0x16. C - Simple Shell

     _____       _                     __    _____ _          _ _ 
    / ____|     | |                   / _|  / ____| |        | | |
   | |  __  __ _| |_ ___  ___    ___ | |_  | (___ | |__   ___| | |
   | | |_ |/ _` | __/ _ \/ __|  / _ \|  _|  \___ \| '_ \ / _ \ | |
   | |__| | (_| | ||  __/\__ \ | (_) | |    ____) | | | |  __/ | |
    \_____|\__,_|\__\___||___/  \___/|_|   |_____/|_| |_|\___|_|_|

The Gates of Shell by Spencer Cheng, featuring Julien Barbier

Resource

List of allowed functions and system calls

access (man 2 access)
chdir (man 2 chdir)
close (man 2 close)
closedir (man 3 closedir)
execve (man 2 execve)
exit (man 3 exit)
\_exit (man 2 _exit)
fflush (man 3 fflush)
fork (man 2 fork)
free(man 3 free)
getcwd (man 3 getcwd)
getline (man 3 getline)
getpid (man 2 getpid)
isatty (man 3 isatty)
kill (man 2 kill)
malloc (man 3 malloc)
open (man 2 open)
opendir (man 3 opendir)
perror (man 3 perror)
read (man 2 read)
readdir (man 3 readdir)
signal (man 2 signal)
stat (__xstat) (man 2 stat)
lstat (__lxstat) (man 2 lstat)
fstat (__fxstat) (man 2 fstat)
strtok (man 3 strtok)
wait (man 2 wait)
waitpid (man 2 waitpid)
wait3 (man 2 wait3)
wait4 (man 2 wait4)
write (man 2 write)

The shell will be compiled this way:

$ gcc -Wall -Werror -Wextra -pedantic -std=gnu89 \*.c -o hsh

Output

Unless specified otherwise, your program must have the exact same output as sh (/bin/sh) as well as the exact same error output.
The only difference is when you print an error, the name of the program must be equivalent to your argv[0] (see below)

Example of error with sh:

$ echo "qwerty" | /bin/sh
/bin/sh: 1: qwerty: not found
$ echo "qwerty" | /bin/../bin/sh
/bin/../bin/sh: 1: qwerty: not found
$

Same error with your program hsh:

$ echo "qwerty" | ./hsh
./hsh: 1: qwerty: not found
$ echo "qwerty" | ./././hsh
./././hsh: 1: qwerty: not found
$

Testing

The shell should work like this in interactive mode:

$ ./hsh
($) /bin/ls
hsh main.c shell.c
($)
($) exit
$

But also in non-interactive mode:

$ echo "/bin/ls" | ./hsh
hsh main.c shell.c test\_ls\_2
$
$ cat test\_ls\_2
/bin/ls
/bin/ls
$
$ cat test\_ls\_2 | ./hsh
hsh main.c shell.c test\_ls\_2
hsh main.c shell.c test\_ls\_2
$

Features

To add as we progress

Builtins

To add as we progress

Authors

Winny Didine Ineza 👾