diff options
| -rw-r--r-- | ChangeLog | 44 | ||||
| -rw-r--r-- | include/time.h | 39 | ||||
| -rw-r--r-- | posix/bits/types.h | 9 | ||||
| -rw-r--r-- | time/mktime-internal.h | 79 | ||||
| -rw-r--r-- | time/mktime.c | 71 | ||||
| -rw-r--r-- | time/timegm.c | 32 |
6 files changed, 220 insertions, 54 deletions
@@ -1,3 +1,47 @@ +2019-04-30 Paul Eggert <eggert@cs.ucla.edu> + + Make mktime etc. compatible with __time64_t + Keep these functions compatible with Gnulib while adding + __time64_t support. The basic idea is to move private API + declarations from include/time.h to time/mktime-internal.h, since + the former file cannot easily be shared with Gnulib whereas the + latter can. + Also, do some other minor cleanup while in the neighborhood. + * include/time.h: Include stdbool.h, time/mktime-internal.h. + (__mktime_internal): Move this prototype to time/mktime-internal.h, + since Gnulib needs it. + (__localtime64_r, __gmtime64_r) [__TIMESIZE == 64]: + Move these macros to time/mktime-internal.h, since Gnulib needs them. + (__mktime64, __timegm64) [__TIMESIZE != 64]: New prototypes. + (in_time_t_range): New static function. + * posix/bits/types.h (__time64_t): Move to time/mktime-internal.h, + so that glibc users are not tempted to use __time64_t. + * time/mktime-internal.h: Rewrite so that it does both glibc + and Gnulib work. Include time.h if not _LIBC. + (mktime_offset_t) [!_LIBC]: Define for gnulib. + (__time64_t): New type or macro, moved here from + posix/bits/types.h. + (__gmtime64_r, __localtime64_r, __mktime64, __timegm64) + [!_LIBC || __TIMESIZE == 64): New macros, mostly moved here + from include/time.h. + (__gmtime_r, __localtime_r, __mktime_internal) [!_LIBC]: + New macros, taken from GNulib. + (__mktime_internal): New prototype, moved here from include/time.h. + * time/mktime.c (mktime_min, mktime_max, convert_time) + (ranged_convert, __mktime_internal, __mktime64): + * time/timegm.c (__timegm64): + Use __time64_t, not time_t. + * time/mktime.c: Stop worrying about whether time_t is floating-point. + (__mktime64) [! (_LIBC && __TIMESIZE != 64)]: + Rename from mktime. + (mktime) [_LIBC && __TIMESIZE != 64]: New function. + * time/timegm.c [!_LIBC]: Include libc-config.h, not config.h, + for libc_hidden_def. + Include errno.h. + (__timegm64) [! (_LIBC && __TIMESIZE != 64)]: + Rename from timegm. + (timegm) [_LIBC && __TIMESIZE != 64]: New function. + 2019-04-30 Maciej W. Rozycki <macro@wdc.com> [BZ #19444] diff --git a/include/time.h b/include/time.h index 61dd9e1..ac3163c 100644 --- a/include/time.h +++ b/include/time.h @@ -3,6 +3,8 @@ #ifndef _ISOMAC # include <bits/types/locale_t.h> +# include <stdbool.h> +# include <time/mktime-internal.h> extern __typeof (strftime_l) __strftime_l; libc_hidden_proto (__strftime_l) @@ -49,19 +51,11 @@ extern void __tzset_parse_tz (const char *tz) attribute_hidden; extern void __tz_compute (__time64_t timer, struct tm *tm, int use_localtime) __THROW attribute_hidden; -/* Subroutine of `mktime'. Return the `time_t' representation of TP and - normalize TP, given that a `struct tm *' maps to a `time_t' as performed - by FUNC. Record next guess for localtime-gmtime offset in *OFFSET. */ -extern time_t __mktime_internal (struct tm *__tp, - struct tm *(*__func) (const time_t *, - struct tm *), - long int *__offset) attribute_hidden; - #if __TIMESIZE == 64 # define __ctime64 ctime #else extern char *__ctime64 (const __time64_t *__timer) __THROW; -libc_hidden_proto (__ctime64); +libc_hidden_proto (__ctime64) #endif #if __TIMESIZE == 64 @@ -69,7 +63,7 @@ libc_hidden_proto (__ctime64); #else extern char *__ctime64_r (const __time64_t *__restrict __timer, char *__restrict __buf) __THROW; -libc_hidden_proto (__ctime64_r); +libc_hidden_proto (__ctime64_r) #endif #if __TIMESIZE == 64 @@ -81,13 +75,13 @@ libc_hidden_proto (__localtime64) extern struct tm *__localtime_r (const time_t *__timer, struct tm *__tp) attribute_hidden; - -#if __TIMESIZE == 64 -# define __localtime64_r __localtime_r -#else +#if __TIMESIZE != 64 extern struct tm *__localtime64_r (const __time64_t *__timer, struct tm *__tp); libc_hidden_proto (__localtime64_r) + +extern __time64_t __mktime64 (struct tm *__tp) __THROW; +libc_hidden_proto (__mktime64) #endif extern struct tm *__gmtime_r (const time_t *__restrict __timer, @@ -99,14 +93,13 @@ libc_hidden_proto (__gmtime_r) #else extern struct tm *__gmtime64 (const __time64_t *__timer); libc_hidden_proto (__gmtime64) -#endif -#if __TIMESIZE == 64 -# define __gmtime64_r __gmtime_r -#else extern struct tm *__gmtime64_r (const __time64_t *__restrict __timer, struct tm *__restrict __tp); -libc_hidden_proto (__gmtime64_r); +libc_hidden_proto (__gmtime64_r) + +extern __time64_t __timegm64 (struct tm *__tp) __THROW; +libc_hidden_proto (__timegm64) #endif /* Compute the `struct tm' representation of T, @@ -155,5 +148,13 @@ extern double __difftime (time_t time1, time_t time0); actual clock ID. */ #define CLOCK_IDFIELD_SIZE 3 +/* Check whether T fits in time_t. */ +static inline bool +in_time_t_range (__time64_t t) +{ + time_t s = t; + return s == t; +} + #endif #endif diff --git a/posix/bits/types.h b/posix/bits/types.h index 0de6c59..cb737ca 100644 --- a/posix/bits/types.h +++ b/posix/bits/types.h @@ -213,10 +213,13 @@ __STD_TYPE __U32_TYPE __socklen_t; It is not currently necessary for this to be machine-specific. */ typedef int __sig_atomic_t; -#if __TIMESIZE == 64 +/* Seconds since the Epoch, visible to user code when time_t is too + narrow only for consistency with the old way of widening too-narrow + types. User code should never use __time64_t. */ +#if __TIMESIZE == 64 && defined __LIBC # define __time64_t __time_t -#else -__STD_TYPE __TIME64_T_TYPE __time64_t; /* Seconds since the Epoch. */ +#elif __TIMESIZE != 64 +__STD_TYPE __TIME64_T_TYPE __time64_t; #endif #undef __STD_TYPE diff --git a/time/mktime-internal.h b/time/mktime-internal.h index 6111c22..4cdeb9c 100644 --- a/time/mktime-internal.h +++ b/time/mktime-internal.h @@ -1,2 +1,79 @@ -/* Gnulib mktime-internal.h, tailored for glibc. */ +/* Internals of mktime and related functions + Copyright 2016-2019 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Paul Eggert <eggert@cs.ucla.edu>. + + 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 + 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, see + <https://www.gnu.org/licenses/>. */ + +#ifndef _LIBC +# include <time.h> +#endif + +/* mktime_offset_t is a signed type wide enough to hold a UTC offset + in seconds, and used as part of the type of the offset-guess + argument to mktime_internal. In Glibc, it is always long int. + When in Gnulib, use time_t on platforms where time_t + is signed, to be compatible with platforms like BeOS that export + this implementation detail of mktime. On platforms where time_t is + unsigned, GNU and POSIX code can assume 'int' is at least 32 bits + which is wide enough for a UTC offset. */ +#ifdef _LIBC typedef long int mktime_offset_t; +#elif defined TIME_T_IS_SIGNED +typedef time_t mktime_offset_t; +#else +typedef int mktime_offset_t; +#endif + +/* The source code uses identifiers like __time64_t for glibc + timestamps that can contain 64-bit values even when time_t is only + 32 bits. These are just macros for the ordinary identifiers unless + compiling within glibc when time_t is 32 bits. */ +#if ! (defined _LIBC && __TIMESIZE != 64) +# undef __time64_t +# define __time64_t time_t +# define __gmtime64_r __gmtime_r +# define __localtime64_r __localtime_r +# define __mktime64 mktime +# define __timegm64 timegm +#endif + +#ifndef _LIBC + +/* Although glibc source code uses leading underscores, Gnulib wants + ordinary names. + + Portable standalone applications should supply a <time.h> that + declares a POSIX-compliant localtime_r, for the benefit of older + implementations that lack localtime_r or have a nonstandard one. + Similarly for gmtime_r. See the gnulib time_r module for one way + to implement this. */ + +# undef __gmtime_r +# undef __localtime_r +# define __gmtime_r gmtime_r +# define __localtime_r localtime_r + +# define __mktime_internal mktime_internal + +#endif + +/* Subroutine of mktime. Return the time_t representation of TP and + normalize TP, given that a struct tm * maps to a time_t as performed + by FUNC. Record next guess for localtime-gmtime offset in *OFFSET. */ +extern __time64_t __mktime_internal (struct tm *tp, + struct tm *(*func) (__time64_t const *, + struct tm *), + mktime_offset_t *offset) attribute_hidden; diff --git a/time/mktime.c b/time/mktime.c index 57efee9..8fe2f96 100644 --- a/time/mktime.c +++ b/time/mktime.c @@ -112,11 +112,11 @@ my_tzset (void) added to them, and then with another timestamp added, without worrying about overflow. - Much of the code uses long_int to represent time_t values, to - lessen the hassle of dealing with platforms where time_t is + Much of the code uses long_int to represent __time64_t values, to + lessen the hassle of dealing with platforms where __time64_t is unsigned, and because long_int should suffice to represent all - time_t values that mktime can generate even on platforms where - time_t is excessively wide. */ + __time64_t values that mktime can generate even on platforms where + __time64_t is wider than the int components of struct tm. */ #if INT_MAX <= LONG_MAX / 4 / 366 / 24 / 60 / 60 typedef long int long_int; @@ -144,16 +144,15 @@ shr (long_int a, int b) : a / (one << b) - (a % (one << b) < 0)); } -/* Bounds for the intersection of time_t and long_int. */ +/* Bounds for the intersection of __time64_t and long_int. */ static long_int const mktime_min - = ((TYPE_SIGNED (time_t) && TYPE_MINIMUM (time_t) < TYPE_MINIMUM (long_int)) - ? TYPE_MINIMUM (long_int) : TYPE_MINIMUM (time_t)); + = ((TYPE_SIGNED (__time64_t) + && TYPE_MINIMUM (__time64_t) < TYPE_MINIMUM (long_int)) + ? TYPE_MINIMUM (long_int) : TYPE_MINIMUM (__time64_t)); static long_int const mktime_max - = (TYPE_MAXIMUM (long_int) < TYPE_MAXIMUM (time_t) - ? TYPE_MAXIMUM (long_int) : TYPE_MAXIMUM (time_t)); - -verify (TYPE_IS_INTEGER (time_t)); + = (TYPE_MAXIMUM (long_int) < TYPE_MAXIMUM (__time64_t) + ? TYPE_MAXIMUM (long_int) : TYPE_MAXIMUM (__time64_t)); #define EPOCH_YEAR 1970 #define TM_YEAR_BASE 1900 @@ -252,23 +251,23 @@ tm_diff (long_int year, long_int yday, int hour, int min, int sec, } /* Use CONVERT to convert T to a struct tm value in *TM. T must be in - range for time_t. Return TM if successful, NULL (setting errno) on + range for __time64_t. Return TM if successful, NULL (setting errno) on failure. */ static struct tm * -convert_time (struct tm *(*convert) (const time_t *, struct tm *), +convert_time (struct tm *(*convert) (const __time64_t *, struct tm *), long_int t, struct tm *tm) { - time_t x = t; + __time64_t x = t; return convert (&x, tm); } /* Use CONVERT to convert *T to a broken down time in *TP. If *T is out of range for conversion, adjust it so that it is the nearest in-range value and then convert that. - A value is in range if it fits in both time_t and long_int. + A value is in range if it fits in both __time64_t and long_int. Return TP on success, NULL (setting errno) on failure. */ static struct tm * -ranged_convert (struct tm *(*convert) (const time_t *, struct tm *), +ranged_convert (struct tm *(*convert) (const __time64_t *, struct tm *), long_int *t, struct tm *tp) { long_int t1 = (*t < mktime_min ? mktime_min @@ -310,7 +309,7 @@ ranged_convert (struct tm *(*convert) (const time_t *, struct tm *), } -/* Convert *TP to a time_t value, inverting +/* Convert *TP to a __time64_t value, inverting the monotonic and mostly-unit-linear conversion function CONVERT. Use *OFFSET to keep track of a guess at the offset of the result, compared to what the result would be for UTC without leap seconds. @@ -318,9 +317,9 @@ ranged_convert (struct tm *(*convert) (const time_t *, struct tm *), If successful, set *TP to the canonicalized struct tm; otherwise leave *TP alone, return ((time_t) -1) and set errno. This function is external because it is used also by timegm.c. */ -time_t +__time64_t __mktime_internal (struct tm *tp, - struct tm *(*convert) (const time_t *, struct tm *), + struct tm *(*convert) (const __time64_t *, struct tm *), mktime_offset_t *offset) { struct tm tm; @@ -520,9 +519,9 @@ __mktime_internal (struct tm *tp, #if defined _LIBC || NEED_MKTIME_WORKING || NEED_MKTIME_WINDOWS -/* Convert *TP to a time_t value. */ -time_t -mktime (struct tm *tp) +/* Convert *TP to a __time64_t value. */ +__time64_t +__mktime64 (struct tm *tp) { /* POSIX.1 8.1.1 requires that whenever mktime() is called, the time zone names contained in the external variable 'tzname' shall @@ -531,7 +530,7 @@ mktime (struct tm *tp) # if defined _LIBC || NEED_MKTIME_WORKING static mktime_offset_t localtime_offset; - return __mktime_internal (tp, __localtime_r, &localtime_offset); + return __mktime_internal (tp, __localtime64_r, &localtime_offset); # else # undef mktime return mktime (tp); @@ -539,11 +538,29 @@ mktime (struct tm *tp) } #endif /* _LIBC || NEED_MKTIME_WORKING || NEED_MKTIME_WINDOWS */ -#ifdef weak_alias -weak_alias (mktime, timelocal) +#if defined _LIBC && __TIMESIZE != 64 + +libc_hidden_def (__mktime64) + +time_t +mktime (struct tm *tp) +{ + struct tm tm = *tp; + __time64_t t = __mktime64 (&tm); + if (in_time_t_range (t)) + { + *tp = tm; + return t; + } + else + { + __set_errno (EOVERFLOW); + return -1; + } +} + #endif -#ifdef _LIBC +weak_alias (mktime, timelocal) libc_hidden_def (mktime) libc_hidden_weak (timelocal) -#endif diff --git a/time/timegm.c b/time/timegm.c index bfd36d0..bae0cee 100644 --- a/time/timegm.c +++ b/time/timegm.c @@ -18,17 +18,41 @@ <http://www.gnu.org/licenses/>. */ #ifndef _LIBC -# include <config.h> +# include <libc-config.h> #endif #include <time.h> +#include <errno.h> #include "mktime-internal.h" -time_t -timegm (struct tm *tmp) +__time64_t +__timegm64 (struct tm *tmp) { static mktime_offset_t gmtime_offset; tmp->tm_isdst = 0; - return __mktime_internal (tmp, __gmtime_r, &gmtime_offset); + return __mktime_internal (tmp, __gmtime64_r, &gmtime_offset); } + +#if defined _LIBC && __TIMESIZE != 64 + +libc_hidden_def (__timegm64) + +time_t +timegm (struct tm *tmp) +{ + struct tm tm = *tmp; + __time64_t t = __timegm64 (&tm); + if (in_time_t_range (t)) + { + *tmp = tm; + return t; + } + else + { + __set_errno (EOVERFLOW); + return -1; + } +} + +#endif |