Improve wording.

From Bug Hunting.

branches: 1.14.6; 1.14.10; 1.14.30;
Refer to the CAVEATS section of ctype(3) for more information.

Added a reference to ctype.3. What's the value of having that page at
all if it isn't referenced by others?

Suggested by Slava Semushin via private mail.

Fixed the wording of the <ctype.h> character classification functions by
always using "function" instead of "macro".

Changed "undefined result" into "undefined behavior" for argument values
outside the valid range. Since the character table is allocated via
malloc(), it _may_ happen that it starts at a page boundary, so that
negative values for the argument result in a segmentation fault. In that
case, there is no result at all.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Use
.In header.h
instead of
.Fd #include \*[Lt]header.h\*[Gt]
Much easier to read and write, and supported by groff for ages.
Okayed by ross.

import CAVEATS sections from OpenBSD.
with little tweak by me.

Generate <>& symbolically.

Standardize section headers, sort sections, sort SEE ALSO, punctuation
and misc. fixes.

Boring whitespace fixes.

branches: 1.5.12;
add LIBRARY section to man page

merge with Lite, keeping local changes. Fix up Id format, etc.

Make sure all items in SEE ALSO list are comma separated.
Add cross references to isblank().

Add RCS identifiers.

branches: 1.1.1;
Initial revision