/** ASCII Table Utility A simple utility that uses ncurses to display the ASCII table and lets you manually output ASCII characters one byte at a time. Use arrow keys or h/j/k/l to move, 'enter' to add a character to the output, and 'q' or escape to quit and print the output. Copyright 2018 Bruce Hill Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include #include #include #include #include // The descriptive names of the ASCII characters const char *NAMES[128][2] = { {"NUL", "null"}, // 0 {"SOH", "start of heading"}, // 1 {"STX", "start of text"}, // 2 {"ETX", "end of text"}, // 3 {"EOT", "end of transmission"}, // 4 {"ENQ", "enquiry"}, // 5 {"ACK", "acknowledge"}, // 6 {"BEL", "bell"}, // 7 {"BS", "backspace"}, // 8 {"TAB", "horizontal tab"}, // 9 {"LF", "NL line feed, new line"}, // 10 {"VT", "vertical tab"}, // 11 {"FF", "NP form feed, new page"}, // 12 {"CR", "carriage return"}, // 13 {"SO", "shift out"}, // 14 {"SI", "shift in"}, // 15 {"DLE", "data link escape"}, // 16 {"DC1", "device control 1"}, // 17 {"DC2", "device control 2"}, // 18 {"DC3", "device control 3"}, // 19 {"DC4", "device control 4"}, // 20 {"NAK", "negative acknowledge"}, // 21 {"SYN", "synchonous idle"}, // 22 {"ETB", "end of transmission block"}, // 23 {"CAN", "cancel"}, // 24 {"EM", "end of medium"}, // 25 {"SUB", "substitute"}, // 26 {"ESC", "escape"}, // 27 {"FS", "file separator"}, // 28 {"GS", "group separator"}, // 29 {"RS", "record separator"}, // 30 {"US", "unit separator"}, // 31 {" ", "space"}, // 32 [127] = {"DEL", "delete"} }; #define DECIMAL_COLOR 1 #define HEX_COLOR 2 #define CHAR_COLOR 3 #define DESCRIPTION_COLOR 4 #define OUTPUT_CHAR_COLOR 5 #define OUTPUT_ESCAPE_COLOR 6 const int COL_WIDTH = 42; int W = 0; int H = 0; // Draw the information for one character static inline void draw_char(int i) { int x = (i / (H-1)) * COL_WIDTH; int y = i % (H-1); color_set(DECIMAL_COLOR, NULL); mvprintw(y, x, "%3d ", i); x += 4; color_set(HEX_COLOR, NULL); mvprintw(y, x, " 0x%02X ", i); x += 6; color_set(CHAR_COLOR, NULL); if (NAMES[i][0]) { mvprintw(y, x, " %-3s ", NAMES[i][0]); } else { mvprintw(y, x, " %c ", i); } x += 5; if (NAMES[i][1]) { color_set(DESCRIPTION_COLOR, NULL); mvprintw(y, x, " %-25s", NAMES[i][1]); } } // Redraw the parts of the ASCII table necessary for the selected item static void redraw(int selected) { static int last_selected = -1; if (selected == last_selected) return; if (last_selected == -1) { for (int i = 0; i < 128; i++) { if (i == selected) attr_on(A_REVERSE, NULL); else attr_off(A_REVERSE, NULL); draw_char(i); } } else { attr_on(A_REVERSE, NULL); draw_char(selected); attr_off(A_REVERSE, NULL); draw_char(last_selected); } refresh(); last_selected = selected; } int main(int argc, char *argv[]) { if (argc >= 2) { for (int i = 1; i < argc; i++) { putc(atoi(argv[i]), stdout); } return 0; } size_t buf_size = 256, buf_i = 0; char *outbuf = calloc(buf_size, sizeof(char)); SCREEN *screen = newterm(NULL, stderr, stdin); set_term(screen); set_escdelay(5); W = getmaxx(stdscr); H = getmaxy(stdscr); noecho(); keypad(stdscr, 1); curs_set(0); start_color(); init_pair(DECIMAL_COLOR, COLOR_YELLOW, COLOR_BLACK); init_pair(HEX_COLOR, COLOR_GREEN, COLOR_BLACK); init_pair(CHAR_COLOR, COLOR_MAGENTA, COLOR_BLACK); init_pair(DESCRIPTION_COLOR, COLOR_WHITE, COLOR_BLACK); init_pair(OUTPUT_CHAR_COLOR, COLOR_BLACK, COLOR_WHITE); init_pair(OUTPUT_ESCAPE_COLOR, COLOR_RED, COLOR_WHITE); // Bar at the bottom of the screen showing the output text attr_on(A_BOLD, NULL); attr_on(A_REVERSE, NULL); mvprintw(H-1, 0, " Output:"); int output_x = 9; int selected = 0; while (1) { redraw(selected); int key = getch(); switch (key) { case 'j': case KEY_DOWN: selected++; break; case 'J': selected += 10; break; case 'k': case KEY_UP: selected--; break; case 'K': selected -= 10; break; case 'l': case 'L': case KEY_RIGHT: case KEY_SRIGHT: if (selected + H-1 < 128) selected += H-1; break; case 'h': case 'H': case KEY_LEFT: case KEY_SLEFT: if (selected - H-1 >= 0) selected -= H-1; break; case KEY_RESIZE: W = getmaxx(stdscr); H = getmaxy(stdscr); clear(); break; case KEY_ENTER: case '\n': outbuf[buf_i++] = (char)selected; if (buf_i >= buf_size) { buf_size *= 2; outbuf = realloc(outbuf, buf_size); } if (' ' <= selected && selected <= '~') { // printable range color_set(OUTPUT_CHAR_COLOR, NULL); mvprintw(H-1, output_x++, "%c", selected); } else { color_set(OUTPUT_ESCAPE_COLOR, NULL); mvprintw(H-1, output_x, "\\x%02X", selected); output_x += 4; } break; case 'q': case 'Q': case KEY_CANCEL: case KEY_CLOSE: case KEY_EXIT: case 27: endwin(); write(1, outbuf, buf_i); return 0; } if (selected < 0) selected = 0; if (selected >= 128) selected = 127; } endwin(); return 0; }