Fix printing of "Only in foo" when foo is "/" (trailing slash removal
was overzealous in this case). Fix tested by Hugo Villeneuve and myself.

Make -number be an error (similar to my change in grep.c); OK tedu@

- add -P to SYNOPSIS
- remove "mutually exclusive" clause
- -c produces 15 *'s, not a dozen
- add -a to uage()
- sync usage() with SYNOPSIS

ok tedu@

try again at -u#. ok deraadt@

restore undocumented -u# support for the old schoolers. :)
noticed by itojun@, ok deraadt@

fix spelling of --initial-tab
ok otto@

clean

Correct computation of argsize when setting diffargs.

- Use a heuristic to bound memory and cpu usage, at the cost of
producing suboptimal diffs for large file containing lots of changes.
Switch heuristic off with -d/--minimal (GNU compatible). Some hi

- Use a heuristic to bound memory and cpu usage, at the cost of
producing suboptimal diffs for large file containing lots of changes.
Switch heuristic off with -d/--minimal (GNU compatible). Some hints
from millert@.
- Improve performance by reducing the number of realloc(3) calls.

ok millert@ tedu@

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Add missing terminator to long options list.

Implement the -L and -T options from GNU diff.

Don't print a trailing '/' in foo when printing "Only in foo: bar"

Fix printing of status when not in -l mode which was broken when the
-l support was added.

a little KNF

POSIX-compliant output when there are two paths w/ the same name but
one is a file and the other is a directory in -r mode (cosmetic).

Unlink temp file as soon as it is opened and return a FILE * for
it so we don't have to worry about cleanup. This means the quit()
signal handler and error/errorx can go away too.

Move splice() out

Unlink temp file as soon as it is opened and return a FILE * for
it so we don't have to worry about cleanup. This means the quit()
signal handler and error/errorx can go away too.

Move splice() out of diffreg() and into diff.c where it belongs
since we don't want to be calling splice() for a directory diff.
Add a check for mismatched paths (one file, one dir) in diffreg.c.

deraadt@ OK

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Re-implement -l flag; diff -l now works correctly in non-directory
mode (like GNU diff).

o Avoid a temp file if using stdin and stdin is redirected from a regular file
o Fix a double free in the temmp file case

Add -q option from GNU diff

Implement -P from GNU diff (like -N but only for files that are missing
from dir1).

Some fairly major changes:
o -N is implemented
o -X is implemented
o -x is implemented
o diff.c has been rewritten and GNU long options are now supported
o diffdir.c has been rewritten
+ no

Some fairly major changes:
o -N is implemented
o -X is implemented
o -x is implemented
o diff.c has been rewritten and GNU long options are now supported
o diffdir.c has been rewritten
+ no longer does fork + exec of /usr/bin/diff
+ can be called recursively (and will be for -r)
o diff.h
+ don't include any .h files here any more, do it in the .c files
+ no Bell Labs code in this, gets a UCB copyright (the 32v sources
only have a diff.c and there is nothing in common).
o diffreg.c
+ most all remaining globals are now private to diffreg.c
+ files are only opened once
+ dynamically allocated objects are either freed or realloced
+ added missing UCB copyright (there were lots of UCB changes)
+ print correct thing when -s is specified
OK deraadt@

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Accept but ignore -h for backwards compat like GNU diff does.
Pointed out by espie@. Also remove other references to -h mode.

Kill non-standard -l option as discussed with tedu@

Kill diff -h, we don't use or want diffh. Discussed w/ tedu@

Some cosmetic fixes:
o get rid of now-unused tempfile variable
o move inifdef into diffreg.c (only used there)
o correct a comment
o use _PATH_DIFF, _PATH_DIFFH and _PATH_PR instead of variables set

Some cosmetic fixes:
o get rid of now-unused tempfile variable
o move inifdef into diffreg.c (only used there)
o correct a comment
o use _PATH_DIFF, _PATH_DIFFH and _PATH_PR instead of variables set to them
o get rid of hack to look for pr and diff in /bin

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