[libxslt] Fix a problem with ESXLT date:add() with January

[Daniel Veillard <veillard src gnome org>]

commit 4e9909066731067d8e256ca25d8d54944105bc5e
Author: money_seshu Dronamraju <mcseshu gmail com>
Date:   Mon Mar 7 12:12:11 2011 +0800

    Fix a problem with ESXLT date:add() with January
    
    Also adds a regression test provided by Michael Ludwig <milu71 gmx de>

 libexslt/date.c            |    2 +-
 tests/docs/date_add.xml    |    1 +
 tests/general/Makefile.am  |    2 +-
 tests/general/date_add.out |    9 +++++++++
 tests/general/date_add.xsl |   16 ++++++++++++++++
 5 files changed, 28 insertions(+), 2 deletions(-)
---
diff --git a/libexslt/date.c b/libexslt/date.c
index cefbdd8..05b11ed 100644
--- a/libexslt/date.c
+++ b/libexslt/date.c
@@ -1577,7 +1577,7 @@ _exsltDateAdd (exsltDateValPtr dt, exsltDateValPtr dur)
         if ((r->hour) || (r->min) || (r->sec))
             ret->type = XS_DATETIME;
         else if (ret->type != XS_DATE) {
-            if ((r->mon != 1) && (r->day != 1))
+            if (r->day != 1)
                 ret->type = XS_DATE;
             else if ((ret->type != XS_GYEARMONTH) && (r->mon != 1))
                 ret->type = XS_GYEARMONTH;
diff --git a/tests/docs/date_add.xml b/tests/docs/date_add.xml
new file mode 100644
index 0000000..69d62f2
--- /dev/null
+++ b/tests/docs/date_add.xml
@@ -0,0 +1 @@
+<doc/>
diff --git a/tests/general/Makefile.am b/tests/general/Makefile.am
index 7207e15..8f32fe7 100644
--- a/tests/general/Makefile.am
+++ b/tests/general/Makefile.am
@@ -182,7 +182,7 @@ EXTRA_DIST = \
     character.out character.xsl \
     character2.out character2.xsl \
     itemschoose.out itemschoose.xsl \
-    inner.xsl
+    inner.xsl date_add.xsl
 
 
 all:
diff --git a/tests/general/date_add.out b/tests/general/date_add.out
new file mode 100644
index 0000000..fbca16b
--- /dev/null
+++ b/tests/general/date_add.out
@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<dates-and-times>
+  <d>2001-01-04</d>
+  <d>2001-02-04</d>
+  <d>2001-12-04</d>
+  <d>2001-12-31</d>
+  <d>2002-01</d>
+  <d>2002-01-02</d>
+</dates-and-times>
diff --git a/tests/general/date_add.xsl b/tests/general/date_add.xsl
new file mode 100644
index 0000000..0ef39c5
--- /dev/null
+++ b/tests/general/date_add.xsl
@@ -0,0 +1,16 @@
+<xsl:stylesheet version="1.0"
+  xmlns:date="http://exslt.org/dates-and-times";
+  exclude-result-prefixes="date"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
+  <xsl:output indent="yes"/>
+  <xsl:template match="/">
+    <dates-and-times>
+      <d><xsl:value-of select="date:add( '2001-01', 'P3D' )" /></d>
+      <d><xsl:value-of select="date:add( '2001-02', 'P3D' )" /></d>
+      <d><xsl:value-of select="date:add( '2001-12', 'P3D' )" /></d>
+      <d><xsl:value-of select="date:add( '2001-12', 'P30D' )" /></d>
+      <d><xsl:value-of select="date:add( '2001-12', 'P31D' )" /></d>
+      <d><xsl:value-of select="date:add( '2001-12', 'P32D' )" /></d>
+    </dates-and-times>
+  </xsl:template>
+</xsl:stylesheet>