-/* Copyright (C) 1991-1993,1995-2001,2003,2004,2006, 2007
- Free Software Foundation, Inc.
+/* Copyright (C) 1991-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <limits.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
+#include <stdint.h>
#define NOID
#include <timezone/tzfile.h>
{
static const char default_tzdir[] = TZDIR;
size_t num_isstd, num_isgmt;
- register FILE *f;
+ FILE *f;
struct tzhead tzhead;
size_t chars;
- register size_t i;
+ size_t i;
size_t total_size;
size_t types_idx;
size_t leaps_idx;
int was_using_tzfile = __use_tzfile;
int trans_width = 4;
size_t tzspec_len;
+ char *new = NULL;
if (sizeof (time_t) != 4 && sizeof (time_t) != 8)
abort ();
if (*file != '/')
{
const char *tzdir;
- unsigned int len, tzdir_len;
- char *new, *tmp;
tzdir = getenv ("TZDIR");
if (tzdir == NULL || *tzdir == '\0')
- {
- tzdir = default_tzdir;
- tzdir_len = sizeof (default_tzdir) - 1;
- }
- else
- tzdir_len = strlen (tzdir);
- len = strlen (file) + 1;
- new = (char *) __alloca (tzdir_len + 1 + len);
- tmp = __mempcpy (new, tzdir, tzdir_len);
- *tmp++ = '/';
- memcpy (tmp, file, len);
+ tzdir = default_tzdir;
+ if (__asprintf (&new, "%s/%s", tzdir, file) == -1)
+ goto ret_free_transitions;
file = new;
}
&& stat64 (file, &st) == 0
&& tzfile_ino == st.st_ino && tzfile_dev == st.st_dev
&& tzfile_mtime == st.st_mtime)
- {
- /* Nothing to do. */
- __use_tzfile = 1;
- return;
- }
+ goto done; /* Nothing to do. */
/* Note the file is opened with cancellation in the I/O functions
- disabled. */
- f = fopen (file, "rc");
+ disabled and if available FD_CLOEXEC set. */
+ f = fopen (file, "rce");
if (f == NULL)
goto ret_free_transitions;
/* Get information about the file we are actually using. */
- if (fstat64 (fileno (f), &st) != 0)
+ if (fstat64 (__fileno (f), &st) != 0)
{
fclose (f);
goto ret_free_transitions;
__fsetlocking (f, FSETLOCKING_BYCALLER);
read_again:
- if (__builtin_expect (fread_unlocked ((void *) &tzhead, sizeof (tzhead),
- 1, f) != 1, 0)
+ if (__builtin_expect (__fread_unlocked ((void *) &tzhead, sizeof (tzhead),
+ 1, f) != 1, 0)
|| memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic)) != 0)
goto lose;
goto read_again;
}
+ if (__builtin_expect (num_transitions
+ > ((SIZE_MAX - (__alignof__ (struct ttinfo) - 1))
+ / (sizeof (time_t) + 1)), 0))
+ goto lose;
total_size = num_transitions * (sizeof (time_t) + 1);
total_size = ((total_size + __alignof__ (struct ttinfo) - 1)
& ~(__alignof__ (struct ttinfo) - 1));
types_idx = total_size;
- total_size += num_types * sizeof (struct ttinfo) + chars;
+ if (__builtin_expect (num_types
+ > (SIZE_MAX - total_size) / sizeof (struct ttinfo), 0))
+ goto lose;
+ total_size += num_types * sizeof (struct ttinfo);
+ if (__glibc_unlikely (chars > SIZE_MAX - total_size))
+ goto lose;
+ total_size += chars;
+ if (__builtin_expect (__alignof__ (struct leap) - 1
+ > SIZE_MAX - total_size, 0))
+ goto lose;
total_size = ((total_size + __alignof__ (struct leap) - 1)
& ~(__alignof__ (struct leap) - 1));
leaps_idx = total_size;
+ if (__builtin_expect (num_leaps
+ > (SIZE_MAX - total_size) / sizeof (struct leap), 0))
+ goto lose;
total_size += num_leaps * sizeof (struct leap);
- tzspec_len = (trans_width == 8
- ? st.st_size - (ftello (f)
- + num_transitions * (8 + 1)
- + num_types * 6
- + chars
- + num_leaps * 8
- + num_isstd
- + num_isgmt) - 1 : 0);
+ tzspec_len = 0;
+ if (sizeof (time_t) == 8 && trans_width == 8)
+ {
+ off_t rem = st.st_size - __ftello (f);
+ if (__builtin_expect (rem < 0
+ || (size_t) rem < (num_transitions * (8 + 1)
+ + num_types * 6
+ + chars), 0))
+ goto lose;
+ tzspec_len = (size_t) rem - (num_transitions * (8 + 1)
+ + num_types * 6
+ + chars);
+ if (__builtin_expect (num_leaps > SIZE_MAX / 12
+ || tzspec_len < num_leaps * 12, 0))
+ goto lose;
+ tzspec_len -= num_leaps * 12;
+ if (__glibc_unlikely (tzspec_len < num_isstd))
+ goto lose;
+ tzspec_len -= num_isstd;
+ if (__glibc_unlikely (tzspec_len == 0 || tzspec_len - 1 < num_isgmt))
+ goto lose;
+ tzspec_len -= num_isgmt + 1;
+ if (__glibc_unlikely (SIZE_MAX - total_size < tzspec_len))
+ goto lose;
+ }
+ if (__glibc_unlikely (SIZE_MAX - total_size - tzspec_len < extra))
+ goto lose;
/* Allocate enough memory including the extra block requested by the
caller. */
types = (struct ttinfo *) ((char *) transitions + types_idx);
zone_names = (char *) types + num_types * sizeof (struct ttinfo);
leaps = (struct leap *) ((char *) transitions + leaps_idx);
- if (trans_width == 8)
+ if (sizeof (time_t) == 8 && trans_width == 8)
tzspec = (char *) leaps + num_leaps * sizeof (struct leap) + extra;
else
tzspec = NULL;
if (extra > 0)
*extrap = (char *) &leaps[num_leaps];
- if (sizeof (time_t) == 4 || trans_width == 8)
+ if (sizeof (time_t) == 4 || __builtin_expect (trans_width == 8, 1))
{
- if (__builtin_expect (fread_unlocked (transitions, trans_width + 1,
- num_transitions, f)
+ if (__builtin_expect (__fread_unlocked (transitions, trans_width + 1,
+ num_transitions, f)
!= num_transitions, 0))
goto lose;
}
else
{
- if (__builtin_expect (fread_unlocked (transitions, 4, num_transitions, f)
+ if (__builtin_expect (__fread_unlocked (transitions, 4,
+ num_transitions, f)
!= num_transitions, 0)
- || __builtin_expect (fread_unlocked (type_idxs, 1, num_transitions,
- f) != num_transitions, 0))
+ || __builtin_expect (__fread_unlocked (type_idxs, 1, num_transitions,
+ f) != num_transitions, 0))
goto lose;
}
/* Check for bogus indices in the data file, so we can hereafter
safely use type_idxs[T] as indices into `types' and never crash. */
for (i = 0; i < num_transitions; ++i)
- if (__builtin_expect (type_idxs[i] >= num_types, 0))
+ if (__glibc_unlikely (type_idxs[i] >= num_types))
goto lose;
if ((BYTE_ORDER != BIG_ENDIAN && (sizeof (time_t) == 4 || trans_width == 4))
{
unsigned char x[4];
int c;
- if (__builtin_expect (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x),
+ if (__builtin_expect (__fread_unlocked (x, 1,
+ sizeof (x), f) != sizeof (x),
0))
goto lose;
c = getc_unlocked (f);
- if (__builtin_expect ((unsigned int) c > 1u, 0))
+ if (__glibc_unlikely ((unsigned int) c > 1u))
goto lose;
types[i].isdst = c;
c = getc_unlocked (f);
- if (__builtin_expect ((size_t) c > chars, 0))
+ if (__glibc_unlikely ((size_t) c > chars))
/* Bogus index in data file. */
goto lose;
types[i].idx = c;
types[i].offset = (long int) decode (x);
}
- if (__builtin_expect (fread_unlocked (zone_names, 1, chars, f) != chars, 0))
+ if (__glibc_unlikely (__fread_unlocked (zone_names, 1, chars, f) != chars))
goto lose;
for (i = 0; i < num_leaps; ++i)
{
unsigned char x[8];
- if (__builtin_expect (fread_unlocked (x, 1, trans_width, f)
+ if (__builtin_expect (__fread_unlocked (x, 1, trans_width, f)
!= trans_width, 0))
goto lose;
if (sizeof (time_t) == 4 || trans_width == 4)
else
leaps[i].transition = (time_t) decode64 (x);
- if (__builtin_expect (fread_unlocked (x, 1, 4, f) != 4, 0))
+ if (__glibc_unlikely (__fread_unlocked (x, 1, 4, f) != 4))
goto lose;
leaps[i].change = (long int) decode (x);
}
for (i = 0; i < num_isstd; ++i)
{
int c = getc_unlocked (f);
- if (__builtin_expect (c == EOF, 0))
+ if (__glibc_unlikely (c == EOF))
goto lose;
types[i].isstd = c != 0;
}
for (i = 0; i < num_isgmt; ++i)
{
int c = getc_unlocked (f);
- if (__builtin_expect (c == EOF, 0))
+ if (__glibc_unlikely (c == EOF))
goto lose;
types[i].isgmt = c != 0;
}
types[i++].isgmt = 0;
/* Read the POSIX TZ-style information if possible. */
- if (tzspec != NULL)
+ if (sizeof (time_t) == 8 && tzspec != NULL)
{
/* Skip over the newline first. */
if (getc_unlocked (f) != '\n'
- || fread_unlocked (tzspec, 1, tzspec_len - 1, f) != tzspec_len - 1)
+ || (__fread_unlocked (tzspec, 1, tzspec_len - 1, f)
+ != tzspec_len - 1))
tzspec = NULL;
else
tzspec[tzspec_len - 1] = '\0';
}
+ else if (sizeof (time_t) == 4 && tzhead.tzh_version[0] != '\0')
+ {
+ /* Get the TZ string. */
+ if (__builtin_expect (__fread_unlocked ((void *) &tzhead,
+ sizeof (tzhead), 1, f) != 1, 0)
+ || (memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic))
+ != 0))
+ goto lose;
+
+ size_t num_transitions2 = (size_t) decode (tzhead.tzh_timecnt);
+ size_t num_types2 = (size_t) decode (tzhead.tzh_typecnt);
+ size_t chars2 = (size_t) decode (tzhead.tzh_charcnt);
+ size_t num_leaps2 = (size_t) decode (tzhead.tzh_leapcnt);
+ size_t num_isstd2 = (size_t) decode (tzhead.tzh_ttisstdcnt);
+ size_t num_isgmt2 = (size_t) decode (tzhead.tzh_ttisgmtcnt);
+
+ /* Position the stream before the second header. */
+ size_t to_skip = (num_transitions2 * (8 + 1)
+ + num_types2 * 6
+ + chars2
+ + num_leaps2 * 12
+ + num_isstd2
+ + num_isgmt2);
+ off_t off;
+ if (fseek (f, to_skip, SEEK_CUR) != 0
+ || (off = __ftello (f)) < 0
+ || st.st_size < off + 2)
+ goto lose;
+
+ tzspec_len = st.st_size - off - 1;
+ char *tzstr = alloca (tzspec_len);
+ if (getc_unlocked (f) != '\n'
+ || (__fread_unlocked (tzstr, 1, tzspec_len - 1, f)
+ != tzspec_len - 1))
+ goto lose;
+ tzstr[tzspec_len - 1] = '\0';
+ tzspec = __tzstring (tzstr);
+ }
+
+ /* Don't use an empty TZ string. */
+ if (tzspec != NULL && tzspec[0] == '\0')
+ tzspec = NULL;
fclose (f);
__daylight = rule_stdoff != rule_dstoff;
__timezone = -rule_stdoff;
+ done:
__use_tzfile = 1;
+ free (new);
return;
lose:
fclose (f);
ret_free_transitions:
+ free (new);
free ((void *) transitions);
transitions = NULL;
}
long int *leap_correct, int *leap_hit,
struct tm *tp)
{
- register size_t i;
+ size_t i;
if (use_localtime)
{
__tzname[0] = NULL;
__tzname[1] = NULL;
- if (num_transitions == 0 || timer < transitions[0])
+ if (__glibc_unlikely (num_transitions == 0 || timer < transitions[0]))
{
/* TIMER is before any transition (or there are no transitions).
Choose the first non-DST type
++j;
}
}
- else if (timer >= transitions[num_transitions - 1])
+ else if (__glibc_unlikely (timer >= transitions[num_transitions - 1]))
{
- if (tzspec == NULL)
+ if (__glibc_unlikely (tzspec == NULL))
{
use_last:
i = num_transitions;
/* Convert to broken down structure. If this fails do not
use the string. */
- if (! __offtime (&timer, 0, tp))
+ if (__glibc_unlikely (! __offtime (&timer, 0, tp)))
goto use_last;
/* Use the rules from the TZ string to compute the change. */
__tz_compute (timer, tp, 1);
- *leap_correct = 0L;
- *leap_hit = 0;
- return;
+ /* If tzspec comes from posixrules loaded by __tzfile_default,
+ override the STD and DST zone names with the ones user
+ requested in TZ envvar. */
+ if (__glibc_unlikely (zone_names == (char *) &leaps[num_leaps]))
+ {
+ assert (num_types == 2);
+ __tzname[0] = __tzstring (zone_names);
+ __tzname[1] = __tzstring (&zone_names[strlen (zone_names) + 1]);
+ }
+
+ goto leap;
}
else
{
++j;
}
+ if (__glibc_unlikely (__tzname[0] == NULL))
+ __tzname[0] = __tzname[1];
+
i = type_idxs[i - 1];
}
tp->tm_gmtoff = info->offset;
}
+ leap:
*leap_correct = 0L;
*leap_hit = 0;
projects / thirdparty / glibc.git / blobdiff