seer/tests/helloansicodes2/printfcolor.h

#ifndef PRINTFCOLOR_H
#define PRINTFCOLOR_H

#include <stdio.h>
#include <errno.h>
#include <stdarg.h>
#include <stdbool.h>

#ifdef _WIN32
#include <Windows.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif


typedef enum PfcColor {
    GRAY = 0,
    GREY = 0,
    BLUE = 1,
    GREEN = 2,
    CYAN = 3,
    RED = 4,
    MAGENTA = 5,
    YELLOW = 6,
    WHITE = 7
} PfcColor;


/**
 * Prints formatted output to the console with specified foreground and background colors.
 *
 * Colors: `RED, GREEN, BLUE, WHITE, GRAY (GREY), CYAN, MAGENTA, YELLOW`
 * 
 * @param fg_color  The color code for the text foreground color. 
 * @param bg_color  The color code for the text background color. 
 * @param format    A format string for the output. This is followed by additional arguments
 *                  to be formatted according to the format string.
 *
 * @return  The number of characters written to the console, or `-1` if an error occurs.
 *
 * @warning If the color codes are invalid or if the console screen buffer information cannot
 *          be retrieved, `errno` is set to `EINVAL` and `-1` is returned. 
 */
int printfc(PfcColor fg_color, PfcColor bg_color, const char *format, ...);

/**
 * Prints formatted output to the console with specified foreground color.
 * 
 * Colors: `RED, GREEN, BLUE, WHITE, GRAY (GREY), CYAN, MAGENTA, YELLOW`
 *
 * @param fg_color  The color code for the text foreground color.
 * @param format    A format string for the output. This is followed by additional arguments
 *                  to be formatted according to the format string.
 *
 * @return  The number of characters written to the console, or `-1` if an error occurs.
 *
 * @warning If the color code is invalid or if the console screen buffer information cannot
 *          be retrieved, `errno` is set to `EINVAL` and `-1` is returned. 
 */
int printfc_fg(PfcColor fg_color, const char *format, ...);

/**
 * Prints formatted output to the console with specified background color.
 * 
 * Colors: `RED, GREEN, BLUE, WHITE, GRAY (GREY), CYAN, MAGENTA, YELLOW`
 *
 * @param bg_color  The color code for the text background color.
 * @param format    A format string for the output. This is followed by additional arguments
 *                  to be formatted according to the format string.
 *
 * @return  The number of characters written to the console, or `-1` if an error occurs.
 *
 * @warning If the color code is invalid or if the console screen buffer information cannot
 *          be retrieved, `errno` is set to `EINVAL` and `-1` is returned. 
 */
int printfc_bg(PfcColor bg_color, const char *format, ...);


// Helper functions

static bool is_color_valid(PfcColor color)
{
    return color >= 0 && color <= 7;
}

static const char *get_fg_color_code(PfcColor color) {
    const char *colors[] = { 
        "\033[30m", "\033[34m", "\033[32m", "\033[36m",
        "\033[31m", "\033[35m", "\033[33m", "\033[37m" 
    };

    if (is_color_valid(color))
        return colors[color];
    else
        return NULL;
}

static const char *get_bg_color_code(PfcColor color) {
    const char *colors[] = { 
        "\033[40m", "\033[44m", "\033[42m", "\033[46m", 
        "\033[41m", "\033[45m", "\033[43m", "\033[47m" 
    };

    if (is_color_valid(color))
        return colors[color];
    else
        return NULL;
}

#ifdef _WIN32 // Windows

int printfc(PfcColor fg_color, PfcColor bg_color, const char *format, ...) 
{
    if (!is_color_valid(fg_color) || !is_color_valid(bg_color)) {
        errno = EINVAL;
        return -1;
    }

    HANDLE h_console = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO csbi_info;

    if (!GetConsoleScreenBufferInfo(h_console, &csbi_info)) {
        errno = EINVAL;
        return -1;
    }

    va_list args;
    va_start(args, format);

    SetConsoleTextAttribute(h_console, fg_color | (bg_color << 4));
    int chars_written = vprintf(format, args);
    SetConsoleTextAttribute(h_console, csbi_info.wAttributes);

    va_end(args);

    return chars_written;
}

int printfc_fg(PfcColor fg_color, const char *format, ...) 
{
    if (!is_color_valid(fg_color)) {
        errno = EINVAL;
        return -1;
    }

    HANDLE h_console = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO csbi_info;

    if (!GetConsoleScreenBufferInfo(h_console, &csbi_info)) {
        errno = EINVAL;
        return -1;
    }

    va_list args;
    va_start(args, format);

    SetConsoleTextAttribute(h_console, fg_color);

    int chars_written = vprintf(format, args);

    SetConsoleTextAttribute(h_console, csbi_info.wAttributes);

    va_end(args);

    return chars_written;
}

int printfc_bg(PfcColor bg_color, const char *format, ...) 
{
    if (!is_color_valid(bg_color)) {
        errno = EINVAL;
        return -1;
    }

    HANDLE h_console = GetStdHandle(STD_OUTPUT_HANDLE);
    CONSOLE_SCREEN_BUFFER_INFO csbi_info;

    if (!GetConsoleScreenBufferInfo(h_console, &csbi_info)) {
        errno = EINVAL;
        return -1;
    }

    va_list args;
    va_start(args, format);

    SetConsoleTextAttribute(h_console, (csbi_info.wAttributes & 0x0F) | (bg_color << 4));
    int chars_written = vprintf(format, args);
    SetConsoleTextAttribute(h_console, csbi_info.wAttributes);

    va_end(args);

    return chars_written;
}

#else // Linux and Unix-like

int printfc(PfcColor fg_color, PfcColor bg_color, const char *format, ...)
{
    if (!is_color_valid(fg_color) || !is_color_valid(bg_color)) {
        errno = EINVAL;
        return -1;
    }

    va_list args;
    va_start(args, format);

    printf("%s%s", get_fg_color_code(fg_color), get_bg_color_code(bg_color));
    int chars_written = vprintf(format, args);
    printf("\033[0m");

    va_end(args);

    return chars_written;
}

int printfc_fg(PfcColor fg_color, const char *format, ...) 
{
    if (!is_color_valid(fg_color)) {
        errno = EINVAL;
        return -1;
    }

    va_list args;
    va_start(args, format);

    printf("%s", get_fg_color_code(fg_color));
    int chars_written = vprintf(format, args);
    printf("\033[0m");

    va_end(args);

    return chars_written;
}

int printfc_bg(PfcColor bg_color, const char *format, ...) 
{
    if (!is_color_valid(bg_color)) {
        errno = EINVAL;
        return -1;
    }

    va_list args;
    va_start(args, format);

    printf("%s", get_bg_color_code(bg_color));
    int chars_written = vprintf(format, args);
    printf("\033[0m");

    va_end(args);

    return chars_written;
}

#endif // _WIN32

#ifdef __cplusplus
}
#endif

#endif // PRINTFCOLOR_H