root / prex-0.9.0 / usr / lib / libsa / _stdio.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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2 | * Copyright (c) 2005-2006, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/prex.h> |
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31 | |||
32 | extern void (*__cleanup)(void); /* in exit() */ |
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33 | |||
34 | void __console_write(char *, size_t); |
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35 | char __console_read(void); |
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36 | |||
37 | |||
38 | static device_t __console_dev;
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39 | |||
40 | static int init_done = 0; |
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41 | |||
42 | static void |
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43 | __stdio_exit(void)
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44 | { |
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45 | |||
46 | if (__console_dev)
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47 | device_close(__console_dev); |
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48 | init_done = 0;
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49 | } |
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50 | |||
51 | static void |
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52 | __stdio_init(void)
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53 | { |
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54 | |||
55 | device_open("tty", 0, &__console_dev); |
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56 | __cleanup = __stdio_exit; |
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57 | init_done = 1;
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58 | } |
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59 | |||
60 | void
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61 | __console_write(char *buf, size_t len)
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62 | { |
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63 | |||
64 | if (init_done == 0) |
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65 | __stdio_init(); |
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66 | |||
67 | device_write(__console_dev, buf, &len, 0);
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68 | } |
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69 | |||
70 | char
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71 | __console_read(void)
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72 | { |
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73 | char ch;
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74 | size_t len = 1;
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75 | |||
76 | if (init_done == 0) |
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77 | __stdio_init(); |
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78 | |||
79 | device_read(__console_dev, &ch, &len, 0);
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80 | return ch;
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81 | } |