Added some more compatibility modes

nne.c

@@ -34,19 +34,23 @@
 #ifndef SIGWINCH 
 #define SIGWINCH 28
 #endif
-#ifndef IUTF8
-#define IUTF8 0x4000
-#endif
 
 /* terminal control macros (constants) */
 #define ERESET "\x1b[0m"      /* reset the styling */
 #define CLS "\x1b[2J"         /* clear the entire screen */
 #define LINECLR "\x1b[2K"     /* clear the current line */
 #define CURRESET "\x1b[0;0H"  /* reset the visual cursor */
+#ifdef NNE_NO_ALTBUF          /* can be defined for legacy terminals */
+#define CURSHOW ""
+#define CURHIDE ""
+#define ALTBUFON ""
+#define ALTBUFOFF ""
+#else
 #define CURSHOW "\x1b[?25h"   /* show the cursor */
 #define CURHIDE "\x1b[?25l"   /* hide the cursor */
-#define ALTBUFON "\x1b[?47h"  /* turn on alternate screen */
+#define ALTBUFON "\x1b[?47h\x1b%G"  /* turn on alternate screen + UTF-8 */
 #define ALTBUFOFF "\x1b[?47l" /* turn off alternate screen */
+#endif
 
 /* terminal control macros (sprintf templates) */
 #define CURSET "\x1b[%03u;%03uH"  /* set the cursor position (line;col) */
@@ -847,7 +851,7 @@ int nne_action(int key) {
 
 int main(int argc, char* argv[]) { /* editor entry point */
   /* use the alternative screen buffer and enable UTF-8 */
-  nnputs(ALTBUFON CLS "\x1b%G\x1b[?7h");
+  nnputs(ALTBUFON CLS "\x1b[?7h");
   /* prepare screen */
   tcgetattr(0, &tty_opts_backup);
   atexit(&cleanup);
@@ -860,7 +864,7 @@ int main(int argc, char* argv[]) { /* editor entry point */
   tty_opts_raw.c_cflag |= CS8;
   tty_opts_raw.c_cc[VMIN] = 0;
   tty_opts_raw.c_cc[VTIME] = 1;
-  tty_opts_raw.c_iflag |= IUTF8;
+  tty_opts_raw.c_iflag |= 0x4000; /* IUTF8 */
   tcsetattr(0, TCSANOW, &tty_opts_raw);
   nne_scrbuf = malloc(0); /* allocate the minimum for screen */
   resizehandler(SIGWINCH); /* populate the dimensions now */