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Annotation of 42BSD/usr.lib/libU77/isatty_.c, revision 1.1

1.1     ! root        1: /*
        !             2: char id_isatty[] = "@(#)isatty_.c      1.1";
        !             3:  *
        !             4:  * determine if stream is associated with a tty (async port)
        !             5:  *
        !             6:  * calling sequence:
        !             7:  *     logical isatty, val
        !             8:  *     val = isatty (lunit)
        !             9:  * where:
        !            10:  *     val will be .TRUE. if lunit is associated with a 'tty'
        !            11:  */
        !            12: 
        !            13: #include       "../libI77/fiodefs.h"
        !            14: 
        !            15: extern unit units[];   /* logical units table from iolib */
        !            16: 
        !            17: long isatty_(u)
        !            18: long *u;
        !            19: {
        !            20:        int     i;
        !            21:        unit    *lu;
        !            22: 
        !            23:        if (*u < 0 || *u >= MXUNIT)
        !            24:                return(0);
        !            25:        lu = &units[*u];
        !            26:        if (!lu->ufd)
        !            27:                return(0);
        !            28:        return((long)(isatty(fileno(lu->ufd)) != 0));
        !            29: }

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