apps/lib/stdlibc/time.c

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU Lesser General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #include <sys/types.h>
  20 #include <sys/time.h>
  21 #include <time.h>
  22 #include <syscall.h>
  23 #include <stdio.h>
  24
  25 /**
  26  * Converts date and time to a string
  27  *  @param timeptr Date and time
  28  *  @return String
  29  */
  30 char *asctime(const struct tm *timeptr) {
  31   char *wday_name[] = {"Sun","Mon","Tue","Wed","Thu", "Fri","Sat"};
  32   char *mon_name[] = {"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
  33   static char result[26];
  34   sprintf(result,"%s %s %u %02u:%02u:%02u %u\n",wday_name[timeptr->tm_wday],mon_name[timeptr->tm_mon],timeptr->tm_mday,timeptr->tm_hour,timeptr->tm_min, timeptr->tm_sec,1900+timeptr->tm_year);
  35   return result;
  36 }
  37
  38 /**
  39  * Builds timestamp from date and time
  40  *  @param tm Time and date
  41  *  @return Timestamp
  42  */
  43 time_t mktime(struct tm *tm) {
  44   return tm->tm_sec + tm->tm_min*60 + tm->tm_hour*3600 + tm->tm_yday*86400 +
  45          (tm->tm_year-70)*31536000 + ((tm->tm_year-69)/4)*86400 -
  46          ((tm->tm_year-1)/100)*86400 + ((tm->tm_year+299)/400)*86400;
  47 }
  48
  49 /**
  50  * Gets timestamp
  51  *  @param tloc Reference for timestamp
  52  *  @return Timestamp
  53  */
  54 time_t time(time_t *tloc) {
  55   struct timeval tp;
  56   gettimeofday(&tp,NULL);
  57   if (tloc!=NULL) *tloc = tp.tv_sec;
  58   return tp.tv_sec;
  59 }
  60
  61 /**
  62  * Returns number of ticks since process start
  63  *  @return Ticks
  64  */
  65 clock_t clock() {
  66   return syscall_call(SYSCALL_TIME_GETTICKS,0);
  67 }