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Annotation of 43BSD/usr.lib/libU77/ftell_.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:  *     @(#)ftell_.c    5.1     6/7/85
                      7:  */
                      8: 
                      9: /*
                     10:  * return current file position
                     11:  *
                     12:  * calling sequence:
                     13:  *     integer curpos, ftell
                     14:  *     curpos = ftell(lunit)
                     15:  * where:
                     16:  *     lunit is an open logical unit
                     17:  *     curpos will be the current offset in bytes from the start of the
                     18:  *             file associated with that logical unit
                     19:  *             or a (negative) system error code.
                     20:  */
                     21: 
                     22: #include       "../libI77/fiodefs.h"
                     23: #include       "../libI77/f_errno.h"
                     24: 
                     25: extern unit units[];
                     26: 
                     27: long ftell_(lu)
                     28: long *lu;
                     29: {
                     30:        if (*lu < 0 || *lu >= MXUNIT)
                     31:                return(-(long)(errno=F_ERUNIT));
                     32:        if (!units[*lu].ufd)
                     33:                return(-(long)(errno=F_ERNOPEN));
                     34:        return(ftell(units[*lu].ufd));
                     35: }

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