1 /*
2 * Copyright © 2016 Samsung Electronics Co., Ltd
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the
13 * next paragraph) shall be included in all copies or substantial
14 * portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26 #ifndef WESTON_STRING_HELPERS_H
27 #define WESTON_STRING_HELPERS_H
28
29 #include <stdbool.h>
30 #include <stdlib.h>
31 #include <stdint.h>
32 #include <errno.h>
33 #include <assert.h>
34
35 /* Convert string to integer
36 *
37 * Parses a base-10 number from the given string. Checks that the
38 * string is not blank, contains only numerical characters, and is
39 * within the range of INT32_MIN to INT32_MAX. If the validation is
40 * successful the result is stored in *value; otherwise *value is
41 * unchanged and errno is set appropriately.
42 *
43 * \return true if the number parsed successfully, false on error
44 */
45 static inline bool
safe_strtoint(const char * str,int32_t * value)46 safe_strtoint(const char *str, int32_t *value)
47 {
48 long ret;
49 char *end;
50
51 assert(str != NULL);
52
53 errno = 0;
54 ret = strtol(str, &end, 10);
55 if (errno != 0) {
56 return false;
57 } else if (end == str || *end != '\0') {
58 errno = EINVAL;
59 return false;
60 }
61
62 if ((long)((int32_t)ret) != ret) {
63 errno = ERANGE;
64 return false;
65 }
66 *value = (int32_t)ret;
67
68 return true;
69 }
70
71 #endif /* WESTON_STRING_HELPERS_H */
72