so://phie

blob: ff2a0a441674bada5d6eccb8a259e762579777fe (4330 bytes)[doc][blame][raw]

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