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Add more verbage explaining the "-I" option and its behavior.

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Submitted by:	Archie Cobbs <archie@whistle.com>
This commit is contained in:
David E. O'Brien 1999-10-27 20:21:03 +00:00
parent 4111d344ce
commit b60b8d23b8
1 changed files with 9 additions and 0 deletions
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usr.bin/lex/lex.1
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@ -1906,6 +1906,7 @@ interactive to avoid problems due to waiting to fill buffers
flag below). A non-zero value
in the macro invocation marks the buffer as interactive, a zero
value as non-interactive. Note that use of this macro overrides
.B %option interactive ,
.B %option always-interactive
or
.B %option never-interactive
@ -2313,6 +2314,14 @@ or
Thus, this option is not really needed; it is on by default for all those
cases in which it is allowed.
.IP
Note that if
.B isatty()
returns false for the scanner input, flex will revert to batch mode, even if
.B \-I
was specified. To force interactive mode no matter what, use
.B %option always-interactive
(see Options below).
.IP
You can force a scanner to
.I not
be interactive by using