File Tk-804.036-fix-strlen-vs-int-pointer-confusion.... of Package perl-Tk

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File Tk-804.036-fix-strlen-vs-int-pointer-confusion.patch of Package perl-Tk (Revision ced94004cb4d88f2854e02a5516a3b78)

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From a26233c844c52f49ef9cca5f88dd9063aac60d0f Mon Sep 17 00:00:00 2001
From: Niko Tyni <ntyni@debian.org>
Date: Thu, 11 Jan 2024 18:28:58 +0000
Subject: [PATCH] Fix STRLEN vs int pointer confusion in Tcl_GetByteArrayFromObj()

Perl 5.37.2, more precisely commit

https://github.com/Perl/perl5/commit/1ef9039bccbfe64f47f201b6cfb7d6d23e0b08a7

changed the implementation of SvPV() et al., breaking t/balloon.t,
t/canvas2.t and t/photo.t on big-endian 64-bit architectures such as
ppc64 and s390x because StringMatchGIF() no longer recognized GIF files.

This is because Tcl_GetByteArrayFromObj() was calling SvPV() with an int
pointer instead of a correct STRLEN pointer, and the new implementation
is more sensitive to this: it assigns the pointers as-is, resulting in
the int pointer pointing at the wrong end of the 64-bit length.

Other functions taking a length pointer, at least Tcl_GetStringFromObj()
already seem to do things correctly, so presumably this is not a
systematic issue.
---
 objGlue.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git objGlue.c objGlue.c
index d4927ea..dbd6a50 100644
--- objGlue.c
+++ objGlue.c
@@ -627,7 +627,10 @@ Tcl_GetByteArrayFromObj(Tcl_Obj * objPtr, int * lengthPtr)
  sv_utf8_downgrade(objPtr, 0);
  if (lengthPtr)
   {
-   return (unsigned char *) SvPV(objPtr, *lengthPtr);
+   STRLEN len;
+   unsigned char *s = SvPV(objPtr, len);
+   *lengthPtr = len;
+   return s;
   }
  else
   {
-- 
2.30.2

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File Tk-804.036-fix-strlen-vs-int-pointer-confusion.patch of Package perl-Tk (Revision ced94004cb4d88f2854e02a5516a3b78)

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