/* 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.
*/

/*
  strtol,strtoul,strtoll,strtoull
  convert string to long, unsigned long, long long or unsigned long long.
  strtoxx(char *src,char **ptr,int base)
  converts the string pointed to by src to an long of appropriate long and
  returnes it. It skips leading spaces and tabs (but not newlines, formfeeds,
  backspaces), then it accepts an optional sign and a sequence of digits
  in the specified radix.
  If the value of ptr is not (char **)NULL, a pointer to the character
  terminating the scan is returned in the location pointed to by ptr.
  Trailing spaces will NOT be skipped.

  If an error is detected, the result will be LONG_MIN, 0 or LONG_MAX,
  (or LONGLONG..)  and errno will be set to
	EDOM	if there are no digits
	ERANGE	if the result would overflow.
  the ptr will be set to src.
  This file is based on the strtol from the the GNU C Library.
  it can be compiled with the UNSIGNED and/or LONGLONG flag set
*/


#if !defined(_global_h) || !defined(_m_string_h)
#  error  Calling file must include 'my_global.h' and 'm_string.h'
   /* see 'strtoll.c' and 'strtoull.c' for the reasons */
#endif

#include <m_ctype.h>
#include "my_sys.h"			/* defines errno */
#include <errno.h>

#undef strtoull
#undef strtoll
#undef strtoul
#undef strtol
#ifdef USE_LONGLONG
#define UTYPE_MAX (~(ulonglong) 0)
#define TYPE_MIN LONGLONG_MIN
#define TYPE_MAX LONGLONG_MAX
#define longtype longlong
#define ulongtype ulonglong
#ifdef USE_UNSIGNED
#define function ulongtype strtoull
#else
#define function longtype strtoll
#endif
#else
#define UTYPE_MAX (ulong) ~0L
#define TYPE_MIN LONG_MIN
#define TYPE_MAX LONG_MAX
#define longtype long
#define ulongtype unsigned long
#ifdef USE_UNSIGNED
#define function ulongtype strtoul
#else
#define function longtype strtol
#endif
#endif


/* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
   If BASE is 0 the base is determined by the presence of a leading
   zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
   If BASE is < 2 or > 36, it is reset to 10.
   If ENDPTR is not NULL, a pointer to the character after the last
   one converted is stored in *ENDPTR.	*/


function (const char *nptr,char **endptr,int base)
{
  int negative;
  register ulongtype cutoff;
  register unsigned int cutlim;
  register ulongtype i;
  register const char *s;
  register uchar c;
  const char *save;
  int overflow;

  if (base < 0 || base == 1 || base > 36)
    base = 10;

  s = nptr;

  /* Skip white space.	*/
  while (my_isspace(&my_charset_latin1, *s))
    ++s;
  if (*s == '\0')
  {
    goto noconv;
  }

  /* Check for a sign.	*/
  negative= 0;
  if (*s == '-')
  {
    negative = 1;
    ++s;
  }
  else if (*s == '+')
  {
    ++s;
  }
    

  if (base == 16 && s[0] == '0' && my_toupper (&my_charset_latin1, s[1]) == 'X')
    s += 2;

  /* If BASE is zero, figure it out ourselves.	*/
  if (base == 0)
  {
    if (*s == '0')
    {
      if (my_toupper (&my_charset_latin1, s[1]) == 'X')
      {
	s += 2;
	base = 16;
      }
      else
	base = 8;
    }
    else
      base = 10;
  }

  /* Save the pointer so we can check later if anything happened.  */
  save = s;

  cutoff = UTYPE_MAX / (unsigned long int) base;
  cutlim = (uint) (UTYPE_MAX % (unsigned long int) base);

  overflow = 0;
  i = 0;
  for (c = *s; c != '\0'; c = *++s)
  {
    if (my_isdigit (&my_charset_latin1, c))
      c -= '0';
    else if (my_isalpha (&my_charset_latin1, c))
      c = my_toupper (&my_charset_latin1, c) - 'A' + 10;
    else
      break;
    if (c >= base)
      break;
    /* Check for overflow.  */
    if (i > cutoff || (i == cutoff && c > cutlim))
      overflow = 1;
    else
    {
      i *= (ulongtype) base;
      i += c;
    }
  }

  /* Check if anything actually happened.  */
  if (s == save)
    goto noconv;

  /* Store in ENDPTR the address of one character
     past the last character we converted.  */
  if (endptr != NULL)
    *endptr = (char *) s;

#ifndef USE_UNSIGNED
  /* Check for a value that is within the range of
     `unsigned long int', but outside the range of `long int'.	*/
  if (negative)
  {
    if (i  > (ulongtype) TYPE_MIN)
      overflow = 1;
  }
  else if (i > (ulongtype) TYPE_MAX)
    overflow = 1;
#endif

  if (overflow)
  {
    my_errno=ERANGE;
#ifdef USE_UNSIGNED
    return UTYPE_MAX;
#else
    return negative ? TYPE_MIN : TYPE_MAX;
#endif
  }

  /* Return the result of the appropriate sign.  */
  return (negative ? -((longtype) i) : (longtype) i);

noconv:
  /* There was no number to convert.  */
  my_errno=EDOM;
  if (endptr != NULL)
    *endptr = (char *) nptr;
  return 0L;
}