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1.1 root 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 are permitted
6: * provided that: (1) source distributions retain this entire copyright
7: * notice and comment, and (2) distributions including binaries display
8: * the following acknowledgement: ``This product includes software
9: * developed by the University of California, Berkeley and its contributors''
10: * in the documentation or other materials provided with the distribution
11: * and in all advertising materials mentioning features or use of this
12: * software. Neither the name of the University nor the names of its
13: * contributors may be used to endorse or promote products derived
14: * from this software without specific prior written permission.
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18: */
19:
20: #ifndef lint
21: char copyright[] =
22: "@(#) Copyright (c) 1988 Regents of the University of California.\n\
23: All rights reserved.\n";
24: #endif /* not lint */
25:
26: #ifndef lint
27: static char sccsid[] = "@(#)touch.c 4.8 (Berkeley) 6/1/90";
28: #endif /* not lint */
29:
30: /*
31: * Attempt to set the modify date of a file to the current date. If the
32: * file exists, read and write its first character. If the file doesn't
33: * exist, create it, unless -c option prevents it. If the file is read-only,
34: * -f forces chmod'ing and touch'ing.
35: */
36: #include <sys/types.h>
37: #include <sys/file.h>
38: #include <sys/stat.h>
39: #include <stdio.h>
40:
41: static int dontcreate; /* set if -c option */
42: static int force; /* set if -f option */
43:
44: main(argc, argv)
45: int argc;
46: char **argv;
47: {
48: extern int optind;
49: int ch, retval;
50:
51: dontcreate = force = retval = 0;
52: while ((ch = getopt(argc, argv, "cf")) != EOF)
53: switch((char)ch) {
54: case 'c':
55: dontcreate = 1;
56: break;
57: case 'f':
58: force = 1;
59: break;
60: case '?':
61: default:
62: usage();
63: }
64: if (!*(argv += optind))
65: usage();
66: do {
67: retval |= touch(*argv);
68: } while (*++argv);
69: exit(retval);
70: }
71:
72: touch(filename)
73: char *filename;
74: {
75: struct stat statbuffer;
76:
77: if (stat(filename, &statbuffer) == -1) {
78: if (!dontcreate)
79: return(readwrite(filename, 0L));
80: fprintf(stderr, "touch: %s: does not exist\n", filename);
81: return(1);
82: }
83: if ((statbuffer.st_mode & S_IFMT) != S_IFREG) {
84: fprintf(stderr, "touch: %s: can only touch regular files\n",
85: filename);
86: return(1);
87: }
88: if (!access(filename, R_OK | W_OK))
89: return(readwrite(filename,statbuffer.st_size));
90: if (force) {
91: int retval;
92:
93: if (chmod(filename, 0666)) {
94: fprintf(stderr, "touch: %s: couldn't chmod: ",
95: filename);
96: perror((char *)NULL);
97: return(1);
98: }
99: retval = readwrite(filename, statbuffer.st_size);
100: if (chmod(filename, statbuffer.st_mode)) {
101: fprintf(stderr, "touch: %s: couldn't chmod back: ",
102: filename);
103: perror((char *)NULL);
104: return(1);
105: }
106: return(retval);
107: }
108: fprintf(stderr, "touch: %s: cannot touch\n", filename);
109: return(1);
110: }
111:
112: readwrite(filename, size)
113: char *filename;
114: off_t size;
115: {
116: int filedescriptor;
117: char first;
118: off_t lseek();
119:
120: if (size) {
121: filedescriptor = open(filename, O_RDWR, 0);
122: if (filedescriptor == -1) {
123: error: fprintf(stderr, "touch: %s: ", filename);
124: perror((char *)NULL);
125: return(1);
126: }
127: if (read(filedescriptor, &first, 1) != 1)
128: goto error;
129: if (lseek(filedescriptor, 0L, 0) == -1)
130: goto error;
131: if (write(filedescriptor, &first, 1) != 1)
132: goto error;
133: } else {
134: filedescriptor = creat(filename, 0666);
135: if (filedescriptor == -1)
136: goto error;
137: }
138: if (close(filedescriptor) == -1)
139: goto error;
140: return(0);
141: }
142:
143: usage()
144: {
145: fprintf(stderr, "usage: touch [-cf] file ...\n");
146: exit(1);
147: }
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