blob: 05dee497be028c9b8a1172419c32f49f0700d25c
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Mini pwd implementation for busybox |
| 4 | * |
| 5 | * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>. |
| 6 | * |
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 8 | */ |
| 9 | //config:config PWD |
| 10 | //config: bool "pwd" |
| 11 | //config: default y |
| 12 | //config: help |
| 13 | //config: pwd is used to print the current directory. |
| 14 | |
| 15 | //applet:IF_PWD(APPLET_NOFORK(pwd, pwd, BB_DIR_BIN, BB_SUID_DROP, pwd)) |
| 16 | |
| 17 | //kbuild:lib-$(CONFIG_PWD) += pwd.o |
| 18 | |
| 19 | //usage:#define pwd_trivial_usage |
| 20 | //usage: "" |
| 21 | //usage:#define pwd_full_usage "\n\n" |
| 22 | //usage: "Print the full filename of the current working directory" |
| 23 | //usage: |
| 24 | //usage:#define pwd_example_usage |
| 25 | //usage: "$ pwd\n" |
| 26 | //usage: "/root\n" |
| 27 | |
| 28 | #include "libbb.h" |
| 29 | |
| 30 | static int logical_getcwd(void) |
| 31 | { |
| 32 | struct stat st1; |
| 33 | struct stat st2; |
| 34 | char *wd; |
| 35 | char *p; |
| 36 | |
| 37 | wd = getenv("PWD"); |
| 38 | if (!wd || wd[0] != '/') |
| 39 | return 0; |
| 40 | |
| 41 | p = wd; |
| 42 | while (*p) { |
| 43 | /* doing strstr(p, "/.") by hand is smaller and faster... */ |
| 44 | if (*p++ != '/') |
| 45 | continue; |
| 46 | if (*p != '.') |
| 47 | continue; |
| 48 | /* we found "/.", skip to next char */ |
| 49 | p++; |
| 50 | if (*p == '.') |
| 51 | p++; /* we found "/.." */ |
| 52 | if (*p == '\0' || *p == '/') |
| 53 | return 0; /* "/./" or "/../" component: bad */ |
| 54 | } |
| 55 | |
| 56 | if (stat(wd, &st1) != 0) |
| 57 | return 0; |
| 58 | if (stat(".", &st2) != 0) |
| 59 | return 0; |
| 60 | if (st1.st_ino != st2.st_ino) |
| 61 | return 0; |
| 62 | if (st1.st_dev != st2.st_dev) |
| 63 | return 0; |
| 64 | |
| 65 | puts(wd); |
| 66 | return 1; |
| 67 | } |
| 68 | |
| 69 | int pwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 70 | int pwd_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| 71 | { |
| 72 | char *buf; |
| 73 | |
| 74 | if (ENABLE_DESKTOP) { |
| 75 | /* TODO: assume -L if $POSIXLY_CORRECT? (coreutils does that) |
| 76 | * Rationale: |
| 77 | * POSIX requires a default of -L, but most scripts expect -P |
| 78 | */ |
| 79 | unsigned opt = getopt32(argv, "LP"); |
| 80 | if ((opt & 1) && logical_getcwd()) |
| 81 | return fflush_all(); |
| 82 | } |
| 83 | |
| 84 | buf = xrealloc_getcwd_or_warn(NULL); |
| 85 | |
| 86 | if (buf) { |
| 87 | puts(buf); |
| 88 | free(buf); |
| 89 | return fflush_all(); |
| 90 | } |
| 91 | |
| 92 | return EXIT_FAILURE; |
| 93 | } |
| 94 |