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freebsd-dev/sys/dev/syscons/sctermvar.h
Robert Drehmel 47e40520dd Do not try to work around ``poor (un)sign extension code'' 
creation by GCC-2.6.3.  Casting pointers to unsigned char
to volatile pointers to unsigned char seemed to produce
better results on the ia32 architecture with old versions
of GCC.
The current FreeBSD system compiler GCC-3.2.1 emits
better sign extension code for non-volatile variables:

volatile char c;
int i = c;

is compiled to:
...
movb	-1(%ebp), %al
movbsl	%al, %eax
movl	%eax, -8(%ebp)
...

char c;
int i = c;

is compiled to:
...
movbsl	-1(%ebp), %eax
movl	%eax, -8(%ebp)
...

The same holds for zero-extension of dereferenced pointers
to volatile unsigned char.
When compiled on alpha or sparc64, the code produced for the
two examples above does not differ.
2002-10-20 22:50:13 +00:00

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/*-
* Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer as
* the first lines of this file unmodified.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _DEV_SYSCONS_SCTERMVAR_H_
#define _DEV_SYSCONS_SCTERMVAR_H_
/*
* building blocks for terminal emulator modules.
*/
static __inline void sc_term_ins_line(scr_stat *scp, int y, int n, int ch,
int attr, int tail);
static __inline void sc_term_del_line(scr_stat *scp, int y, int n, int ch,
int attr, int tail);
static __inline void sc_term_ins_char(scr_stat *scp, int n, int ch,
int attr);
static __inline void sc_term_del_char(scr_stat *scp, int n, int ch,
int attr);
static __inline void sc_term_col(scr_stat *scp, int n);
static __inline void sc_term_row(scr_stat *scp, int n);
static __inline void sc_term_up(scr_stat *scp, int n, int head);
static __inline void sc_term_down(scr_stat *scp, int n, int tail);
static __inline void sc_term_left(scr_stat *scp, int n);
static __inline void sc_term_right(scr_stat *scp, int n);
static __inline void sc_term_up_scroll(scr_stat *scp, int n, int ch,
int attr, int head, int tail);
static __inline void sc_term_down_scroll(scr_stat *scp, int n, int ch,
int attr, int head, int tail);
static __inline void sc_term_clr_eos(scr_stat *scp, int n, int ch, int attr);
static __inline void sc_term_clr_eol(scr_stat *scp, int n, int ch, int attr);
static __inline void sc_term_tab(scr_stat *scp, int n);
static __inline void sc_term_backtab(scr_stat *scp, int n);
static __inline void sc_term_respond(scr_stat *scp, u_char *s);
static __inline void sc_term_gen_print(scr_stat *scp, u_char **buf, int *len,
int attr);
static __inline void sc_term_gen_scroll(scr_stat *scp, int ch, int attr);
static __inline void
sc_term_ins_line(scr_stat *scp, int y, int n, int ch, int attr, int tail)
{
if (tail <= 0)
tail = scp->ysize;
if (n < 1)
n = 1;
if (n > tail - y)
n = tail - y;
sc_vtb_ins(&scp->vtb, y*scp->xsize, n*scp->xsize, ch, attr);
mark_for_update(scp, y*scp->xsize);
mark_for_update(scp, scp->xsize*tail - 1);
}
static __inline void
sc_term_del_line(scr_stat *scp, int y, int n, int ch, int attr, int tail)
{
if (tail <= 0)
tail = scp->ysize;
if (n < 1)
n = 1;
if (n > tail - y)
n = tail - y;
sc_vtb_delete(&scp->vtb, y*scp->xsize, n*scp->xsize, ch, attr);
mark_for_update(scp, y*scp->xsize);
mark_for_update(scp, scp->xsize*tail - 1);
}
static __inline void
sc_term_ins_char(scr_stat *scp, int n, int ch, int attr)
{
int count;
if (n < 1)
n = 1;
if (n > scp->xsize - scp->xpos)
n = scp->xsize - scp->xpos;
count = scp->xsize - (scp->xpos + n);
sc_vtb_move(&scp->vtb, scp->cursor_pos, scp->cursor_pos + n, count);
sc_vtb_erase(&scp->vtb, scp->cursor_pos, n, ch, attr);
mark_for_update(scp, scp->cursor_pos);
mark_for_update(scp, scp->cursor_pos + n + count - 1);
}
static __inline void
sc_term_del_char(scr_stat *scp, int n, int ch, int attr)
{
int count;
if (n < 1)
n = 1;
if (n > scp->xsize - scp->xpos)
n = scp->xsize - scp->xpos;
count = scp->xsize - (scp->xpos + n);
sc_vtb_move(&scp->vtb, scp->cursor_pos + n, scp->cursor_pos, count);
sc_vtb_erase(&scp->vtb, scp->cursor_pos + count, n, ch, attr);
mark_for_update(scp, scp->cursor_pos);
mark_for_update(scp, scp->cursor_pos + n + count - 1);
}
static __inline void
sc_term_col(scr_stat *scp, int n)
{
if (n < 1)
n = 1;
sc_move_cursor(scp, n - 1, scp->ypos);
}
static __inline void
sc_term_row(scr_stat *scp, int n)
{
if (n < 1)
n = 1;
sc_move_cursor(scp, scp->xpos, n - 1);
}
static __inline void
sc_term_up(scr_stat *scp, int n, int head)
{
if (n < 1)
n = 1;
n = imin(n, scp->ypos - head);
if (n <= 0)
return;
sc_move_cursor(scp, scp->xpos, scp->ypos - n);
}
static __inline void
sc_term_down(scr_stat *scp, int n, int tail)
{
if (tail <= 0)
tail = scp->ysize;
if (n < 1)
n = 1;
n = imin(n, tail - scp->ypos - 1);
if (n <= 0)
return;
sc_move_cursor(scp, scp->xpos, scp->ypos + n);
}
static __inline void
sc_term_left(scr_stat *scp, int n)
{
if (n < 1)
n = 1;
sc_move_cursor(scp, scp->xpos - n, scp->ypos);
}
static __inline void
sc_term_right(scr_stat *scp, int n)
{
if (n < 1)
n = 1;
sc_move_cursor(scp, scp->xpos + n, scp->ypos);
}
static __inline void
sc_term_up_scroll(scr_stat *scp, int n, int ch, int attr, int head, int tail)
{
if (tail <= 0)
tail = scp->ysize;
if (n < 1)
n = 1;
if (n <= scp->ypos - head) {
sc_move_cursor(scp, scp->xpos, scp->ypos - n);
} else {
sc_term_ins_line(scp, head, n - (scp->ypos - head),
ch, attr, tail);
sc_move_cursor(scp, scp->xpos, head);
}
}
static __inline void
sc_term_down_scroll(scr_stat *scp, int n, int ch, int attr, int head, int tail)
{
if (tail <= 0)
tail = scp->ysize;
if (n < 1)
n = 1;
if (n < tail - scp->ypos) {
sc_move_cursor(scp, scp->xpos, scp->ypos + n);
} else {
sc_term_del_line(scp, head, n - (tail - scp->ypos) + 1,
ch, attr, tail);
sc_move_cursor(scp, scp->xpos, tail - 1);
}
}
static __inline void
sc_term_clr_eos(scr_stat *scp, int n, int ch, int attr)
{
switch (n) {
case 0: /* clear form cursor to end of display */
sc_vtb_erase(&scp->vtb, scp->cursor_pos,
scp->xsize*scp->ysize - scp->cursor_pos,
ch, attr);
mark_for_update(scp, scp->cursor_pos);
mark_for_update(scp, scp->xsize*scp->ysize - 1);
sc_remove_cutmarking(scp);
break;
case 1: /* clear from beginning of display to cursor */
sc_vtb_erase(&scp->vtb, 0, scp->cursor_pos + 1, ch, attr);
mark_for_update(scp, 0);
mark_for_update(scp, scp->cursor_pos);
sc_remove_cutmarking(scp);
break;
case 2: /* clear entire display */
sc_vtb_erase(&scp->vtb, 0, scp->xsize*scp->ysize, ch, attr);
mark_for_update(scp, 0);
mark_for_update(scp, scp->xsize*scp->ysize - 1);
sc_remove_cutmarking(scp);
break;
}
}
static __inline void
sc_term_clr_eol(scr_stat *scp, int n, int ch, int attr)
{
switch (n) {
case 0: /* clear form cursor to end of line */
sc_vtb_erase(&scp->vtb, scp->cursor_pos,
scp->xsize - scp->xpos, ch, attr);
mark_for_update(scp, scp->cursor_pos);
mark_for_update(scp, scp->cursor_pos +
scp->xsize - 1 - scp->xpos);
break;
case 1: /* clear from beginning of line to cursor */
sc_vtb_erase(&scp->vtb, scp->cursor_pos - scp->xpos,
scp->xpos + 1, ch, attr);
mark_for_update(scp, scp->ypos*scp->xsize);
mark_for_update(scp, scp->cursor_pos);
break;
case 2: /* clear entire line */
sc_vtb_erase(&scp->vtb, scp->cursor_pos - scp->xpos,
scp->xsize, ch, attr);
mark_for_update(scp, scp->ypos*scp->xsize);
mark_for_update(scp, (scp->ypos + 1)*scp->xsize - 1);
break;
}
}
static __inline void
sc_term_tab(scr_stat *scp, int n)
{
int i;
if (n < 1)
n = 1;
i = (scp->xpos & ~7) + 8*n;
if (i >= scp->xsize) {
if (scp->ypos >= scp->ysize - 1) {
scp->xpos = 0;
scp->ypos++;
scp->cursor_pos = scp->ypos*scp->xsize;
} else
sc_move_cursor(scp, 0, scp->ypos + 1);
} else
sc_move_cursor(scp, i, scp->ypos);
}
static __inline void
sc_term_backtab(scr_stat *scp, int n)
{
int i;
if (n < 1)
n = 1;
if ((i = scp->xpos & ~7) == scp->xpos)
i -= 8*n;
else
i -= 8*(n - 1);
if (i < 0)
i = 0;
sc_move_cursor(scp, i, scp->ypos);
}
static __inline void
sc_term_respond(scr_stat *scp, u_char *s)
{
sc_paste(scp, s, strlen(s)); /* XXX: not correct, don't use rmap */
}
static __inline void
sc_term_gen_print(scr_stat *scp, u_char **buf, int *len, int attr)
{
vm_offset_t p;
u_char *ptr;
u_char *map;
int cnt;
int l;
int i;
ptr = *buf;
l = *len;
if (PRINTABLE(*ptr)) {
p = sc_vtb_pointer(&scp->vtb, scp->cursor_pos);
map = scp->sc->scr_map;
cnt = imin(l, scp->xsize - scp->xpos);
i = cnt;
do {
p = sc_vtb_putchar(&scp->vtb, p, map[*ptr], attr);
++ptr;
--i;
} while ((i > 0) && PRINTABLE(*ptr));
l -= cnt - i;
mark_for_update(scp, scp->cursor_pos);
scp->cursor_pos += cnt - i;
mark_for_update(scp, scp->cursor_pos - 1);
scp->xpos += cnt - i;
if (scp->xpos >= scp->xsize) {
scp->xpos = 0;
scp->ypos++;
/* we may have to scroll the screen */
}
} else {
switch(*ptr) {
case 0x07:
sc_bell(scp, scp->bell_pitch, scp->bell_duration);
break;
case 0x08: /* non-destructive backspace */
/* XXX */
if (scp->cursor_pos > 0) {
#if 0
mark_for_update(scp, scp->cursor_pos);
scp->cursor_pos--;
mark_for_update(scp, scp->cursor_pos);
#else
scp->cursor_pos--;
#endif
if (scp->xpos > 0) {
scp->xpos--;
} else {
scp->xpos += scp->xsize - 1;
scp->ypos--;
}
}
break;
case 0x09: /* non-destructive tab */
sc_term_tab(scp, 1);
/* we may have to scroll the screen */
#if 0
mark_for_update(scp, scp->cursor_pos);
scp->cursor_pos += (8 - scp->xpos % 8u);
mark_for_update(scp, scp->cursor_pos);
scp->xpos += (8 - scp->xpos % 8u);
if (scp->xpos >= scp->xsize) {
scp->xpos = 0;
scp->ypos++;
}
#endif
break;
case 0x0a: /* newline, same pos */
#if 0
mark_for_update(scp, scp->cursor_pos);
scp->cursor_pos += scp->xsize;
mark_for_update(scp, scp->cursor_pos);
#else
scp->cursor_pos += scp->xsize;
/* we may have to scroll the screen */
#endif
scp->ypos++;
break;
case 0x0c: /* form feed, clears screen */
sc_clear_screen(scp);
break;
case 0x0d: /* return, return to pos 0 */
#if 0
mark_for_update(scp, scp->cursor_pos);
scp->cursor_pos -= scp->xpos;
mark_for_update(scp, scp->cursor_pos);
#else
scp->cursor_pos -= scp->xpos;
#endif
scp->xpos = 0;
break;
}
ptr++; l--;
}
*buf = ptr;
*len = l;
}
static __inline void
sc_term_gen_scroll(scr_stat *scp, int ch, int attr)
{
/* do we have to scroll ?? */
if (scp->cursor_pos >= scp->ysize*scp->xsize) {
sc_remove_cutmarking(scp); /* XXX */
#ifndef SC_NO_HISTORY
if (scp->history != NULL)
sc_hist_save_one_line(scp, 0); /* XXX */
#endif
sc_vtb_delete(&scp->vtb, 0, scp->xsize, ch, attr);
scp->cursor_pos -= scp->xsize;
scp->ypos--;
mark_all(scp);
}
}
#endif /* _DEV_SYSCONS_SCTERMVAR_H_ */
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