1/* See LICENSE file for copyright and license details. */
 2
 3
 4#include <sys/stat.h>
 5
 6#include <stdio.h>
 7#include <stdlib.h>
 8#include <unistd.h>
 9
10#include "util.h"
11
12static const char *
13getpwd(const char *cwd)
14{
15	const char *pwd;
16	struct stat cst, pst;
17
18	if (!(pwd = getenv("PWD")) || pwd[0] != '/' || stat(pwd, &pst) < 0)
19		return cwd;
20	if (stat(cwd, &cst) < 0)
21		eprintf("stat %s:", cwd);
22
23	return (pst.st_dev == cst.st_dev && pst.st_ino == cst.st_ino) ? pwd : cwd;
24}
25
26static void
27usage(void)
28{
29	eprintf("usage: %s [-LP]\n", argv0);
30}
31
32// ?man pwd: print working directory
33// ?man display the pathname of the current working directory
34int
35main(int argc, char *argv[])
36{
37	char cwd[PATH_MAX];
38	char mode = 'L';
39
40	ARGBEGIN {
41	// ?man -L: specify option flag
42	case 'L':
43	// ?man -P: specify option flag
44	case 'P':
45		mode = ARGC();
46		break;
47	default:
48		usage();
49	} ARGEND
50
51	if (!getcwd(cwd, sizeof(cwd)))
52		eprintf("getcwd:");
53	puts((mode == 'L') ? getpwd(cwd) : cwd);
54
55	return fshut(stdout, "<stdout>");
56}