Contents of /tags/mkinitrd-6_1_2/busybox/libbb/speed_table.c
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Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
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Mon May 4 17:23:09 2009 UTC (15 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2011 byte(s)
tagged 'mkinitrd-6_1_2'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * compact speed_t <-> speed functions for busybox |
4 | * |
5 | * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | #include <termios.h> |
11 | #include "libbb.h" |
12 | |
13 | struct speed_map { |
14 | unsigned short speed; |
15 | unsigned short value; |
16 | }; |
17 | |
18 | static const struct speed_map speeds[] = { |
19 | {B0, 0}, |
20 | {B50, 50}, |
21 | {B75, 75}, |
22 | {B110, 110}, |
23 | {B134, 134}, |
24 | {B150, 150}, |
25 | {B200, 200}, |
26 | {B300, 300}, |
27 | {B600, 600}, |
28 | {B1200, 1200}, |
29 | {B1800, 1800}, |
30 | {B2400, 2400}, |
31 | {B4800, 4800}, |
32 | {B9600, 9600}, |
33 | #ifdef B19200 |
34 | {B19200, 19200}, |
35 | #elif defined(EXTA) |
36 | {EXTA, 19200}, |
37 | #endif |
38 | #ifdef B38400 |
39 | {B38400, 38400/256 + 0x8000U}, |
40 | #elif defined(EXTB) |
41 | {EXTB, 38400/256 + 0x8000U}, |
42 | #endif |
43 | #ifdef B57600 |
44 | {B57600, 57600/256 + 0x8000U}, |
45 | #endif |
46 | #ifdef B115200 |
47 | {B115200, 115200/256 + 0x8000U}, |
48 | #endif |
49 | #ifdef B230400 |
50 | {B230400, 230400/256 + 0x8000U}, |
51 | #endif |
52 | #ifdef B460800 |
53 | {B460800, 460800/256 + 0x8000U}, |
54 | #endif |
55 | }; |
56 | |
57 | enum { NUM_SPEEDS = ARRAY_SIZE(speeds) }; |
58 | |
59 | unsigned FAST_FUNC tty_baud_to_value(speed_t speed) |
60 | { |
61 | int i = 0; |
62 | |
63 | do { |
64 | if (speed == speeds[i].speed) { |
65 | if (speeds[i].value & 0x8000U) { |
66 | return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256; |
67 | } |
68 | return speeds[i].value; |
69 | } |
70 | } while (++i < NUM_SPEEDS); |
71 | |
72 | return 0; |
73 | } |
74 | |
75 | speed_t FAST_FUNC tty_value_to_baud(unsigned int value) |
76 | { |
77 | int i = 0; |
78 | |
79 | do { |
80 | if (value == tty_baud_to_value(speeds[i].speed)) { |
81 | return speeds[i].speed; |
82 | } |
83 | } while (++i < NUM_SPEEDS); |
84 | |
85 | return (speed_t) - 1; |
86 | } |
87 | |
88 | #if 0 |
89 | /* testing code */ |
90 | #include <stdio.h> |
91 | |
92 | int main(void) |
93 | { |
94 | unsigned long v; |
95 | speed_t s; |
96 | |
97 | for (v = 0 ; v < 500000; v++) { |
98 | s = tty_value_to_baud(v); |
99 | if (s == (speed_t) -1) { |
100 | continue; |
101 | } |
102 | printf("v = %lu -- s = %0lo\n", v, (unsigned long) s); |
103 | } |
104 | |
105 | printf("-------------------------------\n"); |
106 | |
107 | for (s = 0 ; s < 010017+1; s++) { |
108 | v = tty_baud_to_value(s); |
109 | if (!v) { |
110 | continue; |
111 | } |
112 | printf("v = %lu -- s = %0lo\n", v, (unsigned long) s); |
113 | } |
114 | |
115 | return 0; |
116 | } |
117 | #endif |