diff options
Diffstat (limited to 'time/tzfile.c')
| -rw-r--r-- | time/tzfile.c | 114 |
1 files changed, 31 insertions, 83 deletions
diff --git a/time/tzfile.c b/time/tzfile.c index ea2d7cae4c..e95fd55f36 100644 --- a/time/tzfile.c +++ b/time/tzfile.c @@ -1,5 +1,4 @@ -/* Copyright (C) 1991-1993,1995-2001,2003,2004,2006 - Free Software Foundation, Inc. +/* Copyright (C) 1991-1993,1995-2001,2003,2004 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 @@ -72,34 +71,24 @@ 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; - if (sizeof (int) == 4) + else if (BYTE_ORDER == LITTLE_ENDIAN && sizeof (int) == 4) return bswap_32 (*(const int *) ptr); + else + { + const unsigned char *p = ptr; + int result = *p & (1 << (CHAR_BIT - 1)) ? ~0 : 0; - 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; -} - + result = (result << 8) | *p++; + result = (result << 8) | *p++; + result = (result << 8) | *p++; + result = (result << 8) | *p++; -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); + return result; + } } - void __tzfile_read (const char *file, size_t extra, char **extrap) { @@ -113,10 +102,6 @@ __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; @@ -200,10 +185,8 @@ __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) - || memcmp (tzhead.tzh_magic, TZ_MAGIC, sizeof (tzhead.tzh_magic)) != 0) + 1, f) != 1, 0)) goto lose; num_transitions = (size_t) decode (tzhead.tzh_timecnt); @@ -213,26 +196,6 @@ __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)); @@ -242,10 +205,10 @@ __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; - /* Allocate enough memory including the extra block requested by the - caller. */ - transitions = (time_t *) malloc (total_size + extra); + transitions = (time_t *) malloc (total_size); if (transitions == NULL) goto lose; @@ -257,11 +220,14 @@ __tzfile_read (const char *file, size_t extra, char **extrap) if (extra > 0) *extrap = (char *) &leaps[num_leaps]; - if (sizeof (time_t) == 4 || trans_width == 8) + if (sizeof (time_t) < 4) + abort (); + + if (sizeof (time_t) == 4) { - if (__builtin_expect (fread_unlocked (transitions, trans_width + 1, - num_transitions, f) - != num_transitions, 0)) + if (__builtin_expect (fread_unlocked (transitions, 1, + (4 + 1) * num_transitions, f) + != (4 + 1) * num_transitions, 0)) goto lose; } else @@ -279,9 +245,7 @@ __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 || trans_width == 4)) - || (BYTE_ORDER == BIG_ENDIAN && sizeof (time_t) == 8 - && trans_width == 4)) + if (BYTE_ORDER != BIG_ENDIAN || sizeof (time_t) != 4) { /* Decode the transition times, stored as 4-byte integers in network (big-endian) byte order. We work from the end of @@ -291,13 +255,6 @@ __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) { @@ -323,16 +280,13 @@ __tzfile_read (const char *file, size_t extra, char **extrap) for (i = 0; i < num_leaps; ++i) { - unsigned char x[8]; - if (__builtin_expect (fread_unlocked (x, 1, trans_width, f) - != trans_width, 0)) + unsigned char x[4]; + if (__builtin_expect (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x), + 0)) goto lose; - 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)) + leaps[i].transition = (time_t) decode (x); + if (__builtin_expect (fread_unlocked (x, 1, sizeof (x), f) != sizeof (x), + 0)) goto lose; leaps[i].change = (long int) decode (x); } @@ -357,12 +311,6 @@ __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. */ |