gh-138998: Upgrade vendored expat to 2.7.2 (GH-138999)

(cherry picked from commit 64c876d)

Co-authored-by: Stan Ulbrych <[email protected]>

Author: StanFromIreland

Misc/NEWS.d/next/Library/2025-09-16-19-05-29.gh-issue-138998.URl0Y_.rst

@@ -0,0 +1 @@
+Update bundled libexpat to 2.7.2

Misc/sbom.spdx.json

@@ -42,21 +42,21 @@
 */
 
 #ifndef Expat_INCLUDED
-#define Expat_INCLUDED 1
+#  define Expat_INCLUDED 1
 
-#include <stdlib.h>
-#include "expat_external.h"
+#  include <stdlib.h>
+#  include "expat_external.h"
 
-#ifdef __cplusplus
+#  ifdef __cplusplus
 extern "C" {
-#endif
+#  endif
 
 struct XML_ParserStruct;
 typedef struct XML_ParserStruct *XML_Parser;
 
 typedef unsigned char XML_Bool;
-#define XML_TRUE ((XML_Bool)1)
-#define XML_FALSE ((XML_Bool)0)
+#  define XML_TRUE ((XML_Bool)1)
+#  define XML_FALSE ((XML_Bool)0)
 
 /* The XML_Status enum gives the possible return values for several
    API functions.  The preprocessor #defines are included so this
@@ -73,11 +73,11 @@ typedef unsigned char XML_Bool;
 */
 enum XML_Status {
   XML_STATUS_ERROR = 0,
-#define XML_STATUS_ERROR XML_STATUS_ERROR
+#  define XML_STATUS_ERROR XML_STATUS_ERROR
   XML_STATUS_OK = 1,
-#define XML_STATUS_OK XML_STATUS_OK
+#  define XML_STATUS_OK XML_STATUS_OK
   XML_STATUS_SUSPENDED = 2
-#define XML_STATUS_SUSPENDED XML_STATUS_SUSPENDED
+#  define XML_STATUS_SUSPENDED XML_STATUS_SUSPENDED
 };
 
 enum XML_Error {
@@ -680,7 +680,7 @@ XMLPARSEAPI(void)
 XML_SetUserData(XML_Parser parser, void *userData);
 
 /* Returns the last value set by XML_SetUserData or NULL. */
-#define XML_GetUserData(parser) (*(void **)(parser))
+#  define XML_GetUserData(parser) (*(void **)(parser))
 
 /* This is equivalent to supplying an encoding argument to
    XML_ParserCreate. On success XML_SetEncoding returns non-zero,
@@ -752,7 +752,7 @@ XML_GetSpecifiedAttributeCount(XML_Parser parser);
 XMLPARSEAPI(int)
 XML_GetIdAttributeIndex(XML_Parser parser);
 
-#ifdef XML_ATTR_INFO
+#  ifdef XML_ATTR_INFO
 /* Source file byte offsets for the start and end of attribute names and values.
    The value indices are exclusive of surrounding quotes; thus in a UTF-8 source
    file an attribute value of "blah" will yield:
@@ -773,7 +773,7 @@ typedef struct {
 */
 XMLPARSEAPI(const XML_AttrInfo *)
 XML_GetAttributeInfo(XML_Parser parser);
-#endif
+#  endif
 
 /* Parses some input. Returns XML_STATUS_ERROR if a fatal error is
    detected.  The last call to XML_Parse must have isFinal true; len
@@ -970,9 +970,9 @@ XMLPARSEAPI(const char *)
 XML_GetInputContext(XML_Parser parser, int *offset, int *size);
 
 /* For backwards compatibility with previous versions. */
-#define XML_GetErrorLineNumber XML_GetCurrentLineNumber
-#define XML_GetErrorColumnNumber XML_GetCurrentColumnNumber
-#define XML_GetErrorByteIndex XML_GetCurrentByteIndex
+#  define XML_GetErrorLineNumber XML_GetCurrentLineNumber
+#  define XML_GetErrorColumnNumber XML_GetCurrentColumnNumber
+#  define XML_GetErrorByteIndex XML_GetCurrentByteIndex
 
 /* Frees the content model passed to the element declaration handler */
 XMLPARSEAPI(void)
@@ -1032,7 +1032,10 @@ enum XML_FeatureEnum {
   XML_FEATURE_BILLION_LAUGHS_ATTACK_PROTECTION_MAXIMUM_AMPLIFICATION_DEFAULT,
   XML_FEATURE_BILLION_LAUGHS_ATTACK_PROTECTION_ACTIVATION_THRESHOLD_DEFAULT,
   /* Added in Expat 2.6.0. */
-  XML_FEATURE_GE
+  XML_FEATURE_GE,
+  /* Added in Expat 2.7.2. */
+  XML_FEATURE_ALLOC_TRACKER_MAXIMUM_AMPLIFICATION_DEFAULT,
+  XML_FEATURE_ALLOC_TRACKER_ACTIVATION_THRESHOLD_DEFAULT,
   /* Additional features must be added to the end of this enum. */
 };
 
@@ -1045,7 +1048,7 @@ typedef struct {
 XMLPARSEAPI(const XML_Feature *)
 XML_GetFeatureList(void);
 
-#if defined(XML_DTD) || (defined(XML_GE) && XML_GE == 1)
+#  if defined(XML_DTD) || (defined(XML_GE) && XML_GE == 1)
 /* Added in Expat 2.4.0 for XML_DTD defined and
  * added in Expat 2.6.0 for XML_GE == 1. */
 XMLPARSEAPI(XML_Bool)
@@ -1057,7 +1060,17 @@ XML_SetBillionLaughsAttackProtectionMaximumAmplification(
 XMLPARSEAPI(XML_Bool)
 XML_SetBillionLaughsAttackProtectionActivationThreshold(
     XML_Parser parser, unsigned long long activationThresholdBytes);
-#endif
+
+/* Added in Expat 2.7.2. */
+XMLPARSEAPI(XML_Bool)
+XML_SetAllocTrackerMaximumAmplification(XML_Parser parser,
+                                        float maximumAmplificationFactor);
+
+/* Added in Expat 2.7.2. */
+XMLPARSEAPI(XML_Bool)
+XML_SetAllocTrackerActivationThreshold(
+    XML_Parser parser, unsigned long long activationThresholdBytes);
+#  endif
 
 /* Added in Expat 2.6.0. */
 XMLPARSEAPI(XML_Bool)
@@ -1066,12 +1079,12 @@ XML_SetReparseDeferralEnabled(XML_Parser parser, XML_Bool enabled);
 /* Expat follows the semantic versioning convention.
    See https://semver.org
 */
-#define XML_MAJOR_VERSION 2
-#define XML_MINOR_VERSION 7
-#define XML_MICRO_VERSION 1
+#  define XML_MAJOR_VERSION 2
+#  define XML_MINOR_VERSION 7
+#  define XML_MICRO_VERSION 2
 
-#ifdef __cplusplus
+#  ifdef __cplusplus
 }
-#endif
+#  endif
 
 #endif /* not Expat_INCLUDED */