/* $Id: gsm.c,v 1.78 2010/05/07 00:40:51 khorben Exp $ */
/* Copyright (c) 2010 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Desktop Phone */
/* 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, version 3 of the License.
 *
 * 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, see <http://www.gnu.org/licenses/>. */



#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <libintl.h>
#include <glib.h>
#include "phone.h"
#include "gsm.h"
#define _(string) gettext(string)
#define N_(string) (string)


/* GSM */
/* private */
/* types */
typedef enum _GSMMode
{
	GSM_MODE_INIT = 0, GSM_MODE_COMMAND, GSM_MODE_PDU
} GSMMode;

typedef enum _GSMPriority
{
	GSM_PRIORITY_LOW = 0, GSM_PRIORITY_NORMAL, GSM_PRIORITY_HIGH,
	GSM_PRIORITY_HIGHEST
} GSMPriority;

typedef enum _GSMQuirk
{
	GSM_QUIRK_NONE = 0,
	GSM_QUIRK_CPIN_QUOTES_NEWLINE,
	GSM_QUIRK_COPS_NEWLINE
} GSMQuirk;

typedef void (*GSMCommandCallback)(GSM * gsm);

typedef struct _GSMCommand
{
	GSMPriority priority;
	char * command;
	char const * suffix;
	GSMError error;
	GSMCommandCallback callback;
	GSMMode mode;
} GSMCommand;

typedef struct _GSMTrigger
{
	char const * trigger;
	size_t trigger_cnt;
	int (*callback)(GSM * gsm, char const * result);
} GSMTrigger;

struct _GSM
{
	/* settings */
	char * device;
	unsigned int baudrate;
	unsigned int retry;
	unsigned int hwflow;
	unsigned int quirks;

	/* callback */
	GSMCallback callback;
	gpointer callback_data;
	GSMEvent event;
	GSMStatus status;

	/* queue */
	GSList * queue;

	/* internal */
	GSMMode mode;
	guint source;
	GIOChannel * channel;
	char * rd_buf;
	size_t rd_buf_cnt;
	guint rd_source;
	char * wr_buf;
	size_t wr_buf_cnt;
	guint wr_source;
};


/* variables */
/* ANSWERS */
static char const * _gsm_errors[] = { "ERROR", "NO CARRIER", NULL };

/* CME ERROR */
static struct
{
	int code;
	char const * error;
} _gsm_cme_errors[] =
{
	{ 0,	N_("Phone failure")				},
	{ 1,	N_("No connection to phone")			},
	{ 3,	N_("Operation not allowed")			},
	{ 4,	N_("Operation not supported")			},
	{ 10,	N_("SIM not inserted")				},
	{ 11,	N_("SIM PIN required")				},
	{ 12,	N_("SIM PUK required")				},
	{ 13,	N_("SIM failure")				},
	{ 14,	N_("SIM busy")					},
	{ 15,	N_("SIM wrong")					},
	{ 16,	N_("Incorrect password")			},
	{ 17,	N_("SIM PIN2 required")				},
	{ 18,	N_("SIM PUK2 required")				},
	{ 20,	N_("Memory full")				},
	{ 21,	N_("Invalid index")				},
	{ 22,	N_("Not found")					},
	{ 23,	N_("Memory failure")				},
	{ 24,	N_("Text string too long")			},
	{ 25,	N_("Invalid characters in text string")		},
	{ 26,	N_("Dial string too long")			},
	{ 27,	N_("Invalid characters in dial string")		},
	{ 30,	N_("No network service")			},
	{ 31,	N_("Network timeout")				},
	{ 32,	N_("Network not allowed - emergency calls only")},
	{ 0,	NULL						}
};

/* CMS ERROR */
static struct
{
	int code;
	char const * error;
} _gsm_cms_errors[] =
{
	{ 300,	N_("ME failure")				},
	{ 301,	N_("SMS service of ME reserved")		},
	{ 302,	N_("Operation not allowed")			},
	{ 303,	N_("Operation not supported")			},
	{ 304,	N_("Invalid PDU mode parameter")		},
	{ 310,	N_("SIM not inserted")				},
	{ 311,	N_("SIM PIN required")				},
	{ 0,	NULL						}
};

/* models */
static struct
{
	char const * model;
	unsigned int quirks;
} _gsm_models[] =
{
	{ "\"Neo1973 GTA02 Embedded GSM Modem\"",
		GSM_QUIRK_CPIN_QUOTES_NEWLINE
		| GSM_QUIRK_COPS_NEWLINE			},
	{ NULL,	0						}
};


/* prototypes */
static int _is_code(char const * code);
static int _is_figure(int c);
static int _is_number(char const * number);

/* commands */
static GSMCommand * _gsm_command_new(char const * command);
static void _gsm_command_delete(GSMCommand * command);
static GSMMode _gsm_command_get_mode(GSMCommand * gsmc);
static GSMPriority _gsm_command_get_priority(GSMCommand * gsmc);
static void _gsm_command_set_callback(GSMCommand * gsmc,
		GSMCommandCallback callback);
static void _gsm_command_set_error(GSMCommand * gsmc, GSMError error);
static void _gsm_command_set_mode(GSMCommand * gsmc, GSMMode mode);
static void _gsm_command_set_priority(GSMCommand * gsmc, GSMPriority priority);
static void _gsm_command_set_suffix(GSMCommand * gsmc, char const * suffix);

/* events */
static int _gsm_event(GSM * gsm, GSMEventType type, ...);
static int _gsm_event_send(GSM * gsm, GSMEventType type);
static int _gsm_event_set_status(GSM * gsm, GSMStatus status);

/* modem commands */
static int _gsm_modem_answer(GSM * gsm);
static int _gsm_modem_call(GSM * gsm, GSMCallType calltype,
		char const * number);
static int _gsm_modem_call_contact(GSM * gsm, GSMCallType calltype,
		unsigned int index);
static int _gsm_modem_call_last(GSM * gsm, GSMCallType calltype);
static int _gsm_modem_enter_sim_pin(GSM * gsm, char const * code);
static int _gsm_modem_get_contact_list(GSM * gsm);
static int _gsm_modem_get_contacts(GSM * gsm, unsigned int start,
		unsigned int end);
static int _gsm_modem_get_message_list(GSM * gsm);
static int _gsm_modem_get_messages(GSM * gsm, unsigned int start,
		unsigned int end);
static int _gsm_modem_get_model(GSM * gsm);
static int _gsm_modem_get_operator(GSM * gsm);
static int _gsm_modem_get_registration(GSM * gsm);
static int _gsm_modem_get_signal_level(GSM * gsm);
static int _gsm_modem_is_pin_needed(GSM * gsm);
static int _gsm_modem_is_registered(GSM * gsm);
static int _gsm_modem_hangup(GSM * gsm);
static int _gsm_modem_send_message(GSM * gsm, char const * number,
		char const * text);
static int _gsm_modem_set_echo(GSM * gsm, gboolean echo);
static int _gsm_modem_set_extended_ring(GSM * gsm, gboolean extended);
static int _gsm_modem_set_functional(GSM * gsm, gboolean functional);
static int _gsm_modem_set_message_format(GSM * gsm, GSMMessageFormat format);
static int _gsm_modem_set_operator_format(GSM * gsm, GSMOperatorFormat format);
static int _gsm_modem_set_operator_mode(GSM * gsm, GSMOperatorMode mode);
static int _gsm_modem_set_registration_report(GSM * gsm,
		GSMRegistrationReport report);
static int _gsm_modem_set_verbose(GSM * gsm, gboolean verbose);

/* parsing */
static int _gsm_parse(GSM * gsm);
static int _gsm_parse_line(GSM * gsm, char const * line, gboolean * answered);

/* queue management */
static GSMCommand * _gsm_queue(GSM * gsm, char const * command);
static int _gsm_queue_with_error(GSM * gsm, char const * command,
		GSMError error);
static int _gsm_queue_full(GSM * gsm, GSMPriority priority,
		char const * command, char const * suffix, GSMError error,
		GSMCommandCallback callback);
static int _gsm_queue_full_mode(GSM * gsm, GSMPriority priority,
		char const * command, char const * suffix, GSMError error,
		GSMCommandCallback callback, GSMMode mode);
static int _gsm_queue_command(GSM * gsm, GSMCommand * command);
static void _gsm_queue_flush(GSM * gsm);
static void _gsm_queue_pop(GSM * gsm);
static int _gsm_queue_push(GSM * gsm);

/* triggers */
static int _gsm_trigger_cgmm(GSM * gsm, char const * result);
static int _gsm_trigger_cme_error(GSM * gsm, char const * result);
static int _gsm_trigger_cms_error(GSM * gsm, char const * result);
static int _gsm_trigger_cmgl(GSM * gsm, char const * result);
static int _gsm_trigger_cmgs(GSM * gsm, char const * result);
static int _gsm_trigger_cops(GSM * gsm, char const * result);
static int _gsm_trigger_cpbr(GSM * gsm, char const * result);
static int _gsm_trigger_cpin(GSM * gsm, char const * result);
static int _gsm_trigger_creg(GSM * gsm, char const * result);
static int _gsm_trigger_cring(GSM * gsm, char const * result);
static int _gsm_trigger_csq(GSM * gsm, char const * result);

/* triggers */
static GSMTrigger _gsm_triggers[] =
{
#define GSM_TRIGGER(trigger, callback) \
	{ trigger, sizeof(trigger) - 1, _gsm_trigger_ ## callback }
	GSM_TRIGGER("+CGMM: ",		cgmm),
	GSM_TRIGGER("+CME ERROR: ",	cme_error),
	GSM_TRIGGER("+CMS ERROR: ",	cms_error),
	GSM_TRIGGER("+CMGL: ",		cmgl),
	GSM_TRIGGER("+CMGS: ",		cmgs),
	GSM_TRIGGER("+COPS: ",		cops),
	GSM_TRIGGER("+CPBR: ",		cpbr),
	GSM_TRIGGER("+CPIN: ",		cpin),
	GSM_TRIGGER("+CREG: ",		creg),
	GSM_TRIGGER("+CRING: ",		cring),
	GSM_TRIGGER("+CSQ: ",		csq),
	{ NULL, 0, NULL }
};

/* callbacks */
static gboolean _on_reset(gpointer data);
static gboolean _on_watch_can_read(GIOChannel * source, GIOCondition condition,
		gpointer data);
static gboolean _on_watch_can_write(GIOChannel * source, GIOCondition condition,
		gpointer data);


/* public */
/* functions */
/* gsm_new */
static unsigned int _new_baudrate(unsigned int baudrate);

GSM * gsm_new(char const * device, unsigned int baudrate, unsigned int hwflow)
{
	GSM * gsm;

	if(device == NULL)
		return NULL;
	if((gsm = malloc(sizeof(*gsm))) == NULL)
		return NULL;
	/* settings */
	gsm->device = strdup(device);
	gsm->baudrate = _new_baudrate(baudrate);
	gsm->retry = 1000;
	gsm->hwflow = hwflow;
	gsm->quirks = 0;
	/* callback */
	gsm->callback = NULL;
	gsm->callback_data = NULL;
	memset(&gsm->event, 0, sizeof(gsm->event));
	gsm->status = GSM_STATUS_UNKNOWN;
	/* queue */
	gsm->queue = NULL;
	/* internal */
	gsm->mode = GSM_MODE_INIT;
	gsm->source = 0;
	gsm->channel = NULL;
	gsm->rd_buf = NULL;
	gsm->rd_buf_cnt = 0;
	gsm->rd_source = 0;
	gsm->wr_buf = NULL;
	gsm->wr_buf_cnt = 0;
	gsm->wr_source = 0;
	/* error checking */
	if(gsm->device == NULL || gsm->baudrate == 0)
	{
		gsm_delete(gsm);
		return NULL;
	}
	gsm_reset(gsm, 0);
	return gsm;
}

static unsigned int _new_baudrate(unsigned int baudrate)
{
	char buf[256];

	switch(baudrate)
	{
		case 1200:
			return B1200;
		case 2400:
			return B2400;
		case 4800:
			return B4800;
		case 9600:
			return B9600;
		case 19200:
			return B19200;
		case 38400:
			return B38400;
#ifdef B76800
		case 76800:
			return B76800;
#endif
#ifdef B14400
		case 14400:
			return B14400;
#endif
#ifdef B28800
		case 28800:
			return B28800;
#endif
		case 57600:
			return B57600;
		case 115200:
			return B115200;
		case 460800:
			return B460800;
		case 921600:
			return B921600;
		default:
			snprintf(buf, sizeof(buf), "%u%s", baudrate,
					_(": Unknown baudrate"));
			return phone_error(NULL, buf, baudrate);
	}
}


/* gsm_delete */
void gsm_delete(GSM * gsm)
{
	if(gsm->rd_source != 0)
		g_source_remove(gsm->rd_source);
	gsm->rd_source = 0;
	_gsm_queue_flush(gsm);
	free(gsm->device);
	free(gsm);
}


/* accessors */
/* gsm_get_retry */
unsigned int gsm_get_retry(GSM * gsm)
{
#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s() => %u\n", __func__, gsm->retry);
#endif
	return gsm->retry;
}


/* gsm_set_callback */
void gsm_set_callback(GSM * gsm, GSMCallback callback, gpointer data)
{
	gsm->callback = callback;
	gsm->callback_data = data;
}


/* gsm_set_functional */
int gsm_set_functional(GSM * gsm, int functional)
{
	return _gsm_modem_set_functional(gsm, (functional != 0) ? TRUE : FALSE);
}


/* gsm_set_operator_format */
int gsm_set_operator_format(GSM * gsm, GSMOperatorFormat format)
{
	return _gsm_modem_set_operator_format(gsm, format);
}


/* gsm_set_operator_mode */
int gsm_set_operator_mode(GSM * gsm, GSMOperatorMode mode)
{
	return _gsm_modem_set_operator_mode(gsm, mode);
}


/* gsm_set_registration_report */
int gsm_set_registration_report(GSM * gsm, GSMRegistrationReport report)
{
	int ret;

	ret = _gsm_modem_set_registration_report(gsm, report);
	ret |= gsm_fetch_registration(gsm);
	return ret;
}


/* gsm_set_retry */
int gsm_set_retry(GSM * gsm, unsigned int retry)
{
#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(%u)\n", __func__, retry);
#endif
	gsm->retry = retry;
	return 0;
}


/* gsm_set_extended_ring */
int gsm_set_extended_ring(GSM * gsm, gboolean extended)
{
	return _gsm_modem_set_extended_ring(gsm, extended);
}


/* useful */
/* gsm_answer */
int gsm_answer(GSM * gsm)
{
	return _gsm_modem_answer(gsm);
}


/* gsm_call */
int gsm_call(GSM * gsm, GSMCallType calltype, char const * number)
{
	if(number == NULL)
		return _gsm_modem_call_last(gsm, calltype);
	/* FIXME if the number is not valid try from the address book */
	return _gsm_modem_call(gsm, calltype, number);
}


/* gsm_call_contact */
int gsm_call_contact(GSM * gsm, GSMCallType calltype, unsigned int index)
{
	return _gsm_modem_call_contact(gsm, calltype, index);
}


/* gsm_enter_sim_pin */
int gsm_enter_sim_pin(GSM * gsm, char const * code)
{
	if(code == NULL)
		return _gsm_modem_is_pin_needed(gsm);
	return _gsm_modem_enter_sim_pin(gsm, code);
}


/* gsm_fetch_contact_list */
int gsm_fetch_contact_list(GSM * gsm)
{
	return _gsm_modem_get_contact_list(gsm);
}


/* gsm_fetch_contacts */
int gsm_fetch_contacts(GSM * gsm, unsigned int start, unsigned int end)
{
	return _gsm_modem_get_contacts(gsm, start, end);
}


/* gsm_fetch_message_list */
int gsm_fetch_message_list(GSM * gsm)
{
	return _gsm_modem_get_message_list(gsm);
}


/* gsm_fetch_messages */
int gsm_fetch_messages(GSM * gsm, unsigned int start, unsigned int end)
{
	return _gsm_modem_get_messages(gsm, start, end);
}


/* gsm_fetch_operator */
int gsm_fetch_operator(GSM * gsm)
{
	return _gsm_modem_get_operator(gsm);
}


/* gsm_fetch_registration */
int gsm_fetch_registration(GSM * gsm)
{
	return _gsm_modem_get_registration(gsm);
}


/* gsm_fetch_signal_level */
int gsm_fetch_signal_level(GSM * gsm)
{
	return _gsm_modem_get_signal_level(gsm);
}


/* gsm_hangup */
int gsm_hangup(GSM * gsm)
{
	return _gsm_modem_hangup(gsm);
}


/* gsm_is_pin_needed */
int gsm_is_pin_needed(GSM * gsm)
{
	return _gsm_modem_is_pin_needed(gsm);
}


/* gsm_is_registered */
int gsm_is_registered(GSM * gsm)
{
	return _gsm_modem_is_registered(gsm);
}


/* gsm_reset */
int gsm_reset(GSM * gsm, unsigned int delay)
{
	_gsm_queue_flush(gsm);
	if(delay > 0)
		gsm->source = g_timeout_add(delay, _on_reset, gsm);
	else
		gsm->source = g_idle_add(_on_reset, gsm);
	return 0;
}


/* gsm_send_message */
int gsm_send_message(GSM * gsm, char const * number, char const * text)
{
	return _gsm_modem_send_message(gsm, number, text);
}


/* private */
/* functions */
/* is_code */
static int _is_code(char const * code)
{
	int c;

	while((c = *(code++)) != '\0')
		if(!isdigit(c))
			return 0;
	return 1;
}


/* is_figure */
static int _is_figure(int c)
{
	if(c >= '0' && c <= '9')
		return 1;
	if(c == '*' || c == '+' || c == '#')
		return 1;
	return 0;
}


/* is_number */
static int _is_number(char const * number)
{
	if(number == NULL || number[0] == '\0')
		return 0;
	while(*number != '\0')
		if(!_is_figure(*(number++)))
			return 0;
	return 1;
}


/* commands */
/* gsm_command_new */
static GSMCommand * _gsm_command_new(char const * command)
{
	GSMCommand * gsmc;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, command);
#endif
	if((gsmc = malloc(sizeof(*gsmc))) == NULL)
		return NULL; /* XXX report error */
	gsmc->priority = GSM_PRIORITY_NORMAL;
	gsmc->command = strdup(command);
	gsmc->suffix = NULL;
	gsmc->error = GSM_ERROR_UNKNOWN;
	gsmc->callback = NULL;
	gsmc->mode = GSM_MODE_COMMAND;
	/* check errors */
	if(gsmc->command == NULL)
	{
		_gsm_command_delete(gsmc);
		return NULL;
	}
	return gsmc;
}


/* gsm_command_delete */
static void _gsm_command_delete(GSMCommand * gsmc)
{
#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
	free(gsmc->command);
	free(gsmc);
}


/* gsm_command_get_mode */
static GSMMode _gsm_command_get_mode(GSMCommand * gsmc)
{
	return gsmc->mode;
}


/* gsm_command_get_priority */
static GSMPriority _gsm_command_get_priority(GSMCommand * gsmc)
{
	return gsmc->priority;
}


/* gsm_command_set_callback */
static void _gsm_command_set_callback(GSMCommand * gsmc,
		GSMCommandCallback callback)
{
	gsmc->callback = callback;
}


/* gsm_command_set_error */
static void _gsm_command_set_error(GSMCommand * gsmc, GSMError error)
{
	gsmc->error = error;
}


/* gsm_command_set_mode */
static void _gsm_command_set_mode(GSMCommand * gsmc, GSMMode mode)
{
	gsmc->mode = mode;
}


/* gsm_command_set_priority */
static void _gsm_command_set_priority(GSMCommand * gsmc, GSMPriority priority)
{
	gsmc->priority = priority;
}


/* gsm_command_set_suffix */
static void _gsm_command_set_suffix(GSMCommand * gsmc, char const * suffix)
{
	gsmc->suffix = suffix;
}


/* events */
/* gsm_event */
static int _gsm_event(GSM * gsm, GSMEventType type, ...)
{
	va_list ap;
	GSMEvent * event = &gsm->event;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(%d)\n", __func__, type);
#endif
	va_start(ap, type);
	switch(type)
	{
		case GSM_EVENT_TYPE_ERROR:
			event->error.error = va_arg(ap, GSMError);
			event->error.message = va_arg(ap, char *);
			break;
		case GSM_EVENT_TYPE_CONTACT:
			event->contact.index = va_arg(ap, unsigned int);
			event->contact.name = va_arg(ap, char *);
			event->contact.number = va_arg(ap, char *);
			break;
		case GSM_EVENT_TYPE_CONTACT_LIST:
			event->contact_list.start = va_arg(ap, unsigned int);
			event->contact_list.end = va_arg(ap, unsigned int);
			break;
		case GSM_EVENT_TYPE_FUNCTIONAL:
			event->functional.functional = va_arg(ap, unsigned int);
			break;
		case GSM_EVENT_TYPE_INCOMING_CALL:
			event->incoming_call.calltype = va_arg(ap,
					unsigned int);
			break;
		case GSM_EVENT_TYPE_MESSAGE_LIST:
			event->message_list.start = va_arg(ap, unsigned int);
			event->message_list.end = va_arg(ap, unsigned int);
			break;
		case GSM_EVENT_TYPE_MESSAGE_SENT:
			event->message_sent.mr = va_arg(ap, unsigned int);
			break;
		case GSM_EVENT_TYPE_OPERATOR:
			event->operator.mode = va_arg(ap, GSMOperatorMode);
			event->operator.format = va_arg(ap, GSMOperatorFormat);
			event->operator.operator = va_arg(ap, char *);
			event->operator.lai = va_arg(ap, unsigned int);
			break;
		case GSM_EVENT_TYPE_REGISTRATION:
			event->registration.n = va_arg(ap, unsigned int);
			event->registration.stat = va_arg(ap, unsigned int);
			event->registration.area = va_arg(ap, unsigned int);
			event->registration.cell = va_arg(ap, unsigned int);
			break;
		case GSM_EVENT_TYPE_SIGNAL_LEVEL:
			event->signal_level.level = va_arg(ap, gdouble);
			break;
		case GSM_EVENT_TYPE_SIM_PIN_VALID:
			break;
		case GSM_EVENT_TYPE_STATUS:
			event->status.status = va_arg(ap, GSMStatus);
			break;
	}
	va_end(ap);
	return _gsm_event_send(gsm, type);
}


/* gsm_event_send */
static int _gsm_event_send(GSM * gsm, GSMEventType type)
{
	int ret;
	char buf[80];

	gsm->event.type = type;
	ret = gsm->callback(&gsm->event, gsm->callback_data);
	if(ret == 0)
		return 0;
	snprintf(buf, sizeof(buf), "%u: %s", type, _("Event not handled"));
	return phone_error(NULL, buf, ret);
}


/* gsm_event_set_status */
static int _gsm_event_set_status(GSM * gsm, GSMStatus status)
{
	if(gsm->status == status)
		return 0;
	gsm->status = status;
	return _gsm_event(gsm, GSM_EVENT_TYPE_STATUS, status);
}


/* modem commands */
/* gsm_modem_answer */
static int _gsm_modem_answer(GSM * gsm)
{
	char const cmd[] = "ATA";

	return _gsm_queue_with_error(gsm, cmd, GSM_ERROR_ANSWER_FAILED);
}


/* gsm_modem_call */
static int _gsm_modem_call(GSM * gsm, GSMCallType calltype, char const * number)
{
	int ret;
	char const cmd[] = "ATD";
	char const * suffix = "";
	size_t len;
	char * buf;

	switch(calltype)
	{
		case GSM_CALL_TYPE_DATA:
			break;
		case GSM_CALL_TYPE_VOICE:
			suffix = ";";
			break;
		default:
			return 1;
	}
	if(!_is_number(number))
		return 1;
	len = sizeof(cmd) + strlen(number) + strlen(suffix);
	if((buf = malloc(len)) == NULL)
		return 1;
	snprintf(buf, len, "%s%s%s", cmd, number, suffix);
	ret = _gsm_queue_full(gsm, GSM_PRIORITY_HIGH, buf, NULL,
			GSM_ERROR_CALL_FAILED, NULL);
	free(buf);
	return ret;
}


/* gsm_modem_call_contact */
static int _gsm_modem_call_contact(GSM * gsm, GSMCallType calltype,
		unsigned int index)
{
	char const cmd[] = "ATD>";
	char const * suffix = "";
	char buf[32];

	switch(calltype)
	{
		case GSM_CALL_TYPE_DATA:
			break;
		case GSM_CALL_TYPE_VOICE:
			suffix = ";";
			break;
		default:
			return 1;
	}
	snprintf(buf, sizeof(buf), "%s%u%s", cmd, index, suffix);
	return _gsm_queue_full(gsm, GSM_PRIORITY_HIGH, buf, NULL,
			GSM_ERROR_CALL_FAILED, NULL);
}


/* gsm_modem_call_last */
static int _gsm_modem_call_last(GSM * gsm, GSMCallType calltype)
{
	char const cmddata[] = "ATDL";
	char const cmdvoice[] = "ATDL;";
	char const * cmd;

	switch(calltype)
	{
		case GSM_CALL_TYPE_DATA:
			cmd = cmddata;
			break;
		case GSM_CALL_TYPE_VOICE:
			cmd = cmdvoice;
			break;
		default:
			return 1;
	}
	return _gsm_queue_full(gsm, GSM_PRIORITY_HIGH, cmd, NULL,
			GSM_ERROR_CALL_FAILED, NULL);
}


/* gsm_modem_enter_sim_pin */
static void _modem_enter_sim_pin_callback(GSM * gsm);

static int _gsm_modem_enter_sim_pin(GSM * gsm, char const * code)
{
	int ret;
	char const cmd[] = "AT+CPIN=";
	char const * suffix = NULL;
	size_t len;
	char * buf;

	if(!_is_code(code))
	{
		_gsm_event(gsm, GSM_EVENT_TYPE_ERROR, GSM_ERROR_SIM_PIN_WRONG);
		return 1;
	}
	len = sizeof(cmd) + 1 + strlen(code) + 1;
	if((buf = malloc(len)) == NULL)
		return 1;
	if(gsm->quirks & GSM_QUIRK_CPIN_QUOTES_NEWLINE)
	{
		snprintf(buf, len, "%s\"%s\"", cmd, code);
		suffix = "\n";
	}
	else
		snprintf(buf, len, "%s%s", cmd, code);
	ret = _gsm_queue_full(gsm, GSM_PRIORITY_NORMAL, buf, suffix,
			GSM_ERROR_SIM_PIN_WRONG, _modem_enter_sim_pin_callback);
	free(buf);
	return ret;
}

static void _modem_enter_sim_pin_callback(GSM * gsm)
{
	_gsm_event_send(gsm, GSM_EVENT_TYPE_SIM_PIN_VALID);
	/* do we need another PIN code? */
	_gsm_modem_is_pin_needed(gsm);
}


/* gsm_modem_get_contact_list */
static int _gsm_modem_get_contact_list(GSM * gsm)
{
	char const cmd[] = "AT+CPBR=?";

	return _gsm_queue_with_error(gsm, cmd, GSM_ERROR_CONTACT_LIST_FAILED);
}


/* gsm_modem_get_contacts */
static int _gsm_modem_get_contacts(GSM * gsm, unsigned int start,
		unsigned int end)
{
	char cmd[32];
	
	snprintf(cmd, sizeof(cmd), "%s%u,%u", "AT+CPBR=", start, end);
	return _gsm_queue_full(gsm, GSM_PRIORITY_LOW, cmd, NULL,
			GSM_ERROR_CONTACT_FETCH_FAILED, NULL);
}


/* gsm_modem_get_message_list */
static int _gsm_modem_get_message_list(GSM * gsm)
{
	char const cmd[] = "AT+CMGL=?";

	return _gsm_queue_with_error(gsm, cmd, GSM_ERROR_MESSAGE_LIST_FAILED);
}


/* gsm_modem_get_messages */
static int _gsm_modem_get_messages(GSM * gsm, unsigned int start,
		unsigned int end)
{
	char cmd[32];
	
	snprintf(cmd, sizeof(cmd), "%s%u,%u", "AT+CMGR=", start, end);
	return _gsm_queue_full(gsm, GSM_PRIORITY_LOW, cmd, NULL,
			GSM_ERROR_MESSAGE_FETCH_FAILED, NULL);
}


/* gsm_modem_get_model */
static int _gsm_modem_get_model(GSM * gsm)
{
	char const cmd[] = "AT+CGMM";

	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_get_operator */
static int _gsm_modem_get_operator(GSM * gsm)
{
	char const cmd[] = "AT+COPS?";

	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_get_registration */
static int _gsm_modem_get_registration(GSM * gsm)
{
	char const cmd[] = "AT+CREG?";

	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_get_signal_level */
static int _gsm_modem_get_signal_level(GSM * gsm)
{
	char const cmd[] = "AT+CSQ";

	return _gsm_queue_with_error(gsm, cmd, GSM_ERROR_SIGNAL_LEVEL_FAILED);
}


/* gsm_modem_hangup */
static int _gsm_modem_hangup(GSM * gsm)
{
	char const cmd[] = "ATH";

	/* XXX probably should query the call status after that */
	return _gsm_queue_full(gsm, GSM_PRIORITY_HIGH, cmd, NULL,
			GSM_ERROR_HANGUP_FAILED, NULL);
}


/* gsm_modem_is_pin_needed */
static int _gsm_modem_is_pin_needed(GSM * gsm)
{
	char const cmd[] = "AT+CPIN?";

	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_is_registered */
static int _gsm_modem_is_registered(GSM * gsm)
{
	char const cmd[] = "AT+CREG?";

	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_reset */
static int _gsm_modem_reset(GSM * gsm)
{
	char const cmd[] = "ATZ";

	return _gsm_queue_full(gsm, GSM_PRIORITY_HIGH, cmd, NULL,
			GSM_ERROR_RESET_FAILED, NULL);
}


/* gsm_modem_send_message */
static char * _number_to_address(char const * number);
static char * _text_to_sept(char const * text);

static int _gsm_modem_send_message(GSM * gsm, char const * number,
		char const * text)
{
	int ret = 1;
	char const cmd1[] = "AT+CMGS=";
	char * buf1;
	size_t len1;
	char const cmd2[] = "1100";
	char * buf2;
	size_t len2;
	char * addr;
	char * sept;
	char const pid[] = "00";
	char const dcs[] = "00";
	char const vp[] = "AA";
	GSMCommand * gsmc;

	if(!_is_number(number) || text == NULL
			|| _gsm_modem_set_message_format(gsm,
				GSM_MESSAGE_FORMAT_PDU) != 0)
		return _gsm_event(gsm, GSM_EVENT_TYPE_ERROR,
				GSM_ERROR_MESSAGE_SEND_FAILED, NULL);
	addr = _number_to_address(number);
	sept = _text_to_sept(text);
	len2 = sizeof(cmd2) + 2 + strlen(addr ? addr : "") + sizeof(pid)
		+ sizeof(dcs) + 2 + strlen(sept ? sept : "") + 1;
	buf2 = malloc(len2);
	len1 = sizeof(cmd1) + 2;
	buf1 = malloc(len1);
	if(addr == NULL || sept == NULL || buf1 == NULL || buf2 == NULL)
	{
		free(addr);
		free(sept);
		free(buf1);
		free(buf2);
		return _gsm_event(gsm, GSM_EVENT_TYPE_ERROR,
				GSM_ERROR_MESSAGE_SEND_FAILED, NULL);
	}
	snprintf(buf2, len2, "%s%02lX%s%s%s%s%02lX%s\x1a", cmd2,
			number[0] == '+' ? strlen(number) - 1 : strlen(number),
			addr, pid, dcs, vp, strlen(text), sept);
	snprintf(buf1, len1, "%s%lu", cmd1, (len2 - 1) / 2);
	free(addr);
	free(sept);
	if((gsmc = _gsm_command_new(buf1)) != NULL
			&& (ret = _gsm_queue_command(gsm, gsmc)) == 0)
	{
		_gsm_command_set_error(gsmc, GSM_ERROR_MESSAGE_SEND_FAILED);
		_gsm_command_set_mode(gsmc, GSM_MODE_PDU);
		_gsm_command_set_priority(gsmc, GSM_PRIORITY_HIGHEST);
		if((gsmc = _gsm_command_new(buf2)) != NULL
				/* XXX if this fails we're stuck in PDU mode */
				&& (ret = _gsm_queue_command(gsm, gsmc)) == 0)
		{
			_gsm_command_set_error(gsmc,
					GSM_ERROR_MESSAGE_SEND_FAILED);
			_gsm_command_set_priority(gsmc, GSM_PRIORITY_HIGHEST);
		}
	}
	if(ret != 0)
		_gsm_command_delete(gsmc);
	free(buf1);
	free(buf2);
	return ret;
}

static char * _number_to_address(char const * number)
{
	char * buf;
	size_t len;
	size_t i;

	len = 2 + strlen(number) + 2;
	if((buf = malloc(len)) == NULL)
		return NULL;
	snprintf(buf, len, "%02X", (number[0] == '+') ? 145 : 129);
	if(number[0] == '+')
		number++;
	for(i = 2; i < len; i+=2)
	{
		if(number[i - 2] == '\0')
			break;
		buf[i] = number[i - 1];
		buf[i + 1] = number[i - 2];
		if(number[i - 1] == '\0')
		{
			buf[i] = 'F';
			i += 2;
			break;
		}
	}
	buf[i] = '\0';
	return buf;
}

/* this function is heavily inspired from gsmd, (c) 2007 OpenMoko, Inc. */
static char * _text_to_sept(char const * text)
{
	char const tab[] = "0123456789ABCDEF";
	unsigned char const * t = (unsigned char const *)text;
	char * buf;
	size_t len;
	char * p;
	size_t i;
	unsigned char ch1;
	unsigned char ch2;
	int shift = 0;

	len = strlen(text);
	if((buf = malloc(len + 1)) == NULL)
		return NULL;
	p = buf;
	for(i = 0; i < len; i++)
	{
		ch1 = t[i] & 0x7f;
		ch1 = (ch1 >> shift);
		ch2 = t[i + 1] & 0x7f;
		ch2 = ch2 << (7 - shift);
		ch1 = ch1 | ch2;
		*(p++) = tab[(ch1 & 0xf0) >> 4];
		*(p++) = tab[ch1 & 0x0f];
		if(++shift == 7)
		{
			shift = 0;
			i++;
		}
	}
	*p = '\0';
	return buf;
}


/* gsm_modem_set_echo */
static int _gsm_modem_set_echo(GSM * gsm, gboolean echo)
{
	char cmd[] = "ATEX";

	cmd[3] = echo ? '1' : '0';
	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_set_extended_ring */
static int _gsm_modem_set_extended_ring(GSM * gsm, gboolean extended)
{
	char cmd[] = "AT+CRC=X";

	cmd[7] = extended ? '1' : '0';
	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_set_functional */
static int _gsm_modem_set_functional(GSM * gsm, gboolean functional)
{
	char cmd[] = "AT+CFUN=X";

	cmd[8] = functional ? '1' : '0';
	return _gsm_queue_with_error(gsm, cmd, GSM_ERROR_FUNCTIONAL_FAILED);
}


/* gsm_modem_set_message_format */
static int _gsm_modem_set_message_format(GSM * gsm, GSMMessageFormat format)
{
	char cmd[] = "AT+CMGF=X";

	switch(format)
	{
		case GSM_MESSAGE_FORMAT_PDU:
		case GSM_MESSAGE_FORMAT_TEXT:
			break;
		default:
			return 1;
	}
	cmd[8] = format + '0';
	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_set_operator_format */
static int _gsm_modem_set_operator_format(GSM * gsm, GSMOperatorFormat format)
{
	char cmd[] = "AT+COPS=X,X";

	switch(format)
	{
		case GSM_OPERATOR_FORMAT_LONG:
		case GSM_OPERATOR_FORMAT_SHORT:
		case GSM_OPERATOR_FORMAT_LAI:
			break;
		default:
			return 1;
	}
	cmd[8] = GSM_OPERATOR_MODE_SET_FORMAT + '0';
	cmd[10] = format + '0';
	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_set_operator_mode */
static int _gsm_modem_set_operator_mode(GSM * gsm, GSMOperatorMode mode)
{
	char cmd[] = "AT+COPS=X";
	GSMCommand * gsmc;

	switch(mode)
	{
		case GSM_OPERATOR_MODE_AUTOMATIC:
		case GSM_OPERATOR_MODE_MANUAL:
		case GSM_OPERATOR_MODE_DEREGISTER:
			break;
		case GSM_OPERATOR_MODE_MANUAL_WITH_FALLBACK:
			/* FIXME implement this one too */
		default:
			return 1;
	}
	cmd[8] = mode + '0';
	if((gsmc = _gsm_queue(gsm, cmd)) == NULL)
		return 1;
	if(gsm->quirks & GSM_QUIRK_COPS_NEWLINE)
		_gsm_command_set_suffix(gsmc, "\n");
	return 0;
}


/* gsm_modem_set_registration_report */
static int _gsm_modem_set_registration_report(GSM * gsm,
		GSMRegistrationReport report)
{
	char cmd[] = "AT+CREG=X";

	switch(report)
	{
		case GSM_REGISTRATION_REPORT_DISABLE_UNSOLLICITED:
		case GSM_REGISTRATION_REPORT_ENABLE_UNSOLLICITED:
		case GSM_REGISTRATION_REPORT_ENABLE_UNSOLLICITED_WITH_LOCATION:
			break;
		default:
			return 1;
	}
	cmd[8] = report + '0';
	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_modem_set_verbose */
static int _gsm_modem_set_verbose(GSM * gsm, gboolean verbose)
{
	char cmd[] = "ATVX";

	cmd[3] = verbose ? '1' : '0';
	return (_gsm_queue(gsm, cmd) != NULL) ? 0 : 1;
}


/* gsm_parse */
static int _parse_pdu(GSM * gsm);
static int _parse_do(GSM * gsm);

static int _gsm_parse(GSM * gsm)
{
	int ret = 0;
	size_t i = 0;
	char * p;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s() cnt=%lu\n", __func__, gsm->rd_buf_cnt);
#endif
	while(i < gsm->rd_buf_cnt)
	{
		if(gsm->rd_buf[i++] != '\r' && gsm->rd_buf[i - 1] != '\n')
			continue;
		gsm->rd_buf[i - 1] = '\0';
		if(i < gsm->rd_buf_cnt && gsm->rd_buf[i] == '\n')
			i++;
		if(gsm->rd_buf[0] != '\0')
			ret |= _parse_do(gsm);
		gsm->rd_buf_cnt -= i;
		memmove(gsm->rd_buf, &gsm->rd_buf[i], gsm->rd_buf_cnt);
		if((p = realloc(gsm->rd_buf, gsm->rd_buf_cnt)) != NULL)
			gsm->rd_buf = p; /* we can ignore errors... */
		else if(gsm->rd_buf_cnt == 0)
			gsm->rd_buf = NULL; /* ...except when it's not one */
		i = 0;
	}
	if(gsm->mode == GSM_MODE_PDU)
		return _parse_pdu(gsm);
	return ret;
}

static int _parse_pdu(GSM * gsm)
{
	size_t i = 0;
	char * p;

	if(gsm->rd_buf_cnt < 2)
		return 0;
	if(gsm->rd_buf[i++] == '>' && gsm->rd_buf[i++] == ' ')
	{
		_gsm_queue_pop(gsm);
		_gsm_queue_push(gsm);
	}
	gsm->rd_buf_cnt -= i;
	memmove(gsm->rd_buf, &gsm->rd_buf[i], gsm->rd_buf_cnt);
	if((p = realloc(gsm->rd_buf, gsm->rd_buf_cnt)) != NULL)
		gsm->rd_buf = p; /* we can ignore errors... */
	else if(gsm->rd_buf_cnt == 0)
		gsm->rd_buf = NULL; /* ...except when it's not one */
	return 0;
}

static int _parse_do(GSM * gsm)
{
	gboolean answered = FALSE;

	if(gsm->mode == GSM_MODE_INIT)
	{
		if(strcmp(gsm->rd_buf, "OK") != 0)
			return 0;
		g_source_remove(gsm->source);
		gsm->source = 0;
		gsm->mode = GSM_MODE_COMMAND;
		_gsm_modem_set_echo(gsm, FALSE);
		_gsm_modem_set_verbose(gsm, TRUE);
		_gsm_modem_set_extended_ring(gsm, TRUE);
		_gsm_modem_get_model(gsm);
		_gsm_event_set_status(gsm, GSM_STATUS_INITIALIZED);
		_gsm_queue_push(gsm);
	}
	else if(gsm->mode == GSM_MODE_COMMAND)
	{
		_gsm_parse_line(gsm, gsm->rd_buf, &answered);
		if(answered)
		{
			_gsm_queue_pop(gsm);
			_gsm_queue_push(gsm);
		}
	}
	return 0;
}


/* gsm_parse_line */
static int _gsm_parse_line(GSM * gsm, char const * line, gboolean * answered)
{
	size_t i;
	GSMCommand * command;
	GSMError error = GSM_ERROR_UNKNOWN;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, line);
#endif
	if(answered != NULL)
		*answered = FALSE;
	if(strncmp(line, "AT", 2) == 0) /* ignore echo (tighter check?) */
		return 0;
	if(strcmp(line, "RING") == 0)
	{
		_gsm_event(gsm, GSM_EVENT_TYPE_INCOMING_CALL,
				GSM_CALL_TYPE_UNKNOWN);
		return 0;
	}
	if(strcmp(line, "OK") == 0)
	{
		if(answered != NULL)
			*answered = TRUE;
		if((command = g_slist_nth_data(gsm->queue, 0)) != NULL
				&& command->callback != NULL)
			command->callback(gsm);
		return 0;
	}
	for(i = 0; _gsm_errors[i] != NULL; i++)
	{
		if(strcmp(_gsm_errors[i], line) != 0)
			continue;
		if(answered != NULL)
			*answered = TRUE;
		if((command = g_slist_nth_data(gsm->queue, 0)) != NULL)
			error = command->error;
		_gsm_event(gsm, GSM_EVENT_TYPE_ERROR, error, line);
		return 0;
	}
	for(i = 0; _gsm_triggers[i].trigger != NULL; i++)
		if(strncmp(line, _gsm_triggers[i].trigger,
					_gsm_triggers[i].trigger_cnt) == 0)
			return _gsm_triggers[i].callback(gsm,
					&line[_gsm_triggers[i].trigger_cnt]);
	/* XXX not handled... */
	return 1;
}


/* queue management */
/* gsm_queue */
static GSMCommand * _gsm_queue(GSM * gsm, char const * command)
{
	GSMCommand * gsmc;

	if(command == NULL || command[0] == '\0')
		return NULL;
	if((gsmc = _gsm_command_new(command)) == NULL)
		return NULL;
	if(_gsm_queue_command(gsm, gsmc) == 0)
		return gsmc;
	_gsm_command_delete(gsmc);
	return NULL;
}


/* gsm_queue_command */
static int _gsm_queue_command(GSM * gsm, GSMCommand * command)
{
	GSMPriority priority;
	GSList * l;
	GSMCommand * p;

	if(command == NULL)
		return 1;
	/* the GSM_PRIORITY_HIGHEST priority is meant to avoid races */
	if((priority = _gsm_command_get_priority(command)) > GSM_PRIORITY_HIGH)
		priority = GSM_PRIORITY_HIGH;
	for(l = gsm->queue; l != NULL; l = l->next)
	{
		p = l->data;
		if(_gsm_command_get_priority(p) < priority)
			break;
	}
	if(l != NULL)
		gsm->queue = g_slist_insert_before(gsm->queue, l, command);
	else if(gsm->queue == NULL && gsm->mode == GSM_MODE_COMMAND)
	{
		gsm->queue = g_slist_append(gsm->queue, command);
		_gsm_queue_push(gsm);
	}
	else if(gsm->mode == GSM_MODE_INIT && gsm->wr_source == 0)
	{
		gsm->queue = g_slist_append(gsm->queue, command);
		_gsm_queue_push(gsm);
	}
	else
		gsm->queue = g_slist_append(gsm->queue, command);
	return 0;
}


/* gsm_queue_error */
static int _gsm_queue_with_error(GSM * gsm, char const * command,
		GSMError error)
{
	GSMCommand * gsmc;

	if((gsmc = _gsm_queue(gsm, command)) == NULL)
		return 1;
	_gsm_command_set_error(gsmc, error);
	return 0;
}


/* _gsm_queue_flush */
static void _gsm_queue_flush(GSM * gsm)
{
#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
	g_slist_foreach(gsm->queue, (GFunc)_gsm_command_delete, NULL);
	g_slist_free(gsm->queue);
	gsm->queue = NULL;
	free(gsm->rd_buf);
	gsm->rd_buf = NULL;
	gsm->rd_buf_cnt = 0;
	if(gsm->rd_source != 0)
	{
		g_source_remove(gsm->rd_source);
		gsm->rd_source = 0;
	}
	free(gsm->wr_buf);
	gsm->wr_buf = NULL;
	gsm->wr_buf_cnt = 0;
	if(gsm->wr_source != 0)
	{
		g_source_remove(gsm->wr_source);
		gsm->wr_source = 0;
	}
	if(gsm->source != 0)
	{
		g_source_remove(gsm->source);
		gsm->source = 0;
	}
}


/* gsm_queue_full */
static int _gsm_queue_full(GSM * gsm, GSMPriority priority,
		char const * command, char const * suffix, GSMError error,
		GSMCommandCallback callback)
{
	return _gsm_queue_full_mode(gsm, priority, command, suffix, error,
			callback, GSM_MODE_COMMAND);
}


/* gsm_queue_full_mode */
static int _gsm_queue_full_mode(GSM * gsm, GSMPriority priority,
		char const * command, char const * suffix, GSMError error,
		GSMCommandCallback callback, GSMMode mode)
{
	GSMCommand * gsmc;

	if(command == NULL || command[0] == '\0')
		return 1;
	if((gsmc = _gsm_command_new(command)) == NULL)
		return 1;
	_gsm_command_set_priority(gsmc, priority);
	_gsm_command_set_suffix(gsmc, suffix);
	_gsm_command_set_error(gsmc, error);
	_gsm_command_set_callback(gsmc, callback);
	_gsm_command_set_mode(gsmc, mode);
	if(_gsm_queue_command(gsm, gsmc) == 0)
		return 0;
	_gsm_command_delete(gsmc);
	return 1;
}


/* gsm_queue_pop */
static void _gsm_queue_pop(GSM * gsm)
{
	GSMCommand * gsmc;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
	if(gsm->queue == NULL)
		return;
	gsmc = gsm->queue->data;
	_gsm_command_delete(gsmc);
	gsm->queue = g_slist_remove(gsm->queue, gsmc);
#if 0 /* FIXME this is useless */
	if(gsm->mode != GSM_MODE_COMMAND)
		return;
#endif
}


/* gsm_queue_push */
static int _gsm_queue_push(GSM * gsm)
{
	GSMCommand * gsmc;
	char const * suffix;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
	if(gsm->queue == NULL)
		return 0;
	gsmc = gsm->queue->data;
	suffix = (gsmc->suffix != NULL) ? gsmc->suffix : "\r\n";
	gsm->wr_buf_cnt = strlen(gsmc->command) + strlen(suffix);
	if((gsm->wr_buf = malloc(gsm->wr_buf_cnt + 1)) == NULL)
		return 1;
	snprintf(gsm->wr_buf, gsm->wr_buf_cnt + 1, "%s%s", gsmc->command,
			suffix);
	/* FIXME shouldn't it always be the case? flush input queue first? */
	if(gsm->channel != NULL && gsm->wr_source == 0)
		gsm->wr_source = g_io_add_watch(gsm->channel, G_IO_OUT,
				_on_watch_can_write, gsm);
	return 0;
}


/* triggers */
/* gsm_trigger_cgmm */
static int _gsm_trigger_cgmm(GSM * gsm, char const * result)
{
	size_t i;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	for(i = 0; _gsm_models[i].model != NULL; i++)
		if(strcmp(_gsm_models[i].model, result) == 0)
			break;
	if(_gsm_models[i].model == NULL)
		return 1; /* we do not know this model */
	gsm->quirks = _gsm_models[i].quirks;
	return 0;
}


/* gsm_trigger_cme_error */
static int _gsm_trigger_cme_error(GSM * gsm, char const * result)
{
	int code;
	char * p;
	size_t i;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	code = strtol(result, &p, 10);
	if(result[0] == '\0' || *p != '\0')
		return 1;
	for(i = 0; _gsm_cme_errors[i].error != NULL; i++)
		if(_gsm_cme_errors[i].code == code)
			break;
	if(_gsm_cme_errors[i].error == NULL)
		return 1;
	/* FIXME implement errors */
	return _gsm_event(gsm, GSM_EVENT_TYPE_ERROR, GSM_ERROR_UNKNOWN,
			_(_gsm_cme_errors[i].error));
}


/* gsm_trigger_cms_error */
static int _gsm_trigger_cms_error(GSM * gsm, char const * result)
{
	int code;
	char * p;
	size_t i;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	code = strtol(result, &p, 10);
	if(result[0] == '\0' || *p != '\0')
		return 1;
	for(i = 0; _gsm_cms_errors[i].error != NULL; i++)
		if(_gsm_cms_errors[i].code == code)
			break;
	if(_gsm_cms_errors[i].error == NULL)
		return 1;
	/* FIXME implement errors */
	return _gsm_event(gsm, GSM_EVENT_TYPE_ERROR, GSM_ERROR_UNKNOWN,
			_(_gsm_cms_errors[i].error));
}


/* gsm_trigger_cmgl */
static int _gsm_trigger_cmgl(GSM * gsm, char const * result)
{
#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	if(sscanf(result, "(%u-%u)", &gsm->event.message_list.start,
				&gsm->event.message_list.end) != 2)
		return 1;
	return _gsm_event_send(gsm, GSM_EVENT_TYPE_MESSAGE_LIST);
}


/* gsm_trigger_cmgs */
static int _gsm_trigger_cmgs(GSM * gsm, char const * result)
{
#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	if(sscanf(result, "%u", &gsm->event.message_sent.mr) != 1)
		return 1;
	return _gsm_event_send(gsm, GSM_EVENT_TYPE_MESSAGE_SENT);
}


/* gsm_trigger_cops */
static int _gsm_trigger_cops(GSM * gsm, char const * result)
{
	char operator[32];

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	gsm->event.operator.operator = operator;
	gsm->event.operator.lai = 0;
	if(sscanf(result, "%u,%u,\"%31[^\"]\",%u", &gsm->event.operator.mode,
				&gsm->event.operator.format, operator,
				&gsm->event.operator.lai) >= 3)
		return _gsm_event_send(gsm, GSM_EVENT_TYPE_OPERATOR);
	return 1;
}


/* _gsm_trigger_cpbr */
static int _gsm_trigger_cpbr(GSM * gsm, char const * result)
{
	unsigned int start;
	unsigned int end;
	unsigned int index;
	char number[32];
	char name[32];
	gchar * p;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	if(sscanf(result, "(%u-%u)", &start, &end) == 2)
		return _gsm_event(gsm, GSM_EVENT_TYPE_CONTACT_LIST, start, end);
	if(sscanf(result, "%u,\"%31[^\"]\",145,\"%31[^\"]\"", &index, number,
				name) != 3
			&& sscanf(result, "%u,\"%31[^\"]\",129,\"%31[^\"]\"",
				&index, number, name) != 3)
		return 1;
	number[sizeof(number) - 1] = '\0';
	name[sizeof(name) - 1] = '\0';
	if((p = g_convert(name, -1, "UTF-8", "ISO-8859-1", NULL, NULL, NULL))
			!= NULL)
	{
		snprintf(name, sizeof(name), "%s", p);
		g_free(p);
	}
	return _gsm_event(gsm, GSM_EVENT_TYPE_CONTACT, index, name,
			number);
}


/* _gsm_trigger_cpin */
static int _gsm_trigger_cpin(GSM * gsm, char const * result)
{
#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	if(strcmp(result, "READY") == 0)
		return _gsm_event_set_status(gsm, GSM_STATUS_READY);
	if(strcmp(result, "SIM PIN") == 0)
		return _gsm_event(gsm, GSM_EVENT_TYPE_ERROR,
				GSM_ERROR_SIM_PIN_REQUIRED, NULL);
	else
		/* XXX nicer message */
		return _gsm_event(gsm, GSM_EVENT_TYPE_ERROR, result);
}


/* gsm_trigger_creg */
static int _gsm_trigger_creg(GSM * gsm, char const * result)
{
	int ret;
	int res;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	if((res = sscanf(result, "%u,%u,%X,%X", &gsm->event.registration.n,
					&gsm->event.registration.stat,
					&gsm->event.registration.area,
					&gsm->event.registration.cell)) == 4)
		ret = _gsm_event_send(gsm, GSM_EVENT_TYPE_REGISTRATION);
	else if(res == 2)
	{
		gsm->event.registration.area = 0;
		gsm->event.registration.cell = 0;
		ret = _gsm_event_send(gsm, GSM_EVENT_TYPE_REGISTRATION);
	}
	else
		return 1;
	switch(gsm->event.registration.stat)
	{
		case GSM_REGISTRATION_STATUS_NOT_SEARCHING:
			ret |= _gsm_event_set_status(gsm, GSM_STATUS_READY);
			break;
		case GSM_REGISTRATION_STATUS_NOT_REGISTERED:
			ret |= _gsm_event_set_status(gsm,
					GSM_STATUS_REGISTERING);
			break;
		case GSM_REGISTRATION_STATUS_DENIED:
			ret |= _gsm_event_set_status(gsm,
					GSM_STATUS_REGISTERING_DENIED);
			break;
		case GSM_REGISTRATION_STATUS_REGISTERED_HOME:
			ret |= _gsm_event_set_status(gsm,
					GSM_STATUS_REGISTERED_HOME);
			break;
		case GSM_REGISTRATION_STATUS_REGISTERED_ROAMING:
			ret |= _gsm_event_set_status(gsm,
					GSM_STATUS_REGISTERED_ROAMING);
			break;
		case GSM_REGISTRATION_STATUS_UNKNOWN:
		default:
			ret |= _gsm_event_set_status(gsm, GSM_STATUS_UNKNOWN);
			break;
	}
	return ret;
}


/* gsm_trigger_cring */
static int _gsm_trigger_cring(GSM * gsm, char const * result)
{
	GSMCallType calltype = GSM_CALL_TYPE_UNKNOWN;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	/* XXX implement the other call types */
	if(strcmp(result, "VOICE") == 0)
		calltype = GSM_CALL_TYPE_VOICE;
	return _gsm_event(gsm, GSM_EVENT_TYPE_INCOMING_CALL, calltype);
}


/* _gsm_trigger_csq */
static int _gsm_trigger_csq(GSM * gsm, char const * result)
{
	unsigned int rssi;
	unsigned int ber;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, result);
#endif
	if(sscanf(result, "%u,%u", &rssi, &ber) != 2)
		return 1;
	gsm->event.signal_level.level = rssi;
	if(rssi > 31)
		gsm->event.signal_level.level /= 0.0;
	else
		gsm->event.signal_level.level /= 32;
	return _gsm_event_send(gsm, GSM_EVENT_TYPE_SIGNAL_LEVEL);
}


/* callbacks */
/* on_reset */
static int _reset_do(int fd, unsigned int baudrate, unsigned int hwflow);
static gboolean _reset_settle(gpointer data);

static gboolean _on_reset(gpointer data)
{
	GSM * gsm = data;
	int fd;
	char buf[256];
	GError * error = NULL;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
	gsm->source = 0;
	if(gsm->channel != NULL)
	{
		/* XXX should the file descriptor also be freed? */
		g_io_channel_shutdown(gsm->channel, TRUE, &error);
		g_io_channel_unref(gsm->channel);
		gsm->channel = NULL;
	}
	if((fd = open(gsm->device, O_RDWR | O_NONBLOCK)) < 0
			|| _reset_do(fd, gsm->baudrate, gsm->hwflow) != 0)
	{
		snprintf(buf, sizeof(buf), "%s%s%s", gsm->device, ": ",
				strerror(errno));
		if(fd >= 0)
			close(fd);
		if(gsm->retry > 0)
			gsm->source = g_timeout_add(gsm->retry, _on_reset, gsm);
		return phone_error(NULL, buf, FALSE);
	}
	gsm->channel = g_io_channel_unix_new(fd);
	if((g_io_channel_set_encoding(gsm->channel, NULL, &error))
			!= G_IO_STATUS_NORMAL)
		phone_error(NULL, error->message, 0);
	g_io_channel_set_buffered(gsm->channel, FALSE);
	gsm->rd_source = g_io_add_watch(gsm->channel, G_IO_IN,
			_on_watch_can_read, gsm);
	if(gsm->wr_buf_cnt > 0)
		gsm->wr_source = g_io_add_watch(gsm->channel, G_IO_OUT,
				_on_watch_can_write, gsm);
	gsm->source = g_timeout_add(500, _reset_settle, gsm);
	_reset_settle(gsm);
	return FALSE;
}

static int _reset_do(int fd, unsigned int baudrate, unsigned int hwflow)
{
	struct stat st;
	int fl;
	struct termios term;

	if(flock(fd, LOCK_EX | LOCK_NB) != 0)
		return 1;
	fl = fcntl(fd, F_GETFL, 0);
	if(fcntl(fd, F_SETFL, fl & ~O_NONBLOCK) == -1)
		return 1;
	if(fstat(fd, &st) != 0)
		return 1;
	if(st.st_mode & S_IFCHR) /* character special */
	{
		if(tcgetattr(fd, &term) != 0)
			return 1;
		term.c_cflag |= CS8;
		term.c_cflag |= CREAD;
		if(hwflow)
			term.c_cflag |= CRTSCTS;
		else
			term.c_cflag |= CLOCAL;
		term.c_iflag = (IGNPAR | IGNBRK);
		term.c_lflag = 0;
		term.c_oflag = 0;
		term.c_cc[VMIN] = 1;
		term.c_cc[VTIME] = 0;
		if(cfsetospeed(&term, baudrate) != 0)
			/* otherwise ignore error */
			phone_error(NULL, "/dev/modem", 0);
		if(tcsetattr(fd, TCSAFLUSH, &term) != 0)
			return 1;
	}
	return 0;
}

static gboolean _reset_settle(gpointer data)
{
	GSM * gsm = data;

	_gsm_modem_reset(gsm);
	return TRUE;
}


/* on_watch_can_read */
static gboolean _on_watch_can_read(GIOChannel * source, GIOCondition condition,
		gpointer data)
{
	GSM * gsm = data;
	gsize cnt = 0;
	GError * error = NULL;
	GIOStatus status;
	char * p;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s()\n", __func__);
#endif
	if(condition != G_IO_IN || source != gsm->channel)
		return FALSE; /* should not happen */
	if((p = realloc(gsm->rd_buf, gsm->rd_buf_cnt + 256)) == NULL)
		return TRUE; /* XXX retries immediately (delay?) */
	gsm->rd_buf = p;
	status = g_io_channel_read_chars(source, &gsm->rd_buf[gsm->rd_buf_cnt],
			256, &cnt, &error);
#ifdef DEBUG
	fprintf(stderr, "%s", "DEBUG: MODEM: ");
	fwrite(&gsm->rd_buf[gsm->rd_buf_cnt], sizeof(*p), cnt, stderr);
#endif
	gsm->rd_buf_cnt += cnt;
	switch(status)
	{
		case G_IO_STATUS_NORMAL:
			break;
		case G_IO_STATUS_ERROR:
			phone_error(NULL, error->message, 0);
		case G_IO_STATUS_EOF:
		default: /* should not happen... */
			if(gsm->retry > 0)
				gsm_reset(gsm, gsm->retry);
			gsm->rd_source = 0;
			return FALSE;
	}
	_gsm_parse(gsm);
	return TRUE;
}


/* on_watch_can_write */
static gboolean _on_watch_can_write(GIOChannel * source, GIOCondition condition,
		gpointer data)
{
	GSM * gsm = data;
	gsize cnt = 0;
	GError * error = NULL;
	GIOStatus status;
	char * p;
	GSMCommand * gsmc;

#ifdef DEBUG
	fprintf(stderr, "DEBUG: %s() cnt=%lu\n", __func__, gsm->wr_buf_cnt);
#endif
	if(condition != G_IO_OUT || source != gsm->channel)
		return FALSE; /* should not happen */
	status = g_io_channel_write_chars(source, gsm->wr_buf, gsm->wr_buf_cnt,
			&cnt, &error);
#ifdef DEBUG
	fprintf(stderr, "%s", "DEBUG: PHONE: ");
	fwrite(gsm->wr_buf, sizeof(*p), cnt, stderr);
#endif
	if(cnt != 0) /* some data may have been written anyway */
	{
		gsm->wr_buf_cnt -= cnt;
		memmove(gsm->wr_buf, &gsm->wr_buf[cnt], gsm->wr_buf_cnt);
		if((p = realloc(gsm->wr_buf, gsm->wr_buf_cnt)) != NULL)
			gsm->wr_buf = p; /* we can ignore errors... */
		else if(gsm->wr_buf_cnt == 0)
			gsm->wr_buf = NULL; /* ...except when it's not one */
	}
	switch(status)
	{
		case G_IO_STATUS_NORMAL:
			break;
		case G_IO_STATUS_ERROR:
			phone_error(NULL, error->message, 0);
		case G_IO_STATUS_EOF:
		default: /* should not happen */
			if(gsm->retry > 0)
				gsm_reset(gsm, gsm->retry);
			gsm->wr_source = 0;
			return FALSE;
	}
	if(gsm->wr_buf_cnt > 0) /* there is more data to write */
		return TRUE;
	gsm->wr_source = 0;
	if(gsm->mode == GSM_MODE_INIT)
		_gsm_queue_pop(gsm);
	else if(gsm->queue != NULL && (gsmc = gsm->queue->data) != NULL)
		gsm->mode = _gsm_command_get_mode(gsmc);
	return FALSE;
}