external/bsd/pcc/dist/pcc-libs/libI77/due.c

   1 /*      $Id: due.c,v 1.1.1.1 2008/08/24 05:34:47 gmcgarry Exp $ */
   2 /*
   3  * Copyright(C) Caldera International Inc. 2001-2002. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * Redistributions of source code and documentation must retain the above
  10  * copyright notice, this list of conditions and the following disclaimer.
  11  * Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditionsand the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  * All advertising materials mentioning features or use of this software
  15  * must display the following acknowledgement:
  16  *      This product includes software developed or owned by Caldera
  17  *      International, Inc.
  18  * Neither the name of Caldera International, Inc. nor the names of other
  19  * contributors may be used to endorse or promote products derived from
  20  * this software without specific prior written permission.
  21  *
  22  * USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
  23  * INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  25  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  * DISCLAIMED.  IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OFLIABILITY, WHETHER IN CONTRACT,
  31  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  32  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35 #include "fio.h"
  36
  37 int
  38 s_rdue(cilist *a)
  39 {
  40         int n;
  41         if((n=c_due(a,READ))) return(n);
  42         reading=1;
  43         if(curunit->uwrt) nowreading(curunit);
  44         return(0);
  45 }
  46
  47 int
  48 s_wdue(cilist *a)
  49 {
  50         int n;
  51         if((n=c_due(a,WRITE))) return(n);
  52         reading=0;
  53         if(!curunit->uwrt) nowwriting(curunit);
  54         return(0);
  55 }
  56
  57 int
  58 c_due(cilist *a, int flag)
  59 {
  60         if(!init) f_init();
  61         if(a->ciunit>=MXUNIT || a->ciunit<0)
  62                 err(a->cierr,101,"startio");
  63         recpos=sequential=formatted=0;
  64         external=1;
  65         curunit = &units[a->ciunit];
  66         elist=a;
  67         if(curunit->ufd==NULL && fk_open(flag,DIR,UNF,a->ciunit) ) err(a->cierr,104,"due");
  68         cf=curunit->ufd;
  69         if(curunit->ufmt) err(a->cierr,102,"cdue")
  70         if(!curunit->useek) err(a->cierr,104,"cdue")
  71         if(curunit->ufd==NULL) err(a->cierr,114,"cdue")
  72         fseek(cf,(long)(a->cirec-1)*curunit->url,0);
  73         curunit->uend = 0;
  74         return(0);
  75 }
  76
  77 int
  78 e_rdue()
  79 {
  80         if(curunit->url==1 || recpos==curunit->url)
  81                 return(0);
  82         fseek(cf,(long)(curunit->url-recpos),1);
  83         if(ftell(cf)%curunit->url)
  84                 err(elist->cierr,200,"syserr");
  85         return(0);
  86 }
  87
  88 int
  89 e_wdue()
  90 {
  91         return(e_rdue());
  92 }