common/cmd_date.c

   1 /*
   2  * (C) Copyright 2001
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * RTC, Date & Time support: get and set date & time
  26  */
  27 #include <common.h>
  28 #include <command.h>
  29 #include <rtc.h>
  30
  31 #if (CONFIG_COMMANDS & CFG_CMD_DATE)
  32
  33 const char *weekdays[] = {
  34         "Sun", "Mon", "Tues", "Wednes", "Thurs", "Fri", "Satur",
  35 };
  36
  37 int mk_date (char *, struct rtc_time *);
  38
  39 int do_date (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  40 {
  41         struct rtc_time tm;
  42         int rcode = 0;
  43
  44         switch (argc) {
  45         case 2:                 /* set date & time */
  46                 if (strcmp(argv[1],"reset") == 0) {
  47                         printf ("Reset RTC...\n");
  48                         rtc_reset ();
  49                 } else {
  50                         /* initialize tm with current time */
  51                         rtc_get (&tm);
  52                         /* insert new date & time */
  53                         if (mk_date (argv[1], &tm) != 0) {
  54                                 printf ("## Bad date format\n");
  55                                 return 1;
  56                         }
  57                         /* and write to RTC */
  58                         rtc_set (&tm);
  59                 }
  60                 /* FALL TROUGH */
  61         case 1:                 /* get date & time */
  62                 rtc_get (&tm);
  63
  64                 printf ("Date: %4d-%02d-%02d (%sday)    Time: %2d:%02d:%02d\n",
  65                         tm.tm_year, tm.tm_mon, tm.tm_mday,
  66                         (tm.tm_wday<0 || tm.tm_wday>6) ?
  67                                 "unknown " : weekdays[tm.tm_wday],
  68                         tm.tm_hour, tm.tm_min, tm.tm_sec);
  69
  70                 return 0;
  71         default:
  72                 printf ("Usage:\n%s\n", cmdtp->usage);
  73                 rcode = 1;
  74         }
  75         return rcode;
  76 }
  77
  78 /*
  79  * simple conversion of two-digit string with error checking
  80  */
  81 static int cnvrt2 (char *str, int *valp)
  82 {
  83         int val;
  84
  85         if ((*str < '0') || (*str > '9'))
  86                 return (-1);
  87
  88         val = *str - '0';
  89
  90         ++str;
  91
  92         if ((*str < '0') || (*str > '9'))
  93                 return (-1);
  94
  95         *valp = 10 * val + (*str - '0');
  96
  97         return (0);
  98 }
  99
 100 /*
 101  * Convert date string: MMDDhhmm[[CC]YY][.ss]
 102  *
 103  * Some basic checking for valid values is done, but this will not catch
 104  * all possible error conditions.
 105  */
 106 int mk_date (char *datestr, struct rtc_time *tmp)
 107 {
 108         int len, val;
 109         char *ptr;
 110
 111         ptr = strchr (datestr,'.');
 112         len = strlen (datestr);
 113
 114         /* Set seconds */
 115         if (ptr) {
 116                 int sec;
 117
 118                 *ptr++ = '\0';
 119                 if ((len - (ptr - datestr)) != 2)
 120                         return (-1);
 121
 122                 len = strlen (datestr);
 123
 124                 if (cnvrt2 (ptr, &sec))
 125                         return (-1);
 126
 127                 tmp->tm_sec = sec;
 128         } else {
 129                 tmp->tm_sec = 0;
 130         }
 131
 132         if (len == 12) {                /* MMDDhhmmCCYY */
 133                 int year, century;
 134
 135                 if (cnvrt2 (datestr+ 8, &century) ||
 136                     cnvrt2 (datestr+10, &year) ) {
 137                         return (-1);
 138                 }
 139                 tmp->tm_year = 100 * century + year;
 140         } else if (len == 10) {         /* MMDDhhmmYY   */
 141                 int year, century;
 142
 143                 century = tmp->tm_year / 100;
 144                 if (cnvrt2 (datestr+ 8, &year))
 145                         return (-1);
 146                 tmp->tm_year = 100 * century + year;
 147         }
 148
 149         switch (len) {
 150         case 8:                 /* MMDDhhmm     */
 151                 /* fall thru */
 152         case 10:                /* MMDDhhmmYY   */
 153                 /* fall thru */
 154         case 12:                /* MMDDhhmmCCYY */
 155                 if (cnvrt2 (datestr+0, &val) ||
 156                     val > 12) {
 157                         break;
 158                 }
 159                 tmp->tm_mon  = val;
 160                 if (cnvrt2 (datestr+2, &val) ||
 161                     val > ((tmp->tm_mon==2) ? 29 : 31)) {
 162                         break;
 163                 }
 164                 tmp->tm_mday = val;
 165
 166                 if (cnvrt2 (datestr+4, &val) ||
 167                     val > 23) {
 168                         break;
 169                 }
 170                 tmp->tm_hour = val;
 171
 172                 if (cnvrt2 (datestr+6, &val) ||
 173                     val > 59) {
 174                         break;
 175                 }
 176                 tmp->tm_min  = val;
 177
 178                 /* calculate day of week */
 179                 GregorianDay (tmp);
 180
 181                 return (0);
 182         default:
 183                 break;
 184         }
 185
 186         return (-1);
 187 }
 188
 189 #endif  /* CFG_CMD_DATE */