source: mainline/uspace/lib/libc/generic/console.c@ 2ac85ba

/*
 * Copyright (c) 2006 Josef Cejka
 * Copyright (c) 2006 Jakub Vana
 * Copyright (c) 2008 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */

#include <libc.h>
#include <async.h>
#include <io/stream.h>
#include <ipc/console.h>
#include <ipc/services.h>
#include <errno.h>
#include <string.h>
#include <console.h>

static int console_phone = -1;

/** Size of cbuffer. */
#define CBUFFER_SIZE  256

/** Buffer for writing characters to the console. */
static char cbuffer[CBUFFER_SIZE];

/** Pointer to end of cbuffer. */
static char *cbuffer_end = cbuffer + CBUFFER_SIZE;

/** Pointer to first available field in cbuffer. */
static char *cbp = cbuffer;


/** Write one character to the console via IPC. */
static void cons_putchar(wchar_t c)
{
        console_wait();
        async_msg_1(console_phone, CONSOLE_PUTCHAR, c);
}

/** Write characters to the console via IPC or to klog */
static ssize_t cons_write(const char *buf, size_t size)
{
        console_open(false);
        
        if (console_phone >= 0) {
                async_serialize_start();
                
                ipc_call_t answer;
                aid_t req = async_send_0(console_phone, CONSOLE_WRITE, &answer);
                ipcarg_t rc = ipc_data_write_start(console_phone, (void *) buf, size);
                
                if (rc != EOK) {
                        async_wait_for(req, NULL);
                        async_serialize_end();
                        return (ssize_t) rc;
                }
                
                async_wait_for(req, &rc);
                async_serialize_end();
                
                if (rc == EOK)
                        return (ssize_t) IPC_GET_ARG1(answer);
                else
                        return -1;
        } else
                return __SYSCALL3(SYS_KLOG, 1, (sysarg_t) buf, size);
}

/** Write all data from output buffer to the console. */
static void cbuffer_flush(void)
{
        size_t len = cbp - cbuffer;
        
        while (len > 0) {
                ssize_t rc = cons_write(cbuffer, cbp - cbuffer);
                if (rc < 0)
                        return;
                
                len -= rc;
        }
        
        cbp = cbuffer;
}

/** Drop all data in console output buffer. */
static void cbuffer_drain(void)
{
        cbp = cbuffer;
}

/** Write one character to the output buffer. */
static inline void cbuffer_putc(char c)
{
        if (cbp == cbuffer_end)
                cbuffer_flush();
        
        *cbp++ = c;
        
        if (c == '\n')
                cbuffer_flush();
}

int console_open(bool blocking)
{
        if (console_phone < 0) {
                int phone;
                
                if (blocking)
                        phone = ipc_connect_me_to_blocking(PHONE_NS,
                            SERVICE_CONSOLE, 0, 0);
                else
                        phone = ipc_connect_me_to(PHONE_NS,
                            SERVICE_CONSOLE, 0, 0);
                
                if (phone >= 0)
                        console_phone = phone;
        }
        
        return console_phone;
}

void console_close(void)
{
        if (console_phone >= 0) {
                if (ipc_hangup(console_phone) == 0)
                        console_phone = -1;
        }
}

void console_wait(void)
{
        while (console_phone < 0)
                console_open(true);
}

void console_clear(void)
{
        console_wait();
        cbuffer_drain();
        async_msg_0(console_phone, CONSOLE_CLEAR);
}

int console_get_size(int *rows, int *cols)
{
        console_wait();
        
        ipcarg_t r;
        ipcarg_t c;
        int rc = async_req_0_2(console_phone, CONSOLE_GETSIZE, &r, &c);
        
        *rows = (int) r;
        *cols = (int) c;
        
        return rc;
}

void console_set_style(int style)
{
        console_wait();
        cbuffer_flush();
        async_msg_1(console_phone, CONSOLE_SET_STYLE, style);
}

void console_set_color(int fg_color, int bg_color, int flags)
{
        console_wait();
        cbuffer_flush();
        async_msg_3(console_phone, CONSOLE_SET_COLOR, fg_color, bg_color, flags);
}

void console_set_rgb_color(int fg_color, int bg_color)
{
        console_wait();
        cbuffer_flush();
        async_msg_2(console_phone, CONSOLE_SET_RGB_COLOR, fg_color, bg_color);
}

void console_cursor_visibility(int show)
{
        console_wait();
        cbuffer_flush();
        async_msg_1(console_phone, CONSOLE_CURSOR_VISIBILITY, show != 0);
}

void console_kcon_enable(void)
{
        console_wait();
        cbuffer_flush();
        async_msg_0(console_phone, CONSOLE_KCON_ENABLE);
}

void console_goto(int row, int col)
{
        console_wait();
        cbuffer_flush();
        async_msg_2(console_phone, CONSOLE_GOTO, row, col);
}

void console_putchar(wchar_t c)
{
        console_wait();
        cbuffer_flush();
        cons_putchar(c);
}

/** Write characters to the console. */
ssize_t console_write(const char *buf, size_t size)
{
        size_t left = size;
        
        while (left > 0) {
                cbuffer_putc(*buf++);
                left--;
        }
        
        return size;
}

/** Write a NULL-terminated string to the console. */
void console_putstr(const char *str)
{
        size_t left = str_size(str);
        
        while (left > 0) {
                ssize_t rc = console_write(str, left);
                
                if (rc < 0) {
                        /* Error */
                        return;
                }
                
                str += rc;
                left -= rc;
        }
}

/** Flush all output to the console or klog. */
void console_flush(void)
{
        cbuffer_flush();
        if (console_phone >= 0)
                async_msg_0(console_phone, CONSOLE_FLUSH);
}

/** @}
 */