LXR toybox/toys/posix/pwd.c

   1/* pwd.c - Print working directory.
   2 *
   3 * Copyright 2006 Rob Landley <rob@landley.net>
   4 *
   5 * See http://opengroup.org/onlinepubs/9699919799/utilities/pwd.html
   6
   7USE_PWD(NEWTOY(pwd, ">0LP[-LP]", TOYFLAG_BIN))
   8
   9config PWD
  10  bool "pwd"
  11  default y
  12  help
  13    usage: pwd [-L|-P]
  14
  15    Print working (current) directory.
  16
  17    -L  Use shell's path from $PWD (when applicable)
  18    -P  Print canonical absolute path
  19*/
  20
  21#define FOR_pwd
  22#include "toys.h"
  23
  24void pwd_main(void)
  25{
  26  char *s, *pwd = getcwd(0, 0), *PWD;
  27
  28  // Only use $PWD if it's an absolute path alias for cwd with no "." or ".."
  29  if (!(toys.optflags & FLAG_P) && (s = PWD = getenv("PWD"))) {
  30    struct stat st1, st2;
  31
  32    while (*s == '/') {
  33      if (*(++s) == '.') {
  34        if (s[1] == '/' || !s[1]) break;
  35        if (s[1] == '.' && (s[2] == '/' || !s[2])) break;
  36      }
  37      while (*s && *s != '/') s++;
  38    }
  39    if (!*s && s != PWD) s = PWD;
  40    else s = NULL;
  41
  42    // If current directory exists, make sure it matches.
  43    if (s && pwd)
  44        if (stat(pwd, &st1) || stat(PWD, &st2) || st1.st_ino != st2.st_ino ||
  45            st1.st_dev != st2.st_dev) s = NULL;
  46  } else s = NULL;
  47
  48  // If -L didn't give us a valid path, use cwd.
  49  if (!s && !(s = pwd)) perror_exit("xgetcwd");
  50
  51  xprintf("%s\n", s);
  52
  53  if (CFG_TOYBOX_FREE) free(pwd);
  54}
  55