source: trunk/hal/x86_64/x86_printf.c @ 31

/*
 * x86_printf.c - A printf function for x86 (debug only).
 *
 * Copyright (c) [don't know exactly, found on the internet... anyway, this
 *                file will be removed soon...]
 *
 * This file is part of ALMOS-MKH.
 *
 * ALMOS-MKH is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.0 of the License.
 *
 * ALMOS-MKH is distributed in the hope that 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 ALMOS-MKH.; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <hal_types.h>
#include <hal_boot.h>

#include <memcpy.h>
#include <thread.h>
#include <string.h>
#include <process.h>
#include <printk.h>
#include <vmm.h>
#include <core.h>
#include <cluster.h>

#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
#define CONS_X_SIZE     160
#define CONS_Y_SIZE     80

extern intptr_t iom_base;
size_t cons_ptr __in_kdata = 0;

static void x86_putc(char c)
{
        if (c == '\n') {
                cons_ptr = roundup(cons_ptr, CONS_X_SIZE);
                return;
        }

        char *video = (char *)iom_base + (0xB8000 - IOM_BEGIN) + cons_ptr;
        *video = c;
        cons_ptr++, video++;
        *video = 0x7;
        cons_ptr++, video++;
}

static void x86_itoa(char *buf, unsigned long int n, int base)
{
        unsigned long int tmp;
        int i, j;

        tmp = n;
        i = 0;

        do {
                tmp = n % base;
                buf[i++] = (tmp < 10) ? (tmp + '0') : (tmp + 'a' - 10);
        } while (n /= base);
        buf[i--] = 0;

        for (j = 0; j < i; j++, i--) {
                tmp = buf[j];
                buf[j] = buf[i];
                buf[i] = tmp;
        }
}

void x86_printf(char *s, ...)
{
        va_list ap;

        char buf[16];
        int i, j, size, buflen, neg;

        unsigned char c;
        int ival;
        unsigned int uival;

        va_start(ap, s);

        while ((c = *s++)) {
                size = 0;
                neg = 0;

                if (c == 0)
                        break;
                else if (c == '%') {
                        c = *s++;
                        if (c >= '0' && c <= '9') {
                                size = c - '0';
                                c = *s++;
                        }

                        if (c == 'd') {
                                ival = va_arg(ap, int);
                                if (ival < 0) {
                                        uival = 0 - ival;
                                        neg++;
                                } else
                                        uival = ival;
                                x86_itoa(buf, uival, 10);

                                buflen = strlen(buf);
                                if (buflen < size)
                                        for (i = size, j = buflen; i >= 0;
                                             i--, j--)
                                                buf[i] =
                                                    (j >=
                                                     0) ? buf[j] : '0';

                                if (neg)
                                        x86_printf("-%s", buf);
                                else
                                        x86_printf(buf);
                        } else if (c == 'u') {
                                uival = va_arg(ap, int);
                                x86_itoa(buf, uival, 10);

                                buflen = strlen(buf);
                                if (buflen < size)
                                        for (i = size, j = buflen; i >= 0;
                                             i--, j--)
                                                buf[i] =
                                                    (j >=
                                                     0) ? buf[j] : '0';

                                x86_printf(buf);
                        } else if (c == 'x' || c == 'X') {
                                uival = va_arg(ap, int);
                                x86_itoa(buf, uival, 16);

                                buflen = strlen(buf);
                                if (buflen < size)
                                        for (i = size, j = buflen; i >= 0;
                                             i--, j--)
                                                buf[i] =
                                                    (j >=
                                                     0) ? buf[j] : '0';

                                x86_printf("0x%s", buf);
                        } else if (c == 'p') {
                                uival = va_arg(ap, int);
                                x86_itoa(buf, uival, 16);
                                size = 8;

                                buflen = strlen(buf);
                                if (buflen < size)
                                        for (i = size, j = buflen; i >= 0;
                                             i--, j--)
                                                buf[i] =
                                                    (j >=
                                                     0) ? buf[j] : '0';

                                x86_printf("0x%s", buf);
                        } else if (c == 's') {
                                x86_printf((char *) va_arg(ap, int));
                        } 
                } else
                        x86_putc(c);
        }

        return;
}