From 058608e1586891e4e40beb8785a3317957658365 Mon Sep 17 00:00:00 2001
From: Pierre Habouzit <madcoder@debian.org>
Date: Fri, 10 Aug 2007 17:28:31 +0200
Subject: [PATCH] More optimizations

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
---
 demo/boxshell.c |  3 ---
 madtty/madtty.c | 60 +++++++++++++++++++++++--------------------------
 2 files changed, 28 insertions(+), 35 deletions(-)

diff --git a/demo/boxshell.c b/demo/boxshell.c
index dbb47e4..b3c8f2d 100644
--- a/demo/boxshell.c
+++ b/demo/boxshell.c
@@ -27,8 +27,6 @@ int main(void)
 {
     struct timeval next = { 0, 0 };
     madtty_t *rt;
-    int pos = 0;
-    char buf[BUFSIZ];
 
     signal(SIGCHLD, sigchld);
 
@@ -47,7 +45,6 @@ int main(void)
 
     /* keep reading keypresses from the user and passing them to the terminal;
      * also, redraw the terminal to the window at each iteration */
-    pos = 0;
     while (!getout) {
         fd_set rfds;
         struct timeval tv = { 0 , 1000 }, t;
diff --git a/madtty/madtty.c b/madtty/madtty.c
index 2b5fae2..289172e 100644
--- a/madtty/madtty.c
+++ b/madtty/madtty.c
@@ -65,7 +65,6 @@ static void mtty_row_set(mtty_row_t *row, int start, int len, uint16_t attr)
     }
 }
 
-__attribute__((noinline))
 static void mtty_row_roll(mtty_row_t *start, mtty_row_t *end, int count)
 {
     int n = end - start;
@@ -124,6 +123,7 @@ static void cursor_line_up(madtty_t *rt)
     mtty_row_set(rt->curs_row, 0, rt->cols, 0);
 }
 
+__attribute__((const))
 static uint16_t build_attrs(unsigned curattrs)
 {
     return ((curattrs & ~A_COLOR) | COLOR_PAIR(curattrs & 0xff))
@@ -295,36 +295,28 @@ static void interpret_csi_SGR(madtty_t *rt, int param[], int pcount)
 /* interprets an 'erase display' (ED) escape sequence */
 static void interpret_csi_ED(madtty_t *rt, int param[], int pcount)
 {
-    int r;
-    int start_row, start_col, end_row, end_col;
+    mtty_row_t *row, *start, *end;
+    attr_t attr = build_attrs(rt->curattrs);
 
     /* decide range */
     if (pcount && param[0] == 2) {
-        start_row = 0;
-        start_col = 0;
-        end_row = rt->rows - 1;
-        end_col = rt->cols - 1;
+        start = rt->lines;
+        end   = rt->lines + rt->rows;
     } else
     if (pcount && param[0] == 1) {
-        start_row = 0;
-        start_col = 0;
-        end_row = rt->curs_row - rt->lines;
-        end_col = rt->curs_col;
+        start = rt->lines;
+        end   = rt->curs_row;
+        mtty_row_set(rt->curs_row, 0, rt->curs_col + 1, attr);
     } else {
-        start_row = rt->curs_row - rt->lines;
-        start_col = rt->curs_col;
-        end_row = rt->rows - 1;
-        end_col = rt->cols - 1;
+        mtty_row_set(rt->curs_row, rt->curs_col,
+                     rt->cols - rt->curs_col, attr);
+        start = rt->curs_row + 1;
+        end   = rt->lines + rt->rows;
     }
 
-    /* clean range */
-    mtty_row_set(rt->lines + start_row, start_col, rt->cols - start_col,
-                 build_attrs(rt->curattrs));
-    for (r = start_row + 1; r < end_row; r++) {
-        mtty_row_set(rt->lines + r, 0, rt->cols, build_attrs(rt->curattrs));
+    for (row = start; row < end; row++) {
+        mtty_row_set(row, 0, rt->cols, attr);
     }
-    mtty_row_set(rt->lines + end_row, 0, end_col + 1,
-                 build_attrs(rt->curattrs));
 }
 
 /* interprets a 'move cursor' (CUP) escape sequence */
@@ -397,6 +389,10 @@ static void interpret_csi_ICH(madtty_t *rt, int param[], int pcount)
     int n = (pcount && param[0] > 0) ? param[0] : 1;
     int i;
 
+    if (rt->curs_col + n > rt->cols) {
+        n = rt->cols - rt->curs_col;
+    }
+
     for (i = rt->cols - 1; i >= rt->curs_col + n; i--) {
         row->text[i] = row->text[i - n];
         row->attr[i] = row->attr[i - n];
@@ -412,15 +408,16 @@ static void interpret_csi_DCH(madtty_t *rt, int param[], int pcount)
     int n = (pcount && param[0] > 0) ? param[0] : 1;
     int i;
 
-    for (i = rt->curs_col; i < rt->cols; i++) {
-        if (i + n < rt->cols) {
-            row->text[i] = row->text[i + n];
-            row->attr[i] = row->attr[i + n];
-        } else {
-            row->text[i] = 0;
-            row->attr[i] = build_attrs(rt->curattrs);
-        }
+    if (rt->curs_col + n > rt->cols) {
+        n = rt->cols - rt->curs_col;
+    }
+
+    for (i = rt->curs_col; i < rt->cols - n; i++) {
+        row->text[i] = row->text[i + n];
+        row->attr[i] = row->attr[i + n];
     }
+
+    mtty_row_set(row, rt->cols - n, n, build_attrs(rt->curattrs));
 }
 
 /* Interpret an 'insert line' sequence (IL) */
@@ -452,7 +449,6 @@ static void interpret_csi_DL(madtty_t *rt, int param[], int pcount)
         }
     } else {
         mtty_row_roll(rt->curs_row, rt->scroll_bot, -n);
-
         for (mtty_row_t *row = rt->scroll_bot - n; row < rt->scroll_bot; row++) {
             mtty_row_set(row, 0, rt->cols, build_attrs(rt->curattrs));
         }
@@ -485,7 +481,7 @@ static void interpret_csi_DECSTBM(madtty_t *rt, int param[], int pcount)
 
       case 2:
         new_top = param[0] - 1;
-        new_bot = param[1] - 1;
+        new_bot = param[1];
 
         /* clamp to bounds */
         if (new_top < 0)
-- 
2.20.1