", path);
    free(protocol);
    free(username);
    free(password);
    free(host);
    free(port);
    free(path);
    return 0;
}

void filterURLstring(char *weburl, char **protocol, char **username, char **password, char **host, char **port, char **path) {
    char *postprotocol, *postuserinfo, *postusername, *login, *posthost, *posthostname, *hostloc, *postport;
    int isPath;
    if ((postprotocol = strstr(weburl, "://")) == NULL) {
        printf("Input URL is invalid. Exiting...\n");
        exit(1);
    }
    *protocol = malloc(sizeof(char) * (postprotocol - weburl + 1));
    strncpy(*protocol, weburl, postprotocol - weburl);
    postprotocol = (postprotocol + (*(postprotocol+3)=='/'?4:3));
    if ((postuserinfo = strstr(postprotocol, "@")) != NULL) {
        if ((postusername = strchr(postprotocol, ':')) != NULL) {
            *password = malloc(sizeof(char) * (postuserinfo - postusername + 1));
            strncpy(*password, postusername + 1, (postuserinfo - postusername - 1));
        } else {
            *password = NULL;
        }
        int userlen = (postusername?postusername:postuserinfo) - postprotocol;
        *username = malloc(sizeof(char) *  userlen + 1);
        strncpy(*username, postprotocol, userlen);
    }
    hostloc = (postuserinfo?postuserinfo + 1:postprotocol);
    if ((posthost = strchr(hostloc, '/')) == NULL) {
        posthost = hostloc + strlen(hostloc);
        isPath = 1;
    }
    if ((posthostname = strchr(hostloc, ':')) == NULL) {
        posthostname = posthost;
    }
    *host = malloc(sizeof(char) * (posthostname - hostloc + 1));
    strncpy(*host, hostloc, (posthostname - hostloc));
    if (posthostname != posthost) {
        posthostname++;
        *port = malloc(sizeof(char) * (posthost - posthostname + 1));
        strncpy(*port, posthostname, (posthost - posthostname));
    } else {
        *port = malloc(sizeof(char) * 2 + 1);
        strncpy(*port, "80", 2);
    }
    if (isPath) {
        *path = malloc(sizeof(char) * strlen(posthost));
        strncpy(*path, posthost, strlen(posthost));
    } else {
        *path = calloc(1, 1);
    }
}