shithub: mc

ref: 1779c6b7aedf6bb7665b8f650f37958340f3177c
dir: /lib/std/execvp.myr/

use "alloc"
use "env"
use "errno"
use "fmt"
use "option"
use "strfind"
use "syswrap"

pkg std = 
	const execvp	: (cmd : byte[:], args : byte[:][:] -> errno)
	const execvpe	: (cmd : byte[:], args : byte[:][:], env : byte[:][:] -> errno)
;;

const execvp = {cmd, args
	var i, j, paths, binpath
	var buf : byte[512]

	match strfind(cmd, "/")
	| `Some _:
		-> execv(cmd, args)
	| `None:
		i = 0
		j = 0
		paths = std.getenvv("PATH", "/usr/local/bin:/bin:/usr/bin")
		while j < paths.len
			(i, j) = nextpath(paths, j)
			binpath = bfmt(buf[:], "{}/{}", paths[i:j], cmd)
			execv(binpath, args)
		;;
	;;
	-> -1
}

const execvpe = {cmd, args, env
	var i, j, paths, binpath
	var buf : byte[512]

	match strfind(cmd, "/")
	| `Some _:
		-> execve(cmd, args, env)
	| `None:
		i = 0
		j = 0
		paths = std.getenvv("PATH", "/usr/local/bin:/bin:/usr/bin")
		while j < paths.len
			(i, j) = nextpath(paths, j)
			binpath = bfmt(buf[:], "{}/{}", paths[i:j], cmd)
			execve(binpath, args, env)
		;;
	;;
	-> -1
}

const nextpath = {p, start
	var i, j

	i = start
	while i < p.len && p[i] == (':' : byte)
		i++
	;;
	j = i
	while j < p.len && p[j] != (':' : byte)
		j++
	;;
	-> (i, j)
}