1 | /*************************************************************************** |
2 | * _ _ ____ _ |
3 | * Project ___| | | | _ \| | |
4 | * / __| | | | |_) | | |
5 | * | (__| |_| | _ <| |___ |
6 | * \___|\___/|_| \_\_____| |
7 | * |
8 | * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al. |
9 | * |
10 | * This software is licensed as described in the file COPYING, which |
11 | * you should have received as part of this distribution. The terms |
12 | * are also available at https://curl.haxx.se/docs/copyright.html. |
13 | * |
14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
15 | * copies of the Software, and permit persons to whom the Software is |
16 | * furnished to do so, under the terms of the COPYING file. |
17 | * |
18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
19 | * KIND, either express or implied. |
20 | * |
21 | ***************************************************************************/ |
22 | |
23 | #include "curl_setup.h" |
24 | |
25 | #include <curl/curl.h> |
26 | |
27 | #include "strcase.h" |
28 | |
29 | /* Portable, consistent toupper (remember EBCDIC). Do not use toupper() because |
30 | its behavior is altered by the current locale. */ |
31 | char Curl_raw_toupper(char in) |
32 | { |
33 | #if !defined(CURL_DOES_CONVERSIONS) |
34 | if(in >= 'a' && in <= 'z') |
35 | return (char)('A' + in - 'a'); |
36 | #else |
37 | switch(in) { |
38 | case 'a': |
39 | return 'A'; |
40 | case 'b': |
41 | return 'B'; |
42 | case 'c': |
43 | return 'C'; |
44 | case 'd': |
45 | return 'D'; |
46 | case 'e': |
47 | return 'E'; |
48 | case 'f': |
49 | return 'F'; |
50 | case 'g': |
51 | return 'G'; |
52 | case 'h': |
53 | return 'H'; |
54 | case 'i': |
55 | return 'I'; |
56 | case 'j': |
57 | return 'J'; |
58 | case 'k': |
59 | return 'K'; |
60 | case 'l': |
61 | return 'L'; |
62 | case 'm': |
63 | return 'M'; |
64 | case 'n': |
65 | return 'N'; |
66 | case 'o': |
67 | return 'O'; |
68 | case 'p': |
69 | return 'P'; |
70 | case 'q': |
71 | return 'Q'; |
72 | case 'r': |
73 | return 'R'; |
74 | case 's': |
75 | return 'S'; |
76 | case 't': |
77 | return 'T'; |
78 | case 'u': |
79 | return 'U'; |
80 | case 'v': |
81 | return 'V'; |
82 | case 'w': |
83 | return 'W'; |
84 | case 'x': |
85 | return 'X'; |
86 | case 'y': |
87 | return 'Y'; |
88 | case 'z': |
89 | return 'Z'; |
90 | } |
91 | #endif |
92 | |
93 | return in; |
94 | } |
95 | |
96 | |
97 | /* Portable, consistent tolower (remember EBCDIC). Do not use tolower() because |
98 | its behavior is altered by the current locale. */ |
99 | char Curl_raw_tolower(char in) |
100 | { |
101 | #if !defined(CURL_DOES_CONVERSIONS) |
102 | if(in >= 'A' && in <= 'Z') |
103 | return (char)('a' + in - 'A'); |
104 | #else |
105 | switch(in) { |
106 | case 'A': |
107 | return 'a'; |
108 | case 'B': |
109 | return 'b'; |
110 | case 'C': |
111 | return 'c'; |
112 | case 'D': |
113 | return 'd'; |
114 | case 'E': |
115 | return 'e'; |
116 | case 'F': |
117 | return 'f'; |
118 | case 'G': |
119 | return 'g'; |
120 | case 'H': |
121 | return 'h'; |
122 | case 'I': |
123 | return 'i'; |
124 | case 'J': |
125 | return 'j'; |
126 | case 'K': |
127 | return 'k'; |
128 | case 'L': |
129 | return 'l'; |
130 | case 'M': |
131 | return 'm'; |
132 | case 'N': |
133 | return 'n'; |
134 | case 'O': |
135 | return 'o'; |
136 | case 'P': |
137 | return 'p'; |
138 | case 'Q': |
139 | return 'q'; |
140 | case 'R': |
141 | return 'r'; |
142 | case 'S': |
143 | return 's'; |
144 | case 'T': |
145 | return 't'; |
146 | case 'U': |
147 | return 'u'; |
148 | case 'V': |
149 | return 'v'; |
150 | case 'W': |
151 | return 'w'; |
152 | case 'X': |
153 | return 'x'; |
154 | case 'Y': |
155 | return 'y'; |
156 | case 'Z': |
157 | return 'z'; |
158 | } |
159 | #endif |
160 | |
161 | return in; |
162 | } |
163 | |
164 | |
165 | /* |
166 | * Curl_strcasecompare() is for doing "raw" case insensitive strings. This is |
167 | * meant to be locale independent and only compare strings we know are safe |
168 | * for this. See |
169 | * https://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for some |
170 | * further explanation to why this function is necessary. |
171 | * |
172 | * The function is capable of comparing a-z case insensitively even for |
173 | * non-ascii. |
174 | * |
175 | * @unittest: 1301 |
176 | */ |
177 | |
178 | int Curl_strcasecompare(const char *first, const char *second) |
179 | { |
180 | while(*first && *second) { |
181 | if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) |
182 | /* get out of the loop as soon as they don't match */ |
183 | break; |
184 | first++; |
185 | second++; |
186 | } |
187 | /* we do the comparison here (possibly again), just to make sure that if the |
188 | loop above is skipped because one of the strings reached zero, we must not |
189 | return this as a successful match */ |
190 | return (Curl_raw_toupper(*first) == Curl_raw_toupper(*second)); |
191 | } |
192 | |
193 | int Curl_safe_strcasecompare(const char *first, const char *second) |
194 | { |
195 | if(first && second) |
196 | /* both pointers point to something then compare them */ |
197 | return Curl_strcasecompare(first, second); |
198 | |
199 | /* if both pointers are NULL then treat them as equal */ |
200 | return (NULL == first && NULL == second); |
201 | } |
202 | |
203 | /* |
204 | * @unittest: 1301 |
205 | */ |
206 | int Curl_strncasecompare(const char *first, const char *second, size_t max) |
207 | { |
208 | while(*first && *second && max) { |
209 | if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) { |
210 | break; |
211 | } |
212 | max--; |
213 | first++; |
214 | second++; |
215 | } |
216 | if(0 == max) |
217 | return 1; /* they are equal this far */ |
218 | |
219 | return Curl_raw_toupper(*first) == Curl_raw_toupper(*second); |
220 | } |
221 | |
222 | /* Copy an upper case version of the string from src to dest. The |
223 | * strings may overlap. No more than n characters of the string are copied |
224 | * (including any NUL) and the destination string will NOT be |
225 | * NUL-terminated if that limit is reached. |
226 | */ |
227 | void Curl_strntoupper(char *dest, const char *src, size_t n) |
228 | { |
229 | if(n < 1) |
230 | return; |
231 | |
232 | do { |
233 | *dest++ = Curl_raw_toupper(*src); |
234 | } while(*src++ && --n); |
235 | } |
236 | |
237 | /* Copy a lower case version of the string from src to dest. The |
238 | * strings may overlap. No more than n characters of the string are copied |
239 | * (including any NUL) and the destination string will NOT be |
240 | * NUL-terminated if that limit is reached. |
241 | */ |
242 | void Curl_strntolower(char *dest, const char *src, size_t n) |
243 | { |
244 | if(n < 1) |
245 | return; |
246 | |
247 | do { |
248 | *dest++ = Curl_raw_tolower(*src); |
249 | } while(*src++ && --n); |
250 | } |
251 | |
252 | /* --- public functions --- */ |
253 | |
254 | int curl_strequal(const char *first, const char *second) |
255 | { |
256 | return Curl_strcasecompare(first, second); |
257 | } |
258 | int curl_strnequal(const char *first, const char *second, size_t max) |
259 | { |
260 | return Curl_strncasecompare(first, second, max); |
261 | } |
262 | |