Text Formatting Program Help

Hello,
I am working on a program that takes text and modifies it so it can be printed. It adds lines between paragraphs, page numbers, etc.

I am having problems modifying the actual text. I have an outline:

Code:

#include <stdio.h>

void txt2prt(char *input, char *output);
char *header(int page);
char *footer(int page);

int main(int argc, char *argv[]) {
    char *infile = "infile.txt";
    char *outfile = "output.txt";
    
    //argc counts executable as 1 arg
    if( argc == 2 ) {
        infile = argv[1];
    }
    
    if( argc == 3 ) {
        infile = argv[1];
        outfile = argv[2];
    }
    
    txt2prt(infile, outfile);
    
    return 0;
}

void txt2prt(char *input, char *output) {
    int currentPage = 1;
    while(*input){
		do(*input

    //While read from infile, do header, parse and print and footer
}

char *header(int page) {
    char *retStr;

    //ADD HEADER AND PAGE NUM TO retStr
    
    return retStr;
}

char *footer(int page) {
    char *retStr;
    
    //ADD FOOTER AND PAGE NUM TO retStr
    
    return retStr;
}

I was going to use a series of condition statements to apply the various indents and blank lines, etc. I was just wondering how I would go about modifying the input text (getting the input, and outputting something else)

Cheers,
Larph

Well the first step would be to write a program which simply copies the input file to the output file one line at a time.

Then you can add things like
- a count of the lines read, and then work out where page boundaries go (for header and footer).
- work out where paragraphs are (what is your assignment specification for this?), then add blank lines.

Incremental development - begin by working out what series of small steps will get you to your goal.