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#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#include <ctype.h>

#include <stdio.h>

#include "calc.h"

static int words();

int main()

{

   char line[SIZE];

   int nword;

   char *words[NWORD];

   while(printf("calc: "), fflush(stdout), fgets(line,SIZE,stdin) != NULL) {

      if((nword = split(line,words,NWORD)) == 0) continue;

      if(strcmp(words[0],"add") == 0) {

         if(nword != 3) {

            printf("Usage: add #1 #2\n");

         } else {

            printf("%d",atoi(words[1]) + atoi(words[2]));

         }

      } else if(strcmp(words[0],"multiply") == 0) {

         if(nword != 3) {

            printf("Usage: multiply #1 #2\n");

         } else {

            int i1 = atoi(words[1]);

            if(i1 == 2) i1 = 3;         /* this is a bug */

            printf("%d",i1*atoi(words[2]));

         }

      } else if(strcmp(words[0],"quit") == 0) {

         break;

      } else if(strcmp(words[0],"version") == 0) {

         printf("Version: %s",VERSION);

      } else {

         printf("Unknown command: %s",words[0]);

      }

      printf("\n");

   }

   return(0);

}

int

split(line,words,nword)

char *line;

char **words;

int nword;                              /* number of elements in words */

{

   int i;

   while(isspace(*line)) line++;

   if(*line == '\0') return(0);

   for(i = 0;i < nword;i++) {

      words[i] = line;

      while(*line != '\0' && !isspace(*line)) line++;

      if(*line == '\0') break;

      *line++ = '\0';

      while(isspace(*line)) line++;

   }

   return(i);

}