source: branches/3.2/mindi-busybox/coreutils/pwd.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 1.7 KB
Line 
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
10//usage:#define pwd_trivial_usage
11//usage:       ""
12//usage:#define pwd_full_usage "\n\n"
13//usage:       "Print the full filename of the current working directory"
14//usage:
15//usage:#define pwd_example_usage
16//usage:       "$ pwd\n"
17//usage:       "/root\n"
18
19#include "libbb.h"
20
21/* This is a NOFORK applet. Be very careful! */
22
23static int logical_getcwd(void)
24{
25    struct stat st1;
26    struct stat st2;
27    char *wd;
28    char *p;
29
30    wd = getenv("PWD");
31    if (!wd || wd[0] != '/')
32        return 0;
33
34    p = wd;
35    while (*p) {
36        /* doing strstr(p, "/.") by hand is smaller and faster... */
37        if (*p++ != '/')
38            continue;
39        if (*p != '.')
40            continue;
41        /* we found "/.", skip to next char */
42        p++;
43        if (*p == '.')
44            p++; /* we found "/.." */
45        if (*p == '\0' || *p == '/')
46            return 0; /* "/./" or "/../" component: bad */
47    }
48
49    if (stat(wd, &st1) != 0)
50        return 0;
51    if (stat(".", &st2) != 0)
52        return 0;
53    if (st1.st_ino != st2.st_ino)
54        return 0;
55    if (st1.st_dev != st2.st_dev)
56        return 0;
57
58    puts(wd);
59    return 1;
60}
61
62int pwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
63int pwd_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
64{
65    char *buf;
66
67    if (ENABLE_DESKTOP) {
68        /* TODO: assume -L if $POSIXLY_CORRECT? (coreutils does that)
69         * Rationale:
70         * POSIX requires a default of -L, but most scripts expect -P
71         */
72        unsigned opt = getopt32(argv, "LP");
73        if ((opt & 1) && logical_getcwd())
74            return fflush_all();
75    }
76
77    buf = xrealloc_getcwd_or_warn(NULL);
78
79    if (buf) {
80        puts(buf);
81        free(buf);
82        return fflush_all();
83    }
84
85    return EXIT_FAILURE;
86}
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