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Annotation of 43BSDReno/lib/libI77/sue.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:  *     @(#)sue.c       5.2     2/25/90
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * sequential unformatted external read/write routines
        !            11:  */
        !            12: 
        !            13: #include "fio.h"
        !            14: 
        !            15: extern int reclen;
        !            16: LOCAL long recloc;
        !            17: LOCAL char rsue[] = "read sue";
        !            18: LOCAL char wsue[] = "write sue";
        !            19: 
        !            20: s_rsue(a) cilist *a;
        !            21: {
        !            22:        int n;
        !            23:        reading = YES;
        !            24:        if(n=c_sue(a,READ)) return(n);
        !            25:        if(curunit->uwrt && ! nowreading(curunit)) err(errflag, errno, rsue)
        !            26:        recpos = 0;
        !            27:        if(fread(&reclen,sizeof(int),1,cf) == 1) return(OK);
        !            28:        if(feof(cf))
        !            29:        {       curunit->uend = YES;
        !            30:                err(endflag, EOF, rsue)
        !            31:        }
        !            32:        clearerr(cf);
        !            33:        err(errflag, errno, rsue)
        !            34: }
        !            35: 
        !            36: s_wsue(a) cilist *a;
        !            37: {
        !            38:        int n;
        !            39:        reading = NO;
        !            40:        if(n=c_sue(a,WRITE)) return(n);
        !            41:        if(!curunit->uwrt && ! nowwriting(curunit)) err(errflag, errno, wsue)
        !            42:        reclen = 0;
        !            43:        recloc=ftell(cf);
        !            44:        fseek(cf,(long)sizeof(int),1);
        !            45:        curunit->uend = NO;
        !            46:        return(OK);
        !            47: }
        !            48: 
        !            49: LOCAL
        !            50: c_sue(a,flg) cilist *a;
        !            51: {      int n;
        !            52:        external = sequential = YES;
        !            53:        formatted = NO;
        !            54:        lfname = NULL;
        !            55:        elist = NO;
        !            56:        errflag = a->cierr;
        !            57:        endflag = a->ciend;
        !            58:        lunit = a->ciunit;
        !            59:        if(not_legal(lunit)) err(errflag,F_ERUNIT,rsue+5)
        !            60:        curunit = &units[lunit];
        !            61:        if(!curunit->ufd && (n=fk_open(flg,SEQ,UNF,(ftnint)lunit)))
        !            62:                err(errflag,n,rsue+5)
        !            63:        cf = curunit->ufd;
        !            64:        elist = YES;
        !            65:        lfname = curunit->ufnm;
        !            66:        if(curunit->ufmt) err(errflag,F_ERNOUIO,rsue+5)
        !            67:        if(curunit->url) err(errflag,F_ERNOSIO,rsue+5)
        !            68:        if(!curunit->useek) err(errflag,F_ERSEEK,rsue+5)
        !            69:        return(OK);
        !            70: }
        !            71: 
        !            72: e_wsue()
        !            73: {      long loc;
        !            74:        fwrite(&reclen,sizeof(int),1,cf);
        !            75:        loc=ftell(cf);
        !            76:        fseek(cf,recloc,0);
        !            77:        fwrite(&reclen,sizeof(int),1,cf);
        !            78:        fseek(cf,loc,0);
        !            79:        return(OK);
        !            80: }
        !            81: 
        !            82: e_rsue()
        !            83: {
        !            84:        fseek(cf,(long)(reclen-recpos+sizeof(int)),1);
        !            85:        return(OK);
        !            86: }

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