42-minishell

while(1)
{
  get_prompt();
  parse_prompt();
  if (fork != NULL)
      wait( NULL);
  else
      execve();
}

allowed external function

Function Name	Library	Description
`readline`	`<readline/readline.h>`	Reads a line from the terminal with editing features.
`rl_clear_history`	`<readline/history.h>`	Clears the readline history list.
`rl_on_new_line`	`<readline/readline.h>`	Informs readline of a new line.
`rl_replace_line`	`<readline/readline.h>`	Replaces the current line in the readline buffer.
`rl_redisplay`	`<readline/readline.h>`	Updates the readline display.
`add_history`	`<readline/history.h>`	Adds a new item to the readline history.
`printf`	`<stdio.h>`	Outputs formatted data to standard output.
`malloc`	`<stdlib.h>`	Allocates specified memory size.
`free`	`<stdlib.h>`	Frees allocated memory.
`write`	`<unistd.h>`	Writes data to a file descriptor.
`access`	`<unistd.h>`	Checks file accessibility.
`open`	`<fcntl.h>`	Opens a file or device.
`read`	`<unistd.h>`	Reads data from a file descriptor.
`close`	`<unistd.h>`	Closes a file descriptor.
`fork`	`<unistd.h>`	Creates a new process.
`wait`	`<sys/wait.h>`	Waits for a child process to end.
`waitpid`	`<sys/wait.h>`	Waits for a specific child process.
`wait3`, `wait4`	`<sys/wait.h>`	Variants of wait with more options.
`signal`	`<signal.h>`	Sets a signal handler.
`sigaction`	`<signal.h>`	Changes a signal action.
`sigemptyset`	`<signal.h>`	Initializes an empty signal set.
`sigaddset`	`<signal.h>`	Adds a signal to a set.
`kill`	`<signal.h>`	Sends a signal to a process.
`exit`	`<stdlib.h>`	Exits the process.
`getcwd`	`<unistd.h>`	Gets the current working directory.
`chdir`	`<unistd.h>`	Changes the working directory.
`stat`, `lstat`, `fstat`	`<sys/stat.h>`	Gets file information.
`unlink`	`<unistd.h>`	Deletes a file.
`execve`	`<unistd.h>`	Executes a program.
`dup`, `dup2`	`<unistd.h>`	Duplicates a file descriptor.
`pipe`	`<unistd.h>`	Creates a pipe.
`opendir`	`<dirent.h>`	Opens a directory stream.
`readdir`	`<dirent.h>`	Reads a directory entry.
`closedir`	`<dirent.h>`	Closes a directory stream.
`strerror`	`<string.h>`	Describes an error number.
`perror`	`<stdio.h>`	Prints an error message.
`isatty`	`<unistd.h>`	Tests if a file descriptor is a terminal.
`ttyname`	`<unistd.h>`	Returns the terminal name.
`ttyslot`	`<unistd.h>`	Finds the utmp slot.
`ioctl`	`<sys/ioctl.h>`	Controls special file parameters.
`getenv`	`<stdlib.h>`	Retrieves an environment value.
`tcsetattr`, `tcgetattr`	`<termios.h>`	Sets/gets terminal attributes.
`tgetent`, `tgetflag`, `tgetnum`, `tgetstr`, `tgoto`, `tputs`	`<term.h>`	Functions for terminal control via the terminfo database.

Minishell Development To-Do List

Basic Shell Features

[x] Display a prompt when waiting for a new command.
[ ] Implement a working history feature.

Command Execution

[x] Search and launch the correct executable based on the PATH variable or using a relative/absolute path.

Signal Handling

[ ] Use only one global variable to indicate a received signal.
[ ] Ensure the global variable only stores the number of the received signal.
[ ] Do not use "norm" type structures in the global scope for signal handling.

Input Parsing and Interpretation

[ ] Do not interpret unclosed quotes or special characters (e.g., \, ;).
[ ] Handle single quotes ('): ignore metacharacters within the quotes.
[ ] Handle double quotes ("): ignore metacharacters except for $ within the quotes.

Redirections

[x] Implement input redirection using <.
[ ] Implement output redirection using >.
[ ] Implement here-document (<<) with a delimiter (do not update history).
[ ] Implement output append redirection using >>.

Pipes

[x] Implement pipe functionality (| character).

Environment Variables and Exit Status

[ ] Handle environment variables expansion ($ followed by characters).
[ ] Handle ? which expands to the exit status of the last executed foreground pipeline.

Special Key Handling (Interactive Mode)

[ ] Handle ctrl-C: display a new prompt on a new line.
[ ] Handle ctrl-D: exit the shell.
[ ] Handle ctrl-\: no action.

Built-in Commands

[ ] Implement echo with -n option.
[x] Implement cd with only a relative or absolute path.
[x] Implement pwd with no options.
[ ] Implement export with no options.
[ ] Implement unset with no options.
[ ] Implement env with no options or arguments.
[ ] Implement exit with no options.

fucalerro / 42-minishell

readme

42-minishell

allowed external function

Minishell Development To-Do List

Basic Shell Features

Command Execution

Signal Handling

Input Parsing and Interpretation

Redirections

Pipes

Environment Variables and Exit Status

Special Key Handling (Interactive Mode)

Built-in Commands