From c7064c18b9fecfb02c605e32448a81d8d8dbe173 Mon Sep 17 00:00:00 2001
From: deepend-tildeclub <deepend@tilde.club>
Date: Wed, 20 May 2026 14:51:06 -0600
Subject: [PATCH] Clamp spell-provider length casts on Win32

---
 src/libenchant_win8/win8_provider.cpp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/libenchant_win8/win8_provider.cpp b/src/libenchant_win8/win8_provider.cpp
index 1a95edc4..9d017a9c 100644
--- a/src/libenchant_win8/win8_provider.cpp
+++ b/src/libenchant_win8/win8_provider.cpp
@@ -26,12 +26,19 @@
 #include <windows.h>
 
 #include <cstdlib>
+#include <climits>
 
 #include "typedef.h" // for ssize_t
 #include <enchant-provider.h>
 
 ENCHANT_PLUGIN_DECLARE ("win8")
 
+static int
+size_to_int (size_t value)
+{
+	return value > static_cast<size_t>(INT_MAX) ? INT_MAX : static_cast<int>(value);
+}
+
 static char *
 utf16_to_utf8 (const wchar_t * const str, bool from_bcp47)
 {
@@ -136,7 +143,7 @@ static void
 win8_dict_add_to_personal (EnchantDict *dict, const char *const word, size_t len)
 {
 	auto checker = static_cast<ISpellChecker*>(dict->user_data);
-	wchar_t *wword = utf8_to_utf16 (word, static_cast<int>(len), false);
+	wchar_t *wword = utf8_to_utf16 (word, size_to_int (len), false);
 
 	checker->Add (wword);
 	std::free (wword);
@@ -146,7 +153,7 @@ static void
 win8_dict_add_to_session (EnchantDict *dict, const char *const word, size_t len)
 {
 	auto checker = static_cast<ISpellChecker*>(dict->user_data);
-	wchar_t *wword = utf8_to_utf16 (word, static_cast<int>(len), false);
+	wchar_t *wword = utf8_to_utf16 (word, size_to_int (len), false);
 
 	checker->Ignore (wword);
 	std::free (wword);
@@ -156,7 +163,7 @@ static int
 win8_dict_check (EnchantDict *dict, const char *const word, size_t len)
 {
 	auto checker = static_cast<ISpellChecker*>(dict->user_data);
-	wchar_t *wword = utf8_to_utf16 (word, static_cast<int>(len), false);
+	wchar_t *wword = utf8_to_utf16 (word, size_to_int (len), false);
 	IEnumSpellingError *errors;
 	ISpellingError *error = nullptr;
 	HRESULT hr;
@@ -184,7 +191,7 @@ static char **
 win8_dict_suggest (EnchantDict *dict, const char *const word, size_t len, size_t *out_n_suggs)
 {
 	auto checker = static_cast<ISpellChecker*>(dict->user_data);
-	wchar_t *wword = utf8_to_utf16 (word, static_cast<int>(len), false);
+	wchar_t *wword = utf8_to_utf16 (word, size_to_int (len), false);
 	IEnumString *suggestions;
 	HRESULT hr;