longlong2str.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* 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; either version 2 of the License, or
- (at your option) any later version.
- 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 */
- /*
- 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 allways signed and other arn't.
- */
- #include <my_global.h>
- #include "m_string.h"
- #if defined(HAVE_LONG_LONG) && !defined(longlong2str) && !defined(HAVE_LONGLONG2STR)
- /*
- This assumes that longlong multiplication is faster than longlong division.
- */
- char *longlong2str(longlong val,char *dst,int radix)
- {
- char buffer[65];
- register char *p;
- long long_val;
- if (radix < 0)
- {
- if (radix < -36 || radix > -2) return (char*) 0;
- if (val < 0) {
- *dst++ = '-';
- val = -val;
- }
- radix = -radix;
- }
- else
- {
- if (radix > 36 || radix < 2) return (char*) 0;
- }
- if (val == 0)
- {
- *dst++='0';
- *dst=' ';
- return dst;
- }
- p = &buffer[sizeof(buffer)-1];
- *p = ' ';
- while ((ulonglong) val > (ulonglong) LONG_MAX)
- {
- ulonglong quo=(ulonglong) val/(uint) radix;
- uint rem= (uint) (val- quo* (uint) radix);
- *--p = _dig_vec_upper[rem];
- val= quo;
- }
- long_val= (long) val;
- while (long_val != 0)
- {
- long quo= long_val/radix;
- *--p = _dig_vec_upper[(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;
- if (radix < 0)
- {
- if (val < 0)
- {
- *dst++ = '-';
- val = -val;
- }
- }
- if (val == 0)
- {
- *dst++='0';
- *dst=' ';
- return dst;
- }
- p = &buffer[sizeof(buffer)-1];
- *p = ' ';
- while ((ulonglong) val > (ulonglong) LONG_MAX)
- {
- ulonglong quo=(ulonglong) val/(uint) 10;
- uint rem= (uint) (val- quo* (uint) 10);
- *--p = _dig_vec_upper[rem];
- val= quo;
- }
- long_val= (long) val;
- 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