1 /* SPDX-License-Identifier: MIT */
2
3 /*
4 * Copyright © 2005-2014 Rich Felker, et al.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
21 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26 /* From: http://fossies.org/dox/musl-1.0.5/atoi_8c_source.html */
27
28 #include <stdlib.h>
29 #include <ctype.h>
30
atoi(const char * s)31 int atoi(const char *s)
32 {
33 int n = 0;
34 int neg = 0;
35
36 while (isspace((unsigned char)*s) != 0) {
37 s++;
38 }
39 switch (*s) {
40 case '-':
41 neg = 1;
42 s++;
43 break; /* artifact to quiet coverity warning */
44 case '+':
45 s++;
46 break;
47 default:
48 /* Add an empty default with break, this is a defensive programming.
49 * Static analysis tool won't raise a violation if default is empty,
50 * but has that comment.
51 */
52 break;
53 }
54 /* Compute n as a negative number to avoid overflow on INT_MIN */
55 while (isdigit((unsigned char)*s) != 0) {
56 n = 10*n - (*s++ - '0');
57 }
58 return neg ? n : -n;
59 }
60
