gno/bin/gsh/UpdateLog

GSH 2.0 UPDATES
^^^^^^^^^^^^^^^

Aug  2 98    [dmt] Remove alloc256/free256 and associated data. Replace
	     with fixed 64-byte buffer for command filename (hash.asm)
	     and allocation of 261-byte buffer via ~NEW for shell
	     variable name (shellvar.asm).

Aug  1 98    [dmt] Updated and expanded mmdebug.asm routines that perform
	     error checking on memory management calls. Added macros ~NEW
	     and ~DISPOSE that invoke either the real or debug routines.
	     Fixed call to read $TERM variable's length (PR#81).
	     Replace call to allocate256 in AppendHome (shell.asm) with
	     code that allocates space for $HOME plus the string parameter.

Jul 28 98    [dmt] In expandvars (expand.asm), use echoFlag=0 (not 1)
	     for ReadLine. The characters are echoed as they are typed
	     and do not need to be reprinted on stdout.

Jul 27 98    [dmt] Added error checking to the various flavors of prefix:
	      - Verify 2nd parameter is a valid directory before setting.
	      - Verify 1st parameter < 32 before displaying or setting.

Jul 26 98    [dmt] Removed last of old shell calls and calls to and code for
	     p-string routines (p2cstr, c2pstr, c2pstr2, putp, errputp).
	     Removed old shell macros and "str" from gsh.mac.  In removing
	     putp calls, found instances in pwd & prefix commands and prompt
	     handler where current directory name was assumed to be < 256
	     characters; recoded to use new routine getpfxstr.

Jul 21 98    [dmt] Changed invoke.asm to use RedirectGS instead of redirect.
	     Changed popd (in dir.asm) to get length of prefix 0 before
	     allocating its string, rather than assuming path is <= 256
	     characters. This allows directory stack to use very long names.

Jul 20 98    [dmt] Changed expand.asm to use InitWildcardGS and
	     NextWildcardGS instead of their obsolete counterparts.

Jul 20 98    [dmt] Changes up to this point checked-in to master archive.

Jul 19 98    [dmt] Changed edit.asm to use ReadIndexedGS, InitWildcardGS,
	     NextWildcardGS, instead of their obsolete counterparts.

Jul 18 98    [dmt] Changed Set_Variable, Export, UnsetVariable in cmd.asm,
	     shellvar.asm, jobs.asm, and term.asm to use new shell interface
	     (SetGS, ExportGS, UnsetVariableGS).
	     In InitTerm (term.asm), do not set TERM to gnocon if it is
	     already set.

Jul 17 98    [dmt] Changed final Read_Variable call (in edit.asm) to use
	     getenv instead.  Changed ReadVariableGS calls in hash.asm
	     and builtin.asm to also use getenv.

Jul 16 98    [dmt] Changed Read_Variable calls in history.asm and prompt.asm
	     to use getenv instead.

Jul 15 98    [dmt] Changed getenv (shellutil.asm) to use  ReadVariableGS
	     instead of Read_Variable to get value. getenv's input parameter
	     is now a pointer to a GS/OS string (not a C-string), and it
	     returns a pointer to a GS/OS result buffer with a terminating
	     null byte added. This interface change affected calls to
	     getenv in orca.asm and term.asm.

Jul 14 98    [dmt] Changed expandvars (expand.asm) to use ReadVariableGS
	     to get the value of an environment variable, allowing values
	     over 256 characters in length.

Jul 13 98    [dmt] Rewrote shellvar.asm to use newer shell calls to access
	     environment variables, so that they can be > 256 characters.
	     Combined set and setenv into the same routine, with different
	     entry points.

Jul 12 98    [dmt] In rehash command (hash.asm), read the PATH environment
	     variable with ReadVariableGS instead of Read_Variable, allowing
	     detection of true length and total length > 256 (PR # 9).

Jul  9 98    [dmt] Removed the df command (from builtin.asm).
	     Defined macro incad to increment a 4-byte address, checking
	     for overflow; replaced instances of "inc ptr" with "incad ptr".

Jul  8 98    [dmt] Changed column offset table to use a 1-word rather
	     than 1-byte entry. This resolves PR#14 (hash wouldn't
	     print beyond first 256 filenames).

Jul  7 98    [dmt] Fixed defect in unalias (alias.asm) where the double
	     quote portion of the scanner would look for a terminating
	     single quote. This resolves PR#69.

Jul  5 98    [dmt] Changed default order for copying files in $PATH dirs
	     into executable list, so earlier paths files are found first.
	     Added environment variable flag $OLDPATHMODE to make gsh
	     behave in the old (backwards order) way when necessary.
	     Discard duplicate filenames when hashing.
	     Fix PR#73: directory in $PATH with escaped space (\ ) is
	     not searched. Needed to remove the "\" before sending
	     pathname to ExpandPathGS.

Jun 29 98    [dmt] Changes up to this point checked-in to master archive.

Jun 28 98    [dmt] Added InitVar routine to shellvar.asm to read values
	     of all environment variables tracked in vardata.

Jun 25 98    [dmt] Added 2.0 versions of shell calls to gsh.mac (e.g.
	     ErrorGS, ReadVariableGS). Replaced old calls with new ones
	     for the following: ERROR to ErrorGS in builtin.asm, cmd.asm
	     dir.asm, shellvar.asm; Push[Pop]Variables to Push[Pop]VariabesGS
	     in invoke.asm, shellvar.asm, shell.asm; ReadVariable to
	     ReadVariableGS in builtin.asm and dir.asm.

Jun 23 98    [dmt] Made clear built-in a non-forked command.

Jun 21 98    [dmt] Added loop to execute(), in cmd.asm, to extract a single
	     command from the input line before sending it to command(). It
	     removes leading blanks and tabs and terminates the string at
	     the first ";" or "#".  After command() has finished, execute()
	     loops again if the previous command was terminated with a ";".
	     This change fixed both problems in bug report #12:
	     a)	All commands separated by ";" were evaluated before any
		were executed, so the following wouldn't work:
			set t_num=1 ; echo "Test number $t_num"
	     b) Odd things randomly happened when tab was the first
		character of multiple consecutive lines.

Jun 20 98    [dmt] Changed pointer arithmetic from dec or inc to adc or sbc
	     to allow for boundary condition in shell.asm.
	     In ShellExec (cmd.asm), save status from call to execute and
	     pass back to caller in Accumulator.
	     Modify table of builtins so that source is unforked; this
	     fixes bug reports #7 and #8: prefix does not work from a
	     sourced file.

Jun 18 98    [dmt] In cmd.asm, modified system() to check for null pointer,
	     since that is documented in the ORCA/C manual as legal.

Jun 15 98    [dmt] Fixed bug report #3: when wildcards were expanded, if
	     nothing was found gsh printed "No match." and terminated, even
	     if there were more arguments to parse.  Now gsh prints a message
	     "No match: <pattern> ignored" to stderr for each <pattern> that
	     does not match any filename. These changes were in expand.asm.
	     Changed mutual exclusion in cmd.asm and shellvar.asm to use
	     lock/unlock/key macros. That should be all of 'em.
                                                               
Jun 14 98    [dmt] Fixed bug report #47: when ~ is parsed and next character
	     is a delimiter ("/" or ":") and first character of $HOME does
	     not match that delimiter, replace the delimiters in $HOME to
	     match the user's value. Changed three "ora addr" to "ora addr+2"
	     (alias.asm: ora ptr; edit.asm and history.asm: ora cdcap).
	     Changed mutual exclusion in expand.asm to use lock/unlock macros.

Jun 13 98    [dmt] Wrote script to test built-in commands; found many that
	     returned status=227. Updated exit, setdebug, ps, hash, commands,
	     history, dirs, pushd, popd, jobs, fg, bg, and stop to return
	     status of 0 (modified "return" to add "2:#0").

Jun 12 98    [dmt] Squeezed about 80 bytes out of orca.o (edit built-in),
	     mainly by removing "invalid path name" error msg, since I
	     couldn't force ExpandPath to report the error and the editor
	     handles it fine.  Also tightened "whileloop" by using Y-reg
	     to index off of two pointers. Added lots of comments.

Jun 10 98    [dmt] The boolean shell environment variables (echo, pushdsilent,
	     etc.) would not work if they were set using UPPER CASE names.
	     Added routine cmpdcstr in shellutil.asm to downshift characters
	     while comparing two c strings, then called it from updatevars
	     in shellvar.asm to compare env variable names.

Jun  9 98    [dmt] Modified echo command (in builtin.asm) so it doesn't append
	     a blank to the end of everything it prints. Added comments to code.

Jun  8 98    [dmt] Added breakpoint option to setdebug (in builtin.asm) to
	     allow turning on conditional brk instructions for debugging.
	     Made "check4debug" a global word that reflects the current debug
	     state, and added "breakpoint" macro (in gsh.mac) to generate code.
	     Changed "2.0.4" to "2.0.6" within gnostr (in shell.asm).

Jun  6 98    [dmt] All the macros were extracted, compared, and collated in
	     alphabetical order into the file gsh.mac.  Six macros used by
	     other macros had to be moved to the end of the file.

	     Added direct-page/stack data segment (size 2K) to main.asm.
	     It is initialized to be filled with "?" characters, so that
	     it can be examined to see how much space is being used.

Jun  5 98    [dmt] Determined that the current sources have only two
	     differences from the gsh distributed with GNO/2.0.4:
		  In main.asm between (argloop and cmd3) the code
			ph4  #1024
			jsl  ~NEW
		  formerly was
			pea  1024
			jsl  ~NEW

		  In jobs.asm (after dokill) the error check after
			kill (pid,signum)
		  was not present.

Jun  1 98    [dmt] Changed to execvp to _execve in invoke.asm. gsh works!

24 Apr 98    [gdr] Fitted gsh sources into into GNO builds.  While gsh
	     assembles and links (abeit using the v2.0.4 termcap library),
	     it does not currently run -- it just crashes.  The changes
	     that were made includes:
	     - 'keep' lines were eliminated
	     - the 'mcopy' now takes the macro from the /obj/gno/bin/gsh
	       directory.  This is in anticipation of having the macro
	       files generated from a single source file; there is a large
	       amount of duplication.  For the moment, the makefile merely
	       copies the old macro files from the "M" directory to the
	       /obj/gno/bin/gsh directory.
	     - start each file with a dummy routine so that the source
	       code winds up in the *.o rather than the *.root file.
	     - added the 'setcom 60' directive; there were many source
	       lines that were otherwise getting truncated.

18 Nov 97    - [gdr] initial checkin into v2.0.6 repository.  No changes
	       were made to the sources.

GSH 1.1 UPDATES
^^^^^^^^^^^^^^^

 (unknown)   - Removed two references to $E0C000 in shell.asm (signal
	       handlers).  Bad Timmy!
 2/25/92 d01 - fixed a problem with the command-line aborting after certain
               built-ins are run.
 4/03/92 d02 - .ttya and .ttyb are displayed as 'ta' and 'tb' respectively in
               'ps'.
             - "USER" field has been renamed to "MMID" in 'ps'.
         d03 - removed all the extra newlines around 'There are stopped jobs'
               message.
             - 'exit' in a shell script aborts the script, instead of quitting
               gsh itself.
             - when getting a 'There are stopped jobs' message, a second
               attempt to exit the shell will result in all jobs being killed
               and the shell will exit. No commands may appear between the
               two attempts to exit. This is basically just like csh behaviour.
         d04 - motd pathname has been changed to '31:etc:motd' where 31 is the
               location of GNO, not the user directory. eventually motd will
               be removed from gsh and will be handled by login or something
               similar.
 4/07/92 d05 - ^D and TAB expansion now properly works on */ boot prefix.
 4/13/92 d06 - started work on new string vector library.
             - started new builtin - 'hash' to display all hashed files.
               Extremely preliminary.
 4/14/92 d07 - 'hash' now uses string vectors to build the hash list for
               displaying
             - fixed a problem if no files were hashed.
             - sv_alloc now makes sure there is an extra null at the end
               of the allocated string vector.
 4/20/92 d08 - 'which' puts the filename after the path for commands in
               the current directory.
         d09 - wrote a string vector function for printing the string
               vectors in columns like 'ls'. 'hash' now calls this.
 4/21/92 d10 - wrote routine for sorting string vectors...'hash' now sorts the
               list...
 4/23/92 d11 - full directory stack support!! pushd, popd, and dirs!!
         d12 - 'ps' displays 'nu' for the .null driver under TT field.
 4/25/92 d13 - Added '-l' option to 'kill'.
 6/22/92 d14 - Began writing custom stdio for the shell using GS/OS output.
 6/23/92     - minor optimization to alias hashing.
             - finished stdout and stderr for gsh.
         d15 - history file is no longer deleted on gsh start-up
             - fixed '~' printer used in 'dirs'. /usr2/ was displayed as
               ~2 if $home was /usr. Looked real dumb :) and was incorrect.
             - optimizations to job control
         d16 - echo flushes the stdio when finished.
 6/24/92     - fixed bug in system() call vector..make should work better
	       now :)
             - added a newline after 'pwd'.
             - wrote 'edit' built-in.
 6/26/92 d17 - began work on stdin for gsh. Uses GS/OS, ioctl(), etc...
             - began rewriting editor. Now uses key translation tables and
               command jump tables.
             - editor now accepts multiple character commands.
 6/27/92     - further work on editor
             - started work on termcap support in gsh. most command-line
               editing uses termcap now.
 6/28/92     - continued work on editor and termcap
             - 'clear' and 'echo' builtins now use termcap.
             - prompt now uses termcap.
             - hacked up a quick 'tset' builtin.
             - wrote keybinding function, termcap arrow keys now bound!
             - beta test release sent out
 6/29/92 d18 - if alias 'precmd' is defined, it is executed before drawing
               each prompt.
             - if $pushdsilent is set, then directory stack not displayed
               after 'pushd' and 'popd'.
             - termcap optimizations for history mechanism in editor.
             - termcap optimizations for kill-line and kill-end-of-line.
             - fixed bug in overwrite mode of editor...required too many
               returns to end line -> rts's weren't being pulled off the
               stack :)
 6/30/92     - fixed a bug in the 'which' command when displaying files in cwd.
             - the cursor is now left on when running applications.
             - added '-c' option to gsh command-line
             - wrote 'source' built-in
 7/04/92     - fixed two bugs in prompt display code.
 7/17/92     - fixed puts to not choke on NULL strings.
 7/21/92     - Temporarily added Push/PopVariables to the code
             - ospeed is now set so that padding can be done by termcap.
               This fixed the dropped characters on my Xerox terminal when
               doing screen clears.
             - fixed a bug in 'tset'. Was doing a jsr instead of jsl. oops.
             - set term can be in gshrc w/o manually doing a tset now.
             - 'ps' now scans job list to find names of 'forked' processes.
             - 'ps' nows displays tty numbers, since the ttyname is set
               in 31/etc/ttys and not necessarily second-guessed by gsh.
 7/25/92     - fixed cursor off problems.
 8/26/92 d19 - larger number of builtins can be redirected or piped.
             - Open-Apple is now mapped to meta (ESC).
             - The editor tells gnocon to translate arrows into VT100 codes.
             - fixed editor bug clearing entire line.
             - wrote 'bindkey' built-in.
 8/27/92 d20 - faster built-in searching.
             - wrote 'setenv' builtin.
 8/28/92     - termcap optimizations to word completion
             - word completion now matches variables if word starts with '$'.
 8/29/92     - only executuables are expanded if the word is a command. All
               files are expanded for arguments.
 8/30/92     - words to complete no longer need to be separated with spaces,
               ';','|', and '&' are now also recognized.
 9/01/92     - 'cd' no longer reports bad pathname syntax if $home not set.
             - 'pid' parsing now does syntax checking :)
             - kill won't allow killing process 0
             - changed 'jobs' invocation from method 0 to method 1.
             - word completion will not occur if the word contains an '=',
               single quote or double quote.
 9/03/92     - fixed memory trashing problem in 'source'
 9/04/92     - 'ps' only displays processes with the users uid. Be sure to
               use login, or you'll be the kernel's uid and get to see all
	       of the kernel's processes as your own.
 9/10/92     - forgot to 'clc' when alias not found in 'alias foo'.
 9/20/92     - fixed open-apple mapping
             - changed keyboard mapping
             - tab expands directories as the command
             - set problem with '-f' fixed
 9/21/92     - fixed 'cd' with no arguments.
             - fixed 'set foo' and 'setenv foo'.
             - fixed bug again in 'cd'.
             - 'set' and 'setenv' list exported variable names in upper case
             - fixed a probelm in puts when passed a null pointer.
             - fixed pointer bug in '~' compactor
             - wrote 256 byte buffer pool
 9/22/92     - fixed parsing bug when parsing two or more command-lines
               simultaneously.
             - wrote 1024 byte buffer pool.
             - word completion now matches built-ins
             - wordmatching ignores matches if the suffix is contained in
               the $fignore variable.
10/31/92 d21 - fixed bug in piping mechanism.
11/04/92     - fixed hashing problems.
11/17/92     - new builtin 'commands' lists all built-in commands. Try aliasing
               help to this for beginning users.
01/17/93 b01 - fixed prefix not printing correctly if zero length prefix.
             - word completion will expand to proper case.
01/20/93 b02 - removed motd printing from gsh
02/08/93     - fixed job control setting of terminal when background job
               completes.
02/09/93     - ^C & ^Z printing removed from the shell. The kernel will do
               this now.
02/17/93 b03 - gshrc is now read as '@:gshrc'
03/02/93     - 'set' automatically detects changing $term and auto-peforms a
	       tset. manually typing 'tset' is no longer required though it is
	       still included.
             - prompts can now contain \n,\r,\t,\b.
03/10/93     - updated automatic variable setting code. works faster now.
             - optimized low-level string routines
03/25/93     - fixed NULL commands aborting entire command-lines.
04/04/93     - history commands can now be greater than 256 characters, though
	       when being read, they are clipped to 1024.
             - the history file location has been moved to '@:history'
             - if $ignoreeof is set, then EOF (^D) will not quit the shell.
             - %U and %u will start and end underlining in prompts.
04/22/93 b04 - 'df' displays device numbers
             - gsh now takes commands as command-line input. ie.,
	       'gsh echo hello, world' will start gsh then gsh will run echo.
             - fixed a nasty shell script bug that basically rendered it
	       useless.
             - fixed memory trashing in shell scripts.
             - fixed memory trashing in histories.
04/26/94 b05 - which no longers displays the command-name first.