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Diffstat (limited to 'time/tzfile.c')
-rw-r--r--time/tzfile.c114
1 files changed, 83 insertions, 31 deletions
diff --git a/time/tzfile.c b/time/tzfile.c
index e95fd55f36..ea2d7cae4c 100644
--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1991-1993,1995-2001,2003,2004 Free Software Foundation, Inc.
+/* Copyright (C) 1991-1993,1995-2001,2003,2004,2006
+ 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
@@ -71,24 +72,34 @@ 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 if (BYTE_ORDER == LITTLE_ENDIAN && sizeof (int) == 4)
+ if (sizeof (int) == 4)
return bswap_32 (*(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++;
+ 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
__tzfile_read (const char *file, size_t extra, char **extrap)
{
@@ -102,6 +113,10 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
size_t types_idx;
size_t leaps_idx;
int was_using_tzfile = __use_tzfile;
+ int trans_width = 4;
+
+ if (sizeof (time_t) != 4 && sizeof (time_t) != 8)
+ abort ();
__use_tzfile = 0;
@@ -185,8 +200,10 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
/* No threads reading this stream. */
__fsetlocking (f, FSETLOCKING_BYCALLER);
+ read_again:
if (__builtin_expect (fread_unlocked ((void *) &tzhead, sizeof (tzhead),
- 1, f) != 1, 0))
+ 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);
@@ -196,6 +213,26 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
num_isstd = (size_t) decode (tzhead.tzh_ttisstdcnt);
num_isgmt = (size_t) decode (tzhead.tzh_ttisgmtcnt);
+ /* 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')
+ {
+ /* 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;
+ }
+
total_size = num_transitions * (sizeof (time_t) + 1);
total_size = ((total_size + __alignof__ (struct ttinfo) - 1)
& ~(__alignof__ (struct ttinfo) - 1));
@@ -205,10 +242,10 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
& ~(__alignof__ (struct leap) - 1));
leaps_idx = total_size;
total_size += num_leaps * sizeof (struct leap);
- /* This is for the extra memory required by the caller. */
- total_size += extra;
- transitions = (time_t *) malloc (total_size);
+ /* Allocate enough memory including the extra block requested by the
+ caller. */
+ transitions = (time_t *) malloc (total_size + extra);
if (transitions == NULL)
goto lose;
@@ -220,14 +257,11 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
if (extra > 0)
*extrap = (char *) &leaps[num_leaps];
- if (sizeof (time_t) < 4)
- abort ();
-
- if (sizeof (time_t) == 4)
+ if (sizeof (time_t) == 4 || trans_width == 8)
{
- if (__builtin_expect (fread_unlocked (transitions, 1,
- (4 + 1) * num_transitions, f)
- != (4 + 1) * num_transitions, 0))
+ if (__builtin_expect (fread_unlocked (transitions, trans_width + 1,
+ num_transitions, f)
+ != num_transitions, 0))
goto lose;
}
else
@@ -245,7 +279,9 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
if (__builtin_expect (type_idxs[i] >= num_types, 0))
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
@@ -255,6 +291,13 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
while (i-- > 0)
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)
{
@@ -280,13 +323,16 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
for (i = 0; i < num_leaps; ++i)
{
- unsigned char x[4];
- if (__builtin_expect (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x),
- 0))
+ 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 (__builtin_expect (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x),
- 0))
+ if (sizeof (time_t) == 4 || trans_width == 4)
+ leaps[i].transition = (time_t) decode (x);
+ else
+ leaps[i].transition = (time_t) decode64 (x);
+
+ if (__builtin_expect (fread_unlocked (x, 1, 4, f) != 4, 0))
goto lose;
leaps[i].change = (long int) decode (x);
}
@@ -311,6 +357,12 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
while (i < num_types)
types[i++].isgmt = 0;
+ /* XXX When a version 2 file is available it can contain a POSIX TZ-style
+ formatted string which specifies how times past the last one specified
+ are supposed to be handled. We might want to handle this at some
+ point. But it might be overhead since most/all? files have an
+ open-ended last entry. */
+
fclose (f);
/* First "register" all timezone names. */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-27 17:45:16 +0000