source: rtos_arduino/trunk/arduino_lib/hardware/arduino/samd/cores/arduino/itoa.c@ 136

Last change on this file since 136 was 136, checked in by ertl-honda, 8 years ago

ライブラリとOS及びベーシックなサンプルの追加．
File size: 2.9 KB
Line 
1/*
2 Copyright (c) 2011 Arduino. All right reserved.
3
4 This library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 This library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 See the GNU Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with this library; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17*/
18
19#include "itoa.h"
20#include <string.h>
21
22#ifdef __cplusplus
23extern "C"{
24#endif // __cplusplus
25
26#if 0
27/* reverse: reverse string s in place */
28static void reverse( char s[] )
29{
30 int i, j ;
31 char c ;
32
33 for ( i = 0, j = strlen(s)-1 ; i < j ; i++, j-- )
34 {
35 c = s[i] ;
36 s[i] = s[j] ;
37 s[j] = c ;
38 }
39}
40
41/* itoa: convert n to characters in s */
42extern void itoa( int n, char s[] )
43{
44 int i, sign ;
45
46 if ( (sign = n) < 0 ) /* record sign */
47 {
48 n = -n; /* make n positive */
49 }
50
51 i = 0;
52 do
53 { /* generate digits in reverse order */
54 s[i++] = n % 10 + '0'; /* get next digit */
55 } while ((n /= 10) > 0) ; /* delete it */
56
57 if (sign < 0 )
58 {
59 s[i++] = '-';
60 }
61
62 s[i] = '\0';
63
64 reverse( s ) ;
65}
66
67#else
68
69extern char* itoa( int value, char *string, int radix )
70{
71 return ltoa( value, string, radix ) ;
72}
73
74extern char* ltoa( long value, char *string, int radix )
75{
76 char tmp[33];
77 char *tp = tmp;
78 long i;
79 unsigned long v;
80 int sign;
81 char *sp;
82
83 if ( string == NULL )
84 {
85 return 0 ;
86 }
87
88 if (radix > 36 || radix <= 1)
89 {
90 return 0 ;
91 }
92
93 sign = (radix == 10 && value < 0);
94 if (sign)
95 {
96 v = -value;
97 }
98 else
99 {
100 v = (unsigned long)value;
101 }
102
103 while (v || tp == tmp)
104 {
105 i = v % radix;
106 v = v / radix;
107 if (i < 10)
108 *tp++ = i+'0';
109 else
110 *tp++ = i + 'a' - 10;
111 }
112
113 sp = string;
114
115 if (sign)
116 *sp++ = '-';
117 while (tp > tmp)
118 *sp++ = *--tp;
119 *sp = 0;
120
121 return string;
122}
123
124extern char* utoa( unsigned long value, char *string, int radix )
125{
126 return ultoa( value, string, radix ) ;
127}
128
129extern char* ultoa( unsigned long value, char *string, int radix )
130{
131 char tmp[33];
132 char *tp = tmp;
133 long i;
134 unsigned long v = value;
135 char *sp;
136
137 if ( string == NULL )
138 {
139 return 0;
140 }
141
142 if (radix > 36 || radix <= 1)
143 {
144 return 0;
145 }
146
147 while (v || tp == tmp)
148 {
149 i = v % radix;
150 v = v / radix;
151 if (i < 10)
152 *tp++ = i+'0';
153 else
154 *tp++ = i + 'a' - 10;
155 }
156
157 sp = string;
158
159
160 while (tp > tmp)
161 *sp++ = *--tp;
162 *sp = 0;
163
164 return string;
165}
166#endif /* 0 */
167
168#ifdef __cplusplus
169} // extern "C"
170#endif // __cplusplus
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