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fb0a7b9b WJ |
1 | /* |
2 | * Copyright (c) 1988 Regents of the University of California. | |
3 | * 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 | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1988 Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)touch.c 4.8 (Berkeley) 6/1/90"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | /* | |
45 | * Attempt to set the modify date of a file to the current date. If the | |
46 | * file exists, read and write its first character. If the file doesn't | |
47 | * exist, create it, unless -c option prevents it. If the file is read-only, | |
48 | * -f forces chmod'ing and touch'ing. | |
49 | */ | |
50 | #include <sys/types.h> | |
51 | #include <sys/file.h> | |
52 | #include <sys/stat.h> | |
53 | #include <stdio.h> | |
54 | ||
55 | static int dontcreate; /* set if -c option */ | |
56 | static int force; /* set if -f option */ | |
57 | ||
58 | main(argc, argv) | |
59 | int argc; | |
60 | char **argv; | |
61 | { | |
62 | extern int optind; | |
63 | int ch, retval; | |
64 | ||
65 | dontcreate = force = retval = 0; | |
66 | while ((ch = getopt(argc, argv, "cf")) != EOF) | |
67 | switch((char)ch) { | |
68 | case 'c': | |
69 | dontcreate = 1; | |
70 | break; | |
71 | case 'f': | |
72 | force = 1; | |
73 | break; | |
74 | case '?': | |
75 | default: | |
76 | usage(); | |
77 | } | |
78 | if (!*(argv += optind)) | |
79 | usage(); | |
80 | do { | |
81 | retval |= touch(*argv); | |
82 | } while (*++argv); | |
83 | exit(retval); | |
84 | } | |
85 | ||
86 | touch(filename) | |
87 | char *filename; | |
88 | { | |
89 | struct stat statbuffer; | |
90 | ||
91 | if (stat(filename, &statbuffer) == -1) { | |
92 | if (!dontcreate) | |
93 | return(readwrite(filename, 0L)); | |
94 | fprintf(stderr, "touch: %s: does not exist\n", filename); | |
95 | return(1); | |
96 | } | |
97 | if ((statbuffer.st_mode & S_IFMT) != S_IFREG) { | |
98 | fprintf(stderr, "touch: %s: can only touch regular files\n", | |
99 | filename); | |
100 | return(1); | |
101 | } | |
102 | if (!access(filename, R_OK | W_OK)) | |
103 | return(readwrite(filename,statbuffer.st_size)); | |
104 | if (force) { | |
105 | int retval; | |
106 | ||
107 | if (chmod(filename, 0666)) { | |
108 | fprintf(stderr, "touch: %s: couldn't chmod: ", | |
109 | filename); | |
110 | perror((char *)NULL); | |
111 | return(1); | |
112 | } | |
113 | retval = readwrite(filename, statbuffer.st_size); | |
114 | if (chmod(filename, statbuffer.st_mode)) { | |
115 | fprintf(stderr, "touch: %s: couldn't chmod back: ", | |
116 | filename); | |
117 | perror((char *)NULL); | |
118 | return(1); | |
119 | } | |
120 | return(retval); | |
121 | } | |
122 | fprintf(stderr, "touch: %s: cannot touch\n", filename); | |
123 | return(1); | |
124 | } | |
125 | ||
126 | readwrite(filename, size) | |
127 | char *filename; | |
128 | off_t size; | |
129 | { | |
130 | int filedescriptor; | |
131 | char first; | |
132 | off_t lseek(); | |
133 | ||
134 | if (size) { | |
135 | filedescriptor = open(filename, O_RDWR, 0); | |
136 | if (filedescriptor == -1) { | |
137 | error: fprintf(stderr, "touch: %s: ", filename); | |
138 | perror((char *)NULL); | |
139 | return(1); | |
140 | } | |
141 | if (read(filedescriptor, &first, 1) != 1) | |
142 | goto error; | |
143 | if (lseek(filedescriptor, 0L, 0) == -1) | |
144 | goto error; | |
145 | if (write(filedescriptor, &first, 1) != 1) | |
146 | goto error; | |
147 | } else { | |
148 | filedescriptor = creat(filename, 0666); | |
149 | if (filedescriptor == -1) | |
150 | goto error; | |
151 | } | |
152 | if (close(filedescriptor) == -1) | |
153 | goto error; | |
154 | return(0); | |
155 | } | |
156 | ||
157 | usage() | |
158 | { | |
159 | fprintf(stderr, "usage: touch [-cf] file ...\n"); | |
160 | exit(1); | |
161 | } |