Thread: Read from a Text File - Segmentation Fault

Hello All,

This post is regarding reading from a text file.

Background - I am trying to fill my Text struct field member char** lines with the strings from text file. However, I am having trouble simply reading from the text file itself.

I am thinking that there is an error with my while loop but am having some difficulty debugging. Anyone have an idea why my while loop is triggering a Segmentation Fault?

My code is here:

Code:

bool fill_text(Text* text, char* fileName)
{
      FILE *filePtr = fopen(fileName, "r");
      
      if(filePtr == NULL)
      {
            return false;
      } else {

            char** line = text->lines;
            int max = text->maxLineCount;
            int iter = 0;

            while (fgets(line[iter], max, filePtr) != NULL)
            {
                  // Printing line[iter] here to see if fgets and while are working correctly.
                  printf("%s\n",line[iter]);
                  iter++;
            }

            return true;
      }

}

Just in case, allow me to ask the obvious question: did you allocate sufficient storage for the strings? I notice that you have max line count, but that sounds like the maximum number of lines rather than the maximum number of characters (including null character) per line, which is what fgets requires. You should be comparing iter with max instead to avoid exceeding the max number of lines.