Change INT 21h and file I/O logging so that it is default off, but can be enabled from dosbox.conf

CHANGELOG

@@ -1,6 +1,9 @@
 0.83.1
   - Added INT 21h debug logging for file I/O and general
-    INT 21h usage [patch by ognjenmi]
+    INT 21h usage [patch by ognjenmi]. Added enables for
+    the logging which are off by default since the INT 21h
+    and file I/O logging are fairly noisy under normal
+    usage.
 
 0.83.0
   - Added mt32.romdir dosbox.conf configuration option

src/debug/debug_gui.cpp

@@ -42,6 +42,9 @@
 
 using namespace std;
 
+bool log_int21 = false;
+bool log_fileio = false;
+
 static bool has_LOG_Init = false;
 static bool has_LOG_EarlyInit = false;
 static bool do_LOG_stderr = false;
@@ -826,6 +829,9 @@ void LOG::Init() {
 		debuglog=0;
 	}
 
+    log_int21 = sect->Get_bool("int21");
+    log_fileio = sect->Get_bool("fileio");
+
 	/* end of early init logging */
 	do_LOG_stderr = false;
 
@@ -924,5 +930,13 @@ void LOG::SetupConfigSection(void) {
 		Pstring->Set_values(log_values);
 		Pstring->Set_help("Enable/Disable logging of this type.");
     }
+
+    Prop_bool* Pbool;
+
+    Pbool = sect->Add_bool("int21",Property::Changeable::Always,false);
+    Pbool->Set_help("Log all INT 21h calls");
+
+    Pbool = sect->Add_bool("fileio",Property::Changeable::Always,false);
+    Pbool->Set_help("Log file I/O through INT 21h");
 }
 

src/dos/dos.cpp

@@ -37,6 +37,9 @@
 #include "serialport.h"
 #include "dos_network.h"
 
+extern bool log_int21;
+extern bool log_fileio;
+
 Bitu INT29_HANDLER(void);
 Bit32u BIOS_get_PC98_INT_STUB(void);
 
@@ -415,6 +418,14 @@ void XMS_DOS_LocalA20EnableIfNotEnabled(void);
 static Bitu DOS_21Handler(void) {
     bool unmask_irq0 = false;
 
+    /* NTS to ognjenmi: Your INT 21h logging patch was modified to log ALL INT 21h calls (the original
+     *                  placement put it after the ignore case below), and is now conditional on
+     *                  whether INT 21h logging is enabled. Also removed unnecessary copying of reg_al
+     *                  and reg_ah to auto type variables. */
+    if (log_int21) {
+        LOG(LOG_CPU, LOG_DEBUG)("Executing interrupt 21, ah=%x, al=%x", reg_ah, reg_al);
+    }
+
     /* Real MS-DOS behavior:
      *   If HIMEM.SYS is loaded and CONFIG.SYS says DOS=HIGH, DOS will load itself into the HMA area.
      *   To prevent crashes, the INT 21h handler down below will enable the A20 gate before executing
@@ -433,9 +444,6 @@ static Bitu DOS_21Handler(void) {
     char name2[DOSNAMEBUF+2+DOS_NAMELENGTH_ASCII];
     
     static Bitu time_start = 0; //For emulating temporary time changes.
-    auto ah = reg_ah;
-    auto al = reg_al;
-    LOG(LOG_CPU, LOG_DEBUG)("Executing interrupt 21, ah=%x, al=%x", ah, al);
     switch (reg_ah) {
         case 0x00:      /* Terminate Program */
             /* HACK for demoscene prod parties/1995/wired95/surprisecode/w95spcod.zip/WINNERS/SURP-KLF

src/dos/dos_files.cpp

@@ -40,6 +40,9 @@
 #define FCB_ERR_EOF     3
 #define FCB_ERR_WRITE   1
 
+extern bool log_int21;
+extern bool log_fileio;
+
 Bitu DOS_FILES = 127;
 DOS_File ** Files = NULL;
 DOS_Drive * Drives[DOS_DRIVES] = {NULL};
@@ -369,7 +372,9 @@ bool DOS_ReadFile(Bit16u entry,Bit8u * data,Bit16u * amount,bool fcb) {
 		return false;
 	}
 
+    if (log_fileio) {
         LOG(LOG_FILES, LOG_DEBUG)("Reading %d bytes from %s ", *amount, Files[handle]->name);
+    }
 /*
 	if ((Files[handle]->flags & 0x0f) == OPEN_WRITE)) {
 		DOS_SetError(DOSERR_INVALID_HANDLE);
@@ -397,7 +402,9 @@ bool DOS_WriteFile(Bit16u entry,Bit8u * data,Bit16u * amount,bool fcb) {
 		return false;
 	}
 
+    if (log_fileio) {
         LOG(LOG_FILES, LOG_DEBUG)("Writing %d bytes to %s", *amount, Files[handle]->name);
+    }
 /*
 	if ((Files[handle]->flags & 0x0f) == OPEN_READ)) {
 		DOS_SetError(DOSERR_INVALID_HANDLE);
@@ -459,7 +466,9 @@ bool DOS_CloseFile(Bit16u entry, bool fcb) {
 		return false;
 	}
     if (Files[handle]->IsOpen()) {
+        if (log_fileio) {
             LOG(LOG_FILES, LOG_NORMAL)("Closing file %s", Files[handle]->name);
+        }
         Files[handle]->Close();
 	}
 
@@ -673,7 +682,9 @@ bool DOS_OpenFileExtended(char const * name, Bit16u flags, Bit16u createAttr, Bi
 bool DOS_UnlinkFile(char const * const name) {
 	char fullname[DOS_PATHLENGTH];Bit8u drive;
     // An existing device returns an access denied error
+    if (log_fileio) {
         LOG(LOG_FILES, LOG_NORMAL)("Deleting file %s", name);
+    }
     if (DOS_FindDevice(name) != DOS_DEVICES) {
 		DOS_SetError(DOSERR_ACCESS_DENIED);
 		return false;