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Annotation of 42BSD/usr.lib/libU77/isatty_.c, revision 1.1.1.1

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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