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Annotation of 42BSD/usr.lib/libI77/sue.c, revision 1.1

1.1     ! root        1: /*
        !             2: char id_sue[] = "@(#)sue.c     1.3";
        !             3:  *
        !             4:  * sequential unformatted external read/write routines
        !             5:  */
        !             6: 
        !             7: #include "fio.h"
        !             8: 
        !             9: extern int reclen;
        !            10: long recloc;
        !            11: char rsue[] = "read sue";
        !            12: char wsue[] = "write sue";
        !            13: 
        !            14: s_rsue(a) cilist *a;
        !            15: {
        !            16:        int n;
        !            17:        reading = YES;
        !            18:        if(n=c_sue(a,READ)) return(n);
        !            19:        if(curunit->uwrt && ! nowreading(curunit)) err(errflag, errno, rsue)
        !            20:        recpos = 0;
        !            21:        if(fread(&reclen,sizeof(int),1,cf) == 1) return(OK);
        !            22:        if(feof(cf))
        !            23:        {       curunit->uend = YES;
        !            24:                err(endflag, EOF, rsue)
        !            25:        }
        !            26:        clearerr(cf);
        !            27:        err(errflag, errno, rsue)
        !            28: }
        !            29: 
        !            30: s_wsue(a) cilist *a;
        !            31: {
        !            32:        int n;
        !            33:        reading = NO;
        !            34:        if(n=c_sue(a,WRITE)) return(n);
        !            35:        if(!curunit->uwrt && ! nowwriting(curunit)) err(errflag, errno, wsue)
        !            36:        reclen = 0;
        !            37:        recloc=ftell(cf);
        !            38:        fseek(cf,(long)sizeof(int),1);
        !            39:        curunit->uend = NO;
        !            40:        return(OK);
        !            41: }
        !            42: 
        !            43: c_sue(a,flag) cilist *a;
        !            44: {      int n;
        !            45:        external = sequential = YES;
        !            46:        formatted = NO;
        !            47:        lfname = NULL;
        !            48:        elist = NO;
        !            49:        errflag = a->cierr;
        !            50:        endflag = a->ciend;
        !            51:        lunit = a->ciunit;
        !            52:        if(not_legal(lunit)) err(errflag,F_ERUNIT,rsue+5)
        !            53:        curunit = &units[lunit];
        !            54:        if(!curunit->ufd && (n=fk_open(flag,SEQ,UNF,(ftnint)lunit)))
        !            55:                err(errflag,n,rsue+5)
        !            56:        cf = curunit->ufd;
        !            57:        elist = YES;
        !            58:        lfname = curunit->ufnm;
        !            59:        if(curunit->ufmt) err(errflag,F_ERNOUIO,rsue+5)
        !            60:        if(curunit->url) err(errflag,F_ERNOSIO,rsue+5)
        !            61:        if(!curunit->useek) err(errflag,F_ERSEEK,rsue+5)
        !            62:        return(OK);
        !            63: }
        !            64: 
        !            65: e_wsue()
        !            66: {      long loc;
        !            67:        fwrite(&reclen,sizeof(int),1,cf);
        !            68:        loc=ftell(cf);
        !            69:        fseek(cf,recloc,0);
        !            70:        fwrite(&reclen,sizeof(int),1,cf);
        !            71:        fseek(cf,loc,0);
        !            72:        return(OK);
        !            73: }
        !            74: 
        !            75: e_rsue()
        !            76: {
        !            77:        fseek(cf,(long)(reclen-recpos+sizeof(int)),1);
        !            78:        return(OK);
        !            79: }

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