Add feature-override options

A few (dangerous) options are added to allow a user to override
engine features, or change their defaults, by supplying a string
with feature commands (e.g. "sigint=0") which tricks XBoard into
thinking the engine sent that. There is a -featureDefaults which is
processed before the engine features, and -first/secondFeatures
which is parsed just before engine initialization.
  This goes horribly wrong when the user wouldtry silly things like
including 'option' or 'done' features!

diff --git a/args.h b/args.h
index d7a77a2..92f05af 100644 (file)
--- a/args.h
+++ b/args.h
@@ -617,6 +617,9 @@ ArgDescriptor argDescriptors[] = {
   { "autoLogo", ArgBoolean, (void *) &appData.autoLogo, TRUE, INVALID },
   { "firstOptions", ArgString, (void *) &appData.firstOptions, FALSE, (ArgIniType) "" },
   { "secondOptions", ArgString, (void *) &appData.secondOptions, FALSE, (ArgIniType) "" },
+  { "firstFeatures", ArgString, (void *) &appData.features[0], FALSE, (ArgIniType) "" },
+  { "secondFeatures", ArgString, (void *) &appData.features[1], FALSE, (ArgIniType) "" },
+  { "featureDefaults", ArgString, (void *) &appData.featureDefaults, TRUE, (ArgIniType) "" },
   { "firstNeedsNoncompliantFEN", ArgString, (void *) &appData.fenOverride1, FALSE, (ArgIniType) NULL },
   { "secondNeedsNoncompliantFEN", ArgString, (void *) &appData.fenOverride2, FALSE, (ArgIniType) NULL },
   { "keepAlive", ArgInt, (void *) &appData.keepAlive, FALSE, INVALID },

diff --git a/backend.c b/backend.c
index 9c96909..ca3e342 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -834,6 +834,7 @@ InitEngine(ChessProgramState *cps, int n)
       }
 
     InitEngineUCI( installDir, cps );  // [HGM] moved here from winboard.c, to make available in xboard
+    ParseFeatures(appData.featureDefaults, cps);
 }
 
 ChessProgramState *savCps;
@@ -9539,6 +9540,7 @@ InitChessProgram(cps, setup)
     hintRequested = FALSE;
     bookRequested = FALSE;
 
+    ParseFeatures(appData.features[cps == &second], cps); // [HGM] allow user to overrule features
     /* [HGM] some new WB protocol commands to configure engine are sent now, if engine supports them */
     /*       moved to before sending initstring in 4.3.15, so Polyglot can delay UCI 'isready' to recepton of 'new' */
     if(cps->memSize) { /* [HGM] memory */

diff --git a/common.h b/common.h
index 5dc5287..e76320c 100644 (file)
--- a/common.h
+++ b/common.h
@@ -649,6 +649,8 @@ typedef struct {
     Boolean noGUI;      /* [HGM] fast: suppress all display updates */
     char *engOptions[ENGINES]; /* [HGM] options   */
     char *fenOverride[ENGINES];
+    char *features[ENGINES];
+    char *featureDefaults;
     Boolean keepAlive;  /* [HGM] alive     */
     Boolean forceIllegal;/*[HGM] illegal   */
     Boolean noJoin;     /* [HGM] join      */