/* * autistdraw.c: terminal drawing for NEET autists^Wartists * * Copyright (c) 2014, Přemysl Janouch * All rights reserved. * * 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. * */ #include #include #include #include #include #include #include #include #include #include "termo.h" #include "config.h" #include "utils.c" #define PALETTE_WIDTH 9 ///< Width of the palette #define TOP_BAR_CUTOFF 3 ///< Height of the top bar #define BITMAP_BLOCK_SIZE 50 ///< Step for extending bitmap size #define PROTOCOL_VERSION 1 ///< Network protocol version enum { MESSAGE_HELLO, ///< Server/client hello MESSAGE_GET_BITMAP, ///< Request bitmap data MESSAGE_PUT_POINT, ///< Request to place a point MESSAGE_COUNT ///< Total number of messages }; typedef enum network_mode network_mode_t; enum network_mode { NETWORK_MODE_STANDALONE, ///< No networking taking place NETWORK_MODE_SERVER, ///< We're the server NETWORK_MODE_CLIENT ///< We're a client }; typedef struct write_req write_req_t; struct write_req { uv_write_t req; ///< libuv write request uv_buf_t buf; ///< The data to be written }; typedef struct client client_t; struct client { LIST_HEADER (client_t) uv_tcp_t handle; ///< TCP connection handle struct msg_reader msg_reader; ///< Client message reader }; #define BITMAP_PIXEL(app, x, y) (app)->bitmap[(y) * (app)->bitmap_w + (x)] typedef struct app_context app_context_t; struct app_context { termo_t *tk; ///< Termo instance uv_tty_t tty; ///< TTY uv_poll_t tty_watcher; ///< TTY input watcher uv_timer_t tty_timer; ///< TTY timeout timer uv_signal_t winch_watcher; ///< SIGWINCH watcher network_mode_t mode; ///< Networking mode char read_buf[8192]; ///< Global read buffer for libuv // Client: uv_tcp_t server_fd; ///< Connection to the server struct msg_reader msg_reader; ///< Server message reader // Server: uv_tcp_t listen_fd; ///< Listening FD client_t *clients; ///< Client connections chtype palette[2 * 9]; ///< Attribute palette uint8_t *bitmap; ///< Canvas data for drawing int bitmap_x; ///< X coord. of left top bitmap corner int bitmap_y; ///< Y coord. of left top bitmap corner size_t bitmap_w; ///< Canvas data width size_t bitmap_h; ///< Canvas data height int center_x; ///< X coordinate at center int center_y; ///< Y coordinate at center // These two are computed from `center_x' and `center_y': int corner_x; ///< X coordinate of LT screen corner int corner_y; ///< Y coordinate of LT screen corner int move_saved_x; ///< Saved X coord. for moving int move_saved_y; ///< Saved Y coord. for moving uint8_t current_color_left; ///< Left mouse button color uint8_t current_color_right; ///< Right mouse button color }; static void remove_client (app_context_t *app, client_t *client); static void on_server_disconnected (app_context_t *app); static void app_init (app_context_t *self) { memset (self, 0, sizeof *self); msg_reader_init (&self->msg_reader); } static void app_free (app_context_t *self) { if (self->tk) termo_destroy (self->tk); while (self->clients) // XXX: we probably shouldn't do this from here remove_client (self, self->clients); free (self->bitmap); msg_reader_free (&self->msg_reader); } // --- Server-client messaging ------------------------------------------------- static write_req_t * flush_writer (struct msg_writer *writer) { size_t len; void *data = msg_writer_flush (writer, &len); write_req_t *req = xcalloc (1, sizeof *req); req->buf = uv_buf_init (data, len); return req; } static void on_data_written_to_client (uv_write_t *req, int status) { write_req_t *wr = (write_req_t *) req; app_context_t *app = req->handle->loop->data; client_t *client = req->data; if (status) // Write failed remove_client (app, client); free (wr->buf.base); free (wr); } static void flush_writer_to_client (struct msg_writer *writer, client_t *client) { write_req_t *wr = flush_writer (writer); wr->req.data = client; (void) uv_write (&wr->req, (uv_stream_t *) &client->handle, &wr->buf, 1, on_data_written_to_client); // XXX: should we put the request on a list so that we can get rid of it? } static void on_data_written_to_server (uv_write_t *req, int status) { write_req_t *wr = (write_req_t *) req; app_context_t *app = req->handle->loop->data; if (status) // Write failed on_server_disconnected (app); free (wr->buf.base); free (wr); } static void flush_writer_to_server (struct msg_writer *writer, app_context_t *app) { write_req_t *wr = flush_writer (writer); (void) uv_write (&wr->req, (uv_stream_t *) &app->server_fd, &wr->buf, 1, on_data_written_to_server); // XXX: should we put the request on a list so that we can get rid of it? } static void send_draw_point_response (client_t *client, int x, int y, uint8_t color) { struct msg_writer writer; msg_writer_init (&writer); msg_writer_u8 (&writer, MESSAGE_PUT_POINT); msg_writer_i32 (&writer, x); msg_writer_i32 (&writer, y); msg_writer_u8 (&writer, color); flush_writer_to_client (&writer, client); } static void send_draw_point_request (app_context_t *app, int x, int y, uint8_t color) { struct msg_writer writer; msg_writer_init (&writer); msg_writer_u8 (&writer, MESSAGE_PUT_POINT); msg_writer_i32 (&writer, x); msg_writer_i32 (&writer, y); msg_writer_u8 (&writer, color); flush_writer_to_server (&writer, app); } static void send_hello_request (app_context_t *app) { struct msg_writer writer; msg_writer_init (&writer); msg_writer_u8 (&writer, MESSAGE_HELLO); msg_writer_u8 (&writer, PROTOCOL_VERSION); flush_writer_to_server (&writer, app); } static void send_hello_response (client_t *client) { struct msg_writer writer; msg_writer_init (&writer); msg_writer_u8 (&writer, MESSAGE_HELLO); msg_writer_u8 (&writer, PROTOCOL_VERSION); flush_writer_to_client (&writer, client); } static void send_get_bitmap_request (app_context_t *app) { struct msg_writer writer; msg_writer_init (&writer); msg_writer_u8 (&writer, MESSAGE_GET_BITMAP); flush_writer_to_server (&writer, app); } static void send_get_bitmap_response (client_t *client, app_context_t *app) { struct msg_writer writer; msg_writer_init (&writer); msg_writer_u8 (&writer, MESSAGE_GET_BITMAP); msg_writer_i32 (&writer, app->bitmap_x); msg_writer_i32 (&writer, app->bitmap_y); msg_writer_u64 (&writer, app->bitmap_w); msg_writer_u64 (&writer, app->bitmap_h); msg_writer_blob (&writer, app->bitmap, app->bitmap_w * app->bitmap_h * sizeof *app->bitmap); flush_writer_to_client (&writer, client); } // --- Server-client messaging ------------------------------------------------- static void display (const char *format, ...) { va_list ap; mvwhline (stdscr, 0, 0, A_REVERSE, COLS); attron (A_REVERSE); va_start (ap, format); vw_printw (stdscr, format, ap); va_end (ap); attroff (A_REVERSE); refresh (); } static void init_palette (app_context_t *app) { start_color (); // Also does init_pair (0, -1, -1); use_default_colors (); // Duplicate it for convenience. init_pair (9, -1, -1); // Add the basic 8 colors to the default pair. Once normally, once // inverted to workaround VTE's inability to set a bright background. for (int i = 0; i < 8; i++) { init_pair (1 + i, COLOR_WHITE, COLOR_BLACK + i); init_pair (10 + i, COLOR_BLACK + i, COLOR_WHITE); } // Initialize the palette of characters with attributes for (int i = 0; i < PALETTE_WIDTH; i++) { app->palette[i] = ' ' | COLOR_PAIR (i); app->palette[i + 9] = ' ' | COLOR_PAIR (i + 9) | A_REVERSE | A_BOLD; } // This usually creates a solid black or white. app->current_color_left = app->current_color_right = 9; } static void update_canvas_for_screen (app_context_t *app) { app->corner_x = app->center_x - COLS / 2; app->corner_y = app->center_y - (LINES - TOP_BAR_CUTOFF) / 2; } static void redraw (app_context_t *app) { int i; mvwhline (stdscr, 1, 0, A_REVERSE, COLS); mvwhline (stdscr, 2, 0, A_REVERSE, COLS); for (i = 0; i < COLS; i++) { int pair = (float) i / COLS * PALETTE_WIDTH; mvaddch (1, i, app->palette[pair]); mvaddch (2, i, app->palette[pair + PALETTE_WIDTH]); } display ("Choose a color from the palette and draw. " "Press Escape or ^C to quit."); refresh (); } static bool is_in_bitmap_data (app_context_t *app, int x, int y) { return x >= app->bitmap_x && y >= app->bitmap_y && x < app->bitmap_x + (int) app->bitmap_w && y < app->bitmap_y + (int) app->bitmap_h; } static void redraw_canvas (app_context_t *app) { int y = app->corner_y; for (int screen_y = TOP_BAR_CUTOFF; screen_y < LINES; screen_y++, y++) { move (screen_y, 0); int x = app->corner_x; for (int screen_x = 0; screen_x < COLS; screen_x++, x++) { uint8_t color = 0; if (is_in_bitmap_data (app, x, y)) color = BITMAP_PIXEL (app, x - app->bitmap_x, y - app->bitmap_y); addch (app->palette[color]); } } refresh (); } static bool is_visible (app_context_t *app, int x, int y) { return x >= app->corner_x && y >= app->corner_y && x < app->corner_x + COLS && y < app->corner_y + LINES - TOP_BAR_CUTOFF; } static void make_place_for_point (app_context_t *app, int x, int y) { if (is_in_bitmap_data (app, x, y)) return; // Make sure the point has some place to go int new_bitmap_x = app->bitmap_x; int new_bitmap_y = app->bitmap_y; while (new_bitmap_x > x) new_bitmap_x -= BITMAP_BLOCK_SIZE; while (new_bitmap_y > y) new_bitmap_y -= BITMAP_BLOCK_SIZE; int new_bitmap_w = app->bitmap_w + (app->bitmap_x - new_bitmap_x); int new_bitmap_h = app->bitmap_h + (app->bitmap_y - new_bitmap_y); while (new_bitmap_x + new_bitmap_w <= x) new_bitmap_w += BITMAP_BLOCK_SIZE; while (new_bitmap_y + new_bitmap_h <= y) new_bitmap_h += BITMAP_BLOCK_SIZE; uint8_t *new_bitmap = xcalloc (new_bitmap_w * new_bitmap_h, sizeof *new_bitmap); if (app->bitmap) { // Copy data, assuming that the area can only get larger for (size_t data_y = 0; data_y < app->bitmap_h; data_y++) memcpy (new_bitmap + ((data_y + app->bitmap_y - new_bitmap_y) * new_bitmap_w) + (app->bitmap_x - new_bitmap_x), app->bitmap + (data_y * app->bitmap_w), app->bitmap_w * sizeof *new_bitmap); free (app->bitmap); } // Replace the bitmap with the reallocated version app->bitmap_x = new_bitmap_x; app->bitmap_y = new_bitmap_y; app->bitmap_w = new_bitmap_w; app->bitmap_h = new_bitmap_h; app->bitmap = new_bitmap; } static void draw_point (app_context_t *app, int x, int y, uint8_t color) { make_place_for_point (app, x, y); BITMAP_PIXEL (app, x - app->bitmap_x, y - app->bitmap_y) = color; if (is_visible (app, x, y)) { int screen_x = x - app->corner_x; int screen_y = y - app->corner_y + TOP_BAR_CUTOFF; move (screen_y, screen_x); addch (app->palette[color]); refresh (); } // Broadcast the clients about the event if (app->mode == NETWORK_MODE_SERVER) for (client_t *iter = app->clients; iter; iter = iter->next) send_draw_point_response (iter, x, y, color); } // --- Exports ----------------------------------------------------------------- static bool is_data_row_empty (app_context_t *app, int y) { for (size_t x = 0; x < app->bitmap_w; x++) if (app->bitmap[y * app->bitmap_w + x]) return false; return true; } static bool is_data_column_empty (app_context_t *app, int x) { for (size_t y = 0; y < app->bitmap_h; y++) if (app->bitmap[y * app->bitmap_w + x]) return false; return true; } static void find_data_bounding_rect (app_context_t *app, size_t *x, size_t *y, size_t *w, size_t *h) { size_t my_x = 0, my_y = 0; size_t my_w = app->bitmap_w, my_h = app->bitmap_h; size_t i; i = 0; while (i < app->bitmap_h && is_data_row_empty (app, i++)) my_y++; // Special case: the whole canvas is empty if (my_y == my_h) { my_x = my_w; goto end; } i = app->bitmap_h; while (i-- && is_data_row_empty (app, i)) my_h--; i = 0; while (i < app->bitmap_w && is_data_column_empty (app, i++)) my_x++; i = app->bitmap_w; while (i-- && is_data_column_empty (app, i)) my_w--; end: *x = my_x; *y = my_y; *w = my_w - my_x; *h = my_h - my_y; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static const char * color_to_ansi (uint8_t color) { static const char *table[2 * PALETTE_WIDTH] = { "\033[0m", "\033[0;40m", "\033[0;41m", "\033[0;42m", "\033[0;43m", "\033[0;44m", "\033[0;45m", "\033[0;46m", "\033[0;47m", "\033[0;1;7m", "\033[0;1;7;30m", "\033[0;1;7;31m", "\033[0;1;7;32m", "\033[0;1;7;33m", "\033[0;1;7;34m", "\033[0;1;7;35m", "\033[0;1;7;36m", "\033[0;1;7;37m", }; if (color > sizeof table / sizeof table[0]) return NULL; return table[color]; } static void export_ansi (app_context_t *app) { FILE *fp = fopen ("export-ansi.asc", "wb"); if (!fp) { display ("Error opening file for writing."); beep (); return; } size_t x, y, w, h; find_data_bounding_rect (app, &x, &y, &w, &h); for (size_t row = 0; row < h; row++) { const char *color = NULL; for (size_t column = 0; column < w; column++) { const char *new_color = color_to_ansi (BITMAP_PIXEL (app, x + column, y + row)); if (color != new_color) fputs (new_color, fp); color = new_color; fputc (' ', fp); } // We need to reset the attributes fputs (color_to_ansi (0), fp); fputc ('\n', fp); } fclose (fp); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - enum { MIRC_NONE = -1, MIRC_WHITE = 0, MIRC_BLACK = 1, MIRC_BLUE = 2, MIRC_GREEN = 3, MIRC_L_RED = 4, MIRC_RED = 5, MIRC_PURPLE = 6, MIRC_ORANGE = 7, MIRC_YELLOW = 8, MIRC_L_GREEN = 9, MIRC_CYAN = 10, MIRC_L_CYAN = 11, MIRC_L_BLUE = 12, MIRC_L_PURPLE = 13, MIRC_GRAY = 14, MIRC_L_GRAY = 15, MIRC_TRANSPARENT = 99 }; static int color_to_mirc (uint8_t color) { static const int table[2 * PALETTE_WIDTH] = { // XXX: not sure what to map the default color pair to; // the mIRC code for reverse colours seems to not be well supported MIRC_TRANSPARENT, MIRC_BLACK, MIRC_RED, MIRC_GREEN, MIRC_YELLOW, MIRC_BLUE, MIRC_PURPLE, MIRC_CYAN, MIRC_L_GRAY, MIRC_BLACK, MIRC_GRAY, MIRC_L_RED, MIRC_L_GREEN, MIRC_YELLOW, MIRC_L_BLUE, MIRC_L_PURPLE, MIRC_L_CYAN, MIRC_WHITE }; if (color > sizeof table / sizeof table[0]) return MIRC_NONE; return table[color]; } static void export_irc (app_context_t *app) { FILE *fp = fopen ("export-irc.asc", "wb"); if (!fp) { display ("Error opening file for writing."); beep (); return; } size_t x, y, w, h; find_data_bounding_rect (app, &x, &y, &w, &h); for (size_t row = 0; row < h; row++) { int color = MIRC_NONE; for (size_t column = 0; column < w; column++) { int new_color = color_to_mirc (BITMAP_PIXEL (app, x + column, y + row)); if (color != new_color) fprintf (fp, "\x03%02d,%02d", new_color, new_color); color = new_color; fputc ('_', fp); } fputc ('\n', fp); } fclose (fp); } // --- Loading, saving --------------------------------------------------------- static void load (app_context_t *app) { FILE *fp = fopen ("drawing.bin", "rb"); if (!fp) { display ("Error opening file for reading."); beep (); return; } // Client cannot load at all, the server would have send the new bitmap out if (app->mode != NETWORK_MODE_STANDALONE) { display ("Cannot load bitmaps in networked mode."); beep (); return; } // Some way of loading/saving is better than no way, let's just do our job. // The format neither standardised nor effective but it works for us. // We just eat everything and make sure to not crash. int x, y; size_t w, h; if (fscanf (fp, "%d %d %zu %zu", &x, &y, &w, &h) != 4) goto error; size_t size = w * h; uint8_t *bitmap = calloc (size, sizeof *bitmap); if (!bitmap) goto error; char c; uint8_t pixel = 0; bool have_nibble = false; size_t loaded = 0; while (loaded < size && (c = fgetc (fp)) != EOF) { static const char digits[] = "0123456789abcdef"; const char *value = strchr (digits, c); if (value && c != '\0') { pixel = pixel << 4 | (value - digits); if (have_nibble) bitmap[loaded++] = pixel; have_nibble = !have_nibble; } } free (app->bitmap); app->bitmap = bitmap; app->bitmap_h = h; app->bitmap_x = x; app->bitmap_w = w; app->bitmap_y = y; redraw_canvas (app); error: fclose (fp); } static void save (app_context_t *app) { FILE *fp = fopen ("drawing.bin", "wb"); if (!fp) { display ("Error opening file for writing."); return; } int x = app->bitmap_x, y = app->bitmap_y; size_t w = app->bitmap_w, h = app->bitmap_h; fprintf (fp, "%d %d %zu %zu\n", x, y, w, h); for (size_t row = 0; row < h; row++) { for (size_t column = 0; column < w; column++) fprintf (fp, "%02x", BITMAP_PIXEL (app, column, row)); fputc ('\n', fp); } fclose (fp); } // --- Event handlers ---------------------------------------------------------- static void move_canvas (app_context_t *app, int x, int y) { app->corner_x += x; app->corner_y += y; app->center_x += x; app->center_y += y; redraw_canvas (app); } static void on_mouse (app_context_t *app, termo_key_t *key) { int screen_y, screen_x, button; termo_mouse_event_t event; termo_interpret_mouse (app->tk, key, &event, &button, &screen_y, &screen_x); if (event != TERMO_MOUSE_PRESS && event != TERMO_MOUSE_DRAG) return; // Middle mouse button, or Ctrl + left mouse button, moves the canvas if (button == 2 || (button == 1 && key->modifiers == TERMO_KEYMOD_CTRL)) { if (event == TERMO_MOUSE_DRAG) move_canvas (app, app->move_saved_x - screen_x, app->move_saved_y - screen_y); app->move_saved_x = screen_x; app->move_saved_y = screen_y; return; } uint8_t *color; if (button == 1) color = &app->current_color_left; else if (button == 3) color = &app->current_color_right; else return; int canvas_x = app->corner_x + screen_x; int canvas_y = app->corner_y + screen_y - TOP_BAR_CUTOFF; if (screen_y >= TOP_BAR_CUTOFF) { if (app->mode == NETWORK_MODE_CLIENT) send_draw_point_request (app, canvas_x, canvas_y, *color); else draw_point (app, canvas_x, canvas_y, *color); } else if (screen_y > 0 && event != TERMO_MOUSE_DRAG) { int pair = (float) screen_x / COLS * PALETTE_WIDTH; *color = pair + (screen_y - 1) * PALETTE_WIDTH; } } static bool on_key (app_context_t *app, termo_key_t *key) { if (key->type == TERMO_TYPE_KEYSYM) { if (key->code.sym == TERMO_SYM_ESCAPE) return false; if (key->modifiers) return true; switch (key->code.sym) { case TERMO_SYM_UP: move_canvas (app, 0, -1); break; case TERMO_SYM_DOWN: move_canvas (app, 0, 1); break; case TERMO_SYM_LEFT: move_canvas (app, -1, 0); break; case TERMO_SYM_RIGHT: move_canvas (app, 1, 0); break; default: break; } return true; } if (key->type == TERMO_TYPE_KEY) { if ((key->modifiers & TERMO_KEYMOD_CTRL) && (key->code.codepoint == 'C' || key->code.codepoint == 'c')) return false; if (key->modifiers) return true; if (key->code.codepoint == 'l') load (app); if (key->code.codepoint == 's') save (app); if (key->code.codepoint == 'e') export_ansi (app); if (key->code.codepoint == 'E') export_irc (app); return true; } if (key->type == TERMO_TYPE_MOUSE) on_mouse (app, key); return true; } static void on_winch (uv_signal_t *handle, int signum) { app_context_t *app = handle->loop->data; (void) signum; #ifdef HAVE_RESIZETERM int w, h; if (!uv_tty_get_winsize (&app->tty, &w, &h)) { char *row = getenv ("LINES"); char *col = getenv ("COLUMNS"); unsigned long tmp; resizeterm ( (row && xstrtoul (&tmp, row, 10)) ? (int) tmp : h, (col && xstrtoul (&tmp, col, 10)) ? (int) tmp : w); } #else // ! HAVE_RESIZETERM endwin (); refresh (); #endif // ! HAVE_RESIZETERM update_canvas_for_screen (app); redraw (app); redraw_canvas (app); } static void on_key_timer (uv_timer_t *handle) { app_context_t *app = handle->loop->data; termo_key_t key; if (termo_getkey_force (app->tk, &key) == TERMO_RES_KEY) if (!on_key (app, &key)) uv_stop (handle->loop); } static void on_tty_readable (uv_poll_t *handle, int status, int events) { // Ignoring and hoping for the best (void) status; (void) events; app_context_t *app = handle->loop->data; uv_timer_stop (&app->tty_timer); termo_advisereadable (app->tk); termo_key_t key; termo_result_t ret; while ((ret = termo_getkey (app->tk, &key)) == TERMO_RES_KEY) if (!on_key (app, &key)) uv_stop (handle->loop); if (ret == TERMO_RES_AGAIN) uv_timer_start (&app->tty_timer, on_key_timer, termo_get_waittime (app->tk), 0); } static void app_uv_allocator (uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) { // Let's just use a single "global" buffer (void) suggested_size; app_context_t *app = handle->loop->data; buf->base = app->read_buf; buf->len = sizeof app->read_buf; } // --- Client-specific stuff --------------------------------------------------- typedef void (*server_handler_fn) (app_context_t *, struct msg_unpacker *); static void on_server_disconnected (app_context_t *app) { // TODO: cancel any write requests? // XXX: should we unref it? uv_close ((uv_handle_t *) &app->server_fd, NULL); display ("Disconnected!"); beep (); // Beep beep! Made a boo-boo. // Let the user save the picture at least. // Also prevents us from trying to use the dead server handle. app->mode = NETWORK_MODE_STANDALONE; } static void on_server_hello (app_context_t *app, struct msg_unpacker *unpacker) { (void) app; uint8_t version; if (!msg_unpacker_u8 (unpacker, &version)) return; if (version != PROTOCOL_VERSION) // XXX: possibly incompatible version, disconnect? return; } static void on_server_get_bitmap (app_context_t *app, struct msg_unpacker *unpacker) { int32_t x, y; uint64_t w, h; if (!msg_unpacker_i32 (unpacker, &x) || !msg_unpacker_i32 (unpacker, &y) || !msg_unpacker_u64 (unpacker, &w) || !msg_unpacker_u64 (unpacker, &h)) return; // TODO: employ at least some RLE encoding size_t size = w * h * sizeof *app->bitmap; if ((h && w > SIZE_MAX / h) || w > SIZE_MAX || h > SIZE_MAX) return; const void *data; if (!msg_unpacker_blob (unpacker, &data, size)) return; free (app->bitmap); app->bitmap = memcpy (xcalloc (1, size), data, size); app->bitmap_x = x; app->bitmap_y = y; app->bitmap_w = w; app->bitmap_h = h; redraw_canvas (app); } static void on_server_put_point (app_context_t *app, struct msg_unpacker *unpacker) { int32_t x, y; uint8_t color; if (!msg_unpacker_i32 (unpacker, &x) || !msg_unpacker_i32 (unpacker, &y) || !msg_unpacker_u8 (unpacker, &color)) return; draw_point (app, x, y, color); } static void on_server_data (uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) { app_context_t *app = stream->loop->data; if (nread == UV_EOF || nread < 0) { on_server_disconnected (app); return; } msg_reader_feed (&app->msg_reader, buf->base, nread); static const server_handler_fn handlers[MESSAGE_COUNT] = { [MESSAGE_HELLO] = on_server_hello, [MESSAGE_GET_BITMAP] = on_server_get_bitmap, [MESSAGE_PUT_POINT] = on_server_put_point, }; void *msg; size_t len; while ((msg = msg_reader_get (&app->msg_reader, &len))) { struct msg_unpacker unpacker; msg_unpacker_init (&unpacker, msg, len); uint8_t type; if (!msg_unpacker_u8 (&unpacker, &type) || type >= MESSAGE_COUNT) // XXX: unknown message, disconnect? continue; server_handler_fn handler = handlers[type]; if (!handler) // XXX: unknown message, disconnect? continue; handler (app, &unpacker); if (msg_unpacker_get_available (&unpacker) > 0) // XXX: overlong message, disconnect? continue; } } // --- Server-specific stuff --------------------------------------------------- typedef bool (*client_handler_fn) (app_context_t *, client_t *, struct msg_unpacker *); static void remove_client (app_context_t *app, client_t *client) { // TODO: cancel any write requests? // XXX: should we unref it? uv_close ((uv_handle_t *) &client->handle, NULL); LIST_UNLINK (app->clients, client); msg_reader_free (&client->msg_reader); free (client); } static bool on_client_hello (app_context_t *app, client_t *client, struct msg_unpacker *unpacker) { (void) app; uint8_t version; if (!msg_unpacker_u8 (unpacker, &version) || version != PROTOCOL_VERSION) // Nope, I don't like you return false; send_hello_response (client); return true; } static bool on_client_get_bitmap (app_context_t *app, client_t *client, struct msg_unpacker *unpacker) { (void) unpacker; send_get_bitmap_response (client, app); return true; } static bool on_client_put_point (app_context_t *app, client_t *client, struct msg_unpacker *unpacker) { (void) client; int32_t x, y; uint8_t color; if (!msg_unpacker_i32 (unpacker, &x) || !msg_unpacker_i32 (unpacker, &y) || !msg_unpacker_u8 (unpacker, &color)) return false; // The function takes care of broadcasting to all the other clients, // as well as back to the original sender draw_point (app, x, y, color); return true; } static void on_client_data (uv_stream_t *stream, ssize_t nread, const uv_buf_t *buf) { app_context_t *app = stream->loop->data; client_t *client = stream->data; if (nread == UV_EOF || nread < 0) goto disconnect; // Connection closed or error msg_reader_feed (&client->msg_reader, buf->base, nread); static const client_handler_fn handlers[MESSAGE_COUNT] = { [MESSAGE_HELLO] = on_client_hello, [MESSAGE_GET_BITMAP] = on_client_get_bitmap, [MESSAGE_PUT_POINT] = on_client_put_point, }; void *msg; size_t len; while ((msg = msg_reader_get (&client->msg_reader, &len))) { struct msg_unpacker unpacker; msg_unpacker_init (&unpacker, msg, len); uint8_t type; if (!msg_unpacker_u8 (&unpacker, &type)) goto disconnect; // Invalid message if (type >= MESSAGE_COUNT) goto disconnect; // Unknown message client_handler_fn handler = handlers[type]; if (!handler) goto disconnect; // Unknown message if (!handler (app, client, &unpacker)) goto disconnect; // Invalid message if (msg_unpacker_get_available (&unpacker) > 0) goto disconnect; // Overlong message data } return; disconnect: remove_client (app, client); } static void on_new_client (uv_stream_t *server, int status) { app_context_t *app = server->loop->data; if (status) return; int err; client_t *client = xcalloc (1, sizeof *client); if ((err = uv_tcp_init (server->loop, &client->handle))) goto free_client; if ((err = uv_accept (server, (uv_stream_t *) &client->handle)) || (err = uv_read_start ((uv_stream_t *) &client->handle, app_uv_allocator, on_client_data))) // XXX: do we need to un-accept? goto free_handle; client->handle.data = client; msg_reader_init (&client->msg_reader); LIST_PREPEND (app->clients, client); return; free_handle: uv_close ((uv_handle_t *) &client->handle, NULL); // XXX: should we unref it? free_client: free (client); } // --- Program startup --------------------------------------------------------- typedef struct app_options app_options_t; struct app_options { struct addrinfo *client_address; ///< Address to connect to struct addrinfo *server_address; ///< Address to listen at }; static void app_options_init (app_options_t *self) { memset (self, 0, sizeof *self); } static void app_options_free (app_options_t *self) { if (self->client_address) freeaddrinfo (self->client_address); if (self->server_address) freeaddrinfo (self->server_address); } static struct addrinfo * parse_address (const char *address, int flags) { char address_copy[strlen (address) + 1]; strcpy (address_copy, address); char *colon = strrchr (address_copy, ':'); if (!colon) { fprintf (stderr, "error: no port number specified in `%s'\n", address); return false; } char *host = address_copy, *service = colon + 1; if (host == colon) host = NULL; else if (host < colon && *host == '[' && colon[-1] == ']') { // Remove IPv6 RFC 2732-style [] brackets from the host, if present. // This also makes it possible to take the usage string literally. :)) host++; colon[-1] = '\0'; } else *colon = '\0'; struct addrinfo *result, hints = { .ai_socktype = SOCK_STREAM, .ai_protocol = IPPROTO_TCP, .ai_flags = flags, }; int err = getaddrinfo (host, service, &hints, &result); if (err) { fprintf (stderr, "error: cannot resolve `%s', port `%s': %s\n", host, service, gai_strerror (err)); return false; } return result; } static void parse_program_arguments (app_options_t *options, int argc, char **argv) { static const struct opt opts[] = { { 'h', "help", NULL, 0, "display this help and exit" }, { 'V', "version", NULL, 0, "output version information and exit" }, { 's', "server", "[ADDRESS]:PORT", 0, "start a server" }, { 'c', "client", "[ADDRESS]:PORT", 0, "connect to a server" }, { 0, NULL, NULL, 0, NULL } }; struct opt_handler oh; opt_handler_init (&oh, argc, argv, opts, NULL, "Terminal drawing for NEET autists^Wartists"); int c; while ((c = opt_handler_get (&oh)) != -1) switch (c) { case 'h': opt_handler_usage (&oh, stdout); exit (EXIT_SUCCESS); case 'V': printf (PROJECT_NAME " " PROJECT_VERSION "\n"); exit (EXIT_SUCCESS); case 's': if (options->server_address) { fprintf (stderr, "%s: %s\n", "error", "cannot specify multiple listening addresses"); exit (EXIT_FAILURE); } if (!(options->server_address = parse_address (optarg, AI_PASSIVE))) exit (EXIT_FAILURE); break; case 'c': if (options->client_address) { fprintf (stderr, "%s: %s\n", "error", "cannot specify multiple addresses to connect to"); exit (EXIT_FAILURE); } if (!(options->client_address = parse_address (optarg, 0))) exit (EXIT_FAILURE); break; default: fprintf (stderr, "%s: %s\n", "error", "wrong options"); opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } if (options->client_address && options->server_address) { fprintf (stderr, "%s: %s\n", "error", "cannot be both a server and a client"); exit (EXIT_FAILURE); } argc -= optind; argv += optind; if (argc) { opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } opt_handler_free (&oh); } static void initialize_client (app_context_t *app, struct addrinfo *address) { app->mode = NETWORK_MODE_CLIENT; int sock_fd, err; for (; address; address = address->ai_next) { sock_fd = socket (address->ai_family, address->ai_socktype, address->ai_protocol); if (sock_fd == -1) continue; char host_buf[NI_MAXHOST], serv_buf[NI_MAXSERV]; err = getnameinfo (address->ai_addr, address->ai_addrlen, host_buf, sizeof host_buf, serv_buf, sizeof serv_buf, NI_NUMERICHOST | NI_NUMERICSERV); if (err) { fprintf (stderr, "%s: %s: %s\n", "error", "getnameinfo", gai_strerror (err)); fprintf (stderr, "connecting...\n"); } else { char *x = format_host_port_pair (host_buf, serv_buf); fprintf (stderr, "connecting to %s...\n", x); free (x); } if (!connect (sock_fd, address->ai_addr, address->ai_addrlen)) break; xclose (sock_fd); } if (!address) { fprintf (stderr, "%s: %s\n", "error", "connection failed"); exit (EXIT_FAILURE); } set_blocking (sock_fd, false); if ((err = uv_tcp_init (uv_default_loop (), &app->server_fd)) || (err = uv_tcp_open (&app->server_fd, sock_fd)) || (err = uv_tcp_keepalive (&app->server_fd, true, 30)) || (err = uv_read_start ((uv_stream_t *) &app->server_fd, app_uv_allocator, on_server_data))) { fprintf (stderr, "%s: %s: %s\n", "error", "initialization failed", uv_strerror (err)); exit (EXIT_FAILURE); } send_hello_request (app); send_get_bitmap_request (app); } static void initialize_server (app_context_t *app, struct addrinfo *address) { app->mode = NETWORK_MODE_SERVER; int err; if ((err = uv_tcp_init (uv_default_loop (), &app->listen_fd)) || (err = uv_tcp_bind (&app->listen_fd, address->ai_addr, 0)) || (err = uv_listen ((uv_stream_t *) &app->listen_fd, 10, on_new_client))) { fprintf (stderr, "%s: %s: %s\n", "error", "initialization failed", uv_strerror (err)); exit (EXIT_FAILURE); } } int main (int argc, char *argv[]) { TERMO_CHECK_VERSION; setlocale (LC_CTYPE, ""); app_context_t app; app_init (&app); app_options_t options; app_options_init (&options); parse_program_arguments (&options, argc, argv); if (options.client_address) initialize_client (&app, options.client_address); else if (options.server_address) initialize_server (&app, options.server_address); else app.mode = NETWORK_MODE_STANDALONE; app_options_free (&options); termo_t *tk = termo_new (STDIN_FILENO, NULL, 0); if (!tk) { fprintf (stderr, "%s: %s\n", "error", "cannot allocate termo instance\n"); exit (EXIT_FAILURE); } app.tk = tk; termo_set_mouse_proto (tk, termo_guess_mouse_proto (tk)); termo_set_mouse_tracking_mode (tk, TERMO_MOUSE_TRACKING_DRAG); // Set up curses for our drawing needs if (!initscr () || nonl () == ERR || curs_set (0) == ERR) { fprintf (stderr, "%s: %s\n", "error", "cannot initialize curses"); exit (EXIT_FAILURE); } uv_loop_t *loop = uv_default_loop (); loop->data = &app; uv_signal_init (loop, &app.winch_watcher); uv_signal_start (&app.winch_watcher, on_winch, SIGWINCH); uv_tty_init (loop, &app.tty, STDOUT_FILENO, false); uv_poll_init (loop, &app.tty_watcher, STDIN_FILENO); uv_poll_start (&app.tty_watcher, UV_READABLE, on_tty_readable); uv_timer_init (loop, &app.tty_timer); init_palette (&app); update_canvas_for_screen (&app); redraw (&app); redraw_canvas (&app); uv_run (loop, UV_RUN_DEFAULT); endwin (); app_free (&app); uv_loop_close (loop); return 0; }