Initial commit.
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a5fa886a6f
18
Makefile
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18
Makefile
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CC=gcc
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PREFIX=/usr/local
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LIBS=-lncurses
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all: build
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clean:
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rm ascii
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ascii: ascii.c
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$(CC) ascii.c $(LIBS) -o ascii
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build: ascii
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install: ascii
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install -d $(PREFIX)/bin
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install -m 755 ascii $(PREFIX)/bin
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228
ascii.c
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ascii.c
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/**
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ASCII Table Utility
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A simple utility that uses ncurses to display the ASCII table and lets you
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manually output ASCII characters one byte at a time. Use arrow keys or
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h/j/k/l to move, 'enter' to add a character to the output, and 'q' or escape
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to quit and print the output.
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Copyright 2018 Bruce Hill
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <curses.h>
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#include <unistd.h>
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#include <ncurses.h>
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// The descriptive names of the ASCII characters
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const char *NAMES[128][2] = {
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{"NUL", "null"}, // 0
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{"SOH", "start of heading"}, // 1
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{"STX", "start of text"}, // 2
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{"ETX", "end of text"}, // 3
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{"EOT", "end of transmission"}, // 4
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{"ENQ", "enquiry"}, // 5
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{"ACK", "acknowledge"}, // 6
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{"BEL", "bell"}, // 7
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{"BS", "backspace"}, // 8
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{"TAB", "horizontal tab"}, // 9
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{"LF", "NL line feed, new line"}, // 10
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{"VT", "vertical tab"}, // 11
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{"FF", "NP form feed, new page"}, // 12
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{"CR", "carriage return"}, // 13
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{"SO", "shift out"}, // 14
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{"SI", "shift in"}, // 15
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{"DLE", "data link escape"}, // 16
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{"DC1", "device control 1"}, // 17
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{"DC2", "device control 2"}, // 18
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{"DC3", "device control 3"}, // 19
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{"DC4", "device control 4"}, // 20
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{"NAK", "negative acknowledge"}, // 21
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{"SYN", "synchonous idle"}, // 22
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{"ETB", "end of transmission block"}, // 23
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{"CAN", "cancel"}, // 24
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{"EM", "end of medium"}, // 25
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{"SUB", "substitute"}, // 26
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{"ESC", "escape"}, // 27
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{"FS", "file separator"}, // 28
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{"GS", "group separator"}, // 29
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{"RS", "record separator"}, // 30
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{"US", "unit separator"}, // 31
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{" ", "space"}, // 32
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[127] = {"DEL", "delete"}
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};
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#define DECIMAL_COLOR 1
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#define HEX_COLOR 2
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#define CHAR_COLOR 3
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#define DESCRIPTION_COLOR 4
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#define OUTPUT_CHAR_COLOR 5
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#define OUTPUT_ESCAPE_COLOR 6
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const int COL_WIDTH = 42;
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int W = 0;
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int H = 0;
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// Draw the information for one character
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static inline void draw_char(int i)
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{
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int x = (i / (H-1)) * COL_WIDTH;
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int y = i % (H-1);
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color_set(DECIMAL_COLOR, NULL);
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mvprintw(y, x, "%3d ", i);
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x += 4;
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color_set(HEX_COLOR, NULL);
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mvprintw(y, x, " 0x%02X ", i);
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x += 6;
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color_set(CHAR_COLOR, NULL);
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if (NAMES[i][0]) {
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mvprintw(y, x, " %-3s ", NAMES[i][0]);
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} else {
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mvprintw(y, x, " %c ", i);
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}
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x += 5;
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if (NAMES[i][1]) {
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color_set(DESCRIPTION_COLOR, NULL);
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mvprintw(y, x, " %-25s", NAMES[i][1]);
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}
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}
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// Redraw the parts of the ASCII table necessary for the selected item
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static void redraw(int selected)
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{
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static int last_selected = -1;
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if (selected == last_selected) return;
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if (last_selected == -1) {
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for (int i = 0; i < 128; i++) {
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if (i == selected) attr_on(A_REVERSE, NULL);
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else attr_off(A_REVERSE, NULL);
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draw_char(i);
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}
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} else {
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attr_on(A_REVERSE, NULL);
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draw_char(selected);
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attr_off(A_REVERSE, NULL);
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draw_char(last_selected);
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}
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refresh();
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last_selected = selected;
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}
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int main(int argc, char *argv[])
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{
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if (argc >= 2) {
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for (int i = 1; i < argc; i++) {
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putc(atoi(argv[i]), stdout);
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}
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return 0;
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}
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size_t buf_size = 256, buf_i = 0;
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char *outbuf = calloc(buf_size, sizeof(char));
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SCREEN *screen = newterm(NULL, stderr, stdin);
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set_term(screen);
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set_escdelay(5);
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W = getmaxx(stdscr);
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H = getmaxy(stdscr);
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noecho();
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keypad(stdscr, 1);
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curs_set(0);
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start_color();
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init_pair(DECIMAL_COLOR, COLOR_YELLOW, COLOR_BLACK);
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init_pair(HEX_COLOR, COLOR_GREEN, COLOR_BLACK);
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init_pair(CHAR_COLOR, COLOR_MAGENTA, COLOR_BLACK);
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init_pair(DESCRIPTION_COLOR, COLOR_WHITE, COLOR_BLACK);
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init_pair(OUTPUT_CHAR_COLOR, COLOR_BLACK, COLOR_WHITE);
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init_pair(OUTPUT_ESCAPE_COLOR, COLOR_RED, COLOR_WHITE);
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// Bar at the bottom of the screen showing the output text
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attr_on(A_BOLD, NULL);
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attr_on(A_REVERSE, NULL);
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mvprintw(H-1, 0, " Output:");
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int output_x = 9;
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int selected = 0;
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while (1) {
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redraw(selected);
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int key = getch();
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switch (key) {
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case 'j': case KEY_DOWN:
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selected++;
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break;
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case 'J':
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selected += 10;
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break;
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case 'k': case KEY_UP:
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selected--;
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break;
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case 'K':
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selected -= 10;
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break;
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case 'l': case 'L': case KEY_RIGHT: case KEY_SRIGHT:
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if (selected + H-1 < 128)
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selected += H-1;
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break;
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case 'h': case 'H': case KEY_LEFT: case KEY_SLEFT:
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if (selected - H-1 >= 0)
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selected -= H-1;
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break;
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case KEY_RESIZE:
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W = getmaxx(stdscr);
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H = getmaxy(stdscr);
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clear();
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break;
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case KEY_ENTER: case '\n':
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outbuf[buf_i++] = (char)selected;
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if (buf_i >= buf_size) {
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buf_size *= 2;
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outbuf = realloc(outbuf, buf_size);
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}
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if (' ' <= selected && selected <= '~') { // printable range
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color_set(OUTPUT_CHAR_COLOR, NULL);
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mvprintw(H-1, output_x++, "%c", selected);
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} else {
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color_set(OUTPUT_ESCAPE_COLOR, NULL);
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mvprintw(H-1, output_x, "\\x%02X", selected);
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output_x += 4;
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}
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break;
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case 'q': case 'Q': case KEY_CANCEL: case KEY_CLOSE: case KEY_EXIT: case 27:
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endwin();
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write(1, outbuf, buf_i);
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return 0;
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}
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if (selected < 0) selected = 0;
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if (selected >= 128) selected = 127;
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}
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endwin();
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return 0;
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}
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