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    Contents of /trunk/mkinitrd-magellan/busybox/libbb/speed_table.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 2047 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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 "libbb.h"
    11
    12 struct speed_map {
    13 unsigned short speed;
    14 unsigned short value;
    15 };
    16
    17 static const struct speed_map speeds[] = {
    18 {B0, 0},
    19 {B50, 50},
    20 {B75, 75},
    21 {B110, 110},
    22 {B134, 134},
    23 {B150, 150},
    24 {B200, 200},
    25 {B300, 300},
    26 {B600, 600},
    27 {B1200, 1200},
    28 {B1800, 1800},
    29 {B2400, 2400},
    30 {B4800, 4800},
    31 {B9600, 9600},
    32 #ifdef B19200
    33 {B19200, 19200},
    34 #elif defined(EXTA)
    35 {EXTA, 19200},
    36 #endif
    37 #ifdef B38400
    38 {B38400, 38400/256 + 0x8000U},
    39 #elif defined(EXTB)
    40 {EXTB, 38400/256 + 0x8000U},
    41 #endif
    42 #ifdef B57600
    43 {B57600, 57600/256 + 0x8000U},
    44 #endif
    45 #ifdef B115200
    46 {B115200, 115200/256 + 0x8000U},
    47 #endif
    48 #ifdef B230400
    49 {B230400, 230400/256 + 0x8000U},
    50 #endif
    51 #ifdef B460800
    52 {B460800, 460800/256 + 0x8000U},
    53 #endif
    54 #ifdef B921600
    55 {B921600, 921600/256 + 0x8000U},
    56 #endif
    57 };
    58
    59 enum { NUM_SPEEDS = ARRAY_SIZE(speeds) };
    60
    61 unsigned FAST_FUNC tty_baud_to_value(speed_t speed)
    62 {
    63 int i = 0;
    64
    65 do {
    66 if (speed == speeds[i].speed) {
    67 if (speeds[i].value & 0x8000U) {
    68 return ((unsigned long) (speeds[i].value) & 0x7fffU) * 256;
    69 }
    70 return speeds[i].value;
    71 }
    72 } while (++i < NUM_SPEEDS);
    73
    74 return 0;
    75 }
    76
    77 speed_t FAST_FUNC tty_value_to_baud(unsigned int value)
    78 {
    79 int i = 0;
    80
    81 do {
    82 if (value == tty_baud_to_value(speeds[i].speed)) {
    83 return speeds[i].speed;
    84 }
    85 } while (++i < NUM_SPEEDS);
    86
    87 return (speed_t) - 1;
    88 }
    89
    90 #if 0
    91 /* testing code */
    92 #include <stdio.h>
    93
    94 int main(void)
    95 {
    96 unsigned long v;
    97 speed_t s;
    98
    99 for (v = 0 ; v < 1000000; v++) {
    100 s = tty_value_to_baud(v);
    101 if (s == (speed_t) -1) {
    102 continue;
    103 }
    104 printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
    105 }
    106
    107 printf("-------------------------------\n");
    108
    109 for (s = 0 ; s < 010017+1; s++) {
    110 v = tty_baud_to_value(s);
    111 if (!v) {
    112 continue;
    113 }
    114 printf("v = %lu -- s = %0lo\n", v, (unsigned long) s);
    115 }
    116
    117 return 0;
    118 }
    119 #endif