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 #include <time.h>
9
usage(void)10 static void usage(void)
11 {
12 fprintf(stderr, "touch: usage: touch [-alm] [-t YYYYMMDD[.hhmmss]] <file>\n");
13 exit(1);
14 }
15
parse_time(char * s)16 static time_t parse_time(char *s)
17 {
18 struct tm tm;
19 int day = atoi(s);
20 int hour = 0;
21
22 while (*s && *s != '.') {
23 s++;
24 }
25
26 if (*s) {
27 s++;
28 hour = atoi(s);
29 }
30
31 tm.tm_year = day / 10000 - 1900;
32 tm.tm_mon = (day % 10000) / 100 - 1;
33 tm.tm_mday = day % 100;
34 tm.tm_hour = hour / 10000;
35 tm.tm_min = (hour % 10000) / 100;
36 tm.tm_sec = hour % 100;
37 tm.tm_isdst = -1;
38
39 return mktime(&tm);
40 }
41
touch_main(int argc,char * argv[])42 int touch_main(int argc, char *argv[])
43 {
44 int i, fd, aflag = 0, mflag = 0, debug = 0, flags = 0;
45 struct timespec specified_time, times[2];
46 char *file = 0;
47
48 specified_time.tv_nsec = UTIME_NOW;
49
50 for (i = 1; i < argc; i++) {
51 if (argv[i][0] == '-') {
52 /* an option */
53 const char *arg = argv[i]+1;
54 while (arg[0]) {
55 switch (arg[0]) {
56 case 'a': aflag = 1; break;
57 case 'm': mflag = 1; break;
58 case 't':
59 if ((i+1) >= argc)
60 usage();
61 specified_time.tv_sec = parse_time(argv[++i]);
62 if (specified_time.tv_sec == -1) {
63 fprintf(stderr, "touch: invalid timestamp specified\n");
64 exit(1);
65 }
66 specified_time.tv_nsec = 0;
67 break;
68 case 'l': flags |= AT_SYMLINK_NOFOLLOW; break;
69 case 'd': debug = 1; break;
70 default:
71 usage();
72 }
73 arg++;
74 }
75 } else {
76 /* not an option, and only accept one filename */
77 if (i+1 != argc)
78 usage();
79 file = argv[i];
80 }
81 }
82
83 if (! file) {
84 fprintf(stderr, "touch: no file specified\n");
85 exit(1);
86 }
87
88 if (access(file, F_OK))
89 if ((fd=creat(file, 0666)) != -1)
90 close(fd);
91
92 if ((mflag == 0) && (aflag == 0))
93 aflag = mflag = 1;
94
95 if (aflag)
96 times[0] = specified_time;
97 else
98 times[0].tv_nsec = UTIME_OMIT;
99
100 if (mflag)
101 times[1] = specified_time;
102 else
103 times[1].tv_nsec = UTIME_OMIT;
104
105 if (debug) {
106 fprintf(stderr, "file = %s\n", file);
107 fprintf(stderr, "times[0].tv_sec = %ld, times[0].tv_nsec = %ld\n", times[0].tv_sec, times[0].tv_nsec);
108 fprintf(stderr, "times[1].tv_sec = %ld, times[1].tv_nsec = %ld\n", times[1].tv_sec, times[1].tv_nsec);
109 fprintf(stderr, "flags = 0x%8.8x\n", flags);
110 }
111
112 return utimensat(AT_FDCWD, file, times, flags);
113 }
114
115