cal: don't print terminal control characters unless stdout is a TTY
A similar change was made in svn r223931, but it was incomplete, working only when the utility was invoked as "ncal". Fix the same issue when invoking as "cal". PR: 268936 Reported by: Ray Bellis <ray@bellis.me.uk> MFC after: 2 weeks Sponsored by: Axcient Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D38045
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@ -930,7 +930,8 @@ mkmonthb(int y, int m, int jd_flag, struct monthlines *mlines)
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dt.d = j - jan1 + 1;
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else
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sdateb(j, &dt);
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if (j == highlightdate && !flag_nohighlight)
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if (j == highlightdate && !flag_nohighlight
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&& isatty(STDOUT_FILENO))
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highlight(mlines->lines[i] + k,
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ds + dt.d * dw, dw, &l);
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else
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