-/* Copyright (C) 1991, 1992, 1993, 1995 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1991-2016 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
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
-#include <ansidecl.h>
-#include <stdlib.h>
+#include <assert.h>
+#include <limits.h>
#include <stdio.h>
-#include <time.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
#include <string.h>
-#include <limits.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <stdint.h>
#define NOID
-#include <tzfile.h>
+#include <timezone/tzfile.h>
-int __use_tzfile = 0;
+int __use_tzfile;
+static dev_t tzfile_dev;
+static ino64_t tzfile_ino;
+static time_t tzfile_mtime;
struct ttinfo
{
long int change; /* Seconds of correction to apply. */
};
-static void compute_tzname_max __P ((size_t));
+static void compute_tzname_max (size_t) internal_function;
static size_t num_transitions;
-static time_t *transitions = NULL;
-static unsigned char *type_idxs = NULL;
+libc_freeres_ptr (static time_t *transitions);
+static unsigned char *type_idxs;
static size_t num_types;
-static struct ttinfo *types = NULL;
-static char *zone_names = NULL;
+static struct ttinfo *types;
+static char *zone_names;
+static long int rule_stdoff;
+static long int rule_dstoff;
static size_t num_leaps;
-static struct leap *leaps = NULL;
+static struct leap *leaps;
+static char *tzspec;
#include <endian.h>
+#include <byteswap.h>
/* Decode the four bytes at PTR as a signed integer in network byte order. */
static inline int
+__attribute ((always_inline))
decode (const void *ptr)
{
- if ((BYTE_ORDER == BIG_ENDIAN) && sizeof (int) == 4)
+ if (BYTE_ORDER == BIG_ENDIAN && sizeof (int) == 4)
return *(const int *) ptr;
- else
- {
- const unsigned char *p = ptr;
- int result = *p & (1 << (CHAR_BIT - 1)) ? ~0 : 0;
+ if (sizeof (int) == 4)
+ return bswap_32 (*(const int *) ptr);
- result = (result << 8) | *p++;
- result = (result << 8) | *p++;
- result = (result << 8) | *p++;
- result = (result << 8) | *p++;
+ const unsigned char *p = ptr;
+ int result = *p & (1 << (CHAR_BIT - 1)) ? ~0 : 0;
- return result;
- }
+ result = (result << 8) | *p++;
+ result = (result << 8) | *p++;
+ result = (result << 8) | *p++;
+ result = (result << 8) | *p++;
+
+ return result;
}
+
+static inline int64_t
+__attribute ((always_inline))
+decode64 (const void *ptr)
+{
+ if ((BYTE_ORDER == BIG_ENDIAN))
+ return *(const int64_t *) ptr;
+
+ return bswap_64 (*(const int64_t *) ptr);
+}
+
+
void
-DEFUN(__tzfile_read, (file), CONST char *file)
+__tzfile_read (const char *file, size_t extra, char **extrap)
{
+ 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 ();
__use_tzfile = 0;
- if (transitions != NULL)
- free((PTR) transitions);
- transitions = NULL;
- if (type_idxs != NULL)
- free((PTR) type_idxs);
- type_idxs = NULL;
- if (types != NULL)
- free((PTR) types);
- types = NULL;
- if (zone_names != NULL)
- free((PTR) zone_names);
- zone_names = NULL;
- if (leaps != NULL)
- free((PTR) leaps);
- leaps = NULL;
-
- if (file == NULL || *file == '\0')
+ if (file == NULL)
+ /* No user specification; use the site-wide default. */
file = TZDEFAULT;
+ else if (*file == '\0')
+ /* User specified the empty string; use UTC with no leap seconds. */
+ goto ret_free_transitions;
+ else
+ {
+ /* We must not allow to read an arbitrary file in a setuid
+ program. So we fail for any file which is not in the
+ directory hierachy starting at TZDIR
+ and which is not the system wide default TZDEFAULT. */
+ if (__libc_enable_secure
+ && ((*file == '/'
+ && memcmp (file, TZDEFAULT, sizeof TZDEFAULT)
+ && memcmp (file, default_tzdir, sizeof (default_tzdir) - 1))
+ || strstr (file, "../") != NULL))
+ /* This test is certainly a bit too restrictive but it should
+ catch all critical cases. */
+ goto ret_free_transitions;
+ }
if (*file != '/')
{
- static CONST char tzdir[] = TZDIR;
- register CONST unsigned int len = strlen(file) + 1;
- char *new = (char *) __alloca(sizeof(tzdir) + len);
- memcpy(new, tzdir, sizeof(tzdir) - 1);
- new[sizeof(tzdir) - 1] = '/';
- memcpy(&new[sizeof(tzdir)], file, len);
+ const char *tzdir;
+
+ tzdir = getenv ("TZDIR");
+ if (tzdir == NULL || *tzdir == '\0')
+ tzdir = default_tzdir;
+ if (__asprintf (&new, "%s/%s", tzdir, file) == -1)
+ goto ret_free_transitions;
file = new;
}
- f = fopen(file, "r");
+ /* If we were already using tzfile, check whether the file changed. */
+ struct stat64 st;
+ if (was_using_tzfile
+ && stat64 (file, &st) == 0
+ && tzfile_ino == st.st_ino && tzfile_dev == st.st_dev
+ && tzfile_mtime == st.st_mtime)
+ goto done; /* Nothing to do. */
+
+ /* Note the file is opened with cancellation in the I/O functions
+ disabled and if available FD_CLOEXEC set. */
+ f = fopen (file, "rce");
if (f == NULL)
- return;
+ goto ret_free_transitions;
+
+ /* Get information about the file we are actually using. */
+ if (fstat64 (__fileno (f), &st) != 0)
+ {
+ fclose (f);
+ goto ret_free_transitions;
+ }
+
+ free ((void *) transitions);
+ transitions = NULL;
- if (fread((PTR) &tzhead, sizeof(tzhead), 1, f) != 1)
+ /* Remember the inode and device number and modification time. */
+ tzfile_dev = st.st_dev;
+ tzfile_ino = st.st_ino;
+ tzfile_mtime = st.st_mtime;
+
+ /* No threads reading this stream. */
+ __fsetlocking (f, FSETLOCKING_BYCALLER);
+
+ read_again:
+ 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;
num_transitions = (size_t) decode (tzhead.tzh_timecnt);
num_isstd = (size_t) decode (tzhead.tzh_ttisstdcnt);
num_isgmt = (size_t) decode (tzhead.tzh_ttisgmtcnt);
- if (num_transitions > 0)
+ if (__glibc_unlikely (num_isstd > num_types || num_isgmt > num_types))
+ goto lose;
+
+ /* For platforms with 64-bit time_t we use the new format if available. */
+ if (sizeof (time_t) == 8 && trans_width == 4
+ && tzhead.tzh_version[0] != '\0')
{
- transitions = (time_t *) malloc (num_transitions * sizeof(time_t));
- if (transitions == NULL)
- goto lose;
- type_idxs = (unsigned char *) malloc (num_transitions);
- if (type_idxs == NULL)
+ /* We use the 8-byte format. */
+ trans_width = 8;
+
+ /* Position the stream before the second header. */
+ size_t to_skip = (num_transitions * (4 + 1)
+ + num_types * 6
+ + chars
+ + num_leaps * 8
+ + num_isstd
+ + num_isgmt);
+ if (fseek (f, to_skip, SEEK_CUR) != 0)
goto lose;
+
+ goto read_again;
}
- if (num_types > 0)
+
+ 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;
+ 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 = 0;
+ if (sizeof (time_t) == 8 && trans_width == 8)
{
- types = (struct ttinfo *) malloc (num_types * sizeof (struct ttinfo));
- if (types == NULL)
+ 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 (tzspec_len == 0
+ || SIZE_MAX - total_size < tzspec_len))
goto lose;
}
- if (chars > 0)
+ if (__glibc_unlikely (SIZE_MAX - total_size - tzspec_len < extra))
+ goto lose;
+
+ /* Allocate enough memory including the extra block requested by the
+ caller. */
+ transitions = (time_t *) malloc (total_size + tzspec_len + extra);
+ if (transitions == NULL)
+ goto lose;
+
+ type_idxs = (unsigned char *) transitions + (num_transitions
+ * sizeof (time_t));
+ types = (struct ttinfo *) ((char *) transitions + types_idx);
+ zone_names = (char *) types + num_types * sizeof (struct ttinfo);
+ leaps = (struct leap *) ((char *) transitions + leaps_idx);
+ 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 || __builtin_expect (trans_width == 8, 1))
{
- zone_names = (char *) malloc (chars);
- if (zone_names == NULL)
+ if (__builtin_expect (__fread_unlocked (transitions, trans_width + 1,
+ num_transitions, f)
+ != num_transitions, 0))
goto lose;
}
- if (num_leaps > 0)
+ else
{
- leaps = (struct leap *) malloc (num_leaps * sizeof (struct leap));
- if (leaps == NULL)
+ 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))
goto lose;
}
- if (sizeof (time_t) < 4)
- abort ();
-
- if (fread((PTR) transitions, 4, num_transitions, f) != num_transitions ||
- fread((PTR) type_idxs, 1, num_transitions, f) != num_transitions)
- 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 (__glibc_unlikely (type_idxs[i] >= num_types))
+ goto lose;
- if (BYTE_ORDER != BIG_ENDIAN || sizeof (time_t) != 4)
+ if ((BYTE_ORDER != BIG_ENDIAN && (sizeof (time_t) == 4 || trans_width == 4))
+ || (BYTE_ORDER == BIG_ENDIAN && sizeof (time_t) == 8
+ && trans_width == 4))
{
/* Decode the transition times, stored as 4-byte integers in
network (big-endian) byte order. We work from the end of
processed when sizeof (time_t) > 4. */
i = num_transitions;
while (i-- > 0)
- transitions[i] = decode ((char *) transitions + i*4);
+ transitions[i] = decode ((char *) transitions + i * 4);
+ }
+ else if (BYTE_ORDER != BIG_ENDIAN && sizeof (time_t) == 8)
+ {
+ /* Decode the transition times, stored as 8-byte integers in
+ network (big-endian) byte order. */
+ for (i = 0; i < num_transitions; ++i)
+ transitions[i] = decode64 ((char *) transitions + i * 8);
}
for (i = 0; i < num_types; ++i)
{
unsigned char x[4];
- if (fread((PTR) x, 1, 4, f) != 4 ||
- fread((PTR) &types[i].isdst, 1, 1, f) != 1 ||
- fread((PTR) &types[i].idx, 1, 1, f) != 1)
+ int c;
+ if (__builtin_expect (__fread_unlocked (x, 1,
+ sizeof (x), f) != sizeof (x),
+ 0))
+ goto lose;
+ c = getc_unlocked (f);
+ if (__glibc_unlikely ((unsigned int) c > 1u))
+ goto lose;
+ types[i].isdst = c;
+ c = getc_unlocked (f);
+ 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 (fread((PTR) zone_names, 1, chars, f) != chars)
+ if (__glibc_unlikely (__fread_unlocked (zone_names, 1, chars, f) != chars))
goto lose;
for (i = 0; i < num_leaps; ++i)
{
- unsigned char x[4];
- if (fread((PTR) x, 1, sizeof(x), f) != sizeof(x))
+ unsigned char x[8];
+ if (__builtin_expect (__fread_unlocked (x, 1, trans_width, f)
+ != trans_width, 0))
goto lose;
- leaps[i].transition = (time_t) decode (x);
- if (fread((PTR) x, 1, sizeof(x), f) != sizeof(x))
+ if (sizeof (time_t) == 4 || trans_width == 4)
+ leaps[i].transition = (time_t) decode (x);
+ else
+ leaps[i].transition = (time_t) decode64 (x);
+
+ 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)
{
- char c = getc(f);
- if (c == EOF)
+ int c = getc_unlocked (f);
+ if (__glibc_unlikely (c == EOF))
goto lose;
types[i].isstd = c != 0;
}
for (i = 0; i < num_isgmt; ++i)
{
- char c = getc(f);
- if (c == EOF)
+ int c = getc_unlocked (f);
+ if (__glibc_unlikely (c == EOF))
goto lose;
types[i].isgmt = c != 0;
}
while (i < num_types)
types[i++].isgmt = 0;
- (void) fclose(f);
+ /* Read the POSIX TZ-style information if possible. */
+ 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))
+ 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;
+ if (tzspec_len == 0)
+ goto lose;
+ char *tzstr = malloc (tzspec_len);
+ if (tzstr == NULL)
+ goto lose;
+ if (getc_unlocked (f) != '\n'
+ || (__fread_unlocked (tzstr, 1, tzspec_len - 1, f)
+ != tzspec_len - 1))
+ {
+ free (tzstr);
+ goto lose;
+ }
+ tzstr[tzspec_len - 1] = '\0';
+ tzspec = __tzstring (tzstr);
+ free (tzstr);
+ }
+
+ /* Don't use an empty TZ string. */
+ if (tzspec != NULL && tzspec[0] == '\0')
+ tzspec = NULL;
+
+ fclose (f);
+
+ /* First "register" all timezone names. */
+ for (i = 0; i < num_types; ++i)
+ (void) __tzstring (&zone_names[types[i].idx]);
+
+ /* Find the standard and daylight time offsets used by the rule file.
+ We choose the offsets in the types of each flavor that are
+ transitioned to earliest in time. */
+ __tzname[0] = NULL;
+ __tzname[1] = NULL;
+ for (i = num_transitions; i > 0; )
+ {
+ int type = type_idxs[--i];
+ int dst = types[type].isdst;
+
+ if (__tzname[dst] == NULL)
+ {
+ int idx = types[type].idx;
+
+ __tzname[dst] = __tzstring (&zone_names[idx]);
+
+ if (__tzname[1 - dst] != NULL)
+ break;
+ }
+ }
+ if (__tzname[0] == NULL)
+ {
+ /* This should only happen if there are no transition rules.
+ In this case there should be only one single type. */
+ assert (num_types == 1);
+ __tzname[0] = __tzstring (zone_names);
+ }
+ if (__tzname[1] == NULL)
+ __tzname[1] = __tzname[0];
compute_tzname_max (chars);
-
+
+ if (num_transitions == 0)
+ /* Use the first rule (which should also be the only one). */
+ rule_stdoff = rule_dstoff = types[0].offset;
+ else
+ {
+ int stdoff_set = 0, dstoff_set = 0;
+ rule_stdoff = rule_dstoff = 0;
+ i = num_transitions - 1;
+ do
+ {
+ if (!stdoff_set && !types[type_idxs[i]].isdst)
+ {
+ stdoff_set = 1;
+ rule_stdoff = types[type_idxs[i]].offset;
+ }
+ else if (!dstoff_set && types[type_idxs[i]].isdst)
+ {
+ dstoff_set = 1;
+ rule_dstoff = types[type_idxs[i]].offset;
+ }
+ if (stdoff_set && dstoff_set)
+ break;
+ }
+ while (i-- > 0);
+
+ if (!dstoff_set)
+ rule_dstoff = rule_stdoff;
+ }
+
+ __daylight = rule_stdoff != rule_dstoff;
+ __timezone = -rule_stdoff;
+
+ done:
__use_tzfile = 1;
+ free (new);
return;
- lose:;
- (void) fclose(f);
+ lose:
+ fclose (f);
+ ret_free_transitions:
+ free (new);
+ free ((void *) transitions);
+ transitions = NULL;
}
\f
/* The user specified a hand-made timezone, but not its DST rules.
from the TZDEFRULES file. */
void
-DEFUN(__tzfile_default, (std, dst, stdoff, dstoff),
- char *std AND char *dst AND
- long int stdoff AND long int dstoff)
+__tzfile_default (const char *std, const char *dst,
+ long int stdoff, long int dstoff)
{
- size_t stdlen, dstlen, i;
- long int rule_offset, rule_stdoff, rule_dstoff;
+ size_t stdlen = strlen (std) + 1;
+ size_t dstlen = strlen (dst) + 1;
+ size_t i;
int isdst;
+ char *cp;
- __tzfile_read (TZDEFRULES);
+ __tzfile_read (TZDEFRULES, stdlen + dstlen, &cp);
if (!__use_tzfile)
return;
return;
}
- /* Ignore the zone names read from the file. */
- free (zone_names);
-
- /* Use the names the user specified. */
- stdlen = strlen (std) + 1;
- dstlen = strlen (dst) + 1;
- zone_names = malloc (stdlen + dstlen);
- if (zone_names == NULL)
- {
- __use_tzfile = 0;
- return;
- }
- memcpy (zone_names, std, stdlen);
- memcpy (&zone_names[stdlen], dst, dstlen);
+ /* Ignore the zone names read from the file and use the given ones
+ instead. */
+ __mempcpy (__mempcpy (cp, std, stdlen), dst, dstlen);
+ zone_names = cp;
- /* Find the standard and daylight time offsets used by the rule file.
- We choose the offsets in the types of each flavor that are
- transitioned to earliest in time. */
- rule_stdoff = rule_dstoff = 0;
- for (i = 0; i < num_transitions; ++i)
- {
- if (!rule_stdoff && !types[type_idxs[i]].isdst)
- rule_stdoff = types[type_idxs[i]].offset;
- if (!rule_dstoff && types[type_idxs[i]].isdst)
- rule_dstoff = types[type_idxs[i]].offset;
- if (rule_stdoff && rule_dstoff)
- break;
- }
+ /* Now there are only two zones, regardless of what the file contained. */
+ num_types = 2;
/* Now correct the transition times for the user-specified standard and
daylight offsets from GMT. */
isdst = 0;
- rule_offset = rule_offset;
for (i = 0; i < num_transitions; ++i)
{
struct ttinfo *trans_type = &types[type_idxs[i]];
isdst = trans_type->isdst;
}
+ /* Now that we adjusted the transitions to the requested offsets,
+ reset the rule_stdoff and rule_dstoff values appropriately. They
+ are used elsewhere. */
+ rule_stdoff = stdoff;
+ rule_dstoff = dstoff;
+
/* Reset types 0 and 1 to describe the user's settings. */
types[0].idx = 0;
types[0].offset = stdoff;
types[1].offset = dstoff;
types[1].isdst = 1;
+ /* Reset the zone names to point to the user's names. */
+ __tzname[0] = (char *) std;
+ __tzname[1] = (char *) dst;
+
+ /* Set the timezone. */
+ __timezone = -types[0].offset;
+
compute_tzname_max (stdlen + dstlen);
+
+ /* Invalidate the tzfile attribute cache to force rereading
+ TZDEFRULES the next time it is used. */
+ tzfile_dev = 0;
+ tzfile_ino = 0;
+ tzfile_mtime = 0;
}
\f
-int
-DEFUN(__tzfile_compute, (timer, leap_correct, leap_hit),
- time_t timer AND long int *leap_correct AND int *leap_hit)
+void
+__tzfile_compute (time_t timer, int use_localtime,
+ long int *leap_correct, int *leap_hit,
+ struct tm *tp)
{
- struct ttinfo *info;
- register size_t i;
+ size_t i;
- if (num_transitions == 0 || timer < transitions[0])
+ if (use_localtime)
{
- /* TIMER is before any transition (or there are no transitions).
- Choose the first non-DST type
- (or the first if they're all DST types). */
- i = 0;
- while (i < num_types && types[i].isdst)
- ++i;
- if (i == num_types)
- i = 0;
- }
- else
- {
- /* Find the first transition after TIMER, and
- then pick the type of the transition before it. */
- for (i = 1; i < num_transitions; ++i)
- if (timer < transitions[i])
- break;
- i = type_idxs[i - 1];
- }
+ __tzname[0] = NULL;
+ __tzname[1] = NULL;
- info = &types[i];
- __daylight = info->isdst;
- __timezone = info->offset;
- for (i = 0; i < num_types && i < sizeof (__tzname) / sizeof (__tzname[0]);
- ++i)
- __tzname[types[i].isdst] = &zone_names[types[i].idx];
- if (info->isdst < sizeof (__tzname) / sizeof (__tzname[0]))
- __tzname[info->isdst] = &zone_names[info->idx];
+ 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
+ (or the first if they're all DST types). */
+ i = 0;
+ while (i < num_types && types[i].isdst)
+ {
+ if (__tzname[1] == NULL)
+ __tzname[1] = __tzstring (&zone_names[types[i].idx]);
+
+ ++i;
+ }
+
+ if (i == num_types)
+ i = 0;
+ __tzname[0] = __tzstring (&zone_names[types[i].idx]);
+ if (__tzname[1] == NULL)
+ {
+ size_t j = i;
+ while (j < num_types)
+ if (types[j].isdst)
+ {
+ __tzname[1] = __tzstring (&zone_names[types[j].idx]);
+ break;
+ }
+ else
+ ++j;
+ }
+ }
+ else if (__glibc_unlikely (timer >= transitions[num_transitions - 1]))
+ {
+ if (__glibc_unlikely (tzspec == NULL))
+ {
+ use_last:
+ i = num_transitions;
+ goto found;
+ }
+
+ /* Parse the POSIX TZ-style string. */
+ __tzset_parse_tz (tzspec);
+
+ /* Convert to broken down structure. If this fails do not
+ use the string. */
+ 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);
+
+ /* 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
+ {
+ /* Find the first transition after TIMER, and
+ then pick the type of the transition before it. */
+ size_t lo = 0;
+ size_t hi = num_transitions - 1;
+ /* Assume that DST is changing twice a year and guess initial
+ search spot from it.
+ Half of a gregorian year has on average 365.2425 * 86400 / 2
+ = 15778476 seconds. */
+ i = (transitions[num_transitions - 1] - timer) / 15778476;
+ if (i < num_transitions)
+ {
+ i = num_transitions - 1 - i;
+ if (timer < transitions[i])
+ {
+ if (i < 10 || timer >= transitions[i - 10])
+ {
+ /* Linear search. */
+ while (timer < transitions[i - 1])
+ --i;
+ goto found;
+ }
+ hi = i - 10;
+ }
+ else
+ {
+ if (i + 10 >= num_transitions || timer < transitions[i + 10])
+ {
+ /* Linear search. */
+ while (timer >= transitions[i])
+ ++i;
+ goto found;
+ }
+ lo = i + 10;
+ }
+ }
+
+ /* Binary search. */
+ /* assert (timer >= transitions[lo] && timer < transitions[hi]); */
+ while (lo + 1 < hi)
+ {
+ i = (lo + hi) / 2;
+ if (timer < transitions[i])
+ hi = i;
+ else
+ lo = i;
+ }
+ i = hi;
+
+ found:
+ /* assert (timer >= transitions[i - 1]
+ && (i == num_transitions || timer < transitions[i])); */
+ __tzname[types[type_idxs[i - 1]].isdst]
+ = __tzstring (&zone_names[types[type_idxs[i - 1]].idx]);
+ size_t j = i;
+ while (j < num_transitions)
+ {
+ int type = type_idxs[j];
+ int dst = types[type].isdst;
+ int idx = types[type].idx;
+
+ if (__tzname[dst] == NULL)
+ {
+ __tzname[dst] = __tzstring (&zone_names[idx]);
+
+ if (__tzname[1 - dst] != NULL)
+ break;
+ }
+
+ ++j;
+ }
+
+ if (__glibc_unlikely (__tzname[0] == NULL))
+ __tzname[0] = __tzname[1];
+
+ i = type_idxs[i - 1];
+ }
+ struct ttinfo *info = &types[i];
+ __daylight = rule_stdoff != rule_dstoff;
+ __timezone = -rule_stdoff;
+
+ if (__tzname[0] == NULL)
+ {
+ /* This should only happen if there are no transition rules.
+ In this case there should be only one single type. */
+ assert (num_types == 1);
+ __tzname[0] = __tzstring (zone_names);
+ }
+ if (__tzname[1] == NULL)
+ /* There is no daylight saving time. */
+ __tzname[1] = __tzname[0];
+ tp->tm_isdst = info->isdst;
+ assert (strcmp (&zone_names[info->idx], __tzname[tp->tm_isdst]) == 0);
+ tp->tm_zone = __tzname[tp->tm_isdst];
+ tp->tm_gmtoff = info->offset;
+ }
+
+ leap:
*leap_correct = 0L;
*leap_hit = 0;
i = num_leaps;
do
if (i-- == 0)
- return 1;
+ return;
while (timer < leaps[i].transition);
/* Apply its correction. */
leaps[i].change > leaps[i - 1].change))
{
*leap_hit = 1;
- while (i > 0 &&
- leaps[i].transition == leaps[i - 1].transition + 1 &&
- leaps[i].change == leaps[i - 1].change + 1)
+ while (i > 0
+ && leaps[i].transition == leaps[i - 1].transition + 1
+ && leaps[i].change == leaps[i - 1].change + 1)
{
++*leap_hit;
--i;
}
}
-
- return 1;
}
\f
-void
-DEFUN(compute_tzname_max, (chars), size_t chars)
+static void
+internal_function
+compute_tzname_max (size_t chars)
{
- extern long int __tzname_cur_max; /* Defined in __tzset.c. */
-
const char *p;
p = zone_names;
const char *start = p;
while (*p != '\0')
++p;
- if (p - start > __tzname_cur_max)
+ if ((size_t) (p - start) > __tzname_cur_max)
__tzname_cur_max = p - start;
- } while (++p < &zone_names[chars]);
+ }
+ while (++p < &zone_names[chars]);
}
projects / thirdparty / glibc.git / blobdiff