If the -L option is specified twice, use it for the second filename
like GNU diff does. Adapted from a diff by YAMAMOTO Takashi

Implement -I option: ignore changes matching a set of regexes. From
Jared Yanovich, with twists from millert@ and me. Testing by brad@,
sturm@ and pval@. ok millert@

POSIX specifies that in directory mode device special files and
FIFOs shall be skipped. Other types of files may be skipped too
(this is implementation-dependent). In directory mode, just skip
anyt

POSIX specifies that in directory mode device special files and
FIFOs shall be skipped. Other types of files may be skipped too
(this is implementation-dependent). In directory mode, just skip
anything that is not a regular file or directory. OK tedu@

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use new .St macro;

Document -p option. ok jmc@

- move `-d' to comparison options, rather then output options
- note (again) that output options are mutually exclusive

from Andy Isaacson (PR 3479)

- 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@

Start new sentence on a new line.
ok jmc@

- 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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Fixed the "dot alone on a line" bug.

Bring FILES section up to date.

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

Add STANDARDS section

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

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

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

tweak;
ok tedu@

-a to force ascii compare. ok millert

Update with unidiff info and make FILES section fit reality.
With input from jmc@

cleanup;
ok deraadt@

this can be 3 term; gwyllion@ace.ulyssis.org

cleanup. ansi, headers, correct prototypes, some safer string and
tempfile functions, whitespace, ...
no functional improvements yet