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

	* pch.c (intuit_diff_type): When creating a file, prefer a name whose
	existing dir prefix is the longest.

	* util.h (countdirs): New function.
	* util.c (replace_slashes, countdirs): New functions.
	(makedirs): Use replace_slashes, to be more like countdirs.

	* patch.man: Explain -pN vs -p N.  Recommend --new-file.
	Explain possible incompatibility with strip count.

1997-04-10  Paul Eggert  <[e-mail]>

	* configure.in (VERSION): Bump to 2.1.6.
	(AC_CHECK_HEADERS): Remove stdlib.h (i.e. remove HAVE_STDLIB_H).

	* Makefile.in: (HDRS, patchlevel.h, TAGS, distclean, maintainer-clean):
	Don't distribute patchlevel.h; let the user do it.
	This works around some obscure (possibly nonexistent?) `make' bugs.

	* common.h (program_name): extern, not XTERN.
	(<stdlib.h>): Include if STDC_HEADERS, not if HAVE_STDLIB_H.
	(atol, getenv, malloc, realloc): Don't worry whether they're #defined.

	* patch.c (get_some_switches):
	Add special hack for backwards compatibility with CVS 1.9.
	(-B, -Y, -z): Now set backup_type = simple.

	* NEWS: Fix misspellings; minor reformatting.
	* README: Report POSIX.2 compliance.

1997-04-06  Paul Eggert  <[e-mail]>

	Move all old RCS $Log entries into ChangeLog.
	#include all files with < >, not " ".

	* addext.c, argmatch.c, argmatch.h, memchr.c, install-sh:
	New files.
	* EXTERN.h, INTERN.h: Removed.
	* config.hin: Renamed from config.h.in.

	* acconfig.h (NODIR): Remove.
	(HAVE_MEMCHR): Add.

	* configure.in (AC_ARG_PROGRAM, AC_PROG_MAKE_SET, HAVE_MEMCHR): Add.
	(AC_CHECK_HEADERS): Replaces obsolescent AC_HAVE_HEADERS.
	Add stdlib.h, string.h, unistd.h, varargs.h.
	Delete obsolete call to AC_UNISTD_H.
	(AC_CONFIG_HEADER): Rename config.h.in to config.hin.
	(AC_C_CONST): Replaces obsolescent AC_CONST.
	(AC_CHECK_FUNC): Check for getopt_long; define LIBOBJS and substitute
	for it accordingly.
	(AC_CHECK_FUNCS): Replaces obsolescent AC_HAVE_FUNCS.
	Add _doprintf, isascii, mktemp, sigaction, sigprocmask, sigsetmask.
	Remove strerror.
	(AC_FUNC_CLOSEDIR_VOID, AC_FUNC_VPRINTF): Add.
	(AC_HEADER_DIRENT): Replaces obsolescent AC_DIR_HEADER.
	(AC_HEADER_STDC): Replaces obsolescent AC_STDC_HEADERS.
	(AC_SYS_LONG_FILE_NAMES): Replaces obsolescent AC_LONG_FILE_NAMES.
	(AC_TYPE_OFF_T): Replaces obsolescent AC_OFF_T.
	(AC_TYPE_SIGNAL): Replaces obsolescent AC_RETSIGTYPE.
	(AC_TYPE_SIZE_T): Replaces obsolescent AC_SIZE_T.
	(AC_XENIX_DIR): Remove.
	(ED_PROGRAM): New var.
	(NODIR): Remove.
	(PACKAGE, VERSION): New vars; substitute them with AC_SUBST.

	* Makefile.in: Conform to current GNU build standards.
	Redo dependencies.  Use library getopt_long if available.
	Use `&&' instead of `;' inside shell commands where applicable;
	GNU make requires this.
	Use double-colon rules for actions that do not build files.
	(@SET_MAKE@): Added.
	(CFLAGS, LDFLAGS, prefix, exec_prefix): Base on @ versions of symbols.
	(COMPILE, CPPFLAGS, DEFS, ED_PROGRAM, LIBOBJS, LIBSRCS, PACKAGE,
	VERSION): New symbols.
	(SRCS, OBJS, HDRS, MISC): Add new files.
	(man1dir): Renamed from mandir.
	(man1ext): Renamed from manext.
	(patch): Put -o first.
	(install): Use $(transform) to allow program to be renamed by configure.
	(patchlevel.h): Build from $(VERSION).
	(dist): Get version number from $(VERSION) and package name from
	$(PACKAGE).
	(TAGS): Scan $(HDRS).
	(maintainer-clean): Renamed from realclean.  Remove patchlevel.h.

	* backupfile.h (simple_backup_suffix): Now const *.
	(find_backup_file_name, base_name, get_version): Args are now const *.
	(base_name): New decl.
	* backupfile.c (<config.h>): Include only if HAVE_CONFIG_H.
	(<argmatch.h>): Include.
	(<string.h>): Include if HAVE_STRING_H, not if STDC_HEADERS.
	(<strings.h>): Include if !HAVE_STRING_H.
	(<unistd.h>): Do not include.
	(<dirent.h>): Redo include as per current autoconf standards.
	(<limits.h>): Include if HAVE_LIMITS_H. Define CHAR_BIT if not defined.
	(NLENGTH): Now returns size_t.
	(CLOSEDIR, INT_STRLEN_BOUND): New macros.
	(ISDIGIT): Use faster method.
	(find_backup_file_name): No longer depends on NODIR.
	Remove redundant code.
	(make_version_name): Remove; do it more portably.
	(max_backup_version): Args are now const *.
	(version_number): Simplify digit checking.
	(basename, concat, dirname): Remove.
	(argmatch, invalid_arg): Move to argmatch.c.  Simplify test for
	ambiguous args.  When reporting an error, use program_name not "patch".
	(addext): Move to addext.c.  Treat all negative values from pathconf
	like -1.  Always use long extension if it fits, even if the filesystem
	does not support long file names.
	(backup_types): Now const.

	* common.h, inp.h (XTERN): Renamed from EXT to avoid collision
	with errno.h reserved name space.

	* common.h (DEBUGGING): Now an integer; default is 1.
	(enum diff): New type.
	(diff_type): Use it instead of small integers.
	(CONTEXT_DIFF, NORMAL_DIFF, ED_DIFF, NEW_CONTEXT_DIFF, UNI_DIFF):
	Now enumerated values instead of macros.
	(NO_DIFF): New enumerated value (used instead of 0).
	(volatile): Default to the empty string if __STDC__ is not defined.
	(<signal.h>): Do not include.
	(Chmod, Close, Fclose, Fflush, Fputc, Signal, Sprintf, Strcat,
	Strcpy, Unlink, Write): Remove these macros; casts to void are
	not needed for GNU coding standards.
	(INITHUNKMAX): Move to pch.c.
	(malloc, realloc, INT_MIN, MAXLINELEN, strNE, strnNE,
	Reg1, Reg2, Reg3, Reg4, Reg5, Reg6, Reg7, Reg8, Reg9, Reg10, Reg11,
	Reg12, Reg13, Reg14, Reg15, Reg16): Remove these macros.
	(S_IXOTH, S_IWOTH, S_IROTH, S_IXGRP, S_IWGRP,
	S_IRGRP, S_IXUSR, S_IWUSR, S_IRUSR, O_RDONLY, O_RDWR):
	Define these macros, if not defined.
	(CTYPE_DOMAIN, ISLOWER, ISSPACE, ISDIGIT, PARAMS): New macros.
	(instat): Renamed from filestat; used for input file now.
	(bufsize, using_plan_a, debug, strippath): Not statically initialized.
	(debug): #define to 0 if not DEBUGGING, so that users of `debug'
	no longer need to be surrounded by `#if DEBUGGING'.
	(out_of_mem, filec, filearg, outname, toutkeep, trejkeep): Remove.
	(inname, inerrno, dry_run, origbase): New variables.
	(origprae): Now const*.
	(TMPOUTNAME, TMPINNAME, TMPPATNAME): Now const*volatile.
	(verbosity): New variable; subsumes `verbose'.
	(DEFAULT_VERBOSITY, SILENT, VERBOSE): Values in a new enum.
	(verbose): Removed.
	(VOID): Use `#ifdef __STDC__' instead of`#if __STDC__',
	for consistency elsewhere.
	(__attribute__): New macro (empty if not a recent GCC).
	(fatal_exit): Renamed from my_exit.
	(errno): Don't define if STDC_HEADERS.
	(<string.h>): Include if either STDC_HEADERS or HAVE_STRING_H.
	(memcmp, memcpy): Define if !STDC_HEADERS && !HAVE_STRING_H
	&& !HAVE_MEMCHR.
	(<stdlib.h>): Include if HAVE_STDLIB_H, not if STDC_HEADERS.
	(atol, getenv, malloc, realloc, lseek): Declare only if not defined
	as a macro.
	(popen, strcpy, strcat, mktemp): Do not declare.
	(lseek): Declare to yield off_t, not long.
	(<fcntl.h>): Include only if HAVE_FCNTL_H.

	* inp.h (get_input_file): New decl.
	* inp.c (SCCSPREFIX, GET, GET_LOCKED, SCCSDIFF, RCSSUFFIX, CHECKOUT,
	CHECKOUT_LOCKED, RCSDIFF): Moved here from common.h.
	(i_ptr): Now char const **.
	(i_size): Remove.
	(TIBUFSIZE_MINIMUM): Define only if not already defined.
	(plan_a, plan_b): Arg is now const *.
	(report_revision): Declare before use.  It's now the caller's
	responsibility to test whether revision is 0.
	(scan_input, report_revision, get_input_file):
	Be less chatty unless --verbose.
	(get_input_file): New function, split off from plan_a.
	Reuse file status gotten by pch if possible.  Allow for dry run.
	Use POSIX bits for creat, not number.  Check for creation and
	close failure, and use fstat not stat.  Use memcpy not strncpy.
	(plan_a): Rewrite for speed.
	Caller now assigns result to using_plan_a.
	Don't bother reading empty files; during dry runs they might not exist.
	Use ISSPACE, not isspace.
	(plan_b): Allow for dry runs.  Use ISSPACE, and handle sign extension
	correctly on arg.  Use POSIX symbol for open arg.

	* patch.c (backup, output, patchname, program_name): New vars.
	(last_frozen_line): Moved here from inp.h.
	(TMPREJNAME): Moved here from common.h.
	(optind_last): Removed.
	(do_defines, if_defined, not_defined, else_defined, end_defined):
	Now char const.  Prepend with \n (except for not_defined) to
	allow for files ending in non-newline.
	(Argv): Now char*const*.
	(main, get_some_switches): Exit status 0 means success,
	1 means hunks were rejected, 2 means trouble.
	(main, locate_hunk, patch_match): Keep track of patch prefix context
	separately from suffix context; this fixes several bugs.
	(main): Initialize bufsize, strippath.
	Be less chatty unless --verbose.
	No more NODIR; always have version control available.
	Require environment variables to be nonempty to have effect.
	Add support for --dry-run, --output, --verbose.
	Invoke get_input_file first, before deciding among do_ed_script,
	plan_a, or plan_b.
	Clear ofp after closing it, to keep discipline that ofp is either
	0 or open, to avoid file descriptor leaks.  Conversely, rejfp doesn't
	need this trick since static analysis is enough to show when it
	needs to be closed.
	Don't allow file-creation patches to be applied to existing files.
	Misordered hunks are now not fatal errors; just go on to the next file.
	It's a fatal error to fall back on plan B when --output is given,
	since the moving hand has writ.
	Add support for binary files.
	Check for I/O errors.
	chmod output file ourselves, rather than letting move_file do it;
	this saves global state.
	Use better grammar when outputting hunks messages, e.g. avoid
	`1 hunks'.
	(main, reinitialize_almost_everything):
	Remove support for multiple file arguments.
	Move get_some_switches call from reinitialize_almost_everything
	to main.
	(reinitialize_almost_everything): No need to reinitialize things
	that are no longer global variables, e.g. outname.
	(shortopts): Remove leading "-"; it's no longer important to
	return options and arguments in order.  '-b' no longer takes operand.
	-p's operand is no longer optional.  Add -i, -Y, -z.  Remove -S.
	(longopts): --suffix is now pared with -z, not -b.  --backup now
	means -b.  Add --input, --basename-prefix, --dry-run, --verbose.
	Remove --skip.  --strip's operand is now required.
	(option_help): New variable.  Use style of current coding standards.
	Change to match current option set.
	(usage): Use it.
	(get_some_switches): Get all switches, since `+' is defunct.
	New options -i, -Y, -z, --verbose, --dry-run.
	Option -S removed.
	-b now means backup (backup_type == simple), not simple_backup_suffix.
	-B now implies backup, and requires nonempty operand.
	-D no longer requires first char of argument to be an identifier.
	`-o -' is now disallowed (formerly output to regular file named "-").
	-p operand is now required.
	-v no longer needs to cleanup (no temp files can exist at that point).
	-V now implies backup.
	Set inname, patchname from file name arguments, if any;
	do not set filearg.  It's now an error if extra operands are given.
	(abort_junk): Check for write errors in reject file.
	(apply_hunk, copy_till): Return error flag, so that failure to apply
	out-of-order hunk is no longer fatal.
	(apply_hunk): New arg after_newline,
	for patching files not ending in newline.
	Cache ofp for speed.  Check for write errors.
	(OUTSIDE, IN_IFNDEF, IN_IFDEF, IN_ELSE): Now part of an enumerated type
	instead of being #defined to small integers.
	Change while-do to do-while when copying !-part for R_do_defines,
	since condition is always true the first time through the loop.
	(init_output, init_reject): Arg is now const *.
	(copy_till, spew_output): Do not insert ``missing'' newlines;
	propagate them via new after_newline argument.
	(spew_output): Nothing to copy if last_frozen_line == input lines.
	Do not close (ofp) if it's null.
	(dump_line): Remove.
	(similar): Ignore presence or absence of trailing newlines.
	Check for only ' ' or '\t', not isspace (as per POSIX.2).
	(make_temp): Use tmpnam if mktemp is not available.
	(cleanup): New function.
	(fatal_exit): Use it.  Renamed from my_exit.
	Take signal to exit with, not exit status (which is now always 2).

	* pch.h, pch.c (pch_prefix_context, pch_suffix_context):
	New fns replacing pch_context.
	(another_hunk): Now yields int, not bool; -1 means out of memory.
	Now takes difftype as argument.
	(pch_write_line): Now returns boolean indicating whether we're after
	a newline just after the write, for supporting non-text files.
	* pch.c (isdigit): Remove; use ISDIGIT instead.
	(INITHUNKMAX): Moved here from common.h.
	(p_context): Removed.  We need to keep track of the pre- and post-
	context separately, in:
	(p_prefix_context, p_suffix_context): New variables.
	(bestguess): Remove.
	(open_patch_file): Arg is now char const *.
	Copy file a buffer at a time, not a char at a time, for speed.
	(grow_hunkmax): Now returns success indicator.
	(there_is_another_patch, skip_to, another_hunk, do_ed_script):
	Be less chatty unless --verbose.
	(there_is_another_patch):
	Avoid infinite loop if user input keeps yielding EOF.
	(intuit_diff_type): New returns enum diff, not int.
	Strip paths as they're being fetched.
	Set ok_to_create_file correctly even if patch is reversed.
	Set up file names correctly with unidiff output.
	Use algorithm specified by POSIX 1003.2b/D11 to deduce
	name of file to patch, with the exception of patches
	that can create files.
	(skip_to): Be verbose if !inname, since we're about to ask the
	user for a file name and the context will help the user choose.
	(another_hunk): Keep context as LINENUM, not int.
	If the replacement is missing, calculate its context correctly.
	Don't assume input ends in newline.
	Keep track of patch prefix context separately from suffix context;
	this fixes several bugs.
	Don't assume blank lines got chopped if the replacement is missing.
	Report poorly-formed hunks instead of aborting.
	Do not use strcpy on overlapping strings; it's not portable.
	Work even if lines are incomplete.
	Fix bugs associated with context-less context hunks,
	particularly when patching in reverse.
	(pget_line): Now takes just 1 arg; instead of second arg,
	just examine using_plan_a global.  Return -1 if we ran out
	of memory.
	(do_ed_script): Now takes output FILE * argument.
	Take name of editor from ED_PROGRAM instead of hardwiring /bin/ed.
	Don't bother unlinking TMPOUTNAME.
	Check for popen failure.
	Flush pipe to check for output errors.
	If ofp is nonzero, copy result to it, instead of trying to
	move the result.

	* util.h, util.c (say1, say2, say3, say4, fatal1, fatal2, fatal3,
	fatal4, pfatal1, pfatal2, pfatal3, pfatal4, ask1, ask2, ask3, ask4):
	Remove; replaced with following.
	(ask, say, fatal, pfatal): New stdarg functions.
	(fetchname): Remove last, `assume_exists' parameter.
	(savebuf, savestr, move_file, copy_file): Args are now const *.
	(exit_with_signal): New function, for proper process status if
	a signal is received as per POSIX.2.
	(basename): Rename to `base_name' and move to backupfile.
	* util.c (<signal.h>): Include here, not in common.h.
	(vararg_start): New macro.
	(va_dcl, va_start, va_arg, va_end): Define if neither <stdarg.h>
	nor <varargs.h> are available.
	(SIGCHLD): Define to SIGCLD if SIGCLD is defined and
	SIGCHLD isn't.
	(private_strerror): Remove.
	(move_file): Remove option of moving to stdout.
	Add support for -Y, -z.
	Don't assume chars in file name are nonnegative.
	Use copy_file if rename fails due to EXDEV;
	report failure if rename fails for any other reason.
	(copy_file, makedirs): Use POSIX symbols for permissions.
	(copy_file): Open source before destination.