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- /*
- * MicroEMACS 3.9
- * written by Dave G. Conroy.
- * substatially modified by Daniel M. Lawrence
- *
- * (C)opyright 1987 by Daniel M. Lawrence
- * MicroEMACS 3.9 can be copied and distributed freely for any
- * non-commercial purposes. MicroEMACS 3.9 can only be incorporated
- * into commercial software with the permission of the current author.
- *
- * This file contains the main driving routine, and some keyboard processing
- * code, for the MicroEMACS screen editor.
- *
- * REVISION HISTORY:
- *
- * 1.0 Steve Wilhite, 30-Nov-85
- * - Removed the old LK201 and VT100 logic. Added code to support the
- * DEC Rainbow keyboard (which is a LK201 layout) using the the Level
- * 1 Console In ROM INT. See "rainbow.h" for the function key defs
- * Steve Wilhite, 1-Dec-85
- * - massive cleanup on code in display.c and search.c
- *
- * 2.0 George Jones, 12-Dec-85
- * - Ported to Amiga.
- *
- * 3.0 Daniel Lawrence, 29-Dec-85
- * - rebound keys/added new fast buffered I/O for AMIGA
- * - added META- repeat commands
- * - added reposition default to center screen (yeah!)
- * - changed exit with modified buffers message
- * - made filesave tell us what it is doing
- * - changed search string entry to terminate with <ESC>
- * so we can use <NL> in search/replace strings
- * - updated version number in mode line to 3.0
- * 12-Jan-86
- * - Added code to reconize the search/replace functions
- * - Added code to perform search/replace & query functions
- * 14-Jan-86
- * - moved search logic to separate function in search.c
- * - added replace and query replace functions
- * - separated out control key expansions to be used by others in search.c
- * 15-Jan-86
- * - changed "visiting" to finding
- * - changed yes/no responses to not need return
- * - cleaned up various messages
- * 16-jan-86
- * - fixed spurious spawn message in MSDOS
- * - added ^X-S synonym to save command
- * - moved escape to shell to ^X-C
- * 21-jan-86
- * - added code to suspend shell under BSD
- * 22-jan-86
- * - added function key support (SPEC) under MSDOS
- * - Abort now prints [Aborted] on message line
- * 23-jan-86
- * - Added modes and commands to set/unset them
- * 24-jan-86
- * - Added Goto Line command
- * - added Rename Buffer command
- * 28-jan-86
- * - added goto beginning and end of paragraph commands (META-P/META-N)
- * - re-wrote kdelete to use realloc. Gained MUCH speed here when
- * doing large wipes on both UNIX and MSDOS. Changed kill buffer
- * allocation block size from 256 bytes to 1 k
- * 29-jan-86
- * - moved extern function declarations to efunc.h
- * - made name[] name binding table
- * 30-jan-86
- * - fixed Previous/Next paragraph command not to wrap around EOF
- * - added Fill Paragraph command (META-Q)
- * 4-feb-86
- * - added code to properly display long lines, scrolling them right
- * to left
- * 5-feb-85
- * - rewrote code to right/left scroll...much better
- * - added shifted arrow keys on IBMPC
- * 6-feb-85
- * - add option to allow forward-word to jump to beginning of
- * next word instead of end of current one. This is different from
- * other emacs' but can be configured off in estruct.h
- * - added VIEW mode to allow a buffer to be read only
- * (-v switch on command line will activate this)
- * - changed quick exit to write out ALL changed buffers!!!
- * MAKE SURE YOU KNOW THIS WHEN META-Zing
- * 10-feb-86
- * - added handling of lines longer than allowed on file read in
- * (they wrap on additional lines)
- * - made having space clear the message line and NOT insert itself
- * a configuration option in ed.h
- * 11-feb-86
- * - added Describe-command and Help commands.
- * 13-feb-86
- * - added View file command (^X ^V) and finished HELP command
- * 14-feb-86
- * - added option to let main loop skip update if type ahead commands
- * are queued up
- * 16-feb-86
- * - added Insert File command
- * 17-feb-86
- * - added scroll next window up/down commands
- * 18-feb-86
- * - added CMODE indentation
- * - re-arranged header files to standardize extern and global
- * definitions
- * - changed version number to 3.2
- * - added numeric arguments to search, reverse search and
- * search and replace
- * 24-feb-86
- * - added Bind To Key function (^C for now) to allow the user
- * to change his command keys
- * - added Unbind key function (M-^C for now)
- * - added execute named command to execute unbound commands (M-X)
- * - added describe bindings command (not bound)
- * - changed version number to 3.3
- * 25-feb-86
- * - scrapped CERROR mode (too many compilers)
- * - added EXACT mode for case sensitive searchers
- * 26-feb-86
- * - added command completion on execute named command and
- * all routined grabbing a command name
- * - adding execute-command-line command and its support functions
- * (in preparation for sourcing files)
- * - added Execute Buffer command
- * 27-feb-86
- * - added execute(source) file command and added code to automatically
- * execute emacs.rc (or .emacsrc on UNIX) before initial read in
- * - changed version number to 3.4
- * 4-mar-86
- * - changed word delete to be consistant with word move (it gets
- * rid of the inter word space now) This is configurable with the
- * NFWORD symbol in estruct.h
- * - added B_ACTIVE entry to the buffer table. Let emacs read multiple
- * file names from the command line and only read them in as needed
- * 5-mar-85
- * - rewrote command line parser to get rid of my patchy code
- * - changed version number to 3.5
- * 1-apr-86
- * - added support for Aztec C 3.20e under MSDOS
- * - fixed bug in mlwrite on ADM3's and their ilk under V7
- * - added insertion of pounds in column one under CMODE
- * - changed version number to 3.6
- * 3-apr-86
- * - added next-buffer command (^X-X)
- * 5-apr-86
- * - added kill paragraph command (M-^W)
- * - changed fill-paragraph to leave 2 spaces after a period at the
- * end of a word.
- * - added OVERWRITE mode
- * 7-apr-86
- * - fixed overwrite mode to handle tabs
- * 8-apr-86
- * - added add/delete global mode (<ESC>M & <ESC> ^M) commands
- * 9-apr-86
- * - added insert space command
- * - moved bindings around ^C insert space
- * M-K bind-to-key
- * INSERT insert space
- * DELETE forwdel
- * - added hunt forward and hunt reverse commands
- * 10-apr-86
- * - fixed bug in DOBUF with non-terminated command string
- * 15-apr-86
- * - fixed tab expansion bug in DISPLAY which hung the AMIGA
- * (sent in by Dawn Banks)
- * - fixed curcol problen if forwline/backline during keyboard
- * macro execution (sent in by Ernst Christen)
- * - added AMIGA function/cursor key support
- * - fixed nonterminating <NL> replacement bug
- * - fixed word wrapping problems
- * 16-apr-86
- * - updated documentation and froze development for 3.6 net release
- * 23-apr-86 version 3.6a
- * - added foreground and background colors. Setable with the
- * add mode commands for the moment
- * 24-apr-86
- * - added command to pipe CLI output to a buffer
- * 25-apr-86
- * - added Dana Hoggatt's code to replace Lattice's sick system()
- * function. Now we no longer care what the switchar is.
- * - cleaned up the positioning on several of the spawing commands
- * 26-apr-86
- * - added an output flush in vttidy(). Unix really appreciates this.
- * - added filter-buffer (^X#) command to send a buffer through
- * a DOS filter
- * - made automatic CMODE on .c and .h file compilation dependant
- * in estruct.h
- * 1-may-86
- * - optimized some code in update(). It certainly need a lot more.
- * - added Aztec profiling capabilities. These are conditional on
- * the APROF symbol in estruct.h
- * 2-may-86
- * - added (u)ndo command in query-replace. undoes last repalce.
- * 6-may-86
- * - re-organized and wrote the update() function in display.c
- * Now my color hacks are in the right places and the code can be
- * understood.
- * [Released version 3.6f for BETA test sites]
- * 8-may-86
- * - fixed bug in new display routine to wrap cursor on extended
- * lines at the right time
- * - modified the buffer-position command to give reasonable info
- * 9-may-86
- * - improved the word wrap algorithm as not to discard non-space
- * delimiters. The backscan now looks for white space rather than
- * !inword().
- * [Released version 3.6g to Krannert]
- * 10-may-86
- * - Added IBMPC.C an IBM-PC specific display driver. This makes paging
- * 4-6 times faster. Also made some conditional changes to DISPLAY.C
- * to eliminate the pscreen[] if using the PC driver.
- * [changed version number to 3.6i]
- * 12-may-86
- * - added delete-window (^X 0) command to dispose of a single window
- * - fixed problem with multiple prefixes from a command line which
- * was reported by John Gamble
- * 14-may-86
- * - Added Aztec support for the IBMPC display driver. Had to
- * readjust some includes and defines for this.
- * - fixed bug in delete-window.
- * - fixed some bizarre behavior with the cursor after coming back
- * from spawn calls.
- * [changed version number to 3.7 freezing development for net release]
- * 15-may-86
- * - (that didn't last long...) Added execute-macro-(1 thru 20) commands
- * to execute macro buffers (named "[Macro nn]")
- * - changed BFTEMP to BFINVS and cleaned up treatment of invisible
- * buffers.
- * 16-may-86
- * - added store-macro (unbound) to store any executed command lines to
- * macro buffer.
- * - added clear-message-line (unbound) command to do just that
- * - added resize-window command to change a window's size to the
- * specified argument
- * - improved help's logic not to re-read the file if it was already
- * in a buffer
- * - added MAGIC mode to all structures and command tables, but the
- * regular expression code that John Gamble is writing is not ready.
- * 18-may-86
- * - added interactive prompt requests in command line execution (i.e.
- * while executing a macro, a parameter starting with an at sign (@)
- * causes emacs to prompt with the rest of the parameter and return
- * the resulting input as the value of the parameter).
- * - added arguments to split-current-window to force the cursor into
- * the upper or lower window.
- * 20-may-86
- * - added support for the Microsoft C compiler as per the changes
- * sent in by Oliver Sharp
- * - made some upgrades and fixes for VMS sent in by Guy Streeter
- * 21-may-86
- * - fixed an Aztec bug in ttgetc by clearing the upper byte
- * - fixed buf in CMODE with #preprocesser input (bug fix submitted by
- * Willis of unknown path)
- * - added support of alternative startup file ( @<filename> ) in
- * the command line
- * - added ^Q quoting in interactive input (mlreplyt()).
- * - added re-binding of meta-prefix and ctlx-prefix
- * 22-may-86
- * - reorganized getkey routines to make more sense and let prefix
- * binding work properly.
- * 23-may-86
- * - checked new code on BSD4.2 and made a few fixes
- * - added optional fence matching while in CMODE
- * - added goto and search command line arguments by Mike Spitzer
- * 26-may-86
- * - added parameter fetching from buffers
- * 27-may-86
- * - fixed some HP150 bugs......
- * 31-may-86
- * - Added Wang PC keyboard support from modifications by
- * Sid Shapiro @ Wang Institute
- * - Fixed some reverse video bugs with code submitted by Peter Chubb
- * - Fixed bug in nextbuffer reported by Dave Forslund
- * - added system V support (USG) from Linwood Varney
- * 2-jun-86
- * - changed defines to just define one Unix define (for example,
- * just define BSD for Unix BSD 4.2)
- * - Added Incremental search functions written by D. R. Banks
- * in file ISEARCH.C
- * - added insert-string (unbound) command to help the macro
- * language out.
- * - added unmark-buffer (M-~) command to turn off the current buffers
- * change flag
- * - fixed nxtarg to truncate strings longer than asked for max length
- * 4-jun-86
- * - added special characters in command line tokens. Tilde (~) is
- * the special lead-in character for "nrtb".
- * - Fixed bad ifdef in Aztec code so it could look at HOME dir
- * for startup, help, and emacs.rc files
- * 6-jun-86
- * - make delete word commands clear the kill buffer if not after another
- * kill command
- * 11-jun-86
- * - made ~@ in string arguments pass as char(192) to nxtarg() so one can
- * quote @ at the beginning of string arguments
- * - changed buffer size vars in listbuffers() to long (for big files)
- * - re-wrote buffer-position command to be much faster
- * 12-jun-86
- * - added count-words (M-^C) command to count the words/chars and
- * lines in a region
- * - changed regions so they could be larger than 65535 (short ->
- * long in the REGION structure)
- * - changed ldelete() and all callers to use a long size. The kill
- * buffer will still have a problem >65535 that can not be solved
- * until I restructure it.
- * - grouped paragraph commands and word count together under symbol
- * WORDPRO to allow them to be conditionally made (or not)
- * 13-jun-86
- * - re-wrote kill buffer routines again. Now they support an unlimited
- * size kill buffer, and are (in theory) faster.
- * - changed delete-next-word (M-D) to not eat the newline after a word,
- * instead it checks and eats a newline at the cursor.
- * 17-jun-86
- * - added numeric argument to next/previous-window to access the nth
- * window from the top/bottom
- * - added support for the Data General 10 MSDOS machine
- * - added save-window (unbound) and restore-window (unbound) commands
- * for the use of the menu script. Save-window remembers which window
- * is current, and restore-window returns the cursor to that window.
- * 20-jun-86
- * - fixed a bug with the fence matching locking up near the beginning
- * of a buffer
- * - added argument to update to selectively force a complete update
- * - added update-screen (unbound) command so macros can force a
- * screen update
- * 21-jun-86
- * - rearranged token() and nxtarg() calls so that command names and
- * repeat counts could also be prompted and fetched from buffers
- * [this broke later with the exec re-write....]
- * - added write-message (unbound) command to write out a message
- * on the message line (for macros)
- * - changed ifdef's so that color modes are recognized as legal in
- * b/w version, and simply do nothing (allowing us to use the same
- * script files)
- * [Released version 3.7 on July 1 to the net and elswhere]
- * 2-jul-86
- * - Changed search string terminator to always be the meta character
- * even if it is rebound.
- * 3-jul-86
- * - removed extra calls to set color in startup code. This caused the
- * original current window to always be the global colors.
- * 7-jul-86
- * - Fixed bugs in mlreplyt() to work properly with all terminators
- * including control and spec characters
- * 22-jul-86
- * - fixed replaces() so that it will return FALSE properly on the
- * input of the replacement string.
- * - added a definition for FAILED as a return type.....
- * - changed version number to 3.7b
- * 23-jul-86
- * - fixed o -> 0 problem in TERMIO.C
- * - made ^U universal-argument re-bindable
- * - wrote atoi() for systems (like Aztec) where it acts strangely
- * - changed version number to 3.7c
- * 25-jul-86
- * - make ^G abort-command rebindable
- * 29-jul-86
- * - added HP110 Portable Computer support
- * - changed version number to 3.7d
- * 30-jul-86
- * - Fixed a couple of errors in the new VMS code as pointer
- * out by Ken Shacklford
- * - split terminal open/close routines into screen and keyboard
- * open/close routines
- * - closed the keyboard during all disk I/O so that OS errors
- * can be respoded to correctly (especially on the HP150)
- * - changed version number to 3.7e
- * 31-jul-86
- * - added label-function-key (unbound) command under symbol FLABEL
- * (primarily for the HP150)
- * 4-aug-86
- * - added fixes for Microsoft C as suggested by ihnp4!ihuxm!gmd1
- * <<remember to fix [list] deletion bug as reported
- * by craig@hp-pcd>>
- * 8-aug-86
- * - fixed beginning misspelling error everywhere
- * - fixed some more MSC errors
- * - changed version number to 3.7g
- * 20-aug-86
- * - fixed CMODE .h scanning bug
- * - changed version number to 3.7h
- * 30-aug-86
- * - fixed killing renamed [list] buffer (it can't) as submitted
- * by James Aldridge
- * - Added code to allow multiple lines to display during
- * vertical retrace
- * [total disaster....yanked it back out]
- * 9-sep-86
- * - added M-A (apropos) command to list commands containing a substring.
- * - fixed an inefficiency in the display update code submitted
- * by William W. Carlson (wwc@pur-ee)
- * 10-sep-86
- * - added Dana Hoggatt's code for encryption and spliced it into the
- * proper commands. CRYPT mode now triggers encryption.
- * - added -k flag to allow encryption key (no spaces) in command line
- * 14-sep-86
- * - added missing lastflag/thisflag processing to docmd()
- * - changed version to 3.7i and froze for partial release via mail
- * and BBS
- * 05-oct-86
- * - changed some strcpys in MAIN.C to strncpys as suggested by John
- * Gamble
- * - replaces SEARCH.C and ISEARCH.C with versions modified by
- * John Gamble
- * 10-oct-86
- * - removed references to lflick....it just won't work that way.
- * - removed defines LAT2 and LAT3...the code no longer is Lattice
- * version dependant.
- * 14-oct-86
- * - changed spawn so that it will not not pause if executed from
- * a command line
- * 15-oct-86
- * - added argument concatination (+) to the macro parsing
- * - added [] as fence pairs
- * 16-oct-86
- * - rewrote all macro line parsing routines and rearranged the
- * mlreply code. Saved 6K!!! Have blazed the path for expanding
- * the command language.
- * 17-oct-86
- * - added new keyboard macro routines (plus a new level to the
- * input character function)
- * 22-oct-86
- * - improved EGA cursor problems
- * - added -r (restricted) switch to command line for BBS use
- * 06-nov-86
- * - fixed terminator declarations from char to int in getarg() and
- * nxtarg() in EXEC.C as pointed out by John Gamble
- * 07-nov-86
- * - made wordrap() user callable as wrap-word (M-FNW) and changed
- * the getckey() routine so that illegal keystrokes (too many
- * prefixes set) could be used for internal bindings. When word
- * wrap conditions are met, the keystroke M-FNW is executed. Added
- * word wrap check/call to newline().
- * 11-nov-86
- * - added and checked support for Mark Williams C 86
- * 12-nov-86
- * - added goto-matching-fence (M-^F) command to jump to a matching
- * fence "({[]})" or beep if there is none. This can reframe the
- * screen.
- * - added code and structure elements to support change-screen-size
- * command (M-^S) to change the number of lines being used by
- * MicroEMACS.
- * 15-nov-86
- * - finished debugging change-screen-size
- * 17-nov-86
- * - Incorporated in James Turner's modifications for the Atari ST
- * 23-sep-86
- * - added support for the Atari ST line of computers (jmt)
- * - added a '\r' to the end of each line on output and strip
- * it on input for the SHOW function from the desktop
- * - added 3 new mode functions (HIREZ, MEDREZ, and LOREZ);
- * chgrez routine in TERM structure; and MULTREZ define in
- * ESTRUCT.H to handle multiple screen resolutions
- * [note....ST still not running under Lattice yet...]
- * 25-nov-86
- * - Made the filter-buffer (^X-#) command not work on VIEW mode
- * buffers
- * - Made the quick-exit (M-Z) command throw out a newline after
- * each message so they could be seen.
- * 26-nov-86
- * - fixed a couple of bugs in change-screen-size (M-^S) command
- * - changed file read behavior on long lines and last lines
- * with no newline (it no longer throws the partial line out)
- * - [as suggested by Dave Tweten] Made adding a ^Z to the end
- * of an output file under MSDOS configurable under the
- * CTRL-Z symbol in ESTRUCT.H
- * - [Dave Tweten] Spawn will look up the "TMP" environment variable
- * for use during various pipeing commands.
- * - [Dave Tweten] changed pipe command under MSDOS to use '>>'
- * instead of '>'
- * 04-dec-86
- * - moved processing of '@' and '#' so that they can be outside
- * the quotes in an argument, and added hooks to process '%' for
- * environment and user variables.
- * - modified IBMPC.C to sense the graphics adapter (CGA and MONO)
- * at runtime to cut down on the number of versions.
- * 05-dec-86
- * - changed macro directive character to "!" instead of "$" (see
- * below) and fixed the standard .rc file to comply.
- * - added code to interpret environment variables ($vars). Added
- * hooks for built in functions (&func). So, to recap:
- *
- * @<string> prompt and return a string from the user
- * #<buffer name> get the next line from a buffer and advance
- * %<var> get user variable <var>
- * $<evar> get environment variable <evar>
- * &<func> evaluate function <func>
- *
- * - allowed repeat counts to be any of the above
- * - added code to allow insert-string (unbound) to use its
- * repeat count properly
- * - added set (^X-A) command to set variables. Only works on
- * environmental vars yet.
- * 9-dec-86
- * - added some code for user defined variables...more to come
- * - added options for malloc() memory pool tracking
- * - preliminary user variables (%) working
- * - changed terminal calls to macro's (to prepare for the new
- * terminal drivers)
- * 15-dec-86
- * - changed previous-line (^P) and next-line (^N) to return a
- * FALSE at the end or beginning of the file so repeated
- * macros involving them terminate properly!
- * - added code for $CURCOL and $CURLINE
- * 20-dec-86
- * - set (^X-A) now works with all vars
- * - added some new functions
- * &ADD &SUB &TIMES &DIV &MOD &NEG &CAT
- * - once again rearranged functions to control macro execution. Did
- * away with getarg()
- * 23-dec-86
- * - added string functions
- * &LEFt &RIGht &MID
- * 31-dec-86
- * - added many logical functions
- * &NOT &EQUal &LESs &GREater
- * - added string functions
- * &SEQual &SLEss &SGReater
- * - added variable indirection with &INDirect
- * - made fixes to allow recursive macro executions
- * (improved speed during macro execution as well)
- * 3-jan-87
- * - added $FLICKER to control flicker supression
- * - made spawn commands restricted
- * - cleaned up lots of unintentional int<->char problems
- * 4-jan-87
- * - Fixed broken pipe-command (^X-@) command under MSDOS
- * - added !IF !ELSE !ENDIF directives and changed the
- * name of !END to !ENDM....real slick stuff
- * 5-jan-87
- * - quick-exit (M-Z) aborts on any filewrite errors
- * 8-jan-87
- * - debugged a lot of the new directive and evaluation code.
- * BEWARE of stack space overflows! (increasing stack to
- * 16K under MSDOS)
- * - removed non-standard DEC Rainbow keyboard support...let someone
- * PLEASE implement this in the standard manner using key bindings
- * and send the results to me.
- * - added change-screen-width () command and $CURWIDTH variable
- * 11-jan-87
- * - fixed an incredibly deeply buried bug in vtputc and combined
- * it with vtpute (saving about 200 bytes!)
- * 16-jan-87
- * - added code to handle controlling multiple screen resolutions...
- * allowed the IBM-PC driver to force Mono or CGA modes.
- * - added current buffer name and filename variables
- * $cbufname and $cfname
- * 18-jan-87
- * - added $sres variable to control screen resolution
- * - added $debug variable to control macro debugging code (no longer
- * is this activated by GLOBAL spell mode)
- * - fixed bug in -g command line option
- * - Released Version 3.8 to BBSNET
- * 21-jan-87
- * - added $status variable to record return status of last command
- * 2-feb-87
- * - added ATARI 1040 support...runs in all three modes right now
- * - added $palette var with palette value in it
- * - undefined "register" in BIND.C and INPUT.C for ST520 & LATTICE
- * to get around a nasty Lattice bug
- * 4-feb-87
- * - added, debugged code for switching all 1040ST color modes, added
- * code for HIGH monochrome mode as well, DENSE still pending
- * 5-feb-87
- * - with John Gamble, found and corrected the infamous bad matching
- * fence problems.
- * - added error return check in various add/delete mode commands
- * 10-feb-87
- * - re-arrange code in docmd() so that labels are stored in
- * macro buffers
- * - fixed !RETURN to only return if (execlevel == 0) [If we are
- * currently executing]
- * 14-feb-87
- * - added to outp() calls in the EGA driver to fix a bug in the BIOS
- * - adding code for 1040ST 40 line DENSE mode (not complete)
- * 25-feb-87
- * - added auto-save "ASAVE" mode....variables $asave and $acount
- * control the frequency of saving and count until next save
- * - added &and and &or as functions for logical anding and oring
- * - added string length &LEN, upper and lower case string funtions
- * &LOWER and &UPPER
- * 27-feb-87
- * - added $lastkey last keystroke struck and
- * $curchar character under cursor
- * 28-feb-87
- * - added code for trim-line (^X^T) command and table entries
- * for the entab-line (^X^E) and detab-line (^X^D) commands.
- * These are conditional on AEDIT (Advanced editing) in estruct.h
- * 18-mar-87
- * - finished above three commands
- * - added $version environment variable to return the current
- * MicroEMACS version number
- * - added $discmd emvironment variable. This is a logical flag that
- * indicates if emacs should be echoing commands on the command line.
- * real useful in order to stop flashing macros and .rc files
- * - added $progname environment variable. this always returns the
- * string "MicroEMACS". OEM's should change this so that macros can
- * tell if they are running on an unmodified emacs or not.
- * - fixed a minor bug in the CGA/MONO detection routine in IBMPC.C
- * 20-mar-87
- * - integrated EGAPC.C into IBMPC.C and eliminated the file. Now an
- * EGA user can switch from EGA to CGA modes at will
- * - A LOT of little fixes and corrections sent in by John Ruply
- * 25-mar-87
- * - Fixed buffer variables so they will work when referencing the
- * current buffer
- * 26-mar-87
- * - Fixed atoi() to be more reasonable. trailing whitespace ignored,
- * only one leading sign, no non-digits allowed after the sign.
- * - fixed buffer variables to go from the point to the end of
- * line.
- * 28-mar-87
- * - fixed bugs with 8 bit chars as submited by Jari Salminen
- * - replace AZTEC/MSDOS agetc() with a1getc() which won't strip
- * the high order bit
- * 30-mar-87
- * - changed list-buffers (^X^B) so that with any argument, it will
- * also list the normally invisable buffers
- * - added store-procedure and execute-procedure/run (M-^E)
- * commands to store and execute named procedures.
- * 31-mar-87
- * - Fixed infinite loop in ^X-X command (when [LIST] is the
- * only buffer left) as pointed out by John Maline
- * - made filenames in getfile() always lower case as pointed
- * out by John Maline
- * 2-apr-87
- * - Fixed buffer variables so they would work on non-current displayed
- * buffers. They should now work with ALL buffers....
- * 3-apr-87
- * - Yanked AZTEC profiling code....not very useful
- * - Modified IBMPC driver so it will not start in EGA mode
- * - allow the next-buffer (^X-X) command to have a preceding
- * non-negative argument.
- * 14-apr-87
- * - added John Gamble's modified search.c. The code has cut apx
- * 200-300 bytes off the executable.
- * - added the &RND function to generate a random integer between
- * 1 and its arguments value. Also $SEED is availible as the
- * random number seed.
- * - changed the -k command line switch so if there is no argument,
- * it will prompt for one when the file is read
- * 15-apr-87
- * - added 20 bytes of buffer in getval()'s local argument alloc so
- * when it returns a value, it has enough stack space to do at least
- * one strcpy() before stomping on the returned value. ALWAYS call
- * getval() ONLY from within a strcpy() call.
- * - made $curcol return a 1 based value instead of a zero based one.
- * [changed this back later for 3.8o it was simply wrong.....]
- * 16-apr-87
- * - re-wrote strncpy() for AZTEC & MSDOS so it null terminates the
- * string.
- * - changed pipe() to pipecmd() to avoid conflicts with various
- * UNIX systems
- * 24-apr-87
- * - changed open parameters on AMIGA window open to 0/0/640/200
- * [Froze and released v3.8i via BBS net]
- * 14-may-87
- * - added nop (M-FNC) that gets called on every command loop
- * - added $wline, returns and sets # lines in current window
- * - added $cwline, returns and set current line within window
- * - added $target, returns/sets target for line moves
- * - added $search, returns/sets default search string
- * - added $replace, returns/sets default replace string
- * - added $match, returns last matched string in magic search
- * 29-may-87
- * - rewrote word deletes to not kill trailing non-whitespace after
- * the last word. Also a zero argument will cause it to just delete
- * the word and nothing else.
- * - more fixes for the search pattern environment variables
- * 30-may-87
- * - forced all windows to redraw on a width change
- * 2-jun-87
- * - forced clear-message-line to overide $discmd
- * - added mlforce() routine and call it in clear-message-line,
- * write-message and when $debug is TRUE
- * - recoded the startup sequence in main()....Much Better...
- * 4-jun-87
- * - forced interactive arguments ( @"question" ) to ALWAYS be echoed
- * regardless of the setting of $discmd.
- * 7-jun-87
- * - started adding support for Turbo C under MSDOS
- * 11-jun-87
- * - words now include ONLY upper/lower case alphas and digits
- * - fixed some more bugs with the startup..(ORed in the global modes)
- * - took more limits off the self-insert list....
- * 16-jun-87
- * - macro debugging now displays the name of the current macro.
- * - fixed a problem in expandp() in search.c that kept high-byte
- * characters from working in search strings
- * 18-jun-87
- * - added &sindex <str1> <str2> function which searches for string 2
- * within string 1
- * [released verion 3.8o internally]
- * 19-jun-87
- * - added $cmode and $gmode to return and set the mode of the
- * current buffer and the global mode
- * - separated findvar() out from setvar() so it could be used in
- * the !LOOP directive (which got canned....read on)
- * - %No such variable message now types the name of the offending
- * variable
- * 22-jun-87
- * - fixed startup bug when editing the startup file
- * - added the !LOOP <var> <label> directive
- * 26-jun-87
- * - dumped !LOOP......added !WHILE. This needed and caused a vaste
- * reorginization in exec.c which mainly involved moving all the
- * directive handling from docmd() to dobuf(), in the process
- * getting rid of a lot of junk and making the result smaller
- * than it started.....(yea!)
- * - added $tpause to control the fence flashing time in CMODE.
- * The value is machine dependant, but you can multiply the
- * original in macros to stay machine independant. (as
- * suggested by Baron O.A. Grey)
- * - added hook to execute M-FNR (null) during a file read, after
- * the name is set and right before the file is read. Took out
- * any auto-CMODE code, as this is now handled with a macro.
- * (also suggested by Baron O.A. Grey)
- * - Added Baron O.A. Grey's SYSTEM V typeahead() code...I hope
- * this works....if you check this out, drop me a line.
- * - Added new variable $pending, returns a logical telling if
- * a typed ahead character is pending.
- * 29-jun-87
- * - Made adjustmode() use curbp-> instead of curwp->w_bufp-> which
- * fixed some bugs in the startup routines.
- * - added $lwidth to return the length of the current line
- * 2-jul-87
- * - Added &env <str> which returns the value of the environment
- * variable <str> where possible
- * - Fixed a NASTY bug in execbuf()..the buffer for the name
- * of the buffer to execute was NBUFN long, and got overflowed
- * with a long interactive argument.
- * 3-jul-87
- * - Moved the loop to match a key against its binding out of execute()
- * to getbind() so it could be used later elsewhere.
- * - Added &bind <keyname> which returns the function bound to the
- * named key
- * - changed execute-file to look in the executable path first...
- * 6-jul-87
- * - changed $curchar to return a newline at the end of a line and
- * it no longer advances the cursor
- * - a lot of minor changes sent by various people....
- * 7-jul-87
- * - some amiga specific fixes as suggested by Kenn Barry
- * - added $line [read/write] that contains the current line in the
- * current buffer
- * - changed $curcol so setting it beyond the end of the line will
- * move the cursor to the end of the line and then fail.
- * 10-jul-87
- * - added a number of fixes and optimizations along with the rest
- * of the TURBO-C support as submited by John Maline
- * 13-jun-87
- * - caused dobuf() to copy lastflag to thisflag so the first
- * command executed will inherit the lastflag from the command
- * before the execute-buffer command. (needed this for smooth
- * scrolling to work)
- * - made flook() look first in the $HOME directory, then in the
- * current directory, then down the $PATH, and then in the
- * list in epath.h
- * 14-jul-87
- * - added some fixes for VMS along with support for the SMG
- * screen package as submited by Curtis Smith
- * 15-jul-87
- * - fixed M-^H (delete-previous-word) so it can delete the first
- * word in a file....I think there may be more of this kind of thing
- * to fix.
- * 16-jul-87
- * - added code to allow arbitrary sized lines to be read from files..
- * speed up file reading in the process.
- * - made out of memory conditions safer.. especial on file reads
- * - fixed a bug in bind having to do with uppercasing function
- * key names (submitted by Jari Salminen)
- * - made ST520 exit in the same resolution that EMACS was started in
- * (for the 1040ST)
- * [FROZE development and released version 3.9 to USENET]
- */
-
- #include <stdio.h>
-
- /* for MSDOS, increase the default stack space */
-
- #if MSDOS & LATTICE
- unsigned _stack = 32767;
- #endif
-
- #if ATARI & LATTICE & 0
- int _mneed = 256000; /* reset memory pool size */
- #endif
-
- #if MSDOS & AZTEC
- int _STKSIZ = 32767/16; /* stack size in paragraphs */
- int _STKRED = 1024; /* stack checking limit */
- int _HEAPSIZ = 4096/16; /* (in paragraphs) */
- int _STKLOW = 0; /* default is stack above heap (small only) */
- #endif
-
- #if MSDOS & TURBO
- unsigned _stklen = 32768;
- #endif
-
- /* make global definitions not external */
- #define maindef
-
- #include "estruct.h" /* global structures and defines */
- #include "efunc.h" /* function declarations and name table */
- #include "edef.h" /* global definitions */
- #include "ebind.h" /* default key bindings */
-
- #if VMS
- #include <ssdef.h>
- #define GOOD (SS$_NORMAL)
- #endif
-
- #ifndef GOOD
- #define GOOD 0
- #endif
-
- main(argc, argv)
- char *argv[];
- {
- register int c; /* command character */
- register int f; /* default flag */
- register int n; /* numeric repeat count */
- register int mflag; /* negative flag on repeat */
- register BUFFER *bp; /* temp buffer pointer */
- register int firstfile; /* first file flag */
- register int carg; /* current arg to scan */
- register int startflag; /* startup executed flag */
- BUFFER *firstbp = NULL; /* ptr to first buffer in cmd line */
- int basec; /* c stripped of meta character */
- int viewflag; /* are we starting in view mode? */
- int gotoflag; /* do we need to goto a line at start? */
- int gline; /* if so, what line? */
- int searchflag; /* Do we need to search at start? */
- int saveflag; /* temp store for lastflag */
- char bname[NBUFN]; /* buffer name of file to read */
- #if CRYPT
- int cryptflag; /* encrypting on the way in? */
- char ekey[NPAT]; /* startup encryption key */
- #endif
- char *strncpy();
- extern *pathname[]; /* startup file path/name array */
-
- /* initialize the editor */
- vtinit(); /* Display */
- edinit("main"); /* Buffers, windows */
- varinit(); /* user variables */
-
- viewflag = FALSE; /* view mode defaults off in command line */
- gotoflag = FALSE; /* set to off to begin with */
- searchflag = FALSE; /* set to off to begin with */
- firstfile = TRUE; /* no file to edit yet */
- startflag = FALSE; /* startup file not executed yet */
- #if CRYPT
- cryptflag = FALSE; /* no encryption by default */
- #endif
-
- /* Parse the command line */
- for (carg = 1; carg < argc; ++carg) {
-
- /* Process Switches */
- if (argv[carg][0] == '-') {
- switch (argv[carg][1]) {
- case 'e': /* -e for Edit file */
- case 'E':
- viewflag = FALSE;
- break;
- case 'g': /* -g for initial goto */
- case 'G':
- gotoflag = TRUE;
- gline = atoi(&argv[carg][2]);
- break;
- #if CRYPT
- case 'k': /* -k<key> for code key */
- case 'K':
- cryptflag = TRUE;
- strcpy(ekey, &argv[carg][2]);
- break;
- #endif
- case 'r': /* -r restrictive use */
- case 'R':
- restflag = TRUE;
- break;
- case 's': /* -s for initial search string */
- case 'S':
- searchflag = TRUE;
- strncpy(pat,&argv[carg][2],NPAT);
- break;
- case 'v': /* -v for View File */
- case 'V':
- viewflag = TRUE;
- break;
- default: /* unknown switch */
- /* ignore this for now */
- break;
- }
-
- } else if (argv[carg][0]== '@') {
-
- /* Process Startup macroes */
- if (startup(&argv[carg][1]) == TRUE)
- /* don't execute emacs.rc */
- startflag = TRUE;
-
- } else {
-
- /* Process an input file */
-
- /* set up a buffer for this file */
- makename(bname, argv[carg]);
- unqname(bname);
-
- /* set this to inactive */
- bp = bfind(bname, TRUE, 0);
- strcpy(bp->b_fname, argv[carg]);
- bp->b_active = FALSE;
- if (firstfile) {
- firstbp = bp;
- firstfile = FALSE;
- }
-
- /* set the modes appropriatly */
- if (viewflag)
- bp->b_mode |= MDVIEW;
- #if CRYPT
- if (cryptflag) {
- bp->b_mode |= MDCRYPT;
- crypt((char *)NULL, 0);
- crypt(ekey, strlen(ekey));
- strncpy(bp->b_key, ekey, NPAT);
- }
- #endif
- }
- }
-
- /* if invoked with no other startup files,
- run the system startup file here */
- if (startflag == FALSE) {
-
- /* if emacs.rc is one of the input files....don't clobber it */
- if (!firstfile && strcmp(pathname[0], firstbp->b_bname) == 0) {
- c = firstbp->b_bname[0];
- firstbp->b_bname[0] = '[';
- startup("");
- firstbp->b_bname[0] = c;
- } else {
- startup("");
- }
- startflag = TRUE;
- }
-
- /* if there are any files to read, read the first one! */
- bp = bfind("main", FALSE, 0);
- if (firstfile == FALSE) {
- swbuffer(firstbp);
- curbp->b_mode |= gmode;
- zotbuf(bp);
- } else
- bp->b_mode |= gmode;
-
- /* Deal with startup gotos and searches */
- if (gotoflag && searchflag) {
- update(FALSE);
- mlwrite("[Can not search and goto at the same time!]");
- }
- else if (gotoflag) {
- if (gotoline(TRUE,gline) == FALSE) {
- update(FALSE);
- mlwrite("[Bogus goto argument]");
- }
- } else if (searchflag) {
- if (forwhunt(FALSE, 0) == FALSE)
- update(FALSE);
- }
-
- /* setup to process commands */
- lastflag = 0; /* Fake last flags. */
-
- loop:
- /* execute the "command" macro...normally null */
- saveflag = lastflag; /* preserve lastflag through this */
- execute(META|SPEC|'C', FALSE, 1);
- lastflag = saveflag;
-
- /* Fix up the screen */
- update(FALSE);
-
- /* get the next command from the keyboard */
- c = getcmd();
-
- /* if there is something on the command line, clear it */
- if (mpresf != FALSE) {
- mlerase();
- update(FALSE);
- #if CLRMSG
- if (c == ' ') /* ITS EMACS does this */
- goto loop;
- #endif
- }
- f = FALSE;
- n = 1;
-
- /* do META-# processing if needed */
-
- basec = c & ~META; /* strip meta char off if there */
- if ((c & META) && ((basec >= '0' && basec <= '9') || basec == '-')) {
- f = TRUE; /* there is a # arg */
- n = 0; /* start with a zero default */
- mflag = 1; /* current minus flag */
- c = basec; /* strip the META */
- while ((c >= '0' && c <= '9') || (c == '-')) {
- if (c == '-') {
- /* already hit a minus or digit? */
- if ((mflag == -1) || (n != 0))
- break;
- mflag = -1;
- } else {
- n = n * 10 + (c - '0');
- }
- if ((n == 0) && (mflag == -1)) /* lonely - */
- mlwrite("Arg:");
- else
- mlwrite("Arg: %d",n * mflag);
-
- c = getcmd(); /* get the next key */
- }
- n = n * mflag; /* figure in the sign */
- }
-
- /* do ^U repeat argument processing */
-
- if (c == reptc) { /* ^U, start argument */
- f = TRUE;
- n = 4; /* with argument of 4 */
- mflag = 0; /* that can be discarded. */
- mlwrite("Arg: 4");
- while ((c=getcmd()) >='0' && c<='9' || c==reptc || c=='-'){
- if (c == reptc)
- if ((n > 0) == ((n*4) > 0))
- n = n*4;
- else
- n = 1;
- /*
- * If dash, and start of argument string, set arg.
- * to -1. Otherwise, insert it.
- */
- else if (c == '-') {
- if (mflag)
- break;
- n = 0;
- mflag = -1;
- }
- /*
- * If first digit entered, replace previous argument
- * with digit and set sign. Otherwise, append to arg.
- */
- else {
- if (!mflag) {
- n = 0;
- mflag = 1;
- }
- n = 10*n + c - '0';
- }
- mlwrite("Arg: %d", (mflag >=0) ? n : (n ? -n : -1));
- }
- /*
- * Make arguments preceded by a minus sign negative and change
- * the special argument "^U -" to an effective "^U -1".
- */
- if (mflag == -1) {
- if (n == 0)
- n++;
- n = -n;
- }
- }
-
- /* and execute the command */
- execute(c, f, n);
- goto loop;
- }
-
- /*
- * Initialize all of the buffers and windows. The buffer name is passed down
- * as an argument, because the main routine may have been told to read in a
- * file by default, and we want the buffer name to be right.
- */
- edinit(bname)
- char bname[];
- {
- register BUFFER *bp;
- register WINDOW *wp;
- char *malloc();
-
- bp = bfind(bname, TRUE, 0); /* First buffer */
- blistp = bfind("[List]", TRUE, BFINVS); /* Buffer list buffer */
- wp = (WINDOW *) malloc(sizeof(WINDOW)); /* First window */
- if (bp==NULL || wp==NULL || blistp==NULL)
- exit(1);
- curbp = bp; /* Make this current */
- wheadp = wp;
- curwp = wp;
- wp->w_wndp = NULL; /* Initialize window */
- wp->w_bufp = bp;
- bp->b_nwnd = 1; /* Displayed. */
- wp->w_linep = bp->b_linep;
- wp->w_dotp = bp->b_linep;
- wp->w_doto = 0;
- wp->w_markp = NULL;
- wp->w_marko = 0;
- wp->w_toprow = 0;
- #if COLOR
- /* initalize colors to global defaults */
- wp->w_fcolor = gfcolor;
- wp->w_bcolor = gbcolor;
- #endif
- wp->w_ntrows = term.t_nrow-1; /* "-1" for mode line. */
- wp->w_force = 0;
- wp->w_flag = WFMODE|WFHARD; /* Full. */
- }
-
- /*
- * This is the general command execution routine. It handles the fake binding
- * of all the keys to "self-insert". It also clears out the "thisflag" word,
- * and arranges to move it to the "lastflag", so that the next command can
- * look at it. Return the status of command.
- */
- execute(c, f, n)
- {
- register int status;
- int (*execfunc)(); /* ptr to function to execute */
- int (*getbind())();
-
- /* if the keystroke is a bound function...do it */
- execfunc = getbind(c);
- if (execfunc != NULL) {
- thisflag = 0;
- status = (*execfunc)(f, n);
- lastflag = thisflag;
- return (status);
- }
-
- /*
- * If a space was typed, fill column is defined, the argument is non-
- * negative, wrap mode is enabled, and we are now past fill column,
- * and we are not read-only, perform word wrap.
- */
- if (c == ' ' && (curwp->w_bufp->b_mode & MDWRAP) && fillcol > 0 &&
- n >= 0 && getccol(FALSE) > fillcol &&
- (curwp->w_bufp->b_mode & MDVIEW) == FALSE)
- execute(META|SPEC|'W', FALSE, 1);
-
- if ((c>=0x20 && c<=0xFF)) { /* Self inserting. */
- if (n <= 0) { /* Fenceposts. */
- lastflag = 0;
- return (n<0 ? FALSE : TRUE);
- }
- thisflag = 0; /* For the future. */
-
- /* if we are in overwrite mode, not at eol,
- and next char is not a tab or we are at a tab stop,
- delete a char forword */
- if (curwp->w_bufp->b_mode & MDOVER &&
- curwp->w_doto < curwp->w_dotp->l_used &&
- (lgetc(curwp->w_dotp, curwp->w_doto) != '\t' ||
- (curwp->w_doto) % 8 == 7))
- ldelete(1L, FALSE);
-
- /* do the appropriate insertion */
- if (c == '}' && (curbp->b_mode & MDCMOD) != 0)
- status = insbrace(n, c);
- else if (c == '#' && (curbp->b_mode & MDCMOD) != 0)
- status = inspound();
- else
- status = linsert(n, c);
-
- #if CFENCE
- /* check for CMODE fence matching */
- if ((c == '}' || c == ')' || c == ']') &&
- (curbp->b_mode & MDCMOD) != 0)
- fmatch(c);
- #endif
-
- /* check auto-save mode */
- if (curbp->b_mode & MDASAVE)
- if (--gacount == 0) {
- /* and save the file if needed */
- upscreen(FALSE, 0);
- filesave(FALSE, 0);
- gacount = gasave;
- }
-
- lastflag = thisflag;
- return (status);
- }
- TTbeep();
- mlwrite("[Key not bound]"); /* complain */
- lastflag = 0; /* Fake last flags. */
- return (FALSE);
- }
-
- /*
- * Fancy quit command, as implemented by Norm. If the any buffer has
- * changed do a write on that buffer and exit emacs, otherwise simply exit.
- */
- quickexit(f, n)
- {
- register BUFFER *bp; /* scanning pointer to buffers */
- register BUFFER *oldcb; /* original current buffer */
- register int status;
-
- oldcb = curbp; /* save in case we fail */
-
- bp = bheadp;
- while (bp != NULL) {
- if ((bp->b_flag&BFCHG) != 0 /* Changed. */
- && (bp->b_flag&BFINVS) == 0) { /* Real. */
- curbp = bp; /* make that buffer cur */
- mlwrite("[Saving %s]",bp->b_fname);
- mlwrite("\n");
- if ((status = filesave(f, n)) != TRUE) {
- curbp = oldcb; /* restore curbp */
- return(status);
- }
- }
- bp = bp->b_bufp; /* on to the next buffer */
- }
- quit(f, n); /* conditionally quit */
- return(TRUE);
- }
-
- /*
- * Quit command. If an argument, always quit. Otherwise confirm if a buffer
- * has been changed and not written out. Normally bound to "C-X C-C".
- */
- quit(f, n)
- {
- register int s;
-
- if (f != FALSE /* Argument forces it. */
- || anycb() == FALSE /* All buffers clean. */
- /* User says it's OK. */
- || (s=mlyesno("Modified buffers exist. Leave anyway")) == TRUE) {
- #if FILOCK
- if (lockrel() != TRUE) {
- TTputc('\n');
- TTputc('\r');
- TTclose();
- TTkclose();
- exit(1);
- }
- #endif
- vttidy();
- exit(GOOD);
- }
- mlwrite("");
- return (s);
- }
-
- /*
- * Begin a keyboard macro.
- * Error if not at the top level in keyboard processing. Set up variables and
- * return.
- */
- ctlxlp(f, n)
- {
- if (kbdmode != STOP) {
- mlwrite("%%Macro already active");
- return(FALSE);
- }
- mlwrite("[Start macro]");
- kbdptr = &kbdm[0];
- kbdend = kbdptr;
- kbdmode = RECORD;
- return (TRUE);
- }
-
- /*
- * End keyboard macro. Check for the same limit conditions as the above
- * routine. Set up the variables and return to the caller.
- */
- ctlxrp(f, n)
- {
- if (kbdmode == STOP) {
- mlwrite("%%Macro not active");
- return(FALSE);
- }
- if (kbdmode == RECORD) {
- mlwrite("[End macro]");
- kbdmode = STOP;
- }
- return(TRUE);
- }
-
- /*
- * Execute a macro.
- * The command argument is the number of times to loop. Quit as soon as a
- * command gets an error. Return TRUE if all ok, else FALSE.
- */
- ctlxe(f, n)
- {
- if (kbdmode != STOP) {
- mlwrite("%%Macro already active");
- return(FALSE);
- }
- if (n <= 0)
- return (TRUE);
- kbdrep = n; /* remember how many times to execute */
- kbdmode = PLAY; /* start us in play mode */
- kbdptr = &kbdm[0]; /* at the beginning */
- return(TRUE);
- }
-
- /*
- * Abort.
- * Beep the beeper. Kill off any keyboard macro, etc., that is in progress.
- * Sometimes called as a routine, to do general aborting of stuff.
- */
- ctrlg(f, n)
- {
- TTbeep();
- kbdmode = STOP;
- mlwrite("[Aborted]");
- return(ABORT);
- }
-
- /* tell the user that this command is illegal while we are in
- VIEW (read-only) mode */
-
- rdonly()
-
- {
- TTbeep();
- mlwrite("[Key illegal in VIEW mode]");
- return(FALSE);
- }
-
- resterr()
-
- {
- TTbeep();
- mlwrite("[That command is RESTRICTED]");
- return(FALSE);
- }
-
- nullproc() /* user function that does NOTHING */
-
- {
- }
-
- meta() /* dummy function for binding to meta prefix */
- {
- }
-
- cex() /* dummy function for binding to control-x prefix */
- {
- }
-
- unarg() /* dummy function for binding to universal-argument */
- {
- }
-
- /***** Compiler specific Library functions ****/
-
- #if MWC86 & MSDOS
- movmem(source, dest, size)
-
- char *source; /* mem location to move memory from */
- char *dest; /* memory location to move text to */
- int size; /* number of bytes to move */
-
- {
- register int i;
-
- for (i=0; i < size; i++)
- *dest++ = *source++;
- }
- #endif
-
- #if (AZTEC | MSC | TURBO | LATTICE) & MSDOS
- /* strncpy: copy a string...with length restrictions
- ALWAYS null terminate
- */
-
- char *strncpy(dst, src, maxlen)
-
- char *dst; /* destination of copied string */
- char *src; /* source */
- int maxlen; /* maximum length */
-
- {
- char *dptr; /* ptr into dst */
-
- dptr = dst;
- while (*src && (maxlen-- > 0))
- *dptr++ = *src++;
- *dptr = 0;
- return(dst);
- }
- #endif
-
- #if RAMSIZE & LATTICE & MSDOS
- /* These routines will allow me to track memory usage by placing
- a layer on top of the standard system malloc() and free() calls.
- with this code defined, the environment variable, $RAM, will
- report on the number of bytes allocated via malloc.
-
- with SHOWRAM defined, the number is also posted on the
- end of the bottom mode line and is updated whenever it is changed.
- */
-
- #undef malloc
- #undef free
-
- char *allocate(nbytes) /* allocate nbytes and track */
-
- unsigned nbytes; /* # of bytes to allocate */
-
- {
- char *mp; /* ptr returned from malloc */
- char *malloc();
-
- mp = malloc(nbytes);
- if (mp) {
- envram += nbytes;
- #if RAMSHOW
- dspram();
- #endif
- }
-
- return(mp);
- }
-
- release(mp) /* release malloced memory and track */
-
- char *mp; /* chunk of RAM to release */
-
- {
- unsigned *lp; /* ptr to the long containing the block size */
-
- if (mp) {
- lp = ((unsigned *)mp) - 1;
-
- /* update amount of ram currently malloced */
- envram -= (long)*lp - 2;
- free(mp);
- #if RAMSHOW
- dspram();
- #endif
- }
- }
-
- #if RAMSHOW
- dspram() /* display the amount of RAM currently malloced */
-
- {
- char mbuf[20];
- char *sp;
-
- TTmove(term.t_nrow - 1, 70);
- #if COLOR
- TTforg(7);
- TTbacg(0);
- #endif
- sprintf(mbuf, "[%lu]", envram);
- sp = &mbuf[0];
- while (*sp)
- TTputc(*sp++);
- TTmove(term.t_nrow, 0);
- movecursor(term.t_nrow, 0);
- }
- #endif
- #endif
-