===================================================================
RCS file: /home/cvs/OpenXM/src/kan96xx/Kan/ext.c,v
retrieving revision 1.1.1.1
retrieving revision 1.38
diff -u -p -r1.1.1.1 -r1.38
--- OpenXM/src/kan96xx/Kan/ext.c	1999/10/08 02:12:02	1.1.1.1
+++ OpenXM/src/kan96xx/Kan/ext.c	2005/07/03 11:08:53	1.38
@@ -1,4 +1,6 @@
+/* $OpenXM: OpenXM/src/kan96xx/Kan/ext.c,v 1.37 2005/06/16 06:21:21 takayama Exp $ */
 #include <stdio.h>
+#include <string.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -11,21 +13,30 @@
 #include "extern2.h"
 #include <signal.h>
 #include "plugin.h"
+#include "kclass.h"
+#include <ctype.h>
+#include <errno.h>
+#include <regex.h>
+#include "ox_pathfinder.h"
 
+extern int Quiet;
+extern char **environ;
+
 #define MYCP_SIZE 100
 static int Mychildren[MYCP_SIZE];
 static int Mycp = 0;
+static int Verbose_mywait = 0;
 static void mywait() {
   int status;
   int pid;
   int i,j;
-  signal(SIGCHLD,SIG_IGN);
+  /* signal(SIGCHLD,SIG_IGN); */
   pid = wait(&status);
-  fprintf(stderr,"Child process %d is exiting.\n",pid);
+  if ((!Quiet) && (Verbose_mywait)) fprintf(stderr,"Child process %d is exiting.\n",pid);
   for (i=0; i<Mycp; i++) {
     if (Mychildren[i]  == pid) {
       for (j=i; j<Mycp-1; j++) {
-	Mychildren[j] = Mychildren[j+1];
+        Mychildren[j] = Mychildren[j+1];
       }
       if (Mycp > 0) Mycp--;
     }
@@ -34,9 +45,14 @@ static void mywait() {
 }
 
 #define SIZE_OF_ENVSTACK 5
-static jmp_buf EnvStack[SIZE_OF_ENVSTACK];
+#if defined(__CYGWIN__)
+#define JMP_BUF sigjmp_buf
+#else
+#define JMP_BUF jmp_buf
+#endif
+static JMP_BUF EnvStack[SIZE_OF_ENVSTACK];
 static int Envp = 0;
-static void pushEnv(jmp_buf jb) {
+static void pushEnv(JMP_BUF jb) {
   if (Envp < SIZE_OF_ENVSTACK) {
     *(EnvStack[Envp]) = *jb;
     Envp++;
@@ -45,7 +61,7 @@ static void pushEnv(jmp_buf jb) {
     exit(2);
   }
 }
-static void popEnv(jmp_buf jbp) {
+static void popEnv(JMP_BUF jbp) {
   if (Envp <= 0) {
     fprintf(stderr,"Underflow of EnvStack.\n");
     exit(3);
@@ -73,28 +89,39 @@ static char *ext_generateUniqueFileName(char *s)
   return(NULL);
 }
 
+static struct object oregexec(struct object oregex,struct object ostrArray,struct object oflag);
+
 struct object Kextension(struct object obj)
 {
   char *key;
   int size;
-  struct object keyo;
+  struct object keyo = OINIT;
   struct object rob = NullObject;
-  struct object obj1,obj2,obj3,obj4;
-  int m,i;
+  struct object obj1 = OINIT;
+  struct object obj2 = OINIT;
+  struct object obj3 = OINIT;
+  struct object obj4 = OINIT;
+  int m,i,pid, uid;
   int argListc, fdListc;
   char *abc;
   char *abc2;
   extern struct context *CurrentContextp;
+#if (__CYGWIN__)
+  extern sigjmp_buf EnvOfStackMachine;
+#else
   extern jmp_buf EnvOfStackMachine;
+#endif
   extern void ctrlC();
   extern int SigIgn;
-  extern errno;
   extern int DebugCMO;
   extern int OXprintMessage;
   struct stat buf;
   char **argv;
   FILE *fp;
-  void (*oldsig)();  
+  void (*oldsig)();
+  extern SecureMode;
+  extern char *UD_str;
+  extern int UD_attr;
 
   if (obj.tag != Sarray) errorKan1("%s\n","Kextension(): The argument must be an array.");
   size = getoaSize(obj);
@@ -128,150 +155,462 @@ struct object Kextension(struct object obj)
     obj1 = getoa(obj,1);
     if (obj1.tag != Sinteger) errorKan1("%s\n","[(chattrs)  num] extension.");
     m = KopInteger(obj1);
-    if (!( m == 0 || m == PROTECT || m == ABSOLUTE_PROTECT))
-      errorKan1("%s\n","The number must be 0, 1 or 2.");
+	/* if (!( m == 0 || m == PROTECT || m == ABSOLUTE_PROTECT || m == ATTR_INFIX))
+	   errorKan1("%s\n","The number must be 0, 1 or 2.");*/
     putUserDictionary2((char *)NULL,0,0,m | SET_ATTR_FOR_ALL_WORDS,
-		       CurrentContextp->userDictionary);
+                       CurrentContextp->userDictionary);
+  }else if (strcmp(key,"or_attrs")==0) {
+    if (size != 2) errorKan1("%s\n","[(or_attrs)  num] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sinteger) errorKan1("%s\n","[(or_attrs)  num] extension.");
+    m = KopInteger(obj1);
+    putUserDictionary2((char *)NULL,0,0,m | OR_ATTR_FOR_ALL_WORDS,
+                       CurrentContextp->userDictionary);
   }else if (strcmp(key,"keywords")==0) {
     if (size != 1) errorKan1("%s\n","[(keywords)] extension.");
     rob = showSystemDictionary(1);
     /*  }else if (strcmp(key,"fork0")==0) {
-	if (size != 2) errorKan1("%s\n","[(fork0) sss] extension.");
-	m = fork();
-	if (m>0) { rob = KpoInteger(m); }
-	else {
-	  system(KopString(getoa(obj,1))); exit(0);
-	} */
-    }else if (strcmp(key,"defaultPolyRing")==0) {
-      if (size != 2) errorKan1("%s\n","[(defaultPolyRing) n] extension.");
-      rob = KdefaultPolyRing(getoa(obj,1));
-    }else if (strcmp(key,"getenv")==0) {
-      if (size != 2) errorKan1("%s\n","[(getenv) envstr] extension.");
-      obj1 = getoa(obj,1);
-      if (obj1.tag != Sdollar) errorKan1("%s\n","[(getenv) envstr] extension");
-      abc = getenv(KopString(obj1));
-      if (abc == NULL) {
-	rob = NullObject;
+        if (size != 2) errorKan1("%s\n","[(fork0) sss] extension.");
+        m = fork();
+        if (m>0) { rob = KpoInteger(m); }
+        else {
+        system(KopString(getoa(obj,1))); exit(0);
+        } */
+  }else if (strcmp(key,"defaultPolyRing")==0) {
+    if (size != 2) errorKan1("%s\n","[(defaultPolyRing) n] extension.");
+    rob = KdefaultPolyRing(getoa(obj,1));
+  }else if (strcmp(key,"getenv")==0) {
+    if (size != 2) errorKan1("%s\n","[(getenv) envstr] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","[(getenv) envstr] extension");
+    abc = getenv(KopString(obj1));
+#if defined(__CYGWIN__)
+    if (abc == NULL) {
+	  abc2 = (char *)sGC_malloc(sizeof(char)*(strlen(KopString(obj1))+2));
+      strcpy(abc2,KopString(obj1));
+	  for (i=0; i<strlen(abc2); i++) {
+		abc2[i] = toupper(abc2[i]);
+	  }
+      abc = getenv(abc2);
+    }
+#endif
+    if (abc == NULL) {
+      rob = NullObject;
+    }else{
+      abc2 = (char *)sGC_malloc(sizeof(char)*(strlen(abc)+2));
+      strcpy(abc2,abc);
+      rob = KpoString(abc2);
+    }
+  }else if (strcmp(key,"stat")==0) {
+    if (size != 2) errorKan1("%s\n","[(stat) fname] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","[(stat) fname] extension ; string fname.");
+    m = stat(KopString(obj1),&buf);
+    rob = newObjectArray(2);
+    if (m == -1) {
+      /* fail */
+      obj2 = NullObject;
+      putoa(rob,0,obj2);
+      obj3 = newObjectArray(2);
+      putoa(obj3,0,KpoString("error no"));
+      putoa(obj3,1,KpoInteger(errno));
+      putoa(rob,1,obj3);
+    }else{
+      /* success */
+      putoa(rob,0,KpoInteger(0));
+      obj3 = newObjectArray(1);
+      putoa(obj3,0,KpoInteger((int) buf.st_size));
+      putoa(rob,1,obj3); /* We have not yet read buf fully */
+    }
+  }else if (strcmp(key,"gethostname")==0) {
+    abc = (char *)sGC_malloc(sizeof(char)*1024);
+    if (gethostname(abc,1023) < 0) {
+	  errorKan1("%s\n","hostname could not be obtained.");
+	}
+	rob = KpoString(abc);
+  }else if (strcmp(key,"forkExec")==0) {
+    if (size != 4) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension.");
+    obj1 = getoa(obj,1);
+	if (obj1.tag == Sdollar) {
+	  obj1 = KstringToArgv(obj1);
+	}
+    if (obj1.tag != Sarray) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension. array argList.");
+	obj2 = getoa(obj,2);
+    if (obj2.tag != Sarray) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension. array fdList.");
+    obj3 = getoa(obj,3);
+    if (obj3.tag != Sinteger) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension. integer sigblock.");
+    m = KopInteger(obj3);  /* m&1 : block ctrl-C. */
+    argListc = getoaSize(obj1);
+    fdListc =  getoaSize(obj2);
+    if ((pid = fork()) > 0) {
+      /* parent */
+      if (m&2) {
+         /* Do not call singal to turn around a trouble on cygwin. BUG. */
       }else{
-	abc2 = (char *)sGC_malloc(sizeof(char)*(strlen(abc)+2));
-	strcpy(abc2,abc);
-	rob = KpoString(abc2);
+         signal(SIGCHLD,mywait); /* to kill Zombie */
       }
-    }else if (strcmp(key,"stat")==0) {
-      if (size != 2) errorKan1("%s\n","[(stat) fname] extension.");
-      obj1 = getoa(obj,1);
-      if (obj1.tag != Sdollar) errorKan1("%s\n","[(stat) fname] extension ; string fname.");
-      m = stat(KopString(obj1),&buf);
-      rob = newObjectArray(2);
-      if (m == -1) {
-	/* fail */
-	obj2 = NullObject;
-	putoa(rob,0,obj2);
-	obj3 = newObjectArray(2);
-	putoa(obj3,0,KpoString("error no"));
-	putoa(obj3,1,KpoInteger(errno));
-	putoa(rob,1,obj3);
-      }else{
-	/* success */
-	putoa(rob,0,KpoInteger(0));
-	putoa(rob,1,newObjectArray(0)); /* We have not yet read buf */
+      Mychildren[Mycp++] = pid;
+      if (Mycp >= MYCP_SIZE-1) {
+        errorKan1("%s\n","Child process table is full.\n");
+        Mycp = 0;
       }
-    }else if (strcmp(key,"forkExec")==0) {
-      if (size != 4) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension.");
-      obj1 = getoa(obj,1);
-      if (obj1.tag != Sarray) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension. array argList.");
-      obj2 = getoa(obj,2);
-      if (obj2.tag != Sarray) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension. array fdList.");
-      obj3 = getoa(obj,3);
-      if (obj3.tag != Sinteger) errorKan1("%s\n","[(forkExec) argList fdList sigblock] extension. integer sigblock.");
-      m = KopInteger(obj3);  /* m == 1 : block ctrl-C. */
-      argListc = getoaSize(obj1);
-      fdListc =  getoaSize(obj2);
-      if ((m = fork()) > 0) {
-	/* parent */
-	signal(SIGCHLD,mywait); /* to kill Zombie */
-	Mychildren[Mycp++] = m;
-	if (Mycp >= MYCP_SIZE-1) {
-	  errorKan1("%s\n","Child process table is full.\n");
-	  Mycp = 0;
-	}
-	rob = KpoInteger(m);
-	/* Done */
-      }else{
-	/* Child */
-	for (i=0; i<fdListc; i++) {
-	  /* close the specified files */
-	  close(KopInteger(getoa(obj2,i)));
-	}
-	/* execl */
-	if (m == 1) {
-	  {
-	    sigset_t sss;
-	    sigemptyset(&sss);
-	    sigaddset(&sss,SIGINT);
-	    sigprocmask(SIG_BLOCK,&sss,NULL);
+      rob = KpoInteger(pid);
+      /* Done */
+    }else{
+      /* Child */
+      for (i=0; i<fdListc; i++) {
+        /* close the specified files */
+        close(KopInteger(getoa(obj2,i)));
+      }
+      /* execl */
+      if (m&1) {
+        {
+          sigset_t sss;
+          sigemptyset(&sss);
+          sigaddset(&sss,SIGINT);
+          sigprocmask(SIG_BLOCK,&sss,NULL);
+        }
+      }
+      argv = (char **) sGC_malloc(sizeof(char *)*(argListc+1));
+      if (argv == NULL) {
+        fprintf(stderr," no more momory. forkExec --- exiting.\n");
+        _exit(10);
+      }
+      for (i=0; i<argListc; i++) {
+        argv[i] = KopString(getoa(obj1,i));
+        argv[i+1] = NULL;
+      }
+      
+      if (m&4) {
+	fprintf(stderr,"execv %s\n",argv[0]);
+	sleep(5);
+        fprintf(stderr,">>>\n");
+      }
+      execve(argv[0],argv,environ);
+      /* This place will never be reached unless execv fails. */
+      fprintf(stderr,"forkExec fails: ");
+      for (i=0; i<argListc; i++) {
+        fprintf(stderr,"%s ",argv[i]);
+      }
+      fprintf(stderr,"\nExiting, but staying as Zombie.\n");
+      _exit(10);
+    }
+  }else if (strcmp(key,"getchild")==0) {
+    if (size != 1) errorKan1("%s\n","[(getchild)] extension.");
+    rob = newObjectArray(Mycp);
+    for (i=0; i<Mycp; i++) {
+      putoa(rob,i,KpoInteger(Mychildren[i]));
+    }
+  }else if (strcmp(key,"getUniqueFileName")==0) {
+    if (size != 2) errorKan1("%s\n","[(getUniqueFileName) path] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","[(getUniqueFileName) path] extension. path must be a string.");
+    rob = KpoString(ext_generateUniqueFileName(KopString(obj1)));
+  }else if (strcmp(key,"outputObjectToFile")==0) {
+    if (size != 3) errorKan1("%s\n","[(outputObjectToFile) path obj] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","[(outputObjectToFile) path obj] extension. path must be a string.");
+    obj2 = getoa(obj,2);
+    fp = fopen(KopString(obj1),"w");
+    if (fp == NULL) errorKan1("%s\n","[(outputObjectToFile) path object] extension : could not open the path.");
+    printObject(obj2,0,fp);
+    fclose(fp);
+    rob = NullObject;
+  }else if (strcmp(key,"getAttributeList")==0) {
+    if (size != 2) errorKan1("%s\n","[(getAttributeList) ob] extension rob");
+    rob = KgetAttributeList(getoa(obj,1));
+  }else if (strcmp(key,"setAttributeList")==0) {
+    if (size != 3) errorKan1("%s\n","[(setAttributeList) ob attrlist] extension rob");
+    rob = KsetAttributeList(getoa(obj,1), getoa(obj,2));
+  }else if (strcmp(key,"getAttribute")==0) {
+    if (size != 3) errorKan1("%s\n","[(getAttribute) ob key] extension rob");
+    rob = KgetAttribute(getoa(obj,1),getoa(obj,2));
+  }else if (strcmp(key,"setAttribute")==0) {
+    if (size != 4) errorKan1("%s\n","[(setAttributeList) ob key value] extension rob");
+    rob = KsetAttribute(getoa(obj,1), getoa(obj,2),getoa(obj,3));
+  }else if (strcmp(key,"hilbert")==0) {
+    if (size != 3) errorKan1("%s\n","[(hilbert) obgb obvlist] extension.");
+    rob = hilberto(getoa(obj,1),getoa(obj,2));
+  }else if (strcmp(key,"nobody") == 0) {
+      uid = getuid();
+	  if (uid == 0) {
+#define NOBODY 65534
+		/* If I'm a super user, then change uid to nobody. */
+		if (setuid(NOBODY) != 0) {
+		  fprintf(stderr,"Failed to change uid to nobody (%d)\n",NOBODY);
+		  exit(10);
+		}
+		fprintf(stderr,"uid is changed to nobody (%d).\n",NOBODY);
+		rob.tag = Snull;
 	  }
-	}
-	argv = (char **) sGC_malloc(sizeof(char *)*(argListc+1));
-	if (argv == NULL) {
-	  fprintf(stderr," no more momory. forkExec --- exiting.\n");
-	  _exit(10);
-	}
-	for (i=0; i<argListc; i++) {
-	  argv[i] = KopString(getoa(obj1,i));
-	  argv[i+1] = NULL;
-	}
-	execv(argv[0],argv);
-        /* This place will never be reached unless execv fails. */
-        fprintf(stderr,"forkExec fails: ");
-	for (i=0; i<argListc; i++) {
-	  fprintf(stderr,"%s ",argv[i]);
-	}
-	fprintf(stderr,"\nExiting, but staying as Zombie.\n");
-	_exit(10);
+  }else if (strcmp(key,"chattr")==0) {
+    if (size != 3) errorKan1("%s\n","[(chattr)  num symbol] extension.");
+    obj1 = getoa(obj,1);
+    obj2 = getoa(obj,2);
+    if (obj1.tag != Sinteger) errorKan1("%s\n","[(chattr)  num symbol] extension.");
+    if (obj2.tag != Sstring)  errorKan1("%s\n","[(chattr)  num symbol] extension.");
+    m = KopInteger(obj1);
+	/* if (!( m == 0 || m == PROTECT || m == ABSOLUTE_PROTECT || m == ATTR_INFIX))
+	   errorKan1("%s\n","The number must be 0, 1 or 2.");*/
+    putUserDictionary2(obj2.lc.str,(obj2.rc.op->lc).ival,(obj2.rc.op->rc).ival,
+                       m,CurrentContextp->userDictionary);
+  }else if (strcmp(key,"or_attr")==0) {
+    if (size != 3) errorKan1("%s\n","[(or_attr)  num symbol] extension.");
+    obj1 = getoa(obj,1);
+    obj2 = getoa(obj,2);
+    if (obj1.tag != Sinteger) errorKan1("%s\n","[(or_attr)  num symbol] extension.");
+    if (obj2.tag != Sstring)  errorKan1("%s\n","[(or_attr)  num symbol] extension.");
+    m = KopInteger(obj1);
+    rob = KfindUserDictionary(obj2.lc.str);
+    if (rob.tag != NoObject.tag) {
+      if (strcmp(UD_str,obj2.lc.str) == 0) {
+        m |= UD_attr;
+      }else errorKan1("%s\n","or_attr: internal error.");
+    }
+    rob = KpoInteger(m);
+    putUserDictionary2(obj2.lc.str,(obj2.rc.op->lc).ival,(obj2.rc.op->rc).ival,
+                       m,CurrentContextp->userDictionary);
+  }else if (strcmp(key,"getattr")==0) {
+    if (size != 2) errorKan1("%s\n","[(getattr) symbol] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sstring)  errorKan1("%s\n","[(getattr) symbol] extension.");
+    rob = KfindUserDictionary(obj1.lc.str);
+	if (rob.tag != NoObject.tag) {
+	  if (strcmp(UD_str,obj1.lc.str) == 0) {
+		rob = KpoInteger(UD_attr);
+	  }else errorKan1("%s\n","getattr: internal error.");
+	}else rob = NullObject;
+  }else if (strcmp(key,"getServerEnv")==0) {
+    if (size != 2) errorKan1("%s\n","[(getServerEnv) serverName] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","[(getServerEnv) serverName] extension.");
+    {
+      char **se; int ii; int nn;
+      se = getServerEnv(KopString(obj1));
+      if (se == NULL) {
+        debugServerEnv(KopString(obj1));
+        rob = NullObject;
+      }else{
+        for (ii=0,nn=0; se[ii] != NULL; ii++) nn++;
+        rob = newObjectArray(nn);
+        for (ii=0; ii<nn; ii++) {
+          putoa(rob,ii,KpoString(se[ii]));
+        }
       }
-    }else if (strcmp(key,"getchild")==0) {
-      if (size != 1) errorKan1("%s\n","[(getchild)] extension.");
-      rob = newObjectArray(Mycp);
-      for (i=0; i<Mycp; i++) {
-	putoa(rob,i,KpoInteger(Mychildren[i]));
+    }
+  }else if (strcmp(key,"read")==0) {
+    if (size != 3) errorKan1("%s\n","[(read) fd size] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sinteger) errorKan1("%s\n","[(read) fd size] extension. fd must be an integer.");
+    obj2 = getoa(obj,2);
+    if (obj2.tag != Sinteger) errorKan1("%s\n","[(read) fd size] extension. size must be an integer.");
+    {
+      int total, n, fd;
+      char *s; char *s0;
+      fd = KopInteger(obj1);
+      total = KopInteger(obj2);
+      if (total <= 0) errorKan1("%s\n","[(read) ...]; negative size has not yet been implemented.");
+      /* Return a string. todo: implement SbyteArray case. */
+      s0 = s = (char *) sGC_malloc(total+1);
+      if (s0 == NULL) errorKan1("%s\n","[(read) ...]; no more memory."); 
+      while (total >0) {
+        n = read(fd, s, total);
+        if (n < 0) { perror("read"); errorKan1("%s\n","[(read) ...]; read error.");}
+        s[n] = 0;
+        total -= n;  s = &(s[n]);
       }
-    }else if (strcmp(key,"getUniqueFileName")==0) {
-      if (size != 2) errorKan1("%s\n","[(getUniqueFileName) path] extension.");
-      obj1 = getoa(obj,1);
-      if (obj1.tag != Sdollar) errorKan1("%s\n","[(getUniqueFileName) path] extension. path must be a string.");
-      rob = KpoString(ext_generateUniqueFileName(KopString(obj1)));
-    }else if (strcmp(key,"outputObjectToFile")==0) {
-      if (size != 3) errorKan1("%s\n","[(outputObjectToFile) path obj] extension.");
-      obj1 = getoa(obj,1);
-      if (obj1.tag != Sdollar) errorKan1("%s\n","[(outputObjectToFile) path obj] extension. path must be a string.");
-      obj2 = getoa(obj,2);
-      fp = fopen(KopString(obj1),"w");
-      if (fp == NULL) errorKan1("%s\n","[(outputObjectToFile) path object] extension : could not open the path.");
-      printObject(obj2,0,fp);
-      fclose(fp);
+      rob = KpoString(s0);
+    }
+  }else if (strcmp(key,"regionMatches")==0) {
+    if (size != 3) errorKan1("%s\n","[(regionMatches) str strArray] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","[(regionMatches) str strArray] extension. str must be a string.");
+	obj2 = getoa(obj,2);
+    if (obj2.tag != Sarray) errorKan1("%s\n","[(regionMatches) str strArray] extension. strArray must be an array.");
+    rob = KregionMatches(obj1,obj2);
+  }else if (strcmp(key,"newVector")==0) {
+    if (size != 2) errorKan1("%s\n","[(newVector) m] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sinteger) errorKan1("%s\n","[(newVector) m] extension. m must be an integer.");
+    rob = newObjectArray(KopInteger(obj1));
+  }else if (strcmp(key,"newMatrix")==0) {
+    if (size != 3) errorKan1("%s\n","[(newMatrix) m n] extension.");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sinteger) errorKan1("%s\n","[(newMatrix) m n] extension. m must be an integer.");
+	obj2 = getoa(obj,2);
+    if (obj2.tag != Sinteger) errorKan1("%s\n","[(newMatrix) m n] extension. n must be an integer.");
+    rob = newObjectArray(KopInteger(obj1));
+	for (i=0; i<KopInteger(obj1); i++) {
+      putoa(rob,i,newObjectArray(KopInteger(obj2)));
+	}
+  }else if (strcmp(key,"ooPower")==0) {
+    if (size != 3) errorKan1("%s\n","[(ooPower) a b] extension.");
+    obj1 = getoa(obj,1);
+	obj2 = getoa(obj,2);
+    rob = KooPower(obj1,obj2);
+  }else if (strcmp(key,"Krest")==0) {
+    if (size != 2) errorKan1("%s\n","[(Krest) a] extension b");
+    obj1 = getoa(obj,1);
+    rob = Krest(obj1);
+  }else if (strcmp(key,"Kjoin")==0) {
+    if (size != 3) errorKan1("%s\n","[(Kjoin) a b] extension c");
+    obj1 = getoa(obj,1);
+	obj2 = getoa(obj,2);
+    rob = Kjoin(obj1,obj2);
+  }else if (strcmp(key,"ostype")==0) {
+    rob = newObjectArray(1);
+    /* Hard encode the OS type. */
+#if defined(__CYGWIN__)
+    putoa(rob,0,KpoString("windows"));
+#else
+    putoa(rob,0,KpoString("unix"));
+#endif
+  }else if (strcmp(key,"traceClearStack")==0) {
+    traceClearStack();
+    rob = NullObject;
+  }else if (strcmp(key,"traceShowStack")==0) {
+    char *ssst;
+    ssst = traceShowStack();
+    if (ssst != NULL) {
+      rob = KpoString(ssst);
+    }else{
       rob = NullObject;
-    }else if (strcmp(key,"hilbert")==0) {
-      if (size != 3) errorKan1("%s\n","[(hilbert) obgb obvlist] extension.");
-      rob = hilberto(getoa(obj,1),getoa(obj,2));
-    }else if (strcmp(key,"chattr")==0) {
-      if (size != 3) errorKan1("%s\n","[(chattr)  num symbol] extension.");
-      obj1 = getoa(obj,1);
-      obj2 = getoa(obj,2);
-      if (obj1.tag != Sinteger) errorKan1("%s\n","[(chattr)  num symbol] extension.");
-      if (obj2.tag != Sstring)  errorKan1("%s\n","[(chattr)  num symbol] extension.");
-      m = KopInteger(obj1);
-      if (!( m == 0 || m == PROTECT || m == ABSOLUTE_PROTECT))
-	errorKan1("%s\n","The number must be 0, 1 or 2.");
-      putUserDictionary2(obj2.lc.str,(obj2.rc.op->lc).ival,(obj2.rc.op->rc).ival,
-			 m,CurrentContextp->userDictionary);
     }
+  }else if (strcmp(key,"regexec")==0) {
+    if ((size != 3) && (size != 4)) errorKan1("%s\n","[(regexec) reg strArray flag(optional)] extension b");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","regexec, the first argument should be a string (regular expression).");
+    obj2 = getoa(obj,2); 
+    if (obj2.tag != Sarray) errorKan1("%s\n","regexec, the second argument should be an array of a string.");
+    if (size == 3) obj3 = newObjectArray(0);
+    else obj3 = getoa(obj,3);
+    rob = oregexec(obj1,obj2,obj3);
+  }else if (strcmp(key,"unlink")==0) {
+    if (size != 2) errorKan1("%s\n","[(unlink) filename] extension b");
+    obj1 = getoa(obj,1);
+    if (obj1.tag != Sdollar) errorKan1("%s\n","unlink, the first argument should be a string (filename).");
+    rob = KpoInteger(oxDeleteFile(KopString(obj1)));
+  }
 #include "plugin.hh"
+#include "Kclass/tree.hh"
   else{
-    errorKan1("%s\n","Unknown tag for extension.");
+	fprintf(stderr,"key=%s; ",key);
+    errorKan1("%s\n","Unknown key for extension.");
   }
 
 
   return(rob);
 }
 
+struct object KregionMatches(struct object sobj, struct object keyArray)
+{
+  struct object rob = OINIT;
+  int n,i,j,m,keyn;
+  char *s,*key;
+  rob = newObjectArray(3);
+  getoa(rob,0) = KpoInteger(-1);
+  getoa(rob,1) = NullObject;
+  getoa(rob,2) = NullObject;
+
+  if (sobj.tag != Sdollar) return rob;
+  if (keyArray.tag != Sarray) return rob;
+  n = getoaSize(keyArray);
+  for (i=0; i<n; i++) {
+	if (getoa(keyArray,i).tag != Sdollar) { return rob; }
+  }
+
+  s = KopString(sobj);
+  m = strlen(s);
+
+  for (i=0; i<n; i++) {
+	key = KopString(getoa(keyArray,i));
+	keyn = strlen(key);
+	for (j=0; j<m; j++) {
+	  if (strncmp(&(s[j]),key,keyn) == 0) {
+		getoa(rob,0) = KpoInteger(j);
+		getoa(rob,1) = KpoString(key);
+		getoa(rob,2) = KpoInteger(i);
+		return rob;
+	  }
+	}
+  }
+  return rob;
+}
+
+static struct object oregexec(struct object oregex,struct object ostrArray,struct object oflag) {
+  struct object rob = OINIT;
+  struct object ob = OINIT;
+  int n,i,j,m,keyn,cflag,eflag,er;
+  char *regex;
+  regex_t preg;
+  char *s;
+  char *mbuf; int mbufSize;
+#define REGMATCH_SIZE 100
+  regmatch_t pmatch[100]; size_t nmatch;
+  int size;
+
+  nmatch = (size_t) REGMATCH_SIZE;
+  rob = newObjectArray(0);
+  mbufSize = 1024;
+
+  if (oregex.tag != Sdollar) return rob;
+  if (ostrArray.tag != Sarray) return rob;
+  n = getoaSize(ostrArray);
+  for (i=0; i<n; i++) {
+    if (getoa(ostrArray,i).tag != Sdollar) { return rob; }
+  }
+  if (oflag.tag != Sarray) errorKan1("%s\n","oregexec: oflag should be an array of integers.");
+  cflag = eflag = 0;
+  oflag = Kto_int32(oflag);
+  for (i=0; i<getoaSize(oflag); i++) {
+    ob = getoa(oflag,i);
+    if (ob.tag != Sinteger) errorKan1("%s\n","oregexec: oflag is not an array of integers.");
+    if (i == 0) cflag = KopInteger(ob);
+    if (i == 1) eflag = KopInteger(ob);
+  }
+
+  regex = KopString(oregex);
+  if (er=regcomp(&preg,regex,cflag)) {
+    mbuf = (char *) sGC_malloc(mbufSize);
+    if (mbuf == NULL) errorKan1("%s\n","No more memory.");
+    regerror(er,&preg,mbuf,mbufSize-1);
+    errorKan1("regcomp error: %s\n",mbuf);
+  }
+
+  size = 0; /* We should use list instead of counting the size. */
+  for (i=0; i<n; i++) {
+    s = KopString(getoa(ostrArray,i));
+    er=regexec(&preg,s,nmatch,pmatch,eflag);
+    if ((er != 0) && (er != REG_NOMATCH)) { 
+      mbuf = (char *) sGC_malloc(mbufSize);
+      if (mbuf == NULL) errorKan1("%s\n","No more memory.");
+      regerror(er,&preg,mbuf,mbufSize-1);
+      errorKan1("regcomp error: %s\n",mbuf);
+    }
+    if (er == 0) size++;
+  }
+
+  rob = newObjectArray(size);
+  size = 0;
+  for (i=0; i<n; i++) {
+    s = KopString(getoa(ostrArray,i));
+    er=regexec(&preg,s,nmatch,pmatch,eflag);
+    if ((er != 0) && (er != REG_NOMATCH)) { 
+      mbuf = (char *) sGC_malloc(mbufSize);
+      if (mbuf == NULL) errorKan1("%s\n","No more memory.");
+      regerror(er,&preg,mbuf,mbufSize-1);
+      errorKan1("regcomp error: %s\n",mbuf);
+    }
+    if (er == 0) {
+      ob = newObjectArray(3);
+      putoa(ob,0,KpoString(s));
+      /* temporary */
+      putoa(ob,1,KpoInteger((int) (pmatch[0].rm_so)));
+      putoa(ob,2,KpoInteger((int) (pmatch[0].rm_eo)));
+      putoa(rob,size,ob);
+      size++;
+    }
+  }
+  regfree(&preg);
+  return rob;
+}