lib/sh/shtty.c

   1 /*
   2  * shtty.c -- abstract interface to the terminal, focusing on capabilities.
   3  */
   4
   5 /* Copyright (C) 1999 Free Software Foundation, Inc.
   6
   7    This file is part of GNU Bush, the Bourne Again SHell.
   8
   9    Bush is free software: you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation, either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    Bush is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with Bush.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #ifdef HAVE_CONFIG_H
  24 #  include <config.h>
  25 #endif
  26
  27 #ifdef HAVE_UNISTD_H
  28 #  include <unistd.h>
  29 #endif
  30
  31 #include <shtty.h>
  32
  33 static TTYSTRUCT ttin, ttout;
  34 static int ttsaved = 0;
  35
  36 int
  37 ttgetattr(fd, ttp)
  38 int     fd;
  39 TTYSTRUCT *ttp;
  40 {
  41 #ifdef TERMIOS_TTY_DRIVER
  42   return tcgetattr(fd, ttp);
  43 #else
  44 #  ifdef TERMIO_TTY_DRIVER
  45   return ioctl(fd, TCGETA, ttp);
  46 #  else
  47   return ioctl(fd, TIOCGETP, ttp);
  48 #  endif
  49 #endif
  50 }
  51
  52 int
  53 ttsetattr(fd, ttp)
  54 int     fd;
  55 TTYSTRUCT *ttp;
  56 {
  57 #ifdef TERMIOS_TTY_DRIVER
  58   return tcsetattr(fd, TCSADRAIN, ttp);
  59 #else
  60 #  ifdef TERMIO_TTY_DRIVER
  61   return ioctl(fd, TCSETAW, ttp);
  62 #  else
  63   return ioctl(fd, TIOCSETN, ttp);
  64 #  endif
  65 #endif
  66 }
  67
  68 void
  69 ttsave()
  70 {
  71   if (ttsaved)
  72    return;
  73   ttgetattr (0, &ttin);
  74   ttgetattr (1, &ttout);
  75   ttsaved = 1;
  76 }
  77
  78 void
  79 ttrestore()
  80 {
  81   if (ttsaved == 0)
  82     return;
  83   ttsetattr (0, &ttin);
  84   ttsetattr (1, &ttout);
  85   ttsaved = 0;
  86 }
  87
  88 /* Retrieve the internally-saved attributes associated with tty fd FD. */
  89 TTYSTRUCT *
  90 ttattr (fd)
  91      int fd;
  92 {
  93   if (ttsaved == 0)
  94     return ((TTYSTRUCT *)0);
  95   if (fd == 0)
  96     return &ttin;
  97   else if (fd == 1)
  98     return &ttout;
  99   else
 100     return ((TTYSTRUCT *)0);
 101 }
 102
 103 /*
 104  * Change attributes in ttp so that when it is installed using
 105  * ttsetattr, the terminal will be in one-char-at-a-time mode.
 106  */
 107 int
 108 tt_setonechar(ttp)
 109      TTYSTRUCT *ttp;
 110 {
 111 #if defined (TERMIOS_TTY_DRIVER) || defined (TERMIO_TTY_DRIVER)
 112
 113   /* XXX - might not want this -- it disables erase and kill processing. */
 114   ttp->c_lflag &= ~ICANON;
 115
 116   ttp->c_lflag |= ISIG;
 117 #  ifdef IEXTEN
 118   ttp->c_lflag |= IEXTEN;
 119 #  endif
 120
 121   ttp->c_iflag |= ICRNL;        /* make sure we get CR->NL on input */
 122   ttp->c_iflag &= ~INLCR;       /* but no NL->CR */
 123
 124 #  ifdef OPOST
 125   ttp->c_oflag |= OPOST;
 126 #  endif
 127 #  ifdef ONLCR
 128   ttp->c_oflag |= ONLCR;
 129 #  endif
 130 #  ifdef OCRNL
 131   ttp->c_oflag &= ~OCRNL;
 132 #  endif
 133 #  ifdef ONOCR
 134   ttp->c_oflag &= ~ONOCR;
 135 #  endif
 136 #  ifdef ONLRET
 137   ttp->c_oflag &= ~ONLRET;
 138 #  endif
 139
 140   ttp->c_cc[VMIN] = 1;
 141   ttp->c_cc[VTIME] = 0;
 142
 143 #else
 144
 145   ttp->sg_flags |= CBREAK;
 146
 147 #endif
 148
 149   return 0;
 150 }
 151
 152 /* Set the tty associated with FD and TTP into one-character-at-a-time mode */
 153 int
 154 ttfd_onechar (fd, ttp)
 155      int fd;
 156      TTYSTRUCT *ttp;
 157 {
 158   if (tt_setonechar(ttp) < 0)
 159     return -1;
 160   return (ttsetattr (fd, ttp));
 161 }
 162
 163 /* Set the terminal into one-character-at-a-time mode */
 164 int
 165 ttonechar ()
 166 {
 167   TTYSTRUCT tt;
 168
 169   if (ttsaved == 0)
 170     return -1;
 171   tt = ttin;
 172   return (ttfd_onechar (0, &tt));
 173 }
 174
 175 /*
 176  * Change attributes in ttp so that when it is installed using
 177  * ttsetattr, the terminal will be in no-echo mode.
 178  */
 179 int
 180 tt_setnoecho(ttp)
 181      TTYSTRUCT *ttp;
 182 {
 183 #if defined (TERMIOS_TTY_DRIVER) || defined (TERMIO_TTY_DRIVER)
 184   ttp->c_lflag &= ~(ECHO|ECHOK|ECHONL);
 185 #else
 186   ttp->sg_flags &= ~ECHO;
 187 #endif
 188
 189   return 0;
 190 }
 191
 192 /* Set the tty associated with FD and TTP into no-echo mode */
 193 int
 194 ttfd_noecho (fd, ttp)
 195      int fd;
 196      TTYSTRUCT *ttp;
 197 {
 198   if (tt_setnoecho (ttp) < 0)
 199     return -1;
 200   return (ttsetattr (fd, ttp));
 201 }
 202
 203 /* Set the terminal into no-echo mode */
 204 int
 205 ttnoecho ()
 206 {
 207   TTYSTRUCT tt;
 208
 209   if (ttsaved == 0)
 210     return -1;
 211   tt = ttin;
 212   return (ttfd_noecho (0, &tt));
 213 }
 214
 215 /*
 216  * Change attributes in ttp so that when it is installed using
 217  * ttsetattr, the terminal will be in eight-bit mode (pass8).
 218  */
 219 int
 220 tt_seteightbit (ttp)
 221      TTYSTRUCT *ttp;
 222 {
 223 #if defined (TERMIOS_TTY_DRIVER) || defined (TERMIO_TTY_DRIVER)
 224   ttp->c_iflag &= ~ISTRIP;
 225   ttp->c_cflag |= CS8;
 226   ttp->c_cflag &= ~PARENB;
 227 #else
 228   ttp->sg_flags |= ANYP;
 229 #endif
 230
 231   return 0;
 232 }
 233
 234 /* Set the tty associated with FD and TTP into eight-bit mode */
 235 int
 236 ttfd_eightbit (fd, ttp)
 237      int fd;
 238      TTYSTRUCT *ttp;
 239 {
 240   if (tt_seteightbit (ttp) < 0)
 241     return -1;
 242   return (ttsetattr (fd, ttp));
 243 }
 244
 245 /* Set the terminal into eight-bit mode */
 246 int
 247 tteightbit ()
 248 {
 249   TTYSTRUCT tt;
 250
 251   if (ttsaved == 0)
 252     return -1;
 253   tt = ttin;
 254   return (ttfd_eightbit (0, &tt));
 255 }
 256
 257 /*
 258  * Change attributes in ttp so that when it is installed using
 259  * ttsetattr, the terminal will be in non-canonical input mode.
 260  */
 261 int
 262 tt_setnocanon (ttp)
 263      TTYSTRUCT *ttp;
 264 {
 265 #if defined (TERMIOS_TTY_DRIVER) || defined (TERMIO_TTY_DRIVER)
 266   ttp->c_lflag &= ~ICANON;
 267 #endif
 268
 269   return 0;
 270 }
 271
 272 /* Set the tty associated with FD and TTP into non-canonical mode */
 273 int
 274 ttfd_nocanon (fd, ttp)
 275      int fd;
 276      TTYSTRUCT *ttp;
 277 {
 278   if (tt_setnocanon (ttp) < 0)
 279     return -1;
 280   return (ttsetattr (fd, ttp));
 281 }
 282
 283 /* Set the terminal into non-canonical mode */
 284 int
 285 ttnocanon ()
 286 {
 287   TTYSTRUCT tt;
 288
 289   if (ttsaved == 0)
 290     return -1;
 291   tt = ttin;
 292   return (ttfd_nocanon (0, &tt));
 293 }
 294
 295 /*
 296  * Change attributes in ttp so that when it is installed using
 297  * ttsetattr, the terminal will be in cbreak, no-echo mode.
 298  */
 299 int
 300 tt_setcbreak(ttp)
 301      TTYSTRUCT *ttp;
 302 {
 303   if (tt_setonechar (ttp) < 0)
 304     return -1;
 305   return (tt_setnoecho (ttp));
 306 }
 307
 308 /* Set the tty associated with FD and TTP into cbreak (no-echo,
 309    one-character-at-a-time) mode */
 310 int
 311 ttfd_cbreak (fd, ttp)
 312      int fd;
 313      TTYSTRUCT *ttp;
 314 {
 315   if (tt_setcbreak (ttp) < 0)
 316     return -1;
 317   return (ttsetattr (fd, ttp));
 318 }
 319
 320 /* Set the terminal into cbreak (no-echo, one-character-at-a-time) mode */
 321 int
 322 ttcbreak ()
 323 {
 324   TTYSTRUCT tt;
 325
 326   if (ttsaved == 0)
 327     return -1;
 328   tt = ttin;
 329   return (ttfd_cbreak (0, &tt));
 330 }