// Write a C program which removes all of the non-printable 
// ASCII bytes (except for new lines)
// from a file specified by the first command-line argument.
// You may create temporary files
// You can not assume file is small enough to be read completely into memory


//What do we think will happen to emoji?
//What do we think will happen if we remove the close files?
//Can we use rename instead?



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

//Strategy:  
//REad in file

//abdcXabcbdXabcb  <-Read this in
//abdcabc          <-print to a temp file
//copy it back to the original one

// Args:
// argv[0] = ./file_revision
// argv[1] = f_name
int main(int argc, char *argv[]) {
    if (argc != 2) {
        fprintf(stderr, "Incorrect usage %s\n", argv[0]);
        return 1;
    }

    FILE *file_reader = fopen(argv[1], "r");
    if (file_reader == NULL) {
        perror("file_reader");
        return 1;
    }

    FILE *temp_writer = fopen("temp", "w");
    if (temp_writer == NULL) {
        perror("temp_writer");
        return 1;
    }

    // read in bytes from file_reader
    // write the bytes to the temp file
    int byte;
    while ((byte = fgetc(file_reader)) != EOF) {
        if(isprint(byte) || byte == '\n'){
            fputc(byte, temp_writer);
        }
    }

    fclose(temp_writer);
    fclose(file_reader);

    rename("temp", argv[1]);

/*
    // Copy it all back
    FILE *temp_reader = fopen("temp", "r");
    if (temp_reader == NULL) {
        perror("temp_reader");
        return 1;
    }

    FILE *file_writer = fopen(argv[1], "w");
    if (file_writer == NULL) {
        perror("file_writer");
        return 1;
    }

    while ((byte = fgetc(temp_reader)) != EOF) {
        fputc(byte, file_writer);
    }


    fclose(temp_reader);
    fclose(file_writer);

 */   
    return 0;
}