so://phie

blob: 51f7ca28b9b962cdc46e2e2a553b336710350baa (5080 bytes)[doc][blame][raw]

  1#ifndef LIB_TERM_H
  2#define LIB_TERM_H
  3
  4typedef enum {
  5  KEY_ENTER = 13,
  6  KEY_ESC = 27,
  7  KEY_BACKSPACE = 127,
  8  KEY_ARROW_LEFT = 1000,
  9  KEY_ARROW_RIGHT,
 10  KEY_ARROW_UP,
 11  KEY_ARROW_DOWN,
 12  KEY_DEL,
 13  KEY_HOME,
 14  KEY_END,
 15  KEY_PAGE_UP,
 16  KEY_PAGE_DOWN,
 17} keycode_t;
 18
 19typedef struct {
 20  char *buffer;
 21  int len;
 22} term_t;
 23
 24void term_panic(const char *s);
 25void term_disable_raw_mode(void);
 26void term_enable_raw_mode(void);
 27int term_read_cursor_pos(int *rows, int *cols);
 28int term_read_window_size(int *rows, int *cols);
 29int term_poll_key(int timeout);
 30int term_read_key(void);
 31void term_write(char *str);
 32void term_writef(const char *format, ...);
 33void term_flush(void);
 34
 35#ifdef LIB_TERM_IMPL
 36
 37#include <stdio.h>
 38#include <stdlib.h>
 39#include <string.h>
 40#include <unistd.h>
 41#include <termios.h>
 42#include <sys/ioctl.h>
 43#include <errno.h>
 44#include <stdarg.h>
 45#include <poll.h>
 46
 47struct termios termios;
 48term_t term = { NULL, 0 };
 49
 50void term_panic(const char *str) {
 51  write(STDOUT_FILENO, "\x1b[2J", 4);
 52  write(STDOUT_FILENO, "\x1b[H", 3);
 53  write(STDOUT_FILENO, "\x1b[?25h", 6);
 54  perror(str);
 55  exit(EXIT_FAILURE);
 56}
 57
 58void term_disable_raw_mode(void) {
 59  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &termios) == -1) {
 60    term_panic("tcsetattr");
 61  }
 62}
 63
 64void term_enable_raw_mode(void) {
 65  if (tcgetattr(STDIN_FILENO, &termios) == -1) {
 66    term_panic("tcgetattr");
 67  }
 68  atexit(term_disable_raw_mode);
 69  struct termios raw = termios;
 70  raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
 71  raw.c_oflag &= ~(OPOST);
 72  raw.c_cflag |= (CS8);
 73  raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
 74  raw.c_cc[VMIN] = 0;
 75  raw.c_cc[VTIME] = 1;
 76  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
 77    term_panic("tcsetattr");
 78  }
 79}
 80
 81int term_read_cursor_pos(int *rows, int *cols) {
 82  char buf[32];
 83  unsigned int i = 0;
 84  if (write(STDOUT_FILENO, "\x1b[6n", 4) != 4) {
 85    return -1;
 86  }
 87  while (i < sizeof(buf) - 1) {
 88    if (read(STDIN_FILENO, &buf[i], 1) != 1) {
 89      break;
 90    }
 91    if (buf[i] == 'R') {
 92      break;
 93    }
 94    i++;
 95  }
 96  buf[i] = '\0';
 97  if (buf[0] != '\x1b' || buf[1] != '[') {
 98    return -1;
 99  }
100  if (sscanf(&buf[2], "%d;%d", rows, cols) != 2) {
101    return -1;
102  }
103  return -0;
104}
105
106int term_read_window_size(int *rows, int *cols) {
107  struct winsize ws;
108  if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
109    if (write(STDOUT_FILENO, "\x1b[999C\x1b[999B", 12) != 12) {
110      return -1;
111    }
112    return term_read_cursor_pos(rows, cols);
113  }
114  else {
115    *cols = ws.ws_col;
116    *rows = ws.ws_row;
117    return 0;
118  }
119}
120
121int term_poll_key(int timeout) {
122  struct pollfd fds[1];
123  fds[0].fd = STDIN_FILENO;
124  fds[0].events = POLLIN | POLLPRI;
125  if (poll(fds, 1, timeout)) {
126    return term_read_key();
127  }
128  return 0;
129}
130
131int term_read_key(void) {
132  int len;
133  char c;
134  while ((len = read(STDIN_FILENO, &c, 1)) != 1) {
135    if (len == -1 && errno != EAGAIN) {
136      term_panic("read");
137    }
138  }
139  if (c == '\x1b') {
140    char seq[3];
141    if (read(STDIN_FILENO, &seq[0], 1) != 1) {
142      return '\x1b';
143    }
144    if (read(STDIN_FILENO, &seq[1], 1) != 1) {
145      return '\x1b';
146    }
147    if (seq[0] == '[') {
148      if (seq[1] >= '0' && seq[1] <= '9') {
149        if (read(STDIN_FILENO, &seq[2], 1) != 1) {
150          return '\x1b';
151        }
152        if (seq[2] == '~') {
153          switch (seq[1]) {
154            case '1':
155              return KEY_HOME;
156            case '3':
157              return KEY_DEL;
158            case '4':
159              return KEY_END;
160            case '5':
161              return KEY_PAGE_UP;
162            case '6':
163              return KEY_PAGE_DOWN;
164            case '7':
165              return KEY_HOME;
166            case '8':
167              return KEY_END;
168          }
169        }
170      }
171      else {
172        switch (seq[1]) {
173          case 'A':
174            return KEY_ARROW_UP;
175          case 'B':
176            return KEY_ARROW_DOWN;
177          case 'C':
178            return KEY_ARROW_RIGHT;
179          case 'D':
180            return KEY_ARROW_LEFT;
181          case 'H':
182            return KEY_HOME;
183          case 'F':
184            return KEY_END;
185        }
186        return '\x1b';
187      }
188    }
189    else if (seq[0] == 'O') {
190      switch (seq[1]) {
191        case 'H':
192          return KEY_HOME;
193        case 'F':
194          return KEY_END;
195      }
196    }
197  }
198  return c;
199}
200
201void term_write(char *str) {
202  int str_len = strlen(str);
203  char *new_buffer = realloc(term.buffer, sizeof(char) * (term.len + str_len + 1));
204  if (new_buffer == NULL) {
205    fprintf(stderr, "Cannot realloc memory!\n");
206    return;
207  }
208  term.buffer = new_buffer;
209  memcpy(term.buffer + term.len, str, str_len);
210  term.len += str_len;
211  term.buffer[term.len] = '\0';
212}
213
214void term_writef(const char *format, ...) {
215  va_list args;
216  va_start(args, format);
217  char str[1000];
218  vsnprintf(str, sizeof(str), format, args);
219  term_write(str);
220  va_end(args);
221}
222
223void term_flush(void) {
224  if (term.len > 0) {
225    write(STDOUT_FILENO, term.buffer, term.len);
226    free(term.buffer);
227    term.buffer = NULL;
228    term.len = 0;
229  }
230}
231
232#endif // LIB_TERM_IMPL
233#endif // LIB_TERM_H