FIXED: rexm's makefile and default paths (#5224)

* FIXED: rexm's makefile and default paths

Fixed a windows only backslash in
rexm's makefile causing build errors on macOS and linux

Added unix paths to rexm for better compatibility

* Update rexm.c

Readded the fall-through in OP_CREATE

Added some safety checks to UpdateRequiredFiles() so it plays nicely outside of the raylib.com context (would segfault previously)

tools/rexm/Makefile

@@ -35,7 +35,7 @@ PROJECT_BUILD_PATH    ?= .
 PROJECT_SOURCE_FILES  ?= rexm.c
 
 # raylib library variables
-RAYLIB_SRC_PATH       ?= ..\..\src
+RAYLIB_SRC_PATH       ?= ../../src
 RAYLIB_INCLUDE_PATH   ?= $(RAYLIB_SRC_PATH)
 RAYLIB_LIB_PATH       ?= $(RAYLIB_SRC_PATH)
 
@@ -363,4 +363,3 @@ ifeq ($(PLATFORM),PLATFORM_WEB)
 	del *.o *.html *.js
 endif
 	@echo Cleaning done
-

tools/rexm/rexm.c

@@ -205,12 +205,22 @@ int main(int argc, char *argv[])
     exCollectionFilePath = getenv("REXM_EXAMPLES_COLLECTION_FILE_PATH");
     exVSProjectSolutionFile = getenv("REXM_EXAMPLES_VS2022_SLN_FILE");
 
+#if defined(_WIN32)
     if (!exBasePath) exBasePath = "C:/GitHub/raylib/examples";
     if (!exWebPath) exWebPath = "C:/GitHub/raylib.com/examples";
     if (!exTemplateFilePath) exTemplateFilePath = "C:/GitHub/raylib/examples/examples_template.c";
     if (!exTemplateScreenshot) exTemplateScreenshot = "C:/GitHub/raylib/examples/examples_template.png";
     if (!exCollectionFilePath) exCollectionFilePath = "C:/GitHub/raylib/examples/examples_list.txt";
     if (!exVSProjectSolutionFile) exVSProjectSolutionFile = "C:/GitHub/raylib/projects/VS2022/raylib.sln";
+#else
+    // Cross-platform relative fallbacks (run from tools/rexm directory)
+    if (!exBasePath) exBasePath = "../../examples";
+    if (!exWebPath) exWebPath = "../../raylib.com/examples";
+    if (!exTemplateFilePath) exTemplateFilePath = "../../examples/examples_template.c";
+    if (!exTemplateScreenshot) exTemplateScreenshot = "../../examples/examples_template.png";
+    if (!exCollectionFilePath) exCollectionFilePath = "../../examples/examples_list.txt";
+    if (!exVSProjectSolutionFile) exVSProjectSolutionFile = "../../projects/VS2022/raylib.sln";
+#endif
 
     char inFileName[1024] = { 0 };  // Example input filename (to be added)
 
@@ -1660,11 +1670,22 @@ static int UpdateRequiredFiles(void)
     // NOTE: Entries format: exampleEntry('⭐️☆☆☆' , 'core'    , 'basic_window'),
     //------------------------------------------------------------------------------------------------
     char *jsText = LoadFileText(TextFormat("%s/../common/examples.js", exWebPath));
-    char *jsTextUpdated = (char *)RL_CALLOC(REXM_MAX_BUFFER_SIZE, 1); // Updated examples.js copy, 2MB
+    if (!jsText)
-
+    {
+        LOG("INFO: examples.js not found, skipping web examples list update\n");
+    }
+    else
+    {
         int jsListStartIndex = TextFindIndex(jsText, "//EXAMPLE_DATA_LIST_START");
         int jsListEndIndex = TextFindIndex(jsText, "//EXAMPLE_DATA_LIST_END");
-
+        if ((jsListStartIndex < 0) || (jsListEndIndex < 0))
+        {
+            LOG("WARNING: examples.js markers not found, skipping update\n");
+            UnloadFileText(jsText);
+        }
+        else
+        {
+            char *jsTextUpdated = (char *)RL_CALLOC(REXM_MAX_BUFFER_SIZE, 1); // Updated examples.js copy, 2MB
             int jsIndex = 0;
             memcpy(jsTextUpdated, jsText, jsListStartIndex);
             jsIndex = sprintf(jsTextUpdated + jsListStartIndex, "//EXAMPLE_DATA_LIST_START\n");
@@ -1708,6 +1729,8 @@ static int UpdateRequiredFiles(void)
             SaveFileText(TextFormat("%s/../common/examples.js", exWebPath), jsTextUpdated);
             UnloadFileText(jsText);
             RL_FREE(jsTextUpdated);
+        }
+    }
     //------------------------------------------------------------------------------------------------
 
     return result;