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annotate xen/common/time.c @ 22855:1d1eec7e1fb4

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xl: Perform minimal validation of virtual disk file while parsing config file

This patch performs some very basic validation on the virtual disk
file passed through the config file. This validation ensures that we
don't go too far with the initialization like spawn qemu and more
while there could be some potentially fundamental issues.

[ Patch fixed up to work with PHYSTYPE_EMPTY 22808:6ec61438713a -iwj ]

Signed-off-by: Kamala Narasimhan <kamala.narasimhan@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
author Kamala Narasimhan <kamala.narasimhan@gmail.com>
date Tue Jan 25 18:09:49 2011 +0000 (2011-01-25)
parents 459f35d8cac4
children
rev   line source
kfraser@11855 1 /******************************************************************************
kfraser@11855 2 * time.c
kfraser@11855 3 *
kfraser@11855 4 * This program is free software; you can redistribute it and/or modify
kfraser@11855 5 * it under the terms of the GNU General Public License as published by
kfraser@11855 6 * the Free Software Foundation; either version 2 of the License, or
kfraser@11855 7 * (at your option) any later version.
kfraser@11855 8 *
kfraser@11855 9 * This program is distributed in the hope that it will be useful,
kfraser@11855 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
kfraser@11855 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
kfraser@11855 12 * GNU General Public License for more details.
kfraser@11855 13 *
kfraser@11855 14 * You should have received a copy of the GNU General Public License
kfraser@11855 15 * along with this program; if not, write to the Free Software
kfraser@11855 16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
kfraser@11855 17 */
kfraser@11855 18
kfraser@11855 19 #include <xen/config.h>
kfraser@11855 20 #include <xen/time.h>
kfraser@11855 21
kfraser@11855 22 /* Nonzero if YEAR is a leap year (every 4 years,
kfraser@11855 23 except every 100th isn't, and every 400th is). */
kfraser@11855 24 #define __isleap(year) \
kfraser@11855 25 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
kfraser@11855 26
kfraser@11855 27 /* How many days are in each month. */
kfraser@11855 28 const unsigned short int __mon_lengths[2][12] = {
kfraser@11855 29 /* Normal years. */
kfraser@11855 30 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
kfraser@11855 31 /* Leap years. */
kfraser@11855 32 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
kfraser@11855 33 };
kfraser@11855 34
kfraser@11855 35 #define SECS_PER_HOUR (60 * 60)
kfraser@11855 36 #define SECS_PER_DAY (SECS_PER_HOUR * 24)
kfraser@11855 37
kfraser@11855 38 struct tm gmtime(unsigned long t)
kfraser@11855 39 {
kfraser@11855 40 struct tm tbuf;
kfraser@11855 41 long days, rem;
kfraser@11855 42 int y;
kfraser@13158 43 const unsigned short int *ip;
kfraser@11855 44
keir@21498 45 y = 1970;
keir@21498 46 #ifdef __x86_64__
keir@21498 47 /* Allow the concept of time before 1970. 64-bit only; for 32-bit
keir@21498 48 * time after 2038 seems more important than time before 1970. */
keir@21498 49 while ( t & (1UL<<39) )
keir@21498 50 {
keir@21498 51 y -= 400;
keir@21498 52 t += ((unsigned long)(365 * 303 + 366 * 97)) * SECS_PER_DAY;
keir@21498 53 }
keir@21498 54 t &= (1UL << 40) - 1;
keir@21498 55 #endif
keir@21498 56
kfraser@11855 57 days = t / SECS_PER_DAY;
kfraser@11855 58 rem = t % SECS_PER_DAY;
kfraser@11855 59
kfraser@11855 60 tbuf.tm_hour = rem / SECS_PER_HOUR;
kfraser@11855 61 rem %= SECS_PER_HOUR;
kfraser@11855 62 tbuf.tm_min = rem / 60;
kfraser@11855 63 tbuf.tm_sec = rem % 60;
kfraser@11855 64 /* January 1, 1970 was a Thursday. */
kfraser@11855 65 tbuf.tm_wday = (4 + days) % 7;
kfraser@11855 66 if ( tbuf.tm_wday < 0 )
kfraser@11855 67 tbuf.tm_wday += 7;
kfraser@11855 68 while ( days >= (rem = __isleap(y) ? 366 : 365) )
kfraser@11855 69 {
kfraser@11855 70 ++y;
kfraser@11855 71 days -= rem;
kfraser@11855 72 }
kfraser@11855 73 while ( days < 0 )
kfraser@11855 74 {
kfraser@11855 75 --y;
kfraser@11855 76 days += __isleap(y) ? 366 : 365;
kfraser@11855 77 }
kfraser@11855 78 tbuf.tm_year = y - 1900;
kfraser@11855 79 tbuf.tm_yday = days;
kfraser@13158 80 ip = (const unsigned short int *)__mon_lengths[__isleap(y)];
kfraser@11855 81 for ( y = 0; days >= ip[y]; ++y )
kfraser@11855 82 days -= ip[y];
kfraser@11855 83 tbuf.tm_mon = y;
kfraser@11855 84 tbuf.tm_mday = days + 1;
kfraser@11855 85 tbuf.tm_isdst = -1;
kfraser@11855 86
kfraser@11855 87 return tbuf;
kfraser@11855 88 }