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jim-tty.c
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jim-tty.c
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/*
* Support for tty settings using termios
*
* (c) 2016 Steve Bennett <steveb@workware.net.au>
*
*/
/* termios support is required */
#include <jim-tty.h>
#include <sys/ioctl.h>
#include <termios.h>
static const struct {
unsigned baud;
speed_t speed;
} baudtable[] = {
{ 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 B230400
{ 230400, B230400 },
#endif
#ifdef B460800
{ 460800, B460800 }
#endif
};
struct flag_name_map {
const char *name;
unsigned value;
};
static const struct flag_name_map parity_map[] = {
{ "none", 0 },
{ "even", PARENB },
{ "odd", PARENB | PARODD },
};
static const struct flag_name_map data_size_map[] = {
{ "5", CS5 },
{ "6", CS6 },
{ "7", CS7 },
{ "8", CS8 },
};
static const struct flag_name_map stop_size_map[] = {
{ "1", 0 },
{ "2", CSTOPB },
};
static const struct flag_name_map input_map[] = {
{ "raw", 0 },
{ "cooked", ICANON },
};
static const struct flag_name_map output_map[] = {
{ "raw", 0 },
{ "cooked", OPOST },
};
static const char * const tty_settings_names[] = {
"baud",
"data",
"handshake",
"input",
"output",
"parity",
"stop",
"vmin",
"vtime",
"echo",
"vstart",
"vstop",
NULL
};
enum {
OPT_BAUD,
OPT_DATA,
OPT_HANDSHAKE,
OPT_INPUT,
OPT_OUTPUT,
OPT_PARITY,
OPT_STOP,
OPT_VMIN,
OPT_VTIME,
OPT_ECHO,
OPT_VSTART,
OPT_VSTOP,
};
#define ARRAYSIZE(A) (sizeof(A)/sizeof(*(A)))
/**
* Search the flag/name map for an entry with the given name.
* (Actually, just matching the first char)
* Returns a pointer to the entry if found, or NULL if not.
*/
static const struct flag_name_map *flag_name_to_value(const struct flag_name_map *map, int len, const char *name)
{
int i;
for (i = 0; i < len; i++) {
/* Only need to compare the first character since all names are unique in the first char */
if (*name == *map[i].name) {
return &map[i];
}
}
return NULL;
}
/**
* Search the flag/name map for an entry with the matching value.
* Returns the corresponding name if found, or NULL if no match.
*/
static const char *flag_value_to_name(const struct flag_name_map *map, int len, unsigned value)
{
int i;
for (i = 0; i < len; i++) {
if (value == map[i].value) {
return map[i].name;
}
}
return NULL;
}
/**
* If 'str2' is not NULL, appends 'str1' and 'str2' to the list.
* Otherwise does nothing.
*/
static void JimListAddPair(Jim_Interp *interp, Jim_Obj *listObjPtr, const char *str1, const char *str2)
{
if (str2) {
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, str1, -1));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, str2, -1));
}
}
Jim_Obj *Jim_GetTtySettings(Jim_Interp *interp, int fd)
{
struct termios tio;
size_t i;
const char *p;
Jim_Obj *listObjPtr;
speed_t speed;
int baud;
if (tcgetattr(fd, &tio) < 0) {
return NULL;
}
listObjPtr = Jim_NewListObj(interp, NULL, 0);
p = flag_value_to_name(parity_map, ARRAYSIZE(parity_map), tio.c_cflag & (PARENB | PARODD));
JimListAddPair(interp, listObjPtr, "parity", p);
p = flag_value_to_name(data_size_map, ARRAYSIZE(data_size_map), tio.c_cflag & CSIZE);
JimListAddPair(interp, listObjPtr, "data", p);
p = flag_value_to_name(stop_size_map, ARRAYSIZE(stop_size_map), tio.c_cflag & CSTOPB);
JimListAddPair(interp, listObjPtr, "stop", p);
if (tio.c_iflag & (IXON | IXOFF)) {
p = "xonxoff";
}
else if (tio.c_cflag & CRTSCTS) {
p = "rtscts";
}
else {
p = "none";
}
JimListAddPair(interp, listObjPtr, "handshake", p);
p = flag_value_to_name(input_map, ARRAYSIZE(input_map), tio.c_lflag & ICANON);
JimListAddPair(interp, listObjPtr, "input", p);
p = flag_value_to_name(output_map, ARRAYSIZE(output_map), tio.c_oflag & OPOST);
JimListAddPair(interp, listObjPtr, "output", p);
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, "vmin", -1));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewIntObj(interp, tio.c_cc[VMIN]));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, "vtime", -1));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewIntObj(interp, tio.c_cc[VTIME]));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, "vstart", -1));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewIntObj(interp, tio.c_cc[VSTART]));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, "vstop", -1));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewIntObj(interp, tio.c_cc[VSTOP]));
speed = cfgetispeed(&tio);
baud = 0;
for (i = 0; i < sizeof(baudtable) / sizeof(*baudtable); i++) {
if (baudtable[i].speed == speed) {
baud = baudtable[i].baud;
break;
}
}
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, "baud", -1));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewIntObj(interp, baud));
return listObjPtr;
}
int Jim_SetTtySettings(Jim_Interp *interp, int fd, Jim_Obj *dictObjPtr)
{
int len = Jim_ListLength(interp, dictObjPtr);
int i;
struct termios tio;
if (tcgetattr(fd, &tio) < 0) {
return -1;
}
for (i = 0; i < len; i += 2) {
Jim_Obj *nameObj = Jim_ListGetIndex(interp, dictObjPtr, i);
Jim_Obj *valueObj = Jim_ListGetIndex(interp, dictObjPtr, i + 1);
int opt;
const struct flag_name_map *p;
long l;
size_t j;
if (Jim_GetEnum(interp, nameObj, tty_settings_names, &opt, "setting", JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
return JIM_ERR;
}
switch (opt) {
case OPT_BAUD:
if (Jim_GetLong(interp, valueObj, &l) != JIM_OK) {
goto badvalue;
}
for (j = 0; j < ARRAYSIZE(baudtable); j++) {
if (baudtable[j].baud == l) {
break;
}
}
if (j == ARRAYSIZE(baudtable)) {
goto badvalue;
}
cfsetospeed(&tio, baudtable[j].speed);
cfsetispeed(&tio, baudtable[j].speed);
break;
case OPT_PARITY:
p = flag_name_to_value(parity_map, ARRAYSIZE(parity_map), Jim_String(valueObj));
if (p == NULL) {
badvalue:
Jim_SetResultFormatted(interp, "bad value for %#s: %#s", nameObj, valueObj);
return JIM_ERR;
}
tio.c_cflag &= ~(PARENB | PARODD);
tio.c_cflag |= p->value;
break;
case OPT_STOP:
p = flag_name_to_value(stop_size_map, ARRAYSIZE(stop_size_map), Jim_String(valueObj));
if (p == NULL) {
goto badvalue;
}
tio.c_cflag &= ~CSTOPB;
tio.c_cflag |= p->value;
break;
case OPT_DATA:
p = flag_name_to_value(data_size_map, ARRAYSIZE(data_size_map), Jim_String(valueObj));
if (p == NULL) {
goto badvalue;
}
tio.c_cflag &= ~CSIZE;
tio.c_cflag |= p->value;
break;
case OPT_HANDSHAKE:
tio.c_iflag &= ~(IXON | IXOFF);
tio.c_cflag &= ~(CRTSCTS);
if (Jim_CompareStringImmediate(interp, valueObj, "xonxoff")) {
tio.c_iflag |= (IXON | IXOFF);
}
else if (Jim_CompareStringImmediate(interp, valueObj, "rtscts")) {
tio.c_cflag |= CRTSCTS;
}
else if (!Jim_CompareStringImmediate(interp, valueObj, "none")) {
goto badvalue;
}
break;
case OPT_VMIN:
case OPT_VTIME:
case OPT_VSTART:
case OPT_VSTOP:
if (Jim_GetLong(interp, valueObj, &l) != JIM_OK) {
goto badvalue;
}
switch (opt) {
case OPT_VMIN: tio.c_cc[VMIN] = l; break;
case OPT_VTIME: tio.c_cc[VTIME] = l; break;
case OPT_VSTART: tio.c_cc[VSTART] = l; break;
case OPT_VSTOP: tio.c_cc[VSTOP] = l; break;
}
break;
case OPT_OUTPUT:
p = flag_name_to_value(output_map, ARRAYSIZE(output_map), Jim_String(valueObj));
if (p == NULL) {
goto badvalue;
}
tio.c_oflag &= ~OPOST;
tio.c_oflag |= p->value;
break;
case OPT_INPUT:
p = flag_name_to_value(input_map, ARRAYSIZE(input_map), Jim_String(valueObj));
if (p == NULL) {
goto badvalue;
}
if (p->value) {
tio.c_lflag |= (ECHO | ECHOE | ECHOK | ECHONL | ICANON | IEXTEN | ISIG | NOFLSH | TOSTOP);
tio.c_iflag |= ICRNL;
}
else {
tio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL | ICANON | IEXTEN | ISIG | NOFLSH | TOSTOP);
tio.c_iflag &= ~ICRNL;
}
break;
case OPT_ECHO:
if (Jim_GetLong(interp, valueObj, &l) != JIM_OK) {
goto badvalue;
}
if (l) {
tio.c_lflag |= ECHO;
}
else {
tio.c_lflag &= ~ECHO;
}
break;
}
}
if (tcsetattr(fd, TCSAFLUSH, &tio) < 0) {
return -1;
}
return 0;
}
Jim_Obj *Jim_GetTtyControlSettings(Jim_Interp *interp, int fd)
{
size_t i;
Jim_Obj *listObjPtr;
int status;
static const struct {
const char * const name;
int value;
} modem_signals[] = {
{ "rts", TIOCM_RTS },
{ "dtr", TIOCM_DTR },
{ "dcd", TIOCM_CAR },
{ "dsr", TIOCM_DSR },
{ "ring", TIOCM_RNG },
{ "cts", TIOCM_CTS },
};
if (ioctl(fd, TIOCMGET, &status) < 0) {
return NULL;
}
listObjPtr = Jim_NewListObj(interp, NULL, 0);
for (i = 0; i < ARRAYSIZE(modem_signals); i++) {
Jim_ListAppendElement(interp, listObjPtr, Jim_NewStringObj(interp, modem_signals[i].name, -1));
Jim_ListAppendElement(interp, listObjPtr, Jim_NewIntObj(interp, (status & modem_signals[i].value & status) != 0));
}
return listObjPtr;
}
int Jim_SetTtyControlSettings(Jim_Interp *interp, int fd, Jim_Obj *dictObjPtr)
{
static const char * const modem_signal_names[] = {
"rts", "dtr", "break", NULL
};
enum { OPT_RTS, OPT_DTR, OPT_BREAK, };
int len = Jim_ListLength(interp, dictObjPtr);
int i;
int status;
/* Get the current status of DTR and RTS in case we aren't setting everything */
if (ioctl(fd, TIOCMGET, &status) < 0) {
return -1;
}
for (i = 0; i < len; i += 2) {
Jim_Obj *nameObj = Jim_ListGetIndex(interp, dictObjPtr, i);
Jim_Obj *valueObj = Jim_ListGetIndex(interp, dictObjPtr, i + 1);
int opt;
long l;
if (Jim_GetEnum(interp, nameObj, modem_signal_names, &opt, "signal", JIM_ERRMSG | JIM_ENUM_ABBREV) != JIM_OK) {
return JIM_ERR;
}
if (Jim_GetLong(interp, valueObj, &l) != JIM_OK) {
Jim_SetResultFormatted(interp, "bad value for %#s: %#s", nameObj, valueObj);
return JIM_ERR;
}
switch (opt) {
case OPT_RTS:
if (l) {
status |= TIOCM_RTS;
}
else {
status &= ~TIOCM_RTS;
}
break;
case OPT_DTR:
if (l) {
status |= TIOCM_DTR;
}
else {
status &= ~TIOCM_DTR;
}
break;
case OPT_BREAK:
tcsendbreak(fd, l);
break;
}
}
if (ioctl(fd, TIOCMSET, &status) < 0) {
return -1;
}
return JIM_OK;
}