Thread: Fgets problem again

Hi

I wasnt sure if I should continue to post in the previous thread, but I overlooked a specification, and I couldnt get it to work with this.

I was using the suggestion if line[0] = '.' to stop reading, but that doesnt work if there is text after it. (ie. .blah blah blah), it wouldnt read the blah blah blah.

I should, however, stop reading when there is a period is on a line by itself, as the first character.

Also, if there is a period to begin the line, I have to add a period to the beginning of the line.

I know I can prepend the period with strcat, but Im not sure how to structure the while loop.

Any suggestions would again be appreciated.

Thanks

(that is how the file looks, with records as below)
Date: Feb 20, 2004
Requestor: Paul
Email: [email protected]
Priority: Medium
Needed: now
Status: ok
Description:
Test here.
.

An idea.

Code:

/* test.txt
Date: Feb 20, 2004
Requestor: Paul
Email: [email protected]
Priority: Medium
Needed: now
Status: ok
Description:
Test here.
.
Date: Feb 20, 2004
Requestor: Paul
Email: [email protected]
Priority: Medium
Needed: now
Status: ok
Description:
Test here.
And here.
And here.
.
*/
#include <stdio.h>

struct record
{
   char  date        [ BUFSIZ ],
         requestor   [ BUFSIZ ],
         email       [ BUFSIZ ],
         priority    [ BUFSIZ ],
         needed      [ BUFSIZ ],
         status      [ BUFSIZ ],
         description [ BUFSIZ ];
};

int foo(FILE *file, char *dst, size_t size)
{
   size_t i;
   for ( i = 0; i < size; ++i )
   {
      int ch = fgetc(file);
      if ( ch == EOF )
      {
         return 0;
      }
      dst[i] = ch;
      if ( i > 2 && dst[i - 3] == '.' && dst[i - 2] == '\n' &&
           dst[i - 1] == '.' && dst[  i  ] == '\n' )
      {
         break;
      }
   }
   dst[i - 1] = '\0';
   return 1;
}

int main(void)
{
   const char filename[] = "test.txt";
   FILE *file = fopen(filename, "r");
   if ( file )
   {
      struct record record;
      const char format[] = "Date: %[^\n]%*c"
                            "Requestor: %[^\n]%*c"
                            "Email: %[^\n]%*c"
                            "Priority: %[^\n]%*c"
                            "Needed: %[^\n]%*c"
                            "Status: %[^\n]%*c"
                            "Description: ";
      while ( fscanf(file, format, 
                     record.date, 
                     record.requestor, 
                     record.email, 
                     record.priority, 
                     record.needed, 
                     record.status) == 6 )
      {
         printf("Date:      %s\n", record.date);
         printf("Requestor: %s\n", record.requestor);
         printf("Email:     %s\n", record.email);
         printf("Priority:  %s\n", record.priority);
         printf("Needed:    %s\n", record.needed);
         printf("Status:    %s\n", record.status);
         /*
          * fscanf did some rough stuff, but now we've got some work to do.
          */
         if ( foo(file, record.description, sizeof record.description) )
         {
            printf("Description: \n%s\n", record.description);
         }
      }
      fclose(file);
   }
   return 0;
}

/* my output
Date:      Feb 20, 2004
Requestor: Paul
Email:     [email protected]
Priority:  Medium
Needed:    now
Status:    ok
Description: 
Test here.

Date:      Feb 20, 2004
Requestor: Paul
Email:     [email protected]
Priority:  Medium
Needed:    now
Status:    ok
Description: 
Test here.
And here.
And here.
*/

Code:

                fgets(descline, sizeof(descline),fp);
                
                while( (strncmp(descline, ".",1)) != 0)
                {
                        strcat(description, descline);
                        fgets(descline, sizeof(descline),fp);
                }

I was trying this, which doesnt include the code to prepend the period.

If I get to something in the file like:

This is some text
.this is some text.
.this is more.
.

It wont read lines beginning with a period.

How can I fix this?

Thanks

>How can I fix this?

Did you try the code I posted?

Yes I have.

I appreciate the time you took to write that up, but I was hoping someone could explain why mine doesnt work.

I would also like to fully understand the code I use...

Thanks

Code:

strncmp(descline, ".",1)

If you intend to compare to more than one character, then compare to more than one character?