contrib/bind-9.5.2/lib/isc/unix/keyboard.c

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