Question

I have this simple block of code who reads a line in a file with fgets().
Now I want to search in this line if there is a “{” or a “}” and put an ignore comment on the commented ones. For the functions { and } I want to add a comment like this //This is a good { . How could I manage to do that ? Should I use regex ? I removed the while loop to simplify the line by line iteration.

Can I somehow use mystring, wich I think is an array ? Can I append mystring of modify it ? Or what I have to do is to make a new array, put mystring in it and then after put the comments.

For example : myfile.txt

/* Hello {} */
function
{
  hello();
}

Output

/* Hello {} */ //Ignored
function
{ //This is a good {
  hello();
} //This is a good }

My simple block :

#include <stdio.h>
int main()
{
    FILE * pFile;
    char mystring [100];

    pFile = fopen ("myfile.txt" , "r");
    if (pFile == NULL) perror ("Error opening file");
    else {
        if ( fgets (mystring , 100 , pFile) != NULL )
            puts (mystring);
        fclose (pFile);
    }
    return 0;
}

Answer 1

Here’s a simple approach, how you could process your mystring.

char *ptr=strchr(mystring,'{');
if(ptr)
{  
   sprintf(mystring,"%s //This is a goof {",mystring);
}
else
{
  ptr=strchr(mystring,'}');
  if(ptr)
  {
     sprintf(mystring,"%s //This is a goof }",mystring);
  }
}

Hope this helps.