From 3707f609cb8017371610a5e2233bd8478416217c Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Sun, 1 May 2016 18:36:38 -0700 Subject: [PATCH] Sync from gnulib This incorporates: 2016-05-01 mktime: port to stricter signed overflow checking 2016-05-01 mktime: speed up DEBUG_MKTIME benchmarks 2016-05-01 mktime: resurrect DEBUG_MKTIME testing 2016-05-01 mktime: simplify DEBUG_MKTIME 2016-05-01 Port mktime_internal offset to unsigned time_t 2016-04-27 xstrtol: prohibit monstrosities like "1bB" 2016-04-13 mktime: improve integer overflow checking 2016-04-13 intprops: check two's complement assumption 2016-04-13 intprops, mktime, strtol: assume two's complement * lib/intprops.h, lib/mktime-internal.h, lib/mktime.c: * lib/strtol.c, lib/timegm.c, m4/mktime.m4, m4/std-gnu11.m4: Copy from gnulib. --- lib/intprops.h | 45 ++--- lib/mktime-internal.h | 35 +++- lib/mktime.c | 461 ++++++++++++++++-------------------------- lib/strtol.c | 31 +-- lib/timegm.c | 6 +- m4/mktime.m4 | 22 +- m4/std-gnu11.m4 | 8 +- 7 files changed, 266 insertions(+), 342 deletions(-) diff --git a/lib/intprops.h b/lib/intprops.h index a278497b744..31521395e2a 100644 --- a/lib/intprops.h +++ b/lib/intprops.h @@ -21,6 +21,7 @@ #define _GL_INTPROPS_H #include +#include /* Return a value with the common real type of E and V and the value of V. */ #define _GL_INT_CONVERT(e, v) (0 * (e) + (v)) @@ -36,17 +37,6 @@ an integer. */ #define TYPE_IS_INTEGER(t) ((t) 1.5 == 1) -/* True if negative values of the signed integer type T use two's - complement, ones' complement, or signed magnitude representation, - respectively. Much GNU code assumes two's complement, but some - people like to be portable to all possible C hosts. */ -#define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1) -#define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0) -#define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1) - -/* True if the signed integer expression E uses two's complement. */ -#define _GL_INT_TWOS_COMPLEMENT(e) (~ _GL_INT_CONVERT (e, 0) == -1) - /* True if the real type T is signed. */ #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) @@ -55,18 +45,10 @@ #define EXPR_SIGNED(e) (_GL_INT_NEGATE_CONVERT (e, 1) < 0) -/* Minimum and maximum values for integer types and expressions. These - macros have undefined behavior if T is signed and has padding bits. - If this is a problem for you, please let us know how to fix it for - your host. */ +/* Minimum and maximum values for integer types and expressions. */ /* The maximum and minimum values for the integer type T. */ -#define TYPE_MINIMUM(t) \ - ((t) (! TYPE_SIGNED (t) \ - ? (t) 0 \ - : TYPE_SIGNED_MAGNITUDE (t) \ - ? ~ (t) 0 \ - : ~ TYPE_MAXIMUM (t))) +#define TYPE_MINIMUM(t) ((t) ~ TYPE_MAXIMUM (t)) #define TYPE_MAXIMUM(t) \ ((t) (! TYPE_SIGNED (t) \ ? (t) -1 \ @@ -76,7 +58,7 @@ after integer promotion. E should not have side effects. */ #define _GL_INT_MINIMUM(e) \ (EXPR_SIGNED (e) \ - ? - _GL_INT_TWOS_COMPLEMENT (e) - _GL_SIGNED_INT_MAXIMUM (e) \ + ? ~ _GL_SIGNED_INT_MAXIMUM (e) \ : _GL_INT_CONVERT (e, 0)) #define _GL_INT_MAXIMUM(e) \ (EXPR_SIGNED (e) \ @@ -85,8 +67,25 @@ #define _GL_SIGNED_INT_MAXIMUM(e) \ (((_GL_INT_CONVERT (e, 1) << (sizeof ((e) + 0) * CHAR_BIT - 2)) - 1) * 2 + 1) +/* This include file assumes that signed types are two's complement without + padding bits; the above macros have undefined behavior otherwise. + If this is a problem for you, please let us know how to fix it for your host. + As a sanity check, test the assumption for some signed types that + bounds. */ +verify (TYPE_MINIMUM (signed char) == SCHAR_MIN); +verify (TYPE_MAXIMUM (signed char) == SCHAR_MAX); +verify (TYPE_MINIMUM (short int) == SHRT_MIN); +verify (TYPE_MAXIMUM (short int) == SHRT_MAX); +verify (TYPE_MINIMUM (int) == INT_MIN); +verify (TYPE_MAXIMUM (int) == INT_MAX); +verify (TYPE_MINIMUM (long int) == LONG_MIN); +verify (TYPE_MAXIMUM (long int) == LONG_MAX); +#ifdef LLONG_MAX +verify (TYPE_MINIMUM (long long int) == LLONG_MIN); +verify (TYPE_MAXIMUM (long long int) == LLONG_MAX); +#endif -/* Return 1 if the __typeof__ keyword works. This could be done by +/* Does the __typeof__ keyword work? This could be done by 'configure', but for now it's easier to do it by hand. */ #if (2 <= __GNUC__ || defined __IBM__TYPEOF__ \ || (0x5110 <= __SUNPRO_C && !__STDC__)) diff --git a/lib/mktime-internal.h b/lib/mktime-internal.h index 4287acf4aca..2f586aef641 100644 --- a/lib/mktime-internal.h +++ b/lib/mktime-internal.h @@ -1,4 +1,37 @@ +/* mktime variant that also uses an offset guess + + Copyright 2016 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public + License as published by the Free Software Foundation; either + version 3 of the License, or (at your option) any later version. + + This program 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 + General Public License for more details. + + You should have received a copy of the GNU General Public + License along with this program; if not, see + . */ + #include + +/* 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. 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. */ + +#if TIME_T_IS_SIGNED +typedef time_t mktime_offset_t; +#else +typedef int mktime_offset_t; +#endif + time_t mktime_internal (struct tm *, struct tm * (*) (time_t const *, struct tm *), - time_t *); + mktime_offset_t *); diff --git a/lib/mktime.c b/lib/mktime.c index c9738d0daf9..419a177c018 100644 --- a/lib/mktime.c +++ b/lib/mktime.c @@ -17,11 +17,13 @@ License along with the GNU C Library; if not, see . */ -/* Define this to have a standalone program to test this implementation of +/* Define this to 1 to have a standalone program to test this implementation of mktime. */ -/* #define DEBUG_MKTIME 1 */ +#ifndef DEBUG_MKTIME +# define DEBUG_MKTIME 0 +#endif -#ifndef _LIBC +#if !defined _LIBC && !DEBUG_MKTIME # include #endif @@ -35,114 +37,76 @@ #include #include +#include -#include /* For the real memcpy prototype. */ +#include +#include -#if defined DEBUG_MKTIME && DEBUG_MKTIME +#if DEBUG_MKTIME # include # include +# include /* Make it work even if the system's libc has its own mktime routine. */ # undef mktime # define mktime my_mktime -#endif /* DEBUG_MKTIME */ - -/* Some of the code in this file assumes that signed integer overflow - silently wraps around. This assumption can't easily be programmed - around, nor can it be checked for portably at compile-time or - easily eliminated at run-time. - - Define WRAPV to 1 if the assumption is valid and if - #pragma GCC optimize ("wrapv") - does not trigger GCC bug 51793 - . - Otherwise, define it to 0; this forces the use of slower code that, - while not guaranteed by the C Standard, works on all production - platforms that we know about. */ -#ifndef WRAPV -# if (((__GNUC__ == 4 && 4 <= __GNUC_MINOR__) || 4 < __GNUC__) \ - && defined __GLIBC__) -# pragma GCC optimize ("wrapv") -# define WRAPV 1 -# else -# define WRAPV 0 -# endif #endif -/* Verify a requirement at compile-time (unlike assert, which is runtime). */ -#define verify(name, assertion) struct name { char a[(assertion) ? 1 : -1]; } +/* A signed type that can represent an integer number of years + multiplied by three times the number of seconds in a year. It is + needed when converting a tm_year value times the number of seconds + in a year. The factor of three comes because these products need + to be subtracted from each other, and sometimes with an offset + added to them, without worrying about overflow. -/* A signed type that is at least one bit wider than int. */ -#if INT_MAX <= LONG_MAX / 2 + Much of the code uses long_int to represent time_t values, to + lessen the hassle of dealing with platforms where time_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. */ + +#if INT_MAX <= LONG_MAX / 3 / 366 / 24 / 60 / 60 typedef long int long_int; #else typedef long long int long_int; #endif -verify (long_int_is_wide_enough, INT_MAX == INT_MAX * (long_int) 2 / 2); +verify (INT_MAX <= TYPE_MAXIMUM (long_int) / 3 / 366 / 24 / 60 / 60); /* Shift A right by B bits portably, by dividing A by 2**B and - truncating towards minus infinity. A and B should be free of side - effects, and B should be in the range 0 <= B <= INT_BITS - 2, where - INT_BITS is the number of useful bits in an int. GNU code can - assume that INT_BITS is at least 32. + truncating towards minus infinity. B should be in the range 0 <= B + <= LONG_INT_BITS - 2, where LONG_INT_BITS is the number of useful + bits in a long_int. LONG_INT_BITS is at least 32. ISO C99 says that A >> B is implementation-defined if A < 0. Some implementations (e.g., UNICOS 9.0 on a Cray Y-MP EL) don't shift right in the usual way when A < 0, so SHR falls back on division if ordinary A >> B doesn't seem to be the usual signed shift. */ -#define SHR(a, b) \ - ((-1 >> 1 == -1 \ - && (long_int) -1 >> 1 == -1 \ - && ((time_t) -1 >> 1 == -1 || ! TYPE_SIGNED (time_t))) \ - ? (a) >> (b) \ - : (a) / (1 << (b)) - ((a) % (1 << (b)) < 0)) - -/* The extra casts in the following macros work around compiler bugs, - e.g., in Cray C 5.0.3.0. */ - -/* True if the arithmetic type T is an integer type. bool counts as - an integer. */ -#define TYPE_IS_INTEGER(t) ((t) 1.5 == 1) - -/* True if negative values of the signed integer type T use two's - complement, or if T is an unsigned integer type. */ -#define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1) - -/* True if the arithmetic type T is signed. */ -#define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) - -/* The maximum and minimum values for the integer type T. These - macros have undefined behavior if T is signed and has padding bits. - If this is a problem for you, please let us know how to fix it for - your host. */ -#define TYPE_MINIMUM(t) \ - ((t) (! TYPE_SIGNED (t) \ - ? (t) 0 \ - : ~ TYPE_MAXIMUM (t))) -#define TYPE_MAXIMUM(t) \ - ((t) (! TYPE_SIGNED (t) \ - ? (t) -1 \ - : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1))) - -#ifndef TIME_T_MIN -# define TIME_T_MIN TYPE_MINIMUM (time_t) -#endif -#ifndef TIME_T_MAX -# define TIME_T_MAX TYPE_MAXIMUM (time_t) -#endif -#define TIME_T_MIDPOINT (SHR (TIME_T_MIN + TIME_T_MAX, 1) + 1) -verify (time_t_is_integer, TYPE_IS_INTEGER (time_t)); -verify (twos_complement_arithmetic, - (TYPE_TWOS_COMPLEMENT (int) - && TYPE_TWOS_COMPLEMENT (long_int) - && TYPE_TWOS_COMPLEMENT (time_t))); +static long_int +shr (long_int a, int b) +{ + long_int one = 1; + return (-one >> 1 == -1 + ? a >> b + : a / (one << b) - (a % (one << b) < 0)); +} + +/* Bounds for the intersection of time_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)); +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)); #define EPOCH_YEAR 1970 #define TM_YEAR_BASE 1900 -verify (base_year_is_a_multiple_of_100, TM_YEAR_BASE % 100 == 0); +verify (TM_YEAR_BASE % 100 == 0); -/* Return 1 if YEAR + TM_YEAR_BASE is a leap year. */ -static int +/* Is YEAR + TM_YEAR_BASE a leap year? */ +static bool leapyear (long_int year) { /* Don't add YEAR to TM_YEAR_BASE, as that might overflow. @@ -166,7 +130,9 @@ const unsigned short int __mon_yday[2][13] = }; -#ifndef _LIBC +#ifdef _LIBC +typedef time_t mktime_offset_t; +#else /* Portable standalone applications should supply a that declares a POSIX-compliant localtime_r, for the benefit of older implementations that lack localtime_r or have a nonstandard one. @@ -177,9 +143,9 @@ const unsigned short int __mon_yday[2][13] = # include "mktime-internal.h" #endif -/* Return 1 if the values A and B differ according to the rules for - tm_isdst: A and B differ if one is zero and the other positive. */ -static int +/* Do the values A and B differ according to the rules for tm_isdst? + A and B differ if one is zero and the other positive. */ +static bool isdst_differ (int a, int b) { return (!a != !b) && (0 <= a) && (0 <= b); @@ -190,104 +156,65 @@ isdst_differ (int a, int b) were not adjusted between the time stamps. The YEAR values uses the same numbering as TP->tm_year. Values - need not be in the usual range. However, YEAR1 must not be less - than 2 * INT_MIN or greater than 2 * INT_MAX. + need not be in the usual range. However, YEAR1 must not overflow + when multiplied by three times the number of seconds in a year, and + likewise for YDAY1 and three times the number of seconds in a day. */ - The result may overflow. It is the caller's responsibility to - detect overflow. */ - -static time_t +static long_int ydhms_diff (long_int year1, long_int yday1, int hour1, int min1, int sec1, int year0, int yday0, int hour0, int min0, int sec0) { - verify (C99_integer_division, -1 / 2 == 0); + verify (-1 / 2 == 0); /* Compute intervening leap days correctly even if year is negative. Take care to avoid integer overflow here. */ - int a4 = SHR (year1, 2) + SHR (TM_YEAR_BASE, 2) - ! (year1 & 3); - int b4 = SHR (year0, 2) + SHR (TM_YEAR_BASE, 2) - ! (year0 & 3); + int a4 = shr (year1, 2) + shr (TM_YEAR_BASE, 2) - ! (year1 & 3); + int b4 = shr (year0, 2) + shr (TM_YEAR_BASE, 2) - ! (year0 & 3); int a100 = a4 / 25 - (a4 % 25 < 0); int b100 = b4 / 25 - (b4 % 25 < 0); - int a400 = SHR (a100, 2); - int b400 = SHR (b100, 2); + int a400 = shr (a100, 2); + int b400 = shr (b100, 2); int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400); - /* Compute the desired time in time_t precision. Overflow might - occur here. */ - time_t tyear1 = year1; - time_t years = tyear1 - year0; - time_t days = 365 * years + yday1 - yday0 + intervening_leap_days; - time_t hours = 24 * days + hour1 - hour0; - time_t minutes = 60 * hours + min1 - min0; - time_t seconds = 60 * minutes + sec1 - sec0; + /* Compute the desired time without overflowing. */ + long_int years = year1 - year0; + long_int days = 365 * years + yday1 - yday0 + intervening_leap_days; + long_int hours = 24 * days + hour1 - hour0; + long_int minutes = 60 * hours + min1 - min0; + long_int seconds = 60 * minutes + sec1 - sec0; return seconds; } -/* Return the average of A and B, even if A + B would overflow. */ -static time_t -time_t_avg (time_t a, time_t b) +/* Return the average of A and B, even if A + B would overflow. + Round toward positive infinity. */ +static long_int +long_int_avg (long_int a, long_int b) { - return SHR (a, 1) + SHR (b, 1) + (a & b & 1); -} - -/* Return 1 if A + B does not overflow. If time_t is unsigned and if - B's top bit is set, assume that the sum represents A - -B, and - return 1 if the subtraction does not wrap around. */ -static int -time_t_add_ok (time_t a, time_t b) -{ - if (! TYPE_SIGNED (time_t)) - { - time_t sum = a + b; - return (sum < a) == (TIME_T_MIDPOINT <= b); - } - else if (WRAPV) - { - time_t sum = a + b; - return (sum < a) == (b < 0); - } - else - { - time_t avg = time_t_avg (a, b); - return TIME_T_MIN / 2 <= avg && avg <= TIME_T_MAX / 2; - } -} - -/* Return 1 if A + B does not overflow. */ -static int -time_t_int_add_ok (time_t a, int b) -{ - verify (int_no_wider_than_time_t, INT_MAX <= TIME_T_MAX); - if (WRAPV) - { - time_t sum = a + b; - return (sum < a) == (b < 0); - } - else - { - int a_odd = a & 1; - time_t avg = SHR (a, 1) + (SHR (b, 1) + (a_odd & b)); - return TIME_T_MIN / 2 <= avg && avg <= TIME_T_MAX / 2; - } + return shr (a, 1) + shr (b, 1) + ((a | b) & 1); } /* Return a time_t value corresponding to (YEAR-YDAY HOUR:MIN:SEC), - assuming that *T corresponds to *TP and that no clock adjustments + assuming that T corresponds to *TP and that no clock adjustments occurred between *TP and the desired time. - If TP is null, return a value not equal to *T; this avoids false matches. - If overflow occurs, yield the minimal or maximal value, except do not - yield a value equal to *T. */ -static time_t + Although T and the returned value are of type long_int, + they represent time_t values and must be in time_t range. + If TP is null, return a value not equal to T; this avoids false matches. + YEAR and YDAY must not be so large that multiplying them by three times the + number of seconds in a year (or day, respectively) would overflow long_int. + If the returned value would be out of range, yield the minimal or + maximal in-range value, except do not yield a value equal to T. */ +static long_int guess_time_tm (long_int year, long_int yday, int hour, int min, int sec, - const time_t *t, const struct tm *tp) + long_int t, const struct tm *tp) { if (tp) { - time_t d = ydhms_diff (year, yday, hour, min, sec, - tp->tm_year, tp->tm_yday, - tp->tm_hour, tp->tm_min, tp->tm_sec); - if (time_t_add_ok (*t, d)) - return *t + d; + long_int result; + long_int d = ydhms_diff (year, yday, hour, min, sec, + tp->tm_year, tp->tm_yday, + tp->tm_hour, tp->tm_min, tp->tm_sec); + if (! INT_ADD_WRAPV (t, d, &result)) + return result; } /* Overflow occurred one way or another. Return the nearest result @@ -295,32 +222,51 @@ guess_time_tm (long_int year, long_int yday, int hour, int min, int sec, if the actual difference is nonzero, as that would cause a false match; and don't oscillate between two values, as that would confuse the spring-forward gap detector. */ - return (*t < TIME_T_MIDPOINT - ? (*t <= TIME_T_MIN + 1 ? *t + 1 : TIME_T_MIN) - : (TIME_T_MAX - 1 <= *t ? *t - 1 : TIME_T_MAX)); + return (t < long_int_avg (mktime_min, mktime_max) + ? (t <= mktime_min + 1 ? t + 1 : mktime_min) + : (mktime_max - 1 <= t ? t - 1 : mktime_max)); +} + +/* Use CONVERT to convert T to a struct tm value in *TM. T must be in + range for time_t. Return TM if successfull, NULL if T is out of + range for CONVERT. */ +static struct tm * +convert_time (struct tm *(*convert) (const time_t *, struct tm *), + long_int t, struct tm *tm) +{ + time_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. */ + 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. */ static struct tm * ranged_convert (struct tm *(*convert) (const time_t *, struct tm *), - time_t *t, struct tm *tp) + long_int *t, struct tm *tp) { - struct tm *r = convert (t, tp); + struct tm *r; + if (*t < mktime_min) + *t = mktime_min; + else if (mktime_max < *t) + *t = mktime_max; + r = convert_time (convert, *t, tp); if (!r && *t) { - time_t bad = *t; - time_t ok = 0; + long_int bad = *t; + long_int ok = 0; - /* BAD is a known unconvertible time_t, and OK is a known good one. + /* BAD is a known unconvertible value, and OK is a known good one. Use binary search to narrow the range between BAD and OK until they differ by 1. */ - while (bad != ok + (bad < 0 ? -1 : 1)) + while (true) { - time_t mid = *t = time_t_avg (ok, bad); - r = convert (t, tp); + long_int mid = long_int_avg (ok, bad); + if (mid != ok && mid != bad) + break; + r = convert_time (convert, mid, tp); if (r) ok = mid; else @@ -331,15 +277,13 @@ ranged_convert (struct tm *(*convert) (const time_t *, struct tm *), { /* The last conversion attempt failed; revert to the most recent successful attempt. */ - *t = ok; - r = convert (t, tp); + r = convert_time (convert, ok, tp); } } return r; } - /* Convert *TP to a time_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, @@ -349,9 +293,9 @@ ranged_convert (struct tm *(*convert) (const time_t *, struct tm *), time_t __mktime_internal (struct tm *tp, struct tm *(*convert) (const time_t *, struct tm *), - time_t *offset) + mktime_offset_t *offset) { - time_t t, gt, t0, t1, t2; + long_int t, gt, t0, t1, t2, dt; struct tm tm; /* The maximum number of probes (calls to CONVERT) should be enough @@ -381,9 +325,7 @@ __mktime_internal (struct tm *tp, long_int year = lyear_requested + mon_years; /* The other values need not be in range: - the remaining code handles minor overflows correctly, - assuming int and time_t arithmetic wraps around. - Major overflows are caught at the end. */ + the remaining code handles overflows correctly. */ /* Calculate day of year from year, month, and day of month. The result need not be in range. */ @@ -393,7 +335,7 @@ __mktime_internal (struct tm *tp, long_int lmday = mday; long_int yday = mon_yday + lmday; - time_t guessed_offset = *offset; + int negative_offset_guess; int sec_requested = sec; @@ -410,71 +352,14 @@ __mktime_internal (struct tm *tp, /* Invert CONVERT by probing. First assume the same offset as last time. */ + INT_SUBTRACT_WRAPV (0, *offset, &negative_offset_guess); t0 = ydhms_diff (year, yday, hour, min, sec, - EPOCH_YEAR - TM_YEAR_BASE, 0, 0, 0, - guessed_offset); - - if (TIME_T_MAX / INT_MAX / 366 / 24 / 60 / 60 < 3) - { - /* time_t isn't large enough to rule out overflows, so check - for major overflows. A gross check suffices, since if t0 - has overflowed, it is off by a multiple of TIME_T_MAX - - TIME_T_MIN + 1. So ignore any component of the difference - that is bounded by a small value. */ - - /* Approximate log base 2 of the number of time units per - biennium. A biennium is 2 years; use this unit instead of - years to avoid integer overflow. For example, 2 average - Gregorian years are 2 * 365.2425 * 24 * 60 * 60 seconds, - which is 63113904 seconds, and rint (log2 (63113904)) is - 26. */ - int ALOG2_SECONDS_PER_BIENNIUM = 26; - int ALOG2_MINUTES_PER_BIENNIUM = 20; - int ALOG2_HOURS_PER_BIENNIUM = 14; - int ALOG2_DAYS_PER_BIENNIUM = 10; - int LOG2_YEARS_PER_BIENNIUM = 1; - - int approx_requested_biennia = - (SHR (year_requested, LOG2_YEARS_PER_BIENNIUM) - - SHR (EPOCH_YEAR - TM_YEAR_BASE, LOG2_YEARS_PER_BIENNIUM) - + SHR (mday, ALOG2_DAYS_PER_BIENNIUM) - + SHR (hour, ALOG2_HOURS_PER_BIENNIUM) - + SHR (min, ALOG2_MINUTES_PER_BIENNIUM) - + (LEAP_SECONDS_POSSIBLE - ? 0 - : SHR (sec, ALOG2_SECONDS_PER_BIENNIUM))); - - int approx_biennia = SHR (t0, ALOG2_SECONDS_PER_BIENNIUM); - int diff = approx_biennia - approx_requested_biennia; - int approx_abs_diff = diff < 0 ? -1 - diff : diff; - - /* IRIX 4.0.5 cc miscalculates TIME_T_MIN / 3: it erroneously - gives a positive value of 715827882. Setting a variable - first then doing math on it seems to work. - (ghazi@caip.rutgers.edu) */ - time_t time_t_max = TIME_T_MAX; - time_t time_t_min = TIME_T_MIN; - time_t overflow_threshold = - (time_t_max / 3 - time_t_min / 3) >> ALOG2_SECONDS_PER_BIENNIUM; - - if (overflow_threshold < approx_abs_diff) - { - /* Overflow occurred. Try repairing it; this might work if - the time zone offset is enough to undo the overflow. */ - time_t repaired_t0 = -1 - t0; - approx_biennia = SHR (repaired_t0, ALOG2_SECONDS_PER_BIENNIUM); - diff = approx_biennia - approx_requested_biennia; - approx_abs_diff = diff < 0 ? -1 - diff : diff; - if (overflow_threshold < approx_abs_diff) - return -1; - guessed_offset += repaired_t0 - t0; - t0 = repaired_t0; - } - } + EPOCH_YEAR - TM_YEAR_BASE, 0, 0, 0, negative_offset_guess); /* Repeatedly use the error to improve the guess. */ for (t = t1 = t2 = t0, dst2 = 0; - (gt = guess_time_tm (year, yday, hour, min, sec, &t, + (gt = guess_time_tm (year, yday, hour, min, sec, t, ranged_convert (convert, &t, &tm)), t != gt); t1 = t2, t2 = t, t = gt, dst2 = tm.tm_isdst != 0) @@ -531,39 +416,42 @@ __mktime_internal (struct tm *tp, for (delta = stride; delta < delta_bound; delta += stride) for (direction = -1; direction <= 1; direction += 2) - if (time_t_int_add_ok (t, delta * direction)) - { - time_t ot = t + delta * direction; - struct tm otm; - ranged_convert (convert, &ot, &otm); - if (! isdst_differ (isdst, otm.tm_isdst)) - { - /* We found the desired tm_isdst. - Extrapolate back to the desired time. */ - t = guess_time_tm (year, yday, hour, min, sec, &ot, &otm); - ranged_convert (convert, &t, &tm); - goto offset_found; - } - } + { + long_int ot; + if (! INT_ADD_WRAPV (t, delta * direction, &ot)) + { + struct tm otm; + ranged_convert (convert, &ot, &otm); + if (! isdst_differ (isdst, otm.tm_isdst)) + { + /* We found the desired tm_isdst. + Extrapolate back to the desired time. */ + t = guess_time_tm (year, yday, hour, min, sec, ot, &otm); + ranged_convert (convert, &t, &tm); + goto offset_found; + } + } + } } offset_found: - *offset = guessed_offset + t - t0; + /* Set *OFFSET to the low-order bits of T - T0 - NEGATIVE_OFFSET_GUESS. + This is just a heuristic to speed up the next mktime call, and + correctness is unaffected if integer overflow occurs here. */ + INT_SUBTRACT_WRAPV (t, t0, &dt); + INT_SUBTRACT_WRAPV (dt, negative_offset_guess, offset); if (LEAP_SECONDS_POSSIBLE && sec_requested != tm.tm_sec) { /* Adjust time to reflect the tm_sec requested, not the normalized value. Also, repair any damage from a false match due to a leap second. */ - int sec_adjustment = (sec == 0 && tm.tm_sec == 60) - sec; - if (! time_t_int_add_ok (t, sec_requested)) + long_int sec_adjustment = sec == 0 && tm.tm_sec == 60; + sec_adjustment -= sec; + sec_adjustment += sec_requested; + if (INT_ADD_WRAPV (t, sec_adjustment, &t) + || ! (mktime_min <= t && t <= mktime_max) + || ! convert_time (convert, t, &tm)) return -1; - t1 = t + sec_requested; - if (! time_t_int_add_ok (t1, sec_adjustment)) - return -1; - t2 = t1 + sec_adjustment; - if (! convert (&t2, &tm)) - return -1; - t = t2; } *tp = tm; @@ -571,11 +459,7 @@ __mktime_internal (struct tm *tp, } -/* FIXME: This should use a signed type wide enough to hold any UTC - offset in seconds. 'int' should be good enough for GNU code. We - can't fix this unilaterally though, as other modules invoke - __mktime_internal. */ -static time_t localtime_offset; +static mktime_offset_t localtime_offset; /* Convert *TP to a time_t value. */ time_t @@ -600,7 +484,7 @@ libc_hidden_def (mktime) libc_hidden_weak (timelocal) #endif -#if defined DEBUG_MKTIME && DEBUG_MKTIME +#if DEBUG_MKTIME static int not_equal_tm (const struct tm *a, const struct tm *b) @@ -652,6 +536,14 @@ main (int argc, char **argv) time_t tk, tl, tl1; char trailer; + /* Sanity check, plus call tzset. */ + tl = 0; + if (! localtime (&tl)) + { + printf ("localtime (0) fails\n"); + status = 1; + } + if ((argc == 3 || argc == 4) && (sscanf (argv[1], "%d-%d-%d%c", &tm.tm_year, &tm.tm_mon, &tm.tm_mday, &trailer) @@ -665,12 +557,7 @@ main (int argc, char **argv) tm.tm_isdst = argc == 3 ? -1 : atoi (argv[3]); tmk = tm; tl = mktime (&tmk); - lt = localtime (&tl); - if (lt) - { - tml = *lt; - lt = &tml; - } + lt = localtime_r (&tl, &tml); printf ("mktime returns %ld == ", (long int) tl); print_tm (&tmk); printf ("\n"); @@ -685,16 +572,16 @@ main (int argc, char **argv) if (argc == 4) for (tl = from; by < 0 ? to <= tl : tl <= to; tl = tl1) { - lt = localtime (&tl); + lt = localtime_r (&tl, &tml); if (lt) { - tmk = tml = *lt; + tmk = tml; tk = mktime (&tmk); status |= check_result (tk, tmk, tl, &tml); } else { - printf ("localtime (%ld) yields 0\n", (long int) tl); + printf ("localtime_r (%ld) yields 0\n", (long int) tl); status = 1; } tl1 = tl + by; @@ -705,16 +592,16 @@ main (int argc, char **argv) for (tl = from; by < 0 ? to <= tl : tl <= to; tl = tl1) { /* Null benchmark. */ - lt = localtime (&tl); + lt = localtime_r (&tl, &tml); if (lt) { - tmk = tml = *lt; + tmk = tml; tk = tl; status |= check_result (tk, tmk, tl, &tml); } else { - printf ("localtime (%ld) yields 0\n", (long int) tl); + printf ("localtime_r (%ld) yields 0\n", (long int) tl); status = 1; } tl1 = tl + by; diff --git a/lib/strtol.c b/lib/strtol.c index b0215fce76b..6ef8a9624c9 100644 --- a/lib/strtol.c +++ b/lib/strtol.c @@ -121,30 +121,19 @@ /* The extra casts in the following macros work around compiler bugs, e.g., in Cray C 5.0.3.0. */ -/* True if negative values of the signed integer type T use two's - complement, ones' complement, or signed magnitude representation, - respectively. Much GNU code assumes two's complement, but some - people like to be portable to all possible C hosts. */ -# define TYPE_TWOS_COMPLEMENT(t) ((t) ~ (t) 0 == (t) -1) -# define TYPE_ONES_COMPLEMENT(t) ((t) ~ (t) 0 == 0) -# define TYPE_SIGNED_MAGNITUDE(t) ((t) ~ (t) 0 < (t) -1) - /* True if the arithmetic type T is signed. */ # define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) -/* The maximum and minimum values for the integer type T. These - macros have undefined behavior if T is signed and has padding bits. - If this is a problem for you, please let us know how to fix it for - your host. */ -# define TYPE_MINIMUM(t) \ - ((t) (! TYPE_SIGNED (t) \ - ? (t) 0 \ - : TYPE_SIGNED_MAGNITUDE (t) \ - ? ~ (t) 0 \ - : ~ TYPE_MAXIMUM (t))) -# define TYPE_MAXIMUM(t) \ - ((t) (! TYPE_SIGNED (t) \ - ? (t) -1 \ +/* Minimum and maximum values for integer types. + These macros have undefined behavior for signed types that either + have padding bits or do not use two's complement. If this is a + problem for you, please let us know how to fix it for your host. */ + +/* The maximum and minimum values for the integer type T. */ +# define TYPE_MINIMUM(t) ((t) ~ TYPE_MAXIMUM (t)) +# define TYPE_MAXIMUM(t) \ + ((t) (! TYPE_SIGNED (t) \ + ? (t) -1 \ : ((((t) 1 << (sizeof (t) * CHAR_BIT - 2)) - 1) * 2 + 1))) # ifndef ULLONG_MAX diff --git a/lib/timegm.c b/lib/timegm.c index 86bdac3f43e..bf61244acd5 100644 --- a/lib/timegm.c +++ b/lib/timegm.c @@ -22,7 +22,9 @@ #include -#ifndef _LIBC +#ifdef _LIBC +typedef time_t mktime_offset_t; +#else # undef __gmtime_r # define __gmtime_r gmtime_r # define __mktime_internal mktime_internal @@ -32,7 +34,7 @@ time_t timegm (struct tm *tmp) { - static time_t gmtime_offset; + static mktime_offset_t gmtime_offset; tmp->tm_isdst = 0; return __mktime_internal (tmp, __gmtime_r, &gmtime_offset); } diff --git a/m4/mktime.m4 b/m4/mktime.m4 index 78f16ba66ae..5a0f2d88ab0 100644 --- a/m4/mktime.m4 +++ b/m4/mktime.m4 @@ -1,4 +1,4 @@ -# serial 25 +# serial 26 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2016 Free Software Foundation, dnl Inc. dnl This file is free software; the Free Software Foundation @@ -7,9 +7,24 @@ dnl with or without modifications, as long as this notice is preserved. dnl From Jim Meyering. +AC_DEFUN([gl_TIME_T_IS_SIGNED], +[ + AC_CACHE_CHECK([whether time_t is signed], + [gl_cv_time_t_is_signed], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM([[#include + char time_t_signed[(time_t) -1 < 0 ? 1 : -1];]])], + [gl_cv_time_t_is_signed=yes], + [gl_cv_time_t_is_signed=no])]) + if test $gl_cv_time_t_is_signed = yes; then + AC_DEFINE([TIME_T_IS_SIGNED], [1], [Define to 1 if time_t is signed.]) + fi +]) + AC_DEFUN([gl_FUNC_MKTIME], [ AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS]) + AC_REQUIRE([gl_TIME_T_IS_SIGNED]) dnl We don't use AC_FUNC_MKTIME any more, because it is no longer maintained dnl in Autoconf and because it invokes AC_LIBOBJ. @@ -169,7 +184,6 @@ main () time_t t, delta; int i, j; int time_t_signed_magnitude = (time_t) ~ (time_t) 0 < (time_t) -1; - int time_t_signed = ! ((time_t) 0 < (time_t) -1); #if HAVE_DECL_ALARM /* This test makes some buggy mktime implementations loop. @@ -179,11 +193,11 @@ main () alarm (60); #endif - time_t_max = (! time_t_signed + time_t_max = (! TIME_T_IS_SIGNED ? (time_t) -1 : ((((time_t) 1 << (sizeof (time_t) * CHAR_BIT - 2)) - 1) * 2 + 1)); - time_t_min = (! time_t_signed + time_t_min = (! TIME_T_IS_SIGNED ? (time_t) 0 : time_t_signed_magnitude ? ~ (time_t) 0 diff --git a/m4/std-gnu11.m4 b/m4/std-gnu11.m4 index e8d3ebcf2fd..10da26f1302 100644 --- a/m4/std-gnu11.m4 +++ b/m4/std-gnu11.m4 @@ -1,8 +1,8 @@ # Prefer GNU C11 and C++11 to earlier versions. -*- coding: utf-8 -*- # This implementation is taken from GNU Autoconf lib/autoconf/c.m4 -# commit 739cdc82b5325402231f3f5e1a38f681fcbd1db2 -# dated Tue Mar 15 09:34:11 2016 -0700. +# commit 017d5ddd82854911f0119691d91ea8a1438824d6 +# dated Sun Apr 3 13:57:17 2016 -0700 # This implementation will be obsolete once we can assume Autoconf 2.70 # or later is installed everywhere a Gnulib program might be developed. @@ -707,7 +707,7 @@ AC_DEFUN([_AC_CXX_CXX11_TEST_BODY], short sa[cxx11test::get_val()] = { 0 }; } { - // Test initialiser lists + // Test initializer lists cxx11test::testinit il = { 4323, 435234.23544 }; } { @@ -801,7 +801,7 @@ dnl with extended modes being tried first. # considers the compiler to be in ISO C++11 mode if it handles all the # tests from the C++98 checks, plus the following: Language features # (auto, constexpr, decltype, default/deleted constructors, delegate -# constructors, final, initialiser lists, lambda functions, nullptr, +# constructors, final, initializer lists, lambda functions, nullptr, # override, range-based for loops, template brackets without spaces, # unicode literals) and library features (array, memory (shared_ptr, # weak_ptr), regex and tuple types). -- 2.39.2