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/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <my_global.h>
#include "m_string.h"
/*
_dig_vec arrays are public because they are used in several outer places.
*/
char NEAR _dig_vec_upper[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char NEAR _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..-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.
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;
char *dig_vec= upcase ? _dig_vec_upper : _dig_vec_lower;
ulong uval= (ulong) val;
if (radix < 0)
{
if (radix < -36 || 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 > 36 || 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;
}
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