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term.c
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term.c
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/* vi: set sw=4 ts=4:
*
* term.c
*
* General purpose terminal handling library.
*
* by Nick Patavalis ([email protected])
*
* originaly by Pantelis Antoniou (https://github.com/pantoniou),
* Nick Patavalis
*
* Documentation can be found in the header file "term.h".
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
* $Id$
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <termios.h>
#ifdef USE_FLOCK
#include <sys/file.h>
#endif
/* glibc for MIPS has its own bits/termios.h which does not define
* CMSPAR, so we use the value from the generic bits/termios.h
*/
#ifdef __linux__
#ifndef CMSPAR
#define CMSPAR 010000000000
#endif
#endif
/* Some BSDs (and possibly other systems too) have no mark / space
* parity support, and they don't define CMSPAR. Use a zero CMSPAR in
* these cases. If the user tries to set P_MARK or P_SPACE he will get
* P_EVEN or P_ODD instead. */
#ifndef CMSPAR
#define CMSPAR 0
#endif
/* On these systems, use the TIOCM[BIS|BIC|GET] ioctls to manipulate
* the modem control lines (DTR / RTS) */
#if defined(__linux__) || \
defined(__FreeBSD__) || defined(__OpenBSD__) || \
defined(__NetBSD__) || defined(__DragonFly__) || \
defined(__APPLE__)
#define USE_IOCTL
#endif
#ifdef USE_IOCTL
#include <sys/ioctl.h>
#endif
#include "custbaud.h"
#ifdef USE_CUSTOM_BAUD
#include CUSTOM_BAUD_HEAD
#endif
/* Time to wait for UART to clear after a drain (in usec). */
#define DRAIN_DELAY 200000
#include "term.h"
/***************************************************************************/
static struct term_s {
int init;
int fd[MAX_TERMS];
struct termios origtermios[MAX_TERMS];
struct termios currtermios[MAX_TERMS];
struct termios nexttermios[MAX_TERMS];
} term;
/***************************************************************************/
int term_errno;
static const char * const term_err_str[] = {
[TERM_EOK] = "No error",
[TERM_ENOINIT] = "Framework is uninitialized",
[TERM_EFULL] = "Framework is full",
[TERM_ENOTFOUND] = "Filedes not in the framework",
[TERM_EEXISTS] = "Filedes already in the framework",
[TERM_EATEXIT] = "Cannot install atexit handler",
[TERM_EISATTY] = "Filedes is not a tty",
[TERM_EFLUSH] = "Cannot flush the device",
[TERM_EGETATTR] = "Cannot get the device attributes",
[TERM_ESETATTR] = "Cannot set the device attributes",
[TERM_EBAUD] = "Invalid baud rate",
[TERM_ESETOSPEED] = "Cannot set the output speed",
[TERM_ESETISPEED] = "Cannot set the input speed",
[TERM_EGETSPEED] = "Cannot decode speed",
[TERM_EPARITY] = "Invalid parity mode",
[TERM_EDATABITS] = "Invalid number of databits",
[TERM_ESTOPBITS] = "Invalid number of stopbits",
[TERM_EFLOW] = "Invalid flowcontrol mode",
[TERM_EDTRDOWN] = "Cannot lower DTR",
[TERM_EDTRUP] = "Cannot raise DTR",
[TERM_EMCTL] = "Cannot get mctl status",
[TERM_EDRAIN] = "Cannot drain the device",
[TERM_EBREAK] = "Cannot send break sequence",
[TERM_ERTSDOWN] = "Cannot lower RTS",
[TERM_ERTSUP] = "Cannot raise RTS"
};
static char term_err_buff[1024];
const char *
term_strerror (int terrnum, int errnum)
{
const char *rval;
switch(terrnum) {
case TERM_EFLUSH:
case TERM_EGETATTR:
case TERM_ESETATTR:
case TERM_ESETOSPEED:
case TERM_ESETISPEED:
case TERM_EDRAIN:
case TERM_EBREAK:
snprintf(term_err_buff, sizeof(term_err_buff),
"%s: %s", term_err_str[terrnum], strerror(errnum));
rval = term_err_buff;
break;
case TERM_EOK:
case TERM_ENOINIT:
case TERM_EFULL:
case TERM_ENOTFOUND:
case TERM_EEXISTS:
case TERM_EATEXIT:
case TERM_EISATTY:
case TERM_EBAUD:
case TERM_EPARITY:
case TERM_EDATABITS:
case TERM_ESTOPBITS:
case TERM_EFLOW:
case TERM_EDTRDOWN:
case TERM_EDTRUP:
case TERM_EMCTL:
case TERM_ERTSDOWN:
case TERM_ERTSUP:
snprintf(term_err_buff, sizeof(term_err_buff),
"%s", term_err_str[terrnum]);
rval = term_err_buff;
break;
default:
rval = NULL;
break;
}
return rval;
}
int
term_perror (const char *prefix)
{
return fprintf(stderr, "%s %s\n",
prefix, term_strerror(term_errno, errno));
}
/***************************************************************************/
#define BNONE 0xFFFFFFFF
struct baud_codes {
int speed;
speed_t code;
} baud_table[] = {
{ 0, B0 },
{ 50, B50 },
{ 75, B75 },
{ 110, B110 },
{ 134, B134 },
{ 150, B150 },
{ 200, B200 },
{ 300, B300 },
{ 600, B600 },
{ 1200, B1200 },
{ 1800, B1800 },
{ 2400, B2400 },
{ 4800, B4800 },
{ 9600, B9600 },
{ 19200, B19200 },
{ 38400, B38400 },
{ 57600, B57600 },
{ 115200, B115200 },
#ifdef HIGH_BAUD
#ifdef B230400
{ 230400, B230400 },
#endif
#ifdef B460800
{ 460800, B460800 },
#endif
#ifdef B500000
{ 500000, B500000 },
#endif
#ifdef B576000
{ 576000, B576000 },
#endif
#ifdef B921600
{ 921600, B921600 },
#endif
#ifdef B1000000
{ 1000000, B1000000 },
#endif
#ifdef B1152000
{ 1152000, B1152000 },
#endif
#ifdef B1500000
{ 1500000, B1500000 },
#endif
#ifdef B2000000
{ 2000000, B2000000 },
#endif
#ifdef B2500000
{ 2500000, B2500000 },
#endif
#ifdef B3000000
{ 3000000, B3000000 },
#endif
#ifdef B3500000
{ 3500000, B3500000 },
#endif
#ifdef B4000000
{ 4000000, B4000000 },
#endif
#endif /* of HIGH_BAUD */
};
#define BAUD_TABLE_SZ ((int)(sizeof(baud_table) / sizeof(baud_table[0])))
int
term_baud_up (int baud)
{
int i;
for (i = 0; i < BAUD_TABLE_SZ; i++) {
if ( baud >= baud_table[i].speed )
continue;
else {
baud = baud_table[i].speed;
break;
}
}
return baud;
}
int
term_baud_down (int baud)
{
int i;
for (i = BAUD_TABLE_SZ - 1; i >= 0; i--) {
if ( baud <= baud_table[i].speed )
continue;
else {
baud = baud_table[i].speed;
break;
}
}
return baud;
}
static speed_t
Bcode(int speed)
{
speed_t code = BNONE;
int i;
for (i = 0; i < BAUD_TABLE_SZ; i++) {
if ( baud_table[i].speed == speed ) {
code = baud_table[i].code;
break;
}
}
return code;
}
static int
Bspeed(speed_t code)
{
int speed = -1, i;
for (i = 0; i < BAUD_TABLE_SZ; i++) {
if ( baud_table[i].code == code ) {
speed = baud_table[i].speed;
break;
}
}
return speed;
}
int
term_baud_ok(int baud)
{
if ( use_custom_baud() )
return (baud >= 0);
else
return (Bcode(baud) != BNONE) ? 1 : 0;
}
int
term_baud_std(int baud)
{
return (Bcode(baud) != BNONE) ? 1 : 0;
}
/**************************************************************************/
static int
term_find_next_free (void)
{
int rval, i;
do { /* dummy */
if ( ! term.init ) {
term_errno = TERM_ENOINIT;
rval = -1;
break;
}
for (i = 0; i < MAX_TERMS; i++)
if ( term.fd[i] == -1 ) break;
if ( i == MAX_TERMS ) {
term_errno = TERM_EFULL;
rval = -1;
break;
}
rval = i;
} while (0);
return rval;
}
/***************************************************************************/
static int
term_find (int fd)
{
int rval, i;
do { /* dummy */
if ( ! term.init ) {
term_errno = TERM_ENOINIT;
rval = -1;
break;
}
for (i = 0; i < MAX_TERMS; i++)
if (term.fd[i] == fd) break;
if ( i == MAX_TERMS ) {
term_errno = TERM_ENOTFOUND;
rval = -1;
break;
}
rval = i;
} while (0);
return rval;
}
/***************************************************************************/
static void
term_exitfunc (void)
{
int r, i;
do { /* dummy */
if ( ! term.init )
break;
for (i = 0; i < MAX_TERMS; i++) {
if (term.fd[i] == -1)
continue;
term_drain(term.fd[i]);
tcflush(term.fd[i], TCIFLUSH);
do {
r = tcsetattr(term.fd[i], TCSANOW, &term.origtermios[i]);
} while ( r < 0 && errno == EINTR );
if ( r < 0 ) {
const char *tname;
tname = ttyname(term.fd[i]);
if ( ! tname ) tname = "UNKNOWN";
fprintf(stderr, "%s: reset failed for dev %s: %s\r\n",
__FUNCTION__, tname, strerror(errno));
}
#ifdef USE_FLOCK
/* Explicitly unlock the file. If the file is not in fact
flock(2)'ed, no harm is done. This should normally not
be necessary. Normally, exiting the program should take
care of unlocking the file. Unfortuntelly, it has been
observed that, on some systems, exiting or closing an
flock(2)'ed tty fd has peculiar side effects (like not
reseting the modem-control lines, even if HUPCL is
set). */
flock(term.fd[i], LOCK_UN);
#endif
close(term.fd[i]);
term.fd[i] = -1;
}
} while (0);
}
/***************************************************************************/
int
term_lib_init (void)
{
int rval, r, i;
rval = 0;
do { /* dummy */
if ( term.init ) {
/* reset all terms back to their original settings */
for (i = 0; i < MAX_TERMS; i++) {
if (term.fd[i] == -1)
continue;
tcflush(term.fd[i], TCIOFLUSH);
do {
r = tcsetattr(term.fd[i], TCSANOW, &term.origtermios[i]);
} while ( r < 0 && errno == EINTR );
if ( r < 0 ) {
const char *tname;
tname = ttyname(term.fd[i]);
if ( ! tname ) tname = "UNKNOWN";
fprintf(stderr, "%s: reset failed for dev %s: %s\n",
__FUNCTION__, tname, strerror(errno));
}
term.fd[i] = -1;
}
} else {
/* initialize term structure. */
for (i = 0; i < MAX_TERMS; i++)
term.fd[i] = -1;
if ( atexit(term_exitfunc) != 0 ) {
term_errno = TERM_EATEXIT;
rval = -1;
break;
}
/* ok. term struct is now initialized. */
term.init = 1;
}
} while(0);
return rval;
}
/***************************************************************************/
int
term_add (int fd)
{
int rval, r, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i >= 0 ) {
term_errno = TERM_EEXISTS;
rval = -1;
break;
}
if ( ! isatty(fd) ) {
term_errno = TERM_EISATTY;
rval = -1;
break;
}
i = term_find_next_free();
if ( i < 0 ) {
rval = -1;
break;
}
r = tcgetattr(fd, &term.origtermios[i]);
if ( r < 0 ) {
term_errno = TERM_EGETATTR;
rval = -1;
break;
}
term.currtermios[i] = term.origtermios[i];
term.nexttermios[i] = term.origtermios[i];
term.fd[i] = fd;
} while (0);
return rval;
}
/***************************************************************************/
int
term_remove(int fd)
{
int rval, r, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
do { /* dummy */
r = tcflush(term.fd[i], TCIOFLUSH);
if ( r < 0 ) {
term_errno = TERM_EFLUSH;
rval = -1;
break;
}
r = tcsetattr(term.fd[i], TCSANOW, &term.origtermios[i]);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
} while (0);
term.fd[i] = -1;
} while (0);
return rval;
}
/***************************************************************************/
int
term_erase(int fd)
{
int rval, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
term.fd[i] = -1;
} while (0);
return rval;
}
/***************************************************************************/
int
term_replace (int oldfd, int newfd)
{
int rval, r, i;
rval = 0;
do { /* dummy */
i = term_find(oldfd);
if ( i < 0 ) {
rval = -1;
break;
}
r = tcsetattr(newfd, TCSANOW, &term.currtermios[i]);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
r = tcgetattr(newfd, &term.currtermios[i]);
if ( r < 0 ) {
term_errno = TERM_EGETATTR;
rval = -1;
break;
}
term.fd[i] = newfd;
} while (0);
return rval;
}
/***************************************************************************/
int
term_reset (int fd)
{
int rval, r, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
r = tcflush(term.fd[i], TCIOFLUSH);
if ( r < 0 ) {
term_errno = TERM_EFLUSH;
rval = -1;
break;
}
r = tcsetattr(term.fd[i], TCSANOW, &term.origtermios[i]);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
r = tcgetattr(term.fd[i], &term.currtermios[i]);
if ( r < 0 ) {
term_errno = TERM_EGETATTR;
rval = -1;
break;
}
term.nexttermios[i] = term.currtermios[i];
} while (0);
return rval;
}
/***************************************************************************/
int
term_revert (int fd)
{
int rval, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
term.nexttermios[i] = term.currtermios[i];
} while (0);
return rval;
}
/***************************************************************************/
int
term_refresh (int fd)
{
int rval, r, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
r = tcgetattr(fd, &term.currtermios[i]);
if ( r < 0 ) {
term_errno = TERM_EGETATTR;
rval = -1;
break;
}
} while (0);
return rval;
}
/***************************************************************************/
int
term_apply (int fd, int now)
{
int when, rval, r, i;
when = now ? TCSANOW : TCSAFLUSH;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
r = tcsetattr(term.fd[i], when, &term.nexttermios[i]);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
r = tcgetattr(term.fd[i], &term.nexttermios[i]);
if ( r < 0 ) {
term_errno = TERM_EGETATTR;
rval = -1;
break;
}
term.currtermios[i] = term.nexttermios[i];
/* Set HUPCL to origtermios as well. Since setting HUPCL
affects the behavior on close(2), we most likely want it to
also apply when the filedes is implicitly closed by
exit(3)ing the program. Since, uppon exiting, we restore
the original settings, this wouldn't happen unless we also
set HUPCL to origtermios. */
if ( term.currtermios[i].c_cflag & HUPCL )
term.origtermios[i].c_cflag |= HUPCL;
else
term.origtermios[i].c_cflag &= ~HUPCL;
} while (0);
return rval;
}
/***************************************************************************/
int
term_set_raw (int fd)
{
int rval, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
/* BSD raw mode */
cfmakeraw(&term.nexttermios[i]);
/* one byte at a time, no timer */
term.nexttermios[i].c_cc[VMIN] = 1;
term.nexttermios[i].c_cc[VTIME] = 0;
} while (0);
return rval;
}
/***************************************************************************/
int
term_set_baudrate (int fd, int baudrate)
{
int rval, r, i;
speed_t spd;
struct termios tio;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
tio = term.nexttermios[i];
spd = Bcode(baudrate);
if ( spd != BNONE ) {
r = cfsetospeed(&tio, spd);
if ( r < 0 ) {
term_errno = TERM_ESETOSPEED;
rval = -1;
break;
}
/* ispeed = 0, means same as ospeed (see POSIX) */
cfsetispeed(&tio, B0);
} else {
if ( ! use_custom_baud() ) {
term_errno = TERM_EBAUD;
rval = -1;
break;
}
r = cfsetospeed_custom(&tio, baudrate);
if ( r < 0 ) {
term_errno = TERM_ESETOSPEED;
rval = -1;
break;
}
/* ispeed = 0, means same as ospeed (see POSIX) */
cfsetispeed(&tio, B0);
}
term.nexttermios[i] = tio;
} while (0);
return rval;
}
int
term_get_baudrate (int fd, int *ispeed)
{
speed_t code;
int i, ospeed;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
ospeed = -1;
break;
}
if ( ispeed ) {
code = cfgetispeed(&term.currtermios[i]);
*ispeed = Bspeed(code);
if ( use_custom_baud() ) {
if ( *ispeed < 0 ) {
*ispeed = cfgetispeed_custom(&term.currtermios[i]);
}
}
}
code = cfgetospeed(&term.currtermios[i]);
ospeed = Bspeed(code);
if ( ospeed < 0 ) {
if ( ! use_custom_baud() ) {
term_errno = TERM_EGETSPEED;
break;
}
ospeed = cfgetospeed_custom(&term.currtermios[i]);
if ( ospeed < 0 ) {
term_errno = TERM_EGETSPEED;
}
}
} while (0);
return ospeed;
}
/***************************************************************************/
int
term_set_parity (int fd, enum parity_e parity)
{
int rval, i;
struct termios *tiop;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
tiop = &term.nexttermios[i];
switch (parity) {
case P_EVEN:
tiop->c_cflag &= ~(PARODD | CMSPAR);
tiop->c_cflag |= PARENB;
break;
case P_ODD:
tiop->c_cflag &= ~CMSPAR;
tiop->c_cflag |= PARENB | PARODD;
break;
case P_MARK:
tiop->c_cflag |= PARENB | PARODD | CMSPAR;
break;
case P_SPACE:
tiop->c_cflag &= ~PARODD;
tiop->c_cflag |= PARENB | CMSPAR;
break;
case P_NONE:
tiop->c_cflag &= ~(PARENB | PARODD | CMSPAR);
break;
default:
term_errno = TERM_EPARITY;
rval = -1;
break;
}
if ( rval < 0 ) break;
} while (0);
return rval;
}
enum parity_e
term_get_parity (int fd)
{
tcflag_t flg;
int i;
enum parity_e parity;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
parity = P_ERROR;
break;
}
flg = term.currtermios[i].c_cflag;
if ( ! (flg & PARENB) ) {
parity = P_NONE;
} else if ( flg & CMSPAR ) {
parity = (flg & PARODD) ? P_MARK : P_SPACE;
} else {
parity = (flg & PARODD) ? P_ODD : P_EVEN;
}
} while (0);
return parity;
}
/***************************************************************************/
int
term_set_databits (int fd, int databits)
{
int rval, i;
struct termios *tiop;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
tiop = &term.nexttermios[i];
switch (databits) {
case 5:
tiop->c_cflag = (tiop->c_cflag & ~CSIZE) | CS5;
break;
case 6:
tiop->c_cflag = (tiop->c_cflag & ~CSIZE) | CS6;
break;
case 7:
tiop->c_cflag = (tiop->c_cflag & ~CSIZE) | CS7;
break;
case 8:
tiop->c_cflag = (tiop->c_cflag & ~CSIZE) | CS8;
break;
default:
term_errno = TERM_EDATABITS;
rval = -1;
break;
}
if ( rval < 0 ) break;