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/* $Id: screen-write.c,v 1.96 2011/04/18 21:06:49 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <string.h>
#include "tmux.h"
void screen_write_initctx(struct screen_write_ctx *, struct tty_ctx *, int);
void screen_write_overwrite(struct screen_write_ctx *, u_int);
int screen_write_combine(
struct screen_write_ctx *, const struct utf8_data *);
/* Initialise writing with a window. */
void
screen_write_start(
struct screen_write_ctx *ctx, struct window_pane *wp, struct screen *s)
{
ctx->wp = wp;
if (wp != NULL && s == NULL)
ctx->s = wp->screen;
else
ctx->s = s;
}
/* Finish writing. */
/* ARGSUSED */
void
screen_write_stop(unused struct screen_write_ctx *ctx)
{
}
/* Write character. */
void
screen_write_putc(
struct screen_write_ctx *ctx, struct grid_cell *gc, u_char ch)
{
gc->data = ch;
screen_write_cell(ctx, gc, NULL);
}
/* Calculate string length, with embedded formatting. */
size_t printflike2
screen_write_cstrlen(int utf8flag, const char *fmt, ...)
{
va_list ap;
char *msg, *msg2, *ptr, *ptr2;
size_t size;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
msg2 = xmalloc(strlen(msg) + 1);
ptr = msg;
ptr2 = msg2;
while (*ptr != '\0') {
if (ptr[0] == '#' && ptr[1] == '[') {
while (*ptr != ']' && *ptr != '\0')
ptr++;
if (*ptr == ']')
ptr++;
continue;
}
*ptr2++ = *ptr++;
}
*ptr2 = '\0';
size = screen_write_strlen(utf8flag, "%s", msg2);
xfree(msg);
xfree(msg2);
return (size);
}
/* Calculate string length. */
size_t printflike2
screen_write_strlen(int utf8flag, const char *fmt, ...)
{
va_list ap;
char *msg;
struct utf8_data utf8data;
u_char *ptr;
size_t left, size = 0;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
ptr = msg;
while (*ptr != '\0') {
if (utf8flag && *ptr > 0x7f && utf8_open(&utf8data, *ptr)) {
ptr++;
left = strlen(ptr);
if (left < utf8data.size - 1)
break;
while (utf8_append(&utf8data, *ptr))
ptr++;
ptr++;
size += utf8data.width;
} else {
size++;
ptr++;
}
}
xfree(msg);
return (size);
}
/* Write simple string (no UTF-8 or maximum length). */
void printflike3
screen_write_puts(
struct screen_write_ctx *ctx, struct grid_cell *gc, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
screen_write_vnputs(ctx, -1, gc, 0, fmt, ap);
va_end(ap);
}
/* Write string with length limit (-1 for unlimited). */
void printflike5
screen_write_nputs(struct screen_write_ctx *ctx,
ssize_t maxlen, struct grid_cell *gc, int utf8flag, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
screen_write_vnputs(ctx, maxlen, gc, utf8flag, fmt, ap);
va_end(ap);
}
void
screen_write_vnputs(struct screen_write_ctx *ctx, ssize_t maxlen,
struct grid_cell *gc, int utf8flag, const char *fmt, va_list ap)
{
char *msg;
struct utf8_data utf8data;
u_char *ptr;
size_t left, size = 0;
xvasprintf(&msg, fmt, ap);
ptr = msg;
while (*ptr != '\0') {
if (utf8flag && *ptr > 0x7f && utf8_open(&utf8data, *ptr)) {
ptr++;
left = strlen(ptr);
if (left < utf8data.size - 1)
break;
while (utf8_append(&utf8data, *ptr))
ptr++;
ptr++;
if (maxlen > 0 &&
size + utf8data.width > (size_t) maxlen) {
while (size < (size_t) maxlen) {
screen_write_putc(ctx, gc, ' ');
size++;
}
break;
}
size += utf8data.width;
gc->flags |= GRID_FLAG_UTF8;
screen_write_cell(ctx, gc, &utf8data);
gc->flags &= ~GRID_FLAG_UTF8;
} else {
if (maxlen > 0 && size + 1 > (size_t) maxlen)
break;
size++;
screen_write_putc(ctx, gc, *ptr);
ptr++;
}
}
xfree(msg);
}
/* Write string, similar to nputs, but with embedded formatting (#[]). */
void printflike5
screen_write_cnputs(struct screen_write_ctx *ctx,
ssize_t maxlen, struct grid_cell *gc, int utf8flag, const char *fmt, ...)
{
struct grid_cell lgc;
struct utf8_data utf8data;
va_list ap;
char *msg;
u_char *ptr, *last;
size_t left, size = 0;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
memcpy(&lgc, gc, sizeof lgc);
ptr = msg;
while (*ptr != '\0') {
if (ptr[0] == '#' && ptr[1] == '[') {
ptr += 2;
last = ptr + strcspn(ptr, "]");
if (*last == '\0') {
/* No ]. Not much point in doing anything. */
break;
}
*last = '\0';
screen_write_parsestyle(gc, &lgc, ptr);
ptr = last + 1;
continue;
}
if (utf8flag && *ptr > 0x7f && utf8_open(&utf8data, *ptr)) {
ptr++;
left = strlen(ptr);
if (left < utf8data.size - 1)
break;
while (utf8_append(&utf8data, *ptr))
ptr++;
ptr++;
if (maxlen > 0 &&
size + utf8data.width > (size_t) maxlen) {
while (size < (size_t) maxlen) {
screen_write_putc(ctx, gc, ' ');
size++;
}
break;
}
size += utf8data.width;
lgc.flags |= GRID_FLAG_UTF8;
screen_write_cell(ctx, &lgc, &utf8data);
lgc.flags &= ~GRID_FLAG_UTF8;
} else {
if (maxlen > 0 && size + 1 > (size_t) maxlen)
break;
size++;
screen_write_putc(ctx, &lgc, *ptr);
ptr++;
}
}
xfree(msg);
}
/* Parse an embedded style of the form "fg=colour,bg=colour,bright,...". */
void
screen_write_parsestyle(
struct grid_cell *defgc, struct grid_cell *gc, const char *in)
{
const char delimiters[] = " ,";
char tmp[32];
int val;
size_t end;
u_char fg, bg, attr, flags;
if (*in == '\0')
return;
if (strchr(delimiters, in[strlen(in) - 1]) != NULL)
return;
fg = gc->fg;
bg = gc->bg;
attr = gc->attr;
flags = gc->flags;
do {
end = strcspn(in, delimiters);
if (end > (sizeof tmp) - 1)
return;
memcpy(tmp, in, end);
tmp[end] = '\0';
if (strcasecmp(tmp, "default") == 0) {
fg = defgc->fg;
bg = defgc->bg;
attr = defgc->attr;
} else if (end > 3 && strncasecmp(tmp + 1, "g=", 2) == 0) {
if ((val = colour_fromstring(tmp + 3)) == -1)
return;
if (*in == 'f' || *in == 'F') {
if (val != 8) {
if (val & 0x100) {
flags |= GRID_FLAG_FG256;
val &= ~0x100;
} else
flags &= ~GRID_FLAG_FG256;
fg = val;
} else
fg = defgc->fg;
} else if (*in == 'b' || *in == 'B') {
if (val != 8) {
if (val & 0x100) {
flags |= GRID_FLAG_BG256;
val &= ~0x100;
} else
flags &= ~GRID_FLAG_BG256;
bg = val;
} else
bg = defgc->bg;
} else
return;
} else if (end > 2 && strncasecmp(tmp, "no", 2) == 0) {
if ((val = attributes_fromstring(tmp + 2)) == -1)
return;
attr &= ~val;
} else {
if ((val = attributes_fromstring(tmp)) == -1)
return;
attr |= val;
}
in += end + strspn(in + end, delimiters);
} while (*in != '\0');
gc->fg = fg;
gc->bg = bg;
gc->attr = attr;
gc->flags = flags;
}
/* Copy from another screen. */
void
screen_write_copy(struct screen_write_ctx *ctx,
struct screen *src, u_int px, u_int py, u_int nx, u_int ny)
{
struct screen *s = ctx->s;
struct grid *gd = src->grid;
struct grid_line *gl;
const struct grid_cell *gc;
const struct grid_utf8 *gu;
struct utf8_data utf8data;
u_int xx, yy, cx, cy, ax, bx;
cx = s->cx;
cy = s->cy;
for (yy = py; yy < py + ny; yy++) {
gl = &gd->linedata[yy];
if (yy < gd->hsize + gd->sy) {
/*
* Find start and end position and copy between
* them. Limit to the real end of the line then use a
* clear EOL only if copying to the end, otherwise
* could overwrite whatever is there already.
*/
if (px > gl->cellsize)
ax = gl->cellsize;
else
ax = px;
if (px + nx == gd->sx && px + nx > gl->cellsize)
bx = gl->cellsize;
else
bx = px + nx;
for (xx = ax; xx < bx; xx++) {
if (xx >= gl->cellsize)
gc = &grid_default_cell;
else
gc = &gl->celldata[xx];
if (!(gc->flags & GRID_FLAG_UTF8)) {
screen_write_cell(ctx, gc, NULL);
continue;
}
/* Reinject the UTF-8 sequence. */
gu = &gl->utf8data[xx];
utf8data.size = grid_utf8_copy(
gu, utf8data.data, sizeof utf8data.data);
utf8data.width = gu->width;
screen_write_cell(ctx, gc, &utf8data);
}
if (px + nx == gd->sx && px + nx > gl->cellsize)
screen_write_clearendofline(ctx);
} else
screen_write_clearline(ctx);
cy++;
screen_write_cursormove(ctx, cx, cy);
}
}
/* Set up context for TTY command. */
void
screen_write_initctx(
struct screen_write_ctx *ctx, struct tty_ctx *ttyctx, int save_last)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
const struct grid_cell *gc;
const struct grid_utf8 *gu;
u_int xx;
ttyctx->wp = ctx->wp;
ttyctx->ocx = s->cx;
ttyctx->ocy = s->cy;
ttyctx->orlower = s->rlower;
ttyctx->orupper = s->rupper;
if (!save_last)
return;
/* Save the last cell on the screen. */
gc = &grid_default_cell;
for (xx = 1; xx <= screen_size_x(s); xx++) {
gc = grid_view_peek_cell(gd, screen_size_x(s) - xx, s->cy);
if (!(gc->flags & GRID_FLAG_PADDING))
break;
}
ttyctx->last_width = xx;
memcpy(&ttyctx->last_cell, gc, sizeof ttyctx->last_cell);
if (gc->flags & GRID_FLAG_UTF8) {
gu = grid_view_peek_utf8(gd, screen_size_x(s) - xx, s->cy);
memcpy(&ttyctx->last_utf8, gu, sizeof ttyctx->last_utf8);
}
}
/* Cursor up by ny. */
void
screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (s->cy < s->rupper) {
/* Above region. */
if (ny > s->cy)
ny = s->cy;
} else {
/* Below region. */
if (ny > s->cy - s->rupper)
ny = s->cy - s->rupper;
}
if (ny == 0)
return;
s->cy -= ny;
}
/* Cursor down by ny. */
void
screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (s->cy > s->rlower) {
/* Below region. */
if (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
} else {
/* Above region. */
if (ny > s->rlower - s->cy)
ny = s->rlower - s->cy;
}
if (ny == 0)
return;
s->cy += ny;
}
/* Cursor right by nx. */
void
screen_write_cursorright(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - 1 - s->cx)
nx = screen_size_x(s) - 1 - s->cx;
if (nx == 0)
return;
s->cx += nx;
}
/* Cursor left by nx. */
void
screen_write_cursorleft(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
if (nx == 0)
nx = 1;
if (nx > s->cx)
nx = s->cx;
if (nx == 0)
return;
s->cx -= nx;
}
/* Backspace; cursor left unless at start of wrapped line when can move up. */
void
screen_write_backspace(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct grid_line *gl;
if (s->cx == 0) {
if (s->cy == 0)
return;
gl = &s->grid->linedata[s->grid->hsize + s->cy - 1];
if (gl->flags & GRID_LINE_WRAPPED) {
s->cy--;
s->cx = screen_size_x(s) - 1;
}
} else
s->cx--;
}
/* VT100 alignment test. */
void
screen_write_alignmenttest(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
struct grid_cell gc;
u_int xx, yy;
screen_write_initctx(ctx, &ttyctx, 0);
memcpy(&gc, &grid_default_cell, sizeof gc);
gc.data = 'E';
for (yy = 0; yy < screen_size_y(s); yy++) {
for (xx = 0; xx < screen_size_x(s); xx++)
grid_view_set_cell(s->grid, xx, yy, &gc);
}
s->cx = 0;
s->cy = 0;
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
tty_write(tty_cmd_alignmenttest, &ttyctx);
}
/* Insert nx characters. */
void
screen_write_insertcharacter(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - s->cx)
nx = screen_size_x(s) - s->cx;
if (nx == 0)
return;
screen_write_initctx(ctx, &ttyctx, 0);
if (s->cx <= screen_size_x(s) - 1)
grid_view_insert_cells(s->grid, s->cx, s->cy, nx);
ttyctx.num = nx;
tty_write(tty_cmd_insertcharacter, &ttyctx);
}
/* Delete nx characters. */
void
screen_write_deletecharacter(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - s->cx)
nx = screen_size_x(s) - s->cx;
if (nx == 0)
return;
screen_write_initctx(ctx, &ttyctx, 0);
if (s->cx <= screen_size_x(s) - 1)
grid_view_delete_cells(s->grid, s->cx, s->cy, nx);
ttyctx.num = nx;
tty_write(tty_cmd_deletecharacter, &ttyctx);
}
/* Insert ny lines. */
void
screen_write_insertline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (ny == 0)
ny = 1;
if (s->cy < s->rupper || s->cy > s->rlower) {
if (ny > screen_size_y(s) - s->cy)
ny = screen_size_y(s) - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 0);
grid_view_insert_lines(s->grid, s->cy, ny);
ttyctx.num = ny;
tty_write(tty_cmd_insertline, &ttyctx);
return;
}
if (ny > s->rlower + 1 - s->cy)
ny = s->rlower + 1 - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 0);
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_insert_lines(s->grid, s->cy, ny);
else
grid_view_insert_lines_region(s->grid, s->rlower, s->cy, ny);
ttyctx.num = ny;
tty_write(tty_cmd_insertline, &ttyctx);
}
/* Delete ny lines. */
void
screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (ny == 0)
ny = 1;
if (s->cy < s->rupper || s->cy > s->rlower) {
if (ny > screen_size_y(s) - s->cy)
ny = screen_size_y(s) - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 0);
grid_view_delete_lines(s->grid, s->cy, ny);
ttyctx.num = ny;
tty_write(tty_cmd_deleteline, &ttyctx);
return;
}
if (ny > s->rlower + 1 - s->cy)
ny = s->rlower + 1 - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 0);
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_delete_lines(s->grid, s->cy, ny);
else
grid_view_delete_lines_region(s->grid, s->rlower, s->cy, ny);
ttyctx.num = ny;
tty_write(tty_cmd_deleteline, &ttyctx);
}
/* Clear line at cursor. */
void
screen_write_clearline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx, 0);
grid_view_clear(s->grid, 0, s->cy, screen_size_x(s), 1);
tty_write(tty_cmd_clearline, &ttyctx);
}
/* Clear to end of line from cursor. */
void
screen_write_clearendofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx;
screen_write_initctx(ctx, &ttyctx, 0);
sx = screen_size_x(s);
if (s->cx <= sx - 1)
grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1);
tty_write(tty_cmd_clearendofline, &ttyctx);
}
/* Clear to start of line from cursor. */
void
screen_write_clearstartofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx;
screen_write_initctx(ctx, &ttyctx, 0);
sx = screen_size_x(s);
if (s->cx > sx - 1)
grid_view_clear(s->grid, 0, s->cy, sx, 1);
else
grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1);
tty_write(tty_cmd_clearstartofline, &ttyctx);
}
/* Move cursor to px,py. */
void
screen_write_cursormove(struct screen_write_ctx *ctx, u_int px, u_int py)
{
struct screen *s = ctx->s;
if (px > screen_size_x(s) - 1)
px = screen_size_x(s) - 1;
if (py > screen_size_y(s) - 1)
py = screen_size_y(s) - 1;
s->cx = px;
s->cy = py;
}
/* Set cursor mode. */
void
screen_write_cursormode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
if (state)
s->mode |= MODE_CURSOR;
else
s->mode &= ~MODE_CURSOR;
}
/* Reverse index (up with scroll). */
void
screen_write_reverseindex(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx, 0);
if (s->cy == s->rupper)
grid_view_scroll_region_down(s->grid, s->rupper, s->rlower);
else if (s->cy > 0)
s->cy--;
tty_write(tty_cmd_reverseindex, &ttyctx);
}
/* Set scroll region. */
void
screen_write_scrollregion(
struct screen_write_ctx *ctx, u_int rupper, u_int rlower)
{
struct screen *s = ctx->s;
if (rupper > screen_size_y(s) - 1)
rupper = screen_size_y(s) - 1;
if (rlower > screen_size_y(s) - 1)
rlower = screen_size_y(s) - 1;
if (rupper >= rlower) /* cannot be one line */
return;
/* Cursor moves to top-left. */
s->cx = 0;
s->cy = 0;
s->rupper = rupper;
s->rlower = rlower;
}
/* Set insert mode. */
void
screen_write_insertmode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
if (state)
s->mode |= MODE_INSERT;
else
s->mode &= ~MODE_INSERT;
}
/* Set UTF-8 mouse mode. */
void
screen_write_utf8mousemode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
if (state)
s->mode |= MODE_MOUSE_UTF8;
else
s->mode &= ~MODE_MOUSE_UTF8;
}
/* Set mouse mode off. */
void
screen_write_mousemode_off(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
s->mode &= ~ALL_MOUSE_MODES;
}
/* Set mouse mode on. */
void
screen_write_mousemode_on(struct screen_write_ctx *ctx, int mode)
{
struct screen *s = ctx->s;
s->mode &= ~ALL_MOUSE_MODES;
s->mode |= mode;
}
/* Line feed. */
void
screen_write_linefeed(struct screen_write_ctx *ctx, int wrapped)
{
struct screen *s = ctx->s;
struct grid_line *gl;
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx, 0);
gl = &s->grid->linedata[s->grid->hsize + s->cy];
if (wrapped)
gl->flags |= GRID_LINE_WRAPPED;
else
gl->flags &= ~GRID_LINE_WRAPPED;
if (s->cy == s->rlower)
grid_view_scroll_region_up(s->grid, s->rupper, s->rlower);
else if (s->cy < screen_size_y(s) - 1)
s->cy++;
ttyctx.num = wrapped;
tty_write(tty_cmd_linefeed, &ttyctx);
}
/* Carriage return (cursor to start of line). */
void
screen_write_carriagereturn(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
s->cx = 0;
}
/* Set keypad cursor keys mode. */
void
screen_write_kcursormode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
if (state)
s->mode |= MODE_KCURSOR;
else
s->mode &= ~MODE_KCURSOR;
}
/* Set keypad number keys mode. */
void
screen_write_kkeypadmode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
if (state)
s->mode |= MODE_KKEYPAD;
else
s->mode &= ~MODE_KKEYPAD;
}
/* Clear to end of screen from cursor. */
void
screen_write_clearendofscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx, sy;
screen_write_initctx(ctx, &ttyctx, 0);
sx = screen_size_x(s);
sy = screen_size_y(s);
/* Scroll into history if it is enabled and clearing entire screen. */
if (s->cy == 0 && s->grid->flags & GRID_HISTORY)
grid_view_clear_history(s->grid);
else {
if (s->cx <= sx - 1)
grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1);
grid_view_clear(s->grid, 0, s->cy + 1, sx, sy - (s->cy + 1));
}
tty_write(tty_cmd_clearendofscreen, &ttyctx);
}
/* Clear to start of screen. */
void
screen_write_clearstartofscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx;
screen_write_initctx(ctx, &ttyctx, 0);
sx = screen_size_x(s);
if (s->cy > 0)
grid_view_clear(s->grid, 0, 0, sx, s->cy);
if (s->cx > sx - 1)
grid_view_clear(s->grid, 0, s->cy, sx, 1);
else
grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1);
tty_write(tty_cmd_clearstartofscreen, &ttyctx);
}
/* Clear entire screen. */
void
screen_write_clearscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx, 0);
/* Scroll into history if it is enabled. */
if (s->grid->flags & GRID_HISTORY)
grid_view_clear_history(s->grid);
else {
grid_view_clear(
s->grid, 0, 0, screen_size_x(s), screen_size_y(s));
}
tty_write(tty_cmd_clearscreen, &ttyctx);
}
/* Write cell data. */
void
screen_write_cell(struct screen_write_ctx *ctx,
const struct grid_cell *gc, const struct utf8_data *utf8data)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct tty_ctx ttyctx;
struct grid_utf8 gu;
u_int width, xx;
struct grid_cell tmp_gc, *tmp_gcp;
int insert = 0;
/* Ignore padding. */
if (gc->flags & GRID_FLAG_PADDING)
return;
/* Find character width. */
if (gc->flags & GRID_FLAG_UTF8)
width = utf8data->width;
else
width = 1;
/*
* If this is a wide character and there is no room on the screen, for
* the entire character, don't print it.
*/
if (!(s->mode & MODE_WRAP)
&& (width > 1 && (width > screen_size_x(s) ||
(s->cx != screen_size_x(s)
&& s->cx > screen_size_x(s) - width))))
return;
/*
* If the width is zero, combine onto the previous character, if
* there is space.
*/
if (width == 0) {
if (screen_write_combine(ctx, utf8data) == 0) {
screen_write_initctx(ctx, &ttyctx, 0);
tty_write(tty_cmd_utf8character, &ttyctx);
}
return;
}
/* Initialise the redraw context, saving the last cell. */
screen_write_initctx(ctx, &ttyctx, 1);
/* If in insert mode, make space for the cells. */
if (s->mode & MODE_INSERT && s->cx <= screen_size_x(s) - width) {
xx = screen_size_x(s) - s->cx - width;
grid_move_cells(s->grid, s->cx + width, s->cx, s->cy, xx);
insert = 1;
}
/* Check this will fit on the current line and wrap if not. */
if ((s->mode & MODE_WRAP) && s->cx > screen_size_x(s) - width) {
screen_write_linefeed(ctx, 1);
s->cx = 0; /* carriage return */
}
/* Sanity checks. */
if (((s->mode & MODE_WRAP) && s->cx > screen_size_x(s) - width)
|| s->cy > screen_size_y(s) - 1)
return;
/* Handle overwriting of UTF-8 characters. */
screen_write_overwrite(ctx, width);
/*
* If the new character is UTF-8 wide, fill in padding cells. Have
* already ensured there is enough room.
*/
for (xx = s->cx + 1; xx < s->cx + width; xx++) {
tmp_gcp = grid_view_get_cell(gd, xx, s->cy);
if (tmp_gcp != NULL)
tmp_gcp->flags |= GRID_FLAG_PADDING;
}
/* Set the cell. */
grid_view_set_cell(gd, s->cx, s->cy, gc);
if (gc->flags & GRID_FLAG_UTF8) {
/* Construct UTF-8 and write it. */
grid_utf8_set(&gu, utf8data);
grid_view_set_utf8(gd, s->cx, s->cy, &gu);
}
/* Move the cursor. */
s->cx += width;
/* Draw to the screen if necessary. */
if (insert) {
ttyctx.num = width;
tty_write(tty_cmd_insertcharacter, &ttyctx);
}
ttyctx.utf8 = &gu;
if (screen_check_selection(s, s->cx - width, s->cy)) {
memcpy(&tmp_gc, &s->sel.cell, sizeof tmp_gc);
tmp_gc.data = gc->data;
tmp_gc.flags = gc->flags &
~(GRID_FLAG_FG256|GRID_FLAG_BG256);
tmp_gc.flags |= s->sel.cell.flags &
(GRID_FLAG_FG256|GRID_FLAG_BG256);
ttyctx.cell = &tmp_gc;
tty_write(tty_cmd_cell, &ttyctx);
} else {
ttyctx.cell = gc;
tty_write(tty_cmd_cell, &ttyctx);
}
}
/* Combine a UTF-8 zero-width character onto the previous. */
int
screen_write_combine(
struct screen_write_ctx *ctx, const struct utf8_data *utf8data)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_cell *gc;
struct grid_utf8 *gu, tmp_gu;
u_int i;
/* Can't combine if at 0. */
if (s->cx == 0)
return (-1);
/* Empty utf8data is out. */
if (utf8data->size == 0)
fatalx("UTF-8 data empty");
/* Retrieve the previous cell and convert to UTF-8 if not already. */
gc = grid_view_get_cell(gd, s->cx - 1, s->cy);
if (!(gc->flags & GRID_FLAG_UTF8)) {
tmp_gu.data[0] = gc->data;
tmp_gu.data[1] = 0xff;
tmp_gu.width = 1;
grid_view_set_utf8(gd, s->cx - 1, s->cy, &tmp_gu);
gc->flags |= GRID_FLAG_UTF8;
}
/* Append the current cell. */
gu = grid_view_get_utf8(gd, s->cx - 1, s->cy);
if (grid_utf8_append(gu, utf8data) != 0) {
/* Failed: scrap this character and replace with underscores. */
if (gu->width == 1) {
gc->data = '_';
gc->flags &= ~GRID_FLAG_UTF8;
} else {
for (i = 0; i < gu->width && i != sizeof gu->data; i++)
gu->data[i] = '_';
if (i != sizeof gu->data)
gu->data[i] = 0xff;
gu->width = i;
}
}
return (0);
}
/*
* UTF-8 wide characters are a bit of an annoyance. They take up more than one
* cell on the screen, so following cells must not be drawn by marking them as
* padding.
*
* So far, so good. The problem is, when overwriting a padding cell, or a UTF-8
* character, it is necessary to also overwrite any other cells which covered
* by the same character.
*/
void
screen_write_overwrite(struct screen_write_ctx *ctx, u_int width)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
const struct grid_cell *gc;
u_int xx;
gc = grid_view_peek_cell(gd, s->cx, s->cy);
if (gc->flags & GRID_FLAG_PADDING) {
/*
* A padding cell, so clear any following and leading padding
* cells back to the character. Don't overwrite the current
* cell as that happens later anyway.
*/
xx = s->cx + 1;
while (--xx > 0) {
gc = grid_view_peek_cell(gd, xx, s->cy);
if (!(gc->flags & GRID_FLAG_PADDING))
break;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
/* Overwrite the character at the start of this padding. */
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
/*
* Overwrite any padding cells that belong to a UTF-8 character
* we'll be overwriting with the current character.
*/
xx = s->cx + width - 1;
while (++xx < screen_size_x(s)) {
gc = grid_view_peek_cell(gd, xx, s->cy);
if (!(gc->flags & GRID_FLAG_PADDING))
break;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
}
void
screen_write_rawstring(struct screen_write_ctx *ctx, u_char *str, u_int len)
{
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.ptr = str;
ttyctx.num = len;
tty_write(tty_cmd_rawstring, &ttyctx);
}