271 lines
11 KiB
C
271 lines
11 KiB
C
//
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// terminal.c
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// Copyright 2020 Bruce Hill
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// Released under the MIT License
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//
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// Implementations of some basic terminal stuff, like reading keys and some
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// terminal escape sequences.
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//
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "terminal.h"
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typedef struct {
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int key;
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const char *name;
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} keyname_t;
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static keyname_t key_names[] = {
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{KEY_SPACE, "Space"}, {KEY_BACKSPACE2, "Backspace"},
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{KEY_F1, "F1"}, {KEY_F2, "F2"}, {KEY_F3, "F3"}, {KEY_F4, "F4"}, {KEY_F5, "F5"},
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{KEY_F6, "F6"}, {KEY_F7, "F7"}, {KEY_F8, "F8"}, {KEY_F9, "F9"}, {KEY_F10, "F10"},
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{KEY_F11, "F11"}, {KEY_F12, "F12"},
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{KEY_INSERT, "Insert"}, {KEY_DELETE, "Delete"},
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{KEY_HOME, "Home"}, {KEY_END, "End"},
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{KEY_PGUP, "PgUp"}, {KEY_PGUP, "Page Up"},
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{KEY_PGDN, "PgDn"}, {KEY_PGDN, "Page Down"},
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{KEY_ARROW_UP, "Up"}, {KEY_ARROW_DOWN, "Down"}, {KEY_ARROW_LEFT, "Left"}, {KEY_ARROW_RIGHT, "Right"},
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{MOUSE_LEFT_PRESS, "Left press"}, {MOUSE_RIGHT_PRESS, "Right press"}, {MOUSE_MIDDLE_PRESS, "Middle press"},
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{MOUSE_LEFT_DRAG, "Left drag"}, {MOUSE_RIGHT_DRAG, "Right drag"}, {MOUSE_MIDDLE_DRAG, "Middle drag"},
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{MOUSE_LEFT_RELEASE, "Left click"}, {MOUSE_RIGHT_RELEASE, "Right click"}, {MOUSE_MIDDLE_RELEASE, "Middle click"},
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{MOUSE_LEFT_RELEASE, "Left up"}, {MOUSE_RIGHT_RELEASE, "Right up"}, {MOUSE_MIDDLE_RELEASE, "Middle up"},
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{MOUSE_LEFT_RELEASE, "Left release"}, {MOUSE_RIGHT_RELEASE, "Right release"}, {MOUSE_MIDDLE_RELEASE, "Middle release"},
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{MOUSE_LEFT_DOUBLE, "Double left click"}, {MOUSE_RIGHT_DOUBLE, "Double right click"}, {MOUSE_MIDDLE_DOUBLE, "Double middle click"},
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{MOUSE_WHEEL_RELEASE, "Mouse wheel up"}, {MOUSE_WHEEL_PRESS, "Mouse wheel down"},
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{KEY_TAB, "Tab"}, {KEY_ENTER, "Enter"}, {KEY_ENTER, "Return"},
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{KEY_CTRL_A, "Ctrl-a"}, {KEY_CTRL_B, "Ctrl-b"}, {KEY_CTRL_C, "Ctrl-c"},
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{KEY_CTRL_D, "Ctrl-d"}, {KEY_CTRL_E, "Ctrl-e"}, {KEY_CTRL_F, "Ctrl-f"},
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{KEY_CTRL_G, "Ctrl-g"}, {KEY_CTRL_H, "Ctrl-h"}, {KEY_CTRL_I, "Ctrl-i"},
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{KEY_CTRL_J, "Ctrl-j"}, {KEY_CTRL_K, "Ctrl-k"}, {KEY_CTRL_L, "Ctrl-l"},
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{KEY_CTRL_M, "Ctrl-m"}, {KEY_CTRL_N, "Ctrl-n"}, {KEY_CTRL_O, "Ctrl-o"},
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{KEY_CTRL_P, "Ctrl-p"}, {KEY_CTRL_Q, "Ctrl-q"}, {KEY_CTRL_R, "Ctrl-r"},
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{KEY_CTRL_S, "Ctrl-s"}, {KEY_CTRL_T, "Ctrl-t"}, {KEY_CTRL_U, "Ctrl-u"},
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{KEY_CTRL_V, "Ctrl-v"}, {KEY_CTRL_W, "Ctrl-w"}, {KEY_CTRL_X, "Ctrl-x"},
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{KEY_CTRL_Y, "Ctrl-y"}, {KEY_CTRL_Z, "Ctrl-z"},
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{KEY_ESC, "Esc"}, {KEY_ESC, "Escape"},
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{KEY_CTRL_TILDE, "Ctrl-~"}, {KEY_CTRL_BACKSLASH, "Ctrl-\\"},
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{KEY_CTRL_LSQ_BRACKET, "Ctrl-]"}, {KEY_CTRL_RSQ_BRACKET, "Ctrl-]"},
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{KEY_CTRL_UNDERSCORE, "Ctrl-_"}, {KEY_CTRL_SLASH, "Ctrl-/"},
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{KEY_CTRL_AT, "Ctrl-@"}, {KEY_CTRL_CARET, "Ctrl-^"},
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{KEY_CTRL_BACKTICK, "Ctrl-`"},
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{KEY_CTRL_2, "Ctrl-2"}, {KEY_CTRL_3, "Ctrl-3"}, {KEY_CTRL_4, "Ctrl-4"},
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{KEY_CTRL_5, "Ctrl-5"}, {KEY_CTRL_6, "Ctrl-6"}, {KEY_CTRL_7, "Ctrl-7"},
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{KEY_CTRL_5, "Ctrl-8"}, {KEY_CTRL_6, "Ctrl-9"},
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{':', "Colon"}, {',', "Comma"},
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};
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static int nextchar(int fd)
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{
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char c;
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return read(fd, &c, 1) == 1 ? c : -1;
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}
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static int nextnum(int fd, int c, int *n)
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{
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for (*n = 0; '0' <= c && c <= '9'; c = nextchar(fd))
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*n = 10*(*n) + (c - '0');
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return c;
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}
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//
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// Get one key of input from the given file. Returns -1 on failure.
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// If mouse_x or mouse_y are non-null and a mouse event occurs, they will be
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// set to the position of the mouse (0-indexed).
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//
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int bgetkey(FILE *in, int *mouse_x, int *mouse_y)
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{
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if (mouse_x) *mouse_x = -1;
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if (mouse_y) *mouse_y = -1;
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int fd = fileno(in);
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int numcode = 0, modifiers = 0;
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int c = nextchar(fd);
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if (c == '\x1b')
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goto escape;
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return c;
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escape:
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c = nextchar(fd);
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// Actual escape key:
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if (c < 0)
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return KEY_ESC;
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switch (c) {
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case '\x1b': return KEY_ESC;
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case '[': c = nextchar(fd); goto CSI_start;
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case 'P': goto DCS;
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case 'O': goto SS3;
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default: return MOD_ALT | c;
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}
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CSI_start:
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if (c == -1)
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return MOD_ALT | '[';
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switch (c) {
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case 'A': return modifiers | KEY_ARROW_UP;
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case 'B': return modifiers | KEY_ARROW_DOWN;
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case 'C': return modifiers | KEY_ARROW_RIGHT;
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case 'D': return modifiers | KEY_ARROW_LEFT;
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case 'F': return modifiers | KEY_END;
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case 'H': return modifiers | KEY_HOME;
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case 'J': return numcode == 2 ? (MOD_SHIFT | KEY_HOME) : -1;
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case 'K': return MOD_SHIFT | KEY_END;
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case 'M': return MOD_CTRL | KEY_DELETE;
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case 'P': return modifiers | (numcode == 1 ? KEY_F1 : KEY_DELETE);
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case 'Q': return numcode == 1 ? (modifiers | KEY_F2) : -1;
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case 'R': return numcode == 1 ? (modifiers | KEY_F3) : -1;
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case 'S': return numcode == 1 ? (modifiers | KEY_F4) : -1;
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case '~':
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switch (numcode) {
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case 1: return modifiers | KEY_HOME;
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case 2: return modifiers | KEY_INSERT;
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case 3: return modifiers | KEY_DELETE;
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case 4: return modifiers | KEY_END;
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case 5: return modifiers | KEY_PGUP;
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case 6: return modifiers | KEY_PGDN;
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case 7: return modifiers | KEY_HOME;
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case 8: return modifiers | KEY_END;
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case 10: return modifiers | KEY_F0;
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case 11: return modifiers | KEY_F1;
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case 12: return modifiers | KEY_F2;
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case 13: return modifiers | KEY_F3;
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case 14: return modifiers | KEY_F4;
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case 15: return modifiers | KEY_F5;
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case 17: return modifiers | KEY_F6;
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case 18: return modifiers | KEY_F7;
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case 19: return modifiers | KEY_F8;
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case 20: return modifiers | KEY_F9;
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case 21: return modifiers | KEY_F10;
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case 23: return modifiers | KEY_F11;
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case 24: return modifiers | KEY_F12;
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default: break;
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}
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return -1;
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case '<': { // Mouse clicks
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int buttons = 0, x = 0, y = 0;
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c = nextnum(fd, nextchar(fd), &buttons);
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if (c != ';') return -1;
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c = nextnum(fd, nextchar(fd), &x);
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if (c != ';') return -1;
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c = nextnum(fd, nextchar(fd), &y);
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if (c != 'm' && c != 'M') return -1;
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if (mouse_x) *mouse_x = x - 1;
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if (mouse_y) *mouse_y = y - 1;
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if (buttons & 4) modifiers |= MOD_SHIFT;
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if (buttons & 8) modifiers |= MOD_META;
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if (buttons & 16) modifiers |= MOD_CTRL;
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int key = -1;
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switch (buttons & ~(4|8|16)) {
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case 0: key = c == 'm' ? MOUSE_LEFT_RELEASE : MOUSE_LEFT_PRESS; break;
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case 1: key = c == 'm' ? MOUSE_MIDDLE_RELEASE : MOUSE_MIDDLE_PRESS; break;
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case 2: key = c == 'm' ? MOUSE_RIGHT_RELEASE : MOUSE_RIGHT_PRESS; break;
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case 32: key = MOUSE_LEFT_DRAG; break;
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case 33: key = MOUSE_MIDDLE_DRAG; break;
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case 34: key = MOUSE_RIGHT_DRAG; break;
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case 64: key = MOUSE_WHEEL_RELEASE; break;
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case 65: key = MOUSE_WHEEL_PRESS; break;
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default: return -1;
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}
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if (key == MOUSE_LEFT_RELEASE || key == MOUSE_RIGHT_RELEASE || key == MOUSE_MIDDLE_RELEASE) {
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static int lastclick = -1;
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static struct timespec lastclicktime = {0, 0};
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struct timespec clicktime;
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clock_gettime(CLOCK_MONOTONIC, &clicktime);
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if (key == lastclick) {
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double dt_ms = 1e3*(double)(clicktime.tv_sec - lastclicktime.tv_sec)
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+ 1e-6*(double)(clicktime.tv_nsec - lastclicktime.tv_nsec);
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if (dt_ms < DOUBLECLICK_THRESHOLD) {
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switch (key) {
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case MOUSE_LEFT_RELEASE: key = MOUSE_LEFT_DOUBLE; break;
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case MOUSE_RIGHT_RELEASE: key = MOUSE_RIGHT_DOUBLE; break;
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case MOUSE_MIDDLE_RELEASE: key = MOUSE_MIDDLE_DOUBLE; break;
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default: break;
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}
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}
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}
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lastclicktime = clicktime;
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lastclick = key;
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}
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return modifiers | key;
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}
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default:
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if ('0' <= c && c <= '9') {
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// Ps prefix
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c = nextnum(fd, c, &numcode);
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if (c == ';') {
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c = nextnum(fd, nextchar(fd), &modifiers);
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modifiers = (modifiers >> 1) << MOD_BITSHIFT;
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}
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goto CSI_start;
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}
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}
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return -1;
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DCS:
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return -1;
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SS3:
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switch (nextchar(fd)) {
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case 'P': return KEY_F1;
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case 'Q': return KEY_F2;
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case 'R': return KEY_F3;
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case 'S': return KEY_F4;
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default: break;
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}
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return -1;
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}
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//
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// Populate `buf` with the name of a key.
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//
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char *bkeyname(int key, char *buf)
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{
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if (key & MOD_META) buf = stpcpy(buf, "Super-");
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if (key & MOD_CTRL) buf = stpcpy(buf, "Ctrl-");
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if (key & MOD_ALT) buf = stpcpy(buf, "Alt-");
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if (key & MOD_SHIFT) buf = stpcpy(buf, "Shift-");
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key &= ~(MOD_META | MOD_CTRL | MOD_ALT | MOD_SHIFT);
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for (size_t i = 0; i < sizeof(key_names)/sizeof(key_names[0]); i++) {
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if (key_names[i].key == key) {
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return stpcpy(buf, key_names[i].name);
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}
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}
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if (' ' < key && key <= '~')
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return buf + sprintf(buf, "%c", key);
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else
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return buf + sprintf(buf, "\\x%02X", (unsigned int)key);
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}
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//
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// Return the key with the given name, if one exists, otherwise -1.
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// (i.e. bkeywithname("Space") == ' ', bkeywithname("x") == 'x', bkeywithname("F1") == KEY_F1, bkeywithname("???") == -1)
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//
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int bkeywithname(const char *name)
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{
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int modifiers = 0;
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static const struct { const char *prefix; int modifier; } modnames[] = {
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{"Super-", MOD_META}, {"Ctrl-", MOD_CTRL}, {"Alt-", MOD_ALT}, {"Shift-", MOD_SHIFT}
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};
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check_names:
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for (size_t i = 0; i < sizeof(key_names)/sizeof(key_names[0]); i++) {
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if (strcmp(key_names[i].name, name) == 0)
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return modifiers | key_names[i].key;
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}
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for (size_t i = 0; i < sizeof(modnames)/sizeof(modnames[0]); i++) {
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if (strncmp(name, modnames[i].prefix, strlen(modnames[i].prefix)) == 0) {
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modifiers |= modnames[i].modifier;
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name += strlen(modnames[i].prefix);
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goto check_names;
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}
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}
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return strlen(name) == 1 ? name[0] : -1;
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}
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// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1
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