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/*

 * Copyright (C) 2001-2004 Jakub Jermar

 * 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.

 */

#include <putchar.h>

#include <print.h>

#include <synch/spinlock.h>

#include <arch/arg.h>

#include <arch/asm.h>

#include <arch/fmath.h>

#include <arch.h>

static char digits[] = "0123456789abcdef"; /**< Hexadecimal characters */

static spinlock_t printflock;              /**< printf spinlock */

#define DEFAULT_DOUBLE_PRECISION 16

#define DEFAULT_DOUBLE_BUFFER_SIZE 128

/** Print NULL terminated string

 *

 * Print characters from str using putchar() until

 * \\0 character is reached.

 *

 * @param str Characters to print.

 *

 */

static void print_str(const char *str)

{

    int i = 0;

    char c;

    while (c = str[i++])

        putchar(c);

}

/** Print hexadecimal digits

 *

 * Print fixed count of hexadecimal digits from

 * the number num. The digits are printed in

 * natural left-to-right order starting with

 * the width-th digit.

 *

 * @param num   Number containing digits.

 * @param width Count of digits to print.

 *

 */

static void print_fixed_hex(const __u64 num, const int width)

{

    int i;

    for (i = width*8 - 4; i >= 0; i -= 4)

        putchar(digits[(num>>i) & 0xf]);

}

/** Print number in given base

 *

 * Print significant digits of a number in given

 * base.

 *

 * @param num  Number to print.

 * @param base Base to print the number in (should

 *             be in range 2 .. 16).

 *

 */

static void print_number(const __native num, const unsigned int base)

{

    int val = num;

    char d[sizeof(__native)*8+1];       /* this is good enough even for base == 2 */

    int i = sizeof(__native)*8-1;

    do {

        d[i--] = digits[val % base];

    } while (val /= base);

    d[sizeof(__native)*8] = 0; 

    print_str(&d[i + 1]);

}

static void print_double(double num, __u8 modifier, __u16 precision)

{

    double intval,intval2;

    int counter;

    int exponent,exponenttmp;

    unsigned char buf[DEFAULT_DOUBLE_BUFFER_SIZE];

    unsigned long in1,in2; 

    if (fmath_is_nan(num)) {

        print_str("NaN");

        return;

    }

    if (num<0.0) {

        putchar('-');

        num=num*-1.0;

    }

    if (fmath_is_infinity(num)) {

        print_str("Inf");

        return;

    }

    if ((modifier=='E')||(modifier=='e')) {

        intval2=fmath_fint(fmath_get_decimal_exponent(num),&intval);

        exponent=intval;

        if ((intval2<0.0)) exponent--;

        num = num / ((fmath_dpow(10.0,exponent)));

        print_double(num,modifier+1,precision); /* modifier+1 = E => F or e => f */

        putchar(modifier);

        if (exponent<0) {

            putchar('-');

            exponent*=-1;

        }

        print_number(exponent,10);

        return;

    }

    /* TODO: rounding constant - when we got fraction >= 0.5, we must increment last printed number */

    /*

     * Here is a problem with cumulative error while printing big double values -> we will divide

     * the number with a power of 10, print new number with better method for small numbers and

     * then print decimal point at correct position.

     */

    fmath_fint(fmath_get_decimal_exponent(num),&intval);

    exponent=(intval>0.0?intval:0);

    precision+=exponent;

    if (exponent>0) num = num / ((fmath_dpow(10.0,exponent)));

    num=fmath_fint(num,&intval);

    if (precision>0) {

        counter=precision-1;

        if (exponent>0) counter++;

        if (counter>=DEFAULT_DOUBLE_BUFFER_SIZE) {

            counter=DEFAULT_DOUBLE_BUFFER_SIZE;

        }

        exponenttmp=exponent;

        while(counter>=0) {

            num *= 10.0;

            num = fmath_fint(num,&intval2);

            buf[counter--]=((int)intval2)+'0';

            exponenttmp--;

            if ((exponenttmp==0)&&(counter>=0)) buf[counter--]='.';

        }

        counter=precision;

        if ((exponent==0)&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) buf[counter]='.';

        counter++; 

    } else {

        counter=0; 

    }

    in1=intval;

    if (in1==0.0) {

        if (counter<DEFAULT_DOUBLE_BUFFER_SIZE) buf[counter++]='0';

    } else {

        while(( in1>0 )&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) {

            in2=in1;

            in1/=10;

            buf[counter]=in2-in1*10 + '0';

            counter++;

        }

    }

    counter = (counter>=DEFAULT_DOUBLE_BUFFER_SIZE?DEFAULT_DOUBLE_BUFFER_SIZE:counter);

    while (counter>0) {

        putchar(buf[--counter]);

    }

    return;

}

/** General formatted text print

 *

 * Print text formatted according the fmt parameter

 * and variant arguments. Each formatting directive

 * begins with \% (percentage) character and one of the

 * following character:

 *

 * \%    Prints the percentage character.

 *

 * s    The next variant argument is treated as char*

 *      and printed as a NULL terminated string.

 *

 * c    The next variant argument is treated as a single char.

 *

 * p    The next variant argument is treated as a maximum

 *      bit-width integer with respect to architecture

 *      and printed in full hexadecimal width.

 *

 * P    As with 'p', but '0x' is prefixed.

 *

 * q    The next variant argument is treated as a 64b integer

 *      and printed in full hexadecimal width.

 *

 * Q    As with 'q', but '0x' is prefixed.

 *

 * l    The next variant argument is treated as a 32b integer

 *      and printed in full hexadecimal width.

 *

 * L    As with 'l', but '0x' is prefixed.

 *

 * w    The next variant argument is treated as a 16b integer

 *      and printed in full hexadecimal width.

 *

 * W    As with 'w', but '0x' is prefixed.

 *

 * b    The next variant argument is treated as a 8b integer

 *      and printed in full hexadecimal width.

 *

 * B    As with 'b', but '0x' is prefixed.

 *

 * d    The next variant argument is treated as integer

 *      and printed in standard decimal format (only significant

 *      digits).

 *

 * x    The next variant argument is treated as integer

 *      and printed in standard hexadecimal format (only significant

 *      digits).

 *

 * X    As with 'x', but '0x' is prefixed.

 *

 * .    The decimal number following period will be treated as precision

 *      for printing floating point numbers. One of 'e', 'E', 'f' or 'F'

 *      must follow.

 *

 * e    The next variant argument is treated as double precision float

 *      and printed in exponent notation with only one digit before decimal point

 *      in specified precision. The exponent sign is printed as 'e'.

 *

 * E    As with 'e', but the exponent sign is printed as 'E'.

 *

 * f    The next variant argument is treated as double precision float

 *      and printed in decimal notation in specified precision.

 *

 * F    As with 'f'.

 *

 * All other characters from fmt except the formatting directives

 * are printed in verbatim.

 *

 * @param fmt Formatting NULL terminated string.

 */

void printf(const char *fmt, ...)

{

    int irqpri, i = 0;

    va_list ap;

    char c;

    __u16 precision;

    va_start(ap, fmt);

    irqpri = interrupts_disable();

    spinlock_lock(&printflock);

    while (c = fmt[i++]) {

        switch (c) {

            /* control character */

            case '%':

            precision = DEFAULT_DOUBLE_PRECISION;

            if (fmt[i]=='.') {

                precision=0;

                c=fmt[++i];

                while((c>='0')&&(c<='9')) {

                    precision = precision*10 + c - '0';

                    c=fmt[++i];

                }

            }

            switch (c = fmt[i++]) {

                /* percentile itself */

                case '%':

                break;

                /*

                 * String and character conversions.

                 */

                case 's':

                print_str(va_arg(ap, char_ptr));

                goto loop;

                case 'c':

                c = (char) va_arg(ap, int);

                break;

                /*

                     * Hexadecimal conversions with fixed width.

                     */

                case 'P':

                print_str("0x");

                case 'p':

                    print_fixed_hex(va_arg(ap, __native), sizeof(__native));

                goto loop;

                case 'Q':

                print_str("0x");

                case 'q':

                    print_fixed_hex(va_arg(ap, __u64), INT64);

                goto loop;

                case 'L':

                print_str("0x");

                case 'l':

                    print_fixed_hex(va_arg(ap, __native), INT32);

                goto loop;

                case 'W':

                print_str("0x");

                case 'w':

                    print_fixed_hex(va_arg(ap, __native), INT16);

                goto loop;

                case 'B':

                print_str("0x");

                case 'b':

                    print_fixed_hex(va_arg(ap, __native), INT8);

                goto loop;

                /*

                     * Floating point conversions.

                     */

                case 'F':

                    print_double(va_arg(ap, double),'F',precision);

                goto loop;

                case 'f':

                    print_double(va_arg(ap, double),'f',precision);

                goto loop;

                case 'E':

                    print_double(va_arg(ap, double),'E',precision);

                goto loop;

                case 'e':

                    print_double(va_arg(ap, double),'e',precision);

                goto loop;

                /*

                     * Decimal and hexadecimal conversions.

                     */

                case 'd':

                    print_number(va_arg(ap, __native), 10);

                goto loop;

                case 'X':

                print_str("0x");

                case 'x':

                    print_number(va_arg(ap, __native), 16);

                goto loop;

                /*

                 * Bad formatting.

                 */

                default:

                goto out;

            }

            default: putchar(c);

        }

loop:

        ;

    }

out:

    spinlock_unlock(&printflock);

    interrupts_restore(irqpri);

    va_end(ap);

}