gbdk-2020 | GameBoy Development Kit |
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gbdk-lib/libc/asm/mos6502/__itoa.c
1 /*-------------------------------------------------------------------------
2 _itoa.c - integer to string conversion
3
4 Copyright (c) 1999, Bela Torok, bela.torok@kssg.ch
5
6 This library is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
9 later version.
10
11 This library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this library; see the file COPYING. If not, write to the
18 Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
19 MA 02110-1301, USA.
20
21 As a special exception, if you link this library with other files,
22 some of which are compiled with SDCC, to produce an executable,
23 this library does not by itself cause the resulting executable to
24 be covered by the GNU General Public License. This exception does
25 not however invalidate any other reasons why the executable file
26 might be covered by the GNU General Public License.
27 -------------------------------------------------------------------------*/
28
29 #include <stdlib.h>
30
31 /*-------------------------------------------------------------------------
32 usage:
33
34 __uitoa(unsigned int value, char* string, int radix)
35 __itoa(int value, char* string, int radix)
36
37 value -> Number to be converted
38 string -> Result
39 radix -> Base of value (e.g.: 2 for binary, 10 for decimal, 16 for hex)
40 ---------------------------------------------------------------------------*/
41
42 void __uitoa(unsigned int value, char* string, unsigned char radix)
43 {
44 signed char index = 0, i = 0;
45
46 /* generate the number in reverse order */
47 do {
48 string[index] = '0' + (value % radix);
49 if (string[index] > '9')
50 string[index] += 'A' - '9' - 1;
51 value /= radix;
52 ++index;
53 } while (value != 0);
54
55 /* null terminate the string */
56 string[index--] = '\0';
57
58 /* reverse the order of digits */
59 while (index > i) {
60 char tmp = string[i];
61 string[i] = string[index];
62 string[index] = tmp;
63 ++i;
64 --index;
65 }
66 }
67
68 char *uitoa(unsigned int value, char *string, unsigned char radix) OLDCALL
69 {
70 __uitoa(value, string, radix);
71 return string;
72 }
73
74 char* itoa(int value, char* string, unsigned char radix) OLDCALL
75 {
76 char* s = string;
77 if (value < 0 && radix == 10) {
78 *string++ = '-';
79 value = -value;
80 }
81 __uitoa(value, string, radix);
82 return s;
83 }
84
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