xpath: Fix build without LIBXML_XPATH_ENABLED

Move static function declaration into XPATH block. Also move comparison
functions.

Fixes #537.

xpath.c

@@ -145,6 +145,114 @@
  * any use of the macros IS_ASCII_CHARACTER and IS_ASCII_DIGIT)
  */
 
+#if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
+
+/************************************************************************
+ *									*
+ *			Floating point stuff				*
+ *									*
+ ************************************************************************/
+
+double xmlXPathNAN = 0.0;
+double xmlXPathPINF = 0.0;
+double xmlXPathNINF = 0.0;
+
+/**
+ * xmlXPathInit:
+ *
+ * DEPRECATED: Alias for xmlInitParser.
+ */
+void
+xmlXPathInit(void) {
+    xmlInitParser();
+}
+
+/**
+ * xmlInitXPathInternal:
+ *
+ * Initialize the XPath environment
+ */
+ATTRIBUTE_NO_SANITIZE("float-divide-by-zero")
+void
+xmlInitXPathInternal(void) {
+#if defined(NAN) && defined(INFINITY)
+    xmlXPathNAN = NAN;
+    xmlXPathPINF = INFINITY;
+    xmlXPathNINF = -INFINITY;
+#else
+    /* MSVC doesn't allow division by zero in constant expressions. */
+    double zero = 0.0;
+    xmlXPathNAN = 0.0 / zero;
+    xmlXPathPINF = 1.0 / zero;
+    xmlXPathNINF = -xmlXPathPINF;
+#endif
+}
+
+/**
+ * xmlXPathIsNaN:
+ * @val:  a double value
+ *
+ * Returns 1 if the value is a NaN, 0 otherwise
+ */
+int
+xmlXPathIsNaN(double val) {
+#ifdef isnan
+    return isnan(val);
+#else
+    return !(val == val);
+#endif
+}
+
+/**
+ * xmlXPathIsInf:
+ * @val:  a double value
+ *
+ * Returns 1 if the value is +Infinite, -1 if -Infinite, 0 otherwise
+ */
+int
+xmlXPathIsInf(double val) {
+#ifdef isinf
+    return isinf(val) ? (val > 0 ? 1 : -1) : 0;
+#else
+    if (val >= xmlXPathPINF)
+        return 1;
+    if (val <= -xmlXPathPINF)
+        return -1;
+    return 0;
+#endif
+}
+
+#endif /* SCHEMAS or XPATH */
+
+#ifdef LIBXML_XPATH_ENABLED
+
+/*
+ * TODO: when compatibility allows remove all "fake node libxslt" strings
+ *       the test should just be name[0] = ' '
+ */
+#ifdef DEBUG_XPATH_EXPRESSION
+#define DEBUG_STEP
+#define DEBUG_EXPR
+#define DEBUG_EVAL_COUNTS
+#endif
+
+static xmlNs xmlXPathXMLNamespaceStruct = {
+    NULL,
+    XML_NAMESPACE_DECL,
+    XML_XML_NAMESPACE,
+    BAD_CAST "xml",
+    NULL,
+    NULL
+};
+static xmlNsPtr xmlXPathXMLNamespace = &xmlXPathXMLNamespaceStruct;
+#ifndef LIBXML_THREAD_ENABLED
+/*
+ * Optimizer is disabled only when threaded apps are detected while
+ * the library ain't compiled for thread safety.
+ */
+static int xmlXPathDisableOptimizer = 0;
+#endif
+
 static void
 xmlXPathNodeSetClear(xmlNodeSetPtr set, int hasNsNodes);
 
@@ -475,114 +583,6 @@ int wrap_cmp( xmlNodePtr x, xmlNodePtr y );
 #include "timsort.h"
 #endif /* WITH_TIM_SORT */
 
-#if defined(LIBXML_XPATH_ENABLED) || defined(LIBXML_SCHEMAS_ENABLED)
-
-/************************************************************************
- *									*
- *			Floating point stuff				*
- *									*
- ************************************************************************/
-
-double xmlXPathNAN = 0.0;
-double xmlXPathPINF = 0.0;
-double xmlXPathNINF = 0.0;
-
-/**
- * xmlXPathInit:
- *
- * DEPRECATED: Alias for xmlInitParser.
- */
-void
-xmlXPathInit(void) {
-    xmlInitParser();
-}
-
-/**
- * xmlInitXPathInternal:
- *
- * Initialize the XPath environment
- */
-ATTRIBUTE_NO_SANITIZE("float-divide-by-zero")
-void
-xmlInitXPathInternal(void) {
-#if defined(NAN) && defined(INFINITY)
-    xmlXPathNAN = NAN;
-    xmlXPathPINF = INFINITY;
-    xmlXPathNINF = -INFINITY;
-#else
-    /* MSVC doesn't allow division by zero in constant expressions. */
-    double zero = 0.0;
-    xmlXPathNAN = 0.0 / zero;
-    xmlXPathPINF = 1.0 / zero;
-    xmlXPathNINF = -xmlXPathPINF;
-#endif
-}
-
-/**
- * xmlXPathIsNaN:
- * @val:  a double value
- *
- * Returns 1 if the value is a NaN, 0 otherwise
- */
-int
-xmlXPathIsNaN(double val) {
-#ifdef isnan
-    return isnan(val);
-#else
-    return !(val == val);
-#endif
-}
-
-/**
- * xmlXPathIsInf:
- * @val:  a double value
- *
- * Returns 1 if the value is +Infinite, -1 if -Infinite, 0 otherwise
- */
-int
-xmlXPathIsInf(double val) {
-#ifdef isinf
-    return isinf(val) ? (val > 0 ? 1 : -1) : 0;
-#else
-    if (val >= xmlXPathPINF)
-        return 1;
-    if (val <= -xmlXPathPINF)
-        return -1;
-    return 0;
-#endif
-}
-
-#endif /* SCHEMAS or XPATH */
-
-#ifdef LIBXML_XPATH_ENABLED
-
-/*
- * TODO: when compatibility allows remove all "fake node libxslt" strings
- *       the test should just be name[0] = ' '
- */
-#ifdef DEBUG_XPATH_EXPRESSION
-#define DEBUG_STEP
-#define DEBUG_EXPR
-#define DEBUG_EVAL_COUNTS
-#endif
-
-static xmlNs xmlXPathXMLNamespaceStruct = {
-    NULL,
-    XML_NAMESPACE_DECL,
-    XML_XML_NAMESPACE,
-    BAD_CAST "xml",
-    NULL,
-    NULL
-};
-static xmlNsPtr xmlXPathXMLNamespace = &xmlXPathXMLNamespaceStruct;
-#ifndef LIBXML_THREAD_ENABLED
-/*
- * Optimizer is disabled only when threaded apps are detected while
- * the library ain't compiled for thread safety.
- */
-static int xmlXPathDisableOptimizer = 0;
-#endif
-
 /************************************************************************
  *									*
  *			Error handling routines				*