IEEE 802.15.4 subsystem
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| Source at commit ae1455cc7dadfaa494c792217d1e4a53efb2747e created 7 years 1 month ago. By Stefan Schmidt, atusb-eui64: print out set address with upper case characters in hex | |
|---|---|
| 1 | /* |
| 2 | * lib/getkey.c - Get single characters from standard input |
| 3 | * |
| 4 | * Written 2011 by Werner Almesberger |
| 5 | * Copyright 2011 Werner Almesberger |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | |
| 14 | #include <stdlib.h> |
| 15 | #include <stdio.h> |
| 16 | #include <unistd.h> |
| 17 | #include <fcntl.h> |
| 18 | #include <termios.h> |
| 19 | #include <errno.h> |
| 20 | |
| 21 | |
| 22 | |
| 23 | static struct termios old_term; |
| 24 | |
| 25 | |
| 26 | static void restore_term(void) |
| 27 | { |
| 28 | if (tcsetattr(0, TCSAFLUSH, &old_term) < 0) |
| 29 | perror("tcsetattr"); |
| 30 | } |
| 31 | |
| 32 | |
| 33 | void get_key_init(void) |
| 34 | { |
| 35 | static int initialized = 0; |
| 36 | struct termios term; |
| 37 | |
| 38 | if (initialized) |
| 39 | return; |
| 40 | initialized = 1; |
| 41 | |
| 42 | if (tcgetattr(0, &old_term) < 0) { |
| 43 | perror("tcgetattr"); |
| 44 | exit(1); |
| 45 | } |
| 46 | term = old_term; |
| 47 | cfmakeraw(&term); |
| 48 | if (tcsetattr(0, TCSAFLUSH, &term) < 0) { |
| 49 | perror("tcsetattr"); |
| 50 | exit(1); |
| 51 | } |
| 52 | atexit(restore_term); |
| 53 | if (fcntl(0, F_SETFL, O_NONBLOCK) < 0) { |
| 54 | perror("fcntl"); |
| 55 | exit(1); |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | |
| 60 | char get_key(void) |
| 61 | { |
| 62 | ssize_t got; |
| 63 | char ch; |
| 64 | |
| 65 | get_key_init(); |
| 66 | got = read(0, &ch, 1); |
| 67 | if (got == 1) |
| 68 | return ch; |
| 69 | if (got >= 0) { |
| 70 | fprintf(stderr, "unexpected read() return value %d\n", |
| 71 | (int) got); |
| 72 | exit(1); |
| 73 | } |
| 74 | if (errno == EAGAIN) |
| 75 | return 0; |
| 76 | perror("read"); |
| 77 | exit(1); |
| 78 | } |
| 79 | |
