# st

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    commit 5260a9ea2249b9159c188a6e27a39a38d131e411
    parent ee3e0a9fd032bb35eea5c46fc0a9efcd6a80579a
    Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
    Date:   Thu,  8 Nov 2012 17:21:10 +0100

    Add DECOM sequence

    DECOM sequence allows to the user defines a new home position. The home
    position is used as base for all the movement commands except HVP and
    VPA. It is important notice than DECSLM moves cursor to absolute position
    0,0.
    ---
     st.c |   33 ++++++++++++++++++++++++++-------
     1 file changed, 26 insertions(+), 7 deletions(-)
    Diffstat:
    Mst.c | 33++++++++++++++++++++++++++-------

    1 file changed, 26 insertions(+), 7 deletions(-)
    diff --git a/st.c b/st.c
    @@ -97,6 +97,7 @@ enum cursor_movement {
     enum cursor_state {
     	CURSOR_DEFAULT  = 0,
     	CURSOR_WRAPNEXT = 1,
    +	CURSOR_ORIGIN	= 2
     };

     enum glyph_state {
    @@ -300,6 +301,7 @@ static void tdeleteline(int);
     static void tinsertblank(int);
     static void tinsertblankline(int);
     static void tmoveto(int, int);
    +static void tmoveato(int x, int y);
     static void tnew(int, int);
     static void tnewline(int);
     static void tputtab(bool);
    @@ -1211,10 +1213,25 @@ csiparse(void) {
     	}
     }

    +/* for absolute user moves, when decom is set */
    +void
    +tmoveato(int x, int y) {
    +	tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
    +}
    +
     void
     tmoveto(int x, int y) {
    +	int miny, maxy;
    +
    +	if(term.c.state & CURSOR_ORIGIN) {
    +		miny = term.top;
    +		maxy = term.bot;
    +	} else {
    +		miny = 0;
    +		maxy = term.row - 1;
    +	}
     	LIMIT(x, 0, term.col-1);
    -	LIMIT(y, 0, term.row-1);
    +	LIMIT(y, miny, maxy);
     	term.c.state &= ~CURSOR_WRAPNEXT;
     	term.c.x = x;
     	term.c.y = y;
    @@ -1456,7 +1473,9 @@ tsetmode(bool priv, bool set, int *args, int narg) {
     				if(mode != term.mode)
     					redraw();
     				break;
    -			case 6: /* XXX: DECOM -- Origin */
    +			case 6: /* DECOM -- Origin */
    +				MODBIT(term.c.state, set, CURSOR_ORIGIN);
    +				tmoveato(0, 0);
     				break;
     			case 7: /* DECAWM -- Auto wrap */
     				MODBIT(term.mode, set, MODE_WRAP);
    @@ -1593,7 +1612,7 @@ csihandle(void) {
     	case 'f': /* HVP */
     		DEFAULT(csiescseq.arg[0], 1);
     		DEFAULT(csiescseq.arg[1], 1);
    -		tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
    +		tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
     		break;
     	case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
     		DEFAULT(csiescseq.arg[0], 1);
    @@ -1667,7 +1686,7 @@ csihandle(void) {
     		break;
     	case 'd': /* VPA -- Move to <row> */
     		DEFAULT(csiescseq.arg[0], 1);
    -		tmoveto(term.c.x, csiescseq.arg[0]-1);
    +		tmoveato(term.c.x, csiescseq.arg[0]-1);
     		break;
     	case 'h': /* SM -- Set terminal mode */
     		tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
    @@ -1682,7 +1701,7 @@ csihandle(void) {
     			DEFAULT(csiescseq.arg[0], 1);
     			DEFAULT(csiescseq.arg[1], term.row);
     			tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
    -			tmoveto(0, 0);
    +			tmoveato(0, 0);
     		}
     		break;
     	case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
    @@ -2119,10 +2138,10 @@ tresize(int col, int row) {
     	/* update terminal size */
     	term.col = col;
     	term.row = row;
    -	/* make use of the LIMIT in tmoveto */
    -	tmoveto(term.c.x, term.c.y);
     	/* reset scrolling region */
     	tsetscroll(0, row-1);
    +	/* make use of the LIMIT in tmoveto */
    +	tmoveto(term.c.x, term.c.y);

     	return (slide > 0);
     }