| 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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