release/src/router/libncurses/ncurses/tinfo/lib_baudrate.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
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   5  * copy of this software and associated documentation files (the            *
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  11  *                                                                          *
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  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996-on                 *
  33  ****************************************************************************/
  34
  35 /*
  36  *      lib_baudrate.c
  37  *
  38  */
  39
  40 #include <curses.priv.h>
  41 #include <termcap.h>            /* ospeed */
  42 #if defined(__FreeBSD__)
  43 #include <sys/param.h>
  44 #endif
  45
  46 /*
  47  * These systems use similar header files, which define B1200 as 1200, etc.,
  48  * but can be overridden by defining USE_OLD_TTY so B1200 is 9, which makes all
  49  * of the indices up to B115200 fit nicely in a 'short', allowing us to retain
  50  * ospeed's type for compatibility.
  51  */
  52 #if (defined(__FreeBSD__) && (__FreeBSD_version < 700000)) || defined(__NetBSD__) || defined(__OpenBSD__)
  53 #undef B0
  54 #undef B50
  55 #undef B75
  56 #undef B110
  57 #undef B134
  58 #undef B150
  59 #undef B200
  60 #undef B300
  61 #undef B600
  62 #undef B1200
  63 #undef B1800
  64 #undef B2400
  65 #undef B4800
  66 #undef B9600
  67 #undef B19200
  68 #undef EXTA
  69 #undef B38400
  70 #undef EXTB
  71 #undef B57600
  72 #undef B115200
  73 #undef B230400
  74 #undef B460800
  75 #undef B921600
  76 #define USE_OLD_TTY
  77 #include <sys/ttydev.h>
  78 #else
  79 #undef USE_OLD_TTY
  80 #endif /* USE_OLD_TTY */
  81
  82 MODULE_ID("$Id: lib_baudrate.c,v 1.31 2010/12/19 01:50:50 tom Exp $")
  83
  84 /*
  85  *      int
  86  *      baudrate()
  87  *
  88  *      Returns the current terminal's baud rate.
  89  *
  90  */
  91
  92 struct speed {
  93     int s;                      /* value for 'ospeed' is an index */
  94     int sp;                     /* the actual speed */
  95 };
  96
  97 static struct speed const speeds[] =
  98 {
  99     {B0, 0},
 100     {B50, 50},
 101     {B75, 75},
 102     {B110, 110},
 103     {B134, 134},
 104     {B150, 150},
 105     {B200, 200},
 106     {B300, 300},
 107     {B600, 600},
 108     {B1200, 1200},
 109     {B1800, 1800},
 110     {B2400, 2400},
 111     {B4800, 4800},
 112     {B9600, 9600},
 113 #ifdef B19200
 114     {B19200, 19200},
 115 #else
 116 #ifdef EXTA
 117     {EXTA, 19200},
 118 #endif
 119 #endif
 120 #ifdef B38400
 121     {B38400, 38400},
 122 #else
 123 #ifdef EXTB
 124     {EXTB, 38400},
 125 #endif
 126 #endif
 127 #ifdef B57600
 128     {B57600, 57600},
 129 #endif
 130 #ifdef B115200
 131     {B115200, 115200},
 132 #endif
 133 #ifdef B230400
 134     {B230400, 230400},
 135 #endif
 136 #ifdef B460800
 137     {B460800, 460800},
 138 #endif
 139 #ifdef B921600
 140     {B921600, 921600},
 141 #endif
 142 };
 143
 144 NCURSES_EXPORT(int)
 145 _nc_baudrate(int OSpeed)
 146 {
 147 #if !USE_REENTRANT
 148     static int last_OSpeed;
 149     static int last_baudrate;
 150 #endif
 151
 152     int result = ERR;
 153     unsigned i;
 154
 155 #if !USE_REENTRANT
 156     if (OSpeed == last_OSpeed) {
 157         result = last_baudrate;
 158     }
 159 #endif
 160     if (result == ERR) {
 161         if (OSpeed >= 0) {
 162             for (i = 0; i < SIZEOF(speeds); i++) {
 163                 if (speeds[i].s == OSpeed) {
 164                     result = speeds[i].sp;
 165                     break;
 166                 }
 167             }
 168         }
 169 #if !USE_REENTRANT
 170         if (OSpeed == last_OSpeed) {
 171             last_OSpeed = OSpeed;
 172             last_baudrate = result;
 173         }
 174 #endif
 175     }
 176     return (result);
 177 }
 178
 179 NCURSES_EXPORT(int)
 180 _nc_ospeed(int BaudRate)
 181 {
 182     int result = 1;
 183     unsigned i;
 184
 185     if (BaudRate >= 0) {
 186         for (i = 0; i < SIZEOF(speeds); i++) {
 187             if (speeds[i].sp == BaudRate) {
 188                 result = speeds[i].s;
 189                 break;
 190             }
 191         }
 192     }
 193     return (result);
 194 }
 195
 196 NCURSES_EXPORT(int)
 197 NCURSES_SP_NAME(baudrate) (NCURSES_SP_DCL0)
 198 {
 199     int result;
 200
 201     T((T_CALLED("baudrate(%p)"), (void *) SP_PARM));
 202
 203     /*
 204      * In debugging, allow the environment symbol to override when we're
 205      * redirecting to a file, so we can construct repeatable test-cases
 206      * that take into account costs that depend on baudrate.
 207      */
 208 #ifdef TRACE
 209     if (IsValidTIScreen(SP_PARM)
 210         && !isatty(fileno(SP_PARM ? SP_PARM->_ofp : stdout))
 211         && getenv("BAUDRATE") != 0) {
 212         int ret;
 213         if ((ret = _nc_getenv_num("BAUDRATE")) <= 0)
 214             ret = 9600;
 215         ospeed = (NCURSES_OSPEED) _nc_ospeed(ret);
 216         returnCode(ret);
 217     }
 218 #endif
 219
 220     if (IsValidTIScreen(SP_PARM)) {
 221 #ifdef USE_OLD_TTY
 222         result = cfgetospeed(&(TerminalOf(SP_PARM)->Nttyb));
 223         ospeed = _nc_ospeed(result);
 224 #else /* !USE_OLD_TTY */
 225 #ifdef TERMIOS
 226         ospeed = (NCURSES_OSPEED) cfgetospeed(&(TerminalOf(SP_PARM)->Nttyb));
 227 #else
 228         ospeed = (NCURSES_OSPEED) TerminalOf(SP_PARM)->Nttyb.sg_ospeed;
 229 #endif
 230         result = _nc_baudrate(ospeed);
 231 #endif
 232         TerminalOf(SP_PARM)->_baudrate = result;
 233     } else {
 234         result = ERR;
 235     }
 236
 237     returnCode(result);
 238 }
 239
 240 #if NCURSES_SP_FUNCS
 241 NCURSES_EXPORT(int)
 242 baudrate(void)
 243 {
 244     return NCURSES_SP_NAME(baudrate) (CURRENT_SCREEN);
 245 }
 246 #endif