//  Coded by Jeffrey Garcia

//  Everything should work fine, fully supports cd

#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>

void parseline(char *line, char **args) {
        while(*line != '\0') {
                while(*line == ' ' || *line == '\n' || *line == '\t')
                        *line++ = '\0';
                *args++ = line;
                while(*line != ' ' &&  *line != '\n' && *line != '\t' &&
                *line != '\0')
                        line++;
        }
        *args--;
        *args = '\0';
}

void exec(char **args) {
        int pid;

        if((pid = fork()) < 0) {
                printf( "The fork failed.\n");
                exit(1);
        }
        else if(pid > 0) {
                if((strcmp(args[0], "cd") == 0)) {  // || strcmp(args[0], "chdir") == 0 || strcmp(args[0], "dir") == 0)) {

                        if(!(chdir(args[1])==0)) printf("chdir failed.\n");
                }
                wait(NULL);
        }
        else if(pid == 0) {
                if((strcmp(args[0], "cd") == 0)) exit(0);  // || strcmp(args[0], "chdir") == 0 || strcmp(args[0], "dir") == 0)) {
                else if(execvp(args[0], args) < 0) {
                        printf("Exec failed.\n");
                        exit(1);
                }
        }
}

int main() {
        char buffer[256], *cptr;
        char *args[64];

        while(1) {
                printf("[jeffshell]: ");
                cptr = fgets(buffer, 256, stdin);
                parseline(cptr, args);
                if(strcmp(args[0], "exit") == 0) exit(0);
                exec(args);
        }
        return(0);
}