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yap-6.3/library/lammpi/prologterms2c.c

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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.c,v 1.4 2006-09-28 11:42:51 vsc Exp $
Comments: This file provides a set of functions to convert a prolog term to a C string and back.
*/
#include "config.h"
#include "prologterms2c.h"
#include <stdio.h>
#include <stdlib.h>
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#if HAVE_MALLOC_H
#include <malloc.h>
#endif
#ifdef COMPRESS
#include "minilzo.h"
#endif
#ifndef Quote_illegal_f
#define Quote_illegal_f 1
#define Ignore_ops_f 2
#define Handle_vars_f 4
#define Use_portray_f 8
#define To_heap_f 16
#endif
#ifdef COMPRESS
#endif
struct buffer_ds buffer;
/*********************************************************************************************/
// prototypes
void write_msg(const char *fun,const char *file, int line,const char *format, ...);
size_t write_term_to_stream(const int fd,const YAP_Term term);
YAP_Term read_term_from_stream(const int fd);
/*********************************************************************************************/
/*
* Writes a debug message containing the processid, function name, filename, line, and a user message
*/
void
write_msg(const char *fun,const char *file, int line,
const char *format, ...) {
va_list ap;
va_start(ap, format);
/* Print the message to stderr */
fprintf(stderr,
"[%d:%s in %s at line %d] ", getpid(),fun, file, line);
vfprintf(stderr, format, ap);
va_end(ap);
}
/*********************************************************************************************
* Memory handling functions
*********************************************************************************************/
/*
* Adds 'space' to the size of the currently allocated buffer
*/
static void
expand_buffer(const size_t space ) {
char *oldblock;
// BUFFER_PTR = realloc( BUFFER_PTR, BUFFER_SIZE + space );
oldblock= BUFFER_PTR;
BUFFER_PTR = (char*)malloc( BUFFER_SIZE + space );
if( BUFFER_PTR == NULL ) {
YAP_Error(0,0,"Prolog2Term: Out of memory.\n");
#ifdef MPI
MPI_Finalize();
#endif
YAP_Exit( 1 );
}
memcpy(BUFFER_PTR,oldblock,BUFFER_SIZE);
if(oldblock!=NULL)
free(oldblock);
BUFFER_SIZE+=space;
}
/*
* Changes the size of the buffer to contain at least newsize bytes
*/
void
change_buffer_size(const size_t newsize) {
if ( BUFFER_SIZE>=BLOCK_SIZE && BUFFER_SIZE>newsize)
return;
if(BUFFER_PTR!=NULL)
free(BUFFER_PTR);
BUFFER_PTR = (char*)malloc(newsize);
if( BUFFER_PTR == NULL ) {
YAP_Error(0,0,"Prolog2Term: Out of memory.\n");
#ifdef MPI
MPI_Finalize();
#endif
YAP_Exit( 1 );
}
BUFFER_SIZE=newsize;
}
/*********************************************************************************************
* I/O functions
*********************************************************************************************/
/*
* Function used by YAP to write a char to a string
*/
static void
p2c_putc(const int c) {
// if( buffer.size==buffer.len+1 )
if( BUFFER_SIZE==BUFFER_LEN ) {
#ifdef DEBUG
write_msg(__FUNCTION__,__FILE__,__LINE__,"p2c_putc:buffer expanded: size=%u pos=%u len=%u\n",BUFFER_SIZE,BUFFER_POS,BUFFER_LEN);
#endif
expand_buffer( BLOCK_SIZE );
}
BUFFER_PTR[BUFFER_LEN++] = c;
}
/*
* Function used by YAP to read a char from a string
*/
/*
* Writes a term to a stream.
*/
size_t
write_term_to_stream(const int fd,const YAP_Term term) {
RESET_BUFFER;
YAP_Write( term, p2c_putc,3); // 3=canonical
write(fd,(void*)&BUFFER_LEN,sizeof(size_t));// write size of term
write(fd,(void*)BUFFER_PTR,BUFFER_LEN); // write term
return BUFFER_LEN;
}
/*
* 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) {
size_t size;
RESET_BUFFER;
read(fd,(void*)&size,sizeof(size_t)); // read the size of the term
#ifdef DEBUG
write_msg(__FUNCTION__,__FILE__,__LINE__,"read_term_from_stream>>>>size:%d\n",size);
#endif
if ( size> BUFFER_SIZE)
expand_buffer(size-BUFFER_SIZE);
read(fd,BUFFER_PTR,size); // read term from stream
return YAP_ReadBuffer( BUFFER_PTR , NULL);
}
/*********************************************************************************************
* Conversion: Prolog Term->char[] and char[]->Prolog Term
*********************************************************************************************/
/*
* Converts a term t into a string.
* The ascii representation of t is
* copied to ptr if it occupies less than size.
*/
char*
term2string(char *const ptr,size_t *size, const YAP_Term t) {
char *ret;
RESET_BUFFER;
YAP_Write( t, p2c_putc, 3 );// canonical
p2c_putc('\0'); //add terminator
if (BUFFER_LEN<=*size) { // user allocated buffer size is ok
memcpy(ptr,BUFFER_PTR,BUFFER_LEN); // copy data to user block
ret=ptr;
*size=BUFFER_LEN;
} else { // user buffer is too small
ret=BUFFER_PTR;
*size=BUFFER_LEN;
//DEL_BUFFER;
}
return ret;
}
/*
* Converts a string with a ascci representation of a term into a Prolog term.
*/
YAP_Term
string2term(char *const ptr,const size_t *size) {
YAP_Term t;
struct buffer_ds b;
b.size=b.len=b.pos=0;
if (BUFFER_PTR!=ptr) { //
#ifdef DEBUG
write_msg(__FUNCTION__,__FILE__,__LINE__,"copy buffer string2term\n");
#endif
COPY_BUFFER_DS(buffer,b); // keep a copy of buffer_ds
BUFFER_PTR=ptr; // make the buffer use the buffer provided
BUFFER_LEN=*size;
BUFFER_SIZE=BUFFER_LEN;
} else { // b aux. struct. not needed
b.ptr=NULL;
}
BUFFER_POS=0;
LOCAL_ErrorMessage=NULL;
t = YAP_ReadBuffer( BUFFER_PTR , NULL );
if ( t==FALSE ) {
write_msg(__FUNCTION__,__FILE__,__LINE__,"FAILED string2term>>>>size:%d %d %s\n",BUFFER_SIZE,strlen(BUFFER_PTR),LOCAL_ErrorMessage);
exit(1);
}
if (b.ptr!=NULL)
COPY_BUFFER_DS(b,buffer);
#ifdef DEBUG
write_msg(__FUNCTION__,__FILE__,__LINE__,"ending: buffer(ptr=%p;size=%d;pos=%d;len=%d)\n",BUFFER_PTR,BUFFER_SIZE,BUFFER_POS,BUFFER_LEN);
#endif
return t;
}