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3719602c PC |
1 | /* Copyright (C) 2010-2020 The RetroArch team |
2 | * | |
3 | * --------------------------------------------------------------------------------------- | |
4 | * The following license statement only applies to this file (compat_strcasestr.c). | |
5 | * --------------------------------------------------------------------------------------- | |
6 | * | |
7 | * Permission is hereby granted, free of charge, | |
8 | * to any person obtaining a copy of this software and associated documentation files (the "Software"), | |
9 | * to deal in the Software without restriction, including without limitation the rights to | |
10 | * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
11 | * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
14 | * | |
15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, | |
16 | * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
18 | * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
19 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
21 | */ | |
22 | ||
23 | #include <ctype.h> | |
24 | ||
25 | #include <compat/strcasestr.h> | |
26 | ||
27 | /* Pretty much strncasecmp. */ | |
28 | static int casencmp(const char *a, const char *b, size_t n) | |
29 | { | |
30 | size_t i; | |
31 | ||
32 | for (i = 0; i < n; i++) | |
33 | { | |
34 | int a_lower = tolower(a[i]); | |
35 | int b_lower = tolower(b[i]); | |
36 | if (a_lower != b_lower) | |
37 | return a_lower - b_lower; | |
38 | } | |
39 | ||
40 | return 0; | |
41 | } | |
42 | ||
43 | char *strcasestr_retro__(const char *haystack, const char *needle) | |
44 | { | |
45 | size_t i, search_off; | |
46 | size_t hay_len = strlen(haystack); | |
47 | size_t needle_len = strlen(needle); | |
48 | ||
49 | if (needle_len > hay_len) | |
50 | return NULL; | |
51 | ||
52 | search_off = hay_len - needle_len; | |
53 | for (i = 0; i <= search_off; i++) | |
54 | if (!casencmp(haystack + i, needle, needle_len)) | |
55 | return (char*)haystack + i; | |
56 | ||
57 | return NULL; | |
58 | } |