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