Refactoring FTerm::init_termcaps

ChangeLog

@@ -1,3 +1,6 @@
+2017-02-19  Markus Gans  <guru.mail@muenster.de>
+	* Refactoring FTerm::init_termcaps
+
 2017-02-18  Markus Gans  <guru.mail@muenster.de>
 	* Avoid scroll bar overshooting
 	* Refactoring FListView::onMouseMove

examples/termcap.cpp

@@ -31,7 +31,7 @@
 static FVTerm* terminal;
 
 // Function prototype
-void tcapBooleans (const std::string&, bool);
+void tcapBoolean (const std::string&, bool);
 void tcapNumeric (const std::string&, int);
 void tcapString (const std::string&, const char[]);
 void debug (FApplication&);
@@ -142,7 +142,7 @@ const int last_item = int ( sizeof(strings) / sizeof(strings[0]) ) - 1;
 //----------------------------------------------------------------------
 // Functions
 //----------------------------------------------------------------------
-void tcapBooleans (const std::string& name, bool cap_bool)
+void tcapBoolean (const std::string& name, bool cap_bool)
 {
   std::cout << "FTermcap::" << name << ": ";
 
@@ -232,19 +232,19 @@ void debug (FApplication& TermApp)
 void booleans()
 {
   std::cout << "\r\n[Booleans]\r\n";
-  tcapBooleans ( "background_color_erase"
+  tcapBoolean ( "background_color_erase"
               , FTermcap::background_color_erase );
-  tcapBooleans ( "automatic_left_margin"
+  tcapBoolean ( "automatic_left_margin"
               , FTermcap::automatic_left_margin );
-  tcapBooleans ( "automatic_right_margin"
+  tcapBoolean ( "automatic_right_margin"
               , FTermcap::automatic_right_margin );
-  tcapBooleans ( "eat_nl_glitch"
+  tcapBoolean ( "eat_nl_glitch"
               , FTermcap::eat_nl_glitch );
-  tcapBooleans ( "ansi_default_color"
+  tcapBoolean ( "ansi_default_color"
               , FTermcap::ansi_default_color );
-  tcapBooleans ( "osc_support"
+  tcapBoolean ( "osc_support"
               , FTermcap::osc_support );
-  tcapBooleans ( "no_utf8_acs_chars"
+  tcapBoolean ( "no_utf8_acs_chars"
               , FTermcap::no_utf8_acs_chars );
 }
 

include/final/fterm.h

@@ -495,8 +495,10 @@ class FTerm
     static void           init_cygwin_charmap();
     static void           init_teraterm_charmap();
     static void           init_termcaps();
+    static void           init_termcaps_error (int);
+    static void           init_termcaps_variables(char*&);
     static void           init_termcaps_booleans();
-    static void           init_termcaps_numeric();
+    static void           init_termcaps_numerics();
     static void           init_termcaps_strings (char*&);
     static void           init_termcaps_quirks();
 #if defined(__FreeBSD__) || defined(__DragonFly__)

src/fterm.cpp

@@ -3366,9 +3366,7 @@ void FTerm::init_teraterm_charmap()
 }
 
 //----------------------------------------------------------------------
-void FTerm::init_termcaps()
+/* Terminal capability data base
-{
-  /* Terminal capability data base
  * -----------------------------
  * Info under: man 5 terminfo
  *
@@ -3376,11 +3374,12 @@ void FTerm::init_termcaps()
  *   captoinfo - convert all termcap descriptions into terminfo descriptions
  *   infocmp   - print out terminfo description from the current terminal
  */
-  static const int
+void FTerm::init_termcaps()
-      success       =  1
+{
-    , no_entry      =  0
+  std::vector<std::string> terminals;
-    , db_not_found  = -1
+  std::vector<std::string>::iterator iter;
-    , uninitialized = -2;
+  static const int success = 1;
+  static const int uninitialized = -2;
   static char term_buffer[2048];
   static char string_buf[2048];
   char* buffer = string_buf;
@@ -3389,43 +3388,46 @@ void FTerm::init_termcaps()
   // share the terminal capabilities
   FTermcap().setTermcapMap(tcap);
 
-  if ( termtype[0] )
+  // open termcap file
+  terminals.push_back(termtype);            // available terminal type
+
+  if ( color256 )                           // 1st fallback if not found
+    terminals.push_back("xterm-256color");
+
+  terminals.push_back("xterm");             // 2nd fallback if not found
+  terminals.push_back("ansi");              // 3rd fallback if not found
+  terminals.push_back("vt100");             // 4th fallback if not found
+  iter = terminals.begin();
+
+  while ( iter != terminals.end() )
   {
-    // open the termcap file + load entry for termtype
+    // Copy c-string + terminating null-character ('\0')
+    std::strncpy (termtype, (*iter).c_str(), (*iter).length() + 1);
+
+    // Open the termcap file + load entry for termtype
     status = tgetent(term_buffer, termtype);
+
+    if ( status == success || ! terminal_detection )
+      break;
+
+    ++iter;
   }
 
-  if ( status != success && color256 )
+  if ( std::strncmp(termtype, "ansi", 4) == 0 )
-  {
-    // use "xterm-256color" as fallback if not found
-    std::strncpy (termtype, C_STR("xterm-256color"), 15);
-    status = tgetent(term_buffer, termtype);
-  }
-
-  if ( status != success )
-  {
-    // use "xterm" as fallback if not found
-    std::strncpy (termtype, C_STR("xterm"), 6);
-    status = tgetent(term_buffer, termtype);
-
-    if ( status != success )
-    {
-      // use "ansi" as fallback if not found
-      std::strncpy (termtype, C_STR("ansi"), 5);
-      status = tgetent(term_buffer, termtype);
     ansi_terminal = true;
 
-      if ( status != success )
+  init_termcaps_error (status);
-      {
+  init_termcaps_variables (buffer);
-        // use "vt100" as fallback if not found
+}
-        std::strncpy (termtype, C_STR("vt100"), 6);
-        status = tgetent(term_buffer, termtype);
-        ansi_terminal = false;
-      }
-    }
-  }
 
-  if ( status == no_entry )
+//----------------------------------------------------------------------
+void FTerm::init_termcaps_error (int status)
+{
+  static const int no_entry = 0;
+  static const int db_not_found = -1;
+  static const int uninitialized = -2;
+
+  if ( status == no_entry || status == uninitialized )
   {
     std::cerr << "Unknown terminal: "  << termtype << "\n"
               << "Check the TERM environment variable\n"
@@ -3438,12 +3440,16 @@ void FTerm::init_termcaps()
     std::cerr << "The termcap/terminfo database could not be found.\n";
     std::abort();
   }
+}
 
+//----------------------------------------------------------------------
+void FTerm::init_termcaps_variables (char*& buffer)
+{
   // Get termcap booleans
   init_termcaps_booleans();
 
-  // Get termcap numeric
+  // Get termcap numerics
-  init_termcaps_numeric();
+  init_termcaps_numerics();
 
   // Get termcap strings
   init_termcaps_strings(buffer);
@@ -3490,7 +3496,7 @@ void FTerm::init_termcaps_booleans()
 }
 
 //----------------------------------------------------------------------
-void FTerm::init_termcaps_numeric()
+void FTerm::init_termcaps_numerics()
 {
   // Get termcap numeric