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libterm.c - libterm - An easy-to-use terminal library
	libterm An easy-to-use terminal library
	git clone git@soophie.de:/srv/git/libterm
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libterm.c (4330B)
      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 
     13 struct termios termios;
     14 term_t term = { NULL, 0 };
     15 
     16 void 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 
     24 void term_disable_raw_mode() {
     25   if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &termios) == -1) {
     26     term_panic("tcsetattr");
     27   }
     28 }
     29 
     30 void 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 
     47 int 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 
     72 int 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 
     87 int 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 
     97 int 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 
    167 void 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 
    180 void 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 
    189 void 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 }