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Annotation of 43BSD/usr.lib/libI77/due.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)due.c       5.1     6/7/85
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * direct unformatted external i/o
        !            11:  */
        !            12: 
        !            13: #include "fio.h"
        !            14: 
        !            15: LOCAL char rdue[] = "read due";
        !            16: LOCAL char wdue[] = "write due";
        !            17: 
        !            18: s_rdue(a) cilist *a;
        !            19: {
        !            20:        int n;
        !            21:        reading = YES;
        !            22:        if(n=c_due(a,READ)) return(n);
        !            23:        if(curunit->uwrt && ! nowreading(curunit)) err(errflag, errno, rdue);
        !            24:        return(OK);
        !            25: }
        !            26: 
        !            27: s_wdue(a) cilist *a;
        !            28: {
        !            29:        int n;
        !            30:        reading = NO;
        !            31:        if(n=c_due(a,WRITE)) return(n);
        !            32:        curunit->uend = NO;
        !            33:        if(!curunit->uwrt && ! nowwriting(curunit)) err(errflag, errno, wdue)
        !            34:        return(OK);
        !            35: }
        !            36: 
        !            37: LOCAL
        !            38: c_due(a,flag) cilist *a;
        !            39: {      int n;
        !            40:        lfname = NULL;
        !            41:        elist = NO;
        !            42:        sequential=formatted=NO;
        !            43:        recpos = reclen = 0;
        !            44:        external = YES;
        !            45:        errflag = a->cierr;
        !            46:        endflag = a->ciend;
        !            47:        lunit = a->ciunit;
        !            48:        if(not_legal(lunit)) err(errflag,F_ERUNIT,rdue+5);
        !            49:        curunit = &units[lunit];
        !            50:        if (!curunit->ufd && (n=fk_open(flag,DIR,UNF,(ftnint)lunit)) )
        !            51:                err(errflag,n,rdue+5)
        !            52:        cf = curunit->ufd;
        !            53:        elist = YES;
        !            54:        lfname = curunit->ufnm;
        !            55:        if (curunit->ufmt) err(errflag,F_ERNOUIO,rdue+5)
        !            56:        if (!curunit->useek || !curunit->url) err(errflag,F_ERNODIO,rdue+5)
        !            57:        if (fseek(cf, (long)((a->cirec-1)*curunit->url), 0) < 0)
        !            58:                return(due_err(rdue+5));
        !            59:        else
        !            60:                return(OK);
        !            61: }
        !            62: 
        !            63: e_rdue()
        !            64: {
        !            65:        return(OK);
        !            66: }
        !            67: 
        !            68: e_wdue()
        !            69: {/*    This is to ensure full records. It is really necessary. */
        !            70:        int n = 0;
        !            71:        if (curunit->url!=1 && recpos!=curunit->url &&
        !            72:            (fseek(cf, (long)(curunit->url-recpos-1), 1) < 0
        !            73:                || fwrite(&n, 1, 1, cf) != 1))
        !            74:                        return(due_err(rdue+5));
        !            75:        return(OK);
        !            76: }

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