X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fgetdate.y;h=1deec5160de23f166e0e569778e8824cc4e56d4a;hb=95454b6b2dbb9f57bf5623a0fd8d40fb2433c4d7;hp=d874d689ef0d854e74df2279e399092de95e206d;hpb=a8f0811e1e174cd6d3b5f0fef314269d000f9c4c;p=gnulib.git
diff --git a/lib/getdate.y b/lib/getdate.y
index d874d689e..1deec5160 100644
--- a/lib/getdate.y
+++ b/lib/getdate.y
@@ -1,13 +1,13 @@
%{
/* Parse a string into an internal time stamp.
- Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2006 Free Software
+ 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
+ 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 2, or (at your option)
- any later version.
+ 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
@@ -15,8 +15,7 @@
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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see . */
/* Originally written by Steven M. Bellovin while
at the University of North Carolina at Chapel Hill. Later tweaked by
@@ -32,12 +31,14 @@
/* FIXME: Check for arithmetic overflow in all cases, not just
some of them. */
-#ifdef HAVE_CONFIG_H
-# include
-#endif
+#include
#include "getdate.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
@@ -65,7 +66,6 @@
#include
#include
-#include "setenv.h"
#include "xalloc.h"
@@ -108,6 +108,13 @@
#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
@@ -197,9 +204,48 @@ typedef struct
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);
+/* Extract into *PC any date and time info from a string of digits
+ of the form e.g., YYYYMMDD, YYMMDD, HHMM, HH (and sometimes YYY,
+ YYYY, ...). */
+static void
+digits_to_date_time (parser_control *pc, textint text_int)
+{
+ if (pc->dates_seen && ! pc->year.digits
+ && ! pc->rels_seen && (pc->times_seen || 2 < text_int.digits))
+ pc->year = text_int;
+ else
+ {
+ if (4 < text_int.digits)
+ {
+ pc->dates_seen++;
+ pc->day = text_int.value % 100;
+ pc->month = (text_int.value / 100) % 100;
+ pc->year.value = text_int.value / 10000;
+ pc->year.digits = text_int.digits - 4;
+ }
+ else
+ {
+ pc->times_seen++;
+ if (text_int.digits <= 2)
+ {
+ pc->hour = text_int.value;
+ pc->minutes = 0;
+ }
+ else
+ {
+ pc->hour = text_int.value / 100;
+ pc->minutes = text_int.value % 100;
+ }
+ pc->seconds.tv_sec = 0;
+ pc->seconds.tv_nsec = 0;
+ pc->meridian = MER24;
+ }
+ }
+}
+
%}
/* We want a reentrant parser, even if the TZ manipulation and the calls to
@@ -269,6 +315,7 @@ item:
| rel
{ pc->rels_seen = true; }
| number
+ | hybrid
;
time:
@@ -544,38 +591,23 @@ unsigned_seconds:
number:
tUNUMBER
+ { digits_to_date_time (pc, $1); }
+ ;
+
+hybrid:
+ tUNUMBER relunit_snumber
{
- if (pc->dates_seen && ! pc->year.digits
- && ! pc->rels_seen && (pc->times_seen || 2 < $1.digits))
- pc->year = $1;
- else
- {
- if (4 < $1.digits)
- {
- pc->dates_seen++;
- pc->day = $1.value % 100;
- pc->month = ($1.value / 100) % 100;
- pc->year.value = $1.value / 10000;
- pc->year.digits = $1.digits - 4;
- }
- else
- {
- pc->times_seen++;
- if ($1.digits <= 2)
- {
- pc->hour = $1.value;
- pc->minutes = 0;
- }
- else
- {
- pc->hour = $1.value / 100;
- pc->minutes = $1.value % 100;
- }
- pc->seconds.tv_sec = 0;
- pc->seconds.tv_nsec = 0;
- pc->meridian = MER24;
- }
- }
+ /* Hybrid all-digit and relative offset, so that we accept e.g.,
+ "YYYYMMDD +N days" as well as "YYYYMMDD N days". */
+ digits_to_date_time (pc, $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;
}
;
@@ -1108,7 +1140,8 @@ yylex (YYSTYPE *lvalp, parser_control *pc)
/* 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;
}
@@ -1229,6 +1262,12 @@ get_date (struct timespec *result, char const *p, struct timespec const *now)
}
}
+ /* As documented, be careful to treat the empty string just like
+ a date string of "0". Without this, an empty string would be
+ declared invalid when parsed during a DST transition. */
+ if (*p == '\0')
+ p = "0";
+
pc.input = p;
pc.year.value = tmp->tm_year;
pc.year.value += TM_YEAR_BASE;
@@ -1282,7 +1321,7 @@ get_date (struct timespec *result, char const *p, struct timespec const *now)
#else
#if HAVE_TZNAME
{
-# ifndef tzname
+# if !HAVE_DECL_TZNAME
extern char *tzname[];
# endif
int i;