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authorKevin B Kenny <kennykb@acm.org>2004-05-18 21:52:56 (GMT)
committerKevin B Kenny <kennykb@acm.org>2004-05-18 21:52:56 (GMT)
commit9952f1458ffdf3f22b1013dab019fb273dff357f (patch)
tree68fc172017b9d4cf65f0d772cfaada0f085f643c /compat/strftime.c
parent796e34e6aaf5f3b99f1c0e9d7906567eeb2ad087 (diff)
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* compat/strftime.c (_fmt, ISO8601Week):
* doc/clock.n: * tests/clock.test: Major rework to the handling of ISO8601 week numbers. Now passes all the %G and %V test cases on Windows, Linux and Solaris [Bugs #500285, #500389, and #852944]
Diffstat (limited to 'compat/strftime.c')
-rw-r--r--compat/strftime.c98
1 files changed, 77 insertions, 21 deletions
diff --git a/compat/strftime.c b/compat/strftime.c
index 027e373..dbd7d54 100644
--- a/compat/strftime.c
+++ b/compat/strftime.c
@@ -10,7 +10,7 @@
*
* Changes 2002 Copyright (c) 2002 ActiveState Corporation.
*
- * RCS: @(#) $Id: strftime.c,v 1.10 2002/05/29 00:19:39 hobbs Exp $
+ * RCS: @(#) $Id: strftime.c,v 1.10.2.1 2004/05/18 21:52:56 kennykb Exp $
*/
/*
@@ -47,7 +47,7 @@
*/
#if defined(LIBC_SCCS)
-static char *rcsid = "$Id: strftime.c,v 1.10 2002/05/29 00:19:39 hobbs Exp $";
+static char *rcsid = "$Id: strftime.c,v 1.10.2.1 2004/05/18 21:52:56 kennykb Exp $";
#endif /* LIBC_SCCS */
#include <time.h>
@@ -113,6 +113,7 @@ static int _conv _ANSI_ARGS_((int n, int digits, int pad));
static int _secs _ANSI_ARGS_((const struct tm *t));
static size_t _fmt _ANSI_ARGS_((const char *format,
const struct tm *t));
+static int ISO8601Week _ANSI_ARGS_((CONST struct tm* t, int *year ));
size_t
TclpStrftime(s, maxsize, format, t, useGMT)
@@ -229,6 +230,24 @@ _fmt(format, t)
if (!_conv(t->tm_mday, 2, ' '))
return(0);
continue;
+ case 'g':
+ {
+ int year;
+ ISO8601Week( t, &year );
+ if ( !_conv( year%100, 2, '0' ) ) {
+ return( 0 );
+ }
+ continue;
+ }
+ case 'G':
+ {
+ int year;
+ ISO8601Week( t, &year );
+ if ( !_conv( year, 4, '0' ) ) {
+ return( 0 );
+ }
+ continue;
+ }
case 'H':
if (!_conv(t->tm_hour, 2, '0'))
return(0);
@@ -301,25 +320,7 @@ _fmt(format, t)
continue;
case 'V':
{
- /* ISO 8601 Week Of Year:
- If the week (Monday - Sunday) containing
- January 1 has four or more days in the new
- year, then it is week 1; otherwise it is
- week 53 of the previous year and the next
- week is week one. */
-
- int week = MON_WEEK(t);
-
- int days = (((t)->tm_yday + 7 - \
- ((t)->tm_wday ? (t)->tm_wday - 1 : 6)) % 7);
-
-
- if (days >= 4) {
- week++;
- } else if (week == 0) {
- week = 53;
- }
-
+ int week = ISO8601Week( t, NULL );
if (!_conv(week, 2, '0'))
return(0);
continue;
@@ -449,3 +450,58 @@ _add(str)
return(1);
}
}
+
+static int
+ISO8601Week( t, year )
+ CONST struct tm* t;
+ int* year;
+{
+ /* Find the day-of-year of the Thursday in
+ * the week in question. */
+
+ int ydayThursday;
+ int week;
+ if ( t->tm_wday == 0 ) {
+ ydayThursday = t->tm_yday - 3;
+ } else {
+ ydayThursday = t->tm_yday - t->tm_wday + 4;
+ }
+
+ if ( ydayThursday < 0 ) {
+
+ /* This is the last week of the previous year. */
+ if ( IsLeapYear(( t->tm_year + TM_YEAR_BASE - 1 )) ) {
+ ydayThursday += 366;
+ } else {
+ ydayThursday += 365;
+ }
+ week = ydayThursday / 7 + 1;
+ if ( year != NULL ) {
+ *year = t->tm_year + 1899;
+ }
+
+ } else if ( ( IsLeapYear(( t -> tm_year + TM_YEAR_BASE ))
+ && ydayThursday >= 366 )
+ || ( !IsLeapYear(( t -> tm_year
+ + TM_YEAR_BASE ))
+ && ydayThursday >= 365 ) ) {
+
+ /* This is week 1 of the following year */
+
+ week = 1;
+ if ( year != NULL ) {
+ *year = t->tm_year + 1901;
+ }
+
+ } else {
+
+ week = ydayThursday / 7 + 1;
+ if ( year != NULL ) {
+ *year = t->tm_year + 1900;
+ }
+
+ }
+
+ return week;
+
+}