/* * hex -- hex viewer * * Copyright (c) 2016, 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 "config.h" // We "need" to have an enum for attributes before including liberty. // Avoiding colours in the defaults here in order to support dumb terminals. #define ATTRIBUTE_TABLE(XX) \ XX( FOOTER, "footer", -1, -1, 0 ) \ XX( HIGHLIGHT, "highlight", -1, -1, A_BOLD ) \ /* Bar */ \ XX( BAR, "bar", -1, -1, A_REVERSE ) \ XX( BAR_ACTIVE, "bar_active", -1, -1, A_REVERSE | A_BOLD ) \ /* View */ \ XX( EVEN, "even", -1, -1, 0 ) \ XX( ODD, "odd", -1, -1, 0 ) \ XX( SELECTION, "selection", -1, -1, A_REVERSE ) \ /* These are for debugging only */ \ XX( WARNING, "warning", 3, -1, 0 ) \ XX( ERROR, "error", 1, -1, 0 ) enum { #define XX(name, config, fg_, bg_, attrs_) ATTRIBUTE_ ## name, ATTRIBUTE_TABLE (XX) #undef XX ATTRIBUTE_COUNT }; // User data for logger functions to enable formatted logging #define print_fatal_data ((void *) ATTRIBUTE_ERROR) #define print_error_data ((void *) ATTRIBUTE_ERROR) #define print_warning_data ((void *) ATTRIBUTE_WARNING) #define LIBERTY_WANT_POLLER #define LIBERTY_WANT_ASYNC #define LIBERTY_WANT_PROTO_HTTP #include "liberty/liberty.c" #include #include #ifndef TIOCGWINSZ #include #endif // ! TIOCGWINSZ #include "tui.c" #include "termo.h" #define APP_TITLE PROGRAM_NAME ///< Left top corner // --- Utilities --------------------------------------------------------------- // The standard endwin/refresh sequence makes the terminal flicker static void update_curses_terminal_size (void) { #if defined (HAVE_RESIZETERM) && defined (TIOCGWINSZ) struct winsize size; if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size)) { char *row = getenv ("LINES"); char *col = getenv ("COLUMNS"); unsigned long tmp; resizeterm ( (row && xstrtoul (&tmp, row, 10)) ? tmp : size.ws_row, (col && xstrtoul (&tmp, col, 10)) ? tmp : size.ws_col); } #else // HAVE_RESIZETERM && TIOCGWINSZ endwin (); refresh (); #endif // HAVE_RESIZETERM && TIOCGWINSZ } // --- Application ------------------------------------------------------------- enum { ROW_SIZE = 16, ///< How many bytes on a row FOOTER_SIZE = 4, ///< How many rows form the footer }; enum endianity { ENDIANITY_LE, ///< Little endian ENDIANITY_BE ///< Big endian }; static struct app_context { // Event loop: struct poller poller; ///< Poller bool quitting; ///< Quit signal for the event loop bool polling; ///< The event loop is running struct poller_fd tty_event; ///< Terminal input event struct poller_fd signal_event; ///< Signal FD event // Data: struct config config; ///< Program configuration char *filename; ///< Target filename uint8_t *data; ///< Target data int64_t data_len; ///< Length of the data int64_t data_offset; ///< Offset of the data within the file // View: int64_t view_top; ///< Offset of the top of the screen int64_t view_cursor; ///< Offset of the cursor bool view_skip_nibble; ///< Half-byte offset enum endianity endianity; ///< Endianity // Emulated widgets: struct poller_idle refresh_event; ///< Refresh the screen // Terminal: termo_t *tk; ///< termo handle struct poller_timer tk_timer; ///< termo timeout timer bool locale_is_utf8; ///< The locale is Unicode struct attrs attrs[ATTRIBUTE_COUNT]; } g_ctx; /// Shortcut to retrieve named terminal attributes #define APP_ATTR(name) g_ctx.attrs[ATTRIBUTE_ ## name].attrs // --- Configuration ----------------------------------------------------------- static struct config_schema g_config_colors[] = { #define XX(name_, config, fg_, bg_, attrs_) \ { .name = config, .type = CONFIG_ITEM_STRING }, ATTRIBUTE_TABLE (XX) #undef XX {} }; static const char * get_config_string (struct config_item *root, const char *key) { struct config_item *item = config_item_get (root, key, NULL); hard_assert (item); if (item->type == CONFIG_ITEM_NULL) return NULL; hard_assert (config_item_type_is_string (item->type)); return item->value.string.str; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static void load_config_colors (struct config_item *subtree, void *user_data) { config_schema_apply_to_object (g_config_colors, subtree, user_data); // The attributes cannot be changed dynamically right now, so it doesn't // make much sense to make use of "on_change" callbacks either. // For simplicity, we should reload the entire table on each change anyway. const char *value; #define XX(name, config, fg_, bg_, attrs_) \ if ((value = get_config_string (subtree, config))) \ g_ctx.attrs[ATTRIBUTE_ ## name] = attrs_decode (value); ATTRIBUTE_TABLE (XX) #undef XX } static void app_load_configuration (void) { struct config *config = &g_ctx.config; config_register_module (config, "colors", load_config_colors, NULL); // Bootstrap configuration, so that we can access schema items at all config_load (config, config_item_object ()); char *filename = resolve_filename (PROGRAM_NAME ".conf", resolve_relative_config_filename); if (!filename) return; struct error *e = NULL; struct config_item *root = config_read_from_file (filename, &e); free (filename); if (e) { print_error ("error loading configuration: %s", e->message); error_free (e); exit (EXIT_FAILURE); } if (root) { config_load (&g_ctx.config, root); config_schema_call_changed (g_ctx.config.root); } } // --- Application ------------------------------------------------------------- static void app_init_attributes (void) { #define XX(name, config, fg_, bg_, attrs_) \ g_ctx.attrs[ATTRIBUTE_ ## name].fg = fg_; \ g_ctx.attrs[ATTRIBUTE_ ## name].bg = bg_; \ g_ctx.attrs[ATTRIBUTE_ ## name].attrs = attrs_; ATTRIBUTE_TABLE (XX) #undef XX } static void app_init_context (void) { poller_init (&g_ctx.poller); config_init (&g_ctx.config); // This is also approximately what libunistring does internally, // since the locale name is canonicalized by locale_charset(). // Note that non-Unicode locales are handled pretty inefficiently. g_ctx.locale_is_utf8 = !strcasecmp_ascii (locale_charset (), "UTF-8"); app_init_attributes (); } static void app_init_terminal (void) { TERMO_CHECK_VERSION; if (!(g_ctx.tk = termo_new (STDIN_FILENO, NULL, 0))) abort (); if (!initscr () || nonl () == ERR || curs_set (1) == ERR) abort (); // By default we don't use any colors so they're not required... if (start_color () == ERR || use_default_colors () == ERR || COLOR_PAIRS <= ATTRIBUTE_COUNT) return; for (int a = 0; a < ATTRIBUTE_COUNT; a++) { // ...thus we can reset back to defaults even after initializing some if (g_ctx.attrs[a].fg >= COLORS || g_ctx.attrs[a].fg < -1 || g_ctx.attrs[a].bg >= COLORS || g_ctx.attrs[a].bg < -1) { app_init_attributes (); return; } init_pair (a + 1, g_ctx.attrs[a].fg, g_ctx.attrs[a].bg); g_ctx.attrs[a].attrs |= COLOR_PAIR (a + 1); } } static void app_free_context (void) { config_free (&g_ctx.config); poller_free (&g_ctx.poller); free (g_ctx.filename); free (g_ctx.data); if (g_ctx.tk) termo_destroy (g_ctx.tk); } static void app_quit (void) { g_ctx.quitting = true; g_ctx.polling = false; } static bool app_is_character_in_locale (ucs4_t ch) { // Avoid the overhead joined with calling iconv() for all characters. if (g_ctx.locale_is_utf8) return true; // The library really creates a new conversion object every single time // and doesn't provide any smarter APIs. Luckily, most users use UTF-8. size_t len; char *tmp = u32_conv_to_encoding (locale_charset (), iconveh_error, &ch, 1, NULL, NULL, &len); if (!tmp) return false; free (tmp); return true; } // --- Rendering --------------------------------------------------------------- static void app_invalidate (void) { poller_idle_set (&g_ctx.refresh_event); } static void app_flush_buffer (struct row_buffer *buf, int width, chtype attrs) { row_buffer_align (buf, width, attrs); row_buffer_flush (buf); row_buffer_free (buf); } /// Write the given UTF-8 string padded with spaces. /// @param[in] attrs Text attributes for the text, including padding. static void app_write_line (const char *str, chtype attrs) { struct row_buffer buf; row_buffer_init (&buf); row_buffer_append (&buf, str, attrs); app_flush_buffer (&buf, COLS, attrs); } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static int app_visible_items (void) { return MAX (0, LINES - FOOTER_SIZE); } static void app_draw_view (void) { int64_t end_addr = g_ctx.data_offset + g_ctx.data_len; for (int y = 0; y < app_visible_items (); y++) { int64_t row_addr = g_ctx.view_top + y * ROW_SIZE; if (row_addr >= end_addr) break; int row_attrs = (row_addr / ROW_SIZE & 1) ? APP_ATTR (ODD) : APP_ATTR (EVEN); struct row_buffer buf; row_buffer_init (&buf); char *row_addr_str = xstrdup_printf ("%08" PRIx64, row_addr); row_buffer_append (&buf, row_addr_str, row_attrs); free (row_addr_str); struct str ascii; str_init (&ascii); str_append (&ascii, " "); for (int x = 0; x < ROW_SIZE; x++) { if (x % 8 == 0) row_buffer_append (&buf, " ", row_attrs); if (x % 2 == 0) row_buffer_append (&buf, " ", row_attrs); int64_t cell_addr = row_addr + x; if (cell_addr < g_ctx.data_offset || cell_addr >= end_addr) { row_buffer_append (&buf, " ", row_attrs); str_append_c (&ascii, ' '); } else { uint8_t cell = g_ctx.data[cell_addr - g_ctx.data_offset]; char *hex = xstrdup_printf ("%02x", cell); row_buffer_append (&buf, hex, row_attrs); free (hex); if (cell >= 32 && cell < 127) str_append_c (&ascii, cell); else str_append_c (&ascii, '.'); } } row_buffer_append (&buf, ascii.str, row_attrs); str_free (&ascii); move (y, 0); app_flush_buffer (&buf, COLS, row_attrs); } } static void app_draw_footer (void) { move (app_visible_items (), 0); // XXX: can we get rid of this and still make it look acceptable? chtype a_normal = APP_ATTR (BAR); chtype a_active = APP_ATTR (BAR_ACTIVE); struct row_buffer buf; row_buffer_init (&buf); row_buffer_append (&buf, APP_TITLE, a_normal); if (g_ctx.filename) { row_buffer_append (&buf, " ", a_normal); char *filename = (char *) u8_strconv_from_locale (g_ctx.filename); row_buffer_append (&buf, filename, a_active); free (filename); } struct str right; str_init (&right); str_append_printf (&right, "%08" PRIx64 " ", g_ctx.view_cursor); str_append_printf (&right, "%s ", g_ctx.endianity == ENDIANITY_LE ? "LE" : "BE"); int64_t top = g_ctx.view_top; int64_t bot = g_ctx.view_top + app_visible_items () * ROW_SIZE; if (top <= g_ctx.data_offset && bot > g_ctx.data_offset + g_ctx.data_len) str_append (&right, "All"); else if (top <= g_ctx.data_offset) str_append (&right, "Top"); else if (bot > g_ctx.data_offset + g_ctx.data_len) str_append (&right, "Bot"); else // TODO: position indication in percents str_append (&right, "??%"); row_buffer_align (&buf, COLS - right.len, a_normal); row_buffer_append (&buf, right.str, a_normal); app_flush_buffer (&buf, COLS, a_normal); int64_t end_addr = g_ctx.data_offset + g_ctx.data_len; if (g_ctx.view_cursor < g_ctx.data_offset || g_ctx.view_cursor >= end_addr) return; struct str x; str_init (&x); struct str u; str_init (&u); struct str s; str_init (&s); int64_t len = end_addr - g_ctx.view_cursor; uint8_t *p = g_ctx.data + (g_ctx.view_cursor - g_ctx.data_offset); // TODO: make the headers bold const char *coding = g_ctx.endianity == ENDIANITY_LE ? "le" : "be"; uint64_t val; if (len >= 1) { str_append_printf (&x, "x8 %02x", (uint8_t) p[0]); str_append_printf (&u, "u8 %4u", (uint8_t) p[0]); str_append_printf (&s, "s8 %4d", (int8_t) p[0]); } if (len >= 2) { if (g_ctx.endianity == ENDIANITY_BE) val = p[1] | p[0] << 8; else val = p[0] | p[1] << 8; str_append_printf (&x, " x16%s %04x", coding, (uint16_t) val); str_append_printf (&u, " u16%s %6u", coding, (uint16_t) val); str_append_printf (&s, " s16%s %6d", coding, (int16_t) val); } if (len >= 4) { if (g_ctx.endianity == ENDIANITY_BE) val = p[3] | p[2] << 8 | p[1] << 16 | p[0] << 24; else val = p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24; str_append_printf (&x, " x32%s %08x", coding, (uint32_t) val); str_append_printf (&u, " u32%s %11u", coding, (uint32_t) val); str_append_printf (&s, " s32%s %11d", coding, (int32_t) val); } if (len >= 8) { if (g_ctx.endianity == ENDIANITY_BE) val = (uint64_t) p[7] | (uint64_t) p[6] << 8 | (uint64_t) p[5] << 16 | (uint64_t) p[4] << 24 | (uint64_t) p[3] << 32 | (uint64_t) p[2] << 40 | (uint64_t) p[1] << 48 | (uint64_t) p[0] << 56; else val = (uint64_t) p[0] | (uint64_t) p[1] << 8 | (uint64_t) p[2] << 16 | (uint64_t) p[3] << 24 | (uint64_t) p[4] << 32 | (uint64_t) p[5] << 40 | (uint64_t) p[6] << 48 | (uint64_t) p[7] << 56; str_append_printf (&x, " x64%s %016" PRIx64, coding, val); str_append_printf (&u, " u64%s %20" PRIu64, coding, val); str_append_printf (&s, " s64%s %20" PRId64, coding, (int64_t) val); } app_write_line (x.str, APP_ATTR (FOOTER)); app_write_line (u.str, APP_ATTR (FOOTER)); app_write_line (s.str, APP_ATTR (FOOTER)); str_free (&x); str_free (&u); str_free (&s); } static void app_on_refresh (void *user_data) { (void) user_data; poller_idle_reset (&g_ctx.refresh_event); erase (); app_draw_view (); app_draw_footer (); int64_t diff = g_ctx.view_cursor - g_ctx.view_top; int y = diff / ROW_SIZE; int x = diff % ROW_SIZE; move (y, 10 + x*2 + g_ctx.view_skip_nibble + x/8 + x/2); refresh (); } // --- Actions ----------------------------------------------------------------- /// Checks what items are visible and returns if fixes were needed static bool app_fix_view_range (void) { if (g_ctx.view_top < g_ctx.data_offset / ROW_SIZE * ROW_SIZE) { g_ctx.view_top = g_ctx.data_offset / ROW_SIZE * ROW_SIZE; app_invalidate (); return false; } // If the contents are at least as long as the screen, always fill it int64_t max_view_top = ((g_ctx.data_offset + g_ctx.data_len - 1) / ROW_SIZE - app_visible_items () + 1) * ROW_SIZE; // But don't let that suggest a negative offset max_view_top = MAX (max_view_top, 0); if (g_ctx.view_top > max_view_top) { g_ctx.view_top = max_view_top; app_invalidate (); return false; } return true; } /// Scroll down (positive) or up (negative) @a n items static bool app_scroll (int n) { g_ctx.view_top += n * ROW_SIZE; app_invalidate (); return app_fix_view_range (); } static void app_ensure_selection_visible (void) { int too_high = g_ctx.view_top / ROW_SIZE - g_ctx.view_cursor / ROW_SIZE; if (too_high > 0) app_scroll (-too_high); int too_low = g_ctx.view_cursor / ROW_SIZE - (g_ctx.view_top / ROW_SIZE + app_visible_items () - 1); if (too_low > 0) app_scroll (too_low); } static bool app_move_selection (int diff) { // TODO: disallow partial up/down movement int64_t fixed = g_ctx.view_cursor += diff * ROW_SIZE; fixed = MAX (fixed, g_ctx.data_offset); fixed = MIN (fixed, g_ctx.data_offset + g_ctx.data_len - 1); bool result = g_ctx.view_cursor != fixed; g_ctx.view_cursor = fixed; app_invalidate (); app_ensure_selection_visible (); return result; } // --- User input handling ----------------------------------------------------- enum action { ACTION_NONE, ACTION_QUIT, ACTION_REDRAW, ACTION_TOGGLE_ENDIANITY, ACTION_SCROLL_UP, ACTION_SCROLL_DOWN, ACTION_GOTO_TOP, ACTION_GOTO_BOTTOM, ACTION_GOTO_PAGE_PREVIOUS, ACTION_GOTO_PAGE_NEXT, ACTION_UP, ACTION_DOWN, ACTION_LEFT, ACTION_RIGHT, ACTION_COUNT }; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static bool app_process_action (enum action action) { switch (action) { case ACTION_QUIT: app_quit (); break; case ACTION_REDRAW: clear (); app_invalidate (); break; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - case ACTION_TOGGLE_ENDIANITY: g_ctx.endianity = (g_ctx.endianity == ENDIANITY_LE) ? ENDIANITY_BE : ENDIANITY_LE; app_invalidate (); break; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // XXX: these should rather be parametrized case ACTION_SCROLL_UP: app_scroll (-1); break; case ACTION_SCROLL_DOWN: app_scroll (1); break; case ACTION_GOTO_TOP: g_ctx.view_cursor = g_ctx.data_offset; g_ctx.view_skip_nibble = false; app_ensure_selection_visible (); app_invalidate (); break; case ACTION_GOTO_BOTTOM: if (!g_ctx.data_len) break; g_ctx.view_cursor = g_ctx.data_offset + g_ctx.data_len - 1; g_ctx.view_skip_nibble = false; app_ensure_selection_visible (); app_invalidate (); break; case ACTION_GOTO_PAGE_PREVIOUS: app_scroll (FOOTER_SIZE - LINES); app_move_selection (FOOTER_SIZE - LINES); break; case ACTION_GOTO_PAGE_NEXT: app_scroll (LINES - FOOTER_SIZE); app_move_selection (LINES - FOOTER_SIZE); break; case ACTION_UP: app_move_selection (-1); break; case ACTION_DOWN: app_move_selection (1); break; case ACTION_LEFT: if (g_ctx.view_skip_nibble) g_ctx.view_skip_nibble = false; else { if (g_ctx.view_cursor <= g_ctx.data_offset) return false; g_ctx.view_skip_nibble = true; g_ctx.view_cursor--; } app_ensure_selection_visible (); app_invalidate (); break; case ACTION_RIGHT: if (!g_ctx.view_skip_nibble) g_ctx.view_skip_nibble = true; else { if (g_ctx.view_cursor >= g_ctx.data_offset + g_ctx.data_len - 1) return false; g_ctx.view_skip_nibble = false; g_ctx.view_cursor++; } app_ensure_selection_visible (); app_invalidate (); break; // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - case ACTION_NONE: break; default: beep (); return false; } return true; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static bool app_process_left_mouse_click (int line, int column) { if (line == app_visible_items ()) { if (column < COLS - 7 || column >= COLS - 5) return false; // TODO: LE/BE switch } else if (line < app_visible_items ()) { if (line < 0) return false; // TODO: convert and check "column" if (column < 10 || column >= 50) return false; int offset = column - 10; offset -= offset/5 + offset/21; g_ctx.view_skip_nibble = (offset & 1) == 1; g_ctx.view_cursor = g_ctx.view_top + line * ROW_SIZE + offset / 2; return app_move_selection (0); } return true; } static bool app_process_mouse (termo_mouse_event_t type, int line, int column, int button) { if (type != TERMO_MOUSE_PRESS) return true; if (button == 1) return app_process_left_mouse_click (line, column); else if (button == 4) return app_process_action (ACTION_SCROLL_UP); else if (button == 5) return app_process_action (ACTION_SCROLL_DOWN); return false; } // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - static struct binding { const char *key; ///< Key definition enum action action; ///< Action to take } g_default_bindings[] = { { "Escape", ACTION_QUIT }, { "q", ACTION_QUIT }, { "C-l", ACTION_REDRAW }, { "Tab", ACTION_TOGGLE_ENDIANITY }, { "Home", ACTION_GOTO_TOP }, { "End", ACTION_GOTO_BOTTOM }, { "M-<", ACTION_GOTO_TOP }, { "M->", ACTION_GOTO_BOTTOM }, { "PageUp", ACTION_GOTO_PAGE_PREVIOUS }, { "PageDown", ACTION_GOTO_PAGE_NEXT }, { "C-b", ACTION_GOTO_PAGE_PREVIOUS }, { "C-f", ACTION_GOTO_PAGE_NEXT }, { "Up", ACTION_UP }, { "Down", ACTION_DOWN }, { "Left", ACTION_LEFT }, { "Right", ACTION_RIGHT }, { "k", ACTION_UP }, { "j", ACTION_DOWN }, { "h", ACTION_LEFT }, { "l", ACTION_RIGHT }, { "C-p", ACTION_UP }, { "C-n", ACTION_DOWN }, { "C-y", ACTION_SCROLL_UP }, { "C-e", ACTION_SCROLL_DOWN }, }; static bool app_process_termo_event (termo_key_t *event) { // TODO: pre-parse the keys, order them by termo_keycmp() and binary search for (size_t i = 0; i < N_ELEMENTS (g_default_bindings); i++) { struct binding *binding = &g_default_bindings[i]; termo_key_t key; hard_assert (!*termo_strpkey_utf8 (g_ctx.tk, binding->key, &key, TERMO_FORMAT_ALTISMETA)); if (!termo_keycmp (g_ctx.tk, event, &key)) return app_process_action (binding->action); } // TODO: use 0-9 a-f to overwrite nibbles return false; } // --- Signals ----------------------------------------------------------------- static int g_signal_pipe[2]; ///< A pipe used to signal... signals /// Program termination has been requested by a signal static volatile sig_atomic_t g_termination_requested; /// The window has changed in size static volatile sig_atomic_t g_winch_received; static void signals_postpone_handling (char id) { int original_errno = errno; if (write (g_signal_pipe[1], &id, 1) == -1) soft_assert (errno == EAGAIN); errno = original_errno; } static void signals_superhandler (int signum) { switch (signum) { case SIGWINCH: g_winch_received = true; signals_postpone_handling ('w'); break; case SIGINT: case SIGTERM: g_termination_requested = true; signals_postpone_handling ('t'); break; default: hard_assert (!"unhandled signal"); } } static void signals_setup_handlers (void) { if (pipe (g_signal_pipe) == -1) exit_fatal ("%s: %s", "pipe", strerror (errno)); set_cloexec (g_signal_pipe[0]); set_cloexec (g_signal_pipe[1]); // So that the pipe cannot overflow; it would make write() block within // the signal handler, which is something we really don't want to happen. // The same holds true for read(). set_blocking (g_signal_pipe[0], false); set_blocking (g_signal_pipe[1], false); signal (SIGPIPE, SIG_IGN); struct sigaction sa; sa.sa_flags = SA_RESTART; sa.sa_handler = signals_superhandler; sigemptyset (&sa.sa_mask); if (sigaction (SIGWINCH, &sa, NULL) == -1 || sigaction (SIGINT, &sa, NULL) == -1 || sigaction (SIGTERM, &sa, NULL) == -1) exit_fatal ("sigaction: %s", strerror (errno)); } // --- Initialisation, event handling ------------------------------------------ static void app_on_tty_readable (const struct pollfd *fd, void *user_data) { (void) user_data; if (fd->revents & ~(POLLIN | POLLHUP | POLLERR)) print_debug ("fd %d: unexpected revents: %d", fd->fd, fd->revents); poller_timer_reset (&g_ctx.tk_timer); termo_advisereadable (g_ctx.tk); termo_key_t event; termo_result_t res; while ((res = termo_getkey (g_ctx.tk, &event)) == TERMO_RES_KEY) { int y, x, button; termo_mouse_event_t type; if (termo_interpret_mouse (g_ctx.tk, &event, &type, &button, &y, &x)) { if (!app_process_mouse (type, y, x, button)) beep (); } else if (!app_process_termo_event (&event)) beep (); } if (res == TERMO_RES_AGAIN) poller_timer_set (&g_ctx.tk_timer, termo_get_waittime (g_ctx.tk)); else if (res == TERMO_RES_ERROR || res == TERMO_RES_EOF) app_quit (); } static void app_on_key_timer (void *user_data) { (void) user_data; termo_key_t event; if (termo_getkey_force (g_ctx.tk, &event) == TERMO_RES_KEY) if (!app_process_termo_event (&event)) app_quit (); } static void app_on_signal_pipe_readable (const struct pollfd *fd, void *user_data) { (void) user_data; char id = 0; (void) read (fd->fd, &id, 1); if (g_termination_requested && !g_ctx.quitting) app_quit (); if (g_winch_received) { update_curses_terminal_size (); app_fix_view_range (); app_invalidate (); g_winch_received = false; } } static void app_log_handler (void *user_data, const char *quote, const char *fmt, va_list ap) { // We certainly don't want to end up in a possibly infinite recursion static bool in_processing; if (in_processing) return; in_processing = true; struct str message; str_init (&message); str_append (&message, quote); str_append_vprintf (&message, fmt, ap); // If the standard error output isn't redirected, try our best at showing // the message to the user if (!isatty (STDERR_FILENO)) fprintf (stderr, "%s\n", message.str); else { // TODO: think of a location to print this, maybe over decoding fields // TODO: remember the position and restore it move (LINES - 1, 0); app_write_line (message.str, A_REVERSE); } str_free (&message); in_processing = false; } static void app_init_poller_events (void) { poller_fd_init (&g_ctx.signal_event, &g_ctx.poller, g_signal_pipe[0]); g_ctx.signal_event.dispatcher = app_on_signal_pipe_readable; poller_fd_set (&g_ctx.signal_event, POLLIN); poller_fd_init (&g_ctx.tty_event, &g_ctx.poller, STDIN_FILENO); g_ctx.tty_event.dispatcher = app_on_tty_readable; poller_fd_set (&g_ctx.tty_event, POLLIN); poller_timer_init (&g_ctx.tk_timer, &g_ctx.poller); g_ctx.tk_timer.dispatcher = app_on_key_timer; poller_idle_init (&g_ctx.refresh_event, &g_ctx.poller); g_ctx.refresh_event.dispatcher = app_on_refresh; } /// Decode size arguments according to similar rules to those that dd(1) uses; /// we support octal and hexadecimal numbers but they clash with suffixes static bool decode_size (const char *s, int64_t *out) { char *end; errno = 0; int64_t n = strtol (s, &end, 0); if (errno != 0 || end == s || n < 0) return false; int64_t f = 1; switch (*end) { case 'c': f = 1 << 0; end++; break; case 'w': f = 1 << 1; end++; break; case 'b': f = 1 << 9; end++; break; case 'K': f = 1 << 10; if (*++end == 'B') { f = 1e3; end++; } break; case 'M': f = 1 << 20; if (*++end == 'B') { f = 1e6; end++; } break; case 'G': f = 1 << 30; if (*++end == 'B') { f = 1e9; end++; } break; } if (*end || n > INT64_MAX / f) return false; *out = n * f; return true; } int main (int argc, char *argv[]) { static const struct opt opts[] = { { 'd', "debug", NULL, 0, "run in debug mode" }, { 'h', "help", NULL, 0, "display this help and exit" }, { 'V', "version", NULL, 0, "output version information and exit" }, { 'o', "offset", NULL, 0, "offset within the file" }, { 's', "size", NULL, 0, "size limit (1G by default)" }, { 0, NULL, NULL, 0, NULL } }; struct opt_handler oh; opt_handler_init (&oh, argc, argv, opts, "[FILE]", "Hex viewer."); int64_t size_limit = 1 << 30; int c; while ((c = opt_handler_get (&oh)) != -1) switch (c) { case 'd': g_debug_mode = true; break; case 'h': opt_handler_usage (&oh, stdout); exit (EXIT_SUCCESS); case 'V': printf (PROGRAM_NAME " " PROGRAM_VERSION "\n"); exit (EXIT_SUCCESS); case 'o': if (!decode_size (optarg, &g_ctx.data_offset)) exit_fatal ("invalid offset specified"); break; case 's': if (!decode_size (optarg, &size_limit)) exit_fatal ("invalid size limit specified"); break; default: print_error ("wrong options"); opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } argc -= optind; argv += optind; // When no filename is given, read from stdin and replace it with the tty int input_fd; if (argc == 0) { if ((input_fd = dup (STDIN_FILENO)) < 0) exit_fatal ("cannot read input: %s", strerror (errno)); close (STDIN_FILENO); if (open ("/dev/tty", O_RDWR)) exit_fatal ("cannot open the terminal: %s", strerror (errno)); } else if (argc == 1) { g_ctx.filename = xstrdup (argv[0]); if (!(input_fd = open (argv[0], O_RDONLY))) exit_fatal ("cannot open `%s': %s", argv[0], strerror (errno)); } else { opt_handler_usage (&oh, stderr); exit (EXIT_FAILURE); } opt_handler_free (&oh); // Seek in the file or pipe however we can static char seek_buf[8192]; if (lseek (input_fd, g_ctx.data_offset, SEEK_SET) == (off_t) -1) for (uint64_t remaining = g_ctx.data_offset; remaining; ) { ssize_t n_read = read (input_fd, seek_buf, MIN (remaining, sizeof seek_buf)); if (n_read <= 0) exit_fatal ("cannot seek: %s", strerror (errno)); remaining -= n_read; } // Read up to "size_limit" bytes of data into a buffer struct str buf; str_init (&buf); while (buf.len < (size_t) size_limit) { str_ensure_space (&buf, 8192); ssize_t n_read = read (input_fd, buf.str + buf.len, MIN (size_limit - buf.len, buf.alloc - buf.len)); if (!n_read) break; if (n_read == -1) exit_fatal ("cannot read input: %s", strerror (errno)); buf.len += n_read; } g_ctx.data = (uint8_t *) buf.str; g_ctx.data_len = buf.len; g_ctx.view_top = g_ctx.data_offset / ROW_SIZE * ROW_SIZE; g_ctx.view_cursor = g_ctx.data_offset; // We only need to convert to and from the terminal encoding if (!setlocale (LC_CTYPE, "")) print_warning ("failed to set the locale"); app_init_context (); app_load_configuration (); app_init_terminal (); signals_setup_handlers (); app_init_poller_events (); app_invalidate (); // Redirect all messages from liberty so that they don't disrupt display g_log_message_real = app_log_handler; g_ctx.polling = true; while (g_ctx.polling) poller_run (&g_ctx.poller); endwin (); g_log_message_real = log_message_stdio; app_free_context (); return 0; }