World of Shareware - Software Farm 2/wosw_2.zip/wosw_2/CPROG/BOSS_SUP.ZIP/REV.HST

Text File | 1992-03-05 | 38KB | 808 lines

/*
** WINDOWS - Simple but Elegant Window Functions
**           (Datalight, Lattice, CI86, Microsoft, Borland
**            Zortech, Mix PowerC, Manx AZTEC C, WATCOM)
**
** Copyright (c) 1984 - 1991 - Philip A. Mongelluzzo
** All rights reserved.
**
** Revision History in reverse order:
**
**  The following changes were incorporated in the 03/15/92 release:
**
**              Added wns_gfrm2 to workaround problems Topspeed C had
**              in compiling wn_frmget.
**              (wn_frmget.c)                           (V7.02)
**
**              Added pulldown functions.  This is actually a replacement
**              for wn_popup but adding it in this way will protect
**              existing users software investment.
**              (wn_pdown.c)                            (V7.01)
**
**              Certified Borland C++ 3.0 and TC++ for Windows
**              (no code changes)                       (V7.00)
**
**              Certified Microsoft Quick C for Windows.
**              (no code changes)                       (V6.16)
**
**              wn_frmget was not BACK TABBING over display text.
**              Thanks to Rick Brown for reporting the problem and
**              the fix.
**              (wn_frmget.c)                           (V6.15)
**
**        wn_getca was calling wns_err with an incorrect parameter.
**        (wn_puts.c)                (V6.14)
**
**  The following changes were incorporated in the 10/31/91 release:
**
**              Certified WATCOM 8.5, MIX Power C 2.10
**              Borland TC++ 1.01, Borland TC 2.01, Borland C 2.0
**
**              Dropped formal support of CI86, Datalight,
**              Aztec, and Watcom's EXPRESS C.
**              DO NOT CONFUSE EXPRESS C WITH WATCOM'S OPTIMIZING
**              C COMPILER.
**
**              Added wn_getca (get char and atrib from window).
**              (wn_puts)                               (V6.13)
**
**              Added wn_gmltext (get multiline text)
**              (wn_gtext, winboss.h)                   (V6.12)
**
**              Taught wn_input about ^RightArrow and ^LeftArrow.
**              AKA word right and word left.  Ground work for
**              wn_gtxbuf (get text buffer).
**              (wn_input, winboss.h)                   (V6.11)
**
**              Added wn_gssn - get social security number
**              (wn_gssn, wn_frmget, winboss.h)         (V6.10)
**
**              Added wn_clreol - Clear to end of line
**              Added wn_clreow - Clear to end of window
**              (wn_clrfns)                             (V6.09)
**
**              Added wn_gedate - get European date.
**              (winboss.h, wn_frmget, wn_gedate)       (V6.08)
**
**              v_setatr & v_setrev are no longer macros, they are
**              now functions.
**              (winboss.h, wn_bios)                    (V6.07)
**
**              New shadow window type 510 which provides transparrent
**              shadow (dimly lit characters). NOTE: windows with
**              transparrent shadows can be moved freely, however,
**              once they have been covered by another window and
**              are moved the shadow area will loose sync with
**              the underlying text.  This is not a bug it is a
**              restriction.
**              (wn_open, wn_move, wn_activ)            (V6.06)
**
**              Added v_gctype - get cursor type.  Ya all asked for it
**              so ya all got it.
**              (wn_bios)                               (V6.05)
**
**              wn_popup was not handling BACKSPACE correctly. Thanks
**              to Harold Jackson for reporting the problem.
**              (wn_popup.c, winboss.h)                 (V6.04)
**
**              WN_SBIT's definition changed in TCVLIB.ASM
**              (tcvlib.asm)                            (V6.03)
**
**              "windows.h"   renamed to "winboss.h"
**              "windows.ext" renamed to "winboss.ext"
**              "windows.fns" renamed to "winboss.fns"
**              These changes were made to eliminate the pontential
**              conflict between Borland C++ (2.X) and The Window BOSS.
**              (various)                               (V6.02)
**
**  The following changes were incorporated in the 01/07/91 release:
**
**  12.26.90 -  wn_hlinit was allocating more memory than was needed.
**              (wn_help.c)                             (V6.01)
**
**              TopSpeed "C" support added.
**              (windows.h, windows.fnt)
**
**              wn_gulong was short 1 byte on the mask it passes
**              to wn_input.c.  Thanks to the TopSpeed Compiler for
**              finding this.
**
**              Moved v_getchm() to "wn_mouse.c" to eliminate including
**              ANY mouse code from applications that do not call
**              any of the mouse functions.  v_getchm() was previously
**              located in "wn_bios.c".
**
**              Microsoft 6.00A certification.
**
**  12.14.90 -  wn_close was not setting wn->shadow to FALSE when
**              closing shadowed windows.  This was causing wn_activate
**              to do potentially foolish things.       (V6.00)
**
**  (11.01.90)  ** [Limited distribution release]
**
**  09.14.90 -  Watcom 8.0 Support                      (V5.22)
**
**  08.25.90 -  Added v_getchm() - get character or mouse press.
**              (wn_mouse, wn_bios, windows.c,
**              windows.ext)                            (V5.21)
**
**  07.25.90 -  Zortech 2.10 Support.                   (V5.20)
**
**  07.23.90 -  Mix Power C 2.00 Support.               (V5.19)
**
**  07.18.90 -  Turbo C++ Support.  Created TCVLIB.ASM to get around
**              Borland's oversight with regard to "CONST".
**              (wn_print.c, tcvlib.asm)                (V5.18)
**
**  The following changes were incorporated in the 07.01.90 release:
**
**  06.16.90 -  Cosmetic and misc changes: (BOSSDEMO.C,
**              MAKELIB.BAT (LC6), include memory model directives
**              for Lattice 6.XX batch files).
**              Thanks again to Bill Hinkle.            (V5.17)
**
**              QuickC 2.5 Support.
**
**              MSC 6.0 Support.  Changed "windows.h" to CAST
**              NULL as an int.
**              (windows.h)
**
**  04.04.90 -  wn_help was taught to use wn_putsa to enforce user
**              specified help screen attributes.  Tip of the hat
**              to Chris Madsen.
**              (wn_help.c)                             (V5.16)
**
**  03.23.90 -  Added "wns_escape". This is set to TRUE by wn_input
**              whenever ESCAPE has terimated the input.  ESCAPE
**              now terminates input for all input field types.
**              (wn_gbool, wn_gdate, wn_double, wn_gfloat, wn_gphone)
**              (wn_gtime, wn_guint, wn_gulong, wn_gint)
**              Thanks Dexter!!                         (V5.15)
**
**  03.12.90 -  Due to popular request, wn_open now range checks
**              the window parameters to make sure that the window
**              will actually fit on the screen.  NULL is returned
**              if not.  This will prevent some cockpit "bad handle"
**              error exits.
**              (wn_open.c)                             (V5.14)
**
**  03.08.90 -  Added wn_hlinit, wn_help, wn_popup, and wn_qpopup.
**              These functions are close clones to the old sample
**              code provided in help.c and popup.c.  HELP.C and
**              POPUP.C will no longer be distributed.
**              (wn_help.c, wn_popup.c, windows.h)
**              (genindex.c)                            (V5.13)
**
**  03.07.90 -  Placed all "externals" in "windows.ext".  This is
**              being done to ease the burden of making changes
**              to both global and external data.  This will also
**              keep all the constants in one place.
**              (windows.c, windows.h, windows.ext)     (V5.12)
**
**  03.06.90 -  HELP Key is now user definable.  The global wns_hkey
**              has been added and defaults to F1.  This global
**              can be set directly of via the wn_shkey() function.
**              (windows.c, wn_init.c)                  (V5.11)
**
**  03.04.90 -  Added wn_stitle (Supertitle).  wn_stitle provides
**              (top, bottom) (centered, left, right) titles!
**              wn_stitle.c                             (V5.10)
**
**  03.03.90 -  Added wn_gatext - get ascii (ANY ascii text).
**              Now you can input graphics characters!
**              Tnx to Werner Schonber for the suggestion.
**              wn_gtext.c                              (V5.09)
**
**  03.01.90 -  Fine tuned overlap detection to improve performance.
**              wn_activ.c                              (V5.08)
**
**  02.25.90 -  Shadow window support. wn_activ.c, wn_close.c,
**              wn_move.c, windows.h, windows.c, wn_open.c
**                                                      (V5.07)
**
**  02.24.90 -  Eliminated most of the assembler functions.  This
**              was done to provide better support for the HUGE
**              memory model.
**              (c:{wn_bios, wn_mouse, wn_sup}, *.asm)  (V5.06)
**
**  02.04.90 -  Linked exploding windows to time of day clock.
**              Added wns_gticks() in wn_open.c.
**              nap() in BOSSDEMO now uses wns_gticks.
**              (wn_open.c)                             (V5.05)
**
**  02.03.90 -  wn_sdelspc was not handling requests to delete
**              trailing and leading spaces from strings that were
**              only spaces!  Tnx es a tip-o-de-hat to Pat Elam,
**              M. G. F. Gilliland, M.D., and Harold Jackson.
**              (wn_string.c)                           (V5.04)
**
**  01.28.90 -  wns_movscr was not allowing for 132 column or
**              wider screens.  It was taught how to allocate memory
**              for user defined physical screen sizes.  Thanks to the
**              folks at Atomic Energy of Canada LTD.
**              (wn_sup.c)                              (V5.03)
**
**           -  v_cls() in "wn_bios" was taught about wni_mxrows
**              and wni_mxcols.
**              (wn_bios.c)                             (V5.02)
**
**  01.20.90 -  Pulldown code in BOSSDEMO would not work if called
**              twice.  The problem was traced to the "winopn" member
**              of the static structure mainbar.  Setting "mainbar.winopn"
**              to FALSE before "wn_close(mainbar.wpsave)" in "pddemo()"
**              solves the potential problem.  Thanks to Russ Brown for
**              reporting the problem.
**              (bossdemo.c)                            (V5.01)
**
**              Version conversion table:
**
**                   Base Release    Base Version
**                      ??.??.86        1.00
**                      ??.??.87        2.00
**                      ??.??.88        3.00
**                      ??.??.89        4.00
**                      ??.??.90        5.00
**
**  The following changes were incorporated in the 02.15.90 release:
**                         AKA Version 5.00
**
**  01.10.90 -  WCVLIB.ASM created.  This file contains the assembly
**              language routines for WATCOM 7.0.  Previous versions of
**              WATCOM should use MSVLIB.ASM.
**
**  01.05.89 -  Physical windows wider than 80 columns were not
**              working correctly.  Thanks to all who reported this
**              problem. (wn_actic.c, wn_sup.c, windows.c, wn_init.c).
**              The constant "4096" was not removed in wn_savres. It
**              does not impact the physical sceen size logic but does
**              allow the code of those who have "tinkered" with video
**              pages to continue to work.
**
**  12.22.89 -  Re-assembled all assembly language routines to insure
**              that wni_mxcols, wni_mxrows, and wni_mxneed were being
**              used correctly.
**
**  11.30.89 -  ZORTECH 2.0 Support.  Please note that ZORLIB version
**              2.0 can not create a usable LWIN.LIB.  Microsoft's LIB
**              works fine and should be used.  ZORTECH has been notified
**              of the problem.
**
**  11.24.89 -  jeesh... One line exploding windows exploded again!
**              This time we got the gremlin!! Tnx to Michael Canfield
**              for suppling the test case.
**
**  (11.15.89)  ** [Limited distribution release]
**
**  10.28.89 -  Modified wn_title to insure ALL compiliers process
**              hex values that are imbedded into the title properly.
**              (e.g. "Hello \xcd There!")
**              Thanks to Don Wahl for pointing out the discrepancy.
**
**  10.25.89 -  It would appear that the PC/PC_CLONE BIOS can not deal
**              with scrolling single line windows.  wn_insrow() was taught
**              to erase single line windows and avoid using the
**              BIOS for this special case.  This problem does not exist
**              on AT or PC/2 class machines.  Thanks to Harold Jackson
**              for reporting the problem.
**
**  10.24.89 -  Eliminated a potential multiple cursor problem with
**              the mouse cursor when a window is being saved/restored
**              with an active mouse.  Tip of the hat to Steve Thatcher
**              of Attachmate.
**
**  10.20.89 -  Corrected a bug in wn_open to allow 1 line exploding
**              windows to function properly.  Thanks to John F. La Fleur
**              for reporting the problem.
**
**              wn_puts was not handling borderless windows properly.
**              Thanks to Tim Keane for reporting the problem.
**
**              Lattice Version 6.0 Support
**
**  09.27.89 -  Logic was added to wn_input to insure that user supplied
**              non null editing buffers are the same lenth as their masks!
**              This logic will prevent garbage from appearing when
**              wn_input is called to peform data entry with a prefilled
**              value in the user buffer (ubuff).
**
**  09.05.89 -  The forms package now treats the ESCcape
**              like most common applications do.  That is to say that it
**              causes the current operation to cease.  Current
**              Window BOSS users please note that this feature can
**              be disabled by removing the code in wn_frmget that contains
**              "ESC.001" as part of the comments.
**
**  09.05.89 -  Added 1st character sensitivity to the sample popup menu
**              code. ** NOTE ** -> For menu's that have different 1st
**              character picks.
**
**  (08.25.89)  ** [Limited distribution release]
**
**  08.23.89 -  Exploding window opens were failing on SOME
**              adapters.  Even size exploding windows were
**              failing. Corrected!
**              Thanks to Richard Allen for his assistance.
**
**  The following changes were incorporated in the 07.01.89 release:
**
**  06.17.89 -  Lattice 3.41!! ... The version release race is on!
**
**  05.29.89 -  Mix Power C 1.30 Support.
**
**  05.25.89 -  Added wn_gutext and wn_gltext.  Get upper case only
**              and lower case only text functions.  Thanks to
**              Charlie Munao for the suggestion.  Improved code 6/6/89.
**
**  05.23.89 -  wn_frmcls now sets the form pointer to the form being
**              closed to NFRM and the individual field pointers to
**              NFLD. This should help those who attempt to dectect
**              if a form/field is active.
**
**  05.10.89 -  wn_close now sets the window pointer to the window
**              being closed to WNLPTR.  This should help those who
**              attempt to detect if a window is open.
**
**           -  Moved definition of FAR MEMORY marcos from "wn_sup.c"
**              and "wn_activ.c" to "windows.h".
**
**  05.06.89 -  By popular request... WN_FRMGET now displays both the
**              field prompt and data entry mask for all fields prior
**              to accepting input for the 1st field.  Accomplished by
**              introducing "wni_frmflg" which is used/tested by
**              all the data entry functions, wn_input, and wn_frmget.
**
**  05.05.89 -  Exploding window logic was tweeked to provide smoother
**              explosions.
**
**  05.04.89 -  Incorporated support for user defined PHYSICAL screen
**              size.  New globals: wni_mxrows, wni_mxcols, wni_mxneed.
**              Globals are defined in "windows.c" and are referenced in
**              "windows.h".  The globals are max rows, max cols, and max
**              memory required to save a *complete* screen image (rows *
**              col * 2).  A new version of wn_init, wn_psinit has be
**              provided to properly set the globals.  Refer to the manual
**              for a complete discussion.  The defaults are 25, 80, and
**              4000.  Usefull for applications and/or systems that run
**              in 43 line EGA or 50 line VGA mode.  Since The BOSS
**              assumes the screen size to be fixed, wn_psinit must be
**              called before ANY windows are opened.
**
**  04.30.89 -  v_kstat now returns TRUE rather than (-1). This conforms
**              to the constant in "windows.h".  Thanks to Clive Basson
**              at Infostat!
**
**           -  wns_dput (internal routine) was modified to call
**              wns_savres for all writes.  This will improve
**              normal screen output (speed) in most cases.
**
**           -  wns_drow (internal routine) now calls wns_savres
**              for all writes. This will improve normal screen
**              output (speed) in most cases.
**
**           -  wn_title now calls wn_dput to write title for
**              faster title writes.
**
**  04.15.89 -  wn_gulong corrected to use common "%lu" .vs. "%U"
**
**  04.05.89 -  Watcom 7.0 Support.  Tip of the hat to the folks at
**              the Watcom Compiler factory... Once again, they proved
**              that you can release a MAJOR upgrade without breaking
**              anybody's hard work (code).
**
**  04.04.89 -  Lattice 3.4X support. (LC3) Tip of the hat to
**              William Hinkle & Jon Martin (UNISYS) for thier comments,
**              suggestions and support.
**
**           -  Float/Double promotion & demotion caused wn_gfloat
**              trouble.  Resolved with #if LC3 in wn_gfloat. (LC3)
**
**           -  windows.h was modified to eliminate warnings
**              about undefined control blocks and include
**              stdlib.h for proper memory allocation
**              prototypes. (LC3)
**
**           -  Fixed LCP.BAT, APMODEL.BAT, and ADMODE.BAT (LC3)
**
**           -  Eliminated *true* unreferenced variables. (LC3)
**
**  03.11.89 -  Quick C Version 2.0 support.
**
**  03.10.89 -  wn_frmopn/cls was tweeked to be a bit smarter about
**              memory allocation & deallocation.  Tip of the hat
**              to Barry Roomberg & Peter Spreadborough.  This
**              solves the *very* random "NULL POINTER" message
**              on exit.
**
**  The following changes were incorporated in the 02.01.89 release:
**
**  02.01.89 -  Mouse support, get double, get unsigned long,
**              get password, left justify string, right justify string
**              center string, delete leading and/or trailing blanks.
**              Files: wn_mouse.c, wn_string.c, wn_gpword.c
**              Files: wn_gdouble.c, wn_gulong.c
**
**  12.26.88 -  wn_restore was modified to allow for those who like to
**              diddle with a "wn_save"d screen image.  This also
**              corrected a potential problem with restoring saved
**              images.  Thanks to Mike Blaszczak for reporting the
**              conflict.
**
**  08.01.88 -  added #if __TURBOC__ to windows.c
**
**  The following changes were incorporated in the 08.15.88 release:
**
**  07.24.88 -  wn_puts() was not fixing up color attributes on mono
**              systems - corrected.
**
**  07.10.88 -  AZTEC "C" support.  Thanks to Dexter McCloud for his
**              assistance.
**
**           -  help() has been modified to be compatiable with
**              AZTEC.  Please take note as format of the ".hlp" file
**              has changed. Refer to Intelc.hlp for examples.
**
**  07.03.88 -  WATCOM "C" support.
**
**           -  smartened up wn_frmopn() & wn_frmcls() to avoid
**              possible NULL Pointer Assignments.
**
**           -  cleaned up pointer conversion warnings in wn_activate,
**              wn_close, wn_open, wn_restore, wn_save. defined
**              WNLPTR in windows.h.
**
**           -  eliminated various warning messages during compilation,
**              Lattice still complains for no valid reason on a few
**              modules.
**
**           -  wns_alloc now use runtime routines allocating memory
**              in the large model, dos routines in small code models.
**
**           -  wns_alloc allocates and immediately frees all available
**              memory in the small data memory models before allocating far
**              memory. This eliminates memory mgmt clashes for some
**              compilers.
**
**           -  eliminated the need for "peek.c"
**
**  06.29.88 -  Corrected wn_activate to always fixup the cursor
**              display for the activated window.  Thanks to
**              John P. Toscano for reporting the problem.
**
**  06.12.88 -  Functions in wn_activate & wn_sup that call _vidblt
**              and xferdata were taught how to deal with variable
**              offsets from wns_alloc.
**
**  The following changes were incorporated in the 06.01.88 release:
**
**  06.01.88 -  Incoporated data entry routines!
**
**              Smartened up wn_puts on border detection.
**
**  05.14.88 -  Added: wn_putc  (window put character)
**                     wn_putca (window put character & attribute)
**              Both can be found in the WN_PUTS.C file.
**
**  05.10.88 -  wn_dmode was now properly sets PAINT & FLASH modes for
**              EGA video adapters - Thanks to Mike Gross from
**              West Germany
**
**  The following changes were incorporated in the 05.06.88 release:
**
**  05.06.88  - Support for MIX Power C added. - Tip of the hat to
**              Bob Lewis for his assistance.
**
**  04.27.88  - The declaration of _stklen was removed from BOSSDEMO.C,
**              this will keep Turbo C happy.
**
**  03.22.88  - wn_activate ability to detect window overlap and
**              handle borderless windows was improved.
**
**  03.22.88  - popup was taught how to handle text on the 0th line.
**
**  03.19.88  - v_spage was loading BH instead of AL. Thanks to
**              Ross Schaach (TRAX, Corp.)
**
**  02.10.88  - wn_gets was modified to insure that charcters being
**              echoed stay within the window borders.  Thanks to
**              Dave McCracken for the suggestion.
**
**  01.14.88  - static declarations of filbuf and showpage were removed
**              in help.c
**
**  The following changes were incorporated in the 11.20.87 release:
**
**  11.13.87  - Microsoft Ver 5.0 & Quick C Support
**
**  09.21.87 - wn_activate was occasionally incorrectly determining
**             window overlap.  Thanks to the folks at Datalight
**             and Marden Marshall for reporting the problem and supplying
**             test cases.
**
**  09.17.87 - wn_init() and wn_exit() were modified to work around
**             Turbo C's inability to handing allocating far memory
**             in the large model.
**
**  09.07.87 - wns_push(), wns_pop(), wn_activate(), wn_move(),
**             wns_image(), and wns_blt() were modified to use a table
**             of global segments, offsets, and pointers.
**             This was done to support the wn_init() and wn_exit()
**             functions.
**
**             wn_init() and wn_exit() added.  wn_init() must be the
**             first window fucntion called and it must only be called
**             once.  It works in conjucntion with wn_exit() to insure
**             that the screen image on application entry is restored
**             to the "T" on application exit.  wn_exit() must be the
**             last window function called.  One can not be used without
**             the other.  Both should be used but are neither are
**             required.
**
**  09.05.87 - wn_delrow was calling v_locate with args reversed
**             causing the wrong section of the screen to be cleared
**             on single line borderless windows.  Thanks to Paul
**             Stephenson of Rockwell International for reporting both
**             the problem and the cure.
**
**  09.03.87 - All assembler routines in DLVLIB.ASM now save/restore
**             the SI & DI registers.  Datalight 3.10 and later
**             specific. The -w and -p command line parameters must
**             be used when compiling The Window BOSS source code
**             under Datalight 3.10 and later.
**
**  The following changes were incorporated in the 08.22.87 release:
**
**  08.10.87 - Added wns_dmode() to set the display mode.
**             wns_dmode(PAINT) sets the window display mode to paint
**             style, wn_dmode(FLASH) sets the display mode to
**             flash style.  This function eliminates the need to set
**             wn_sbit and wns_mtflg to produce the desired effects.
**
**  07.17.87 - wn_puts() & wn_putsa() perform simple range checking to
**             insure that the string being displayed is/stays within
**             the target window.
**
**  06.22.87 - Let's "C" specific code removed. Support will continue
**             for previous versions but Mark William's products will
**             not be supported in this or future releases.  This
**             action is being as the result of compiler limitations.
**
**  06.17.87 - wn_activate now does INSTANT screen updates. Ditto
**             for wn_move.  wn_mtype() returns 1 for EGA.
**             BLAZING screen updates on EGAs.
**
**  06.07.87 - wns_wtext() was incorrectely computing the offset for
**             windows with wn_wrap enabled!
**
**  The following changes were incorporated in the 06.04.87 release:
**
**  06.03.87  - Support for BORLAND Turbo C!!
**
**  The following changes were incorporated in the 05.12.87 release:
**
**  05.12.87  - wns_text was incorrectly compensating for single line
**              borderless windows (Attachmate follow up).
**
**  05.04.87  - EXPLODING windows are now supported!! Simply add 800 to
**              the video page when calling wn_open()!
**
**            - Calls of the form wn_insrow(wn,0) and wn_delrow(wn,0)
**              caused the border to be klobbered.  wn_insrow() and
**              wn_delrow() were taught about borders.
**
**  03.31.87  - wn_printf [wns_wtext()] was incorrectly displaying graphics
**              characters. Thanks to Mark MacGee for reporting the problem.
**
**  03.23.87  - Attachmate reported that wn_gets was doing funny things
**              on single line bordered windows on PCs and PC clones but
**              was fine on ATs and AT clones!  It would appear that the
**              PC/PC_CLONE BIOS can not deal with scrolling single line
**              windows.  wn_delrow() was taught to erase single line
**              windows and avoid using the BIOS for this special case.
**
**  03.19.87  - Argh!! Datalight elected to use M_I86 as a predefined
**              equate.  References to M_I86 were changed to
**              MSCV3 | MSCV4. (Datalight 3.XX)
**
**  The following changes were incorporated in the 03.15.87 release:
**
**  03.01.87  - wn_activate was incorrectly computing the coordinates of
**              unbordered windows.  Thanks to Peter Fletcher for reporting
**              the problem and supplying a solution.
**
**  01.22.87  - wn_dborder() was using the wrong attribute (wn-style,
**              instead of wn->bstyle). Thanks to Peter Partch for
**              reporting the problem and supplying a solution.
**
**  01.06.87  - wn_activate was not walking through the current linked
**              list of windows. In rare cases this would cause two
**              windows to be considered non-overlapping when in fact
**              they were.  Thanks to Robert Klotz for reporting the
**              problem.
**
**  The following changes were incorporated in the 01.01.87 release:
**
**  12.19.86  - Removed a needless call to wn_err(wn,"wn_printf") in
**              wn_title().
**
**  12.16.86  - Improved centering logic for window titles.
**              Thanks to Steve Liberty for suggesting the change.
**
**  12.14.86  - Incorporated compiler specific equates in windows.h.
**
**  12.13.86  - wns_mtype() returns 0 for mode 3, 2 for mode 0 or 2,
**              and 7 for mode 7. (Internal Use - This change allowed
**              for the prevention of blue on black characters when
**              the video mode is 2 and a color monitor is in use.
**              (wns_fixc & wns_mtype).
**
**            - BASIC support for Mark Williams "Lets C".
**
**            - Tightend free() checks in wn_activate, wn_close, and
**              wn_restore.
**
**  12.12.86  - wn_puts() was not adding the original physical cursor
**              location to the logical cursor location.
**              Thanks to Marek Glowacki for reporting the problem.
**
**  12.10.86  - Allow v_locate() to position the cursor slightly off
**              the screen.  Previous limit was (24,79) current limit
**              is (25,80) which is just beyond the edge of the screen.
**              This was done to insure that hidden cursors remain out
**              of view.
**
**            - Improved cursor handling when wn_dmaflg = FALSE.
**
**  12.09.86  - Taught wn_activate to honor cursor position of window
**              being activated. This will insure the cursor is always
**              in the right logical and physical position.
**              More cosmetic enhancement than logic error correction.
**
**  The following changes were incorporated in the 12.01.86 release:
**
**  11.28.86  - Reverse video attribute was not being set correctly
**              on MGAs - corrected.
**
**  11.19.86  - wn_dborder was incorrectly computing the row offset.
**              Thanks to Steve Thatcher for reporting the problem.
**
**  11.16.86  - Added ".smeth" member to window control block. This
**              member defines the scrolling method to be used in
**              the window. It can be set to BIOS or DMAS, the default
**              is DMAS.
**
**            - All routines that reference wn_activate will return
**              NULL if the window could not be activated.  This is
**              usually due to a lack of free memory.
**
**  The following changes were incorporated in the 11.14.86 release:
**
**  11.13.86  - Closing windows in random order when exiting "sometimes"
**              produced null pointer assignment error messages or
**              incorrect screen images - corrected.
**
**            - wn_natrib() was not storing the newly defined window
**              attribute in the window control block - corrected.
**
**  11.09.86  - Support for Datalight C added.
**
**  11.02.86  - v_border() added.  Allows color of border area to be
**              set on CGAs with color monitors.
**
**  11.01.86  - wn_fixcsr was not adding the original physical cursor
**              location to the logical cursor location.
**              Thanks to Bill Harts for reporting the problem.
**
**            - wn_puts was computing the virtual cursor location
**              incorrectly. Thanks to Eric Lundstrom!
**
**            - Logic to dectect null strings was incorporated into
**              _vidblt.  This will prevent 64k worth of trash from
**              being blitted to the video ram.
**
**  10.30.86  - All references to MSC in "windows.h" were changed
**              to M_I86.  This forces "windows.fns" to be included
**              under Microsoft C.  This change was also applied to
**              "windows.c".
**
**  10.26.86  - Full float, long, etc. support for wn_printf in
**              all Lattice versions.  Microsoft 3.XX is the only
**              one in the dark ages.
**
**  10.23.86  - Tip of the hat to Russ Thackson for the improved
**              overlaping window detection technique incorporated
**              in wn_activate().
**
**  The following changes were incorporated in the 10.22.86 release:
**
**  10.22.86  - wn_activate() was causing unnecessary window
**              thrashing on non-overlapping windows. Corrected.
**
**  The following changes were incorporated in the 10.10.86 release:
**
**  09.27.86  - Tiled windows are now supported! wn_activate() added.
**
**            - wn_gets() was not calling wns_err - corrected.  This
**              was not a bug, just continued support for wild pointer
**              checks.
**
**  09.25.86  - New logic for vidblt(). Fast mode now works on color
**              without causing snow or flicker!!  Video updates now
**              occur at the fastest possible speed!  The effect of
**              wn_sbit now conforms exactly to the description in the
**              manual.
**
**            - wn_printf (CI86) now has full float support. Thanks
**              to Rob Sullivan for reporting the CI86 problem. Lattice
**              and MSC Version 3.0 are the only hold outs for full
**              wn_print support.  MSC Version 3.0 support will never
**              be incorporated. If you are using MSC Version 3.00
**              you will have to upgrade to Version 4.XX.  The price
**              of the update is well worth it. Version 4.00 is a
**              work of art! Lattice support will be delayed until
**              Lattice gets around to supporting vsprintf() as
**              defined by the evolving ANSI standard.
**
**  09.17.86  - seperate modules to decrease memory overhead.
**
**            - link list support (wn_open,wn_close,WINDOWPTR struct)
**              This is the ground work for tiled window support.
**
**  09.02.86  - use registers in wns_savres() for speed (MSC).
**
**  The following changes were incorporated in the 08.30.86 release:
**
**  08.28.86  - wn_gets was delclared as (char *) but returning
**              (void).  Corrected to return (char *).
**
**  08.27.86  - wns_wtext() was not correctly handling borderless
**              windows. Corrected.
**
**            - wn_printf() was not correctly handing cases such as:
**              wn_printf(wn,"%s %d %f %d\n", "text", 2, 2.2, 5);
**              The window boss now supports a complete implementation
**              of printf formatting under Microsoft C Version 4.00.
**              All other compilers and versions support an INTEGER only
**              wn_printf.  This will be corrected in a future release.
**
**  08.16.86  - Added wn_gets(). Get string in window with validation.
**
**  The following chages were incorporated in the 06.02.86 release.
**
**  06.02.86  - v_smode was using bh instead of ah. Corrected.
**              Thanks to Rob Rainwater!!
**
**  05.26.86  - Added wn_natrib. Set new window attribute NOW!
**
**  05.25.86  - Corrected a potential problem with a couple of the routies
**              in MSVLIB.ASM. Registers SI & DI were being used but not
**              being saved. This "may" cause spurious probles with "C"
**              programs that use register variables.  Microsoft C 3.0 only.
**
**            - wn_titla was not calling wns_fixc. Corrected.
**
**  05.24.86  - Added wn_titla. write window title with attributes.
**
**  05.10.86  - wn_putsa was not calling wns_fixc.  This caused problems
**              when CGA was in mode bw80 but putsa was called with a
**              valid color atrib.
**
**  The following changes were incororated in the 05.08.86 release.
**
**  05.07.86  - Additions for Microsoft "C" version 3.0
**
**  05.05.86  - wn_printf fix for lattice version 3.0.
**
**  04.25.86  - Added support for handling backspace, delete, & BELL
**              characters correctly (wns_wtext).
**
**              Incorporated v_wtty in vlib.asm.
**
**  Initial Release..
**
**  01.24.86  - Initial release with a bit of a false start thanks to
**              Microsoft's Lib.
**
*/