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    commit 9e813947cf4631c0ca8e5f73ebfb269ef2f8252b
    parent b7a7f171effb301ce8dbce07c1c77a6b06ef980f
    Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
    Date:   Sun,  7 Oct 2012 11:06:17 +0200

    Add DEC alignment test

    This sequence was used by DEC personal in to for verifying the screen adjust
    of terminals. It is the unique test sequence implemented by all the
    emulators, and I think it is because they want be conforms with vttest which
    uses this sequence in some tests.
    ---
     st.c |   31 +++++++++++++++++++++++--------
     1 file changed, 23 insertions(+), 8 deletions(-)
    Diffstat:
    Mst.c | 31+++++++++++++++++++++++--------

    1 file changed, 23 insertions(+), 8 deletions(-)
    diff --git a/st.c b/st.c
    @@ -123,6 +123,7 @@ enum escape_state {
     	ESC_STR	= 4, /* DSC, OSC, PM, APC */
     	ESC_ALTCHARSET = 8,
     	ESC_STR_END    = 16, /* a final string was encountered */
    +	ESC_TEST       = 32, /* Enter in test mode */
     };

     enum window_state {
    @@ -289,7 +290,7 @@ static int tresize(int, int);
     static void tscrollup(int, int);
     static void tscrolldown(int, int);
     static void tsetattr(int*, int);
    -static void tsetchar(char*);
    +static void tsetchar(char *, Glyph *, int, int);
     static void tsetscroll(int, int);
     static void tswapscreen(void);
     static void tsetdirt(int, int);
    @@ -1182,7 +1183,7 @@ tmoveto(int x, int y) {
     }

     void
    -tsetchar(char *c) {
    +tsetchar(char *c, Glyph *attr, int x, int y) {
     	static char *vt100_0[62] = { /* 0x41 - 0x7e */
     		"↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
     		0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
    @@ -1197,17 +1198,17 @@ tsetchar(char *c) {
     	/*
     	 * The table is proudly stolen from rxvt.
     	 */
    -	if(term.c.attr.mode & ATTR_GFX) {
    +	if(attr->mode & ATTR_GFX) {
     		if(c[0] >= 0x41 && c[0] <= 0x7e
     				&& vt100_0[c[0] - 0x41]) {
     			c = vt100_0[c[0] - 0x41];
     		}
     	}

    -	term.dirty[term.c.y] = 1;
    -	term.line[term.c.y][term.c.x] = term.c.attr;
    -	memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
    -	term.line[term.c.y][term.c.x].state |= GLYPH_SET;
    +	term.dirty[y] = 1;
    +	term.line[y][x] = *attr;
    +	memcpy(term.line[y][x].c, c, UTF_SIZ);
    +	term.line[y][x].state |= GLYPH_SET;
     }

     void
    @@ -1893,11 +1894,25 @@ tputc(char *c, int len) {
     				fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
     			}
     			term.esc = 0;
    +		} else if(term.esc & ESC_TEST) {
    +			if(ascii == '8') { /* DEC screen alignment test. */
    +				char E[UTF_SIZ] = "E";
    +				int x, y;
    +
    +				for(x = 0; x < term.col; ++x) {
    +					for(y = 0; y < term.row; ++y)
    +						tsetchar(E, &term.c.attr, x, y);
    +				}
    +			}
    +			term.esc = 0;
     		} else {
     			switch(ascii) {
     			case '[':
     				term.esc |= ESC_CSI;
     				break;
    +			case '#':
    +				term.esc |= ESC_TEST;
    +				break;
     			case 'P': /* DCS -- Device Control String */
     			case '_': /* APC -- Application Program Command */
     			case '^': /* PM -- Privacy Message */
    @@ -1988,7 +2003,7 @@ tputc(char *c, int len) {
     		sel.bx = -1;
     	if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
     		tnewline(1); /* always go to first col */
    -	tsetchar(c);
    +	tsetchar(c, &term.c.attr, term.c.x, term.c.y);
     	if(term.c.x+1 < term.col)
     		tmoveto(term.c.x+1, term.c.y);
     	else