===================================================================
RCS file: /home/cvs/OpenXM/src/kxx/ox_texmacs.c,v
retrieving revision 1.28
retrieving revision 1.43
diff -u -p -r1.28 -r1.43
--- OpenXM/src/kxx/ox_texmacs.c	2006/02/02 07:07:22	1.28
+++ OpenXM/src/kxx/ox_texmacs.c	2019/03/28 09:21:40	1.43
@@ -1,4 +1,4 @@
-/* $OpenXM: OpenXM/src/kxx/ox_texmacs.c,v 1.27 2006/02/01 04:16:54 takayama Exp $ */
+/* $OpenXM: OpenXM/src/kxx/ox_texmacs.c,v 1.42 2018/09/07 01:21:31 takayama Exp $ */
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -7,52 +7,73 @@
 #include <signal.h>
 #include "ox_kan.h"
 #include "serversm.h"
+#include "ox_pathfinder.h"
 
-#if defined(__CYGWIN__)
+#if defined(__CYGWIN__) || defined(__MSYS__)
 #define JMP_BUF sigjmp_buf
-#define SETJMP(env)  sigsetjmp(env,1)
-#define LONGJMP(env,p)  siglongjmp(env,p)
+#define SETJMP(env)  MYSIGSETJMP(env,1)
+#define LONGJMP(env,p)  MYSIGLONGJMP(env,p)
 #else
 #define JMP_BUF jmp_buf
-#define SETJMP(env)  setjmp(env)
-#define LONGJMP(env,p)  longjmp(env,p)
+#define SETJMP(env)  MYSETJMP(env)
+#define LONGJMP(env,p)  MYLONGJMP(env,p)
 #endif
 
 /*
 #define DEBUG 
 */
-/* #define DEBUG2 */
+/*
+#define DEBUG2
+*/
 
 /* Type of View part (user interface engine) */
 #define  GENERIC      0   /* DEBUG, xml */
 #define  V_TEXMACS    1
 #define  V_CFEP       2
+#define  V_QFEP       3
+#define  V_SAGE       4
+#define  V_JUPYTER       5
 int View       = V_TEXMACS ;
 
 char *Data_begin_v[] = {
   "<S type=verbatim>",
   "\002verbatim:",
   "\002",
+  "",
+  "",
+  ""
 };
 char *Data_begin_l[] = {
   "<S type=latex>",
   "\002latex:",
-  "\002latex:"
+  "\002latex:",
+  "",
+  "",
+  ""
 };
 char *Data_begin_p[] = {
   "<S type=prompt>",
   "\002prompt:",
-  "\002prompt:"
+  "\002prompt:",
+  "",
+  "",
+  ""
 };
 char *Data_begin_ps[] = {
   "<S type=postscript>",
   "\002ps:",
-  "\002ps:"
+  "\002ps:",
+  "",
+  "",
+  ""
 };
 char *Data_end[] = {
   "</S>",
   "\005",
-  "\n\005"    /* \n is not a part of the protocol. */
+  "\n\005",    /* \n is not a part of the protocol. */
+  "",
+  "",          /* SAGE */
+  "\n"
 };
 
 /* todo:  start_of_input */
@@ -60,9 +81,25 @@ char *Data_end[] = {
 char End_of_input[] = {
   0x5,              /* Use ^E and Return to end the input. */
   '\n',  /* TEXMACS_END_OF_INPUT. 0xd should be used for multiple lines. */
-  0x5    /* CFEP_END_OF_INPUT    */
+  0x5,    /* CFEP_END_OF_INPUT    */
+  0x5,
+  '\n',   /* SAGE cf. __init__ */
+  '\n'
 };
 
+/* Note! if you give more than 10 Views, increase the number 10  below. 
+   See the option --prompt which should be given after --view is set.
+*/
+char *Prompt[10]={
+  "generic>", /* generic */
+  "", /* texmacs */
+  "",    /* cfep */
+  "",   /* qfep */
+  "\nasir>",    /* SAGE */
+  "\nPEXPECT_PROMPT>"
+};
+
+
 /* Table for the engine type. */
 #define ASIR          1
 #define SM1           2
@@ -72,7 +109,7 @@ extern int Quiet;
 extern JMP_BUF EnvOfStackMachine;
 extern int Calling_ctrlC_hook;
 extern int RestrictedMode, RestrictedMode_saved;
-int Format=1;  /* 1 : latex mode */
+int Format=1;  /* 1 : latex mode, 2: cfep_png */
 int OutputLimit_for_TeXmacs = (1024*10);
 
 
@@ -87,6 +124,11 @@ int NoCopyright = 0;
 int Cpp = 0;                 /* Use cpp before sending to the engine. */ 
 int EngineLogToStdout = 0;   /* Do not run the ox engine inside xterm. */
 
+char *AsirInitFile = NULL;
+
+char *LanguageResource = NULL;
+int TM_quiet = 0;
+
 void ctrlC();
 struct object KpoString(char *s);
 char *KSpopString(void);
@@ -101,6 +143,8 @@ static int startEngine(int type,char *msg);
 static int isPS(char *s);
 static int end_of_input(int c);
 static void setDefaultParameterForCfep();
+static void setDefaultParameterForSage();
+static void setDefaultParameterForJupyter();
 
 static void myEncoder(int c);
 static void myEncoderS(unsigned char *s);
@@ -108,6 +152,13 @@ static void myEncoderSn(unsigned char *s,int n);
 static void outputStringToTunnel0(int channel, unsigned char *s, int size, int view);
 static void outputStringToTunnel(int channel, unsigned char *s,  int view);
 
+static void pngSendFile(char *path);
+static int pngCheck(void);
+static void pngNotAvailable(void);
+static char *pngGetResult();
+
+static void flushSm1();
+
 /* tail -f /tmp/debug-texmacs.txt 
    Debug output to understand the timing problem of pipe interface.
 */
@@ -122,6 +173,7 @@ main(int argc,char *argv[]) {
   int vmode=1;
   char *openxm_home;
   char *asir_config;
+  char *path;
   int i;
 
 
@@ -129,7 +181,19 @@ main(int argc,char *argv[]) {
 #ifdef DEBUG2
   Dfp = fopen("/tmp/debug-texmacs.txt","w");
 #endif
-  
+
+  TM_quiet=0;
+  for (i=1; i<argc; i++) {
+    if (strcmp(argv[i],"--quiet")==0) {
+      TM_quiet=1;
+    }
+  }
+  /* Initialize kanlib (gc is also initialized) */
+  if (TM_quiet) {
+    KSstart_quiet();
+  }else{
+    KSstart();
+  }
   /* Set consts */
   Quiet = 1;
   for (i=1; i<argc; i++) {
@@ -139,6 +203,12 @@ main(int argc,char *argv[]) {
         View = V_TEXMACS;
       }else if (strcmp(argv[i],"cfep")==0) {
         View = V_CFEP; setDefaultParameterForCfep();
+      }else if (strcmp(argv[i],"qfep")==0) {
+	View = V_QFEP; setDefaultParameterForCfep();
+      }else if (strcmp(argv[i],"sage")==0) {
+	View = V_SAGE; setDefaultParameterForSage();
+      }else if (strcmp(argv[i],"jupyter")==0) {
+	View = V_JUPYTER; setDefaultParameterForJupyter();
       }else{
         View = GENERIC;
         /* printv("Unknown view type.\n"); */
@@ -160,6 +230,21 @@ main(int argc,char *argv[]) {
       Cpp = 1;
     }else if (strcmp(argv[i],"--engineLogToStdout") == 0) {
       EngineLogToStdout = 1;
+    }else if (strcmp(argv[i],"--languageResource") == 0) {
+      i++;
+      LanguageResource = (char *)sGC_malloc(strlen(argv[i])+80);
+      sprintf(LanguageResource,
+			  " /localizedString.file (%s) def localizedString.load ",argv[i]);
+    }else if (strcmp(argv[i],"--asirInitFile") == 0) {
+      i++;
+      AsirInitFile = (char *)sGC_malloc(strlen(argv[i])+80);
+      sprintf(AsirInitFile,"%s",argv[i]);
+    }else if (strcmp(argv[i],"--quiet") == 0) {
+      /* it is already set. Ignore. */
+    }else if (strcmp(argv[i],"--prompt")==0) {
+      i++;
+      Prompt[View] = (char *)sGC_malloc(strlen(argv[i])+2);
+      strcpy(Prompt[View],argv[i]);
     }else{
       /* printv("Unknown option\n"); */
     }
@@ -172,8 +257,6 @@ main(int argc,char *argv[]) {
     exit(10);
   }
 
-  /* Initialize kanlib (gc is also initialized) */
-  KSstart();
 
   /* Main loop */
   printf("%s",Data_begin_v[View]);
@@ -190,10 +273,11 @@ main(int argc,char *argv[]) {
   KSexecuteString(" [(parse) (ox.sm1) pushfile] extension ");
   if (Xm_noX) KSexecuteString(" /Xm_noX 1 def ");
   if (EngineLogToStdout) KSexecuteString(" /Xm_engineLogToStdout 1 def ");
+  if (LanguageResource != NULL) KSexecuteString(LanguageResource);
   startEngine(TM_Engine," ");
 
-  if (signal(SIGINT,SIG_IGN) != SIG_IGN) {
-    signal(SIGINT,ctrlC);
+  if (mysignal(SIGINT,SIG_IGN) != SIG_IGN) {
+    mysignal(SIGINT,ctrlC);
   }
 
   irt = 0;
@@ -206,18 +290,24 @@ main(int argc,char *argv[]) {
         RestrictedMode = RestrictedMode_saved;
       }
       Calling_ctrlC_hook = 0; 
-      if (signal(SIGINT,SIG_IGN) != SIG_IGN) {
-        signal(SIGINT,ctrlC);
+      if (mysignal(SIGINT,SIG_IGN) != SIG_IGN) {
+        mysignal(SIGINT,ctrlC);
       }
       irt = 1;
       continue;
     } else {  }
     if (!irt) {
-      printf("%s",Data_end[View]); fflush(stdout);
+      if (View != V_SAGE) printf("%s",Data_end[View]); fflush(stdout);
     }
     irt = 0;
 
     /* Reading the input. */
+    if ((View == V_SAGE) || (View == V_JUPYTER)) {
+      if (s != NULL) {printf("%s",Prompt[View]); fflush(stdout);}
+      else {printf("%s",&(Prompt[View][1])); fflush(stdout);}
+    }else{
+      printf("%s",Prompt[View]); fflush(stdout);
+    }
     if (TM_Engine == K0) {
       s=readString(stdin, " ", " "); /* see test data */
     }else if (TM_Engine == SM1) {
@@ -234,6 +324,8 @@ main(int argc,char *argv[]) {
     ob = KpoString(s);  
     KSpush(ob);
     KSexecuteString(" oxsubmit ");
+
+	if (TM_Engine == SM1) flushSm1();
     
     /* Get the result in string for cfep. */
     if (View != V_TEXMACS) {
@@ -249,8 +341,12 @@ main(int argc,char *argv[]) {
         }
       }
       if (!TM_do_not_print) {
-        KSexecuteString(" ox.engine oxpopstring ");
-        r = KSpopString();
+        if (Format == 2) { /* png mode */
+          r = pngGetResult();
+        }else{
+          KSexecuteString(" ox.engine oxpopstring ");
+          r = KSpopString();
+        }
         printv(r);
       }else{
         KSexecuteString(" ox.engine 1 oxpops ");
@@ -261,7 +357,7 @@ main(int argc,char *argv[]) {
       continue;
     }
     /* Get the result in string for texmacs  */
-    if (Format == 1 && (! TM_do_not_print)) {
+    if ((Format == 1) && (! TM_do_not_print)) {
       /* translate to latex form */
       KSexecuteString(" ox.engine oxpushcmotag ox.engine oxpopcmo ");
       ob = KSpop();
@@ -312,6 +408,41 @@ main(int argc,char *argv[]) {
   }
 }
 
+static char *pngGetResult(void) {
+  struct object ob;
+  int vmode;
+  char *r;
+  char *path;
+
+  /* translate to latex form */
+  KSexecuteString(" ox.engine oxpushcmotag ox.engine oxpopcmo ");
+  ob = KSpop();
+  vmode = 0;
+  /* printf("id=%d\n",ob.tag); bug: matrix return 17 instead of Sinteger
+     or error. */
+  if (ob.tag == Sinteger) {
+    /* printf("cmotag=%d\n",ob.lc.ival);*/
+    if (ob.lc.ival == CMO_ERROR2) {
+      vmode = 1;
+    }
+    if (ob.lc.ival == CMO_STRING) {
+      vmode = 1;
+    }
+  }
+  if (vmode) {
+    KSexecuteString(" ox.engine oxpopstring ");
+    r = KSpopString();
+  }else{
+    KSexecuteString(" ox.engine 1 oxpushcmo ox.engine (print_png_form2) oxexec  ");
+    KSexecuteString(" ox.engine oxpopcmo /tmp_ox_texmacs set tmp_ox_texmacs 0 get ");
+    r = KSpopString();  /* input form */
+    KSexecuteString(" tmp_ox_texmacs 1 get ");
+    path = KSpopString(); /* path name of the png file. */
+    pngSendFile(path);
+  }
+  return r;
+}
+
 #define SB_SIZE 1024
 #define INC_BUF     if (n >= limit-3) { \
       tmp = s; \
@@ -324,6 +455,9 @@ main(int argc,char *argv[]) {
       strcpy(s,tmp); \
     } 
 /*   */
+static char *Sss=NULL;
+static int Sss_size=10240;
+
 static char *readString(FILE *fp, char *prolog, char *epilog) {
   int n = 0;
   static int limit = 0;
@@ -350,17 +484,22 @@ static char *readString(FILE *fp, char *prolog, char *
   start = n;
   while ((c = fgetc(fp)) != EOF) {
 #ifdef DEBUG2
-    fprintf(Dfp,"[%x] ",c); fflush(Dfp); 
+    fprintf(Dfp,"[%x]%c ",c,c); fflush(Dfp); 
 #endif
     if (end_of_input(c)) {
       /* If there remains data in the stream,
          read the remaining data. (for debug) */
-	  /*
-      if (oxSocketSelect0(0,1)) {
-        if (c == '\n') c=' ';
-        s[n++] = c; s[n] = 0;  m++;
-        INC_BUF ;
-        continue;
+      /*
+      if ((View == V_JUPYTER) || (View == V_SAGE)) {
+        if (oxSocketSelect0(0,1)) {
+#ifdef DEBUG2
+          fprintf(Dfp,"<%x>%c ",c,c); fflush(Dfp); 
+#endif
+          if (c == '\n') c=' ';
+          s[n++] = c; s[n] = 0;  m++;
+          INC_BUF ;
+          continue;
+        }
       }
       */
       break;
@@ -369,14 +508,25 @@ static char *readString(FILE *fp, char *prolog, char *
     s[n++] = c; s[n] = 0;  m++;
     INC_BUF ;
   }
+  if ((c == EOF) && (start == n)) exit(0); 
   /* Check the escape sequence */
   if (strcmp(&(s[start]),"!quit;") == 0) {
     printv("Terminated the process ox_texmacs.\n"); 
     exit(0);
   }
+  if (((View == V_JUPYTER) || (View == V_SAGE)) && 
+      ((strcmp(&(s[start]),"quit")==0) || (strcmp(&(s[start]),"quit()")==0))) {
+    printv("Terminated the process ox_texmacs.\n"); 
+    exit(0);
+  }
+  if ((View == V_JUPYTER) && 
+      (strcmp(&(s[start]),"version")==0)) {
+    s[n=strlen(s)]='('; s[++n]=0; INC_BUF;
+    s[n++]=')'; s[n]=0; INC_BUF;
+  }
   /* Check the escape sequence to change the global env. */
   if (strcmp(&(s[start]),"!verbatim;") == 0) {
-    printv("Output mode is changed to verbatim mode.");
+    if (View != V_CFEP) printv("Output mode is changed to verbatim mode.");
     Format=0;
     return NULL;
   }
@@ -385,6 +535,13 @@ static char *readString(FILE *fp, char *prolog, char *
     Format = 1;
     return NULL;
   }
+  if (strcmp(&(s[start]),"!cfep_png;") == 0) {
+	if (pngCheck()) {
+	  if (View != V_CFEP) printv("Output mode is changed to cfep_png/verbose.");
+      Format = 2;
+    } else pngNotAvailable();
+    return NULL;
+  }
   if (strcmp(&(s[start]),"!asir;") == 0) {
     Format=1;
     TM_Engine=ASIR; startEngine(TM_Engine,"Asir");
@@ -408,6 +565,55 @@ static char *readString(FILE *fp, char *prolog, char *
     return NULL;
   }
 
+  /* remove end$ or end; */
+  if (TM_Engine == ASIR) {
+    for (i=n-1; i>=4; i--) {
+	  if ((s[i-4]=='\n') && (s[i-3]=='e') && (s[i-2]=='n') && (s[i-1]=='d') && (s[i]=='$')) {
+        s[i-3] = s[i-2] = s[i-1] = s[i] = ' '; break;
+      }
+	  if ((s[i-4]=='\n') && (s[i-3]=='e') && (s[i-2]=='n') && (s[i-1]=='d') && (s[i]==';')) {
+        s[i-3] = s[i-2] = s[i-1] = s[i] = ' '; break;
+      }
+    }
+
+    /* 2019.03.28 for jupyter */
+    if ((strncmp(&(s[start]),"base_prompt",strlen("base_prompt")) != 0)
+        &&(strncmp(&(s[start]),"version()",strlen("version()")) != 0)) {
+      if (Sss == NULL) {
+          Sss = (char *)sGC_malloc(Sss_size);
+          Sss[0] = 0;
+      }
+      if (Sss_size < strlen(Sss)+strlen(s)+strlen(epilog)-10) {
+        Sss_size = 2*Sss_size;
+        if (Sss_size < 0) { fprintf(stderr,"Fatal error: too big string\n"); exit(-1); }	
+        char *sss_tmp = (char *)sGC_malloc(Sss_size);
+	strcpy(sss_tmp,Sss);
+        Sss=sss_tmp;
+      }
+      strcpy(&(Sss[strlen(Sss)]),&(s[start]));
+      for (i=strlen(Sss); i>=0; i--) {
+	if (Sss[i] < 0x20) continue;
+        if (Sss[i] == '#') {
+          /* construct s and return s */
+          Sss[i] = ' ';
+          s = (char *) sGC_malloc(strlen(Sss)+strlen(prolog)+strlen(epilog)+10);
+          sprintf(s,"%s%s%s",prolog,Sss,epilog);
+          Sss[0]=0;
+#ifdef DEBUG2
+          fprintf(Dfp,"#By Sss: %s#\n",s); fflush(Dfp);
+#endif
+          return s;
+        }else break;
+      }
+      return NULL;
+    }
+  }else{
+#ifdef DEBUG2
+    fprintf(Dfp,"#base_prompt or version()#\n",s); fflush(Dfp);
+#endif
+  }
+  /* end 2019.03.28 for jupyter. */
+
   /* Set TM_do_no_print */
   if (s[n-1] == '$' && TM_Engine == ASIR) {
 	TM_do_not_print = 1; s[n-1] = ' ';
@@ -430,6 +636,12 @@ static int end_of_input(int c) {
 static void setDefaultParameterForCfep() {
   Format = 0;
 }
+static void setDefaultParameterForSage() {
+  Format = 0;
+}
+static void setDefaultParameterForJupyter() {
+  Format = 0;
+}
 
 static void printv(char *s) {
   int i;
@@ -468,20 +680,23 @@ static void printp(char *s) {
   fflush(NULL);
 }
 static void printCopyright(char *s) {
-  printf("%s",Data_begin_v[View]);
   if (! NoCopyright) {
+    printf("%s",Data_begin_v[View]);
     printf("OpenXM engine (ox engine) interface with TeXmacs protocol.\n2004 (C) openxm.org");
     printf(" under the BSD license.  !asir; !sm1; !k0; !verbatim; !quit;\n");
     printf("Type in      !reset;     when the engine gets confused. ");
     printf("%s",s);
+    printf("%s",Data_end[View]);
   }
-  printf("%s",Data_end[View]);
   fflush(NULL);
 }
 
+static void flushSm1() {
+  KSexecuteString(" oxsm1.ccc ( [(flush)] extension pop ) oxsubmit ");
+}
 static int startEngine(int type,char *msg) {
   struct object ob = OINIT;
-  printf("%s",Data_begin_v[View]);
+  if (!TM_quiet) printf("%s",Data_begin_v[View]);
   if (type == SM1) {
     if (!TM_sm1Started) KSexecuteString(" sm1connectr ");
     KSexecuteString(" /ox.engine oxsm1.ccc def ");
@@ -489,6 +704,7 @@ static int startEngine(int type,char *msg) {
     KSexecuteString("  oxsm1.ccc ( [(cmoLispLike) 0] extension ) oxsubmit ");
     KSexecuteString("  oxsm1.ccc ( ox_server_mode ) oxsubmit ");
     KSexecuteString("  oxsm1.ccc ( ( ) message (------------- Message from sm1 ----------------)message ) oxsubmit ");
+	flushSm1();
     TM_sm1Started = 1;
 	/* Welcome message.  BUG. Copyright should be returned by a function. */
     if (! NoCopyright) {
@@ -498,7 +714,7 @@ static int startEngine(int type,char *msg) {
       printf("Info: http://www.math.kobe-u.ac.jp/KAN, kan@math.kobe-u.ac.jp.\n");
       printf("0 usages to show a list of functions. \n(keyword) usages to see a short description\n");
     }
-    printf("%s\n",msg);
+    printf("%s\n",msg); fflush(NULL);
   }else if (type == K0) {
     if (!TM_k0Started) KSexecuteString(" k0connectr ");
     KSexecuteString(" /ox.engine oxk0.ccc def ");
@@ -523,13 +739,20 @@ static int startEngine(int type,char *msg) {
       }
     }
     /* Initialize the setting of asir. */
-    KSexecuteString(" oxasir.ccc (if(1) {  Xm_server_mode = 1; Xm_helpdir = \"help-eg\";  } else { ; } ;) oxsubmit oxasir.ccc oxpopcmo ");
+    if (AsirInitFile) {  /* cf. asir-contrib/packages/src/cfep-init.rr */
+	  unsigned char *ss;
+	  ss = (unsigned char *)sGC_malloc(strlen(AsirInitFile)+256);
+	  sprintf((char *)ss," oxasir.ccc (load(\"%s\");) oxsubmit oxasir.ccc oxgeterrors length 0 gt { (Error in loading asirInitFile) message} { } ifelse ",AsirInitFile);
+	  /* printf("Loading --asirInitFile %s\n",AsirInitFile); */
+	  KSexecuteString(ss);
+    }
+    KSexecuteString(" oxasir.ccc (if(1) {  Xm_server_mode = 1; Xm_helpdir = \"help-en\";  } else { ; } ;) oxsubmit oxasir.ccc oxpopcmo ");
     KSexecuteString(" oxasir.ccc (if(1) {  ctrl(\"message\",0);  } else { ; } ;) oxsubmit oxasir.ccc oxpopcmo ");
     /* bug; if ctrl is written with Xm_helpdir = ... without oxpopcmo, then it does
        not work. */
     KSexecuteString(" oxasir.ccc (print(\"----------- Messages from asir ------------------------------\")$ ) oxsubmit oxasir.ccc oxpopcmo ");
   }
-  printf("%s",Data_end[View]);
+  if (!TM_quiet) printf("%s",Data_end[View]);
   fflush(NULL);
 }
 
@@ -554,7 +777,7 @@ static void myEncoder(int c) {
 }
 static void myEncoderS(unsigned char *s) {
   int i,n;
-  n = strlen(s);
+  n = strlen((char *)s);
   for (i = 0; i<n ; i++) myEncoder(s[i]);
 }
 static void myEncoderSn(unsigned char *s,int n) {
@@ -569,10 +792,10 @@ static void outputStringToTunnel0(int channel, unsigne
     for (i=0; i<n; i++) putchar(s[i]);
     printf("%c>}",0);
   }else if (view == V_CFEP) {
-    sprintf(ts,"{%d<%d ",channel,n+1);
+    sprintf((char *)ts,"{%d<%d ",channel,n+1);
     myEncoderS(ts);
     myEncoderSn(s,n); myEncoder(0); 
-    myEncoderS(">}");
+    myEncoderS((unsigned char *)">}");
   }
   fflush(stdout);
 }
@@ -590,5 +813,26 @@ static void outputStringToTunnel(int channel, unsigned
 }
 
 
-
+static void pngSendFile(char *path) {
+  char s[1024];
+  if (strlen(path) > 1000) return;
+  sprintf(s,"showFile,%s",path);
+  outputStringToTunnel0(10,(unsigned char *)s,strlen(s),View);
+  printf("\n");
+  fflush(NULL);
+}
+static int pngCheck(void) {
+  static int checked = 0;
+  static int ans = 0;
+  if (checked) return ans;
+  checked = 1;
+  if (!getCommandPath("latex")) return 0;
+  if (!getCommandPath("dvipng")) return 0;
+  ans = 1;  return 1;
+}
+static void pngNotAvailable(void) {
+  char *s = "notAvailable";
+  outputStringToTunnel0(10,(unsigned char *)s,strlen(s),View);
+  fflush(NULL);
+}