libchill/writerecord.c

   1 /* Implement Input/Output runtime actions for CHILL.
   2    Copyright (C) 1992,1993 Free Software Foundation, Inc.
   3    Author: Wilfried Moser, et al
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* As a special exception, if you link this library with other files,
  22    some of which are compiled with GCC, to produce an executable,
  23    this library does not by itself cause the resulting executable
  24    to be covered by the GNU General Public License.
  25    This exception does not however invalidate any other reasons why
  26    the executable file might be covered by the GNU General Public License.  */
  27
  28 #include <setjmp.h>
  29 #include <errno.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include <sys/types.h>
  33
  34 #include "fileio.h"
  35
  36 static
  37 void
  38 doWrite( Access_Mode* the_access, void* buf, size_t nbyte )
  39 {
  40   size_t nwrit;
  41
  42   nwrit = write( the_access->association->handle, buf, nbyte );
  43
  44   if( nwrit < nbyte )
  45   {
  46     the_access->association->syserrno = errno;
  47     RWEXCEPTION( WRITEFAIL, OS_IO_ERROR );
  48   }
  49 }
  50
  51
  52 void
  53 __writerecord( Access_Mode*  the_access,
  54                signed long   the_index,
  55                char*         the_val_addr,
  56                unsigned long the_val_len,
  57                char*         file,
  58                int           line )
  59
  60 {
  61   Association_Mode* the_assoc;
  62   unsigned long  info;
  63   char*          actaddr;
  64   unsigned short actlen;
  65   off_t          filepos;
  66
  67   if( !the_access )
  68     CHILLEXCEPTION( file, line, EMPTY, NULL_ACCESS );
  69
  70   if( !(the_assoc = the_access->association) )
  71     CHILLEXCEPTION( file, line, NOTCONNECTED, IS_NOT_CONNECTED );
  72
  73   /* Usage must no be ReadOnly */
  74   if( the_assoc->usage == ReadOnly )
  75     CHILLEXCEPTION( file, line, WRITEFAIL, BAD_USAGE );
  76
  77   /*
  78    *  Positioning
  79    */
  80   if( TEST_FLAG( the_access, IO_INDEXED ) )
  81   {
  82     /* index expression must be within bounds of index mode */
  83     if( the_index < the_access->lowindex
  84         || the_access->highindex < the_index )
  85       CHILLEXCEPTION( file, line, RANGEFAIL, BAD_INDEX );
  86     filepos = the_access->base +
  87               (the_index - the_access->lowindex) * the_access->reclength;
  88
  89     if( lseek( the_assoc->handle, filepos, SEEK_SET ) == -1L )
  90       CHILLEXCEPTION( file, line, WRITEFAIL, LSEEK_FAILS );
  91   }
  92
  93   if( (info = setjmp( __rw_exception )) )
  94     CHILLEXCEPTION( file, line, info>>16, info & 0xffff );
  95
  96   if( TEST_FLAG( the_access, IO_TEXTIO ) )
  97   {
  98     if( TEST_FLAG( the_access, IO_INDEXED ) )
  99     {
 100       int nspace = the_access->reclength - the_val_len;
 101       memset( the_val_addr + 2 + the_val_len, ' ', nspace );
 102       actlen = the_access->reclength - 2;
 103       MOV2(the_val_addr,&actlen);
 104       doWrite( the_access, the_val_addr, the_access->reclength );
 105     }
 106     else
 107     {
 108       if( the_assoc->ctl_pre )
 109         write( the_assoc->handle, &the_assoc->ctl_pre, 1 );
 110       MOV2(&actlen,the_val_addr);
 111       write( the_assoc->handle, the_val_addr + 2, actlen );
 112       if( the_assoc->ctl_post )
 113         write( the_assoc->handle, &the_assoc->ctl_post, 1 );
 114       the_assoc->ctl_pre  = '\0';
 115       the_assoc->ctl_post = '\n';
 116     }
 117   }
 118   else
 119   {
 120     switch( the_access->rectype )
 121     {
 122     case Fixed:
 123       if( TEST_FLAG( the_assoc, IO_VARIABLE ) )
 124       {
 125         actlen = the_access->reclength;
 126         doWrite( the_access, &actlen, sizeof(actlen) );
 127       }
 128       doWrite( the_access, the_val_addr, the_val_len );
 129       break;
 130     case VaryingChars:
 131       MOV2(&actlen,the_val_addr);
 132       if( actlen > the_access->reclength - 2 )
 133         CHILLEXCEPTION( file, line, RANGEFAIL, RECORD_TOO_LONG );
 134       actlen = TEST_FLAG( the_access, IO_INDEXED )
 135                ? the_access->reclength : actlen + 2;
 136       doWrite( the_access, the_val_addr, actlen );
 137       break;
 138     }
 139   }
 140 }