Add fs_is_file to check if a given path is file

src/base/system.cpp

@@ -2333,6 +2333,21 @@ int fs_removedir(const char *path)
 #endif
 }
 
+int fs_is_file(const char *path)
+{
+#if defined(CONF_FAMILY_WINDOWS)
+	WCHAR wPath[IO_MAX_PATH_LENGTH];
+	dbg_assert(MultiByteToWideChar(CP_UTF8, 0, path, -1, wPath, std::size(wPath)) > 0, "MultiByteToWideChar failure");
+	DWORD attributes = GetFileAttributesW(wPath);
+	return attributes != INVALID_FILE_ATTRIBUTES && !(attributes & FILE_ATTRIBUTE_DIRECTORY) ? 1 : 0;
+#else
+	struct stat sb;
+	if(stat(path, &sb) == -1)
+		return 0;
+	return S_ISREG(sb.st_mode) ? 1 : 0;
+#endif
+}
+
 int fs_is_dir(const char *path)
 {
 #if defined(CONF_FAMILY_WINDOWS)

src/base/system.h

@@ -1878,6 +1878,19 @@ int fs_makedir_rec_for(const char *path);
  */
 int fs_storage_path(const char *appname, char *path, int max);
 
+/**
+ * Checks if a file exists.
+ *
+ * @ingroup Filesystem
+ *
+ * @param path the path to check.
+ *
+ * @return 1 if a file with the given path exists,
+ * 0 on failure or if the file does not exist.
+ *
+ * @remark The strings are treated as zero-terminated strings.
+ */
+int fs_is_file(const char *path);
 
 /**
  * Checks if a folder exists.