Thread: Opening a file and formatting the output?

Let's say that I have a program that, so far, opens a TXT file and prints it back to the user.

Code:

#include <stdio.h>

void main()
{

   FILE *fopen(), *fp;
   int c;
   fp = fopen("text.txt","r+");
   c = getc(fp) ;
   while (c!= EOF)
   {
   		putchar(c);
		c = getc(fp);
   }
   fclose(fp);
}

I would like output of the read file to be formatted depending on what is read. For example, if 0x01 (Hex Value 01, yes) is read in the file, that is converted to \n (New Line function) and the final display to the user would be a new line.

Example (text.txt):
"How are you today, Tom?" asked Tim.[0x01 Hex Character here.]"I'm well, Tim. Thanks. How are you, Tim?" asked Tom.

Would be displayed as:
"How are you today, Tom?" asked Tim.
"I'm well, Tim. Thanks. How are you, Tim?" asked Tom.

I look forward to any assistance I can get. Thanks!

Why use 0x01 for the newline why not use the newline char (0x0a)?

Jim

Ummm... why wouldn't you just put a newline in the file?

Placing \n in the .txt file results in it being printed instead of a new line being made. Also, I forgot to mention... this is going to be used as a text parser for an existing video game that uses 0x01 for "New Line," 0x0F to show a certain variable inputted by the player, etc. Parsing it into something more user friendly and displaying it in the Command Line window is my plan.

Ok, then when you parse the file and run into the 0x01 convert it to the newline character to display it in the command line window.

Jim

Originally Posted by jimblumberg

Ok, then when you parse the file and run into the 0x01 convert it to the newline character to display it in the command line window.

Jim

That's pretty much the question, though. How would I go about searching for that in the file before parsing it and making it be converted? I've tried giving the #define thing a shot as well, but it didn't take me anywhere.

#define 0x01 \n

In the following code you are reading the file character by character.

Code:

   c = getc(fp) ;
   while (c!= EOF)
   {
   		putchar(c);
		c = getc(fp);
   }

If you test for 0x01 before you write the value to your console with putchar(c) and if it is 0x01 then write 0x0A instead of the 0x01 it should work. You may want to look at this link.

Jim

Quzah:
That's very helpful. #define is for more like labeling variables, in a way. I've seen the syntax before. Thanks.

Jimblumberg:
When you say, "testing for it," I get a slight idea in the back of my head. Do you have any example of that for me to burn into my mind? Thanks for the help.

Originally Posted by quzah

I know what a #define is. I also know what 0x01 is. 0x01 is a number. You can't have variables named after numbers, and you can't redefine numbers as something else. You can't do this either:

Code:

#define 4 5

Quzah.

Yes. A #define can be used for something more like:

Code:

#include <stdio.h>

#define MUFFINS 15
int main()
{
printf("You have %i muffins.\n",MUFFINS);
printf("Your friend gave you thirty new ones.\n");
printf("You now have %i muffins.\n",MUFFINS+30);
}

If you actually read my original post carefully, you would have seen, "I've tried giving the #define thing a shot as well, but it didn't take me anywhere."