#define _GNU_SOURCE

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <setjmp.h>
#include "readcmd.h"

extern int errno;

struct cmdline *cmd;

int pid_fils;

int main(int argc, char *argv[])
{
    // loop principal
    while (1)
    {
        printf(">>> ");
        cmd = readcmd();

        if (cmd == NULL)
        { // EOF
            break;
        }
        else if (cmd->seq[0] == NULL)
        { // empty
            continue;
        }
        else if (!strcmp(cmd->seq[0][0], "exit"))
        { // "exit"
            break;
        }

        pid_fils = fork();
        if (pid_fils == -1)
        { // fork fail ?
            fprintf(stderr, "ERROR: forking failed, (%d) %s\n", errno, strerror(errno));
            exit(errno);
        }

        if (pid_fils == 0)
        { // instructions du fils
            execvp(cmd->seq[0][0], cmd->seq[0]);
            exit(errno); // si execlp échoue on exit avec une erreur
        }
        else
        { // instructions du père
            int wait_code;
            pid_t id = waitpid(pid_fils, &wait_code, 0); // on attend la fin de l'exec du fils

            if (id == -1)
            { // wait fail ?
                fprintf(stderr, "ERROR: waiting for %d failed, (%d) %s\n", wait_code, errno, strerror(errno));
                exit(errno);
            }

            if (wait_code)
            { // execvp fail ?
                fprintf(stderr, "ERROR: %d's execution failed, (%d) %s\n", pid_fils, wait_code, strerror(wait_code));
            }
        }
    }

    return EXIT_SUCCESS;
}