// TuxSH's changes: add support for 64-bit numbers, remove floating-point code
// TODO! fix left-padding handling with > 10 characters.

#include "fmt.h"
#include "strings.h"

/* File : barebones/ee_printf.c
	This file contains an implementation of ee_printf that only requires a method to output a char to a UART without pulling in library code.

This code is based on a file that contains the following:
 Copyright (C) 2002 Michael Ringgaard. All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. 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.
 3. Neither the name of the project nor the names of its contributors
    may be used to endorse or promote products derived from this software
    without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 <coremark.h>
//#include <stdarg.h>

#define ZEROPAD  	(1<<0)	/* Pad with zero */
#define SIGN    	(1<<1)	/* Unsigned/signed long */
#define PLUS    	(1<<2)	/* Show plus */
#define SPACE   	(1<<3)	/* Spacer */
#define LEFT    	(1<<4)	/* Left justified */
#define HEX_PREP 	(1<<5)	/* 0x */
#define UPPERCASE   (1<<6)	/* 'ABCDEF' */

#define is_digit(c) ((c) >= '0' && (c) <= '9')

static char *lower_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
static char *upper_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

/*
static size_t strnlen(const char *s, size_t count);

static size_t strnlen(const char *s, size_t count)
{
  const char *sc;
  for (sc = s; *sc != '\0' && count--; ++sc);
  return sc - s;
}
*/

static int ee_skip_atoi(const char **s)
{
  int i = 0;
  while (is_digit(**s)) i = i*10 + *((*s)++) - '0';
  return i;
}

static char *ee_number(char *str, long long num, int base, int size, int precision, int type)
{
  char c, sign, tmp[66];
  char *dig = lower_digits;
  int i;

  if (type & UPPERCASE)  dig = upper_digits;
  if (type & LEFT) type &= ~ZEROPAD;
  if (base < 2 || base > 36) return 0;

  c = (type & ZEROPAD) ? '0' : ' ';
  sign = 0;
  if (type & SIGN)
  {
    if (num < 0)
    {
      sign = '-';
      num = -num;
      size--;
    }
    else if (type & PLUS)
    {
      sign = '+';
      size--;
    }
    else if (type & SPACE)
    {
      sign = ' ';
      size--;
    }
  }

  if (type & HEX_PREP)
  {
    if (base == 16)
      size -= 2;
    else if (base == 8)
      size--;
  }

  i = 0;

  if (num == 0)
    tmp[i++] = '0';
  else
  {
    while (num != 0)
    {
      tmp[i++] = dig[(unsigned long long)num % (unsigned long long)base];
      num = (long long)((unsigned long long)num / (unsigned long long) base);
    }
  }

  if (i > precision) precision = i;
  size -= precision;
  if (!(type & (ZEROPAD | LEFT))) while (size-- > 0) *str++ = ' ';
  if (sign) *str++ = sign;

  if (type & HEX_PREP)
  {
    if (base == 8)
      *str++ = '0';
    else if (base == 16)
    {
      *str++ = '0';
      *str++ = lower_digits[33];
    }
  }

  if (!(type & LEFT)) while (size-- > 0) *str++ = c;
  while (i < precision--) *str++ = '0';
  while (i-- > 0) *str++ = tmp[i];
  while (size-- > 0) *str++ = ' ';

  return str;
}

static char *eaddr(char *str, unsigned char *addr, int size, int precision __attribute__((unused)), int type)
{
  char tmp[24];
  char *dig = lower_digits;
  int i, len;

  if (type & UPPERCASE)  dig = upper_digits;
  len = 0;
  for (i = 0; i < 6; i++)
  {
    if (i != 0) tmp[len++] = ':';
    tmp[len++] = dig[addr[i] >> 4];
    tmp[len++] = dig[addr[i] & 0x0F];
  }

  if (!(type & LEFT)) while (len < size--) *str++ = ' ';
  for (i = 0; i < len; ++i) *str++ = tmp[i];
  while (len < size--) *str++ = ' ';

  return str;
}

static char *iaddr(char *str, unsigned char *addr, int size, int precision __attribute__((unused)), int type)
{
  char tmp[24];
  int i, n, len;

  len = 0;
  for (i = 0; i < 4; i++)
  {
    if (i != 0) tmp[len++] = '.';
    n = addr[i];

    if (n == 0)
      tmp[len++] = lower_digits[0];
    else
    {
      if (n >= 100)
      {
        tmp[len++] = lower_digits[n / 100];
        n = n % 100;
        tmp[len++] = lower_digits[n / 10];
        n = n % 10;
      }
      else if (n >= 10)
      {
        tmp[len++] = lower_digits[n / 10];
        n = n % 10;
      }

      tmp[len++] = lower_digits[n];
    }
  }

  if (!(type & LEFT)) while (len < size--) *str++ = ' ';
  for (i = 0; i < len; ++i) *str++ = tmp[i];
  while (len < size--) *str++ = ' ';

  return str;
}

static int ee_vsprintf(char *buf, const char *fmt, va_list args)
{
  int len;
  long long num;
  int i, base;
  char *str;
  char *s;
  int flags;            // Flags to number()

  int field_width;      // Width of output field
  int precision;        // Min. # of digits for integers; max number of chars for from string
  int qualifier;        // 'h', 'l', or 'L' for integer fields
  int qualifier2;

  for (str = buf; *fmt; fmt++)
  {
    if (*fmt != '%')
    {
      *str++ = *fmt;
      continue;
    }

    // Process flags
    flags = 0;
repeat:
    fmt++; // This also skips first '%'
    switch (*fmt)
    {
      case '-': flags |= LEFT; goto repeat;
      case '+': flags |= PLUS; goto repeat;
      case ' ': flags |= SPACE; goto repeat;
      case '#': flags |= HEX_PREP; goto repeat;
      case '0': flags |= ZEROPAD; goto repeat;
    }

    // Get field width
    field_width = -1;
    if (is_digit(*fmt))
      field_width = ee_skip_atoi(&fmt);
    else if (*fmt == '*')
    {
      fmt++;
      field_width = va_arg(args, int);
      if (field_width < 0)
      {
        field_width = -field_width;
        flags |= LEFT;
      }
    }

    // Get the precision
    precision = -1;
    if (*fmt == '.')
    {
      ++fmt;
      if (is_digit(*fmt))
        precision = ee_skip_atoi(&fmt);
      else if (*fmt == '*')
      {
        ++fmt;
        precision = va_arg(args, int);
      }
      if (precision < 0) precision = 0;
    }

    // Get the conversion qualifier
    qualifier = qualifier2 = -1;
    if(*fmt == 'L')
        qualifier = *fmt++;
    else if (*fmt == 'l')
    {
      qualifier = *fmt++;
      if(*fmt == 'l') qualifier2 = *fmt++;
    }
    else if (*fmt == 'h')
    {
      qualifier = *fmt++;
      if(*fmt == 'h') qualifier2 = *fmt++;
    }

    // Default base
    base = 10;

    switch (*fmt)
    {
      case 'c':
        if (!(flags & LEFT)) while (--field_width > 0) *str++ = ' ';
        *str++ = (unsigned char) va_arg(args, int);
        while (--field_width > 0) *str++ = ' ';
        continue;

      case 's':
        s = va_arg(args, char *);
        if (!s) s = "<NULL>";
        if(precision != -1)
            len = strnlen(s, precision);
        else
            len = strlen(s);
        if (!(flags & LEFT)) while (len < field_width--) *str++ = ' ';
        for (i = 0; i < len; ++i) *str++ = *s++;
        while (len < field_width--) *str++ = ' ';
        continue;

      case 'p':
        if (field_width == -1)
        {
          field_width = 2 * sizeof(void *);
          flags |= ZEROPAD;
        }
        str = ee_number(str, (unsigned long) va_arg(args, void *), 16, field_width, precision, flags);
        continue;

      case 'A':
        flags |= UPPERCASE;

      case 'a':
        if (qualifier == 'l')
          str = eaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
        else
          str = iaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
        continue;

      // Integer number formats - set up the flags and "break"
      case 'o':
        base = 8;
        break;

      case 'X':
        flags |= UPPERCASE;

      case 'x':
        base = 16;
        break;

      case 'd':
      case 'i':
        flags |= SIGN;

      case 'u':
        break;

      default:
        if (*fmt != '%') *str++ = '%';
        if (*fmt)
          *str++ = *fmt;
        else
          --fmt;
        continue;
    }

    // bugfixes here:

    if(flags & SIGN)
    {
        if (qualifier == 'l' && qualifier2 == 'l')
            num = va_arg(args, long long int);
        else if(qualifier == 'l')
            num = va_arg(args, long int);
/*        else if(qualifier == 'h' && qualifier == 'h')
            num = va_arg(args, signed char);
        else if(qualifier == 'h')
            num = va_arg(args, short);*/
        else
            num = va_arg(args, int);
    }
    else
    {
      if (qualifier == 'l' && qualifier2 == 'l')
        num = va_arg(args, unsigned long long int);
      else if(qualifier == 'l')
        num = va_arg(args, unsigned long int);
/*      else if(qualifier == 'h' && qualifier == 'h')
          num = va_arg(args, unsigned char);
        else if(qualifier == 'h')
          num = va_arg(args, unsigned short);*/
      else
        num = va_arg(args, unsigned int);
    }

    str = ee_number(str, num, base, field_width, precision, flags);
  }

  *str = '\0';
  return str - buf;
}

int vsprintf(char *buf, const char *fmt, va_list args)
{
    return ee_vsprintf(buf, fmt, args);
}

int sprintf(char *buf, const char *fmt, ...)
{
    int n = 0;
    va_list args;
    va_start(args, fmt);
    n = ee_vsprintf(buf, fmt, args);
    va_end(args);
    return n;
}