/* Copyright (c) 2000 TXT DataKonsult Ab & Monty Program Ab

   Copyright (c) 2009-2011, Monty Program Ab

   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 the following disclaimer in

     the documentation and/or other materials provided with the

     distribution.

   THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``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 <COPYRIGHT HOLDER> 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 "strings_def.h"

/*

  _dig_vec arrays are public because they are used in several outer places.

*/

const char _dig_vec_base62[] =

  "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

const char _dig_vec_upper[] =

  "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

const char _dig_vec_lower[] =

  "0123456789abcdefghijklmnopqrstuvwxyz";

/*

  Convert integer to its string representation in given scale of notation.

  SYNOPSIS

    int2str()

      val     - value to convert

      dst     - points to buffer where string representation should be stored

      radix   - radix of scale of notation

      upcase  - set to 1 if we should use upper-case digits

  DESCRIPTION

    Converts the (long) integer value to its character form and moves it to 

    the destination buffer followed by a terminating NUL. 

    If radix is -2..-62, val is taken to be SIGNED, if radix is  2..62, val is

    taken to be UNSIGNED. That is, val is signed if and only if radix is. 

    All other radixes treated as bad and nothing will be changed in this case.

    For conversion to decimal representation (radix is -10 or 10) one can use

    optimized int10_to_str() function.

  RETURN VALUE

    Pointer to ending NUL character or NullS if radix is bad.

*/

char *

int2str(register long int val, register char *dst, register int radix, 

        int upcase)

{

  char buffer[65];

  register char *p;

  long int new_val;

  const char *dig_vec;

  ulong uval= (ulong) val;

  if (radix < -36 || radix > 36)

    dig_vec= _dig_vec_base62;

  else

    dig_vec= upcase ? _dig_vec_upper : _dig_vec_lower;

  if (radix < 0)

  {

    if (radix < -62 || radix > -2)

      return NullS;

    if (val < 0)

    {

      *dst++ = '-';

      /* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */

      uval = (ulong)0 - uval;

    }

    radix = -radix;

  }

  else if (radix > 62 || radix < 2)

    return NullS;

  /*

    The slightly contorted code which follows is due to the fact that

    few machines directly support unsigned long / and %.  Certainly

    the VAX C compiler generates a subroutine call.  In the interests

    of efficiency (hollow laugh) I let this happen for the first digit

    only; after that "val" will be in range so that signed integer

    division will do.  Sorry 'bout that.  CHECK THE CODE PRODUCED BY

    YOUR C COMPILER.  The first % and / should be unsigned, the second

    % and / signed, but C compilers tend to be extraordinarily

    sensitive to minor details of style.  This works on a VAX, that's

    all I claim for it.

  */

  p = &buffer[sizeof(buffer)-1];

  *p = '\0';

  new_val= uval / (ulong) radix;

  *--p = dig_vec[(uchar) (uval- (ulong) new_val*(ulong) radix)];

  val = new_val;

#ifdef HAVE_LDIV

  while (val != 0)

  {

    ldiv_t res;

    res=ldiv(val,radix);

    *--p = dig_vec[res.rem];

    val= res.quot;

  }

#else

  while (val != 0)

  {

    new_val=val/radix;

    *--p = dig_vec[(uchar) (val-new_val*radix)];

    val= new_val;

  }

#endif

  while ((*dst++ = *p++) != 0) ;

  return dst-1;

}

/*

  Converts integer to its string representation in decimal notation.

  SYNOPSIS

    int10_to_str()

      val     - value to convert

      dst     - points to buffer where string representation should be stored

      radix   - flag that shows whenever val should be taken as signed or not

  DESCRIPTION

    This is version of int2str() function which is optimized for normal case

    of radix 10/-10. It takes only sign of radix parameter into account and 

    not its absolute value.

  RETURN VALUE

    Pointer to ending NUL character.

*/

char *int10_to_str(long int val,char *dst,int radix)

{

  char buffer[65];

  register char *p;

  long int new_val;

  unsigned long int uval = (unsigned long int) val;

  if (radix < 0)       /* -10 */

  {

    if (val < 0)

    {

      *dst++ = '-';

      /* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */

      uval = (unsigned long int)0 - uval;

    }

  }

  p = &buffer[sizeof(buffer)-1];

  *p = '\0';

  new_val= (long) (uval / 10);

  *--p = '0'+ (char) (uval - (unsigned long) new_val * 10);

  val = new_val;

  while (val != 0)

  {

    new_val=val/10;

    *--p = '0' + (char) (val-new_val*10);

    val= new_val;

  }

  while ((*dst++ = *p++) != 0) ;

  return dst-1;

}