so://phie

so-term

An easy-to-use terminal library
git clone git://soophie.de/so-term

• log
• tree
• refs
• README

branch:main

• README.md [new file]

  1# libterm
  2
  3An easy-to-use terminal library
  

• term.c [new file]

  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 "term.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}
  

• term.h [new file]

  1#pragma once
  2
  3typedef enum {
  4  ESC = 27,
  5  BACKSPACE = 127,
  6  ARROW_LEFT = 1000,
  7  ARROW_RIGHT,
  8  ARROW_UP,
  9  ARROW_DOWN,
  10  DEL_KEY,
  11  HOME_KEY,
  12  END_KEY,
  13  PAGE_UP,
  14  PAGE_DOWN,
  15} keycode_t;
  16
  17typedef struct {
  18  char *buffer;
  19  int len;
  20} term_t;
  21
  22void term_panic(const char *s);
  23void term_disable_raw_mode(void);
  24void term_enable_raw_mode(void);
  25int term_read_cursor_pos(int *rows, int *cols);
  26int term_read_window_size(int *rows, int *cols);
  27int term_poll_key(int timeout);
  28int term_read_key(void);
  29void term_write(char *str);
  30void term_writef(const char *format, ...);
  31void term_flush(void);