--- a/dmutil.h	Mon Dec 16 06:51:40 2019 +0200
+++ b/dmutil.h	Mon Dec 16 07:51:05 2019 +0200
@@ -14,11 +14,14 @@
 #include <cstdio>
 #include <iostream>
 #include <cstdarg>
+#include <fstream>
 
 
 #define DMUTIL_WHITESPACE "\t\n\v\f\r "
 
 
+/* Functions
+ */
 void dmMsg_V(const char *fmt, va_list ap);
 void dmMsg(const char *fmt, ...);
 void dmError_V(const char *fmt, va_list ap);
@@ -38,4 +41,40 @@
 bool dmFileExists(const std::string &filename, std::ios_base::openmode mode = std::ios_base::in);
 
 
+/* Structures and classes
+ */
+struct DMTextFileInfo
+{
+    int nline, state;
+    std::string filename;
+    std::string line;
+    std::ifstream file;
+    std::string *key;
+
+    virtual bool syntaxError(const std::string &msg)
+    {
+        dmError("Syntax error on line #%d: %s\n",
+            nline, msg.c_str());
+        return false;
+    }
+
+    virtual bool textError(const std::string &msg)
+    {
+        dmError("%s on line #%d: %s\n",
+            msg.c_str(), nline, line.c_str());
+        return false;
+    }
+
+    virtual bool readLine(void)
+    {
+        if (!std::getline(file, line))
+            return false;
+
+        nline++;
+        line = dmStrTrim(line);
+        return true;
+    }
+};
+
+
 #endif