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1 office 1 /**
2 * @file LexMemoryBufferInput.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 * Object that can be used by a lexer to read input from a memory buffer.
32 */
33  
34 #ifndef BADVPN_PREDICATE_LEXMEMORYBUFFERINPUT_H
35 #define BADVPN_PREDICATE_LEXMEMORYBUFFERINPUT_H
36  
37 #include <string.h>
38  
39 #include <misc/debug.h>
40  
41 typedef struct {
42 char *buf;
43 int len;
44 int pos;
45 int error;
46 } LexMemoryBufferInput;
47  
48 static void LexMemoryBufferInput_Init (LexMemoryBufferInput *input, char *buf, int len)
49 {
50 input->buf = buf;
51 input->len = len;
52 input->pos = 0;
53 input->error = 0;
54 }
55  
56 static int LexMemoryBufferInput_Read (LexMemoryBufferInput *input, char *dest, int len)
57 {
58 ASSERT(dest)
59 ASSERT(len > 0)
60  
61 if (input->pos >= input->len) {
62 return 0;
63 }
64  
65 int to_read = input->len - input->pos;
66 if (to_read > len) {
67 to_read = len;
68 }
69  
70 memcpy(dest, input->buf + input->pos, to_read);
71 input->pos += to_read;
72  
73 return to_read;
74 }
75  
76 static void LexMemoryBufferInput_SetError (LexMemoryBufferInput *input)
77 {
78 input->error = 1;
79 }
80  
81 static int LexMemoryBufferInput_HasError (LexMemoryBufferInput *input)
82 {
83 return input->error;
84 }
85  
86 #endif