Increase max terminal dimensions

doc/changes.md

@@ -3,6 +3,7 @@ This document covers what has changed in each release of C-Kermit for Windows
 (formerly known as Kermit 95). For a more in-depth look at what has changed, 
 check the git commit log.
 
+
 ## C-Kermit for Windows 10.0b10 beta 6 - coming soon
 
 This is a minor release focused on upgrading from OpenSSL 1.1.1 (which is
@@ -20,7 +21,6 @@ Windows XP. See the included SSH Readme for a workaround if SSH support on
 Windows XP.
 
 ### Fixed Bugs
-
 * Fixed directory listings not reporting a size or modified time for files
   requiring more than 32 bits to store the file size on Windows NT 3.51 and
   newer. This issue will remain on NT 3.1/3.50.
@@ -44,6 +44,11 @@ Windows XP.
   in builds that *do* have SSH support
 * Fixed `show network` command showing "SSH V1 and V2 protocols" when SSH V1 is
   no longer supported in C-Kermit for Windows.
+* Fixed not being able to resize the terminal area to greater than the primary
+  display in K95G. For example, if the window was moved on to a display that
+  was taller than the primary display and maximised the bottom of the terminal
+  screen would not be correctly rendered. This fix only applies to modern
+  versions of Windows.
 
 ### Minor Enhancements and other changes
 
@@ -63,6 +68,11 @@ Windows XP.
 * Upgraded to C-Kermit 10.0 Pre-Beta.11
 * About window (Help -> About) now includes the beta number
 * Added help text for `set terminal autopage` and `set terminal autoscroll`
+* Increased the maximum number of terminal columns from 256 to 512 in K95G.
+  This should be enough to fill a 4K display at with a 10pt font or larger.
+  As this change increases memory requirements by around 1MB whether the extra
+  columns are used or not, it has only been increased in builds targeting
+  modern PCs. Vintage PCs will still be limited to 256 columns.
 
 ### New features
 

kermit/k95/ckocon.h

@@ -87,7 +87,24 @@
 #endif /* min */
 
 #ifdef NT
+#ifdef KUI
+
+#if (defined(_MSC_VER) && _MSC_VER > 1400) || defined(__GNUC__)
+/*
+ * Don't increase max columns on compilers capable of targeting older versions
+ * of windows (VC++ 2005 is the last one capable of building for 9x and NT)
+ * as they could potentially be running on more resource constrained machines.
+ *
+ * This is a bit arbitrary and a bit of a hack - someday we'll allow this
+ * maximum to be changed at runtime solving this problem properly.
+ */
+#define MAXSCRNCOL  512            /* Maximum screen columns */
+#else
+#define MAXSCRNCOL  256            /* Maximum screen columns */
+#endif
+#else /* KUI */
 #define MAXSCRNCOL  256            /* Maximum screen columns */
+#endif /* KUI */
 #define MAXSCRNROW  128            /* Maximum screen rows    */
 #define MAXTERMSIZE (MAXSCRNCOL*MAXSCRNROW)
 #else /* NT */

kermit/k95/kui/kclient.hxx

@@ -17,7 +17,12 @@
 #include "kwin.hxx"
 #include "kscroll.hxx"
 
+/* MAXNUMCOL is also defined in ckocon.h */
+#if (defined(_MSC_VER) && _MSC_VER > 1400) || defined(__GNUC__)
+const int MAXNUMCOL = 512;
+#else
 const int MAXNUMCOL = 256;
+#endif
 struct _K_CLIENT_PAINT;
 struct _K_WORK_STORE;
 

kermit/k95/kui/ksysmets.cxx

@@ -17,8 +17,24 @@ KSysMetrics::~KSysMetrics()
 ------------------------------------------------------------------------*/
 void KSysMetrics::reset()
 {
+    /* SM_CXVIRTUALSCREEN only exists in Visual C++ 6.0 and newer */
+#ifndef SM_CXVIRTUALSCREEN
     _screenWidth = GetSystemMetrics( SM_CXSCREEN );
     _screenHeight = GetSystemMetrics( SM_CYSCREEN );
+#else
+    _screenWidth = GetSystemMetrics( SM_CXVIRTUALSCREEN );
+    _screenHeight = GetSystemMetrics( SM_CYVIRTUALSCREEN );
+
+    /* SM_CXVIRTUALSCREEN and SM_CYVIRTUALSCREEN are new to Windows 98.
+     * So check for a sensible value and if we don't get one, fall back
+     * to using the dimensions of the primary display */
+    if (_screenWidth < 1) {
+        _screenWidth = GetSystemMetrics( SM_CXSCREEN );
+    }
+    if (_screenHeight < 1) {
+        _screenHeight = GetSystemMetrics( SM_CYSCREEN );
+    }
+#endif
 
     _vscrollWidth = GetSystemMetrics( SM_CXVSCROLL );
     _hscrollHeight = GetSystemMetrics( SM_CYHSCROLL );