diff options
Diffstat (limited to 'lib/isc/unix/keyboard.c')
| -rw-r--r-- | lib/isc/unix/keyboard.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/lib/isc/unix/keyboard.c b/lib/isc/unix/keyboard.c new file mode 100644 index 000000000000..8ee62d3f5906 --- /dev/null +++ b/lib/isc/unix/keyboard.c @@ -0,0 +1,126 @@ +/* + * Copyright (C) 2004, 2007 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 2000, 2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE + * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +/* $Id: keyboard.c,v 1.13 2007/06/19 23:47:18 tbox Exp $ */ + +#include <config.h> + +#include <sys/param.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/uio.h> + +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <termios.h> +#include <unistd.h> +#include <fcntl.h> + +#include <isc/keyboard.h> +#include <isc/util.h> + +isc_result_t +isc_keyboard_open(isc_keyboard_t *keyboard) { + int fd; + isc_result_t ret; + struct termios current_mode; + + REQUIRE(keyboard != NULL); + + fd = open("/dev/tty", O_RDONLY, 0); + if (fd < 0) + return (ISC_R_IOERROR); + + keyboard->fd = fd; + + if (tcgetattr(fd, &keyboard->saved_mode) < 0) { + ret = ISC_R_IOERROR; + goto errout; + } + + current_mode = keyboard->saved_mode; + + current_mode.c_iflag &= + ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON); + current_mode.c_oflag &= ~OPOST; + current_mode.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); + current_mode.c_cflag &= ~(CSIZE|PARENB); + current_mode.c_cflag |= CS8; + + current_mode.c_cc[VMIN] = 1; + current_mode.c_cc[VTIME] = 0; + if (tcsetattr(fd, TCSAFLUSH, ¤t_mode) < 0) { + ret = ISC_R_IOERROR; + goto errout; + } + + keyboard->result = ISC_R_SUCCESS; + + return (ISC_R_SUCCESS); + + errout: + close (fd); + + return (ret); +} + +isc_result_t +isc_keyboard_close(isc_keyboard_t *keyboard, unsigned int sleeptime) { + REQUIRE(keyboard != NULL); + + if (sleeptime > 0 && keyboard->result != ISC_R_CANCELED) + (void)sleep(sleeptime); + + (void)tcsetattr(keyboard->fd, TCSAFLUSH, &keyboard->saved_mode); + (void)close(keyboard->fd); + + keyboard->fd = -1; + + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_keyboard_getchar(isc_keyboard_t *keyboard, unsigned char *cp) { + ssize_t cc; + unsigned char c; + cc_t *controlchars; + + REQUIRE(keyboard != NULL); + REQUIRE(cp != NULL); + + cc = read(keyboard->fd, &c, 1); + if (cc < 0) { + keyboard->result = ISC_R_IOERROR; + return (keyboard->result); + } + + controlchars = keyboard->saved_mode.c_cc; + if (c == controlchars[VINTR] || c == controlchars[VQUIT]) { + keyboard->result = ISC_R_CANCELED; + return (keyboard->result); + } + + *cp = c; + + return (ISC_R_SUCCESS); +} + +isc_boolean_t +isc_keyboard_canceled(isc_keyboard_t *keyboard) { + return (ISC_TF(keyboard->result == ISC_R_CANCELED)); +} |