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comparison toys/posix/touch.c @ 1063:51f0dda223b8 draft

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Minor cleanups.
author Rob Landley <rob@landley.net>
date Mon, 09 Sep 2013 11:18:18 -0500
parents 3c744d5f0765
children 0d19abb90c52
comparison
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1062:3c744d5f0765 1063:51f0dda223b8
1 /* vi: set sw=4 ts=4: 1 /* touch.c : change timestamp of a file
2 * 2 *
3 * touch.c : change timestamp of a file
4 * Copyright 2012 Choubey Ji <warior.linux@gmail.com> 3 * Copyright 2012 Choubey Ji <warior.linux@gmail.com>
5 * 4 *
6 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html 5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html
7 * acmrtd
8 6
9 USE_TOUCH(NEWTOY(touch, "acd:mr:t:[!dtr]", TOYFLAG_BIN)) 7 USE_TOUCH(NEWTOY(touch, "acd:mr:t:[!dtr]", TOYFLAG_BIN))
10 8
11 config TOUCH 9 config TOUCH
12 bool "touch" 10 bool "touch"
13 default y 11 default y
14 help 12 help
15 usage: touch [OPTION]... FILE... 13 usage: touch [-amc] [-d DATE] [-t TIME] [-r FILE] FILE...
16 14
17 Update the access and modification times of each FILE to the current time. 15 Update the access and modification times of each FILE to the current time.
18 16
19 -a change access time 17 -a change access time
20 -m change modification time 18 -m change modification time
21 -c don't create file 19 -c don't create file
22 -d DATE use YYYY-MM-DDThh:mm:SS[.frac][tz] as time 20 -d set time to DATE (in YYYY-MM-DDThh:mm:SS[.frac][tz] format)
23 -t TIME use [[CC]YY]MMDDhhmm[.ss][frac] as time 21 -t set time to TIME (in [[CC]YY]MMDDhhmm[.ss][frac] format)
24 -r FILE use reference file's time 22 -r set time same as reference FILE
25 */ 23 */
26 24
27 #define FOR_touch 25 #define FOR_touch
28 #include "toys.h" 26 #include "toys.h"
29 27
31 char *time; 29 char *time;
32 char *file; 30 char *file;
33 char *date; 31 char *date;
34 ) 32 )
35 33
34 // Fetch access and/or modification time of a file
36 int fetch(char *file, struct timeval *tv, unsigned flags) 35 int fetch(char *file, struct timeval *tv, unsigned flags)
37 { 36 {
38 struct stat st; 37 struct stat st;
39 38
40 if (stat(TT.file, &st)) return 1; 39 if (stat(TT.file, &st)) return 1;
53 52
54 void touch_main(void) 53 void touch_main(void)
55 { 54 {
56 struct timeval tv[2]; 55 struct timeval tv[2];
57 struct tm tm; 56 struct tm tm;
58 char **ss; 57 char **ss, *date, *s;
59 int flag; 58 int flag, fd, i, len;
59
60 // Set time from clock?
60 61
61 gettimeofday(tv, NULL); 62 gettimeofday(tv, NULL);
62 localtime_r(&(tv->tv_sec), &tm); 63 localtime_r(&(tv->tv_sec), &tm);
63 64
65 // Set time from -d?
66
64 if (toys.optflags & (FLAG_t|FLAG_d)) { 67 if (toys.optflags & (FLAG_t|FLAG_d)) {
65 char *date, *s;
66 int i, len;
67
68 if (toys.optflags & FLAG_d) { 68 if (toys.optflags & FLAG_d) {
69 date = TT.date; 69 date = TT.date;
70 i = strlen(date)-1; 70 i = strlen(date);
71 if (*date && toupper(date[i])=='Z') { 71 if (i && i < sizeof(toybuf)) {
72 putenv("TZ=UTC"); 72 // Trailing Z means UTC timezone, don't expect libc to know this.
73 strncpy(toybuf, date, sizeof(toybuf)-1); 73 if (toupper(date[i])=='Z') {
74 date = toybuf; 74 putenv("TZ=UTC");
75 if (i > sizeof(toybuf)-1) i = sizeof(toybuf)-1; 75 strcpy(toybuf, date);
76 date[i]=0; 76 toybuf[i] = 0;
77 gmtime_r(&(tv->tv_sec), &tm); 77 date = toybuf;
78 } 78 gmtime_r(&(tv->tv_sec), &tm);
79 s = strptime(date, "%Y-%m-%dT%T", &tm); 79 }
80 if (s && *s=='.') { 80 s = strptime(date, "%Y-%m-%dT%T", &tm);
81 sscanf(s, ".%d%n", &i, &len); 81 if (s && *s=='.') {
82 s += len; 82 sscanf(s, ".%d%n", &i, &len);
83 tv->tv_usec = i; 83 s += len;
84 } 84 tv->tv_usec = i;
85 }
86 } else s = 0;
87
88 // Set time from -t?
89
85 } else { 90 } else {
86 strcpy(toybuf, "%Y%m%d%H%M"); 91 strcpy(toybuf, "%Y%m%d%H%M");
87 date = TT.time; 92 date = TT.time;
88 for (i=0;i<3;i++) { 93 for (i=0;i<3;i++) {
89 s = strptime(date, toybuf+(i&2), &tm); 94 s = strptime(date, toybuf+(i&2), &tm);
90 if (s) break; 95 if (s) break;
91 toybuf[1]='y'; 96 toybuf[1]='y';
92 } 97 }
93 if (s && *s=='.') { 98 if (s && *s=='.') {
94 int count = sscanf(s, ".%2d%u%n", &(tm.tm_sec), &i, &len); 99 int count = sscanf(s, ".%2d%u%n", &(tm.tm_sec), &i, &len);
100
95 if (count==2) tv->tv_usec = i; 101 if (count==2) tv->tv_usec = i;
96 s += len; 102 s += len;
97 } 103 }
98 } 104 }
99 105
104 perror_exit("bad '%s'", date); 110 perror_exit("bad '%s'", date);
105 } 111 }
106 } 112 }
107 tv[1]=tv[0]; 113 tv[1]=tv[0];
108 114
115 // Set time from -r?
116
109 if (TT.file && fetch(TT.file, tv, FLAG_a|FLAG_m)) 117 if (TT.file && fetch(TT.file, tv, FLAG_a|FLAG_m))
110 perror_exit("-r '%s'", TT.file); 118 perror_exit("-r '%s'", TT.file);
111 119
120 // Ok, we've got a time. Flip -am flags so now it's the ones we _keep_.
121
112 flag = (~toys.optflags) & (FLAG_m|FLAG_a); 122 flag = (~toys.optflags) & (FLAG_m|FLAG_a);
113 if (flag == (FLAG_m|FLAG_a)) flag = 0; 123
124 // Loop through files on command line
114 for (ss=toys.optargs; *ss;) { 125 for (ss=toys.optargs; *ss;) {
115 int fd; 126 if ((flag == (FLAG_m|FLAG_a) || !fetch(*ss, tv, flag)) && !utimes(*ss, tv))
116 127 ss++;
117 if ((!flag || !fetch(*ss, tv, flag)) && !utimes(*ss, tv)) ss++;
118 else if (toys.optflags & FLAG_c) ss++; 128 else if (toys.optflags & FLAG_c) ss++;
119 else if (-1 != (fd = open(*ss, O_CREAT, 0666))) close(fd); 129 else if (-1 != (fd = open(*ss, O_CREAT, 0666))) close(fd);
120 else perror_msg("'%s'", *ss++); 130 else perror_msg("'%s'", *ss++);
121 } 131 }
122 } 132 }