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

…html#the-home-and-end-keys

kilo.c

@@ -15,7 +15,14 @@
 
 #define CTRL_KEY(k) ((k)&0x1f)
 
-enum editorKey { ARROW_LEFT = 1000, ARROW_RIGHT, ARROW_UP, ARROW_DOWN };
+enum editorKey {
+  ARROW_LEFT = 1000,
+  ARROW_RIGHT,
+  ARROW_UP,
+  ARROW_DOWN,
+  PAGE_UP,
+  PAGE_DOWN
+};
 
 /*** data ***/
 
@@ -72,15 +79,27 @@ int editorReadKey() {
     if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
 
     if (seq[0] == '[') {
-      switch (seq[1]) {
-        case 'A':
-          return ARROW_UP;
-        case 'B':
-          return ARROW_DOWN;
-        case 'C':
-          return ARROW_RIGHT;
-        case 'D':
-          return ARROW_LEFT;
+      if (seq[1] > '0' && seq[1] <= '9') {
+        if (read(STDIN_FILENO, &seq[2], 1) != 1) return '\x1b';
+        if (seq[2] == '~') {
+          switch (seq[1]) {
+            case '5':
+              return PAGE_UP;
+            case '6':
+              return PAGE_DOWN;
+          }
+        }
+      } else {
+        switch (seq[1]) {
+          case 'A':
+            return ARROW_UP;
+          case 'B':
+            return ARROW_DOWN;
+          case 'C':
+            return ARROW_RIGHT;
+          case 'D':
+            return ARROW_LEFT;
+        }
       }
     }
 
@@ -181,6 +200,12 @@ void editorProcessKeyPress() {
 
       exit(0);
       break;
+
+    case PAGE_UP:
+    case PAGE_DOWN: {
+      int times = E.screenrows;
+      while (times--) editorMoveCursor(c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
+    } break;
     case ARROW_UP:
     case ARROW_DOWN:
     case ARROW_LEFT: