+ LIMIT(top, 0, term.row-1);
+ LIMIT(bot, 0, term.row-1);
+
+ for (i = top; i <= bot; i++)
+ term.dirty[i] = 1;
+}
+
+void
+tsetdirtattr(int attr)
+{
+ int i, j;
+
+ for (i = 0; i < term.row-1; i++) {
+ for (j = 0; j < term.col-1; j++) {
+ if (term.line[i][j].mode & attr) {
+ tsetdirt(i, i);
+ break;
+ }
+ }
+ }
+}
+
+void
+tfulldirt(void)
+{
+ tsetdirt(0, term.row-1);
+}
+
+void
+tcursor(int mode)
+{
+ static TCursor c[2];
+ int alt = IS_SET(MODE_ALTSCREEN);
+
+ if (mode == CURSOR_SAVE) {
+ c[alt] = term.c;
+ } else if (mode == CURSOR_LOAD) {
+ term.c = c[alt];
+ tmoveto(c[alt].x, c[alt].y);
+ }
+}
+
+void
+treset(void)
+{
+ uint i;
+
+ term.c = (TCursor){{
+ .mode = ATTR_NULL,
+ .fg = defaultfg,
+ .bg = defaultbg
+ }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
+
+ memset(term.tabs, 0, term.col * sizeof(*term.tabs));
+ for (i = tabspaces; i < term.col; i += tabspaces)
+ term.tabs[i] = 1;
+ term.top = 0;
+ term.bot = term.row - 1;
+ term.mode = MODE_WRAP|MODE_UTF8;
+ memset(term.trantbl, CS_USA, sizeof(term.trantbl));
+ term.charset = 0;
+
+ for (i = 0; i < 2; i++) {
+ tmoveto(0, 0);
+ tcursor(CURSOR_SAVE);
+ tclearregion(0, 0, term.col-1, term.row-1);
+ tswapscreen();
+ }
+}
+
+void
+tnew(int col, int row)
+{
+ term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
+ tresize(col, row);
+ treset();
+}
+
+void
+tswapscreen(void)
+{
+ Line *tmp = term.line;
+
+ term.line = term.alt;
+ term.alt = tmp;
+ term.mode ^= MODE_ALTSCREEN;
+ tfulldirt();
+}
+
+void
+tscrolldown(int orig, int n)
+{
+ int i;
+ Line temp;
+
+ LIMIT(n, 0, term.bot-orig+1);
+
+ tsetdirt(orig, term.bot-n);
+ tclearregion(0, term.bot-n+1, term.col-1, term.bot);
+
+ for (i = term.bot; i >= orig+n; i--) {
+ temp = term.line[i];
+ term.line[i] = term.line[i-n];
+ term.line[i-n] = temp;
+ }
+
+ selscroll(orig, n);
+}
+
+void
+tscrollup(int orig, int n)
+{
+ int i;
+ Line temp;
+
+ LIMIT(n, 0, term.bot-orig+1);
+
+ tclearregion(0, orig, term.col-1, orig+n-1);
+ tsetdirt(orig+n, term.bot);
+
+ for (i = orig; i <= term.bot-n; i++) {
+ temp = term.line[i];
+ term.line[i] = term.line[i+n];
+ term.line[i+n] = temp;
+ }
+
+ selscroll(orig, -n);
+}
+
+void
+selscroll(int orig, int n)
+{
+ if (sel.ob.x == -1)
+ return;
+
+ if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {
+ selclear();
+ } else if (BETWEEN(sel.nb.y, orig, term.bot)) {
+ sel.ob.y += n;
+ sel.oe.y += n;
+ if (sel.ob.y < term.top || sel.ob.y > term.bot ||
+ sel.oe.y < term.top || sel.oe.y > term.bot) {
+ selclear();
+ } else {
+ selnormalize();
+ }
+ }
+}
+
+void
+tnewline(int first_col)
+{
+ int y = term.c.y;
+
+ if (y == term.bot) {
+ tscrollup(term.top, 1);
+ } else {
+ y++;
+ }
+ tmoveto(first_col ? 0 : term.c.x, y);
+}
+
+void
+csiparse(void)
+{
+ char *p = csiescseq.buf, *np;
+ long int v;
+
+ csiescseq.narg = 0;
+ if (*p == '?') {
+ csiescseq.priv = 1;
+ p++;
+ }
+
+ csiescseq.buf[csiescseq.len] = '\0';
+ while (p < csiescseq.buf+csiescseq.len) {
+ np = NULL;
+ v = strtol(p, &np, 10);
+ if (np == p)
+ v = 0;
+ if (v == LONG_MAX || v == LONG_MIN)
+ v = -1;
+ csiescseq.arg[csiescseq.narg++] = v;
+ p = np;
+ if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
+ break;
+ p++;
+ }
+ csiescseq.mode[0] = *p++;
+ csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
+}
+
+/* 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;
+ }
+ term.c.state &= ~CURSOR_WRAPNEXT;
+ term.c.x = LIMIT(x, 0, term.col-1);
+ term.c.y = LIMIT(y, miny, maxy);
+}
+
+void
+tsetchar(Rune u, 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 */
+ 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
+ 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
+ "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
+ "", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
+ "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
+ "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
+ };
+
+ /*
+ * The table is proudly stolen from rxvt.
+ */
+ if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
+ BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
+ utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
+
+ if (term.line[y][x].mode & ATTR_WIDE) {
+ if (x+1 < term.col) {
+ term.line[y][x+1].u = ' ';
+ term.line[y][x+1].mode &= ~ATTR_WDUMMY;
+ }
+ } else if (term.line[y][x].mode & ATTR_WDUMMY) {
+ term.line[y][x-1].u = ' ';
+ term.line[y][x-1].mode &= ~ATTR_WIDE;
+ }
+
+ term.dirty[y] = 1;
+ term.line[y][x] = *attr;
+ term.line[y][x].u = u;
+}
+
+void
+tclearregion(int x1, int y1, int x2, int y2)
+{
+ int x, y, temp;
+ Glyph *gp;
+
+ if (x1 > x2)
+ temp = x1, x1 = x2, x2 = temp;
+ if (y1 > y2)
+ temp = y1, y1 = y2, y2 = temp;
+
+ LIMIT(x1, 0, term.col-1);
+ LIMIT(x2, 0, term.col-1);
+ LIMIT(y1, 0, term.row-1);
+ LIMIT(y2, 0, term.row-1);
+
+ for (y = y1; y <= y2; y++) {
+ term.dirty[y] = 1;
+ for (x = x1; x <= x2; x++) {
+ gp = &term.line[y][x];
+ if (selected(x, y))
+ selclear();
+ gp->fg = term.c.attr.fg;
+ gp->bg = term.c.attr.bg;
+ gp->mode = 0;
+ gp->u = ' ';
+ }
+ }
+}
+
+void
+tdeletechar(int n)
+{
+ int dst, src, size;
+ Glyph *line;
+
+ LIMIT(n, 0, term.col - term.c.x);
+
+ dst = term.c.x;
+ src = term.c.x + n;
+ size = term.col - src;
+ line = term.line[term.c.y];
+
+ memmove(&line[dst], &line[src], size * sizeof(Glyph));
+ tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
+}
+
+void
+tinsertblank(int n)
+{
+ int dst, src, size;
+ Glyph *line;
+
+ LIMIT(n, 0, term.col - term.c.x);
+
+ dst = term.c.x + n;
+ src = term.c.x;
+ size = term.col - dst;
+ line = term.line[term.c.y];
+
+ memmove(&line[dst], &line[src], size * sizeof(Glyph));
+ tclearregion(src, term.c.y, dst - 1, term.c.y);
+}
+
+void
+tinsertblankline(int n)
+{
+ if (BETWEEN(term.c.y, term.top, term.bot))
+ tscrolldown(term.c.y, n);
+}
+
+void
+tdeleteline(int n)
+{
+ if (BETWEEN(term.c.y, term.top, term.bot))
+ tscrollup(term.c.y, n);
+}
+
+int32_t
+tdefcolor(int *attr, int *npar, int l)
+{
+ int32_t idx = -1;
+ uint r, g, b;
+
+ switch (attr[*npar + 1]) {
+ case 2: /* direct color in RGB space */
+ if (*npar + 4 >= l) {
+ fprintf(stderr,
+ "erresc(38): Incorrect number of parameters (%d)\n",
+ *npar);
+ break;
+ }
+ r = attr[*npar + 2];
+ g = attr[*npar + 3];
+ b = attr[*npar + 4];
+ *npar += 4;
+ if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
+ fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
+ r, g, b);
+ else
+ idx = TRUECOLOR(r, g, b);
+ break;
+ case 5: /* indexed color */
+ if (*npar + 2 >= l) {
+ fprintf(stderr,
+ "erresc(38): Incorrect number of parameters (%d)\n",
+ *npar);
+ break;
+ }
+ *npar += 2;
+ if (!BETWEEN(attr[*npar], 0, 255))
+ fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
+ else
+ idx = attr[*npar];
+ break;
+ case 0: /* implemented defined (only foreground) */
+ case 1: /* transparent */
+ case 3: /* direct color in CMY space */
+ case 4: /* direct color in CMYK space */
+ default:
+ fprintf(stderr,
+ "erresc(38): gfx attr %d unknown\n", attr[*npar]);
+ break;
+ }
+
+ return idx;
+}
+
+void
+tsetattr(int *attr, int l)
+{
+ int i;
+ int32_t idx;
+
+ for (i = 0; i < l; i++) {
+ switch (attr[i]) {