1/* See LICENSE file for copyright and license details. */
 2
 3#include <sys/stat.h>
 4
 5#include <stdio.h>
 6#include <stdlib.h>
 7#include <unistd.h>
 8
 9#include "util.h"
10
11static const char *
12getpwd(const char *cwd)
13{
14  const char *pwd;
15  struct stat cst, pst;
16
17  if (!(pwd = getenv("PWD")) || pwd[0] != '/' || stat(pwd, &pst) < 0)
18    return cwd;
19  if (stat(cwd, &cst) < 0)
20    eprintf("stat %s:", cwd);
21
22  return (pst.st_dev == cst.st_dev && pst.st_ino == cst.st_ino) ? pwd : cwd;
23}
24
25static void
26usage(void)
27{
28  eprintf("usage: %s [-LP]\n", argv0);
29}
30
31// ?man pwd: print working directory
32// ?man display the pathname of the current working directory
33int
34main(int argc, char *argv[])
35{
36  char cwd[PATH_MAX];
37  char mode = 'L';
38
39  ARGBEGIN
40  {
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  }
50  ARGEND
51
52  if (!getcwd(cwd, sizeof(cwd)))
53    eprintf("getcwd:");
54  puts((mode == 'L') ? getpwd(cwd) : cwd);
55
56  return fshut(stdout, "<stdout>");
57}