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annotate toys/posix/date.c @ 656:6df4ccc0acbe

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Regularize command headers, update links to standards documents.
author Rob Landley <rob@landley.net>
date Sat, 25 Aug 2012 18:08:51 -0500
parents 2986aa63a021
children 7e846e281e38
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * date.c - set/get the date
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4 *
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5 * Copyright 2012 Andre Renaud <andre@bluewatersys.com>
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6 *
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7 * See http://opengroup.org/onlinepubs/9699919799/utilities/date.html
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8
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9 USE_DATE(NEWTOY(date, "r:u", TOYFLAG_BIN))
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10
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11 config DATE
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12 bool "date"
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13 default y
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14 help
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15 usage: date [-u] [-r file] [+format] | mmddhhmm[[cc]yy]
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16
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17 Set/get the current date/time
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18 */
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19
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20 #include "toys.h"
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21
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22 DEFINE_GLOBALS(
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23 char *file;
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24 )
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25
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26 #define TT this.date
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27
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28 #define FLAG_u 1
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29 #define FLAG_r 2
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30
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31 void date_main(void)
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32 {
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33 const char *format_string = "%a %b %e %H:%M:%S %Z %Y";
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34 time_t now = time(NULL);
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35 struct tm tm;
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36
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37 if (TT.file) {
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38 struct stat st;
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39
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40 xstat(TT.file, &st);
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41 now = st.st_mtim.tv_sec;
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42 }
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43 ((toys.optflags & FLAG_u) ? gmtime_r : localtime_r)(&now, &tm);
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44
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45 // Display the date?
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46 if (!toys.optargs[0] || toys.optargs[0][0] == '+') {
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47 if (toys.optargs[0]) format_string = toys.optargs[0]+1;
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48 if (!strftime(toybuf, sizeof(toybuf), format_string, &tm))
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49 perror_msg("bad format `%s'", format_string);
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51 puts(toybuf);
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52
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53 // Set the date
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54 } else {
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55 struct timeval tv;
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56 char *s = *toys.optargs;
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57 int len = strlen(s);
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58
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59 if (len < 8 || len > 12 || (len & 1)) error_msg("bad date `%s'", s);
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60
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61 // Date format: mmddhhmm[[cc]yy]
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62 memset(&tm, 0, sizeof(tm));
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63 len = sscanf(s, "%2u%2u%2u%2u", &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
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64 &tm.tm_min);
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65 tm.tm_mon--;
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66
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67 // If year specified, overwrite one we fetched earlier
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68 if (len > 8) {
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69 sscanf(s, "%u", &tm.tm_year);
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70 if (len == 12) tm.tm_year -= 1900;
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71 /* 69-99 = 1969-1999, 0 - 68 = 2000-2068 */
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72 else if (tm.tm_year < 69) tm.tm_year += 100;
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73 }
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74
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75 if (toys.optflags & FLAG_u) {
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76 // Get the UTC version of a struct tm
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77 char *tz = CFG_TOYBOX_FREE ? getenv("TZ") : 0;
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78 setenv("TZ", "UTC", 1);
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79 tzset();
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80 tv.tv_sec = mktime(&tm);
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81 if (CFG_TOYBOX_FREE) {
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82 if (tz) setenv("TZ", tz, 1);
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83 else unsetenv("TZ");
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84 tzset();
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85 }
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86 } else tv.tv_sec = mktime(&tm);
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87
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88 if (tv.tv_sec == (time_t)-1) error_msg("bad `%s'", toys.optargs[0]);
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89 tv.tv_usec = 0;
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90 if (!strftime(toybuf, sizeof(toybuf), format_string, &tm))
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91 perror_msg("bad format `%s'", format_string);
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92 puts(toybuf);
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93 if (settimeofday(&tv, NULL) < 0) perror_msg("cannot set date");
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94 }
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95 }