Use arc4random if available

.gitignore

@@ -8,6 +8,7 @@ cmake_install.cmake
 config.h
 install_manifest.txt
 mazemaker
+*.dylib
 *.tar.gz
 *.png
 *.pc

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required (VERSION 3.0)
 cmake_policy(VERSION 3.0)
-project (mazemaker VERSION 1.4)
+project (mazemaker VERSION 1.5)
 
 SET(EXEC_INSTALL_PREFIX ${CMAKE_INSTALL_PREFIX} CACHE PATH "Installation prefix for executables and object code libraries" FORCE)
 SET(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/include CACHE PATH "Installation prefix for C header files" FORCE)

lib/CMakeLists.txt

@@ -1,5 +1,8 @@
 project(mazemaker_lib)
 cmake_minimum_required (VERSION 2.8.12)
+
+include(CheckSymbolExists)
+
 set (mazemaker_SOVERSION_CURRENT    0)
 set (mazemaker_SOVERSION_REVISION   2)
 set (mazemaker_SOVERSION_AGE        0)
@@ -11,6 +14,11 @@ set (mazemaker_SOVERSION ${mazemaker_SOVERSION_MAJOR}.${mazemaker_SOVERSION_MINO
 find_package(PkgConfig REQUIRED)
 pkg_search_module(PNG REQUIRED libpng)
 
+check_symbol_exists(arc4random_uniform "stdlib.h" HAVE_ARC4RANDOM)
+
+configure_file ("${CMAKE_CURRENT_SOURCE_DIR}/config.h.in"
+                "${CMAKE_CURRENT_SOURCE_DIR}/config.h" )
+
 file(GLOB SOURCES *.c *.h)
 
 add_library(mazemaker_shared SHARED ${SOURCES})

lib/config.h.in

@@ -0,0 +1 @@
+#cmakedefine HAVE_ARC4RANDOM "@HAVE_ARC4RANDOM@"

lib/grid.c

@@ -1,5 +1,6 @@
 #include <stdlib.h>
 #include "grid.h"
+#include "config.h"
 
 #define MAX_EDGE_WEIGHT 100
 #define TOP_LEFT_CORNER "\xe2\x94\x8f"
@@ -18,6 +19,14 @@
 #define HORIZONTAL_HALF_LEFT "\xe2\x95\xb8"
 #define HORIZONTAL_HALF_RIGHT "\xe2\x95\xba"
 
+static edgeweight_t random_edgeweight() {
+#ifdef HAVE_ARC4RANDOM
+    return arc4random_uniform(MAX_EDGE_WEIGHT);
+#else // HAVE_ARC4RANDOM
+    return random()%MAX_EDGE_WEIGHT;
+#endif // HAVE_ARC4RANDOM
+}
+
 mazegrid_t mazegrid_new(size_t width, size_t height) {
     mazeedges_t** grid = calloc(height, sizeof(mazeedges_t*));
     for (size_t i = 0; i < height; i++) {
@@ -66,8 +75,8 @@ edgeweight_t mazegrid_get_edge(mazegrid_t const* g, size_t x, size_t y, mazeedge
 void mazegrid_randomize(mazegrid_t* g) {
     for (size_t i = 0; i < g->height; i++) {
         for (size_t j = 0; j < g->width; j++) {
-            if (i < g->height - 1) g->grid[i][j].up = (edgeweight_t)(random()%MAX_EDGE_WEIGHT);
-            if (j < g->width - 1) g->grid[i][j].right = (edgeweight_t)(random()%MAX_EDGE_WEIGHT);
+            if (i < g->height - 1) g->grid[i][j].up = random_edgeweight();
+            if (j < g->width - 1) g->grid[i][j].right = random_edgeweight();
         }
     }
 }

utils/CMakeLists.txt

@@ -4,6 +4,7 @@ pkg_search_module(POPT REQUIRED popt)
 include_directories("../include" ${POPT_INCLUDE_DIRS})
 
 add_executable(mazemaker mazemaker.c)
+target_link_directories(mazemaker PUBLIC ${POPT_LIBRARY_DIRS})
 target_link_libraries(mazemaker mazemaker_shared ${POPT_LIBRARIES})
 
 install (TARGETS mazemaker DESTINATION bin)