add "rewind()" member function to Text and Potential file reader classes

src/potential_file_reader.cpp

@@ -92,6 +92,13 @@ void PotentialFileReader::ignore_comments(bool value)
   reader->ignore_comments = value;
 }
 
+/** Reset file to the beginning */
+
+void PotentialFileReader::rewind()
+{
+  reader->rewind();
+}
+
 /** Read a line but ignore its content */
 
 void PotentialFileReader::skip_line()

src/potential_file_reader.h

@@ -43,6 +43,7 @@ class PotentialFileReader : protected Pointers {
 
   void ignore_comments(bool value);
 
+  void rewind();
   void skip_line();
   char *next_line(int nparams = 0);
   void next_dvector(double *list, int n);

src/text_file_reader.cpp

@@ -82,6 +82,13 @@ TextFileReader::~TextFileReader()
   if (closefp) fclose(fp);
 }
 
+/** Reset file to the beginning */
+
+void TextFileReader::rewind()
+{
+  ::rewind(fp);
+}
+
 /** Read the next line and ignore it */
 
 void TextFileReader::skip_line()

src/text_file_reader.h

@@ -38,6 +38,7 @@ class TextFileReader {
 
   ~TextFileReader();
 
+  void rewind();
   void skip_line();
   char *next_line(int nparams = 0);