external/bsd/ntp/dist/lib/isc/unix/keyboard.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: keyboard.c,v 1.13 2007/06/19 23:47:18 tbox Exp */
  21
  22 #include <config.h>
  23
  24 #include <sys/param.h>
  25 #include <sys/types.h>
  26 #include <sys/time.h>
  27 #include <sys/uio.h>
  28
  29 #include <errno.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <termios.h>
  33 #include <unistd.h>
  34 #include <fcntl.h>
  35
  36 #include <isc/keyboard.h>
  37 #include <isc/util.h>
  38
  39 isc_result_t
  40 isc_keyboard_open(isc_keyboard_t *keyboard) {
  41         int fd;
  42         isc_result_t ret;
  43         struct termios current_mode;
  44
  45         REQUIRE(keyboard != NULL);
  46
  47         fd = open("/dev/tty", O_RDONLY, 0);
  48         if (fd < 0)
  49                 return (ISC_R_IOERROR);
  50
  51         keyboard->fd = fd;
  52
  53         if (tcgetattr(fd, &keyboard->saved_mode) < 0) {
  54                 ret = ISC_R_IOERROR;
  55                 goto errout;
  56         }
  57
  58         current_mode = keyboard->saved_mode;
  59
  60         current_mode.c_iflag &=
  61                         ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
  62         current_mode.c_oflag &= ~OPOST;
  63         current_mode.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
  64         current_mode.c_cflag &= ~(CSIZE|PARENB);
  65         current_mode.c_cflag |= CS8;
  66
  67         current_mode.c_cc[VMIN] = 1;
  68         current_mode.c_cc[VTIME] = 0;
  69         if (tcsetattr(fd, TCSAFLUSH, &current_mode) < 0) {
  70                 ret = ISC_R_IOERROR;
  71                 goto errout;
  72         }
  73
  74         keyboard->result = ISC_R_SUCCESS;
  75
  76         return (ISC_R_SUCCESS);
  77
  78  errout:
  79         close (fd);
  80
  81         return (ret);
  82 }
  83
  84 isc_result_t
  85 isc_keyboard_close(isc_keyboard_t *keyboard, unsigned int sleeptime) {
  86         REQUIRE(keyboard != NULL);
  87
  88         if (sleeptime > 0 && keyboard->result != ISC_R_CANCELED)
  89                 (void)sleep(sleeptime);
  90
  91         (void)tcsetattr(keyboard->fd, TCSAFLUSH, &keyboard->saved_mode);
  92         (void)close(keyboard->fd);
  93
  94         keyboard->fd = -1;
  95
  96         return (ISC_R_SUCCESS);
  97 }
  98
  99 isc_result_t
 100 isc_keyboard_getchar(isc_keyboard_t *keyboard, unsigned char *cp) {
 101         ssize_t cc;
 102         unsigned char c;
 103         cc_t *controlchars;
 104
 105         REQUIRE(keyboard != NULL);
 106         REQUIRE(cp != NULL);
 107
 108         cc = read(keyboard->fd, &c, 1);
 109         if (cc < 0) {
 110                 keyboard->result = ISC_R_IOERROR;
 111                 return (keyboard->result);
 112         }
 113
 114         controlchars = keyboard->saved_mode.c_cc;
 115         if (c == controlchars[VINTR] || c == controlchars[VQUIT]) {
 116                 keyboard->result = ISC_R_CANCELED;
 117                 return (keyboard->result);
 118         }
 119
 120         *cp = c;
 121
 122         return (ISC_R_SUCCESS);
 123 }
 124
 125 isc_boolean_t
 126 isc_keyboard_canceled(isc_keyboard_t *keyboard) {
 127         return (ISC_TF(keyboard->result == ISC_R_CANCELED));
 128 }