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484 lines
14 KiB
C
484 lines
14 KiB
C
/* Implement Input/Output runtime actions for CHILL.
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Copyright (C) 1992,1993 Free Software Foundation, Inc.
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Author: Wilfried Moser, et al
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include "fileio.h"
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#ifndef PATH_MAX
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# ifdef _POSIX_PATH_MAX
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# define PATH_MAX _POSIX_PATH_MAX
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# else
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# ifdef MAXPATHLEN
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# define PATH_MAX MAXPATHLEN
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# else
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# define PATH_MAX 1024
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# endif
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# endif
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#endif
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static
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void
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GetSetAttributes( Association_Mode* the_assoc )
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{
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struct stat statbuf;
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int retco;
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if( (retco = stat( the_assoc->pathname, &statbuf )) )
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return;
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if( S_ISREG(statbuf.st_mode) )
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{
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SET_FLAG( the_assoc, IO_EXISTING );
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if( !TEST_FLAG( the_assoc, IO_VARIABLE ) )
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SET_FLAG( the_assoc, IO_INDEXABLE );
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}
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else
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if( S_ISCHR(statbuf.st_mode) || S_ISFIFO(statbuf.st_mode) )
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{
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SET_FLAG( the_assoc, IO_EXISTING );
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CLR_FLAG( the_assoc, IO_INDEXABLE );
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}
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SET_FLAG( the_assoc, IO_SEQUENCIBLE );
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/* FIXME: File size and computation of number of records for outoffile ? */
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if( !access( the_assoc->pathname, R_OK ) )
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SET_FLAG( the_assoc, IO_READABLE );
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if( !access( the_assoc->pathname, W_OK ) )
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SET_FLAG( the_assoc, IO_WRITEABLE );
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}
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static
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void
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makeName( Association_Mode* the_assoc, char* the_path, int the_path_len,
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char* file, int line)
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{
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int namlen;
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if( ! the_assoc->pathname &&
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! (the_assoc->pathname = (char*)malloc( PATH_MAX )) )
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CHILLEXCEPTION( file, line, SPACEFAIL, PATHNAME_ALLOC );
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if( the_path[0] != DIRSEP )
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{
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if( !getcwd( the_assoc->pathname, PATH_MAX ) )
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{
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the_assoc->syserrno = errno;
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CHILLEXCEPTION( file, line, ASSOCIATEFAIL, GETCWD_FAILS );
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}
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namlen = strlen( the_assoc->pathname );
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the_assoc->pathname[namlen++] = DIRSEP;
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}
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else
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namlen = 0;
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strncpy( the_assoc->pathname + namlen, the_path, the_path_len );
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the_assoc->pathname[namlen+the_path_len] = '\0';
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}
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/*
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* ASSOCIATE
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*/
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/* Caution: returns an Association mode location (!) */
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Association_Mode*
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__associate( Association_Mode* the_assoc,
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char* the_path,
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int the_path_len,
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char* the_mode,
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int the_mode_len,
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char* file,
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int line )
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{
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if( !the_assoc )
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CHILLEXCEPTION( file, line, EMPTY, NULL_ASSOCIATION );
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if( TEST_FLAG(the_assoc, IO_ISASSOCIATED) )
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CHILLEXCEPTION( file, line, ASSOCIATEFAIL, IS_ASSOCIATED );
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/* clear all flags */
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the_assoc->flags = 0;
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if( ! the_path_len )
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CHILLEXCEPTION( file, line, ASSOCIATEFAIL, NO_PATH_NAME );
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makeName( the_assoc, the_path, the_path_len, file, line );
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GetSetAttributes( the_assoc );
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CLR_FLAG( the_assoc, IO_VARIABLE );
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if ( the_mode )
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{
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if( !strncmp( the_mode, "VARIABLE", 8 ) )
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{
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SET_FLAG( the_assoc, IO_VARIABLE );
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CLR_FLAG( the_assoc, IO_INDEXABLE );
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}
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else
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if( strlen( the_mode ) )
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CHILLEXCEPTION( file, line, ASSOCIATEFAIL, INVALID_ASSOCIATION_MODE );
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}
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SET_FLAG( the_assoc, IO_ISASSOCIATED );
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return the_assoc;
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}
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/*
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* DISSOCIATE
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*/
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void
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__dissociate( Association_Mode* the_assoc, char* file, int line )
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{
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if( !the_assoc )
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CHILLEXCEPTION( file, line, EMPTY, NULL_ASSOCIATION );
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if( !TEST_FLAG( the_assoc, IO_ISASSOCIATED ) )
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CHILLEXCEPTION( file, line, NOTASSOCIATED, IS_NOT_ASSOCIATED );
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if( the_assoc->access )
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__disconnect( the_assoc->access, file, line );
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the_assoc->access = NULL;
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CLR_FLAG( the_assoc, IO_ISASSOCIATED );
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/* free allocated memory */
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if (the_assoc->pathname)
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{
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free (the_assoc->pathname);
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the_assoc->pathname = 0;
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}
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if (the_assoc->bufptr)
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{
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free (the_assoc->bufptr);
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the_assoc->bufptr = 0;
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}
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}
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/*
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* CREATE
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*/
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void __create( Association_Mode* the_assoc, char* file, int line )
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{
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if( !the_assoc )
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CHILLEXCEPTION( file, line, EMPTY, NULL_ASSOCIATION );
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if( !TEST_FLAG( the_assoc, IO_ISASSOCIATED ) )
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CHILLEXCEPTION( file, line, NOTASSOCIATED, IS_NOT_ASSOCIATED );
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if( TEST_FLAG( the_assoc, IO_EXISTING ) )
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CHILLEXCEPTION( file, line, CREATEFAIL, FILE_EXISTING );
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if( (the_assoc->handle = open( the_assoc->pathname, O_CREAT+O_TRUNC+O_WRONLY, 0666 ))
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== -1 )
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CHILLEXCEPTION( file, line, CREATEFAIL, CREATE_FAILS );
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the_assoc->usage = ReadWrite;
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GetSetAttributes( the_assoc );
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close( the_assoc->handle );
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}
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/*
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* MODIFY
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*/
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void
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__modify( Association_Mode* the_assoc,
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char* the_path,
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int the_path_len,
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char* the_mode,
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int the_mode_len,
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char* file,
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int line )
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{
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if( !the_assoc )
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CHILLEXCEPTION( file, line, EMPTY, NULL_ASSOCIATION );
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if( !TEST_FLAG( the_assoc, IO_ISASSOCIATED ) )
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CHILLEXCEPTION( file, line, NOTASSOCIATED, IS_NOT_ASSOCIATED );
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if( the_path_len )
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{
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char* oldname;
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if( ! (oldname = (char*)malloc( PATH_MAX )) )
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CHILLEXCEPTION( file, line, SPACEFAIL, PATHNAME_ALLOC );
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strcpy( oldname, the_assoc->pathname );
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makeName( the_assoc, the_path, the_path_len, file, line );
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if( rename( oldname, the_assoc->pathname ) )
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{
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free( oldname );
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CHILLEXCEPTION( file, line, MODIFYFAIL, RENAME_FAILS );
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}
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free( oldname );
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}
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else
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{
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/* FIXME: other options? */
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}
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}
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static
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/*** char* DirMode[] = { "rb", "r+b", "r+b" }; ***/
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int DirMode[] = { O_RDONLY, O_RDWR, O_RDWR };
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static
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/*** char* SeqMode [] = { "rb", "r+b", "r+b" }; ***/
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int SeqMode[] = { O_RDONLY, O_RDWR, O_RDWR };
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/*
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* CONNECT
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*/
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void
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__connect( void* the_transfer,
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Association_Mode* the_assoc,
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Usage_Mode the_usage,
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Where_Mode the_where,
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Boolean with_index,
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signed long the_index,
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char* file,
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int line )
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{
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Access_Mode* the_access;
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off_t filepos;
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off_t savepos;
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char dummy;
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unsigned long nbytes;
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int oflag;
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if( !the_transfer )
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CHILLEXCEPTION( file, line, EMPTY, NULL_ACCESS );
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if( !the_assoc )
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CHILLEXCEPTION( file, line, EMPTY, NULL_ASSOCIATION );
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if( TEST_FLAG((Text_Mode*)the_transfer, IO_TEXTLOCATION ))
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{
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if( ! ((Text_Mode*)the_transfer)->access_sub )
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CHILLEXCEPTION( file, line, EMPTY, NO_ACCESS_SUBLOCATION );
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the_access = ((Text_Mode*)the_transfer)->access_sub;
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SET_FLAG( the_access, IO_TEXTIO );
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}
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else
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{
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the_access = (Access_Mode*)the_transfer;
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CLR_FLAG( the_access, IO_TEXTIO );
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}
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/* FIXME: This should be an (implementation-dependent) static check
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if( with_index && the_access->rectype > Fixed )
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CHILLEXCEPTION( file, line, CONNECTFAIL, IMPL_RESTRICTION );
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*/
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if( ! TEST_FLAG(the_assoc, IO_ISASSOCIATED) )
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CHILLEXCEPTION( file, line, NOTASSOCIATED, IS_NOT_ASSOCIATED );
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if( ! TEST_FLAG( the_assoc, IO_EXISTING ) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_EXISTING );
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if( ! TEST_FLAG( the_assoc, IO_READABLE ) &&
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( the_usage = ReadOnly || the_usage == ReadWrite ) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_READABLE );
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if( ! TEST_FLAG( the_assoc, IO_WRITEABLE ) &&
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( the_usage = WriteOnly || the_usage == ReadWrite ) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_WRITEABLE );
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if( ! TEST_FLAG( the_assoc, IO_INDEXABLE )
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&& TEST_FLAG( the_access, IO_INDEXED ) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_INDEXABLE );
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if( ! TEST_FLAG( the_assoc, IO_SEQUENCIBLE )
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&& ! TEST_FLAG( the_access, IO_INDEXED ) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_SEQUENCIBLE );
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if( the_where == Same && the_assoc->access == NULL )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NO_CURRENT_POS );
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/* This dynamic condition is not checked for text connections. */
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if( ! TEST_FLAG( the_access, IO_TEXTIO ) )
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if( ! TEST_FLAG( the_assoc, IO_VARIABLE )
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&& the_access->rectype > Fixed
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&& ( the_usage == WriteOnly || the_usage == ReadWrite ) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_VARIABLE );
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if( TEST_FLAG( the_assoc, IO_VARIABLE )
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&& the_access->rectype == Fixed
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&& ( the_usage == ReadOnly || the_usage == ReadWrite ) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_FIXED );
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if( ! TEST_FLAG( the_access, IO_INDEXED ) && the_usage == ReadWrite )
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CHILLEXCEPTION( file, line, CONNECTFAIL, NOT_INDEXED );
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/* Access location may be connected to a different association. */
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if( the_access->association && the_access->association != the_assoc )
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__disconnect( the_access, file, line );
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/* Is the association location already connected? */
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if( the_assoc->access )
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{
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/* save position just in case we need it for the_where == Same */
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if( (savepos = lseek( the_assoc->handle, 0L, SEEK_CUR )) == -1L )
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CHILLEXCEPTION( file, line, CONNECTFAIL, LSEEK_FAILS );
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/* text: read correction, flush buffer */
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if( the_assoc->bufptr ){
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savepos -= the_assoc->bufptr->len - the_assoc->bufptr->cur;
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the_assoc->bufptr->len = the_assoc->bufptr->cur = 0;
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}
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/* implicit disconnect */
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__disconnect( the_assoc->access, file, line );
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}
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the_assoc->usage = the_usage;
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CLR_FLAG( the_access, IO_OUTOFFILE );
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if( TEST_FLAG( the_access, IO_INDEXED ) )
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{
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if( (the_assoc->handle = open( the_assoc->pathname, DirMode[the_usage] )) == -1 )
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CHILLEXCEPTION( file, line, CONNECTFAIL, OPEN_FAILS );
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/* Set base index. */
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switch( the_where )
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{
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case First:
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filepos = 0;
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break;
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case Same:
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filepos = savepos;
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break;
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case Last:
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if( lseek( the_assoc->handle, 0L, SEEK_END ) == -1L )
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CHILLEXCEPTION( file, line, CONNECTFAIL, LSEEK_FAILS );
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filepos = lseek( the_assoc->handle, 0L, SEEK_CUR );
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break;
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}
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/* Set current index */
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if( with_index )
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{
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if( the_index < the_access->lowindex
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|| the_access->highindex < the_index )
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CHILLEXCEPTION( file, line, RANGEFAIL, BAD_INDEX );
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filepos += (the_index - the_access->lowindex) * the_access->reclength;
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}
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if( lseek( the_assoc->handle, filepos, SEEK_SET ) == -1L )
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CHILLEXCEPTION( file, line, CONNECTFAIL, LSEEK_FAILS );
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the_access->base = filepos;
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}
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else
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{
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/* for association to text for reading: allocate buffer */
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if( TEST_FLAG((Text_Mode*)the_transfer, IO_TEXTLOCATION ) &&
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the_usage == ReadOnly &&
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!the_assoc->bufptr )
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{
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if( ! (the_assoc->bufptr = (readbuf_t*)malloc( sizeof(readbuf_t) )) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, BUFFER_ALLOC );
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memset (the_assoc->bufptr, 0, sizeof (readbuf_t));
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}
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if( (the_assoc->handle = open( the_assoc->pathname, SeqMode[the_usage] )) == -1 )
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CHILLEXCEPTION( file, line, CONNECTFAIL, OPEN_FAILS );
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/* Set base index. */
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switch( the_where )
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{
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case First:
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filepos = 0;
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break;
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case Same:
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filepos = savepos;
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break;
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case Last:
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if( lseek( the_assoc->handle, 0L, SEEK_END ) == -1L )
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CHILLEXCEPTION( file, line, CONNECTFAIL, LSEEK_FAILS );
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filepos = lseek( the_assoc->handle, 0L, SEEK_CUR );
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break;
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}
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/* file truncation for sequential, Write Only */
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/***************************** FIXME: cannot truncate at Same
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if( the_usage == WriteOnly )
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{
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if( fseek( the_assoc->file_ptr, filepos, SEEK_SET ) == -1L )
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CHILLEXCEPTION( file, line, CONNECTFAIL, FSEEK_FAILS );
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fclose( the_assoc->file_ptr );
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if( !(the_assoc->file_ptr = fopen( the_assoc->pathname, "ab" )) )
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CHILLEXCEPTION( file, line, CONNECTFAIL, OPEN_FAILS );
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}
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else
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***************************/
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if( (filepos = lseek( the_assoc->handle, filepos, SEEK_SET )) == -1L )
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CHILLEXCEPTION( file, line, CONNECTFAIL, LSEEK_FAILS );
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}
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the_access->association = the_assoc;
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the_assoc->access = the_access;
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/* for text: set carriage control default */
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if( TEST_FLAG((Text_Mode*)the_transfer, IO_TEXTLOCATION ) ){
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the_assoc->ctl_pre = '\0';
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the_assoc->ctl_post = '\n';
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}
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}
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void
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__disconnect( void* the_transfer, char* file, int line )
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{
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Access_Mode* the_access;
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if( !the_transfer )
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CHILLEXCEPTION( file, line, EMPTY, NULL_ACCESS );
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if( TEST_FLAG((Text_Mode*)the_transfer, IO_TEXTLOCATION ))
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{
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the_access = ((Text_Mode*)the_transfer)->access_sub;
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CLR_FLAG( the_access, IO_TEXTIO );
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}
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else
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the_access = (Access_Mode*)the_transfer;
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if( !the_access->association )
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CHILLEXCEPTION( file, line, NOTCONNECTED, IS_NOT_CONNECTED );
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close( the_access->association->handle );
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/* FIXME: check result */
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if( the_access->store_loc )
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free( the_access->store_loc );
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the_access->store_loc = NULL;
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the_access->association->access = NULL;
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the_access->association = NULL;
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}
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