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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

void print_double(double num, __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 (fmath_is_negative(num)) {

        putchar('-');

        }

    num=fmath_abs(num);

    /*

    if (fmath_is_infinity(num)) {

        print_str("Inf");

        }

    */

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

    /* Here is 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; 

    }

    if (intval==0.0) {

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

    } else {

        in1=intval;

        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;

}

/** Print NULL terminated string

 *

 * Print characters from str using putchar() until

 * \x00 character is reached.

 *

 * @param str Characters to print.

 *

 */

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.

 *

 */

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).

 *

 */

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]);

}

/** 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.

 * N    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.

 *

 * 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;

    va_start(ap, fmt);

    irqpri = cpu_priority_high();

    spinlock_lock(&printflock);

    while (c = fmt[i++]) {

        switch (c) {

            /* control character */

            case '%':

                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':

                case 'f':

                        print_double(va_arg(ap, double),DEFAULT_DOUBLE_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);

    cpu_priority_restore(irqpri);

    va_end(ap);

}