54e5ecd6ec
The 4KB screen buffer (80x25x2 bytes) was allocated from near heap via calloc(), which exhausted the 64KB data segment on 16-bit DOS. Now uses _fcalloc()/_ffree() from OpenWatcom's far heap on 16-bit, keeping the buffer outside DGROUP. The TUI now works fully on 16-bit FreeDOS: full-screen editor, F-key bar, cursor positioning, and scroll -- all via BIOS INT 10h through the DOS HAL, with the screen buffer in far memory. Changes: - tui.h: GW_FAR macro (expands to __far on 16-bit, nothing elsewhere), tui.screen declared as tui_cell_t GW_FAR * - tui.c: _fcalloc/_ffree for 16-bit, _fmemmove for scroll_up() - TUI_CELL() macro works unchanged (far pointer dereference is transparent)
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
#ifndef GW_TUI_H
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#define GW_TUI_H
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#include <stdint.h>
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#include <stdbool.h>
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/* On 16-bit DOS, the screen buffer lives in far heap to save near heap.
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* GW_FAR expands to __far on 16-bit OpenWatcom, nothing elsewhere. */
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#if defined(_M_I86)
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#define GW_FAR __far
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#else
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#define GW_FAR
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#endif
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#define TUI_DEFAULT_ROWS 25
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#define TUI_DEFAULT_COLS 80
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#define TUI_MAX_ROWS 200
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#define TUI_MAX_COLS 300
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#define TUI_MAX_LINE 255
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/* Screen cell: character + color attribute */
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typedef struct {
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uint8_t ch;
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uint8_t attr; /* GW-BASIC color attribute (fg | bg<<4) */
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} tui_cell_t;
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/* Special key codes returned by tui_read_key() */
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#define TK_UP 0x100
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#define TK_DOWN 0x101
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#define TK_LEFT 0x102
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#define TK_RIGHT 0x103
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#define TK_HOME 0x104
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#define TK_END 0x105
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#define TK_DELETE 0x106
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#define TK_INSERT 0x107
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#define TK_PGUP 0x108
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#define TK_PGDN 0x109
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#define TK_F1 0x10A
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#define TK_F2 0x10B
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#define TK_F3 0x10C
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#define TK_F4 0x10D
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#define TK_F5 0x10E
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#define TK_F6 0x10F
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#define TK_F7 0x110
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#define TK_F8 0x111
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#define TK_F9 0x112
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#define TK_F10 0x113
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#define TK_CTRL_HOME 0x114
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#define TK_BACKSPACE 0x08
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#define TK_ENTER 0x0D
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#define TK_ESCAPE 0x1B
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#define TK_TAB 0x09
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#define TK_CTRL_C 0x03
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#define TK_CTRL_BREAK 0x200
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/* Key buffer for event trapping (keys consumed from HAL but not yet processed) */
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#define TUI_KEYBUF_SIZE 16
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/* TUI state */
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typedef struct {
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tui_cell_t GW_FAR *screen; /* dynamically allocated [rows * cols] */
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int rows; /* screen height (default 25) */
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int cols; /* screen width (default 80) */
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int cursor_row;
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int cursor_col;
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bool insert_mode;
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bool key_bar_visible; /* KEY ON */
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uint8_t current_attr; /* current color attribute */
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char fkey_defs[10][16]; /* F1-F10 definitions */
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bool active;
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volatile bool break_flag; /* set by SIGINT handler */
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int view_top; /* top of scrollable area */
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int view_bottom; /* bottom row (rows-1 normally, rows-2 with key bar) */
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int keybuf[TUI_KEYBUF_SIZE]; /* ring buffer for pushed-back keys */
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int keybuf_head;
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int keybuf_tail;
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} tui_state_t;
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extern tui_state_t tui;
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/* Lifecycle */
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void tui_init(bool fullscreen);
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void tui_shutdown(void);
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/* Screen cell access macro */
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#define TUI_CELL(r, c) tui.screen[(r) * tui.cols + (c)]
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/* Screen buffer operations (these replace HAL ops when TUI is active) */
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void tui_putch(int ch);
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void tui_puts(const char *s);
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void tui_cls(void);
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void tui_locate(int row, int col);
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int tui_get_cursor_row(void);
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int tui_get_cursor_col(void);
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/* Rendering */
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void tui_refresh(void);
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void tui_refresh_row(int row);
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void tui_update_cursor(void);
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/* Input */
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int tui_read_key(void);
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char *tui_read_line(void);
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/* Function key bar */
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void tui_key_on(void);
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void tui_key_off(void);
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void tui_key_list(void);
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/* EDIT statement */
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void tui_edit_line(const char *prefill);
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/* Key buffer for event trapping */
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void tui_push_key(int key);
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int tui_pop_key(void);
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bool tui_keybuf_empty(void);
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/* Map TK_* key code to IBM PC scan code; returns -1 for ASCII keys */
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int tui_key_to_scancode(int key);
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/* Ctrl+Break */
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void tui_check_break(void);
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void tui_install_break_handler(void);
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/* Cursor shape */
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void tui_set_cursor_block(void);
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void tui_set_cursor_line(void);
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#endif
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