248 lines
7.2 KiB
C
248 lines
7.2 KiB
C
/*
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Copyright (C) 2004,2005,2006 (Nuno A. Fonseca) <nuno.fonseca@gmail.com>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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Last rev: $Id: prologterms2c.c,v 1.4 2006-09-28 11:42:51 vsc Exp $
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Comments: This file provides a set of functions to convert a prolog term to a C string and back.
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*/
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#include "config.h"
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#include "prologterms2c.h"
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#include <stdio.h>
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#include <stdlib.h>
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#if HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#if HAVE_MALLOC_H
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#include <malloc.h>
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#endif
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#ifdef COMPRESS
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#include "minilzo.h"
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#endif
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#ifndef Quote_illegal_f
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#define Quote_illegal_f 1
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#define Ignore_ops_f 2
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#define Handle_vars_f 4
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#define Use_portray_f 8
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#define To_heap_f 16
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#endif
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#ifdef COMPRESS
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#endif
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struct buffer_ds buffer;
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/*********************************************************************************************/
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// prototypes
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void write_msg(const char *fun,const char *file, int line,const char *format, ...);
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size_t write_term_to_stream(const int fd,const YAP_Term term);
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YAP_Term read_term_from_stream(const int fd);
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/*********************************************************************************************/
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/*
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* Writes a debug message containing the processid, function name, filename, line, and a user message
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*/
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void
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write_msg(const char *fun,const char *file, int line,
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const char *format, ...) {
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va_list ap;
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va_start(ap, format);
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/* Print the message to stderr */
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fprintf(stderr,
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"[%d:%s in %s at line %d] ", getpid(),fun, file, line);
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vfprintf(stderr, format, ap);
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va_end(ap);
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}
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/*********************************************************************************************
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* Memory handling functions
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*********************************************************************************************/
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/*
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* Adds 'space' to the size of the currently allocated buffer
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*/
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static void
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expand_buffer(const size_t space ) {
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char *oldblock;
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// BUFFER_PTR = realloc( BUFFER_PTR, BUFFER_SIZE + space );
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oldblock= BUFFER_PTR;
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BUFFER_PTR = (char*)malloc( BUFFER_SIZE + space );
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if( BUFFER_PTR == NULL ) {
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YAP_Error(0,0,"Prolog2Term: Out of memory.\n");
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#ifdef MPI
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MPI_Finalize();
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#endif
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YAP_Exit( 1 );
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}
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memcpy(BUFFER_PTR,oldblock,BUFFER_SIZE);
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if(oldblock!=NULL)
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free(oldblock);
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BUFFER_SIZE+=space;
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}
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/*
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* Changes the size of the buffer to contain at least newsize bytes
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*/
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void
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change_buffer_size(const size_t newsize) {
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if ( BUFFER_SIZE>=BLOCK_SIZE && BUFFER_SIZE>newsize)
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return;
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if(BUFFER_PTR!=NULL)
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free(BUFFER_PTR);
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BUFFER_PTR = (char*)malloc(newsize);
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if( BUFFER_PTR == NULL ) {
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YAP_Error(0,0,"Prolog2Term: Out of memory.\n");
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#ifdef MPI
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MPI_Finalize();
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#endif
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YAP_Exit( 1 );
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}
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BUFFER_SIZE=newsize;
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}
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/*********************************************************************************************
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* I/O functions
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*********************************************************************************************/
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/*
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* Function used by YAP to write a char to a string
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*/
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static void
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p2c_putc(const int c) {
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// if( buffer.size==buffer.len+1 )
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if( BUFFER_SIZE==BUFFER_LEN ) {
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#ifdef DEBUG
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write_msg(__FUNCTION__,__FILE__,__LINE__,"p2c_putc:buffer expanded: size=%u pos=%u len=%u\n",BUFFER_SIZE,BUFFER_POS,BUFFER_LEN);
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#endif
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expand_buffer( BLOCK_SIZE );
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}
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BUFFER_PTR[BUFFER_LEN++] = c;
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}
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/*
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* Function used by YAP to read a char from a string
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*/
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/*
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* Writes a term to a stream.
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*/
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size_t
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write_term_to_stream(const int fd,const YAP_Term term) {
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RESET_BUFFER;
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YAP_Write( term, p2c_putc, 3); // 3=canonical
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if (write(fd,(void*)&BUFFER_LEN,sizeof(size_t)) < 0) {// write size of term
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YAP_Error(0,0,"Prolog2Term: IO error in write term size.\n");
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return -1;
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}
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if (write(fd,(void*)BUFFER_PTR,BUFFER_LEN) < 0) { // write term
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YAP_Error(0,0,"Prolog2Term: IO error in write.\n");
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return -1;
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}
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return BUFFER_LEN;
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}
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/*
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* Read a prolog term from a stream
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* (the prolog term must have been writen by the write_term_to_stream)
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*/
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YAP_Term
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read_term_from_stream(const int fd) {
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size_t size;
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RESET_BUFFER;
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read(fd,(void*)&size,sizeof(size_t)); // read the size of the term
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#ifdef DEBUG
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write_msg(__FUNCTION__,__FILE__,__LINE__,"read_term_from_stream>>>>size:%d\n",size);
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#endif
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if ( size> BUFFER_SIZE)
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expand_buffer(size-BUFFER_SIZE);
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if (!read(fd,BUFFER_PTR,size)) {
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YAP_Error(0,0,"Prolog2Term: IO error in read.\n");
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}; // read term from stream
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return YAP_ReadBuffer( BUFFER_PTR , NULL);
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}
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/*********************************************************************************************
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* Conversion: Prolog Term->char[] and char[]->Prolog Term
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*********************************************************************************************/
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/*
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* Converts a term t into a string.
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* The ascii representation of t is
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* copied to ptr if it occupies less than size.
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*/
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char*
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term2string(char *const ptr,size_t *size, const YAP_Term t) {
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char *ret;
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RESET_BUFFER;
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YAP_Write( t, p2c_putc, 3 );// canonical
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p2c_putc('\0'); //add terminator
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if (BUFFER_LEN<=*size) { // user allocated buffer size is ok
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memcpy(ptr,BUFFER_PTR,BUFFER_LEN); // copy data to user block
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ret=ptr;
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*size=BUFFER_LEN;
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} else { // user buffer is too small
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ret=BUFFER_PTR;
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*size=BUFFER_LEN;
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//DEL_BUFFER;
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}
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return ret;
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}
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/*
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* Converts a string with a ascci representation of a term into a Prolog term.
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*/
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YAP_Term
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string2term(char *const ptr,const size_t *size) {
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YAP_Term t;
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struct buffer_ds b;
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b.size=b.len=b.pos=0;
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if (BUFFER_PTR!=ptr) { //
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#ifdef DEBUG
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write_msg(__FUNCTION__,__FILE__,__LINE__,"copy buffer string2term\n");
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#endif
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COPY_BUFFER_DS(buffer,b); // keep a copy of buffer_ds
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BUFFER_PTR=ptr; // make the buffer use the buffer provided
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BUFFER_LEN=*size;
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BUFFER_SIZE=BUFFER_LEN;
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} else { // b aux. struct. not needed
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b.ptr=NULL;
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}
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BUFFER_POS=0;
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t = YAP_ReadBuffer( BUFFER_PTR , NULL );
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if ( t==FALSE ) {
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write_msg(__FUNCTION__,__FILE__,__LINE__,"FAILED string2term>>>>size:%d %d %s\n",BUFFER_SIZE,strlen(BUFFER_PTR),NULL);
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exit(1);
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}
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if (b.ptr!=NULL)
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COPY_BUFFER_DS(b,buffer);
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#ifdef DEBUG
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write_msg(__FUNCTION__,__FILE__,__LINE__,"ending: buffer(ptr=%p;size=%d;pos=%d;len=%d)\n",BUFFER_PTR,BUFFER_SIZE,BUFFER_POS,BUFFER_LEN);
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#endif
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return t;
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}
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