File IO Help Please

[mlsbbe]

I want to read from the text file :

John,1,2,3,4
Smith,2,3,4,5
Jones,4,5,6,7

How would I detect an empty line in the file and tell the user that the line is missing? For example (the line with 'Smith' is empty probably due to a typo and I want to detect it and tell the user that the line is missing. Below is my code so far, though it doesn't seem to work. Can somebody help me please?

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#define MAXSTUDENT 40
#define MAXNAME 20
 
typedef struct{
char name[MAXNAME+1];
int ex1,ex2,ex3,ex4,average;
}student_t;


int main(void)
{                 
FILE *readfile;
char str_copy[40];
char str_name[MAXNAME+1];
char *p_str;
int i,index;                           

student_t s [MAXSTUDENT]; 


char *p_error;

                              
if((readfile=fopen("results.txt","rt"))==NULL)
{
printf("Error, unable to read file.  Program exiting");
return (1);
}else
 {
 
  
                 while((p_error=fgets(str_copy,sizeof(str_copy),readfile))!=NULL)
        
                {
                index=0;
                if((p_str=strchr(str_copy,'\n'))!=NULL)
                   
                   {
                   *p_str='\0';
                   printf("\nInput line OK");
                   } else
                        
                        {
                        printf("\nInput line too long for buffer\n"); 
                        exit(0);
                        }
                        
                index++;
                
                }
  

if (p_error==NULL)
  {  
  printf("\nYou have an empty line"); /*This tells user that there is an empty line*/

}

fclose(readfile);
return (0);
}

[Hammer]

>>How would I detect an empty line in the file
Depending on what you mean by empty, it maybe as simple as checking for a string length of 0. But what if the line constists of a few spaces, would you consider that empty too? If so, string length wouldn't help, you'd need to interegate the string itself.

>>and tell the user that the line is missing?
Err.. printf() ?

>>For example (the line with 'Smith' is empty probably due to a typo and I want to detect it and tell the user that the line is missing.
I'm not sure I understand, if the line is empty how do you know it was supposed to contain Smith's name and details?

[mlsbbe]

argg..sorry. Its probably because I only posted part of my code here.
I've just had this idea and I'll try work on it. Thankyou for the help .