Drizzled Public API Documentation

longlong2str.cc
1 /* Copyright (C) 2000 MySQL AB
2 
3  This program is free software; you can redistribute it and/or modify
4  it under the terms of the GNU General Public License as published by
5  the Free Software Foundation; version 2 of the License.
6 
7  This program is distributed in the hope that it will be useful,
8  but WITHOUT ANY WARRANTY; without even the implied warranty of
9  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  GNU General Public License for more details.
11 
12  You should have received a copy of the GNU General Public License
13  along with this program; if not, write to the Free Software
14  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
15 
16 /*
17  Defines: int64_t2str();
18 
19  int64_t2str(dst, radix, val)
20  converts the (int64_t) integer "val" to character form and moves it to
21  the destination string "dst" followed by a terminating NUL. The
22  result is normally a pointer to this NUL character, but if the radix
23  is dud the result will be NULL and nothing will be changed.
24 
25  If radix is -2..-36, val is taken to be SIGNED.
26  If radix is 2.. 36, val is taken to be UNSIGNED.
27  That is, val is signed if and only if radix is. You will normally
28  use radix -10 only through itoa and ltoa, for radix 2, 8, or 16
29  unsigned is what you generally want.
30 
31  _dig_vec is public just in case someone has a use for it.
32  The definitions of itoa and ltoa are actually macros in m_string.h,
33  but this is where the code is.
34 
35  Note: The standard itoa() returns a pointer to the argument, when int2str
36  returns the pointer to the end-null.
37  itoa assumes that 10 -base numbers are allways signed and other arn't.
38 */
39 
40 #include <config.h>
41 
42 #include "m_string.h"
43 
44 namespace drizzled {
45 namespace internal {
46 
47 #if !defined(int64_t2str) && !defined(HAVE_LONGLONG2STR)
48 
49 char _dig_vec_upper[] =
50  "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
51 
52 /*
53  This assumes that int64_t multiplication is faster than int64_t division.
54 */
55 
56 char *int64_t2str(int64_t val,char *dst,int radix)
57 {
58  char buffer[65];
59  long long_val;
60  uint64_t uval= (uint64_t) val;
61 
62  if (radix < 0)
63  {
64  if (radix < -36 || radix > -2) return (char*) 0;
65  if (val < 0) {
66  *dst++ = '-';
67  /* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */
68  uval = (uint64_t)0 - uval;
69  }
70  radix = -radix;
71  }
72  else
73  {
74  if (radix > 36 || radix < 2) return (char*) 0;
75  }
76  if (uval == 0)
77  {
78  *dst++='0';
79  *dst='\0';
80  return dst;
81  }
82  char* p = &buffer[sizeof(buffer)-1];
83  *p = '\0';
84 
85  while (uval > (uint64_t) LONG_MAX)
86  {
87  uint64_t quo= uval/(uint32_t) radix;
88  uint32_t rem= (uint32_t) (uval- quo* (uint32_t) radix);
89  *--p = _dig_vec_upper[rem];
90  uval= quo;
91  }
92  long_val= (long) uval;
93  while (long_val != 0)
94  {
95  long quo= long_val/radix;
96  *--p = _dig_vec_upper[(unsigned char) (long_val - quo*radix)];
97  long_val= quo;
98  }
99  while ((*dst++ = *p++) != 0) ;
100  return dst-1;
101 }
102 
103 #endif
104 
105 #ifndef int64_t10_to_str
106 char *int64_t10_to_str(int64_t val,char *dst,int radix)
107 {
108  char buffer[65];
109  long long_val;
110  uint64_t uval= (uint64_t) val;
111 
112  if (radix < 0)
113  {
114  if (val < 0)
115  {
116  *dst++ = '-';
117  /* Avoid integer overflow in (-val) for LONGLONG_MIN (BUG#31799). */
118  uval = (uint64_t)0 - uval;
119  }
120  }
121 
122  if (uval == 0)
123  {
124  *dst++='0';
125  *dst='\0';
126  return dst;
127  }
128  char* p = &buffer[sizeof(buffer)-1];
129  *p = '\0';
130 
131  while (uval > (uint64_t) LONG_MAX)
132  {
133  uint64_t quo= uval/(uint32_t) 10;
134  uint32_t rem= (uint32_t) (uval- quo* (uint32_t) 10);
135  *--p = _dig_vec_upper[rem];
136  uval= quo;
137  }
138  long_val= (long) uval;
139  while (long_val != 0)
140  {
141  long quo= long_val/10;
142  *--p = _dig_vec_upper[(unsigned char) (long_val - quo*10)];
143  long_val= quo;
144  }
145  while ((*dst++ = *p++) != 0) ;
146  return dst-1;
147 }
148 #endif
149 
150 } /* namespace internal */
151 } /* namespace drizzled */
TODO: Rename this file - func.h is stupid.