changelog

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

	* analyze.c: Add external function declarations.
	* analyze.c (build_script): Turn off explicit check for final newline.

	* analyze.c (discard_confusing_lines): Make integers unsigned.

Tue Jul 31 21:37:16 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* io.c (find_and_hash_each_line): Correct the criterion
	for leaving out the newline from the end of the line.

Tue May 29 21:28:16 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* dir.c (diff_dirs): Free things only if nonzero.

Mon Apr 16 18:31:05 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.h (NDIR_IN_SYS): New macro controls location of ndir.h.

	* diff3.c (xmalloc, xrealloc): Don't die if size == 0 returns 0.

Sun Mar 25 15:58:42 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* analyze.c (discard_confusing_lines):
	`many' wasn't being used; use it.
	Cancelling provisionals near start of run must handle already
	cancelled provisionals.
	Cancelling subruns of provisionals was cancelling last nonprovisional.

Sat Mar 24 14:02:51 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* analyze.c (discard_confusing_lines):
	Threshold for line occurring many times scales by square root
	of total lines.
	Within each run, cancel any long subrun of provisionals.
	Don't update `provisional' while cancelling provisionals.
	In big outer loop, handle provisional and nonprovisional separately.

Thu Mar 22 16:35:33 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* analyze.c (discard_confusing_lines):
	The first loops to discard provisionals from ends failed to step.
	In second such loops, keep discarding all consecutive provisionals.
	Increase threshold for stopping discarding, and also check for
	consecutive nondiscardables as separate threshold.

Fri Mar 16 00:33:08 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff3.c (read_diff): Pass -- as first arg to diff.

	* diff3.c: Include wait.h or define equivalent macros.
	(read_diff): Don't use stdio printing error in the inferior.
	Remember the pid and wait for it.  Report failing status.
	Report failure of vfork.

Sun Mar 11 17:10:32 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff3.c (main): Accept -t options and pass to output_diff3_edscript.
	(usage): Mention -t.
	(read_diff): Use vfork.
	(vfork): Don't use it on Sparc.

	* diff.h (vfork): Don't use it on Sparc.

Tue Mar  6 22:37:20 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff3.c (dup2): Don't define on Xenix.

	* Makefile: Comments for Xenix.

Thu Mar  1 17:19:23 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* analyze.c (diff_2_files): `message' requires three args.

Fri Feb 23 10:56:50 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* diff.h, util.c, diff3.c: Change 'void *' to 'VOID *', with
	VOID defined as void if __STDC__, char if not.

Sun Feb 18 20:31:58 1990  David J. MacKenzie  (djm at albert.ai.mit.edu)

	* Makefile: Add rules for getopt.c, getopt1.c, getopt.h.

	* getopt.c, getopt.h, getopt1.c: New files.

	* main.c (main, usage): Add long options.

	* analyze.c (shift_boundaries): Remove unused var 'j_end'.

Thu Feb  8 02:43:16 1990  Jim Kingdon  (kingdon at pogo.ai.mit.edu)

	* GNUmakefile: include ../Makerules before Makefile.

Fri Feb  2 23:21:38 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* analyze.c (diif_2_files): If -B or -I, don't return 1
	if all changes were ignored.

Wed Jan 24 20:43:57 1990  Richard Stallman  (rms at albert.ai.mit.edu)

	* diff3.c (fatal): Output to stderr.

Thu Jan 11 00:25:56 1990  David J. MacKenzie  (djm at hobbes.ai.mit.edu)

	* diff.c (usage): Mention -v.

Wed Jan 10 16:06:38 1990  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff3.c (output_diff3_edscript): Return number of overlaps.
	(main): If have overlaps, exit with status 1.

Sun Dec 24 10:29:20 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* io.c (find_equiv_class): Fix typo that came from changing init of B
	to an assigment.

	* version.c: New file.
	* diff.c (main): -v prints version number.

	* io.c (binary_file_p): Null char implies binary file.

Fri Nov 17 23:44:55 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* util.c (print_1_line): Fix off by 1 error.

Thu Nov 16 13:51:10 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* util.c (xcalloc): Function deleted.

	* io.c (slurp): Null-terminate the buffer.

	* io.c (read_files): Delete unused vars.

	* io.c (find_equiv_class): Don't index by N if too low.

	* dir.c (dir_sort): Delete the extra declaration of compare_names.

	* diff.h: Don't declare xcalloc.  Declare some other functions.

	* analyze.c (shift_boundaries):
	Test for END at end of range before indexing by it.
	Fix typo `preceeding' in var names.

Sat Nov 11 14:04:16 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff3.c (using_to_diff3_block): Delete unused vars.
	(make_3way_diff, process_diff_control, read_diff, output_diff3): Likewise.

Mon Nov  6 18:15:50 EST 1989 Jay Fenlason ([e-mail])

	* README Fix typo.

Fri Nov  3 15:27:47 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.c (usage): Mention -D.

	* ifdef.c (print_ifdef_hunk): Write comments on #else and #endif.

Sun Oct 29 16:41:07 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.c (compare_files): Don't fflush for identical files.

Wed Oct 25 17:57:12 1989  Randy Smith  (randy at apple-gunkies.ai.mit.edu)

	* diff3.c (using_to_diff3_block): When defaulting lines from
	FILE0, only copy up to just under the *lowest* line mentioned
	in the next diff.

	* diff3.c (fatal): Add \n to error messages.

Wed Oct 25 15:05:49 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* Makefile (tapefiles): Add ChangeLog.

Tue Oct  3 00:51:17 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff3.c (process_diff, create_diff3_block): Init ->next field.

Fri Sep 29 08:16:45 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* util.c (line_cmp): Alter end char of line 2, not line 1.

Wed Sep 20 00:12:37 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* Makefile (diff.tar): Expect ln to fail on some files;
	copy them with cp.

Mon Sep 18 02:54:29 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* Handle -D option:
	* io.c (find_and_hash_each_line): Keep all lines of 1st file.
	* diff.c (main): Handle -D option.
	(compare_files): Reject -D if files spec'd are directories.
	* analyze.c (diff_2_files): Handle OUTPUT_IFDEF case.

Fri Sep  1 20:15:50 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.c (option_list): Rename arg VECTOR as OPTIONVEC.

Mon Aug 28 17:58:27 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.c (compare_files): Clear entire inf[i].stat.

Wed Aug 23 17:48:47 1989  Richard Stallman  (rms at apple-gunkies.ai.mit.edu)

	* io.c (find_identical_ends): Sign was backward
	determining where to bound the scan for the suffix.

Wed Aug 16 12:49:16 1989  Richard Stallman  (rms at hobbes.ai.mit.edu)

	* analyze.c (diff_2_files): If -q, treat all files as binary.
	* diff.c (main): Detect -q, record in no_details_flag.

Sun Jul 30 23:12:00 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.c (usage): New function.
	(main): Call it.

Wed Jul 26 02:02:19 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.c (main): Make -C imply -c.

Thu Jul 20 17:57:51 1989  Chris Hanson  (cph at kleph)

	* io.c (find_and_hash_each_line): Bug fix in context handling,
	introduced by last change.

Fri Jul 14 17:39:20 1989  Chris Hanson  (cph at kleph)

	* analyze.c: To make RCS work correctly on files that don't
	necessarily end in newline, introduce some changes that cause
	diffs to be sensitive to missing final newline.  Because
	non-RCS modes don't want to be affected by these changes, they
	are conditional on `output_style == OUTPUT_RCS'.
	(diff_2_files) [OUTPUT_RCS]: Suppress the "File X missing
	newline" message.
	(build_script) [OUTPUT_RCS]: Cause the last line to compare as
	different if exactly one of the files is missing its final
	newline.

	* io.c (find_and_hash_each_line): Bug fix in
	ignore_space_change mode.  Change line's length to include the
	newline.  For OUTPUT_RCS, decrement last line's length if
	there is no final newline.
	(find_identical_ends) [OUTPUT_RCS]: If one of the files is
	missing a final newline, make sure it's not included in either
	the prefix or suffix.

	* util.c (print_1_line): Change line output routine to account
	for line length including the newline.

Tue Jun 27 02:35:28 1989  Roland McGrath  (roland at hobbes.ai.mit.edu)

	* Makefile: Inserted $(archpfx) where appropriate.

Wed May 17 20:18:43 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff3.c [USG]: Include fcntl.h.

	* diff.h [USG]: New compilation flags HAVE_NDIR, HAVE_DIRECT.

Wed Apr 26 15:35:57 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* dir.c (diff_dirs): Two new args, NONEX1 and NONEX2, say to pretend
	nonex dirs are empty.
	(dir_sort): New arg NONEX, likewise.
	* diff.c (compare_files): Pass those args.
	Sometimes call diff_dirs if subdir exists in just one place.

Wed Apr 12 01:10:27 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* io.c (find_identical_ends): Set END0 *after* last char
	during backward scan for suffix.

Sat Apr  8 15:49:49 1989  Randall Smith  (randy at apple-gunkies.ai.mit.edu)

	* diff3.c (using_to_diff3_block): Now find high marks in files 1
	and 2 through mapping off of the last difference instead of the
	first.

	* diff3.c: Many trivial changes to spelling inside comments.

Fri Feb 24 12:38:03 1989  Randall Smith  (randy at gluteus.ai.mit.edu)

	* util.c, normal.c, io.c, ed.c, dir.c, diff.h, diff.c, context.c,
	analyze.c, Makefile: Changed copyright header to conform with new
	GNU General Public license.
	* diff3.c: Changed copyright header to conform with new GNU
	General Public license.
	* COPYING: Made a hard link to /gp/rms/COPYING.

Fri Feb 24 10:01:58 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* io.c (slurp): Leave 2 chars space at end of buffer, not one.
	(find_identical_ends): Special case if either file is empty;
	don't try to make a sentinel since could crash.

Wed Feb 15 14:24:48 1989  Jay Fenlason  (hack at apple-gunkies.ai.mit.edu)

	* diff3.c (message)  Re-wrote routine to avoid using alloca()

Wed Feb 15 06:19:14 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* io.c (find_identical_ends): Delete the variable `bytes'.

Sun Feb 12 11:50:36 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* io.c (slurp): ->bufsize is nominal amount we have room for;
	add room for sentinel when calling xmalloc or xrealloc.

	* io.c (find_identical_ends): Do need overrun check in finding suffix.

Fri Feb 10 01:28:15 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* diff.c (main): -C now takes arg to specify context length.
	Now -p to show C function name--Damned IEEE!
	Fatal error if context length spec'd twice.

	* ed.c (print_ed_hunk): Now special treatment only for lines containing
	precisely a dot and nothing else.  Output `..', end the insert,
	substitute that one line, then resume the insert if nec.

	* io.c (find_and_hash_lines): When backing up over starting context,
	don't move past buffer-beg.

	* io.c (find_identical_ends): Use sentinels to make the loops faster.
	If files are identical, skip the 2nd loop and return quickly.
	(slurp): Leave 1 char extra space after each buffer.

	* analyze.c (diff_2_files): Mention difference in final newlines.

Wed Jan 25 22:44:44 1989  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* dir.c (diff_dirs): Use * when calling fcn ptr variable.

Sat Dec 17 14:12:06 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* Makefile: New vars INSTALL and LIBS used in some rules;
	provide default defns plus commented-put defns for sysV.

Thu Nov 17 16:42:53 1988  Richard Stallman  (rms at sugar-bombs.ai.mit.edu)

	* dir.c (dir_sort): Open-trouble not fatal; ju