Mercurial > hg > toybox

annotate toys/posix/touch.c @ 1037:af1780148f7c draft

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Implement ls --color=auto, suggested by Rich Felker.
author Rob Landley <rob@landley.net>
date Sun, 01 Sep 2013 08:00:41 -0500
parents bd1225873eb4
children 3c744d5f0765
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * touch.c : change timestamp of a file
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4 * Copyright 2012 Choubey Ji <warior.linux@gmail.com>
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5 *
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6 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html
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7 * acmrtd
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8
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9 USE_TOUCH(NEWTOY(touch, "acd:mr:t:[!dtr]", TOYFLAG_BIN))
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10
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11 config TOUCH
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12 bool "touch"
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13 default y
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14 help
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15 usage: touch [OPTION]... FILE...
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16
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17 Update the access and modification times of each FILE to the current time.
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18
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19 -a change access time
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20 -m change modification time
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21 -c don't create file
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22 -d DATE use YYYY-MM-DDThh:mm:SS[.frac][tz] as time
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23 -t TIME use [[CC]YY]MMDDhhmm[.ss][frac] as time
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24 -r FILE use reference file's time
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25 */
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26
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27 #define FOR_touch
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28 #include "toys.h"
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29
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30 GLOBALS(
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31 char *time;
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32 char *file;
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33 char *date;
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34 )
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35
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36 int fetch(char *file, struct timeval *tv, unsigned flags)
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37 {
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38 struct stat st;
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39
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40 if (stat(TT.file, &st)) return 1;
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41
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42 if (flags & FLAG_a) {
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43 tv[0].tv_sec = st.st_atime;
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44 tv[0].tv_usec = st.st_atim.tv_nsec/1000;
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45 }
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46 if (flags & FLAG_m) {
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47 tv[1].tv_sec = st.st_mtime;
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48 tv[1].tv_usec = st.st_mtim.tv_nsec/1000;
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49 }
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50
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51 return 0;
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52 }
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53
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54 void touch_main(void)
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55 {
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56 struct timeval tv[2];
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57 struct tm tm;
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58 char **ss;
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59 int flag;
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60
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61 gettimeofday(tv, NULL);
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62 localtime_r(&(tv->tv_sec), &tm);
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63
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64 if (toys.optflags & (FLAG_t|FLAG_d)) {
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65 char *date, *s;
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66 int i, len;
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67
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68 if (toys.optflags & FLAG_d) {
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69 date = TT.date;
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70 i = strlen(date)-1;
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71 if (*date && toupper(date[i])=='Z') {
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72 putenv("TZ=UTC");
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73 strncpy(toybuf, date, sizeof(toybuf)-1);
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74 date = toybuf;
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75 date[i]=0;
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76 gmtime_r(&(tv->tv_sec), &tm);
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77 }
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78 s = strptime(date, "%Y-%m-%dT%T", &tm);
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79 if (s && *s=='.') {
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80 sscanf(s, ".%d%n", &i, &len);
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81 s += len;
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82 tv->tv_usec = i;
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83 }
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84 } else {
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85 strcpy(toybuf, "%Y%m%d%H%M");
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86 date = TT.time;
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87 for (i=0;i<3;i++) {
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88 s = strptime(date, toybuf+(i&2), &tm);
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89 if (s) break;
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90 toybuf[1]='y';
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91 }
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92 if (s && *s=='.') {
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93 int count = sscanf(s, ".%2d%u%n", &(tm.tm_sec), &i, &len);
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94 if (count==2) tv->tv_usec = i;
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95 s += len;
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96 }
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97 }
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98
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99 errno = 0;
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100 tv->tv_sec = mktime(&tm);
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101 if (!s || *s || errno == EOVERFLOW) {
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102 // Warn Indiana Jones the monkey died.
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103 perror_exit("bad '%s'", date);
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104 }
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105 }
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106 tv[1]=tv[0];
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107
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108 if (TT.file && fetch(TT.file, tv, FLAG_a|FLAG_m))
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109 perror_exit("-r '%s'", TT.file);
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110
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111 flag = (~toys.optflags) & (FLAG_m|FLAG_a);
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112 if (flag == (FLAG_m|FLAG_a)) flag = 0;
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113 for (ss=toys.optargs; *ss;) {
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114 int fd;
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115
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116 if ((!flag || !fetch(*ss, tv, flag)) && !utimes(*ss, tv)) ss++;
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117 else if (toys.optflags & FLAG_c) ss++;
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118 else if (-1 != (fd = open(*ss, O_CREAT, 0666))) close(fd);
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119 else perror_msg("'%s'", *ss++);
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120 }
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121 }