changes

tcl是工具命令语言

7/18/95 (bug fix) Fixed bugs with backslashes in comments:
Tcl_CommandComplete (and "info complete") didn't properly handle
strings ending in backslash-newline, and neither Tcl_CommandComplete
nor the Tcl parser handled other backslash sequences right, such
as two backslashes before a newline.

7/19/95 (bug fix) Modified Tcl_DeleteCommand to delete the hash table
entry for the command before invoking its callback.  This is needed in
order to deal with reentrancy.

7/22/95 (bug fix) "exec" wasn't reaping processes correctly after
certain errors (e.g. if the name of the executable was bogus, as
in "exec foobar").

7/27/95 (bug fix) Makefile.in wasn't using the LIBS variable provided
by the "configure" script.  This caused problems on some SCO systems.

7/27/95 (bug fix) The version of strtod in fixstrtod.c didn't properly
handle the case where endPtr == NULL.

----------------- Released patch 7.4p1, 7/29/95 -----------------------

8/4/95 (bug fix) C-level trace callbacks for variables were sometimes
receiving the PART1_NOT_PARSED flag, which could cause errors in
subsequent Tcl library calls using the flags. (JO)

8/4/95 (bug fix) Calls to toupper and tolower weren't using the
UCHAR macros, which caused trouble in non-U.S. locales. (JO)

8/10/95 (new feature) Added the "load" command for dynamic loading of
binary packages, and the Tcl_PackageInitProc prototype for package
initialization procedures. (JO)

8/23/95 (new features) Added "info sharedlibextension" and
"info nameofexecutable" commands, plus Tcl_FindExtension procedure. (JO)

8/25/95 (bug fix) If the target of an "upvar" was non-existent but
had traces set, the traces were silently lost.  Change to generate
an error instead. (JO)

8/25/95 (bug fix) Undid change from 7/19, so that commands can stay
around while their deletion callbacks execute.  Added lots of code to
handle all of the reentrancy problems that this opens up. (JO)

8/25/95 (bug fix) Fixed core dump that could occur in TclDeleteVars
if there was an upvar from one entry in the table to the next entry
in the same table. (JO)

8/28/95 (bug fix) Exec wasn't handling bad user names properly, as
in "exec ~bogus_user/foo". (JO)

8/29/95 (bug fixes) Changed backslash-newline handling to correct two
problems:
    - Only spaces and tabs following the backslash-newline are now
      absorbed as part of the backslash-newline.  Newlinew are no
      longer absorbed (add another backslash if you want to absorb
      another newline).
    - TclWordEnd returns the character just before the backslash in
      the sequence as the end of the sequence;  it used to not consider
      the backslash-newline as a word separator. (JO)

8/31/95 (new feature) Changed man page installation (with "mkLinks"
script) to create additional links for manual pages corresponding to
each of the procedure and command names described in the pages. (JO)

9/10/95 Reorganized Tcl sources for Windows and Mac ports.  All sources
are now in subdirectories:  "generic" contains sources that work on all
platforms, "windows", "mac", and "unix" directories contain platform-
specific sources.  Some UNIX sources are also used on other platforms. (SS)

9/10/95 (feature change) Eliminated exported global variables (they
don't work with Windows DLLs).  Replaced tcl_AsyncReady and
tcl_FileCloseProc with procedures Tcl_AsyncReady() and
Tcl_SetFileCloseProc().  Replaced C variable tcl_RcFileName with
a Tcl variable tcl_rcFileName. (SS)
*** POTENTIAL INCOMPATIBILITY ***

9/11/95 (new feature) Added procedure Tcl_SetPanicProc to override
the default implementation of "panic". (SS)

9/11/95 (new feature) Added "interp" command to allow creation of
new interpreters and execution of untrusted scripts.  Added many new
procedures, such as Tcl_CreateSlave, Tcl_CreateAlias,and Tcl_MakeSafe,
to provide C-level access to the interpreter facility. This mechanism
now provides almost all of the generic functions of Borenstein's and
Rose's Safe-Tcl (but not any Tk or email-related stuff).  (JL)

9/11/95 (feature change) Changed file management so that files are
no longer shared between interpreters:  a file cannot normally be
referenced in one interpreter if it was opened in another.  This
feature is needed to support safe interpreters.  Added Tcl_ShareHandle()
procedure for allowing files to be shared, and added "interp" argument
to Tcl_FilePermissions procedure. (JL)
*** POTENTIAL INCOMPATIBILITY ***

9/11/95 (new feature) Added "AssocData" mechanism, whereby extensions
can associate their own data with an interpreter and get called back
when the interpreter is deleted.  This is visible at C level via the
procedures Tcl_SetAssocData and Tcl_GetAssocData.  (JL)

9/11/95 (new feature) Added Tcl_ErrnoMsg to translate an errno value
into a human-readable string.  This is now used instead of calling
strerror because strerror mesages vary dramatically from platform
to platform, which messes up Tcl tests.  Tcl_ErrnoMsg uses the standard
POSIX messages for all the common signals, and calls strerror for
signals it doesn't understand.

----------------- Released patch 7.4p2, 9/15/95 -----------------------

----------------- Released 7.5a1, 9/15/95 -----------------------

9/22/95 (bug fix) Changed auto_mkindex to create tclIndex files that
handle directories whose paths might contain spaces. (RJ)

9/27/95 (bug fix) The "format" command didn't check for huge or negative
width specifiers, which could cause core dumps. (JO)

9/27/95 (bug fix) Core dumps could occur if an interactive command typed
to tclsh returned a very long result for tclsh to print out.  The bug is
actually in printf (in Solaris 2.3 and 2.4, at least);  switched to use
puts instead.  (JO)

9/28/95 (bug fix) Changed makefile.bc to eliminate a false dependency
for tcl1675.dll on the Borland run time library. (SS)

9/28/95 (bug fix) Fixed tcl75.dll so it looks for tcl1675.dll instead
of tcl16.dll. (SS)

9/28/95 (bug fix) Tcl was not correctly detecting the difference
between Win32s and Windows '95. (SS)

9/28/95 (bug fix) "exec" was not passing environment changes to child
processes under Windows. (SS)

9/28/95 (bug fix) Changed Tcl to ensure that open files are not passed
to child processes under Windows. (SS)

9/28/95 (bug fix) Fixed Windows '95 and NT versions of exec so it can
handle both console and windows apps.   (SS)

9/28/95 (bug fix) Fixed Windows version of exec so it no longer leaves
temp files lying around.  Also changed it so the temp files are
created in the appropriate system dependent temp directory. (SS)

9/28/95 (bug fix) Eliminated source dependency on the Win32s Universal
Thunk header file, since it is not bundled with VC++. (SS)

9/28/95 (bug fix) Under Windows, Tcl now constructs the HOME
environment variable from HOMEPATH and HOMEDRIVE when HOME is not
already set. (SS)

9/28/95 (bug fix) Added support for "info nameofexecutable" and "info
sharedlibextension" to the Windows version. (SS)

9/28/95 (bug fix) Changed tclsh to correctly parse command line
arguments so that backslashes are preserved under Windows. (SS)

9/29/95 (bug fix) Tcl 7.5a1 treated either return or newline as end
of line in "gets", which caused lines ending in CRLF to be treated as
two separate lines.  Changed to allow only character as end-of-line:
carriage return on Macs, newline elsewhere. (JO)

9/29/95 (new feature) Changed to install "configInfo" file in same
directory as library scripts.  It didn't used to get installed. (JO)

9/29/95 (bug fix) Tcl was not converting Win32 errors into POSIX
errors under some circumstances. (SS)

10/2/95 (bug fix) Safe interpreters no longer get initialized with
a call to Tcl_Init(). (JL)

10/1/95 (new feature) Added "tcl_platform" global variable to provide
environment information such as the instruction set and operating
system. (JO)

10/1/95 (bug fix) "exec" command wasn't always generating the
"child process exited abnormally" message when it should have.  (JO)

10/2/95 (bug fix) Changed "mkLinks.tcl" so that the scripts it generates
won't create links that overwrite original manual entries (there was
a problem where pack-old.n was overwriting pack.n).  (JO)

10/2/95 (feature change) Changed to use -ldl for dynamic loading under
Linux if it is available, but fall back to -ldld if it isn't.  (JO)

10/2/95 (bug fix) File sharing was causing refcounts to reach 0
prematurely for stdin, stdout and stderr, under some circumstances. (JL)

10/2/95 (platform support) Added support for Visual C++ compiler on
Windows, Windows '95 and Windows NT, code donated by Gordon Chaffee. (JL)

10/3/95 (bug fix) Tcl now frees any libraries that it loads before it
exits. (SS)

10/03/95 (bug fix) Fixed bug in Macintosh ls command where the -l
and -C options would fail in anything but the HOME directory. (RJ)

----------------- Released 7.5a2, 10/6/95 -----------------------

10/10/95 (bug fix) "file dirnam /." was returning ":" on UNIX instead
of "/". (JO)

10/13/95 (bug fix) Eliminated dependency on MKS toolkit for generating
the tcl.def file from Borland object files. (SS)

10/17/95 (new features) Moved the event loop from Tcl to Tk, made major
revisions along the way:
    - New Tcl commands:  after, update, vwait (replaces "tkwait variable").
    - "tkerror" is now replaced with "bgerror".
    - The following procedures are similar to their old Tk counterparts:
      Tcl_DoOneEvent, Tcl_Sleep, Tcl_DoWhenIdle, Tcl_CancelIdleCall,
      Tcl_CreateFileHandler, Tcl_DeleteFileHandler, Tcl_CreateTimerHandler,
      Tcl_DeleteTimerHandler, Tcl_BackgroundError.
    - Revised notifier, add new concept of "event source" with the following
      procedures:  Tcl_CreateEventSource, Tcl_DeleteEventSource,
      Tcl_WatchFile, Tcl_SetMaxBlockTime, Tcl_FileReady, Tcl_QueueEvent,
      Tcl_WaitForEvent. (JO)

10/31/95 (new features) Implemented cross platform file name support to make
it easier to write cross platform scripts.  Tcl now understands 4 file naming
conventions: Windows (both DOS and UNC), Mac, Unix, and Network.  The network
convention is a new naming mechanism that can be used to paths in a platform
independent fashion.  See the "file" command manual page for more details.
The primary interfaces changes are:
    - All Tcl commands that expect a file name now accept both network and
      native form.
    - Two new "file" subcommands, "nativename" and "networkname", provide a
      way to convert between network and native form.
    - Renamed Tcl_TildeSubst to Tcl_TranslateFileName, and changed it so that
      it always returns a filename in native form.  Tcl_TildeSubst is defined
      as a macro for backward compatibility, but it is deprecated. (SS)

11/5/95 (new feature) Made "tkerror" and "bgerror" synonyms, so that
either name can be used to manipulate the command (provides temporary
backward compatibility for existing scripts that use tkerror). (JO)

11/5/95 (new feature) Added exit handlers and new C procedures
Tcl_CreateExitHandler, Tcl_DeleteExitHandler, and Tcl_Exit. (JO)

11/6/95 (new feature) Added pid command for Macintosh version of
Tcl (it didn't previously exist on the Mac). (RJ)

11/7/95 (new feature) New generic IO facility and support for IO to
files, pipes and sockets based on a common buffering scheme. Support
for asynchronous (non-blocking) IO and for event driver IO. Support
for automatic (background) asynchronous flushing and asynchronous
closing of channels. (JL)

11/7/95 (new feature)  Added new commands "fconfigure" and "fblocked"
to support new I/O features such as nonblocking I/O.  Added "socket"
command for creating TCP client and server sockets. (JL).

11/7/95 (new feature) Complete set of C APIs to the new generic IO
facility:
    - Opening channels: Tcl_OpenFileChannel, Tcl_OpenCommandChannel,
      Tcl_OpenTcpClient, Tcl_OpenTcpServer.
    - I/O procedures on channels, which roughly mirror the ANSI C stdio
      library:  Tcl_Read, Tcl_Gets, Tcl_Write, Tcl_Flush, Tcl_Seek,
      Tcl_Tell, Tcl_Close, Tcl_Eof, Tcl_InputBlocked, Tcl_GetChannelOption,
      Tcl_SetChannelOption.
    - Extension mechanism for creating new kinds of channels:
      Tcl_CreateChannel, Tcl_GetChannelInstanceData, Tcl_GetChannelType,
      Tcl_GetChannelName, Tcl_GetChannelFile, Tcl_RegisterChannel,
      Tcl_UnregisterChannel, Tcl_GetChannel.
    - Event-driven I/O on channels: Tcl_CreateChannelHandler,
      Tcl_DeleteChannelHandler. (JL)

11/7/95 (new feature) Channel driver interface specification to allow
new types of channels to be added easily to Tcl. Currently being used
in three drivers - for files, pipes and TCP-based sockets. (JL).

11/7/95 (new feature) interp delete now takes any number of path
names of interpreters to delete, including zero. (JL).

11/8/95 (new feature) implemented 'info hostname' and Tcl_GetHostName
command to get host name of machine on which the Tcl process is running. (JL)

11/9/95 (new feature) Implemented file APIs for access to low level files
on each system. The APIs are: Tcl_CloseFile, Tcl_OpenFile, Tcl_ReadFile,
Tcl_WriteFile and Tcl_SeekFile. Also implemented Tcl_WaitPid which waits
in a system dependent manner for a child process. (JL)

11/9/95 (new feature) Added Tcl_UpdateLinkedVar procedure to force a
Tcl variable to be updated after its C variable changes. (JO)

11/9/95 (bug fix) The glob command has been totally reimplemented so
that it can support different file name conventions.  It now handles
Windows file names (both UNC and drive-relative) properly.  It also
supports nested braces correctly now. (SS)

11/13/95 (bug fix) Fixed Makefile.in so that configure can be run
from a clean directory separate from the Tcl source tree, and compilations
can be performed there. (JO)

11/14/95 (bug fix) Fixed file sharing between interpreters and file
transferring between interpreters to correctly manage the refcount so that
files are closed when the last reference to them is discarded. (JL)

11/14/95 (bug fix) Fixed gettimeofday implementation for the
Macintosh.  This fixes several timing related bugs. (RJ)

11/17/95 (new feature) Added missing support for info nameofexecutable
on the Macintosh. (RJ)

11/17/95 (bug fix) The Tcl variables argc