Created allowed.txt to track allowed functions for minishell and updated AGENTS.md to tell codex to not use any forbidden functions, also updated AGENTS.md to add all builtins changes

AGENTS.md

@@ -2,6 +2,7 @@
 
 ## Project Structure & Module Organization
 - `src/` holds the shell implementation, with submodules for `builtins/`, `executor/`, `parser/`, and `variables/`.
+- `src/builtins/` currently includes: `cd`, `echo`, `env`, `exit`, `export`, `pwd`, `unset`.
 - `include/` contains public headers used across modules.
 - `lib/` is populated at build time with third-party 42 libraries (libft, get_next_line, ft_printf, ft_args).
 - `docs/` stores project references and manual test notes (see `docs/tests.md`).
@@ -19,11 +20,23 @@
 - The codebase follows 42 **Norminette v4** rules. Run `norminette *.c *.h` (or on specific files) before submitting changes.
 - Keep file names lowercase with underscores (e.g., `src/builtins/echo/echo.c`).
 - Keep headers in `include/` and expose only what modules need.
+- Before adding or changing code, check `allowed.txt` to know which functions are permitted.
+- Any function not listed in `allowed.txt` is not allowed in this project.
 
 ## Testing Guidelines
 - There is no automated test runner. Use manual checks in `docs/tests.md` and basic shell behavior checks (pipes, redirects, builtins).
+- A local builtin edge-case script exists at `tests/builtins_edge_cases.sh` (expects a compiled `./minishell`).
 - When debugging memory issues, run under valgrind and use the suppression file in `valgrind/readline.supp`.
 
+## Builtins Status
+- `cd`: handles `HOME` fallback, `cd -` via `OLDPWD`, updates `PWD`/`OLDPWD`, and returns failure on invalid usage (`too many arguments`, missing `HOME`/`OLDPWD`).
+- `echo`: supports repeated `-n` flags (`-n`, `-nnn`) and prints remaining args preserving spaces between tokens.
+- `env`: prints current environment as `KEY=VALUE`; returns failure when called with extra arguments.
+- `exit`: validates numeric argument (with overflow checks), returns `1` on `too many arguments` without exiting, and exits with `2` on non-numeric argument.
+- `export`: supports `NAME=VALUE` and `NAME` (stored as empty value), validates identifiers, and returns failure when any identifier is invalid.
+- `pwd`: prints working directory using dynamic `getcwd` and returns failure if `getcwd` fails.
+- `unset`: validates identifiers and removes matching variables from the environment map.
+
 ## Commit & Pull Request Guidelines
 - Commit messages in this repo use a simple `type: summary` format (examples: `update: ...`, `fix: ...`). Keep summaries short and specific.
 - For PRs, include:

allowed.txt

@@ -0,0 +1,177 @@
+[minishell_allowed]
+readline
+rl_clear_history
+rl_on_new_line
+rl_replace_line
+rl_redisplay
+add_history
+printf
+malloc
+free
+write
+access
+open
+read
+close
+fork
+wait
+waitpid
+wait3
+wait4
+signal
+sigaction
+sigemptyset
+sigaddset
+kill
+exit
+getcwd
+chdir
+stat
+lstat
+fstat
+unlink
+execve
+dup
+dup2
+pipe
+opendir
+readdir
+closedir
+strerror
+perror
+isatty
+ttyname
+ttyslot
+ioctl
+getenv
+tcsetattr
+tcgetattr
+tgetent
+tgetflag
+tgetnum
+tgetstr
+tgoto
+tputs
+
+[libft]
+ft_atoi
+ft_atoi_base
+ft_atol
+ft_bzero
+ft_calloc
+ft_cdlstadd_back
+ft_cdlstadd_front
+ft_cdlstclear
+ft_cdlstdelone
+ft_cdlstiter
+ft_cdlstlast
+ft_cdlstmap
+ft_cdlstnew
+ft_cdlstsize
+ft_clstadd_back
+ft_clstadd_front
+ft_clstclear
+ft_clstdelone
+ft_clstiter
+ft_clstlast
+ft_clstmap
+ft_clstnew
+ft_clstsize
+ft_dlstadd_back
+ft_dlstadd_front
+ft_dlstclear
+ft_dlstdelone
+ft_dlstiter
+ft_dlstlast
+ft_dlstmap
+ft_dlstnew
+ft_dlstsize
+ft_eputchar
+ft_eputendl
+ft_eputnbr
+ft_eputstr
+ft_free
+ft_free_split
+ft_hashmap_clear
+ft_hashmap_clear_keys
+ft_hashmap_contains_key
+ft_hashmap_entries
+ft_hashmap_get
+ft_hashmap_hashstr
+ft_hashmap_new
+ft_hashmap_put
+ft_hashmap_remove
+ft_hashmap_strcmp
+ft_hashstr
+ft_iabs
+ft_imin
+ft_isalnum
+ft_isalpha
+ft_isascii
+ft_iscntrl
+ft_isdigit
+ft_islower
+ft_isprint
+ft_isspace
+ft_isupper
+ft_itoa
+ft_itoa_base
+ft_lstadd_back
+ft_lstadd_front
+ft_lstclear
+ft_lstclear_nodes
+ft_lstdelone
+ft_lstiter
+ft_lstlast
+ft_lstmap
+ft_lstnew
+ft_lstsize
+ft_ltoa
+ft_memchr
+ft_memcmp
+ft_memcpy
+ft_memmove
+ft_memset
+ft_nsplit
+ft_pow
+ft_putchar
+ft_putchar_fd
+ft_putendl
+ft_putendl_fd
+ft_putnbr
+ft_putnbr_fd
+ft_putstr
+ft_putstr_fd
+ft_realloc
+ft_split
+ft_strchr
+ft_strcmp
+ft_strdup
+ft_strisnum
+ft_striteri
+ft_strjoin
+ft_strlcat
+ft_strlcpy
+ft_strlen
+ft_strmapi
+ft_strncmp
+ft_strncpy
+ft_strnjoin
+ft_strnstr
+ft_strrchr
+ft_strtrim
+ft_substr
+ft_swap
+ft_tolower
+ft_toupper
+ft_uitoa
+ft_uitoa_base
+ft_ultoa_base
+
+[get_next_line]
+get_next_line
+
+[ft_printf]
+ft_eprintf
+ft_fprintf
+ft_printf