strngfun.c

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  DATA_OBJECT_PTR returnValue)
  {
   DATA_OBJECT theArg;
   unsigned i;
   size_t slen;
   char *osptr, *nsptr;

   /*================================================*/
   /* Function lowcase expects exactly one argument. */
   /*================================================*/

   if (EnvArgCountCheck(theEnv,"lowcase",EXACTLY,1) == -1)
     {
      SetpType(returnValue,STRING);
      SetpValue(returnValue,(void *) EnvAddSymbol(theEnv,""));
      return;
     }

   /*==================================================*/
   /* The argument should be of type symbol or string. */
   /*==================================================*/

   if (EnvArgTypeCheck(theEnv,"lowcase",1,SYMBOL_OR_STRING,&theArg) == FALSE)
     {
      SetpType(returnValue,STRING);
      SetpValue(returnValue,(void *) EnvAddSymbol(theEnv,""));
      return;
     }

   /*======================================================*/
   /* Allocate temporary memory and then copy the original */
   /* string or symbol to that memory, while lowercasing   */
   /* upper case alphabetic characters.                    */
   /*======================================================*/

   osptr = DOToString(theArg);
   slen = strlen(osptr) + 1;
   nsptr = (char *) gm2(theEnv,slen);

   for (i = 0  ; i < slen ; i++)
     {
      if (isupper(osptr[i]))
        { nsptr[i] = (char) tolower(osptr[i]); }
      else
        { nsptr[i] = osptr[i]; }
     }

   /*========================================*/
   /* Return the lowercased string and clean */
   /* up the temporary memory used.          */
   /*========================================*/

   SetpType(returnValue,GetType(theArg));
   SetpValue(returnValue,(void *) EnvAddSymbol(theEnv,nsptr));
   rm(theEnv,nsptr,slen);
  }

/********************************************/
/* StrCompareFunction: H/L access routine   */
/*   for the str-compare function.          */
/********************************************/
globle long int StrCompareFunction(
  void *theEnv)
  {
   int numArgs, length;
   DATA_OBJECT arg1, arg2, arg3;
   long returnValue;

   /*=======================================================*/
   /* Function str-compare expects either 2 or 3 arguments. */
   /*=======================================================*/

   if ((numArgs = EnvArgRangeCheck(theEnv,"str-compare",2,3)) == -1) return(0L);

   /*=============================================================*/
   /* The first two arguments should be of type symbol or string. */
   /*=============================================================*/

   if (EnvArgTypeCheck(theEnv,"str-compare",1,SYMBOL_OR_STRING,&arg1) == FALSE)
     { return(0L); }

   if (EnvArgTypeCheck(theEnv,"str-compare",2,SYMBOL_OR_STRING,&arg2) == FALSE)
     { return(0L); }

   /*===================================================*/
   /* Compare the strings. Use the 3rd argument for the */
   /* maximum length of comparison, if it is provided.  */
   /*===================================================*/

   if (numArgs == 3)
     {
      if (EnvArgTypeCheck(theEnv,"str-compare",3,INTEGER,&arg3) == FALSE)
        { return(0L); }

      length = CoerceToInteger(GetType(arg3),GetValue(arg3));
      returnValue = strncmp(DOToString(arg1),DOToString(arg2),
                            (STD_SIZE) length);
     }
   else
     { returnValue = strcmp(DOToString(arg1),DOToString(arg2)); }

   /*========================================================*/
   /* Return Values are as follows:                          */
   /* -1 is returned if <string-1> is less than <string-2>.  */
   /*  1 is return if <string-1> is greater than <string-2>. */
   /*  0 is returned if <string-1> is equal to <string-2>.   */
   /*========================================================*/

   if (returnValue < 0) returnValue = -1;
   else if (returnValue > 0) returnValue = 1;
   return(returnValue);
  }

/*******************************************/
/* SubStringFunction: H/L access routine   */
/*   for the sub-string function.          */
/*******************************************/
globle void *SubStringFunction(
  void *theEnv)
  {
   DATA_OBJECT theArgument;
   char *tempString, *returnString;
   int start, end, i, j;
   void *returnValue;

   /*===================================*/
   /* Check and retrieve the arguments. */
   /*===================================*/

   if (EnvArgCountCheck(theEnv,"sub-string",EXACTLY,3) == -1)
     { return((void *) EnvAddSymbol(theEnv,"")); }

   if (EnvArgTypeCheck(theEnv,"sub-string",1,INTEGER,&theArgument) == FALSE)
     { return((void *) EnvAddSymbol(theEnv,"")); }

   start = CoerceToInteger(theArgument.type,theArgument.value) - 1;

   if (EnvArgTypeCheck(theEnv,"sub-string",2,INTEGER,&theArgument) == FALSE)
     {  return((void *) EnvAddSymbol(theEnv,"")); }

   end = CoerceToInteger(theArgument.type,theArgument.value) - 1;

   if (EnvArgTypeCheck(theEnv,"sub-string",3,SYMBOL_OR_STRING,&theArgument) == FALSE)
     { return((void *) EnvAddSymbol(theEnv,"")); }

   /*================================================*/
   /* If parameters are out of range return an error */
   /*================================================*/

   if (start < 0) start = 0;
   if (end > (int) strlen(DOToString(theArgument)))
     { end = (int) strlen(DOToString(theArgument)); }

   /*==================================*/
   /* If the start is greater than the */
   /* end, return a null string.       */
   /*==================================*/

   if (start > end)
     { return((void *) EnvAddSymbol(theEnv,"")); }

   /*=============================================*/
   /* Otherwise, allocate the string and copy the */
   /* designated portion of the old string to the */
   /* new string.                                 */
   /*=============================================*/

   else
     {
      returnString = (char *) gm2(theEnv,(unsigned) (end - start + 2));  /* (end - start) inclusive + EOS */
      tempString = DOToString(theArgument);
      for(j=0, i=start;i <= end; i++, j++)
        { *(returnString+j) = *(tempString+i); }
      *(returnString+j) = '\0';
     }

   /*========================*/
   /* Return the new string. */
   /*========================*/

   returnValue = (void *) EnvAddSymbol(theEnv,returnString);
   rm(theEnv,returnString,(unsigned) (end - start + 2));
   return(returnValue);
  }

/******************************************/
/* StrIndexFunction: H/L access routine   */
/*   for the sub-index function.          */
/******************************************/
globle void StrIndexFunction(
  void *theEnv,
  DATA_OBJECT_PTR result)
  {
   DATA_OBJECT theArgument1, theArgument2;
   char *strg1, *strg2;
   int i, j;

   result->type = SYMBOL;
   result->value = EnvFalseSymbol(theEnv);

   /*===================================*/
   /* Check and retrieve the arguments. */
   /*===================================*/

   if (EnvArgCountCheck(theEnv,"str-index",EXACTLY,2) == -1) return;

   if (EnvArgTypeCheck(theEnv,"str-index",1,SYMBOL_OR_STRING,&theArgument1) == FALSE) return;

   if (EnvArgTypeCheck(theEnv,"str-index",2,SYMBOL_OR_STRING,&theArgument2) == FALSE) return;

   strg1 = DOToString(theArgument1);
   strg2 = DOToString(theArgument2);

   /*=================================*/
   /* Find the position in string2 of */
   /* string1 (counting from 1).      */
   /*=================================*/

   if (strlen(strg1) == 0)
     {
      result->type = INTEGER;
      result->value = (void *) EnvAddLong(theEnv,(long) strlen(strg2) + 1L);
      return;
     }

   for (i=1; *strg2; i++, strg2++)
     {
      for (j=0; *(strg1+j) && *(strg1+j) == *(strg2+j); j++)
        { /* Do Nothing */ }

      if (*(strg1+j) == '\0')
        {
         result->type = INTEGER;
         result->value = (void *) EnvAddLong(theEnv,(long) i);
         return;
        }
     }

   return;
  }

/********************************************/
/* StringToFieldFunction: H/L access routine */
/*   for the string-to-field function.       */
/********************************************/
globle void StringToFieldFunction(
  void *theEnv,
  DATA_OBJECT *returnValue)
  {
   DATA_OBJECT theArg;

   /*========================================================*/
   /* Function string-to-field expects exactly one argument. */
   /*========================================================*/

   if (EnvArgCountCheck(theEnv,"string-to-field",EXACTLY,1) == -1)
     {
      returnValue->type = STRING;
      returnValue->value = (void *) EnvAddSymbol(theEnv,"*** ERROR ***");
      return;
     }

   /*==================================================*/
   /* The argument should be of type symbol or string. */
   /*==================================================*/

   if (EnvArgTypeCheck(theEnv,"string-to-field",1,SYMBOL_OR_STRING,&theArg) == FALSE)
     {
      returnValue->type = STRING;
      returnValue->value = (void *) EnvAddSymbol(theEnv,"*** ERROR ***");
      return;
     }

   /*================================*/
   /* Convert the string to an atom. */
   /*================================*/

   StringToField(theEnv,DOToString(theArg),returnValue);
  }

/*************************************************************/
/* StringToField: Converts a string to an atomic data value. */
/*************************************************************/
globle void StringToField(
  void *theEnv,
  char *theString,
  DATA_OBJECT *returnValue)
  {
   struct token theToken;

   /*====================================*/
   /* Open the string as an input source */
   /* and retrieve the first value.      */
   /*====================================*/

   OpenStringSource(theEnv,"string-to-field-str",theString,0);
   GetToken(theEnv,"string-to-field-str",&theToken);
   CloseStringSource(theEnv,"string-to-field-str");

   /*====================================================*/
   /* Copy the token to the return value data structure. */
   /*====================================================*/

   returnValue->type = theToken.type;
   if ((theToken.type == FLOAT) || (theToken.type == STRING) ||
#if OBJECT_SYSTEM
       (theToken.type == INSTANCE_NAME) ||
#endif
       (theToken.type == SYMBOL) || (theToken.type == INTEGER))
     { returnValue->value = theToken.value; }
   else if (theToken.type == STOP)
     {
      returnValue->type = SYMBOL;
      returnValue->value = (void *) EnvAddSymbol(theEnv,"EOF");
     }
   else if (theToken.type == UNKNOWN_VALUE)
     {
      returnValue->type = STRING;
      returnValue->value = (void *) EnvAddSymbol(theEnv,"*** ERROR ***");
     }
   else
     {
      returnValue->type = STRING;
      returnValue->value = (void *) EnvAddSymbol(theEnv,theToken.printForm);
     }
  }
  
#if (! RUN_TIME) && (! BLOAD_ONLY)

/**************************************/
/* EvalFunction: H/L access routine   */
/*   for the eval function.           */
/**************************************/
globle void EvalFunction(
  void *theEnv,
  DATA_OBJECT_PTR returnValue)
  {
   DATA_OBJECT theArg;

   /*=============================================*/