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blob: c2455bc0725eddbdd872fc0aaaff20aa08f97a2a (8113 bytes)[doc][blame][raw]

  1#ifndef _LIB_TERM_H
  2#define _LIB_TERM_H
  3
  4#include <stddef.h>
  5#include <stdbool.h>
  6#include <termios.h>
  7
  8typedef enum {
  9  TERM_CODE_RAWMODE_ENABLE,
 10  TERM_CODE_RAWMODE_DISABLE,
 11  TERM_CODE_CURSOR_READ,
 12  TERM_CODE_WINDOW_READ,
 13  TERM_CODE_KEY_POLL,
 14  TERM_CODE_KEY_READ,
 15  TERM_CODE_WRITE,
 16  TERM_CODE_FLUSH,
 17} term_code_t;
 18
 19typedef enum {
 20  KEY_ENTER = 13,
 21  KEY_ESC = 27,
 22  KEY_BACKSPACE = 127,
 23  KEY_ARROW_LEFT = 1000,
 24  KEY_ARROW_RIGHT,
 25  KEY_ARROW_UP,
 26  KEY_ARROW_DOWN,
 27  KEY_DEL,
 28  KEY_HOME,
 29  KEY_END,
 30  KEY_PAGE_UP,
 31  KEY_PAGE_DOWN,
 32} term_keycode_t;
 33
 34typedef void (*term_dispatch_fn_t)(int fd, term_code_t code, void *data, size_t len);
 35typedef void *(*term_fetch_fn_t)(int fd, term_code_t code, void *data, size_t len, size_t ret_len);
 36
 37typedef struct {
 38  struct termios termios;
 39  char *buffer;
 40  size_t len;
 41  bool teleterm_mode;
 42  term_dispatch_fn_t dispatch;
 43  term_fetch_fn_t fetch;
 44  int fd;
 45} term_t;
 46
 47term_t term_init(void);
 48void term_cleanup(term_t *self);
 49void term_fd_set(term_t *self, int fd);
 50void term_teleterm_enable(term_t *self, term_dispatch_fn_t dispatch, term_fetch_fn_t fetch);
 51void term_rawmode_enable(term_t *self);
 52void term_rawmode_disable(term_t *self);
 53void term_write(term_t *self,  char *str);
 54void term_writef(term_t *self, const char *format, ...);
 55void term_flush(term_t *self);
 56int term_read_cursor(term_t *self, size_t *rows, size_t *cols);
 57int term_read_window(term_t *self, size_t *rows, size_t *cols);
 58int term_read_key(term_t *self);
 59int term_poll_key(term_t *self, int timeout_ms);
 60
 61#ifdef LIB_TERM_IMPL
 62
 63#include <stdio.h>
 64#include <stdlib.h>
 65#include <string.h>
 66#include <unistd.h>
 67#include <sys/ioctl.h>
 68#include <errno.h>
 69#include <stdarg.h>
 70#include <poll.h>
 71
 72void _term_panic(term_t *self, const char *str) {
 73  write(self->fd, "\x1b[2J", 4);
 74  write(self->fd, "\x1b[H", 3);
 75  write(self->fd, "\x1b[?25h", 6);
 76  perror(str);
 77  exit(EXIT_FAILURE);
 78}
 79
 80term_t term_init(void) {
 81  return (term_t) {
 82    .buffer = NULL,
 83    .len = 0,
 84    .teleterm_mode = false,
 85    .dispatch = NULL,
 86    .fetch = NULL,
 87    .fd = STDOUT_FILENO,
 88  };
 89}
 90
 91void term_cleanup(term_t *self) {
 92  if (self) {
 93    if (self->buffer) {
 94      free(self->buffer);
 95      self->buffer = NULL;
 96      self->len = 0;
 97    }
 98  }
 99}
100
101void term_fd_set(term_t *self, int fd) {
102  self->fd = fd;
103}
104
105void term_teleterm_enable(term_t *self, term_dispatch_fn_t dispatch, term_fetch_fn_t fetch) {
106  self->teleterm_mode = true;
107  self->dispatch = dispatch;
108  self->fetch = fetch;
109}
110
111void term_rawmode_enable(term_t *self) {
112  if (self->teleterm_mode) {
113    self->dispatch(self->fd, TERM_CODE_RAWMODE_ENABLE, NULL, 0);
114    return;
115  }
116  if (tcgetattr(STDIN_FILENO, &self->termios) == -1) {
117    _term_panic(self, "tcgetattr");
118  }
119  struct termios raw = self->termios;
120  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
121  raw.c_oflag &= ~(OPOST);
122  raw.c_cflag |= (CS8);
123  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
124  raw.c_cc[VMIN] = 0;
125  raw.c_cc[VTIME] = 1;
126  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
127    _term_panic(self, "tcsetattr");
128  }
129}
130
131void term_rawmode_disable(term_t *self) {
132  if (self->teleterm_mode) {
133    self->dispatch(self->fd, TERM_CODE_RAWMODE_DISABLE, NULL, 0);
134    return;
135  }
136  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &self->termios) == -1) {
137    _term_panic(self, "tcsetattr");
138  }
139}
140
141void term_write(term_t *self,  char *str) {
142  if (self->teleterm_mode) {
143    self->dispatch(self->fd, TERM_CODE_WRITE, NULL, 0);
144  }
145  size_t str_len = strlen(str);
146  char *new_buffer = (char *) realloc(self->buffer, sizeof(char) * (self->len + str_len + 1));
147  if (new_buffer == NULL) {
148    fprintf(stderr, "Cannot realloc memory!\n");
149    return;
150  }
151  self->buffer = new_buffer;
152  memcpy(self->buffer + self->len, str, str_len);
153  self->len += str_len;
154  self->buffer[self->len] = '\0';
155}
156
157void term_writef(term_t *self, const char *format, ...) {
158  va_list args;
159  va_start(args, format);
160  char str[1000];
161  vsnprintf(str, sizeof(str), format, args);
162  term_write(self, str);
163  va_end(args);
164}
165
166void term_flush(term_t *self) {
167  if (self->len > 0) {
168    if (self->teleterm_mode) {
169      self->dispatch(self->fd, TERM_CODE_FLUSH, self->buffer, self->len);
170    }
171    else {
172      write(self->fd, self->buffer, self->len);
173    }
174    free(self->buffer);
175    self->buffer = NULL;
176    self->len = 0;
177  }
178}
179
180int term_read_cursor(term_t *self, size_t *rows, size_t *cols) {
181  if (self->teleterm_mode) {
182    void *data = self->fetch(self->fd, TERM_CODE_CURSOR_READ, NULL, 0, 2 * sizeof(size_t));
183    if (data) {
184      size_t *tuple = (size_t *) data;
185      *rows = tuple[0];
186      *cols = tuple[1];
187      free(data);
188      return 0;
189    }
190    return -1;
191  }
192  char buf[32];
193  unsigned int i = 0;
194  if (write(self->fd, "\x1b[6n", 4) != 4) {
195    return -1;
196  }
197  while (i < sizeof(buf) - 1) {
198    if (read(STDIN_FILENO, &buf[i], 1) != 1) {
199      break;
200    }
201    if (buf[i] == 'R') {
202      break;
203    }
204    i++;
205  }
206  buf[i] = '\0';
207  if (buf[0] != '\x1b' || buf[1] != '[') {
208    return -1;
209  }
210  if (sscanf(&buf[2], "%zu;%zu", rows, cols) != 2) {
211    return -1;
212  }
213  return 0;
214}
215
216int term_read_window(term_t *self, size_t *rows, size_t *cols) {
217  if (self->teleterm_mode) {
218    void *data = self->fetch(self->fd, TERM_CODE_WINDOW_READ, NULL, 0, 2 * sizeof(size_t));
219    if (data) {
220      size_t *tuple = (size_t *) data;
221      *rows = tuple[0];
222      *cols = tuple[1];
223      free(data);
224      return 0;
225    }
226    return -1;
227  }
228  struct winsize ws;
229  if (ioctl(self->fd, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
230    if (write(self->fd, "\x1b[999C\x1b[999B", 12) != 12) {
231      return -1;
232    }
233    return term_read_cursor(self, rows, cols);
234  }
235  else {
236    *cols = ws.ws_col;
237    *rows = ws.ws_row;
238    return 0;
239  }
240}
241
242int term_read_key(term_t *self) {
243  if (self->teleterm_mode) {
244    void *data = self->fetch(self->fd, TERM_CODE_KEY_READ, NULL, 0, sizeof(int));
245    if (data) {
246      int *single = (int *) data;
247      int key = *single;
248      free(data);
249      return key;
250    }
251    return -1;
252  }
253  int len;
254  char c;
255  while ((len = read(STDIN_FILENO, &c, 1)) != 1) {
256    if (len == -1 && errno != EAGAIN) {
257      _term_panic(self, "read");
258    }
259  }
260  if (c == '\x1b') {
261    char seq[3];
262    if (read(STDIN_FILENO, &seq[0], 1) != 1) {
263      return '\x1b';
264    }
265    if (read(STDIN_FILENO, &seq[1], 1) != 1) {
266      return '\x1b';
267    }
268    if (seq[0] == '[') {
269      if (seq[1] >= '0' && seq[1] <= '9') {
270        if (read(STDIN_FILENO, &seq[2], 1) != 1) {
271          return '\x1b';
272        }
273        if (seq[2] == '~') {
274          switch (seq[1]) {
275            case '1':
276              return KEY_HOME;
277            case '3':
278              return KEY_DEL;
279            case '4':
280              return KEY_END;
281            case '5':
282              return KEY_PAGE_UP;
283            case '6':
284              return KEY_PAGE_DOWN;
285            case '7':
286              return KEY_HOME;
287            case '8':
288              return KEY_END;
289          }
290        }
291      }
292      else {
293        switch (seq[1]) {
294          case 'A':
295            return KEY_ARROW_UP;
296          case 'B':
297            return KEY_ARROW_DOWN;
298          case 'C':
299            return KEY_ARROW_RIGHT;
300          case 'D':
301            return KEY_ARROW_LEFT;
302          case 'H':
303            return KEY_HOME;
304          case 'F':
305            return KEY_END;
306        }
307        return '\x1b';
308      }
309    }
310    else if (seq[0] == 'O') {
311      switch (seq[1]) {
312        case 'H':
313          return KEY_HOME;
314        case 'F':
315          return KEY_END;
316      }
317    }
318  }
319  return c;
320}
321
322int term_poll_key(term_t *self, int timeout_ms) {
323  if (self->teleterm_mode) {
324    void *data = self->fetch(self->fd, TERM_CODE_KEY_POLL, &timeout_ms, sizeof(timeout_ms), sizeof(int));
325    if (data) {
326      int *single = (int *) data;
327      int key = *single;
328      free(data);
329      return key;
330    }
331    return -1;
332  }
333  struct pollfd fds[1];
334  fds[0].fd = STDIN_FILENO;
335  fds[0].events = POLLIN | POLLPRI;
336  if (poll(fds, 1, timeout_ms)) {
337    return term_read_key(self);
338  }
339  return 0;
340}
341
342#endif // LIB_TERM_IMPL
343#endif // _LIB_TERM_H