iofun.c

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      /*==================================================*/
      /* Open a string input source using the characters  */
      /* retrieved from stdin and extract the first token */
      /* contained in the string.                         */
      /*==================================================*/

      OpenStringSource(theEnv,"read",inputString,0);
      GetToken(theEnv,"read",theToken);
      CloseStringSource(theEnv,"read");
      if (inputStringSize > 0) rm(theEnv,inputString,inputStringSize);

      /*===========================================*/
      /* Pressing control-c (or comparable action) */
      /* aborts the read function.                 */
      /*===========================================*/

      if (GetHaltExecution(theEnv))
        {
         theToken->type = STRING;
         theToken->value = (void *) EnvAddSymbol(theEnv,"*** READ ERROR ***");
        }

      /*====================================================*/
      /* Return the EOF symbol if the end of file for stdin */
      /* has been encountered. This typically won't occur,  */
      /* but is possible (for example by pressing control-d */
      /* in the UNIX operating system).                     */
      /*====================================================*/

      if ((theToken->type == STOP) && (inchar == EOF))
        {
         theToken->type = SYMBOL;
         theToken->value = (void *) EnvAddSymbol(theEnv,"EOF");
        }
     }
  }

/*************************************************************/
/* OpenFunction: H/L access routine for the open function.   */
/*************************************************************/
globle int OpenFunction(
  void *theEnv)
  {
   int numberOfArguments;
   char *fileName, *logicalName, *accessMode = NULL;
   DATA_OBJECT theArgument;

   /*========================================*/
   /* Check for a valid number of arguments. */
   /*========================================*/

   if ((numberOfArguments = EnvArgRangeCheck(theEnv,"open",2,3)) == -1) return(0);

   /*====================*/
   /* Get the file name. */
   /*====================*/

   if ((fileName = GetFileName(theEnv,"open",1)) == NULL) return(0);

   /*=======================================*/
   /* Get the logical name to be associated */
   /* with the opened file.                 */
   /*=======================================*/

   logicalName = GetLogicalName(theEnv,2,NULL);
   if (logicalName == NULL)
     {
      SetHaltExecution(theEnv,TRUE);
      SetEvaluationError(theEnv,TRUE);
      IllegalLogicalNameMessage(theEnv,"open");
      return(0);
     }

   /*==================================*/
   /* Check to see if the logical name */
   /* is already in use.               */
   /*==================================*/

   if (FindFile(theEnv,logicalName))
     {
      SetHaltExecution(theEnv,TRUE);
      SetEvaluationError(theEnv,TRUE);
      PrintErrorID(theEnv,"IOFUN",2,FALSE);
      EnvPrintRouter(theEnv,WERROR,"Logical name ");
      EnvPrintRouter(theEnv,WERROR,logicalName);
      EnvPrintRouter(theEnv,WERROR," already in use.\n");
      return(0);
     }

   /*===========================*/
   /* Get the file access mode. */
   /*===========================*/

   if (numberOfArguments == 2)
     { accessMode = "r"; }
   else if (numberOfArguments == 3)
     {
      if (EnvArgTypeCheck(theEnv,"open",3,STRING,&theArgument) == FALSE) return(0);
      accessMode = DOToString(theArgument);
     }

   /*=====================================*/
   /* Check for a valid file access mode. */
   /*=====================================*/

   if ((strcmp(accessMode,"r") != 0) &&
       (strcmp(accessMode,"r+") != 0) &&
       (strcmp(accessMode,"w") != 0) &&
       (strcmp(accessMode,"a") != 0) &&
       (strcmp(accessMode,"wb") != 0))
     {
      SetHaltExecution(theEnv,TRUE);
      SetEvaluationError(theEnv,TRUE);
      ExpectedTypeError1(theEnv,"open",3,"string with value \"r\", \"r+\", \"w\", \"wb\", or \"a\"");
      return(0);
     }

   /*================================================*/
   /* Open the named file and associate it with the  */
   /* specified logical name. Return TRUE if the     */
   /* file was opened successfully, otherwise FALSE. */
   /*================================================*/

   return(OpenAFile(theEnv,fileName,accessMode,logicalName));
  }

/***************************************************************/
/* CloseFunction: H/L access routine for the close function.   */
/***************************************************************/
globle int CloseFunction(
  void *theEnv)
  {
   int numberOfArguments;
   char *logicalName;

   /*======================================*/
   /* Check for valid number of arguments. */
   /*======================================*/

   if ((numberOfArguments = EnvArgCountCheck(theEnv,"close",NO_MORE_THAN,1)) == -1) return(0);

   /*=====================================================*/
   /* If no arguments are specified, then close all files */
   /* opened with the open command. Return TRUE if all    */
   /* files were closed successfully, otherwise FALSE.    */
   /*=====================================================*/

   if (numberOfArguments == 0) return(CloseAllFiles(theEnv));

   /*================================*/
   /* Get the logical name argument. */
   /*================================*/

   logicalName = GetLogicalName(theEnv,1,NULL);
   if (logicalName == NULL)
     {
      IllegalLogicalNameMessage(theEnv,"close");
      SetHaltExecution(theEnv,TRUE);
      SetEvaluationError(theEnv,TRUE);
      return(0);
     }

   /*========================================================*/
   /* Close the file associated with the specified logical   */
   /* name. Return TRUE if the file was closed successfully, */
   /* otherwise false.                                       */
   /*========================================================*/

   return(CloseFile(theEnv,logicalName));
  }

/***************************************/
/* GetCharFunction: H/L access routine */
/*   for the get-char function.        */
/***************************************/
globle int GetCharFunction(
  void *theEnv)
  {
   int numberOfArguments;
   char *logicalName;

   if ((numberOfArguments = EnvArgCountCheck(theEnv,"get-char",NO_MORE_THAN,1)) == -1)
     { return(-1); }

   if (numberOfArguments == 0 )
     { logicalName = "stdin"; }
   else
     {
      logicalName = GetLogicalName(theEnv,1,"stdin");
      if (logicalName == NULL)
        {
         IllegalLogicalNameMessage(theEnv,"get-char");
         SetHaltExecution(theEnv,TRUE);
         SetEvaluationError(theEnv,TRUE);
         return(-1);
        }
     }

   if (QueryRouters(theEnv,logicalName) == FALSE)
     {
      UnrecognizedRouterMessage(theEnv,logicalName);
      SetHaltExecution(theEnv,TRUE);
      SetEvaluationError(theEnv,TRUE);
      return(-1);
     }

   return(EnvGetcRouter(theEnv,logicalName));
  }

#endif

#if EXT_IO

/****************************************/
/* RemoveFunction: H/L access routine   */
/*   for the remove function.           */
/****************************************/
globle int RemoveFunction(
  void *theEnv)
  {
   char *theFileName;

   /*======================================*/
   /* Check for valid number of arguments. */
   /*======================================*/

   if (EnvArgCountCheck(theEnv,"remove",EXACTLY,1) == -1) return(FALSE);

   /*====================*/
   /* Get the file name. */
   /*====================*/

   if ((theFileName = GetFileName(theEnv,"remove",1)) == NULL) return(FALSE);

   /*==============================================*/
   /* Remove the file. Return TRUE if the file was */
   /* sucessfully removed, otherwise FALSE.        */
   /*==============================================*/

   return(genremove(theFileName));
  }

/****************************************/
/* RenameFunction: H/L access routine   */
/*   for the rename function.           */
/****************************************/
globle int RenameFunction(
  void *theEnv)
  {
   char *oldFileName, *newFileName;

   /*========================================*/
   /* Check for a valid number of arguments. */
   /*========================================*/

   if (EnvArgCountCheck(theEnv,"rename",EXACTLY,2) == -1) return(FALSE);

   /*===========================*/
   /* Check for the file names. */
   /*===========================*/

   if ((oldFileName = GetFileName(theEnv,"rename",1)) == NULL) return(FALSE);
   if ((newFileName = GetFileName(theEnv,"rename",2)) == NULL) return(FALSE);

   /*==============================================*/
   /* Rename the file. Return TRUE if the file was */
   /* sucessfully renamed, otherwise FALSE.        */
   /*==============================================*/

   return(genrename(oldFileName,newFileName));
  }

/****************************************/
/* FormatFunction: H/L access routine   */
/*   for the format function.           */
/****************************************/
globle void *FormatFunction(
  void *theEnv)
  {
   int argCount;
   unsigned start_pos;
   char *formatString, *logicalName;
   char formatFlagType;
   int  f_cur_arg = 3;
   unsigned form_pos = 0;
   char buffer[FORMAT_MAX];
   char percentBuffer[FLAG_MAX];
   char *fstr = NULL;
   unsigned fmaxm = 0;
   int fpos = 0;
   void *hptr;
   int longFound;
   char *theString;

   /*======================================*/
   /* Set default return value for errors. */
   /*======================================*/

   hptr = EnvAddSymbol(theEnv,"");

   /*=========================================*/
   /* Format requires at least two arguments: */
   /* a logical name and a format string.     */
   /*=========================================*/

   if ((argCount = EnvArgCountCheck(theEnv,"format",AT_LEAST,2)) == -1)
     { return(hptr); }

   /*========================================*/
   /* First argument must be a logical name. */
   /*========================================*/

   if ((logicalName = GetLogicalName(theEnv,1,"stdout")) == NULL)
     {
      IllegalLogicalNameMessage(theEnv,"format");
      SetHaltExecution(theEnv,TRUE);
      SetEvaluationError(theEnv,TRUE);
      return(hptr);
     }

   if (strcmp(logicalName,"nil") == 0)
     { /* do nothing */ }
   else if (QueryRouters(theEnv,logicalName) == FALSE)
     {
      UnrecognizedRouterMessage(theEnv,logicalName);
      return(hptr);
     }

   /*=====================================================*/
   /* Second argument must be a string.  The appropriate  */
   /* number of arguments specified by the string must be */
   /* present in the argument list.                       */
   /*=====================================================*/

   if ((formatString = ControlStringCheck(theEnv,argCount)) == NULL)
     { return (hptr); }

   /*==============================================*/
   /* Locate a string of 80 character for scanning */
   /* sub_string from control_string               */
   /*==============================================*/

   /* Scanning and print the format */

   while (formatString[form_pos] != '\0')
     {
      if (formatString[form_pos] != '%')
        {
         start_pos = form_pos;
         while ((formatString[form_pos] != '%') &&
                (formatString[form_pos] != '\0') &&
                ((form_pos - start_pos) < FLAG_MAX))
           { form_pos++; }
         fstr = AppendNToString(theEnv,&formatString[start_pos],fstr,form_pos-start_pos,&fpos,&fmaxm);
        }
      else
        {