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pwd.c (90110) pwd.c (90170)
1/*
2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

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37 The Regents of the University of California. All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
43#endif
44static const char rcsid[] =
1/*
2 * Copyright (c) 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 28 unchanged lines hidden (view full) ---

37 The Regents of the University of California. All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
43#endif
44static const char rcsid[] =
45 "$FreeBSD: head/bin/pwd/pwd.c 90110 2002-02-02 06:48:10Z imp $";
45 "$FreeBSD: head/bin/pwd/pwd.c 90170 2002-02-04 07:26:21Z mike $";
46#endif /* not lint */
47
46#endif /* not lint */
47
48#include <sys/types.h>
49#include <sys/stat.h>
50
48#include <err.h>
51#include <err.h>
52#include <errno.h>
49#include <limits.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <unistd.h>
53#include <sys/param.h>
54
53#include <limits.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <unistd.h>
57#include <sys/param.h>
58
59extern char *__progname;
60
61static char *getcwd_logical(void);
55void usage(void);
56
57int
58main(int argc, char *argv[])
59{
62void usage(void);
63
64int
65main(int argc, char *argv[])
66{
67 int Lflag, Pflag;
60 int ch;
61 char *p;
62 char buf[PATH_MAX];
63
68 int ch;
69 char *p;
70 char buf[PATH_MAX];
71
64 /*
65 * Flags for pwd are a bit strange. The POSIX 1003.2B/D9 document
66 * has an optional -P flag for physical, which is what this program
67 * will produce by default. The logical flag, -L, should fail, as
68 * there's no way to display a logical path after forking.
69 */
70 while ((ch = getopt(argc, argv, "P")) != -1)
72 if (strcmp(__progname, "realpath") == 0) {
73 if (argc != 2)
74 usage();
75 if ((p = realpath(argv[1], buf)) == NULL)
76 err(1, "%s", argv[1]);
77 (void)printf("%s\n", p);
78 exit(0);
79 }
80
81 Lflag = Pflag = 0;
82 while ((ch = getopt(argc, argv, "LP")) != -1)
71 switch (ch) {
83 switch (ch) {
84 case 'L':
85 Lflag = 1;
86 break;
72 case 'P':
87 case 'P':
88 Pflag = 1;
73 break;
74 case '?':
75 default:
76 usage();
77 }
78 argc -= optind;
79 argv += optind;
80
89 break;
90 case '?':
91 default:
92 usage();
93 }
94 argc -= optind;
95 argv += optind;
96
81 if (argc == 1) {
82 p = realpath(argv[0], buf);
83 if (p == NULL)
84 err(1, "%s", argv[0]);
85 (void)printf("%s\n", p);
86 } else if (argc == 0) {
87 p = getcwd(NULL, (size_t)0);
88 if (p == NULL)
89 err(1, ".");
90 (void)printf("%s\n", p);
91 } else {
97 if (argc != 0 || (Lflag && Pflag))
92 usage();
98 usage();
93 }
94
99
100 p = Lflag ? getcwd_logical() : getcwd(NULL, 0);
101 if (p == NULL)
102 err(1, ".");
103 (void)printf("%s\n", p);
104
95 exit(0);
96}
97
98void
99usage(void)
100{
101
105 exit(0);
106}
107
108void
109usage(void)
110{
111
102 (void)fprintf(stderr, "usage: pwd\n");
103 exit(1);
112 if (strcmp(__progname, "realpath") == 0)
113 (void)fprintf(stderr, "usage: realpath [path]\n");
114 else
115 (void)fprintf(stderr, "usage: pwd [-L | -P]\n");
116 exit(1);
104}
117}
118
119static char *
120getcwd_logical(void)
121{
122 struct stat log, phy;
123 char *pwd;
124
125 /*
126 * Check that $PWD is an absolute logical pathname referring to
127 * the current working directory.
128 */
129 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') {
130 if (stat(pwd, &log) == -1 || stat(".", &phy) == -1)
131 return (NULL);
132 if (log.st_dev == phy.st_dev && log.st_ino == phy.st_ino)
133 return (pwd);
134 }
135
136 errno = ENOENT;
137 return (NULL);
138}