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Don't die when backspacing off the edge of the screen, reported by David Chisnall..

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This commit is contained in:
Nicholas Marriott
2009-01-06 18:07:57 +00:00
parent 4af8db90e8
commit d7e0ea5cc6
1 changed files with 33 additions and 9 deletions
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42
screen-write.c
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@@ -1,4 +1,4 @@
/* $Id: screen-write.c,v 1.18 2009-01-05 11:04:06 nicm Exp $ */
/* $Id: screen-write.c,v 1.19 2009-01-06 18:07:57 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -131,10 +131,13 @@ screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (ny > s->cy)
ny = s->cy;
if (ny == 0)
ny = 1;
return;
s->cy -= ny;
@@ -148,10 +151,13 @@ screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
if (ny == 0)
ny = 1;
return;
s->cy += ny;
@@ -165,10 +171,13 @@ 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)
nx = 1;
return;
s->cx += nx;
@@ -182,10 +191,13 @@ 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)
nx = 1;
return;
s->cx -= nx;
@@ -198,11 +210,14 @@ void
screen_write_insertcharacter(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)
nx = 1;
return;
grid_view_insert_cells(s->grid, s->cx, s->cy, nx);
@@ -216,10 +231,13 @@ screen_write_deletecharacter(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)
nx = 1;
return;
grid_view_delete_cells(s->grid, s->cx, s->cy, nx);
@@ -233,10 +251,13 @@ screen_write_insertline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
if (ny == 0)
ny = 1;
return;
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_insert_lines(s->grid, s->cy, ny);
@@ -255,10 +276,13 @@ screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
if (ny == 0)
ny = 1;
return;
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_delete_lines(s->grid, s->cy, ny);