tor-android/external/badvpn_dns/predicate/LexMemoryBufferInput.h

87 lines
2.7 KiB
C

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