ref: b9656ec7e120d1fced20ea5ca826c57f2de4fc84
dir: /lib/std/execvp.myr/
use "alloc" use "env" use "errno" use "option" use "strfind" use "syswrap" use "slcp" 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 = mkpath(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 = mkpath(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) } const mkpath = {buf, path, bin var p, b p = path.len b = bin.len if buf.len < p + b + 1 -> "" ;; std.slcp(buf[:p], path) std.slcp(buf[p:p + 1], "/") std.slcp(buf[p + 1:p + b + 1], bin) -> buf[:p + b + 1] }