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Annotation of 43BSD/usr.lib/libU77/fseek_.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:  *     @(#)fseek_.c    5.1     6/7/85
                      7:  */
                      8: 
                      9: /*
                     10:  * position a file associated with a fortran logical unit
                     11:  *
                     12:  * calling sequence:
                     13:  *     ierror = fseek(lunit, ioff, ifrom)
                     14:  * where:
                     15:  *     lunit is an open logical unit
                     16:  *     ioff is an offset in bytes relative to the position specified by ifrom
                     17:  *     ifrom   - 0 means 'beginning of the file'
                     18:  *             - 1 means 'the current position'
                     19:  *             - 2 means 'the end of the file'
                     20:  *     ierror will be 0 if successful, a system error code otherwise.
                     21:  */
                     22: 
                     23: #include       <stdio.h>
                     24: #include       "../libI77/f_errno.h"
                     25: #include       "../libI77/fiodefs.h"
                     26: 
                     27: extern unit units[];
                     28: 
                     29: long fseek_(lu, off, from)
                     30: long *lu, *off, *from;
                     31: {
                     32:        if (*lu < 0 || *lu >= MXUNIT)
                     33:                return((long)(errno=F_ERUNIT));
                     34:        if (*from < 0 || *from > 2)
                     35:                return((long)(errno=F_ERARG));
                     36:        if (!units[*lu].ufd)
                     37:                return((long)(errno=F_ERNOPEN));
                     38:        if (fseek(units[*lu].ufd, *off, (int)*from) < 0)
                     39:                return((long)errno);
                     40:        return(0L);
                     41: }

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