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Annotation of 43BSD/usr.lib/libU77/isatty_.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:  *     @(#)isatty_.c   5.1     6/7/85
                      7:  */
                      8: 
                      9: /*
                     10:  * determine if stream is associated with a tty (async port)
                     11:  *
                     12:  * calling sequence:
                     13:  *     logical isatty, val
                     14:  *     val = isatty (lunit)
                     15:  * where:
                     16:  *     val will be .TRUE. if lunit is associated with a 'tty'
                     17:  */
                     18: 
                     19: #include       "../libI77/fiodefs.h"
                     20: 
                     21: extern unit units[];   /* logical units table from iolib */
                     22: 
                     23: long isatty_(u)
                     24: long *u;
                     25: {
                     26:        int     i;
                     27:        unit    *lu;
                     28: 
                     29:        if (*u < 0 || *u >= MXUNIT)
                     30:                return(0);
                     31:        lu = &units[*u];
                     32:        if (!lu->ufd)
                     33:                return(0);
                     34:        return((long)(isatty(fileno(lu->ufd)) != 0));
                     35: }

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