kilo

commit 156653a2d53a2abe82c5383810000db0127243bb
parent 06dacdfa12189128fb57b9f611c2eff6e3d4169b
Author: Dimitrije Dobrota <mail@dimitrijedobrota.com>
Date:   Sun,  9 Apr 2023 09:30:55 +0200

Add some utils for better readability

Diffstat:
M
kilo.c
 | 
26
+++++++++++++++++++-------

1 file changed, 19 insertions(+), 7 deletions(-)
diff --git a/kilo.c b/kilo.c
@@ -16,6 +16,19 @@
 #include <time.h>
 #include <unistd.h>
 
+/*** utils ***/
+
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+
+#define RCLAMP(a, x, y)    (MAX((x), MIN((y), (a))))
+#define RCLAMP_LEFT(a, x)  (MAX((a), (x)))
+#define RCLAMP_RIGHT(a, x) (MIN((a), (x)))
+
+#define CLAMP(a, x, y)    ((a) = RCLAMP(a, x, y))
+#define CLAMP_LEFT(a, x)  ((a) = RCLAMP_LEFT(a, x))
+#define CLAMP_RIGHT(a, x) ((a) = RCLAMP_RIGHT(a, x))
+
 /*** defines ***/
 
 #define KILO_VERSION  "0.0.1"
@@ -297,7 +310,7 @@ void editorMoveCursor(int key) {
 
   row = (E.cy >= E.numrows) ? NULL : &E.row[E.cy];
   int rowlen = row ? row->size : 0;
-  if (E.cx > rowlen) { E.cx = rowlen; }
+  CLAMP_RIGHT(E.cx, rowlen);
 }
 
 void editorProcessKeypress() {
@@ -342,9 +355,9 @@ void editorProcessKeypress() {
 void editorScroll() {
   E.rx = 0;
   if (E.cy < E.numrows) { E.rx = editorRowCxToRx(&E.row[E.cy], E.cx); }
-  if (E.cy < E.rowoff) { E.rowoff = E.cy; }
+  CLAMP_RIGHT(E.rowoff, E.cy);
   if (E.cy >= E.rowoff + E.screenrows) { E.rowoff = E.cy - E.screenrows + 1; }
-  if (E.rx < E.coloff) { E.coloff = E.rx; }
+  CLAMP_RIGHT(E.coloff, E.rx);
   if (E.rx >= E.coloff + E.screencols) { E.coloff = E.rx - E.screencols + 1; }
 }
 
@@ -369,8 +382,7 @@ void editorDrawRows(struct abuf *ab) {
       }
     } else {
       int len = E.row[filerow].rsize - E.coloff;
-      if (len < 0) len = 0;
-      if (len > E.screencols) len = E.screencols;
+      CLAMP(len, 0, E.screencols);
       abAppend(ab, E.row[filerow].render + E.coloff, len);
     }
     abAppend(ab, "\x1b[K", 3); // clear current row
@@ -384,7 +396,7 @@ void editorDrawStatusBar(struct abuf *ab) {
   int len = snprintf(status, sizeof(status), "%.20s - %d lines",
                      E.filename ? E.filename : "[No Name]", E.numrows);
   int rlen = snprintf(rstatus, sizeof(rstatus), "%d/%d", E.cy + 1, E.numrows);
-  if (len > E.screencols) len = E.screencols;
+  CLAMP_RIGHT(len, E.screencols);
   abAppend(ab, status, len);
   while (len < E.screencols) {
     if (E.screencols - len == rlen) {
@@ -402,7 +414,7 @@ void editorDrawStatusBar(struct abuf *ab) {
 void editorDrawMessageBar(struct abuf *ab) {
   abAppend(ab, "\x1b[K", 3);
   int msglen = strlen(E.statusmsg);
-  if (msglen > E.screencols) msglen = E.screencols;
+  CLAMP_RIGHT(msglen, E.screencols);
   if (msglen && time(NULL) - E.statusmsg_time < 5)
     abAppend(ab, E.statusmsg, msglen);
 }