# st

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    commit 12c25bcea973ced6e3b3b03f05cdb3f45fcd9f7f
    parent 326586ba434fb873ebdb81f385ebe838419a98a7
    Author: Aurélien Aptel <aurelien.aptel@gmail.com>
    Date:   Mon, 30 Aug 2010 16:48:18 +0200

    added support for alternate screen.

    Diffstat:
    Mst.c | 70++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------------

    1 file changed, 56 insertions(+), 14 deletions(-)
    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;