curses.h

/*
 * Copyright (c) 2023, 2024 Logan Ryan McLintock
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef CURSES_H
#define CURSES_H


#ifndef _WIN32
/* For struct termios */
#include <termios.h>
#endif

/* For size_t */
#include <stddef.h>
#include <stdint.h>

/* Success is 0 or: */
#ifndef OK
#define OK 0
#endif

/* Only use with curses */
#define ERR EOF

struct screen {
#ifdef _WIN32
    HANDLE term_handle;
    DWORD term_orig;
    DWORD term_new;
#else
    struct termios term_orig;
    struct termios term_new;
#endif
    size_t h;                   /* Physical screen heigth */
    size_t w;                   /* Physical screen width */
    unsigned char *vs_c;        /* Current virtual screen */
    unsigned char *vs_n;        /* Next virtual screen */
    size_t vs_s;                /* Size of each virtual screen */
    size_t v_i;                 /* Virtual cursor index (print location) */
    int v_hl;                   /* Virtual highlight mode indicator */
    int non_blocking;           /* Non-blocking getch */
    size_t tabsize;             /* Number of spaces printed for a Tab */
    int clear;                  /* Clear physical screen */
    int centre;                 /* Draw cursor on the centre row */
    unsigned char *a;           /* Unread memory buffer */
    /* Index of next unused space in unread memory buffer */
    size_t i;
    size_t n;                   /* Allocated size of unread memory buffer */
};


typedef struct screen WINDOW;
typedef char chtype;

/*
 * Only ASCII characters are supported, and the highest order bit is used
 * for the attributes component.
 */
#define A_CHARTEXT 0x7F
#define A_ATTRIBUTES 0x80

/* Highlighting is the only attribute that is implemented */
#define A_STANDOUT 0x80


#ifdef IN_CURSES_LIB
/* In library, so external variable */
extern WINDOW *stdscr;
#else
/* In application source, so global variable */
WINDOW *stdscr;
#endif


typedef unsigned char bool;

#ifndef FALSE
#define FALSE 0
#endif

#ifndef TRUE
#define TRUE (!FALSE)
#endif


#define C(l) ((l) - 'a' + 1)


/* Set to Ctrl-H */


#define KEY_LEFT  (UCHAR_MAX + 1)
#define KEY_RIGHT (UCHAR_MAX + 2)
#define KEY_UP    (UCHAR_MAX + 3)
#define KEY_DOWN  (UCHAR_MAX + 4)
#define KEY_DC    (UCHAR_MAX + 5)
#define KEY_HOME  (UCHAR_MAX + 6)
#define KEY_END   (UCHAR_MAX + 7)

/* Not set by this implementation */
#define KEY_BACKSPACE (UCHAR_MAX + 8)

#define TABSIZE (stdscr->tabsize)


/* void getmaxyx(WINDOW *win, int y, int x); */
#define getmaxyx(win, y, x) do { \
    (y) = (win)->h;              \
    (x) = (win)->w;              \
} while (0)


/* void getyx(WINDOW *win, int y, int x); */
#define getyx(win, y, x) do {    \
    (y) = (win)->v_i / (win)->w; \
    (x) = (win)->v_i % (win)->w; \
} while (0)


/* Function declarations */
WINDOW *initscr(void);
int endwin(void);
int set_tabsize(size_t size);
int getch(void);
int erase(void);
int clear(void);
int refresh(void);
int addch(unsigned char ch);
int addnstr(const char *str, int n);
int move(int y, int x);
chtype inch(void);
int clrtoeol(void);
int standend(void);
int standout(void);
int raw(void);
int noecho(void);
int keypad(WINDOW *win, bool bf);
int nodelay(WINDOW *win, bool bf);
int curs_set(int visibility);

#endif