Thread: Little bit of help please

I am writing a program which reads in strings from a file in.txt and then converts it to html friendly text and outputs it to out.txt. When I try to run it I get a segmentation fault, so I am not sure what I am doing wrong.

Also, as you will see in my switch statement I have to convert the " ' " character to "&apos", but I don't know how to write " ' " in c.

Here is my code:

Code:

#include<stdio.h>
#include<stdlib.h>
#include<ctype.h>
#include<stdbool.h>

int main()
{
  FILE *in;
  FILE *out = NULL;

  in = fopen("in.txt", "r");
  if(in == NULL)
  {
    perror("Unable to open in.txt");
	return 1;
  }
  
  out = fopen("out.txt", "w");
  if(in == NULL)
  {
    fclose(in);
    perror("Unable to open out.txt");
    return 1;
  }

  char line[100];
  int i;
  while (fgets(&line[i], 100, in) != NULL)
  {
    for(i=0; i!= '\0' && i<100; ++i)
	{
	  switch (line[i])
	  {
	    case '"':
		fputs("&quot", out);
		break;
		
		case 'd':
		fputs("&apos", out);
		break;
		
		case '&':
		fputs("&amp", out);
		break;
		
		case '<':
		fputs("&lt", out);
		break;
		
		case '>':
		fputs("&gt", out);
		break;
		
		default:
		fputc(line[i], out);
		break;
	  }
	}
  }
  
  fclose(out);
  fclose(in);
}

Also here is the sample in.txt we are suppose to convert:

This is some text.
<TAG>
"Double Quote Line"
'single quote line'
An ampersand: &
</TAG>
End of file.


Thanks in advance for all the help!

I currently just put 'd' in the &apos spot because I wanted to see if it would compile and run

Originally Posted by mytrademark

Code:

  char line[100];
  int i;
  while (fgets(&line[i], 100, in) != NULL)
  {
    for(i=0; i!= '\0' && i<100; ++i)
	{
	  switch (line[i])
	  {

Oh my god, please read a good C book.
Try:

Code:

  char line[100];
  int i;
  while (fgets(line, 100, in) != NULL)
  {
    for(i=0; line[i]!='\0'; ++i)
	{
	  switch (line[i])
	  {

Thank you both so much. Works perfectly now!