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