Proxmox/vncterm
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fix bound checking on cursor move

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changing most of the vt struct fields to unsigned, to avoid undefined
behaviour and use gotoxy for moving the cursor to correctly bound check
the cursor position

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2017-05-05 14:19:06 +02:00 committed by Dietmar Maurer
parent bdbcef679d
commit 8392857fa7
2 changed files with 11 additions and 23 deletions
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20
vncterm.c
View File

@ -1405,10 +1405,7 @@ vncterm_putchar (vncTerm *vt, unicode ch)
if (vt->esc_buf[0] == 0) {
vt->esc_buf[0] = 1;
}
vt->cy -= vt->esc_buf[0];
if (vt->cy < 0) {
vt->cy = 0;
}
vncterm_gotoxy (vt, vt->cx, vt->cy - vt->esc_buf[0]);
break;
case 'B':
case 'e':
@ -1416,10 +1413,7 @@ vncterm_putchar (vncTerm *vt, unicode ch)
if (vt->esc_buf[0] == 0) {
vt->esc_buf[0] = 1;
}
vt->cy += vt->esc_buf[0];
if (vt->cy >= vt->height) {
vt->cy = vt->height - 1;
}
vncterm_gotoxy (vt, vt->cx, vt->cy + vt->esc_buf[0]);
break;
case 'C':
case 'a':
@ -1427,20 +1421,14 @@ vncterm_putchar (vncTerm *vt, unicode ch)
if (vt->esc_buf[0] == 0) {
vt->esc_buf[0] = 1;
}
vt->cx += vt->esc_buf[0];
if (vt->cx >= vt->width) {
vt->cx = vt->width - 1;
}
vncterm_gotoxy (vt, vt->cx + vt->esc_buf[0], vt->cy);
break;
case 'D':
/* move cursor left */
if (vt->esc_buf[0] == 0) {
vt->esc_buf[0] = 1;
}
vt->cx -= vt->esc_buf[0];
if (vt->cx < 0) {
vt->cx = 0;
}
vncterm_gotoxy (vt, vt->cx - vt->esc_buf[0], vt->cy);
break;
case 'G':
case '`':

14
vncterm.h
View File

@ -48,19 +48,19 @@ typedef struct vncTerm {
// cursor
TextAttributes cur_attrib;
TextAttributes cur_attrib_saved;
int tty_state; // 0 - normal, 1 - ESC, 2 - CSI
unsigned int tty_state; // 0 - normal, 1 - ESC, 2 - CSI
int cx; // cursor x position
int cy; // cursor y position
int cx_saved; // saved cursor x position
int cy_saved; // saved cursor y position
int esc_buf[MAX_ESC_PARAMS];
int esc_count;
int esc_ques;
int esc_has_par;
unsigned int esc_buf[MAX_ESC_PARAMS];
unsigned int esc_count;
unsigned int esc_ques;
unsigned int esc_has_par;
char osc_textbuf[4096];
char osc_cmd;
int region_top;
int region_bottom;
unsigned int region_top;
unsigned int region_bottom;
unsigned int charset:1; // G0 or G1
unsigned int charset_saved:1; // G0 or G1