added support for alternate screen. - st - simple terminal
HTML git clone https://git.parazyd.org/st
DIR Log
DIR Files
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DIR README
DIR LICENSE
---
DIR commit 12c25bcea973ced6e3b3b03f05cdb3f45fcd9f7f
DIR parent 326586ba434fb873ebdb81f385ebe838419a98a7
HTML Author: Aurélien Aptel <aurelien.aptel@gmail.com>
Date: Mon, 30 Aug 2010 16:48:18 +0200
added support for alternate screen.
Diffstat:
M st.c | 70 +++++++++++++++++++++++++-------
1 file changed, 56 insertions(+), 14 deletions(-)
---
DIR diff --git a/st.c b/st.c
@@ -50,7 +50,7 @@ enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT,
CURSOR_SAVE, CURSOR_LOAD };
enum { CURSOR_DEFAULT = 0, CURSOR_HIDE = 1, CURSOR_WRAPNEXT = 2 };
enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
-enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
+enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4, MODE_ALTSCREEN=8 };
enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
enum { SCREEN_UPDATE, SCREEN_REDRAW };
@@ -86,7 +86,8 @@ typedef struct {
typedef struct {
int row; /* nb row */
int col; /* nb col */
- Line* line; /* screen */
+ Line* line; /* screen */
+ Line* alt; /* alternate screen */
TCursor c; /* cursor */
int top; /* top scroll limit */
int bot; /* bottom scroll limit */
@@ -156,6 +157,7 @@ static void tscrolldown(int);
static void tsetattr(int*, int);
static void tsetchar(char);
static void tsetscroll(int, int);
+static void tswapscreen(void);
static void ttynew(void);
static void ttyread(void);
@@ -337,13 +339,24 @@ tnew(int col, int row) {
/* set screen size */
term.row = row, term.col = col;
term.line = malloc(term.row * sizeof(Line));
- for(row = 0 ; row < term.row; row++)
+ term.alt = malloc(term.row * sizeof(Line));
+ for(row = 0 ; row < term.row; row++) {
term.line[row] = malloc(term.col * sizeof(Glyph));
+ term.alt [row] = malloc(term.col * sizeof(Glyph));
+ }
/* setup screen */
treset();
}
void
+tswapscreen(void) {
+ Line* tmp = term.line;
+ term.line = term.alt;
+ term.alt = tmp;
+ term.mode ^= MODE_ALTSCREEN;
+}
+
+void
tscrolldown (int n) {
int i;
Line temp;
@@ -712,10 +725,21 @@ csihandle(void) {
case 25:
term.c.state |= CURSOR_HIDE;
break;
- case 1048: /* XXX: no alt. screen to erase/save */
+ case 1047:
+ if(IS_SET(MODE_ALTSCREEN)) {
+ tclearregion(0, 0, term.col-1, term.row-1);
+ tswapscreen();
+ }
+ break;
+ case 1048:
+ tcursor(CURSOR_LOAD);
+ break;
case 1049:
tcursor(CURSOR_LOAD);
- tclearregion(0, 0, term.col-1, term.row-1);
+ if(IS_SET(MODE_ALTSCREEN)) {
+ tclearregion(0, 0, term.col-1, term.row-1);
+ tswapscreen();
+ }
break;
default:
goto unknown;
@@ -761,10 +785,21 @@ csihandle(void) {
case 25:
term.c.state &= ~CURSOR_HIDE;
break;
- case 1048:
- case 1049: /* XXX: no alt. screen to erase/save */
+ case 1047:
+ if(IS_SET(MODE_ALTSCREEN))
+ tclearregion(0, 0, term.col-1, term.row-1);
+ else
+ tswapscreen();
+ break;
+ case 1048:
+ tcursor(CURSOR_SAVE);
+ break;
+ case 1049:
tcursor(CURSOR_SAVE);
- tclearregion(0, 0, term.col-1, term.row-1);
+ if(IS_SET(MODE_ALTSCREEN))
+ tclearregion(0, 0, term.col-1, term.row-1);
+ else
+ tswapscreen();
break;
default: goto unknown;
}
@@ -889,19 +924,19 @@ tputc(char c) {
treset();
term.esc = 0;
break;
- case '=': /* DECPAM */
+ case '=': /* DECPAM -- Application keypad */
term.mode |= MODE_APPKEYPAD;
term.esc = 0;
break;
- case '>': /* DECPNM */
+ case '>': /* DECPNM -- Normal keypad */
term.mode &= ~MODE_APPKEYPAD;
term.esc = 0;
break;
- case '7':
+ case '7': /* DECSC -- Save Cursor*/
tcursor(CURSOR_SAVE);
term.esc = 0;
break;
- case '8':
+ case '8': /* DECRC -- Restore Cursor */
tcursor(CURSOR_LOAD);
term.esc = 0;
break;
@@ -961,21 +996,28 @@ tresize(int col, int row) {
return;
/* free uneeded rows */
- for(i = row; i < term.row; i++)
+ for(i = row; i < term.row; i++) {
free(term.line[i]);
+ free(term.alt[i]);
+ }
/* resize to new height */
term.line = realloc(term.line, row * sizeof(Line));
+ term.line = realloc(term.alt, row * sizeof(Line));
/* resize each row to new width, zero-pad if needed */
for(i = 0; i < minrow; i++) {
term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
+ term.alt[i] = realloc(term.alt[i], col * sizeof(Glyph));
memset(term.line[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
+ memset(term.alt[i] + mincol, 0, (col - mincol) * sizeof(Glyph));
}
/* allocate any new rows */
- for(/* i == minrow */; i < row; i++)
+ for(/* i == minrow */; i < row; i++) {
term.line[i] = calloc(col, sizeof(Glyph));
+ term.alt [i] = calloc(col, sizeof(Glyph));
+ }
/* update terminal size */
term.col = col, term.row = row;