Thread: Need this program to skip leading whitespace using isspace()

I need function ParseStringFields() to skip leading white space in each delimited field created by the strtok function. I must use isspace() function. I am having a hard time with this? Help?

Thanks...

Code:

#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#define BUFSIZE 255
#define FILENAME "TestFile3.txt"

FILE *OpenFile(const char *fileName);
void ParseStringFields(FILE *fp);

int main(void)
{
   FILE *fp = OpenFile(FILENAME);
   ParseStringFields(fp);
   fclose(fp);
   return EXIT_SUCCESS;
}

FILE *OpenFile(const char *fileName)
{
   FILE *myFilePointer;
   if((myFilePointer = fopen(FILENAME, "r")) == NULL)
   {
      fprintf(stderr, "Can't open "FILENAME"\n");
      exit(EXIT_FAILURE);
   }
   else
      return(myFilePointer);

}

void ParseStringFields(FILE *fp)
{
   char *cp, buf[BUFSIZE];

   while (fgets(buf, (int)sizeof(buf), fp))
   {
      for(cp = buf; cp = strtok(cp, "AEIOUaeiou\n"); cp = NULL)
            puts(cp);
      puts(buf);
   }
}

I think it should be right before puts(cp) here:

Code:

      for(cp = buf; cp = strtok(cp, "AEIOUaeiou\n"); cp = NULL)
            puts(cp);
      puts(buf);

[

Sure....

strtok function tests each incoming char against a set of arbitrary delimiters (AEIOUaeiou\n), if said char is not one of these control falls to puts(cp). After it finds a delimiter it starts a new line, and begins printing char by char until it reaches another delimiter.

If at the beginning of a new line there is leading white space, my program must skip that white space. It must use the isspace function.

Now looking at my code it seems that the current for loop needs to be embedded in another loop which uses isspace to test char before control falls through to strtok function for loop?

Code:

void ParseStringFields(FILE *fp)
{
   char *cp, buf[BUFSIZE];
   int loopCounter;

   while (fgets(buf, (int)sizeof(buf), fp))
   {
      for(cp = buf; cp = strtok(cp, "AEIOUaeiou\n"); cp = NULL)
            puts(cp);
         puts(buf);
   }
}

Hmm...Now I am even more lost.

So that's not really at all what strtok does. You should read the manual again to see if that's what you want to do, or whether you really want to check each letter, or what.

puts doesn't really go letter by letter -- it prints a chunk of letters (from start to the end-of-string character).