%{
/* Parse a string into an internal time stamp.
- Copyright (C) 1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
+
+ Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007 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
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Originally written by Steven M. Bellovin <smb@research.att.com> while
at the University of North Carolina at Chapel Hill. Later tweaked by
<rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990.
Modified by Paul Eggert <eggert@twinsun.com> in August 1999 to do
- the right thing about local DST, and in February 2004 to support
- nanosecond-resolution time stamps. Unlike previous versions, this
- version is reentrant. */
+ the right thing about local DST. Also modified by Paul Eggert
+ <eggert@cs.ucla.edu> in February 2004 to support
+ nanosecond-resolution time stamps, and in October 2004 to support
+ TZ strings in dates. */
/* FIXME: Check for arithmetic overflow in all cases, not just
- some of them.
-
- FIXME: The current code uses 'int' to count seconds; it should use
- something like 'intmax_t' to support time stamps that don't fit in
- 32 bits. */
+ some of them. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "getdate.h"
+#include "timespec.h"
-#include <alloca.h>
+/* There's no need to extend the stack, so there's no need to involve
+ alloca. */
+#define YYSTACK_USE_ALLOCA 0
+
+/* Tell Bison how much stack space is needed. 20 should be plenty for
+ this grammar, which is not right recursive. Beware setting it too
+ high, since that might cause problems on machines whose
+ implementations have lame stack-overflow checking. */
+#define YYMAXDEPTH 20
+#define YYINITDEPTH YYMAXDEPTH
/* Since the code of getdate.y is not included in the Emacs executable
itself, there is no need to #define static in this file. Even if
#include <ctype.h>
#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
-#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
-# define IN_CTYPE_DOMAIN(c) 1
-#else
-# define IN_CTYPE_DOMAIN(c) isascii (c)
-#endif
+#include "setenv.h"
+#include "xalloc.h"
-#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
-#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
-#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
-#define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
-/* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
- - Its arg may be any int or unsigned int; it need not be an unsigned char.
- - It's guaranteed to evaluate its argument exactly once.
+/* ISDIGIT differs from isdigit, as follows:
+ - Its arg may be any int or unsigned int; it need not be an unsigned char
+ or EOF.
- It's typically faster.
POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
- ISDIGIT_LOCALE unless it's important to use the locale's definition
+ isdigit unless it's important to use the locale's definition
of `digit' even when the host does not conform to POSIX. */
#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
-#include <string.h>
-
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
-# define __attribute__(x)
+#ifndef __attribute__
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
+# define __attribute__(x)
+# endif
#endif
#ifndef ATTRIBUTE_UNUSED
# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
#endif
+/* 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.
+
+ 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 \
+ ? (a) >> (b) \
+ : (a) / (1 << (b)) - ((a) % (1 << (b)) < 0))
+
#define EPOCH_YEAR 1970
#define TM_YEAR_BASE 1900
representation. */
typedef struct
{
+ bool negative;
long int value;
size_t digits;
} textint;
enum { BILLION = 1000000000, LOG10_BILLION = 9 };
+/* Relative times. */
+typedef struct
+{
+ /* Relative year, month, day, hour, minutes, seconds, and nanoseconds. */
+ long int year;
+ long int month;
+ long int day;
+ long int hour;
+ long int minutes;
+ long int seconds;
+ long int ns;
+} relative_time;
+
+#if HAVE_COMPOUND_LITERALS
+# define RELATIVE_TIME_0 ((relative_time) { 0, 0, 0, 0, 0, 0, 0 })
+#else
+static relative_time const RELATIVE_TIME_0;
+#endif
+
/* Information passed to and from the parser. */
typedef struct
{
struct timespec seconds; /* includes nanoseconds */
/* Relative year, month, day, hour, minutes, seconds, and nanoseconds. */
- long int rel_year;
- long int rel_month;
- long int rel_day;
- long int rel_hour;
- long int rel_minutes;
- long int rel_seconds;
- long int rel_ns;
-
- /* Counts of nonterminals of various flavors parsed so far. */
+ relative_time rel;
+
+ /* Presence or counts of nonterminals of various flavors parsed so far. */
bool timespec_seen;
+ bool rels_seen;
size_t dates_seen;
size_t days_seen;
size_t local_zones_seen;
- size_t rels_seen;
+ size_t dsts_seen;
size_t times_seen;
size_t zones_seen;
union YYSTYPE;
static int yylex (union YYSTYPE *, parser_control *);
-static int yyerror (parser_control *, char *);
+static int yyerror (parser_control const *, char const *);
+static long int time_zone_hhmm (textint, long int);
%}
-/* We want a reentrant parser. */
+/* We want a reentrant parser, even if the TZ manipulation and the calls to
+ localtime and gmtime are not reentrant. */
%pure-parser
%parse-param { parser_control *pc }
%lex-param { parser_control *pc }
-/* This grammar has 13 shift/reduce conflicts. */
-%expect 13
+/* This grammar has 20 shift/reduce conflicts. */
+%expect 20
%union
{
long int intval;
textint textintval;
struct timespec timespec;
+ relative_time rel;
}
%token tAGO tDST
-%token <intval> tDAY tDAY_UNIT tDAYZONE tHOUR_UNIT tLOCAL_ZONE tMERIDIAN
-%token <intval> tMINUTE_UNIT tMONTH tMONTH_UNIT tSEC_UNIT tYEAR_UNIT tZONE
+%token tYEAR_UNIT tMONTH_UNIT tHOUR_UNIT tMINUTE_UNIT tSEC_UNIT
+%token <intval> tDAY_UNIT
+
+%token <intval> tDAY tDAYZONE tLOCAL_ZONE tMERIDIAN
+%token <intval> tMONTH tORDINAL tZONE
%token <textintval> tSNUMBER tUNUMBER
%token <timespec> tSDECIMAL_NUMBER tUDECIMAL_NUMBER
-%type <intval> o_merid
+%type <intval> o_colon_minutes o_merid
%type <timespec> seconds signed_seconds unsigned_seconds
+%type <rel> relunit relunit_snumber
+
%%
spec:
| day
{ pc->days_seen++; }
| rel
- { pc->rels_seen++; }
+ { pc->rels_seen = true; }
| number
;
pc->seconds.tv_nsec = 0;
pc->meridian = $4;
}
- | tUNUMBER ':' tUNUMBER tSNUMBER
+ | tUNUMBER ':' tUNUMBER tSNUMBER o_colon_minutes
{
pc->hour = $1.value;
pc->minutes = $3.value;
pc->seconds.tv_nsec = 0;
pc->meridian = MER24;
pc->zones_seen++;
- pc->time_zone = $4.value % 100 + ($4.value / 100) * 60;
+ pc->time_zone = time_zone_hhmm ($4, $5);
}
| tUNUMBER ':' tUNUMBER ':' unsigned_seconds o_merid
{
pc->seconds = $5;
pc->meridian = $6;
}
- | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tSNUMBER
+ | tUNUMBER ':' tUNUMBER ':' unsigned_seconds tSNUMBER o_colon_minutes
{
pc->hour = $1.value;
pc->minutes = $3.value;
pc->seconds = $5;
pc->meridian = MER24;
pc->zones_seen++;
- pc->time_zone = $6.value % 100 + ($6.value / 100) * 60;
+ pc->time_zone = time_zone_hhmm ($6, $7);
}
;
local_zone:
tLOCAL_ZONE
- { pc->local_isdst = $1; }
+ {
+ pc->local_isdst = $1;
+ pc->dsts_seen += (0 < $1);
+ }
| tLOCAL_ZONE tDST
- { pc->local_isdst = $1 < 0 ? 1 : $1 + 1; }
+ {
+ pc->local_isdst = 1;
+ pc->dsts_seen += (0 < $1) + 1;
+ }
;
zone:
tZONE
{ pc->time_zone = $1; }
+ | tZONE relunit_snumber
+ { pc->time_zone = $1;
+ pc->rel.ns += $2.ns;
+ pc->rel.seconds += $2.seconds;
+ pc->rel.minutes += $2.minutes;
+ pc->rel.hour += $2.hour;
+ pc->rel.day += $2.day;
+ pc->rel.month += $2.month;
+ pc->rel.year += $2.year;
+ pc->rels_seen = true; }
+ | tZONE tSNUMBER o_colon_minutes
+ { pc->time_zone = $1 + time_zone_hhmm ($2, $3); }
| tDAYZONE
{ pc->time_zone = $1 + 60; }
| tZONE tDST
pc->day_ordinal = 1;
pc->day_number = $1;
}
+ | tORDINAL tDAY
+ {
+ pc->day_ordinal = $1;
+ pc->day_number = $2;
+ }
| tUNUMBER tDAY
{
pc->day_ordinal = $1.value;
rel:
relunit tAGO
{
- pc->rel_ns = -pc->rel_ns;
- pc->rel_seconds = -pc->rel_seconds;
- pc->rel_minutes = -pc->rel_minutes;
- pc->rel_hour = -pc->rel_hour;
- pc->rel_day = -pc->rel_day;
- pc->rel_month = -pc->rel_month;
- pc->rel_year = -pc->rel_year;
+ pc->rel.ns -= $1.ns;
+ pc->rel.seconds -= $1.seconds;
+ pc->rel.minutes -= $1.minutes;
+ pc->rel.hour -= $1.hour;
+ pc->rel.day -= $1.day;
+ pc->rel.month -= $1.month;
+ pc->rel.year -= $1.year;
}
| relunit
+ {
+ pc->rel.ns += $1.ns;
+ pc->rel.seconds += $1.seconds;
+ pc->rel.minutes += $1.minutes;
+ pc->rel.hour += $1.hour;
+ pc->rel.day += $1.day;
+ pc->rel.month += $1.month;
+ pc->rel.year += $1.year;
+ }
;
relunit:
- tUNUMBER tYEAR_UNIT
- { pc->rel_year += $1.value * $2; }
- | tSNUMBER tYEAR_UNIT
- { pc->rel_year += $1.value * $2; }
+ tORDINAL tYEAR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.year = $1; }
+ | tUNUMBER tYEAR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.year = $1.value; }
| tYEAR_UNIT
- { pc->rel_year += $1; }
+ { $$ = RELATIVE_TIME_0; $$.year = 1; }
+ | tORDINAL tMONTH_UNIT
+ { $$ = RELATIVE_TIME_0; $$.month = $1; }
| tUNUMBER tMONTH_UNIT
- { pc->rel_month += $1.value * $2; }
- | tSNUMBER tMONTH_UNIT
- { pc->rel_month += $1.value * $2; }
+ { $$ = RELATIVE_TIME_0; $$.month = $1.value; }
| tMONTH_UNIT
- { pc->rel_month += $1; }
+ { $$ = RELATIVE_TIME_0; $$.month = 1; }
+ | tORDINAL tDAY_UNIT
+ { $$ = RELATIVE_TIME_0; $$.day = $1 * $2; }
| tUNUMBER tDAY_UNIT
- { pc->rel_day += $1.value * $2; }
- | tSNUMBER tDAY_UNIT
- { pc->rel_day += $1.value * $2; }
+ { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; }
| tDAY_UNIT
- { pc->rel_day += $1; }
+ { $$ = RELATIVE_TIME_0; $$.day = $1; }
+ | tORDINAL tHOUR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.hour = $1; }
| tUNUMBER tHOUR_UNIT
- { pc->rel_hour += $1.value * $2; }
- | tSNUMBER tHOUR_UNIT
- { pc->rel_hour += $1.value * $2; }
+ { $$ = RELATIVE_TIME_0; $$.hour = $1.value; }
| tHOUR_UNIT
- { pc->rel_hour += $1; }
+ { $$ = RELATIVE_TIME_0; $$.hour = 1; }
+ | tORDINAL tMINUTE_UNIT
+ { $$ = RELATIVE_TIME_0; $$.minutes = $1; }
| tUNUMBER tMINUTE_UNIT
- { pc->rel_minutes += $1.value * $2; }
- | tSNUMBER tMINUTE_UNIT
- { pc->rel_minutes += $1.value * $2; }
+ { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; }
| tMINUTE_UNIT
- { pc->rel_minutes += $1; }
+ { $$ = RELATIVE_TIME_0; $$.minutes = 1; }
+ | tORDINAL tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1; }
| tUNUMBER tSEC_UNIT
- { pc->rel_seconds += $1.value * $2; }
- | tSNUMBER tSEC_UNIT
- { pc->rel_seconds += $1.value * $2; }
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; }
| tSDECIMAL_NUMBER tSEC_UNIT
- { pc->rel_seconds += $1.tv_sec * $2; pc->rel_ns += $1.tv_nsec * $2; }
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.tv_sec; $$.ns = $1.tv_nsec; }
| tUDECIMAL_NUMBER tSEC_UNIT
- { pc->rel_seconds += $1.tv_sec * $2; pc->rel_ns += $1.tv_nsec * $2; }
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.tv_sec; $$.ns = $1.tv_nsec; }
| tSEC_UNIT
- { pc->rel_seconds += $1; }
+ { $$ = RELATIVE_TIME_0; $$.seconds = 1; }
+ | relunit_snumber
+ ;
+
+relunit_snumber:
+ tSNUMBER tYEAR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.year = $1.value; }
+ | tSNUMBER tMONTH_UNIT
+ { $$ = RELATIVE_TIME_0; $$.month = $1.value; }
+ | tSNUMBER tDAY_UNIT
+ { $$ = RELATIVE_TIME_0; $$.day = $1.value * $2; }
+ | tSNUMBER tHOUR_UNIT
+ { $$ = RELATIVE_TIME_0; $$.hour = $1.value; }
+ | tSNUMBER tMINUTE_UNIT
+ { $$ = RELATIVE_TIME_0; $$.minutes = $1.value; }
+ | tSNUMBER tSEC_UNIT
+ { $$ = RELATIVE_TIME_0; $$.seconds = $1.value; }
;
seconds: signed_seconds | unsigned_seconds;
number:
tUNUMBER
{
- if (pc->dates_seen
+ if (pc->dates_seen && ! pc->year.digits
&& ! pc->rels_seen && (pc->times_seen || 2 < $1.digits))
pc->year = $1;
else
}
;
+o_colon_minutes:
+ /* empty */
+ { $$ = -1; }
+ | ':' tUNUMBER
+ { $$ = $2.value; }
+ ;
+
o_merid:
/* empty */
{ $$ = MER24; }
{ "YESTERDAY",tDAY_UNIT, -1 },
{ "TODAY", tDAY_UNIT, 0 },
{ "NOW", tDAY_UNIT, 0 },
- { "LAST", tUNUMBER, -1 },
- { "THIS", tUNUMBER, 0 },
- { "NEXT", tUNUMBER, 1 },
- { "FIRST", tUNUMBER, 1 },
-/*{ "SECOND", tUNUMBER, 2 }, */
- { "THIRD", tUNUMBER, 3 },
- { "FOURTH", tUNUMBER, 4 },
- { "FIFTH", tUNUMBER, 5 },
- { "SIXTH", tUNUMBER, 6 },
- { "SEVENTH", tUNUMBER, 7 },
- { "EIGHTH", tUNUMBER, 8 },
- { "NINTH", tUNUMBER, 9 },
- { "TENTH", tUNUMBER, 10 },
- { "ELEVENTH", tUNUMBER, 11 },
- { "TWELFTH", tUNUMBER, 12 },
+ { "LAST", tORDINAL, -1 },
+ { "THIS", tORDINAL, 0 },
+ { "NEXT", tORDINAL, 1 },
+ { "FIRST", tORDINAL, 1 },
+/*{ "SECOND", tORDINAL, 2 }, */
+ { "THIRD", tORDINAL, 3 },
+ { "FOURTH", tORDINAL, 4 },
+ { "FIFTH", tORDINAL, 5 },
+ { "SIXTH", tORDINAL, 6 },
+ { "SEVENTH", tORDINAL, 7 },
+ { "EIGHTH", tORDINAL, 8 },
+ { "NINTH", tORDINAL, 9 },
+ { "TENTH", tORDINAL, 10 },
+ { "ELEVENTH", tORDINAL, 11 },
+ { "TWELFTH", tORDINAL, 12 },
{ "AGO", tAGO, 1 },
{ NULL, 0, 0 }
};
+/* The universal time zone table. These labels can be used even for
+ time stamps that would not otherwise be valid, e.g., GMT time
+ stamps in London during summer. */
+static table const universal_time_zone_table[] =
+{
+ { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */
+ { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
+ { "UTC", tZONE, HOUR ( 0) },
+ { NULL, 0, 0 }
+};
+
/* The time zone table. This table is necessarily incomplete, as time
zone abbreviations are ambiguous; e.g. Australians interpret "EST"
as Eastern time in Australia, not as US Eastern Standard Time.
abbreviations; use numeric abbreviations like `-0500' instead. */
static table const time_zone_table[] =
{
- { "GMT", tZONE, HOUR ( 0) }, /* Greenwich Mean */
- { "UT", tZONE, HOUR ( 0) }, /* Universal (Coordinated) */
- { "UTC", tZONE, HOUR ( 0) },
{ "WET", tZONE, HOUR ( 0) }, /* Western European */
{ "WEST", tDAYZONE, HOUR ( 0) }, /* Western European Summer */
{ "BST", tDAYZONE, HOUR ( 0) }, /* British Summer */
{ "GST", tZONE, HOUR (10) }, /* Guam Standard */
{ "NZST", tZONE, HOUR (12) }, /* New Zealand Standard */
{ "NZDT", tDAYZONE, HOUR (12) }, /* New Zealand Daylight */
- { NULL, 0, 0 }
+ { NULL, 0, 0 }
};
/* Military time zone table. */
\f
+/* Convert a time zone expressed as HH:MM into an integer count of
+ minutes. If MM is negative, then S is of the form HHMM and needs
+ to be picked apart; otherwise, S is of the form HH. */
+
+static long int
+time_zone_hhmm (textint s, long int mm)
+{
+ if (mm < 0)
+ return (s.value / 100) * 60 + s.value % 100;
+ else
+ return s.value * 60 + (s.negative ? -mm : mm);
+}
+
static int
to_hour (long int hours, int meridian)
{
{
table const *tp;
- /* Try local zone abbreviations first; they're more likely to be right. */
+ for (tp = universal_time_zone_table; tp->name; tp++)
+ if (strcmp (name, tp->name) == 0)
+ return tp;
+
+ /* Try local zone abbreviations before those in time_zone_table, as
+ the local ones are more likely to be right. */
for (tp = pc->local_time_zone_table; tp->name; tp++)
if (strcmp (name, tp->name) == 0)
return tp;
{
/* Compute intervening leap days correctly even if year is negative.
Take care to avoid int overflow in leap day calculations. */
- int a4 = (a->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (a->tm_year & 3);
- int b4 = (b->tm_year >> 2) + (TM_YEAR_BASE >> 2) - ! (b->tm_year & 3);
+ int a4 = SHR (a->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (a->tm_year & 3);
+ int b4 = SHR (b->tm_year, 2) + SHR (TM_YEAR_BASE, 2) - ! (b->tm_year & 3);
int a100 = a4 / 25 - (a4 % 25 < 0);
int b100 = b4 / 25 - (b4 % 25 < 0);
- int a400 = a100 >> 2;
- int b400 = b100 >> 2;
+ int a400 = SHR (a100, 2);
+ int b400 = SHR (b100, 2);
int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
long int ayear = a->tm_year;
long int years = ayear - b->tm_year;
for (p = word; *p; p++)
{
unsigned char ch = *p;
- if (ISLOWER (ch))
- *p = toupper (ch);
+ *p = toupper (ch);
}
for (tp = meridian_table; tp->name; tp++)
for (;;)
{
- while (c = *pc->input, ISSPACE (c))
+ while (c = *pc->input, isspace (c))
pc->input++;
if (ISDIGIT (c) || c == '-' || c == '+')
if (c == '-' || c == '+')
{
sign = c == '-' ? -1 : 1;
- while (c = *++pc->input, ISSPACE (c))
+ while (c = *++pc->input, isspace (c))
continue;
if (! ISDIGIT (c))
/* skip the '-' sign */
}
else
{
+ lvalp->textintval.negative = sign < 0;
if (sign < 0)
{
lvalp->textintval.value = - value;
}
}
- if (ISALPHA (c))
+ if (isalpha (c))
{
char buff[20];
char *p = buff;
*p++ = c;
c = *++pc->input;
}
- while (ISALPHA (c) || c == '.');
+ while (isalpha (c) || c == '.');
*p = '\0';
tp = lookup_word (pc, buff);
/* Do nothing if the parser reports an error. */
static int
-yyerror (parser_control *pc ATTRIBUTE_UNUSED, char *s ATTRIBUTE_UNUSED)
+yyerror (parser_control const *pc ATTRIBUTE_UNUSED,
+ char const *s ATTRIBUTE_UNUSED)
{
return 0;
}
+/* If *TM0 is the old and *TM1 is the new value of a struct tm after
+ passing it to mktime, return true if it's OK that mktime returned T.
+ It's not OK if *TM0 has out-of-range members. */
+
+static bool
+mktime_ok (struct tm const *tm0, struct tm const *tm1, time_t t)
+{
+ if (t == (time_t) -1)
+ {
+ /* Guard against falsely reporting an error when parsing a time
+ stamp that happens to equal (time_t) -1, on a host that
+ supports such a time stamp. */
+ tm1 = localtime (&t);
+ if (!tm1)
+ return false;
+ }
+
+ return ! ((tm0->tm_sec ^ tm1->tm_sec)
+ | (tm0->tm_min ^ tm1->tm_min)
+ | (tm0->tm_hour ^ tm1->tm_hour)
+ | (tm0->tm_mday ^ tm1->tm_mday)
+ | (tm0->tm_mon ^ tm1->tm_mon)
+ | (tm0->tm_year ^ tm1->tm_year));
+}
+
+/* A reasonable upper bound for the size of ordinary TZ strings.
+ Use heap allocation if TZ's length exceeds this. */
+enum { TZBUFSIZE = 100 };
+
+/* Return a copy of TZ, stored in TZBUF if it fits, and heap-allocated
+ otherwise. */
+static char *
+get_tz (char tzbuf[TZBUFSIZE])
+{
+ char *tz = getenv ("TZ");
+ if (tz)
+ {
+ size_t tzsize = strlen (tz) + 1;
+ tz = (tzsize <= TZBUFSIZE
+ ? memcpy (tzbuf, tz, tzsize)
+ : xmemdup (tz, tzsize));
+ }
+ return tz;
+}
+
/* Parse a date/time string, storing the resulting time value into *RESULT.
The string itself is pointed to by P. Return true if successful.
P can be an incomplete or relative time specification; if so, use
struct tm tm0;
parser_control pc;
struct timespec gettime_buffer;
+ unsigned char c;
+ bool tz_was_altered = false;
+ char *tz0 = NULL;
+ char tz0buf[TZBUFSIZE];
+ bool ok = true;
if (! now)
{
- if (gettime (&gettime_buffer) != 0)
- return false;
+ gettime (&gettime_buffer);
now = &gettime_buffer;
}
if (! tmp)
return false;
+ while (c = *p, isspace (c))
+ p++;
+
+ if (strncmp (p, "TZ=\"", 4) == 0)
+ {
+ char const *tzbase = p + 4;
+ size_t tzsize = 1;
+ char const *s;
+
+ for (s = tzbase; *s; s++, tzsize++)
+ if (*s == '\\')
+ {
+ s++;
+ if (! (*s == '\\' || *s == '"'))
+ break;
+ }
+ else if (*s == '"')
+ {
+ char *z;
+ char *tz1;
+ char tz1buf[TZBUFSIZE];
+ bool large_tz = TZBUFSIZE < tzsize;
+ bool setenv_ok;
+ tz0 = get_tz (tz0buf);
+ z = tz1 = large_tz ? xmalloc (tzsize) : tz1buf;
+ for (s = tzbase; *s != '"'; s++)
+ *z++ = *(s += *s == '\\');
+ *z = '\0';
+ setenv_ok = setenv ("TZ", tz1, 1) == 0;
+ if (large_tz)
+ free (tz1);
+ if (!setenv_ok)
+ goto fail;
+ tz_was_altered = true;
+ p = s + 1;
+ }
+ }
+
pc.input = p;
pc.year.value = tmp->tm_year;
pc.year.value += TM_YEAR_BASE;
- pc.year.digits = 4;
+ pc.year.digits = 0;
pc.month = tmp->tm_mon + 1;
pc.day = tmp->tm_mday;
pc.hour = tmp->tm_hour;
tm.tm_isdst = tmp->tm_isdst;
pc.meridian = MER24;
- pc.rel_ns = 0;
- pc.rel_seconds = 0;
- pc.rel_minutes = 0;
- pc.rel_hour = 0;
- pc.rel_day = 0;
- pc.rel_month = 0;
- pc.rel_year = 0;
+ pc.rel = RELATIVE_TIME_0;
pc.timespec_seen = false;
+ pc.rels_seen = false;
pc.dates_seen = 0;
pc.days_seen = 0;
- pc.rels_seen = 0;
pc.times_seen = 0;
pc.local_zones_seen = 0;
+ pc.dsts_seen = 0;
pc.zones_seen = 0;
#if HAVE_STRUCT_TM_TM_ZONE
}
if (yyparse (&pc) != 0)
- return false;
+ goto fail;
if (pc.timespec_seen)
- {
- *result = pc.seconds;
- return true;
- }
-
- if (1 < pc.times_seen || 1 < pc.dates_seen || 1 < pc.days_seen
- || 1 < (pc.local_zones_seen + pc.zones_seen)
- || (pc.local_zones_seen && 1 < pc.local_isdst))
- return false;
-
- tm.tm_year = to_year (pc.year) - TM_YEAR_BASE + pc.rel_year;
- tm.tm_mon = pc.month - 1 + pc.rel_month;
- tm.tm_mday = pc.day + pc.rel_day;
- if (pc.times_seen || (pc.rels_seen && ! pc.dates_seen && ! pc.days_seen))
- {
- tm.tm_hour = to_hour (pc.hour, pc.meridian);
- if (tm.tm_hour < 0)
- return false;
- tm.tm_min = pc.minutes;
- tm.tm_sec = pc.seconds.tv_sec;
- }
+ *result = pc.seconds;
else
{
- tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
- pc.seconds.tv_nsec = 0;
- }
-
- /* Let mktime deduce tm_isdst if we have an absolute time stamp,
- or if the relative time stamp mentions days, months, or years. */
- if (pc.dates_seen | pc.days_seen | pc.times_seen | pc.rel_day
- | pc.rel_month | pc.rel_year)
- tm.tm_isdst = -1;
+ if (1 < (pc.times_seen | pc.dates_seen | pc.days_seen | pc.dsts_seen
+ | (pc.local_zones_seen + pc.zones_seen)))
+ goto fail;
+
+ tm.tm_year = to_year (pc.year) - TM_YEAR_BASE;
+ tm.tm_mon = pc.month - 1;
+ tm.tm_mday = pc.day;
+ if (pc.times_seen || (pc.rels_seen && ! pc.dates_seen && ! pc.days_seen))
+ {
+ tm.tm_hour = to_hour (pc.hour, pc.meridian);
+ if (tm.tm_hour < 0)
+ goto fail;
+ tm.tm_min = pc.minutes;
+ tm.tm_sec = pc.seconds.tv_sec;
+ }
+ else
+ {
+ tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
+ pc.seconds.tv_nsec = 0;
+ }
- /* But if the input explicitly specifies local time with or without
- DST, give mktime that information. */
- if (pc.local_zones_seen)
- tm.tm_isdst = pc.local_isdst;
+ /* Let mktime deduce tm_isdst if we have an absolute time stamp. */
+ if (pc.dates_seen | pc.days_seen | pc.times_seen)
+ tm.tm_isdst = -1;
- tm0 = tm;
+ /* But if the input explicitly specifies local time with or without
+ DST, give mktime that information. */
+ if (pc.local_zones_seen)
+ tm.tm_isdst = pc.local_isdst;
- Start = mktime (&tm);
+ tm0 = tm;
- if (Start == (time_t) -1)
- {
+ Start = mktime (&tm);
- /* Guard against falsely reporting errors near the time_t boundaries
- when parsing times in other time zones. For example, if the min
- time_t value is 1970-01-01 00:00:00 UTC and we are 8 hours ahead
- of UTC, then the min localtime value is 1970-01-01 08:00:00; if
- we apply mktime to 1970-01-01 00:00:00 we will get an error, so
- we apply mktime to 1970-01-02 08:00:00 instead and adjust the time
- zone by 24 hours to compensate. This algorithm assumes that
- there is no DST transition within a day of the time_t boundaries. */
- if (pc.zones_seen)
+ if (! mktime_ok (&tm0, &tm, Start))
{
- tm = tm0;
- if (tm.tm_year <= EPOCH_YEAR - TM_YEAR_BASE)
- {
- tm.tm_mday++;
- pc.time_zone += 24 * 60;
- }
+ if (! pc.zones_seen)
+ goto fail;
else
{
- tm.tm_mday--;
- pc.time_zone -= 24 * 60;
+ /* Guard against falsely reporting errors near the time_t
+ boundaries when parsing times in other time zones. For
+ example, suppose the input string "1969-12-31 23:00:00 -0100",
+ the current time zone is 8 hours ahead of UTC, and the min
+ time_t value is 1970-01-01 00:00:00 UTC. Then the min
+ localtime value is 1970-01-01 08:00:00, and mktime will
+ therefore fail on 1969-12-31 23:00:00. To work around the
+ problem, set the time zone to 1 hour behind UTC temporarily
+ by setting TZ="XXX1:00" and try mktime again. */
+
+ long int time_zone = pc.time_zone;
+ long int abs_time_zone = time_zone < 0 ? - time_zone : time_zone;
+ long int abs_time_zone_hour = abs_time_zone / 60;
+ int abs_time_zone_min = abs_time_zone % 60;
+ char tz1buf[sizeof "XXX+0:00"
+ + sizeof pc.time_zone * CHAR_BIT / 3];
+ if (!tz_was_altered)
+ tz0 = get_tz (tz0buf);
+ sprintf (tz1buf, "XXX%s%ld:%02d", "-" + (time_zone < 0),
+ abs_time_zone_hour, abs_time_zone_min);
+ if (setenv ("TZ", tz1buf, 1) != 0)
+ goto fail;
+ tz_was_altered = true;
+ tm = tm0;
+ Start = mktime (&tm);
+ if (! mktime_ok (&tm0, &tm, Start))
+ goto fail;
}
- Start = mktime (&tm);
}
- if (Start == (time_t) -1)
- return false;
- }
-
- if (pc.days_seen && ! pc.dates_seen)
- {
- tm.tm_mday += ((pc.day_number - tm.tm_wday + 7) % 7
- + 7 * (pc.day_ordinal - (0 < pc.day_ordinal)));
- tm.tm_isdst = -1;
- Start = mktime (&tm);
- if (Start == (time_t) -1)
- return false;
- }
+ if (pc.days_seen && ! pc.dates_seen)
+ {
+ tm.tm_mday += ((pc.day_number - tm.tm_wday + 7) % 7
+ + 7 * (pc.day_ordinal - (0 < pc.day_ordinal)));
+ tm.tm_isdst = -1;
+ Start = mktime (&tm);
+ if (Start == (time_t) -1)
+ goto fail;
+ }
- if (pc.zones_seen)
- {
- long int delta = pc.time_zone * 60;
- time_t t1;
+ if (pc.zones_seen)
+ {
+ long int delta = pc.time_zone * 60;
+ time_t t1;
#ifdef HAVE_TM_GMTOFF
- delta -= tm.tm_gmtoff;
+ delta -= tm.tm_gmtoff;
#else
- time_t t = Start;
- struct tm const *gmt = gmtime (&t);
- if (! gmt)
- return false;
- delta -= tm_diff (&tm, gmt);
+ time_t t = Start;
+ struct tm const *gmt = gmtime (&t);
+ if (! gmt)
+ goto fail;
+ delta -= tm_diff (&tm, gmt);
#endif
- t1 = Start - delta;
- if ((Start < t1) != (delta < 0))
- return false; /* time_t overflow */
- Start = t1;
+ t1 = Start - delta;
+ if ((Start < t1) != (delta < 0))
+ goto fail; /* time_t overflow */
+ Start = t1;
+ }
+
+ /* Add relative date. */
+ if (pc.rel.year | pc.rel.month | pc.rel.day)
+ {
+ int year = tm.tm_year + pc.rel.year;
+ int month = tm.tm_mon + pc.rel.month;
+ int day = tm.tm_mday + pc.rel.day;
+ if (((year < tm.tm_year) ^ (pc.rel.year < 0))
+ | ((month < tm.tm_mon) ^ (pc.rel.month < 0))
+ | ((day < tm.tm_mday) ^ (pc.rel.day < 0)))
+ goto fail;
+ tm.tm_year = year;
+ tm.tm_mon = month;
+ tm.tm_mday = day;
+ tm.tm_hour = tm0.tm_hour;
+ tm.tm_min = tm0.tm_min;
+ tm.tm_sec = tm0.tm_sec;
+ tm.tm_isdst = tm0.tm_isdst;
+ Start = mktime (&tm);
+ if (Start == (time_t) -1)
+ goto fail;
+ }
+
+ /* Add relative hours, minutes, and seconds. On hosts that support
+ leap seconds, ignore the possibility of leap seconds; e.g.,
+ "+ 10 minutes" adds 600 seconds, even if one of them is a
+ leap second. Typically this is not what the user wants, but it's
+ too hard to do it the other way, because the time zone indicator
+ must be applied before relative times, and if mktime is applied
+ again the time zone will be lost. */
+ {
+ long int sum_ns = pc.seconds.tv_nsec + pc.rel.ns;
+ long int normalized_ns = (sum_ns % BILLION + BILLION) % BILLION;
+ time_t t0 = Start;
+ long int d1 = 60 * 60 * pc.rel.hour;
+ time_t t1 = t0 + d1;
+ long int d2 = 60 * pc.rel.minutes;
+ time_t t2 = t1 + d2;
+ long int d3 = pc.rel.seconds;
+ time_t t3 = t2 + d3;
+ long int d4 = (sum_ns - normalized_ns) / BILLION;
+ time_t t4 = t3 + d4;
+
+ if ((d1 / (60 * 60) ^ pc.rel.hour)
+ | (d2 / 60 ^ pc.rel.minutes)
+ | ((t1 < t0) ^ (d1 < 0))
+ | ((t2 < t1) ^ (d2 < 0))
+ | ((t3 < t2) ^ (d3 < 0))
+ | ((t4 < t3) ^ (d4 < 0)))
+ goto fail;
+
+ result->tv_sec = t4;
+ result->tv_nsec = normalized_ns;
+ }
}
- /* Add relative hours, minutes, and seconds. Ignore leap seconds;
- i.e. "+ 10 minutes" means 600 seconds, even if one of them is a
- leap second. Typically this is not what the user wants, but it's
- too hard to do it the other way, because the time zone indicator
- must be applied before relative times, and if mktime is applied
- again the time zone will be lost. */
- {
- long int sum_ns = pc.seconds.tv_nsec + pc.rel_ns;
- long int normalized_ns = (sum_ns % BILLION + BILLION) % BILLION;
- time_t t0 = Start;
- long int d1 = 60 * 60 * pc.rel_hour;
- time_t t1 = t0 + d1;
- long int d2 = 60 * pc.rel_minutes;
- time_t t2 = t1 + d2;
- long int d3 = pc.rel_seconds;
- time_t t3 = t2 + d3;
- long int d4 = (sum_ns - normalized_ns) / BILLION;
- time_t t4 = t3 + d4;
-
- if ((d1 / (60 * 60) ^ pc.rel_hour)
- | (d2 / 60 ^ pc.rel_minutes)
- | ((t1 < t0) ^ (d1 < 0))
- | ((t2 < t1) ^ (d2 < 0))
- | ((t3 < t2) ^ (d3 < 0))
- | ((t4 < t3) ^ (d4 < 0)))
- return false;
-
- result->tv_sec = t4;
- result->tv_nsec = normalized_ns;
- return true;
- }
+ goto done;
+
+ fail:
+ ok = false;
+ done:
+ if (tz_was_altered)
+ ok &= (tz0 ? setenv ("TZ", tz0, 1) : unsetenv ("TZ")) == 0;
+ if (tz0 != tz0buf)
+ free (tz0);
+ return ok;
}
#if TEST
-#include <stdio.h>
-
int
main (int ac, char **av)
{
projects / gnulib.git / blobdiff