1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, 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. */
Curl_raw_toupper(char in)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 * Curl_raw_equal() is for doing "raw" case insensitive strings. This is meant
98 * to be locale independent and only compare strings we know are safe for
99 * this. See https://daniel.haxx.se/blog/2008/10/15/strcasecmp-in-turkish/ for
100 * some further explanation to why this function is necessary.
101 *
102 * The function is capable of comparing a-z case insensitively even for
103 * non-ascii.
104 *
105 * @unittest: 1301
106 */
107
Curl_strcasecompare(const char * first,const char * second)108 int Curl_strcasecompare(const char *first, const char *second)
109 {
110 while(*first && *second) {
111 if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second))
112 /* get out of the loop as soon as they don't match */
113 break;
114 first++;
115 second++;
116 }
117 /* we do the comparison here (possibly again), just to make sure that if the
118 loop above is skipped because one of the strings reached zero, we must not
119 return this as a successful match */
120 return (Curl_raw_toupper(*first) == Curl_raw_toupper(*second));
121 }
122
Curl_safe_strcasecompare(const char * first,const char * second)123 int Curl_safe_strcasecompare(const char *first, const char *second)
124 {
125 if(first && second)
126 /* both pointers point to something then compare them */
127 return Curl_strcasecompare(first, second);
128 else
129 /* if both pointers are NULL then treat them as equal */
130 return (NULL == first && NULL == second);
131 }
132
133 /*
134 * @unittest: 1301
135 */
Curl_strncasecompare(const char * first,const char * second,size_t max)136 int Curl_strncasecompare(const char *first, const char *second, size_t max)
137 {
138 while(*first && *second && max) {
139 if(Curl_raw_toupper(*first) != Curl_raw_toupper(*second)) {
140 break;
141 }
142 max--;
143 first++;
144 second++;
145 }
146 if(0 == max)
147 return 1; /* they are equal this far */
148
149 return Curl_raw_toupper(*first) == Curl_raw_toupper(*second);
150 }
151
152 /* Copy an upper case version of the string from src to dest. The
153 * strings may overlap. No more than n characters of the string are copied
154 * (including any NUL) and the destination string will NOT be
155 * NUL-terminated if that limit is reached.
156 */
Curl_strntoupper(char * dest,const char * src,size_t n)157 void Curl_strntoupper(char *dest, const char *src, size_t n)
158 {
159 if(n < 1)
160 return;
161
162 do {
163 *dest++ = Curl_raw_toupper(*src);
164 } while(*src++ && --n);
165 }
166
167 /* --- public functions --- */
168
curl_strequal(const char * first,const char * second)169 int curl_strequal(const char *first, const char *second)
170 {
171 return Curl_strcasecompare(first, second);
172 }
curl_strnequal(const char * first,const char * second,size_t max)173 int curl_strnequal(const char *first, const char *second, size_t max)
174 {
175 return Curl_strncasecompare(first, second, max);
176 }
177