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yap-6.3/library/lammpi/prologterms2c.h

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/*
Copyright (C) 2004,2005,2006 (Nuno A. Fonseca) <nuno.fonseca@gmail.com>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Last rev: $Id: prologterms2c.h,v 1.2 2006-06-04 19:02:07 nunofonseca Exp $
Comments: This file provides a set of functions to convert a prolog term to a C string and back.
*/
#ifndef PROLOGTERMS2C
#define PROLOGTERMS2C 1
#ifndef _yap_c_interface_h
#include <YapInterface.h>
//#include <yap_structs.h>
#endif
#ifndef size_t
#include <unistd.h>
#endif
#include <stdarg.h>
/*
* Converts a term t into a string.
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* An internal representation of t is
* copied to ptr if it occupies less than size. Otherwise the
* necessary memory is aloccated (dyn_ptr) and the ascii
* representation of the term is copied to there.
*/
char* term2string(char *const ptr,size_t *size, const YAP_Term t);
/*
* Converts a string with a ascci representation of a term into a term.
* The ascii representation of t is
* copied to ptr if it occupies less than *size. Otherwise the
* necessary memory is aloccated and the ascii
* representation of the term is copied to there.
*/
YAP_Term string2term(char *const ptr,const size_t *size);
/*
* Read a prolog term from a stream
* (the prolog term must have been writen by the write_term_to_stream)
*/
YAP_Term read_term_from_stream(const int fd);
/*
* Writes a term to a stream.
*/
size_t write_term_to_stream(const int fd,const YAP_Term term);
/*
* Changes the size of the buffer to contain at least newsize bytes.
* Useful to reduce the number of reallocs,mallocs, and frees
*/
void change_buffer_size(const size_t newsize);
void write_msg(const char *fun,const char *file, int line,const char *format, ...);
/*********************************************************************************************
* Macros to manipulate the buffer
*********************************************************************************************/
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extern int BLOCK_SIZE;
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#define buffer (buffers[YAP_ThreadSelf()])
// deletes the buffer (all fields) but does not release the memory of the buffer.ptr
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#define DEL_BUFFER {buffer.ptr=NULL;buffer.size=0;buffer.len=0;buffer.pos=0;}
// informs the prologterm2c module that the buffer is now used and should not be messed
#define USED_BUFFER() DEL_BUFFER
// initialize buffer
#define RESET_BUFFER {buffer.len=0;change_buffer_size(BLOCK_SIZE);buffer.pos=0;}
#define BUFFER_PTR buffer.ptr
#define BUFFER_SIZE buffer.size
#define BUFFER_LEN buffer.len
#define BUFFER_POS buffer.pos
// copies two buffers
#define COPY_BUFFER_DS(src,dst) {dst.size=src.size;dst.len=src.len;dst.ptr=src.ptr;dst.pos=src.pos;}
/*********************************************************************************************
* Buffer
*********************************************************************************************/
struct buffer_ds {
size_t size, // size of the buffer
len; // size of the string
char *ptr; // pointer to the buffer
size_t pos; // position (used while reading)
};
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extern struct buffer_ds buffers[1024];
#endif