1 #include <stdio.h>
2 #include <string.h>
3 #include <sys/types.h>
4 #include <fcntl.h>
5 #include <sys/stat.h>
6 #include <stdlib.h>
7 #include <fcntl.h>
8
usage(void)9 static void usage(void)
10 {
11 fprintf(stderr, "touch: usage: touch [-alm] [-t time_t] <file>\n");
12 exit(1);
13 }
14
touch_main(int argc,char * argv[])15 int touch_main(int argc, char *argv[])
16 {
17 int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0;
18 struct timespec specified_time, times[2];
19 char *file = 0;
20
21 specified_time.tv_nsec = UTIME_NOW;
22
23 for (i = 1; i < argc; i++) {
24 if (argv[i][0] == '-') {
25 /* an option */
26 const char *arg = argv[i]+1;
27 while (arg[0]) {
28 switch (arg[0]) {
29 case 'a': aflag = 1; break;
30 case 'm': mflag = 1; break;
31 case 't':
32 if ((i+1) >= argc)
33 usage();
34 specified_time.tv_sec = atol(argv[++i]);
35 if (specified_time.tv_sec == 0) {
36 fprintf(stderr, "touch: invalid time_t\n");
37 exit(1);
38 }
39 specified_time.tv_nsec = 0;
40 break;
41 case 'l': flags |= AT_SYMLINK_NOFOLLOW; break;
42 case 'd': debug = 1; break;
43 default:
44 usage();
45 }
46 arg++;
47 }
48 } else {
49 /* not an option, and only accept one filename */
50 if (i+1 != argc)
51 usage();
52 file = argv[i];
53 }
54 }
55
56 if (! file) {
57 fprintf(stderr, "touch: no file specified\n");
58 exit(1);
59 }
60
61 if (access(file, F_OK))
62 if ((fd=creat(file, 0666)) != -1)
63 close(fd);
64
65 if ((mflag == 0) && (aflag == 0))
66 aflag = mflag = 1;
67
68 if (aflag)
69 times[0] = specified_time;
70 else
71 times[0].tv_nsec = UTIME_OMIT;
72
73 if (mflag)
74 times[1] = specified_time;
75 else
76 times[1].tv_nsec = UTIME_OMIT;
77
78 if (debug) {
79 fprintf(stderr, "file = %s\n", file);
80 fprintf(stderr, "times[0].tv_sec = %ld, times[0].tv_nsec = %ld\n", times[0].tv_sec, times[0].tv_nsec);
81 fprintf(stderr, "times[1].tv_sec = %ld, times[1].tv_nsec = %ld\n", times[1].tv_sec, times[1].tv_nsec);
82 fprintf(stderr, "flags = 0x%8.8x\n", flags);
83 }
84
85 return utimensat(AT_FDCWD, file, times, flags);
86 }
87
88