From 608c65bb8ebfc12763aee1cc1f3778e17d71596e Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Wed, 18 Jan 2023 15:15:41 +0100
Subject: [PATCH] xpath: number('-') should return NaN

Fixes https://gitlab.gnome.org/GNOME/libxslt/-/issues/81

Reference:https://github.com/GNOME/libxml2/commit/608c65bb8ebfc12763aee1cc1f3778e17d71596e
Conflict:NA
---
 result/XPath/expr/functions | 4 ++++
 test/XPath/expr/functions   | 1 +
 xpath.c                     | 6 +++---
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/result/XPath/expr/functions b/result/XPath/expr/functions
index e09eb4a..4ff9c58 100644
--- a/result/XPath/expr/functions
+++ b/result/XPath/expr/functions
@@ -19,6 +19,10 @@ Object is a number : NaN
 Expression: -number('abc')
 Object is a number : NaN
 
+========================
+Expression: number('-')
+Object is a number : NaN
+
 ========================
 Expression: floor(0.1)
 Object is a number : 0
diff --git a/test/XPath/expr/functions b/test/XPath/expr/functions
index 00b9461..6008a07 100644
--- a/test/XPath/expr/functions
+++ b/test/XPath/expr/functions
@@ -3,6 +3,7 @@ false()
 number("1.5")
 number('abc')
 -number('abc')
+number('-')
 floor(0.1)
 floor(-0.1)
 floor(-0)
diff --git a/xpath.c b/xpath.c
index 85d7919..fbec21b 100644
--- a/xpath.c
+++ b/xpath.c
@@ -9987,13 +9987,13 @@ xmlXPathStringEvalNumber(const xmlChar *str) {
 #endif
     if (cur == NULL) return(0);
     while (IS_BLANK_CH(*cur)) cur++;
-    if ((*cur != '.') && ((*cur < '0') || (*cur > '9')) && (*cur != '-')) {
-        return(xmlXPathNAN);
-    }
     if (*cur == '-') {
 	isneg = 1;
 	cur++;
     }
+    if ((*cur != '.') && ((*cur < '0') || (*cur > '9'))) {
+        return(xmlXPathNAN);
+    }
 
 #ifdef __GNUC__
     /*
-- 
2.27.0