termios/cfsetspeed.c

   1 /* Copyright (C) 1992-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <termios.h>
  19 #include <errno.h>
  20 #include <stddef.h>
  21
  22 struct speed_struct
  23 {
  24   speed_t value;
  25   speed_t internal;
  26 };
  27
  28 static const struct speed_struct speeds[] =
  29   {
  30 #ifdef B0
  31     { 0, B0 },
  32 #endif
  33 #ifdef B50
  34     { 50, B50 },
  35 #endif
  36 #ifdef B75
  37     { 75, B75 },
  38 #endif
  39 #ifdef B110
  40     { 110, B110 },
  41 #endif
  42 #ifdef B134
  43     { 134, B134 },
  44 #endif
  45 #ifdef B150
  46     { 150, B150 },
  47 #endif
  48 #ifdef B200
  49     { 200, B200 },
  50 #endif
  51 #ifdef B300
  52     { 300, B300 },
  53 #endif
  54 #ifdef B600
  55     { 600, B600 },
  56 #endif
  57 #ifdef B1200
  58     { 1200, B1200 },
  59 #endif
  60 #ifdef B1200
  61     { 1200, B1200 },
  62 #endif
  63 #ifdef B1800
  64     { 1800, B1800 },
  65 #endif
  66 #ifdef B2400
  67     { 2400, B2400 },
  68 #endif
  69 #ifdef B4800
  70     { 4800, B4800 },
  71 #endif
  72 #ifdef B9600
  73     { 9600, B9600 },
  74 #endif
  75 #ifdef B19200
  76     { 19200, B19200 },
  77 #endif
  78 #ifdef B38400
  79     { 38400, B38400 },
  80 #endif
  81 #ifdef B57600
  82     { 57600, B57600 },
  83 #endif
  84 #ifdef B76800
  85     { 76800, B76800 },
  86 #endif
  87 #ifdef B115200
  88     { 115200, B115200 },
  89 #endif
  90 #ifdef B153600
  91     { 153600, B153600 },
  92 #endif
  93 #ifdef B230400
  94     { 230400, B230400 },
  95 #endif
  96 #ifdef B307200
  97     { 307200, B307200 },
  98 #endif
  99 #ifdef B460800
 100     { 460800, B460800 },
 101 #endif
 102 #ifdef B500000
 103     { 500000, B500000 },
 104 #endif
 105 #ifdef B576000
 106     { 576000, B576000 },
 107 #endif
 108 #ifdef B921600
 109     { 921600, B921600 },
 110 #endif
 111 #ifdef B1000000
 112     { 1000000, B1000000 },
 113 #endif
 114 #ifdef B1152000
 115     { 1152000, B1152000 },
 116 #endif
 117 #ifdef B1500000
 118     { 1500000, B1500000 },
 119 #endif
 120 #ifdef B2000000
 121     { 2000000, B2000000 },
 122 #endif
 123 #ifdef B2500000
 124     { 2500000, B2500000 },
 125 #endif
 126 #ifdef B3000000
 127     { 3000000, B3000000 },
 128 #endif
 129 #ifdef B3500000
 130     { 3500000, B3500000 },
 131 #endif
 132 #ifdef B4000000
 133     { 4000000, B4000000 },
 134 #endif
 135   };
 136
 137
 138 /* Set both the input and output baud rates stored in *TERMIOS_P to SPEED.  */
 139 int
 140 cfsetspeed (struct termios *termios_p, speed_t speed)
 141 {
 142   size_t cnt;
 143
 144   for (cnt = 0; cnt < sizeof (speeds) / sizeof (speeds[0]); ++cnt)
 145     if (speed == speeds[cnt].internal)
 146       {
 147         cfsetispeed (termios_p, speed);
 148         cfsetospeed (termios_p, speed);
 149         return 0;
 150       }
 151     else if (speed == speeds[cnt].value)
 152       {
 153         cfsetispeed (termios_p, speeds[cnt].internal);
 154         cfsetospeed (termios_p, speeds[cnt].internal);
 155         return 0;
 156       }
 157
 158   __set_errno (EINVAL);
 159
 160   return -1;
 161 }