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Atmosphere/fusee/fusee-secondary/src/console.c

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "console.h"
#include "di.h"
#include "../../../fusee/common/display/video_fb.h"
static void *g_framebuffer = NULL;
static bool g_display_initialized = false;
static ssize_t console_write(struct _reent *r, void *fd, const char *ptr, size_t len);
static void console_init_display(void);
static const devoptab_t dotab_stdout = {
.name = "con",
.write_r = console_write,
};
/* https://github.com/switchbrew/libnx/blob/master/nx/source/runtime/util/utf/decode_utf8.c */
static ssize_t decode_utf8(uint32_t *out, const uint8_t *in) {
uint8_t code1, code2, code3, code4;
code1 = *in++;
if(code1 < 0x80) {
/* 1-byte sequence */
*out = code1;
return 1;
} else if(code1 < 0xC2) {
return -1;
} else if(code1 < 0xE0) {
/* 2-byte sequence */
code2 = *in++;
if((code2 & 0xC0) != 0x80) {
return -1;
}
*out = (code1 << 6) + code2 - 0x3080;
return 2;
} else if(code1 < 0xF0) {
/* 3-byte sequence */
code2 = *in++;
if((code2 & 0xC0) != 0x80) {
return -1;
}
if(code1 == 0xE0 && code2 < 0xA0) {
return -1;
}
code3 = *in++;
if((code3 & 0xC0) != 0x80) {
return -1;
}
*out = (code1 << 12) + (code2 << 6) + code3 - 0xE2080;
return 3;
} else if(code1 < 0xF5) {
/* 4-byte sequence */
code2 = *in++;
if((code2 & 0xC0) != 0x80) {
return -1;
}
if(code1 == 0xF0 && code2 < 0x90) {
return -1;
}
if(code1 == 0xF4 && code2 >= 0x90) {
return -1;
}
code3 = *in++;
if((code3 & 0xC0) != 0x80) {
return -1;
}
code4 = *in++;
if((code4 & 0xC0) != 0x80) {
return -1;
}
*out = (code1 << 18) + (code2 << 12) + (code3 << 6) + code4 - 0x3C82080;
return 4;
}
return -1;
}
static void console_init_display(void) {
/* Initialize the display. */
display_init();
/* Set the framebuffer. */
display_init_framebuffer(g_framebuffer);
/* Turn on the backlight after initializing the lfb */
/* to avoid flickering. */
display_backlight(true);
/* Display is initialized. */
g_display_initialized = true;
}
static ssize_t console_write(struct _reent *r, void *fd, const char *ptr, size_t len) {
size_t i = 0;
if (!g_display_initialized && (g_framebuffer != NULL)) {
console_init_display();
}
while (i < len) {
uint32_t chr;
ssize_t n = decode_utf8(&chr, (uint8_t *)(ptr + i));
if (n == -1) {
break;
} else {
i += (size_t)n;
video_putc(chr > 0xFF ? '?' : (char)chr);
}
}
return i;
}
static int console_create(void) {
if (g_framebuffer != NULL) {
errno = EEXIST;
return -1;
}
/* Allocate memory for the framebuffer. */
g_framebuffer = memalign(0x1000, CONFIG_VIDEO_VISIBLE_ROWS * CONFIG_VIDEO_COLS * CONFIG_VIDEO_PIXEL_SIZE);
if (g_framebuffer == NULL) {
errno = ENOMEM;
return -1;
}
devoptab_list[STD_OUT] = &dotab_stdout;
devoptab_list[STD_ERR] = &dotab_stdout;
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setvbuf(stdout, NULL , _IOLBF, 4096);
setvbuf(stderr, NULL , _IONBF, 0);
return 0;
}
int console_init(void) {
if (console_create() == -1) {
return -1;
}
/* Zero-fill the framebuffer, etc. */
if (video_init(g_framebuffer) == -1) {
errno = EIO;
console_end();
return -1;
}
return 0;
}
void *console_get_framebuffer(void) {
if (!g_display_initialized && (g_framebuffer != NULL)) {
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console_init_display();
}
return g_framebuffer;
}
int console_display(const void *framebuffer) {
if (!g_display_initialized && (g_framebuffer != NULL)) {
console_init_display();
}
display_init_framebuffer((void *)framebuffer);
return 0;
}
int console_resume(void) {
if (!g_display_initialized && (g_framebuffer != NULL)) {
console_init_display();
} else {
display_init_framebuffer(g_framebuffer);
}
return 0;
}
int console_end(void) {
if (g_display_initialized) {
/* Turn off the backlight. */
display_backlight(false);
/* Terminate the display. */
display_end();
/* Display is terminated. */
g_display_initialized = false;
}
free(g_framebuffer);
g_framebuffer = NULL;
return 0;
}