lib.c

#include <stdint.h>
#include <stdio.h>

int get_height(FILE *image) {
    fseek(image, 22, SEEK_SET);
    int height;
    fread(&height, 4, 1, image);
    return height;
}

int get_width(FILE *image) {
    fseek(image, 18, SEEK_SET);
    int width;
    fread(&width, 4, 1, image);
    return width;
}

int cprint(char buffer[], int buflen, int red, int green, int blue) {
  return snprintf(buffer, buflen, "\033[48;2;%d;%d;%dm \033[0m", red, green, blue);
}

int get_padding(int width) {
    int nat_width = width * 3;
    if (nat_width % 4 == 0) {
        return 0;
    }

    int n2 = nat_width;
    while (n2 % 4 != 0) {
        n2++;
    }

    return n2 - nat_width;

}

void write_line(int width, char buffer[], int buflen, FILE *image) {
    int strlength;

    for (int i = 0; i < width; i++) {
        int red = 0;
        int green = 0;
        int blue = 0;
        fread(&blue, 1, 1, image);
        fread(&green, 1, 1, image);
        fread(&red, 1, 1, image);
        strlength = cprint(buffer, buflen, red, green, blue);
        buffer += strlength;
    }
}