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1 office 1 /**
2 * @file memref.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  
30 #ifndef BADVPN_MEMREF_H
31 #define BADVPN_MEMREF_H
32  
33 #include <stddef.h>
34 #include <string.h>
35 #include <limits.h>
36  
37 #include <misc/debug.h>
38 #include <misc/balloc.h>
39 #include <misc/strdup.h>
40  
41 typedef struct {
42 char const *ptr;
43 size_t len;
44 } MemRef;
45  
46 static MemRef MemRef_Make (char const *ptr, size_t len);
47 static MemRef MemRef_MakeCstr (char const *ptr);
48 static char MemRef_At (MemRef o, size_t pos);
49 static void MemRef_AssertRange (MemRef o, size_t offset, size_t length);
50 static MemRef MemRef_SubFrom (MemRef o, size_t offset);
51 static MemRef MemRef_SubTo (MemRef o, size_t length);
52 static MemRef MemRef_Sub (MemRef o, size_t offset, size_t length);
53 static char * MemRef_StrDup (MemRef o);
54 static void MemRef_CopyOut (MemRef o, char *out);
55 static int MemRef_Equal (MemRef o, MemRef other);
56 static int MemRef_FindChar (MemRef o, char ch, size_t *out_index);
57  
58 #define MEMREF_LOOP_CHARS__BODY(char_rel_pos_var, char_var, body) \
59 { \
60 for (size_t char_rel_pos_var = 0; char_rel_pos_var < MemRef__Loop_length; char_rel_pos_var++) { \
61 char char_var = MemRef__Loop_o.ptr[MemRef__Loop_offset + char_rel_pos_var]; \
62 { body } \
63 } \
64 }
65  
66 #define MEMREF_LOOP_CHARS_RANGE(o, offset, length, char_rel_pos_var, char_var, body) \
67 { \
68 MemRef MemRef__Loop_o = (o); \
69 size_t MemRef__Loop_offset = (offset); \
70 size_t MemRef__Loop_length = (length); \
71 MEMREF_LOOP_CHARS__BODY(char_rel_pos_var, char_var, body) \
72 }
73  
74 #define MEMREF_LOOP_CHARS(o, char_rel_pos_var, char_var, body) \
75 { \
76 MemRef MemRef__Loop_o = (o); \
77 size_t MemRef__Loop_offset = 0; \
78 size_t MemRef__Loop_length = MemRef__Loop_o.len; \
79 MEMREF_LOOP_CHARS__BODY(char_rel_pos_var, char_var, body) \
80 }
81  
82 //
83  
84 static MemRef MemRef_Make (char const *ptr, size_t len)
85 {
86 MemRef res;
87 res.ptr = ptr;
88 res.len = len;
89 return res;
90 }
91  
92 static MemRef MemRef_MakeCstr (char const *ptr)
93 {
94 ASSERT(ptr)
95  
96 return MemRef_Make(ptr, strlen(ptr));
97 }
98  
99 static char MemRef_At (MemRef o, size_t pos)
100 {
101 ASSERT(o.ptr)
102 ASSERT(pos < o.len)
103  
104 return o.ptr[pos];
105 }
106  
107 static void MemRef_AssertRange (MemRef o, size_t offset, size_t length)
108 {
109 ASSERT(offset <= o.len)
110 ASSERT(length <= o.len - offset)
111 }
112  
113 static MemRef MemRef_SubFrom (MemRef o, size_t offset)
114 {
115 ASSERT(o.ptr)
116 ASSERT(offset <= o.len)
117  
118 return MemRef_Make(o.ptr + offset, o.len - offset);
119 }
120  
121 static MemRef MemRef_SubTo (MemRef o, size_t length)
122 {
123 ASSERT(o.ptr)
124 ASSERT(length <= o.len)
125  
126 return MemRef_Make(o.ptr, length);
127 }
128  
129 static MemRef MemRef_Sub (MemRef o, size_t offset, size_t length)
130 {
131 ASSERT(o.ptr)
132 MemRef_AssertRange(o, offset, length);
133  
134 return MemRef_Make(o.ptr + offset, length);
135 }
136  
137 static char * MemRef_StrDup (MemRef o)
138 {
139 ASSERT(o.ptr)
140  
141 return b_strdup_bin(o.ptr, o.len);
142 }
143  
144 static void MemRef_CopyOut (MemRef o, char *out)
145 {
146 ASSERT(o.ptr)
147 ASSERT(out)
148  
149 memcpy(out, o.ptr, o.len);
150 }
151  
152 static int MemRef_Equal (MemRef o, MemRef other)
153 {
154 ASSERT(o.ptr)
155 ASSERT(other.ptr)
156  
157 return (o.len == other.len) && !memcmp(o.ptr, other.ptr, o.len);
158 }
159  
160 static int MemRef_FindChar (MemRef o, char ch, size_t *out_index)
161 {
162 ASSERT(o.ptr)
163  
164 for (size_t i = 0; i < o.len; i++) {
165 if (o.ptr[i] == ch) {
166 if (out_index) {
167 *out_index = i;
168 }
169 return 1;
170 }
171 }
172 return 0;
173 }
174  
175 #endif