mariadb/strings/longlong2str.c

/* 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
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   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
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*/

/*
  Defines: longlong2str();

  longlong2str(dst, radix, val)
  converts the (longlong) integer "val" to character form and moves it to
  the destination string "dst" followed by a terminating NUL.  The
  result is normally a pointer to this NUL character, but if the radix
  is dud the result will be NullS and nothing will be changed.

  If radix is -2..-36, val is taken to be SIGNED.
  If radix is  2.. 36, val is taken to be UNSIGNED.
  That is, val is signed if and only if radix is.  You will normally
  use radix -10 only through itoa and ltoa, for radix 2, 8, or 16
  unsigned is what you generally want.

  _dig_vec is public just in case someone has a use for it.
  The definitions of itoa and ltoa are actually macros in m_string.h,
  but this is where the code is.

  Note: The standard itoa() returns a pointer to the argument, when int2str
	returns the pointer to the end-null.
	itoa assumes that 10 -base numbers are always signed and other aren't.
*/

#include "strings_def.h"

#ifndef ll2str

/*
  This assumes that longlong multiplication is faster than longlong division.
*/

char *ll2str(longlong val,char *dst,int radix, int upcase)
{
  char buffer[65];
  register char *p;
  long long_val;
  const char *dig_vec= upcase ? _dig_vec_upper : _dig_vec_lower;
  ulonglong uval= (ulonglong) val;

  if (radix < 0)
  {
    if (radix < -36 || radix > -2) return (char*) 0;
    if (val < 0) {
      *dst++ = '-';
      /* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */
      uval = (ulonglong)0 - uval;
    }
    radix = -radix;
  }
  else
  {
    if (radix > 36 || radix < 2) return (char*) 0;
  }
  if (uval == 0)
  {
    *dst++='0';
    *dst='\0';
    return dst;
  }
  p = &buffer[sizeof(buffer)-1];
  *p = '\0';

  while (uval > (ulonglong) LONG_MAX)
  {
    ulonglong quo= uval/(uint) radix;
    uint rem= (uint) (uval- quo* (uint) radix);
    *--p= dig_vec[rem];
    uval= quo;
  }
  long_val= (long) uval;
  while (long_val != 0)
  {
    long quo= long_val/radix;
    *--p= dig_vec[(uchar) (long_val - quo*radix)];
    long_val= quo;
  }
  while ((*dst++ = *p++) != 0) ;
  return dst-1;
}
#endif

#ifndef longlong10_to_str
char *longlong10_to_str(longlong val,char *dst,int radix)
{
  char buffer[65];
  register char *p;
  long long_val;
  ulonglong uval= (ulonglong) val;

  if (radix < 0)
  {
    if (val < 0)
    {
      *dst++ = '-';
      /* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */
      uval = (ulonglong)0 - uval;
    }
  }

  if (uval == 0)
  {
    *dst++='0';
    *dst='\0';
    return dst;
  }
  p = &buffer[sizeof(buffer)-1];
  *p = '\0';

  while (uval > (ulonglong) LONG_MAX)
  {
    ulonglong quo= uval/(uint) 10;
    uint rem= (uint) (uval- quo* (uint) 10);
    *--p = _dig_vec_upper[rem];
    uval= quo;
  }
  long_val= (long) uval;
  while (long_val != 0)
  {
    long quo= long_val/10;
    *--p = _dig_vec_upper[(uchar) (long_val - quo*10)];
    long_val= quo;
  }
  while ((*dst++ = *p++) != 0) ;
  return dst-1;
}
#endif