-/* Copyright (C) 1991, 1992, 1993, 1995 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Copyright (C) 1991, 92, 93, 95, 96, 97 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 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 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
+ Library 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 Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
-#include <ansidecl.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <limits.h>
+#include <unistd.h>
#define NOID
#include <tzfile.h>
long int change; /* Seconds of correction to apply. */
};
-static void compute_tzname_max __P ((size_t));
+extern char * __tzstring (const char *); /* Defined in tzset.c. */
+
+static struct ttinfo *find_transition (time_t timer);
+static void compute_tzname_max (size_t);
static size_t num_transitions;
static time_t *transitions = NULL;
static inline int
decode (const void *ptr)
{
-#if BYTE_ORDER == BIG_ENDIAN
- return *(const int *) ptr;
-#else
- const unsigned char *p = ptr;
- int result = 0;
-
- result = (result << 8) | *p++;
- result = (result << 8) | *p++;
- result = (result << 8) | *p++;
- result = (result << 8) | *p++;
-
- return result;
-#endif
+ 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;
+
+ result = (result << 8) | *p++;
+ result = (result << 8) | *p++;
+ result = (result << 8) | *p++;
+ result = (result << 8) | *p++;
+
+ return result;
+ }
}
void
-DEFUN(__tzfile_read, (file), CONST char *file)
+__tzfile_read (const char *file)
{
+ static const char default_tzdir[] = TZDIR;
size_t num_isstd, num_isgmt;
register FILE *f;
struct tzhead tzhead;
size_t chars;
register size_t i;
+ struct ttinfo *info;
__use_tzfile = 0;
if (transitions != NULL)
- free((PTR) transitions);
+ free ((void *) transitions);
transitions = NULL;
if (type_idxs != NULL)
- free((PTR) type_idxs);
+ free ((void *) type_idxs);
type_idxs = NULL;
if (types != NULL)
- free((PTR) types);
+ free ((void *) types);
types = NULL;
if (zone_names != NULL)
- free((PTR) zone_names);
+ free ((void *) zone_names);
zone_names = NULL;
if (leaps != NULL)
- free((PTR) leaps);
+ free ((void *) 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. */
+ return;
+ 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. */
+ return;
+ }
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;
+ unsigned int len, tzdir_len;
+ char *new;
+
+ tzdir = __secure_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);
+ memcpy (new, tzdir, tzdir_len);
+ new[tzdir_len] = '/';
+ memcpy (&new[tzdir_len + 1], file, len);
file = new;
}
- f = fopen(file, "r");
+ f = fopen (file, "r");
if (f == NULL)
return;
- if (fread((PTR) &tzhead, sizeof(tzhead), 1, f) != 1)
+ if (fread ((void *) &tzhead, sizeof (tzhead), 1, f) != 1)
goto lose;
num_transitions = (size_t) decode (tzhead.tzh_timecnt);
goto lose;
}
- if (fread((PTR) transitions, 4, num_transitions, f) != num_transitions ||
- fread((PTR) type_idxs, 1, num_transitions, f) != num_transitions)
+ if (sizeof (time_t) < 4)
+ abort ();
+
+ if (fread(transitions, 4, num_transitions, f) != num_transitions ||
+ fread(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 (type_idxs[i] >= num_types)
+ goto lose;
+
if (BYTE_ORDER != BIG_ENDIAN || sizeof (time_t) != 4)
{
/* Decode the transition times, stored as 4-byte integers in
the array so as not to clobber the next element to be
processed when sizeof (time_t) > 4. */
i = num_transitions;
- while (num_transitions-- > 0)
+ while (i-- > 0)
transitions[i] = decode ((char *) transitions + i*4);
}
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)
+ if (fread (x, 1, 4, f) != 4 ||
+ fread (&types[i].isdst, 1, 1, f) != 1 ||
+ fread (&types[i].idx, 1, 1, f) != 1)
+ goto lose;
+ if (types[i].idx >= chars) /* Bogus index in data file. */
goto lose;
types[i].offset = (long int) decode (x);
}
- if (fread((PTR) zone_names, 1, chars, f) != chars)
+ if (fread (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))
+ if (fread (x, 1, sizeof (x), f) != sizeof (x))
goto lose;
leaps[i].transition = (time_t) decode (x);
- if (fread((PTR) x, 1, sizeof(x), f) != sizeof(x))
+ if (fread (x, 1, sizeof (x), f) != sizeof (x))
goto lose;
leaps[i].change = (long int) decode (x);
}
for (i = 0; i < num_isstd; ++i)
{
- char c = getc(f);
+ int c = getc (f);
if (c == EOF)
goto lose;
types[i].isstd = c != 0;
for (i = 0; i < num_isgmt; ++i)
{
- char c = getc(f);
+ int c = getc (f);
if (c == EOF)
goto lose;
types[i].isgmt = c != 0;
while (i < num_types)
types[i++].isgmt = 0;
- (void) fclose(f);
+ fclose (f);
+
+ info = find_transition (0);
+ for (i = 0; i < num_types && i < sizeof (__tzname) / sizeof (__tzname[0]);
+ ++i)
+ __tzname[types[i].isdst] = __tzstring (&zone_names[types[i].idx]);
+ if (info->isdst < sizeof (__tzname) / sizeof (__tzname[0]))
+ __tzname[info->isdst] = __tzstring (&zone_names[info->idx]);
compute_tzname_max (chars);
-
+
__use_tzfile = 1;
return;
lose:;
- (void) fclose(f);
+ fclose(f);
}
\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;
/* 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_dstoff = 0;
+ rule_stdoff = rule_dstoff = 0;
for (i = 0; i < num_transitions; ++i)
{
if (!rule_stdoff && !types[type_idxs[i]].isdst)
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;
+
compute_tzname_max (stdlen + dstlen);
}
\f
-int
-DEFUN(__tzfile_compute, (timer, leap_correct, leap_hit),
- time_t timer AND long int *leap_correct AND int *leap_hit)
+static struct ttinfo *
+find_transition (time_t timer)
{
- struct ttinfo *info;
- register size_t i;
+ size_t i;
if (num_transitions == 0 || timer < transitions[0])
{
i = type_idxs[i - 1];
}
- 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];
+ return &types[i];
+}
+\f
+int
+__tzfile_compute (time_t timer, int use_localtime,
+ long int *leap_correct, int *leap_hit)
+{
+ register size_t i;
+
+ if (use_localtime)
+ {
+ struct ttinfo *info = find_transition (timer);
+ __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];
+ }
*leap_correct = 0L;
*leap_hit = 0;
return 1;
}
\f
-void
-DEFUN(compute_tzname_max, (chars), size_t chars)
+static void
+compute_tzname_max (size_t chars)
{
- extern long int __tzname_cur_max; /* Defined in __tzset.c. */
+ extern size_t __tzname_cur_max; /* Defined in tzset.c. */
const char *p;
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]);
}
projects / platform / upstream / glibc.git / blobdiff