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1 office 1 /**
2 * @file string_begins_with.h
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * @section DESCRIPTION
30 *
31 * Function for checking if a string begins with a given string.
32 */
33  
34 #ifndef BADVPN_MISC_STRING_BEGINS_WITH
35 #define BADVPN_MISC_STRING_BEGINS_WITH
36  
37 #include <stddef.h>
38 #include <string.h>
39  
40 #include <misc/debug.h>
41  
42 static size_t data_begins_with (const char *str, size_t str_len, const char *needle)
43 {
44 ASSERT(strlen(needle) > 0)
45  
46 size_t len = 0;
47  
48 while (str_len > 0 && *needle) {
49 if (*str != *needle) {
50 return 0;
51 }
52 str++;
53 str_len--;
54 needle++;
55 len++;
56 }
57  
58 if (*needle) {
59 return 0;
60 }
61  
62 return len;
63 }
64  
65 static size_t string_begins_with (const char *str, const char *needle)
66 {
67 ASSERT(strlen(needle) > 0)
68  
69 return data_begins_with(str, strlen(str), needle);
70 }
71  
72 static size_t data_begins_with_bin (const char *str, size_t str_len, const char *needle, size_t needle_len)
73 {
74 ASSERT(needle_len > 0)
75  
76 size_t len = 0;
77  
78 while (str_len > 0 && needle_len > 0) {
79 if (*str != *needle) {
80 return 0;
81 }
82 str++;
83 str_len--;
84 needle++;
85 needle_len--;
86 len++;
87 }
88  
89 if (needle_len > 0) {
90 return 0;
91 }
92  
93 return len;
94 }
95  
96 #endif