xcur2png: fix cross-build (#343074)

{ lib, stdenv, fetchFromGitHub, pkg-config, libpng, xorg }:

{

  lib,

  stdenv,

  fetchFromGitHub,

  fetchpatch,

  pkg-config,

  libpng,

  xorg,

}:

stdenv.mkDerivation rec {

  pname = "xcur2png";

    sha256 = "0858wn2p14bxpv9lvaz2bz1rk6zk0g8zgxf8iy595m8fqv4q2fya";

  };

  patches = [

    # https://github.com/eworm-de/xcur2png/pull/3

    ./malloc.diff

    # fix byte overflows due to off-by-one error

    (fetchpatch {

      url = "https://github.com/eworm-de/xcur2png/commit/aa035462d950fab35d322cb87fd2f0d702251e82.patch";

      hash = "sha256-hlmJ/bcDSl1ADs0jp+JrAgAaMzielUSRVPad+plnSZg=";

    })

  ];

  nativeBuildInputs = [

    pkg-config

  ];

--- a/xcur2png.c

+++ b/xcur2png.c

@@ -16,7 +16,10 @@

 /* Todo: atoi error handling */

 /* help is -h in manual */

+#if HAVE_CONFIG_H

 #include <config.h>

+#endif

+#undef malloc

 #define _ATFILE_SOURCE

 #include <stdio.h>

@@ -34,6 +37,19 @@

 #include <png.h>

 #include <X11/Xcursor/Xcursor.h>

+

+void *malloc ();

+

+/* Allocate an N-byte block of memory from the heap.

+   If N is zero, allocate a 1-byte block.  */

+

+void* rpl_malloc (size_t n)

+{

+  if (n == 0)

+    n = 1;

+  return malloc (n);

+}

+

 #define PNG_SETJMP_NOT_SUPPORTED 1

 #define PROGRESS_SHARPS 50 /* total number of progress sharps */