%{
/* 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
/* FIXME: Check for arithmetic overflow in all cases, not just
some of them. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "getdate.h"
-#include <alloca.h>
+#include "intprops.h"
+#include "timespec.h"
+#include "verify.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 "setenv.h"
#include "xalloc.h"
-#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
-# define IN_CTYPE_DOMAIN(c) 1
-#else
-# define IN_CTYPE_DOMAIN(c) isascii (c)
-#endif
-
-#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))
/* ISDIGIT differs from isdigit, 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.
+ - 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 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)
-#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 HOUR(x) ((x) * 60)
+/* Lots of this code assumes time_t and time_t-like values fit into
+ long int. It also assumes that signed integer overflow silently
+ wraps around, but there's no portable way to check for that at
+ compile-time. */
+verify (TYPE_IS_INTEGER (time_t));
+verify (LONG_MIN <= TYPE_MINIMUM (time_t) && TYPE_MAXIMUM (time_t) <= LONG_MAX);
+
/* An integer value, and the number of digits in its textual
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);
%}
%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 tORDINAL
-%token <intval> 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
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:
tORDINAL tYEAR_UNIT
- { pc->rel_year += $1 * $2; }
+ { $$ = RELATIVE_TIME_0; $$.year = $1; }
| tUNUMBER tYEAR_UNIT
- { pc->rel_year += $1.value * $2; }
- | tSNUMBER tYEAR_UNIT
- { pc->rel_year += $1.value * $2; }
+ { $$ = RELATIVE_TIME_0; $$.year = $1.value; }
| tYEAR_UNIT
- { pc->rel_year += $1; }
+ { $$ = RELATIVE_TIME_0; $$.year = 1; }
| tORDINAL tMONTH_UNIT
- { pc->rel_month += $1 * $2; }
+ { $$ = RELATIVE_TIME_0; $$.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
- { pc->rel_day += $1 * $2; }
+ { $$ = RELATIVE_TIME_0; $$.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
- { pc->rel_hour += $1 * $2; }
+ { $$ = RELATIVE_TIME_0; $$.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
- { pc->rel_minutes += $1 * $2; }
+ { $$ = RELATIVE_TIME_0; $$.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
- { pc->rel_seconds += $1 * $2; }
+ { $$ = RELATIVE_TIME_0; $$.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; }
{ 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;
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 (! now)
{
- if (gettime (&gettime_buffer) != 0)
- return false;
+ gettime (&gettime_buffer);
now = &gettime_buffer;
}
if (! tmp)
return false;
- while (c = *p, ISSPACE (c))
+ while (c = *p, isspace (c))
p++;
if (strncmp (p, "TZ=\"", 4) == 0)
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
*result = pc.seconds;
else
{
- 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))
+ 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;
}
/* Add relative date. */
- if (pc.rel_year | pc.rel_month | pc.rel_day)
+ 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)))
+ 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;
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 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;
+ long int d1 = 60 * 60 * pc.rel.hour;
time_t t1 = t0 + d1;
- long int d2 = 60 * pc.rel_minutes;
+ long int d2 = 60 * pc.rel.minutes;
time_t t2 = t1 + d2;
- long int d3 = pc.rel_seconds;
+ 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)
+ if ((d1 / (60 * 60) ^ pc.rel.hour)
+ | (d2 / 60 ^ pc.rel.minutes)
| ((t1 < t0) ^ (d1 < 0))
| ((t2 < t1) ^ (d2 < 0))
| ((t3 < t2) ^ (d3 < 0))
projects / gnulib.git / blobdiff