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Annotation of 41BSD/lib/libI77uc/due.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * direct unformatted external i/o
                      3:  */
                      4: 
                      5: #include "fio.h"
                      6: 
                      7: char *due = "due";
                      8: 
                      9: s_rdue(a) cilist *a;
                     10: {
                     11:        int n;
                     12:        reading = YES;
                     13:        if(n=c_due(a,READ)) return(n);
                     14:        if(curunit->uwrt) nowreading(curunit);
                     15:        return(OK);
                     16: }
                     17: 
                     18: s_wdue(a) cilist *a;
                     19: {
                     20:        int n;
                     21:        reading = NO;
                     22:        if(n=c_due(a,WRITE)) return(n);
                     23:        curunit->uend = NO;
                     24:        if(!curunit->uwrt) nowwriting(curunit);
                     25:        return(OK);
                     26: }
                     27: 
                     28: c_due(a,flag) cilist *a;
                     29: {      int n;
                     30:        lfname = NULL;
                     31:        elist = NO;
                     32:        sequential=formatted=NO;
                     33:        recpos = reclen = 0;
                     34:        external = YES;
                     35:        errflag = a->cierr;
                     36:        endflag = a->ciend;
                     37:        lunit = a->ciunit;
                     38:        if(not_legal(lunit)) err(errflag,101,due);
                     39:        curunit = &units[lunit];
                     40:        if (!curunit->ufd && (n=fk_open(flag,DIR,UNF,(ftnint)lunit)) )
                     41:                err(errflag,n,due)
                     42:        cf = curunit->ufd;
                     43:        elist = YES;
                     44:        lfname = curunit->ufnm;
                     45:        if (curunit->ufmt) err(errflag,103,due)
                     46:        if (!curunit->useek || !curunit->url) err(errflag,104,due)
                     47:        if (fseek(cf, (long)((a->cirec-1)*curunit->url), 0) < 0)
                     48:                return(due_err(due));
                     49:        else
                     50:                return(OK);
                     51: }
                     52: 
                     53: e_rdue()
                     54: {
                     55:        return(OK);
                     56: }
                     57: 
                     58: e_wdue()
                     59: {/*    This is to ensure full records. It is really necessary. */
                     60:        int n = 0;
                     61:        if (curunit->url!=1 && recpos!=curunit->url &&
                     62:            (fseek(cf, (long)(curunit->url-recpos-1), 1) < 0
                     63:                || fwrite(&n, 1, 1, cf) != 1))
                     64:                        return(due_err(due));
                     65:        return(OK);
                     66: }

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