Thread: Thanks to OCD, I programed a new line remover for text files. Needs some work still.

So I've replaced '\r' and '\n' with '\0'. This, however, just fills up the file with 0s instead of just removing the contents all together. I would like to just fill the '\n' with nothing, not even zeros. No, the zeros don't show up on an average text editor, however, they do show as ^@ on vim and on a hex editor they show up as binary 0s.

The reason why I did this is because I've been creating SSH keys to log into my servers. When transferring the public keys via macOS or another *nix system, it would send the key as a one line text file.

Windows on the other hand did not. This annoyed me and I wanted to make something to remove all the new lines.

This is what I came up with.

Here's the source:

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main(int argc, const char *argv[]) {
    unsigned long long fileSize, programCounter;
    char *fileData;
    FILE *fp;
    
    fileSize = 0;
    fileData = NULL;
    fp = NULL;
    
    if(argc != 2) {
        fprintf(stderr, "Enter only one file, please.\n");
        return 1;
    }
    fp = fopen(argv[1], "r");
    if(fp == NULL) {
        fprintf(stderr, "Could not open file: %s.\n", argv[1]);
        return 1;
    }
    fseek(fp, 0L, SEEK_END);
    fileSize = ftell(fp);
    rewind(fp);
    
    fileData = malloc(fileSize);
    if(fileData == NULL) {
        fprintf(stderr, "Could not allocate memory.\n");
        return 1;
    }
    
    fread(fileData, fileSize, 1, fp);
    
    fclose(fp);
    
    for(programCounter = 0; programCounter < fileSize; programCounter++) {
        if(fileData[programCounter] == '\r')
            fileData[programCounter] = '\0';
        
        if(fileData[programCounter] == '\n')
            fileData[programCounter] = '\0';
    }
    
    fp = fopen(argv[1], "w");
    fwrite(fileData, fileSize, 1, fp);
    fclose(fp);
    
    free(fileData);
    
    return 0;
}