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Annotation of 43BSD/usr.lib/libU77/isatty_.c, revision 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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