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1 /**
2 * Copyright (C) 2015 Aaron Ball <nullspoon@iohq.net>
3 *
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 3 of the License, or
7 * (at your option) any later version.
8 *
9 * This program 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. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 */
17 #include "common.h"
18
19 /**
20 * The complimentary function to the posix atoi. It turns an integer into a
21 * string.
22 *
23 * @param i Integer to be converted to string
24 * @param out Output char array. Be sure it has enough room for the output
25 * string.
26 *
27 * @return int The character count of the output char array
28 */
29 int itoa(int i, char* out) {
30 char buf[256];
31 int n = 0;
32
33 // To keep track of where we are in the array
34 while(i > 9) {
35 // This is some crazy simple math here
36 buf[n] = (i%10) + 48;
37 // It's an int, so the last number will be stripped
38 i = i/10;
39 n++;
40 }
41 // Have to do this one more time to ensure we get the last number on
42 // zero-ended ints
43 buf[n] = (i%10) + 48;
44 // Account for the last char
45 n++;
46 // Annnd the null byte
47 buf[n] = '\0';
48
49
50 // Now we have to reverse the digit order, because it was read in right to
51 // left, not left to right (which populating an array requires ltr).
52 int reversen = n - 1;
53 int cursor = 0;
54 // Reverse the order
55 while(buf[cursor] != '\0') {
56 out[reversen] = buf[cursor];
57 cursor++;
58 reversen--;
59 }
60 out[n] = '\0';
61
62 return n;
63 }
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