A better terminal handling

equi.c

@@ -733,14 +733,21 @@ void equi_main_loop() {
   ram.ibp = 65535U;
 }
 
+#if !defined __CC65__ 
+struct termios tty_opts_raw, tty_opts_backup;
+void restore_term() {
+  /* restore the terminal settings */
+  tcsetattr(STDIN_FILENO, TCSANOW, &tty_opts_backup);
+}
+#endif
+
 /* Equi VM entry point */
 int main(int argc, char* argv[]) {
   uchar instr, bc, modec, smode = 0;
   FILE *prog = stdin;
   /* _attempt_ to disable buffering for char input/output */
 #if !defined __CC65__ 
-  struct termios tty_opts_raw, tty_opts_backup;
-  tcgetattr(STDIN_FILENO, &tty_opts_backup);
+  atexit(&restore_term);
   cfmakeraw(&tty_opts_raw);
   tcsetattr(STDIN_FILENO, TCSANOW, &tty_opts_raw);
 #endif
@@ -764,7 +771,6 @@ int main(int argc, char* argv[]) {
     else if(argv[2][0] == 's') /* enter silent mode, don't print the banners and prompts */
       smode = 1;
   }
-
   /* Start input buffering from the start of command buffer (-1 because we use prefix increment) */
   ram.ibp = 65535U;
   if(!ram.MM && !smode) { /* skip the terminal init and the greeting if in minification or silent mode */
@@ -777,7 +783,6 @@ int main(int argc, char* argv[]) {
 #endif
     printf("Welcome to Equi v" EQUI_VER " by Luxferre, 2022" CRLF "System RAM: %d bytes" CRLF "Equi ready" CRLF CRLF "> ", (int) sizeof(ram));
   }
-
   while(1) { /* Now, we're in the command mode loop */
     instr = fgetc(prog); /* Fetch the next instruction from the keyboard/file */
     if(instr == 0xFFU || instr == 0U || instr == 3U || instr == 4U) /* exit on zero byte or ctrl+C or ctrl+D */
@@ -839,10 +844,6 @@ int main(int argc, char* argv[]) {
         cputc(instr); /* echo it if not in silent mode */
     }
   } /* command mode loop end */
-#ifndef __CC65__
-  /* restore the terminal settings */
-  tcsetattr(STDIN_FILENO, TCSANOW, &tty_opts_backup);
-#endif
   fclose(prog); /* close the input file */
   return 0;
 }