so://phie

so-term

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

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• Makefile [new file] [old file]

  1default: build
  2
  3build:
  4	cc -o libterm.so -shared -fPIC -Wall -Wextra libterm.c
  5
  1install:
  7	cc -o libterm.so -shared -fPIC libterm.c
  8	sudo cp libterm.h /usr/local/include/
  9	sudo cp libterm.so /usr/local/lib/
  10	sudo ldconfig
  11	rm libterm.so
  2	sudo cp src/libterm.h /usr/local/include/
  3
  4uninstall:
  5	sudo rm /usr/local/include/libterm.h
  15	sudo rm /usr/local/lib/libterm.so
  16
  17clean:
  18	rm libterm.so
  

• libterm.c [old 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 "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 KEY_HOME;
  122            case '3':
  123              return KEY_DEL;
  124            case '4':
  125              return KEY_END;
  126            case '5':
  127              return KEY_PAGE_UP;
  128            case '6':
  129              return KEY_PAGE_DOWN;
  130            case '7':
  131              return KEY_HOME;
  132            case '8':
  133              return KEY_END;
  134          }
  135        }
  136      }
  137      else {
  138        switch (seq[1]) {
  139          case 'A':
  140            return KEY_ARROW_UP;
  141          case 'B':
  142            return KEY_ARROW_DOWN;
  143          case 'C':
  144            return KEY_ARROW_RIGHT;
  145          case 'D':
  146            return KEY_ARROW_LEFT;
  147          case 'H':
  148            return KEY_HOME;
  149          case 'F':
  150            return KEY_END;
  151        }
  152        return '\x1b';
  153      }
  154    }
  155    else if (seq[0] == 'O') {
  156      switch (seq[1]) {
  157        case 'H':
  158          return KEY_HOME;
  159        case 'F':
  160          return KEY_END;
  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}
  

• libterm.h [old file]

  1#pragma once
  2
  3typedef enum {
  4  KEY_ENTER = 13,
  5  KEY_ESC = 27,
  6  KEY_BACKSPACE = 127,
  7  KEY_ARROW_LEFT = 1000,
  8  KEY_ARROW_RIGHT,
  9  KEY_ARROW_UP,
  10  KEY_ARROW_DOWN,
  11  KEY_DEL,
  12  KEY_HOME,
  13  KEY_END,
  14  KEY_PAGE_UP,
  15  KEY_PAGE_DOWN,
  16} keycode_t;
  17
  18typedef struct {
  19  char *buffer;
  20  int len;
  21} term_t;
  22
  23void term_panic(const char *s);
  24void term_disable_raw_mode(void);
  25void term_enable_raw_mode(void);
  26int term_read_cursor_pos(int *rows, int *cols);
  27int term_read_window_size(int *rows, int *cols);
  28int term_poll_key(int timeout);
  29int term_read_key(void);
  30void term_write(char *str);
  31void term_writef(const char *format, ...);
  32void term_flush(void);
  

• src/libterm.h [new file]

  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