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/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* 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.
* 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.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/
#include <dev/vcons/vcons_io.h>
#include <dev/vcons/vcons.h>
#include <sys/cdefs.h>
#include <sys/ascii.h>
static void
vcons_expand_tab(struct vcons_screen *scr)
{
for (size_t i = 0; i < VCONS_TAB_WIDTH; ++i) {
vcons_putch(scr, ' ');
}
}
/*
* This routine tries to process the output `c'.
*
* Returns < 0 value on failure. Values >= 0
* is `c' which may differ from the original.
*
* This routine also may modify the screen state
* if `c' is a control character.
*/
int
vcons_process_output(struct vcons_screen *scr, int c)
{
struct vcons_cursor *cursor = &scr->cursor;
switch (c) {
case ASCII_LF:
scr->cpy_y++;
cursor->ypos += FONT_HEIGHT;
scr->cpy_x = 0;
cursor->xpos = 0;
break;
case ASCII_CR:
scr->cpy_x = 0;
cursor->xpos = 0;
break;
case ASCII_HT:
vcons_expand_tab(scr);
break;
case ASCII_BS:
if (cursor->xpos > 0) {
scr->cpy_x--;
cursor->xpos -= FONT_WIDTH;
}
break;
default:
return -1;
}
vcons_update_cursor(scr);
return c;
}
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