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When I wrote this I somehow forgot that the cursor could helpfully sit at sx 

(one character off the right of the screen), so there are several out-of-bounds issues. Add some additional checking.
pull/1/head
Nicholas Marriott 2009-01-08 21:55:12 +00:00
parent 10c4a6dc33
commit cd8f85c2bd
1 changed files with 24 additions and 12 deletions
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36
screen-write.c
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@ -1,4 +1,4 @@
/* $Id: screen-write.c,v 1.20 2009-01-08 21:22:01 nicm Exp $ */
/* $Id: screen-write.c,v 1.21 2009-01-08 21:55:12 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@ -139,7 +139,6 @@ screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
if (ny == 0)
return;
log_debug("cursor up: %u + %u", s->cy, ny);
s->cy -= ny;
if (ctx->write != NULL)
@ -160,7 +159,6 @@ screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny)
if (ny == 0)
return;
log_debug("cursor down: %u + %u", s->cy, ny);
s->cy += ny;
if (ctx->write != NULL)
@ -181,7 +179,6 @@ screen_write_cursorright(struct screen_write_ctx *ctx, u_int nx)
if (nx == 0)
return;
log_debug("cursor right: %u + %u", s->cx, nx);
s->cx += nx;
if (ctx->write != NULL)
@ -202,7 +199,6 @@ screen_write_cursorleft(struct screen_write_ctx *ctx, u_int nx)
if (nx == 0)
return;
log_debug("cursor left: %u + %u", s->cx, nx);
s->cx -= nx;
if (ctx->write != NULL)
@ -223,7 +219,8 @@ screen_write_insertcharacter(struct screen_write_ctx *ctx, u_int nx)
if (nx == 0)
return;
grid_view_insert_cells(s->grid, s->cx, s->cy, nx);
if (s->cx <= screen_size_x(s) - 1)
grid_view_insert_cells(s->grid, s->cx, s->cy, nx);
if (ctx->write != NULL)
ctx->write(ctx->data, TTY_INSERTCHARACTER, nx);
@ -243,7 +240,8 @@ screen_write_deletecharacter(struct screen_write_ctx *ctx, u_int nx)
if (nx == 0)
return;
grid_view_delete_cells(s->grid, s->cx, s->cy, nx);
if (s->cx <= screen_size_x(s) - 1)
grid_view_delete_cells(s->grid, s->cx, s->cy, nx);
if (ctx->write != NULL)
ctx->write(ctx->data, TTY_DELETECHARACTER, nx);
@ -316,9 +314,13 @@ void
screen_write_clearendofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
u_int sx;
grid_view_clear(s->grid, s->cx, s->cy, screen_size_x(s) - s->cx, 1);
sx = screen_size_x(s);
if (s->cx <= sx - 1)
grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1);
if (ctx->write != NULL)
ctx->write(ctx->data, TTY_CLEARENDOFLINE);
}
@ -328,8 +330,14 @@ void
screen_write_clearstartofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
u_int sx;
grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1);
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);
if (ctx->write != NULL)
ctx->write(ctx->data, TTY_CLEARSTARTOFLINE);
@ -505,7 +513,8 @@ screen_write_clearendofscreen(struct screen_write_ctx *ctx)
sx = screen_size_x(s);
sy = screen_size_y(s);
grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1);
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));
if (ctx->write != NULL)
@ -523,7 +532,10 @@ screen_write_clearstartofscreen(struct screen_write_ctx *ctx)
if (s->cy > 0)
grid_view_clear(s->grid, 0, 0, sx, s->cy - 1);
grid_view_clear(s->grid, 0, s->cy, s->cx, 1);
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);
if (ctx->write != NULL)
ctx->write(ctx->data, TTY_CLEARSTARTOFSCREEN);
@ -563,7 +575,7 @@ screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
}
/* Check this will fit on the current line; scroll if not. */
if (s->cx >= screen_size_x(s) + 1 - width) {
if (s->cx > screen_size_x(s) - width) {
screen_write_carriagereturn(ctx);
screen_write_linefeed(ctx);
}