zbar: patch out segfault from overoptimization on darwin

From 3fa414aa82375648635281924904557cbe4d2d83 Mon Sep 17 00:00:00 2001

From: sasdf <asdf79852@gmail.com>

Date: Fri, 18 Oct 2024 00:22:36 +0800

Subject: [PATCH] Fix pointer wrap around undefined behavior

---

 zbar/img_scanner.c | 13 +++++++------

 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/zbar/img_scanner.c b/zbar/img_scanner.c

index d1bf8a3c..58436f16 100644

--- a/zbar/img_scanner.c

+++ b/zbar/img_scanner.c

@@ -33,6 +33,7 @@

 #endif

 #include <assert.h>

+#include <stddef.h>

 #include <stdlib.h> /* malloc, free */

 #include <string.h> /* memcmp, memset, memcpy */

@@ -50,7 +51,7 @@

 #include "svg.h"

 #if 1

-#define ASSERT_POS assert(p == data + x + y * (intptr_t)w)

+#define ASSERT_POS assert(p == data + x + y * (ptrdiff_t)w)

 #else

 #define ASSERT_POS

 #endif

@@ -858,11 +859,11 @@ static void zbar_send_code_via_dbus(zbar_image_scanner_t *iscn,

 }

 #endif

-#define movedelta(dx, dy)                \

-    do {                                 \

-	x += (dx);                       \

-	y += (dy);                       \

-	p += (dx) + ((uintptr_t)(dy)*w); \

+#define movedelta(dx, dy)                  \

+    do {                                   \

+        x += (dx);                         \

+        y += (dy);                         \

+        p += (dx) + ((dy)*(ptrdiff_t)(w)); \

     } while (0);

 static void *_zbar_scan_image(zbar_image_scanner_t *iscn, zbar_image_t *img)

      url = "https://github.com/mchehab/zbar/commit/a549566ea11eb03622bd4458a1728ffe3f589163.patch";

      hash = "sha256-NY3bAElwNvGP9IR6JxUf62vbjx3hONrqu9pMSqaZcLY=";

    })

    # PR from fork not yet merged into upstream

    # See PR: https://github.com/mchehab/zbar/pull/299

    # Remove this patch if the PR is merged or if the issue is solved another way.

    # See https://github.com/NixOS/nixpkgs/issues/456461 for discussion of the root issue

    ./darwin-segfault-optimized-pointer-assignment.patch

  ];

  nativeBuildInputs = [