From efd91b90c2d974ea098412f08ddc3aa93eeb2d05 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Sat, 14 Feb 2026 22:00:21 -0500
Subject: [PATCH] =?UTF-8?q?standards=E2=80=91compliant=20thread=20id=20str?=
 =?UTF-8?q?ing?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 MagickCore/thread-private.h | 24 ++++++++++++++++++++++++
 coders/coders-private.h     |  7 -------
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/MagickCore/thread-private.h b/MagickCore/thread-private.h
index bccc689d56..7ca31b69c5 100644
--- a/MagickCore/thread-private.h
+++ b/MagickCore/thread-private.h
@@ -85,6 +85,30 @@ static inline MagickThreadType GetMagickThreadId(void)
 #endif
 }
 
+static inline void DecorateFilenameWithThreadId(const char *filename,
+  char *thread_filename)
+{
+  MagickThreadType
+    id;
+
+  char
+    thread_id[2*sizeof(id)+1];
+
+  ssize_t
+    i;
+
+  unsigned char
+    bytes[sizeof(id)];
+
+  id=GetMagickThreadId();
+  (void) memcpy(bytes,&id,sizeof(id));
+  for (i=0; i < (ssize_t) sizeof(bytes); i++)
+    (void) sprintf(thread_id+2*i,"%02x",bytes[i]);
+  thread_id[sizeof(thread_id)-1]='\0';
+  (void) FormatLocaleString(thread_filename,MagickPathExtent,"%s|%s",thread_id,
+    filename);
+}
+
 static inline size_t GetMagickThreadSignature(void)
 {
 #if defined(MAGICKCORE_THREAD_SUPPORT)
diff --git a/coders/coders-private.h b/coders/coders-private.h
index f4639b49ba..4c220e6a89 100644
--- a/coders/coders-private.h
+++ b/coders/coders-private.h
@@ -36,13 +36,6 @@ extern ModuleExport size_t \
 extern ModuleExport void \
   Unregister ## coder ## Image(void);
 
-static inline void DecorateFilenameWithThreadId(const char *filename,
-  char *thread_filename)
-{
-  (void) FormatLocaleString(thread_filename,MagickPathExtent,"%.20g|%s",
-    (double) GetMagickThreadId(),filename);
-}
-
 static inline ImageType IdentifyImageCoderType(const Image *image,
   ExceptionInfo *exception)
 {