ADDED: `IsFileNameValid()`

src/raylib.h

@@ -1124,6 +1124,7 @@ RLAPI const char *GetWorkingDirectory(void);                      // Get current
 RLAPI const char *GetApplicationDirectory(void);                  // Get the directory of the running application (uses static string)
 RLAPI bool ChangeDirectory(const char *dir);                      // Change working directory, return true on success
 RLAPI bool IsPathFile(const char *path);                          // Check if a given path is a file or a directory
+RLAPI bool IsFileNameValid(const char *fileName);                // Check if fileName is valid for the platform/OS
 RLAPI FilePathList LoadDirectoryFiles(const char *dirPath);       // Load directory filepaths
 RLAPI FilePathList LoadDirectoryFilesEx(const char *basePath, const char *filter, bool scanSubdirs); // Load directory filepaths with extension filtering and recursive directory scan
 RLAPI void UnloadDirectoryFiles(FilePathList files);              // Unload filepaths

src/rcore.c

@@ -2244,6 +2244,64 @@ bool IsPathFile(const char *path)
     return S_ISREG(result.st_mode);
 }
 
+// Check if fileName is valid for the platform/OS
+bool IsFileNameValid(const char *fileName)
+{
+    bool valid = true;
+
+    if ((fileName != NULL) && (fileName[0] != '\0'))
+    {
+        int length = strlen(fileName);
+        bool allPeriods = true;
+
+        for (int i = 0; i < length; i++)
+        {
+            // Check invalid characters
+            if ((fileName[i] == '<') ||
+                (fileName[i] == '>') ||
+                (fileName[i] == ':') ||
+                (fileName[i] == '\"') ||
+                (fileName[i] == '/') ||
+                (fileName[i] == '\\') ||
+                (fileName[i] == '|') ||
+                (fileName[i] == '?') ||
+                (fileName[i] == '*')) { valid = false; break; }
+
+            // Check non-glyph characters
+            if ((unsigned char)fileName[i] < 32) { valid = false; break; }
+
+            // TODO: Check trailing periods/spaces?
+
+            // Check if filename is not all periods
+            if (fileName[i] != '.') allPeriods = false;
+        }
+
+        if (allPeriods) valid = false;
+
+/*
+        if (valid)
+        {
+            // Check invalid DOS names
+            if (length >= 3)
+            {
+                if (((fileName[0] == 'C') && (fileName[1] == 'O') && (fileName[2] == 'N')) ||   // CON
+                    ((fileName[0] == 'P') && (fileName[1] == 'R') && (fileName[2] == 'N')) ||   // PRN
+                    ((fileName[0] == 'A') && (fileName[1] == 'U') && (fileName[2] == 'X')) ||   // AUX
+                    ((fileName[0] == 'N') && (fileName[1] == 'U') && (fileName[2] == 'L'))) valid = false; // NUL
+            }
+
+            if (length >= 4)
+            {
+                if (((fileName[0] == 'C') && (fileName[1] == 'O') && (fileName[2] == 'M') && ((fileName[3] >= '0') && (fileName[3] <= '9'))) ||  // COM0-9
+                    ((fileName[0] == 'L') && (fileName[1] == 'P') && (fileName[2] == 'T') && ((fileName[3] >= '0') && (fileName[3] <= '9')))) valid = false; // LPT0-9
+            }
+        }
+*/
+    }
+
+    return valid;
+}
+
 // Check if a file has been dropped into window
 bool IsFileDropped(void)
 {