WHATSNEW
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上传日期:2020-05-20
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- # @(#)WHATSNEW 8.3 (Berkeley) 3/18/94
- New in alpha3.4: The complex bug alluded to below has been fixed (in a
- slightly kludgey temporary way that may hurt efficiency a bit; this is
- another "get it out the door for 4.4" release). The tests at the end of
- the tests file have accordingly been uncommented. The primary sign of
- the bug was that something like a?b matching ab matched b rather than ab.
- (The bug was essentially specific to this exact situation, else it would
- have shown up earlier.)
- New in alpha3.3: The definition of word boundaries has been altered
- slightly, to more closely match the usual programming notion that "_"
- is an alphabetic. Stuff used for pre-ANSI systems is now in a subdir,
- and the makefile no longer alludes to it in mysterious ways. The
- makefile has generally been cleaned up some. Fixes have been made
- (again!) so that the regression test will run without -DREDEBUG, at
- the cost of weaker checking. A workaround for a bug in some folks'
- <assert.h> has been added. And some more things have been added to
- tests, including a couple right at the end which are commented out
- because the code currently flunks them (complex bug; fix coming).
- Plus the usual minor cleanup.
- New in alpha3.2: Assorted bits of cleanup and portability improvement
- (the development base is now a BSDI system using GCC instead of an ancient
- Sun system, and the newer compiler exposed some glitches). Fix for a
- serious bug that affected REs using many [] (including REG_ICASE REs
- because of the way they are implemented), *sometimes*, depending on
- memory-allocation patterns. The header-file prototypes no longer name
- the parameters, avoiding possible name conflicts. The possibility that
- some clot has defined CHAR_MIN as (say) `-128' instead of `(-128)' is
- now handled gracefully. "uchar" is no longer used as an internal type
- name (too many people have the same idea). Still the same old lousy
- performance, alas.
- New in alpha3.1: Basically nothing, this release is just a bookkeeping
- convenience. Stay tuned.
- New in alpha3.0: Performance is no better, alas, but some fixes have been
- made and some functionality has been added. (This is basically the "get
- it out the door in time for 4.4" release.) One bug fix: regfree() didn't
- free the main internal structure (how embarrassing). It is now possible
- to put NULs in either the RE or the target string, using (resp.) a new
- REG_PEND flag and the old REG_STARTEND flag. The REG_NOSPEC flag to
- regcomp() makes all characters ordinary, so you can match a literal
- string easily (this will become more useful when performance improves!).
- There are now primitives to match beginnings and ends of words, although
- the syntax is disgusting and so is the implementation. The REG_ATOI
- debugging interface has changed a bit. And there has been considerable
- internal cleanup of various kinds.
- New in alpha2.3: Split change list out of README, and moved flags notes
- into Makefile. Macro-ized the name of regex(7) in regex(3), since it has
- to change for 4.4BSD. Cleanup work in engine.c, and some new regression
- tests to catch tricky cases thereof.
- New in alpha2.2: Out-of-date manpages updated. Regerror() acquires two
- small extensions -- REG_ITOA and REG_ATOI -- which avoid debugging kludges
- in my own test program and might be useful to others for similar purposes.
- The regression test will now compile (and run) without REDEBUG. The
- BRE $ bug is fixed. Most uses of "uchar" are gone; it's all chars now.
- Char/uchar parameters are now written int/unsigned, to avoid possible
- portability problems with unpromoted parameters. Some unsigned casts have
- been introduced to minimize portability problems with shifting into sign
- bits.
- New in alpha2.1: Lots of little stuff, cleanup and fixes. The one big
- thing is that regex.h is now generated, using mkh, rather than being
- supplied in the distribution; due to circularities in dependencies,
- you have to build regex.h explicitly by "make h". The two known bugs
- have been fixed (and the regression test now checks for them), as has a
- problem with assertions not being suppressed in the absence of REDEBUG.
- No performance work yet.
- New in alpha2: Backslash-anything is an ordinary character, not an
- error (except, of course, for the handful of backslashed metacharacters
- in BREs), which should reduce script breakage. The regression test
- checks *where* null strings are supposed to match, and has generally
- been tightened up somewhat. Small bug fixes in parameter passing (not
- harmful, but technically errors) and some other areas. Debugging
- invoked by defining REDEBUG rather than not defining NDEBUG.
- New in alpha+3: full prototyping for internal routines, using a little
- helper program, mkh, which extracts prototypes given in stylized comments.
- More minor cleanup. Buglet fix: it's CHAR_BIT, not CHAR_BITS. Simple
- pre-screening of input when a literal string is known to be part of the
- RE; this does wonders for performance.
- New in alpha+2: minor bits of cleanup. Notably, the number "32" for the
- word width isn't hardwired into regexec.c any more, the public header
- file prototypes the functions if __STDC__ is defined, and some small typos
- in the manpages have been fixed.
- New in alpha+1: improvements to the manual pages, and an important
- extension, the REG_STARTEND option to regexec().