87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/**
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* @file LexMemoryBufferInput.h
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Object that can be used by a lexer to read input from a memory buffer.
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*/
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#ifndef BADVPN_PREDICATE_LEXMEMORYBUFFERINPUT_H
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#define BADVPN_PREDICATE_LEXMEMORYBUFFERINPUT_H
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#include <string.h>
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#include <misc/debug.h>
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typedef struct {
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char *buf;
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int len;
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int pos;
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int error;
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} LexMemoryBufferInput;
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static void LexMemoryBufferInput_Init (LexMemoryBufferInput *input, char *buf, int len)
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{
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input->buf = buf;
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input->len = len;
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input->pos = 0;
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input->error = 0;
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}
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static int LexMemoryBufferInput_Read (LexMemoryBufferInput *input, char *dest, int len)
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{
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ASSERT(dest)
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ASSERT(len > 0)
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if (input->pos >= input->len) {
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return 0;
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}
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int to_read = input->len - input->pos;
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if (to_read > len) {
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to_read = len;
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}
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memcpy(dest, input->buf + input->pos, to_read);
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input->pos += to_read;
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return to_read;
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}
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static void LexMemoryBufferInput_SetError (LexMemoryBufferInput *input)
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{
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input->error = 1;
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}
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static int LexMemoryBufferInput_HasError (LexMemoryBufferInput *input)
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{
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return input->error;
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}
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#endif
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