conio_lt.h

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/*======================================================================
 * conio_lt, a lightweight version of <conio.h> library for Unix-like systems.
 * Copyright (C) 2023-2024 Ryuu Mitsuki
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 *======================================================================*/
 
#ifndef CONIO_LT_H_
#define CONIO_LT_H_
 
 
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <termios.h>
 
typedef unsigned int  cpos_t;  
static const char* __prefix = "\033[";  
static const int __getch(uint8_t __echo) {
    struct termios __oldt, __newt;
    int __c;
 
    tcgetattr(STDIN_FILENO, &__oldt);
    __newt = __oldt;
    __newt.c_lflag &= ~ICANON;
 
    if (__echo != 0) {  /* No echoing */
        __newt.c_lflag &= ECHO;
    } else {            /* Echoing */
        __newt.c_lflag &= ~ECHO;
    }
 
    tcsetattr(STDIN_FILENO, TCSANOW, &__newt);
    __c = getchar();  /* Retrieve the character */
    tcsetattr(STDIN_FILENO, TCSANOW, &__oldt);
 
    return __c;
}
 
static void __whereis_xy(cpos_t* __x, cpos_t* __y) {
    int in;
    cpos_t x = 0, y = 0;
    printf("%s6n", __prefix);
 
    /* If the character does not same as '\x1b' nor '\x5b',
     * immediately return and leaving the __x and __y references unchanged
     */
    if (__getch(0) != '\x1B') {
        return;
    } else if (__getch(0) != '\x5B') {
        return;
    }
 
    while ((in = __getch(0)) != ';') {
        y = y * 10 + in - '0';
    }
 
    while ((in = __getch(0)) != 'R') {
        x = x * 10 + in - '0';
    }
 
    /* Store and assign the cursor position */
    *__x = x;
    *__y = y;
}
 
 
 
void gotoxy(const cpos_t __x, const cpos_t __y) {
    printf("%s%u;%uf", __prefix, __y, __x);  /* "\033[{y};{x}f" */
}
 
void clrscr(void) {
    printf("%s0m%s1J%sH", __prefix, __prefix, __prefix);
}
 
void rstscr(void) {
    printf("%s0m\033c", __prefix);  /* "\033[0m\033c" */
}
 
const int ungetch(const int __c) {
    return ungetc(__c, stdin);
}
 
const int getch(void) {
    return __getch(0);  /* 0 means no echo */
}
 
const int getche(void) {
    return __getch(1);  /* non-zero means with echo */
}
 
const cpos_t wherex(void) {
    cpos_t __x = 0, __y = 0;
    __whereis_xy(&__x, &__y);
 
    return __x;  /* only return the X-coordinate */
}
 
const cpos_t wherey(void) {
    cpos_t __x = 0, __y = 0;
    __whereis_xy(&__x, &__y);
 
    return __y;  /* only return the Y-coordinate */
}
 
void wherexy(cpos_t* __x, cpos_t* __y) {
    __whereis_xy(__x, __y);
}
 
const int putch(const int __chr) {
    printf("%c", __chr);
    return __chr;
}
 
void gotox(const cpos_t __x) {
    gotoxy(__x, wherey());
}
 
void gotoy(const cpos_t __y) {
    gotoxy(wherex(), __y);
}
 
#endif /* CONIO_LT_H_ */