diff options
Diffstat (limited to 'usr.bin/systat/keyboard.c')
| -rw-r--r-- | usr.bin/systat/keyboard.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/usr.bin/systat/keyboard.c b/usr.bin/systat/keyboard.c new file mode 100644 index 000000000000..3d7ee43fd80b --- /dev/null +++ b/usr.bin/systat/keyboard.c @@ -0,0 +1,176 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1980, 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + + + +#include <sys/select.h> +#include <sys/time.h> + +#include <errno.h> +#include <ctype.h> +#include <stdlib.h> +#include <termios.h> +#include <unistd.h> + +#include "systat.h" +#include "extern.h" + +static char line[80]; +static int keyboard_dispatch(int ch); + +int +keyboard(void) +{ + int ch, n; + struct timeval last, intvl, now, tm; + fd_set rfds; + + /* Set initial timings */ + gettimeofday(&last, NULL); + intvl.tv_sec = delay / 1000000; + intvl.tv_usec = delay % 1000000; + for (;;) { + col = 0; + move(CMDLINE, 0); + for (;;) { + /* Determine interval to sleep */ + (void)gettimeofday(&now, NULL); + tm.tv_sec = last.tv_sec + intvl.tv_sec - now.tv_sec; + tm.tv_usec = last.tv_usec + intvl.tv_usec - now.tv_usec; + while (tm.tv_usec < 0) { + tm.tv_usec += 1000000; + tm.tv_sec--; + } + while (tm.tv_usec >= 1000000) { + tm.tv_usec -= 1000000; + tm.tv_sec++; + } + if (tm.tv_sec < 0) { + /* We have to update screen immediately */ + display(); + gettimeofday(&last, NULL); + continue; + } + + /* Prepare select */ + FD_ZERO(&rfds); + FD_SET(STDIN_FILENO, &rfds); + n = select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tm); + + if (n > 0) { + /* Read event on stdin */ + ch = getch(); + + if (keyboard_dispatch(ch) == 0) { + refresh(); + continue; + } + + line[col] = '\0'; + command(line + 1); + /* Refresh delay */ + intvl.tv_sec = delay / 1000000; + intvl.tv_usec = delay % 1000000; + refresh(); + break; + } + + if (n < 0 && errno != EINTR) + exit(1); + + /* Timeout or signal. Call display another time */ + display(); + gettimeofday(&last, NULL); + } + } +} + +static int +keyboard_dispatch(int ch) +{ + + if (ch == ERR) { + if (errno == EINTR) + return 0; + exit(1); + } + if (ch >= 'A' && ch <= 'Z') + ch += 'a' - 'A'; + if (col == 0) { + if (ch == CTRL('l')) { + wrefresh(curscr); + return 0; + } + if (ch == CTRL('g')) { + status(); + return 0; + } + if (ch != ':') + return 0; + move(CMDLINE, 0); + clrtoeol(); + } + if (ch == erasechar() && col > 0) { + if (col == 1 && line[0] == ':') + return 0; + col--; + goto doerase; + } + if (ch == CTRL('w') && col > 0) { + while (--col >= 0 && isspace(line[col])) + ; + col++; + while (--col >= 0 && !isspace(line[col])) + if (col == 0 && line[0] == ':') + return 1; + col++; + goto doerase; + } + if (ch == killchar() && col > 0) { + col = 0; + if (line[0] == ':') + col++; +doerase: + move(CMDLINE, col); + clrtoeol(); + return 0; + } + if (isprint(ch) || ch == ' ') { + line[col] = ch; + mvaddch(CMDLINE, col, ch); + col++; + } + + if (col == 0 || (ch != '\r' && ch != '\n')) + return 0; + + return 1; +} |