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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.
*
* Nick Patavalis (npat@inaccessnetworks.com)
*
* originaly by Pantelis Antoniou (panto@intranet.gr), 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>
#ifdef __linux__
#include <termio.h>
#else
#include <termios.h>
#endif /* of __linux__ */
#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_EPARITY] = "Invalid parity mode",
[TERM_EDATABITS] = "Invalid number of databits",
[TERM_EFLOW] = "Invalid flowcontrol mode",
[TERM_EDTRDOWN] = "Cannot lower DTR",
[TERM_EDTRUP] = "Cannot raise DTR",
[TERM_EDRAIN] = "Cannot drain the device",
[TERM_EBREAK] = "Cannot send break sequence"
};
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_EFLOW:
case TERM_EDTRDOWN:
case TERM_EDTRUP:
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));
}
/***************************************************************************/
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;
do { /* dummy */
r = tcflush(term.fd[i], TCIOFLUSH);
if ( r < 0 ) break;
r = tcsetattr(term.fd[i], TCSAFLUSH, &term.origtermios[i]);
if ( r < 0 ) break;
} while (0);
if ( r < 0 ) {
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;
}
} 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;
do {
r = tcflush(term.fd[i], TCIOFLUSH);
if ( r < 0 ) break;
r = tcsetattr(term.fd[i], TCSAFLUSH, &term.origtermios[i]);
if ( r < 0 ) break;
} while (0);
if ( r < 0 ) {
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], TCSAFLUSH, &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, TCSAFLUSH, &term.currtermios[i]);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
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], TCSAFLUSH, &term.origtermios[i]);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
term.currtermios[i] = term.origtermios[i];
term.nexttermios[i] = term.origtermios[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 rval, r, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
r = tcsetattr(term.fd[i], TCSAFLUSH, &term.nexttermios[i]);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
term.currtermios[i] = term.nexttermios[i];
} 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];
switch (baudrate) {
case 0:
spd = B0;
break;
case 50:
spd = B50;
break;
case 75:
spd = B75;
break;
case 110:
spd = B110;
break;
case 134:
spd = B134;
break;
case 150:
spd = B150;
break;
case 200:
spd = B200;
break;
case 300:
spd = B300;
break;
case 600:
spd = B600;
break;
case 1200:
spd = B1200;
break;
case 1800:
spd = B1800;
break;
case 2400:
spd = B2400;
break;
case 4800:
spd = B4800;
break;
case 9600:
spd = B9600;
break;
case 19200:
spd = B19200;
break;
case 38400:
spd = B38400;
break;
case 57600:
spd = B57600;
break;
case 115200:
spd = B115200;
break;
#ifdef HIGH_BAUD
case 230400:
spd = B230400;
break;
case 460800:
spd = B460800;
break;
case 921600:
spd = B921600;
break;
#endif
default:
term_errno = TERM_EBAUD;
rval = -1;
break;
}
if ( rval < 0 ) break;
r = cfsetospeed(&tio, spd);
if ( r < 0 ) {
term_errno = TERM_ESETOSPEED;
rval = -1;
break;
}
r = cfsetispeed(&tio, spd);
if ( r < 0 ) {
term_errno = TERM_ESETISPEED;
rval = -1;
break;
}
term.nexttermios[i] = tio;
} while (0);
return rval;
}
/***************************************************************************/
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;
tiop->c_cflag |= PARENB;
break;
case P_ODD:
tiop->c_cflag |= PARENB | PARODD;
break;
case P_NONE:
tiop->c_cflag &= ~(PARENB | PARODD);
break;
default:
term_errno = TERM_EPARITY;
rval = -1;
break;
}
if ( rval < 0 ) break;
} while (0);
return rval;
}
/***************************************************************************/
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;
} while (0);
return rval;
}
/***************************************************************************/
int
term_set_flowcntrl (int fd, enum flowcntrl_e flowcntl)
{
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 (flowcntl) {
case FC_RTSCTS:
tiop->c_cflag |= CRTSCTS;
tiop->c_iflag &= ~(IXON | IXOFF | IXANY);
break;
case FC_XONXOFF:
tiop->c_cflag &= ~(CRTSCTS);
tiop->c_iflag |= IXON | IXOFF;
break;
case FC_NONE:
tiop->c_cflag &= ~(CRTSCTS);
tiop->c_iflag &= ~(IXON | IXOFF | IXANY);
break;
default:
term_errno = TERM_EFLOW;
rval = -1;
break;
}
if ( rval < 0 ) break;
} while (0);
return rval;
}
/***************************************************************************/
int
term_set_local(int fd, int local)
{
int rval, i;
struct termios *tiop;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
tiop = &term.nexttermios[i];
if ( local )
tiop->c_cflag |= CLOCAL;
else
tiop->c_cflag &= ~CLOCAL;
} while (0);
return rval;
}
/***************************************************************************/
int
term_set_hupcl (int fd, int on)
{
int rval, i;
struct termios *tiop;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
tiop = &term.nexttermios[i];
if ( on )
tiop->c_cflag |= HUPCL;
else
tiop->c_cflag &= ~HUPCL;
} while (0);
return rval;
}
/***************************************************************************/
int
term_set(int fd,
int raw,
int baud, enum parity_e parity, int bits, enum flowcntrl_e fc,
int local, int hup_close)
{
int rval, r, i, ni;
struct termios tio;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
ni = term_add(fd);
if ( ni < 0 ) {
rval = -1;
break;
}
} else {
ni = i;
}
tio = term.nexttermios[ni];
do { /* dummy */
if (raw) {
r = term_set_raw(fd);
if ( r < 0 ) { rval = -1; break; }
}
r = term_set_baudrate(fd, baud);
if ( r < 0 ) { rval = -1; break; }
r = term_set_parity(fd, parity);
if ( r < 0 ) { rval = -1; break; }
r = term_set_databits(fd, bits);
if ( r < 0 ) { rval = -1; break; }
r = term_set_flowcntrl(fd, fc);
if ( r < 0 ) { rval = -1; break; }
r = term_set_local(fd, local);
if ( r < 0 ) { rval = -1; break; }
r = term_set_hupcl(fd, hup_close);
if ( r < 0 ) { rval = -1; break; }
} while (0);
if ( rval < 0 ) {
if ( i < 0 )
/* new addition. must be removed */
term.fd[ni] = -1;
else
/* just revert to previous settings */
term.nexttermios[ni] = tio;
}
} while (0);
return rval;
}
/***************************************************************************/
int
term_pulse_dtr (int fd)
{
int rval, r, i;
rval = 0;
do { /* dummy */
i = term_find(fd);
if ( i < 0 ) {
rval = -1;
break;
}
#ifdef __linux__
{
int opins = TIOCM_DTR;
r = ioctl(fd, TIOCMBIC, &opins);
if ( r < 0 ) {
term_errno = TERM_EDTRDOWN;
rval = -1;
break;
}
sleep(1);
r = ioctl(fd, TIOCMBIS, &opins);
if ( r < 0 ) {
term_errno = TERM_EDTRUP;
rval = -1;
break;
}
}
#else
{
struct termios tio, tioold;
r = tcgetattr(fd, &tio);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
tioold = tio;
cfsetospeed(&tio, B0);
cfsetispeed(&tio, B0);
r = tcsetattr(fd, TCSANOW, &tio);
if ( r < 0 ) {
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
sleep(1);
r = tcsetattr(fd, TCSANOW, &tioold);
if ( r < 0 ) {
term.currtermios[i] = tio;
term_errno = TERM_ESETATTR;
rval = -1;
break;
}
}
#endif /* of __linux__ */