go back to cbreak mode and disable_signals() instead of raw mode, as

disable_signals() doesn't take up much space and we need one fewer slang
workaround that way


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1748 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -125,10 +125,8 @@ CVS code -
 	  mode should only affect how the "Read File" command behaves
 	  anyway. (DLR)
 	- Remove the disabling of implementation-defined input
-	  processing, as raw mode appears to turn it off anyway. (DLR)
-	- Use raw mode instead of cbreak mode, since it comes closest to
-	  what we need by automatically disabling the special control
-	  keys. (DLR)
+	  processing, as cbreak mode appears to turn it off anyway.
+	  (DLR)
 	- After noecho(), call disable_signals() and
 	  disable_flow_control(), the latter only if PRESERVE is not
 	  set. (DLR)

src/nano.c

@@ -829,6 +829,8 @@ int open_pipe(const char *command)
     /* Before we start reading the forked command's output, we set
      * things up so that ^C will cancel the new process. */
 
+    /* Enable interpretation of the special control keys so that we get
+     * SIGINT when Ctrl-C is pressed. */
     enable_signals();
 
     if (sigaction(SIGINT, NULL, &newaction) == -1) {
@@ -860,6 +862,8 @@ int open_pipe(const char *command)
     if (cancel_sigs != 1 && sigaction(SIGINT, &oldaction, NULL) == -1)
 	nperror("sigaction");
 
+    /* Disable interpretation of the special control keys so that we can
+     * use Ctrl-C for other things. */
     disable_signals();
 
     return 0;
@@ -2954,7 +2958,6 @@ void do_toggle(const toggle *which)
 }
 #endif /* !NANO_SMALL */
 
-#if !defined(NANO_SMALL) || defined(USE_SLANG)
 void disable_signals(void)
 {
     struct termios term;
@@ -2963,7 +2966,6 @@ void disable_signals(void)
     term.c_lflag &= ~ISIG;
     tcsetattr(0, TCSANOW, &term);
 }
-#endif
 
 #ifndef NANO_SMALL
 void enable_signals(void)
@@ -3401,25 +3403,21 @@ int main(int argc, char *argv[])
     tcgetattr(0, &oldterm);
 
    /* Curses initialization stuff: Start curses, save the state of the
-    * terminal mode, put the terminal in raw mode (read one character at
-    * a time and don't interpret the special control keys), disable
+    * terminal mode, put the terminal in cbreak mode (read one character
+    * at a time and interpret the special control keys), disable
     * translation of carriage return (^M) into newline (^J) so that we
     * can tell the difference between the Enter key and Ctrl-J, and
-    * disable echoing of characters as they're typed.  Finally, if we're
-    * in preserve mode, turn the flow control characters back on. */
+    * disable echoing of characters as they're typed.  Finally, disable
+    * interpretation of the special control keys, and if we're not in
+    * preserve mode, disable interpretation of the flow control
+    * characters too. */
     initscr();
-    raw();
-#ifdef USE_SLANG
-    /* Slang curses emulation brain damage, part 2: Raw mode acts just
-     * like cbreak mode here and doesn't disable interpretation of the
-     * special control keys.  Work around this by manually disabling
-     * interpretation of the special control keys. */
-    disable_signals();
-#endif
+    cbreak();
     nonl();
     noecho();
-    if (ISSET(PRESERVE))
-	enable_flow_control();
+    disable_signals();
+    if (!ISSET(PRESERVE))
+	disable_flow_control();
 
 #ifndef NANO_SMALL
     /* Save the terminal's current state, so that we can restore it

src/nano.h

@@ -56,7 +56,7 @@
 #ifdef USE_SLANG
 /* Slang support enabled. */
 #include <slcurses.h>
-/* Slang curses emulation brain damage, part 3: Slang doesn't define the
+/* Slang curses emulation brain damage, part 2: Slang doesn't define the
  * curses equivalents of the Insert or Delete keys. */
 #define KEY_DC SL_KEY_DELETE
 #define KEY_IC SL_KEY_IC