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/*
* Copyright (c) 2023-2025 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 <sys/types.h>
#include <sys/cdefs.h>
#include <dev/cons/cons.h>
#include <dev/cons/ansi.h>
#include <string.h>
__always_inline static inline bool
is_valid_color(int c)
{
return c >= '0' && c <= '7';
}
static inline void
ansi_reset(struct ansi_state *statep)
{
memset(statep, 0, sizeof(*statep));
}
/*
* Feed a byte into the ANSI escape sequence
* state machine.
*
* @statep: State machine pointer.
* @c: Byte to feed.
*
* On success, `c' is returned. On failure,
* 0 is returned. Values less than 0 indicate
* success with console attributes updated
* (ANSI_UPDATE_*).
*/
int
ansi_feed(struct ansi_state *statep, char c)
{
/* Standard colors */
static uint32_t colortab[] = {
ANSI_BLACK, ANSI_RED,
ANSI_GREEN, ANSI_YELLOW,
ANSI_BLUE, ANSI_MAGENTA,
ANSI_CYAN, ANSI_WHITE
};
/*
* Handle the control sequence introducer
* bytes.
*/
switch (statep->csi) {
case 0: /* '\033' */
if (c != '\033') {
return 0;
}
statep->csi = 1;
statep->prev = c;
return c;
case 1: /* '[' */
if (c != '[') {
ansi_reset(statep);
return 0;
}
statep->csi = 2;
statep->prev = c;
return c;
}
if (!statep->set_fg && !statep->set_bg) {
/* Reset attributes? */
if (statep->reset_color) {
ansi_reset(statep);
cons_reset_color(&g_root_scr);
return ANSI_UPDATE_COLOR;
}
/* Mark attributes to be reset? */
if (c == '0') {
statep->reset_color = 1;
statep->prev = c;
return c;
}
/* Expect foreground */
if (c != '3') {
ansi_reset(statep);
return 0;
}
statep->set_fg = 1;
statep->prev = c;
return c;
}
if (statep->set_fg && c != ';') {
/* Make sure this is valid */
if (!is_valid_color(c)) {
ansi_reset(statep);
return 0;
}
/* Set the foreground */
statep->fg = colortab[c - '0'];
statep->set_bg = 1;
statep->set_fg = 0;
statep->prev = c;
return c;
}
if (statep->set_bg) {
if (c == ';') {
statep->prev = c;
return c;
}
/* Expect '4' after ';' */
if (statep->prev == ';' && c != '4') {
ansi_reset(statep);
return 0;
}
if (c == 'm') {
cons_update_color(&g_root_scr, statep->fg, statep->bg);
ansi_reset(statep);
return ANSI_UPDATE_COLOR;
}
/* Make sure this is valid */
if (!is_valid_color(c)) {
ansi_reset(statep);
return 0;
}
/* Set the background */
statep->bg = colortab[c - '0'];
statep->prev = c;
return c;
}
ansi_reset(statep);
return 0;
}
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