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Annotation of 43BSD/usr.lib/libI77/sue.c, revision 1.1.1.1

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       5.1     6/7/85
                      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,flag) 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(flag,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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