next: https://viewsourcecode.org/snaptoken/kilo/03.rawInputAndOutput.…

…html#clear-the-screen

kilo.c

@@ -9,7 +9,7 @@
 
 /*** difnes ***/
 
-#define CTRL_KEY(k) ((k) & 0x1f)
+#define CTRL_KEY(k) ((k)&0x1f)
 
 /*** data ***/
 
@@ -41,20 +41,33 @@ void enableRawMode() {
   if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) die("tcsetattr");
 }
 
+char editorReadKey() {
+  int nread;
+  char c;
+  while ((nread = read(STDIN_FILENO, &c, 1)) != 1) {
+    if (nread == -1 && errno != EAGAIN) die("read");
+  }
+  return c;
+}
+
+/*** input ***/
+void editorProcessKeyPress() {
+  char c = editorReadKey();
+
+  switch (c) {
+    case CTRL_KEY('q'):
+      exit(0);
+      break;
+  }
+}
+
 /*** init ***/
 
 int main() {
   enableRawMode();
 
   while (1) {
-    char c = '\0';
-    if (read(STDIN_FILENO, &c, 1) == -1 && errno != EAGAIN) die("read");
-    if (iscntrl(c)) {
-      printf("%d\r\n", c);
-    } else {
-      printf("%d ('%c')\r\n", c, c);
-    }
-    if (c == CTRL_KEY('q')) break;
+    editorProcessKeyPress();
   }
 
   return 0;