2010-01-18 14:31:18 +00:00
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/*
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*
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* AT server library with GLib integration
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*
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* Copyright (C) 2008-2010 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <glib.h>
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#include "ringbuffer.h"
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#include "gatserver.h"
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2010-02-01 21:00:45 +00:00
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enum ParserState {
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PARSER_STATE_IDLE,
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PARSER_STATE_A,
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PARSER_STATE_COMMAND,
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PARSER_STATE_GARBAGE,
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};
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enum ParserResult {
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PARSER_RESULT_COMMAND,
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PARSER_RESULT_EMPTY_COMMAND,
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PARSER_RESULT_REPEAT_LAST,
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PARSER_RESULT_GARBAGE,
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PARSER_RESULT_UNSURE,
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};
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2010-01-18 14:31:18 +00:00
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/* V.250 Table 1/V.250 Result codes */
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2010-01-29 20:15:37 +00:00
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static const char *server_result_to_string(GAtServerResult result)
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{
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switch (result) {
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case G_AT_SERVER_RESULT_OK:
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return "OK";
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case G_AT_SERVER_RESULT_CONNECT:
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return "CONNECT";
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case G_AT_SERVER_RESULT_RING:
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return "RING";
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case G_AT_SERVER_RESULT_NO_CARRIER:
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return "NO CARRIER";
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case G_AT_SERVER_RESULT_ERROR:
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return "ERROR";
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case G_AT_SERVER_RESULT_NO_DIALTONE:
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return "NO DIALTONE";
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case G_AT_SERVER_RESULT_BUSY:
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return "BUSY";
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case G_AT_SERVER_RESULT_NO_ANSWER:
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return "NO ANSWER";
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default:
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return NULL;
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}
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}
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2010-01-18 14:31:18 +00:00
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/* Basic command setting for V.250 */
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struct v250_settings {
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char s3; /* set by S3=<val> */
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char s4; /* set by S4=<val> */
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char s5; /* set by S5=<val> */
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gboolean echo; /* set by E<val> */
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gboolean quiet; /* set by Q<val> */
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gboolean is_v1; /* set by V<val>, v0 or v1 */
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unsigned int res_format; /* set by X<val> */
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unsigned int c109; /* set by &C<val> */
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unsigned int c108; /* set by &D<val> */
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};
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struct _GAtServer {
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gint ref_count; /* Ref count */
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struct v250_settings v250; /* V.250 command setting */
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GIOChannel *server_io; /* Server IO */
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int server_watch; /* Watch for server IO */
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guint read_so_far; /* Number of bytes processed */
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GAtDisconnectFunc user_disconnect; /* User disconnect func */
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gpointer user_disconnect_data; /* User disconnect data */
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GAtDebugFunc debugf; /* Debugging output function */
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gpointer debug_data; /* Data to pass to debug func */
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struct ring_buffer *buf; /* Current read buffer */
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2010-01-29 21:18:16 +00:00
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guint max_read_attempts; /* Max reads per select */
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2010-02-01 21:00:45 +00:00
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enum ParserState parser_state;
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2010-01-18 14:31:18 +00:00
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};
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2010-01-29 20:15:37 +00:00
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static void g_at_server_send_result(GAtServer *server, GAtServerResult result)
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2010-01-18 14:31:18 +00:00
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{
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struct v250_settings v250 = server->v250;
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2010-01-29 20:15:37 +00:00
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const char *result_str = server_result_to_string(result);
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2010-01-18 14:31:18 +00:00
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char buf[1024];
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char t = v250.s3;
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char r = v250.s4;
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gsize wbuf;
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if (v250.quiet)
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return;
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2010-01-29 20:15:37 +00:00
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if (result_str == NULL)
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return;
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2010-01-18 14:31:18 +00:00
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if (v250.is_v1)
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2010-01-29 20:15:37 +00:00
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sprintf(buf, "%c%c%s%c%c", t, r, result_str, t, r);
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2010-01-18 14:31:18 +00:00
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else
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2010-01-29 20:15:37 +00:00
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sprintf(buf, "%u%c", (unsigned int) result, t);
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2010-01-18 14:31:18 +00:00
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2010-01-29 19:28:03 +00:00
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g_at_util_debug_chat(FALSE, buf, strlen(buf),
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server->debugf, server->debug_data);
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2010-01-18 14:31:18 +00:00
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g_io_channel_write(server->server_io, (char *) buf, strlen(buf),
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&wbuf);
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}
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static inline gboolean is_at_command_prefix(const char c)
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{
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2010-02-01 21:00:45 +00:00
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switch (c) {
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case '+':
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case '*':
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case '!':
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case '%':
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return TRUE;
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default:
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2010-01-18 14:31:18 +00:00
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return FALSE;
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2010-02-01 21:00:45 +00:00
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}
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2010-01-18 14:31:18 +00:00
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}
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2010-02-01 21:00:45 +00:00
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static void parse_at_command(GAtServer *server, char *buf)
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2010-01-18 14:31:18 +00:00
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{
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2010-02-01 21:00:45 +00:00
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g_at_server_send_result(server, G_AT_SERVER_RESULT_ERROR);
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2010-01-18 14:31:18 +00:00
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}
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2010-02-01 21:00:45 +00:00
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static void parse_v250_settings(GAtServer *server, char *buf)
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2010-01-18 14:31:18 +00:00
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{
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2010-02-01 21:00:45 +00:00
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g_at_server_send_result(server, G_AT_SERVER_RESULT_ERROR);
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2010-01-18 14:31:18 +00:00
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}
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2010-02-01 21:00:45 +00:00
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static void server_parse_line(GAtServer *server, char *line)
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2010-01-18 14:31:18 +00:00
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{
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gsize i = 0;
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char c;
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2010-02-01 21:00:45 +00:00
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if (line == NULL) {
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g_at_server_send_result(server, G_AT_SERVER_RESULT_ERROR);
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goto done;
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}
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if (line[0] == '\0') {
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g_at_server_send_result(server, G_AT_SERVER_RESULT_OK);
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goto done;
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}
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2010-01-18 14:31:18 +00:00
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2010-02-01 21:00:45 +00:00
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c = line[i];
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2010-01-18 14:31:18 +00:00
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/* skip semicolon */
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if (c == ';')
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2010-02-01 21:00:45 +00:00
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c = line[++i];
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2010-01-18 14:31:18 +00:00
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if (is_at_command_prefix(c) || c == 'A' || c == 'D' || c == 'H')
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2010-02-01 21:00:45 +00:00
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parse_at_command(server, line + i);
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2010-01-18 14:31:18 +00:00
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else if (g_ascii_isalpha(c) || c == '&')
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2010-02-01 21:00:45 +00:00
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parse_v250_settings(server, line + i);
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else
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g_at_server_send_result(server, G_AT_SERVER_RESULT_ERROR);
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2010-01-18 14:31:18 +00:00
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2010-02-01 21:00:45 +00:00
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done:
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g_free(line);
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2010-01-18 14:31:18 +00:00
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}
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2010-02-01 21:00:45 +00:00
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static enum ParserResult server_feed(GAtServer *server,
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const char *bytes, gsize *len)
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2010-01-18 14:31:18 +00:00
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{
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gsize i = 0;
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2010-02-01 21:00:45 +00:00
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enum ParserResult res = PARSER_RESULT_UNSURE;
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char s3 = server->v250.s3;
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while (i < *len) {
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char byte = bytes[i];
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switch (server->parser_state) {
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case PARSER_STATE_IDLE:
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if (byte == s3) {
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i += 1;
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res = PARSER_RESULT_EMPTY_COMMAND;
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goto out;
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} else if (byte == '\n') {
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i += 1;
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res = PARSER_RESULT_GARBAGE;
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goto out;
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} else if (byte == 'A' || byte == 'a')
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server->parser_state = PARSER_STATE_A;
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else if (byte != ' ' && byte != '\t')
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server->parser_state = PARSER_STATE_GARBAGE;
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break;
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2010-01-18 14:31:18 +00:00
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2010-02-01 21:00:45 +00:00
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case PARSER_STATE_A:
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if (byte == s3) {
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server->parser_state = PARSER_STATE_IDLE;
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i += 1;
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res = PARSER_RESULT_GARBAGE;
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goto out;
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2010-02-02 13:23:22 +00:00
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} else if (byte == '/') {
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2010-02-01 21:00:45 +00:00
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server->parser_state = PARSER_STATE_IDLE;
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2010-02-02 13:23:22 +00:00
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i += 1;
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2010-02-01 21:00:45 +00:00
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res = PARSER_RESULT_REPEAT_LAST;
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goto out;
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2010-02-02 13:23:22 +00:00
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} else if (byte == 'T' || byte == 't')
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server->parser_state = PARSER_STATE_COMMAND;
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else
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2010-02-01 21:00:45 +00:00
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server->parser_state = PARSER_STATE_GARBAGE;
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2010-01-18 14:31:18 +00:00
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2010-02-01 21:00:45 +00:00
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break;
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2010-01-18 14:31:18 +00:00
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2010-02-01 21:00:45 +00:00
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case PARSER_STATE_COMMAND:
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if (byte == s3) {
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server->parser_state = PARSER_STATE_IDLE;
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i += 1;
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res = PARSER_RESULT_COMMAND;
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goto out;
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}
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break;
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2010-01-18 14:31:18 +00:00
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2010-02-01 21:00:45 +00:00
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case PARSER_STATE_GARBAGE:
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if (byte == s3) {
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server->parser_state = PARSER_STATE_IDLE;
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i += 1;
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res = PARSER_RESULT_GARBAGE;
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goto out;
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}
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break;
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default:
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break;
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};
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2010-01-18 14:31:18 +00:00
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2010-02-01 21:00:45 +00:00
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i += 1;
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}
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out:
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*len = i;
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return res;
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2010-01-18 14:31:18 +00:00
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}
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2010-02-01 21:00:45 +00:00
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static char *extract_line(GAtServer *p)
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2010-01-18 14:31:18 +00:00
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{
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unsigned int wrap = ring_buffer_len_no_wrap(p->buf);
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unsigned int pos = 0;
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unsigned char *buf = ring_buffer_read_ptr(p->buf, pos);
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int strip_front = 0;
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int line_length = 0;
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2010-02-01 23:58:48 +00:00
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gboolean in_string = FALSE;
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2010-02-01 21:00:45 +00:00
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char *line;
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2010-02-01 23:58:48 +00:00
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int i;
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2010-01-18 14:31:18 +00:00
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while (pos < p->read_so_far) {
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2010-02-01 23:58:48 +00:00
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if (*buf == '"')
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in_string = !in_string;
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if (in_string == FALSE && (*buf == ' ' || *buf == '\t')) {
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if (line_length == 0)
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2010-01-18 14:31:18 +00:00
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strip_front += 1;
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2010-02-01 23:58:48 +00:00
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} else
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2010-01-18 14:31:18 +00:00
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line_length += 1;
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buf += 1;
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pos += 1;
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if (pos == wrap)
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buf = ring_buffer_read_ptr(p->buf, pos);
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}
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2010-02-01 21:00:45 +00:00
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/* We will strip AT and \r */
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line_length -= 3;
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2010-01-18 14:31:18 +00:00
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line = g_try_new(char, line_length + 1);
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if (!line) {
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ring_buffer_drain(p->buf, p->read_so_far);
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return NULL;
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}
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2010-02-01 21:00:45 +00:00
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/* Strip leading whitespace + AT */
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ring_buffer_drain(p->buf, strip_front + 2);
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2010-02-01 23:58:48 +00:00
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pos = 0;
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i = 0;
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wrap = ring_buffer_len_no_wrap(p->buf);
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buf = ring_buffer_read_ptr(p->buf, pos);
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while (pos < (p->read_so_far - strip_front - 2)) {
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if (*buf == '"')
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in_string = !in_string;
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if ((*buf == ' ' || *buf == '\t') && in_string == FALSE)
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; /* Skip */
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else if (*buf != '\r')
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line[i++] = *buf;
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buf += 1;
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pos += 1;
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if (pos == wrap)
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buf = ring_buffer_read_ptr(p->buf, pos);
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}
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2010-02-01 21:00:45 +00:00
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/* Strip \r */
|
2010-02-01 23:58:48 +00:00
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ring_buffer_drain(p->buf, p->read_so_far - strip_front - 2);
|
2010-01-18 14:31:18 +00:00
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2010-02-01 23:58:48 +00:00
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line[i] = '\0';
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2010-01-18 14:31:18 +00:00
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return line;
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}
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|
|
|
|
|
static void new_bytes(GAtServer *p)
|
|
|
|
{
|
|
|
|
unsigned int len = ring_buffer_len(p->buf);
|
|
|
|
unsigned int wrap = ring_buffer_len_no_wrap(p->buf);
|
|
|
|
unsigned char *buf = ring_buffer_read_ptr(p->buf, p->read_so_far);
|
2010-02-01 21:00:45 +00:00
|
|
|
enum ParserState result;
|
2010-01-18 14:31:18 +00:00
|
|
|
|
2010-02-01 21:00:45 +00:00
|
|
|
while (p->server_io && (p->read_so_far < len)) {
|
2010-01-18 14:31:18 +00:00
|
|
|
gsize rbytes = MIN(len - p->read_so_far, wrap - p->read_so_far);
|
2010-02-01 21:00:45 +00:00
|
|
|
result = server_feed(p, (char *)buf, &rbytes);
|
2010-01-18 14:31:18 +00:00
|
|
|
|
2010-02-01 21:00:45 +00:00
|
|
|
buf += rbytes;
|
2010-01-18 14:31:18 +00:00
|
|
|
p->read_so_far += rbytes;
|
|
|
|
|
|
|
|
if (p->read_so_far == wrap) {
|
|
|
|
buf = ring_buffer_read_ptr(p->buf, p->read_so_far);
|
|
|
|
wrap = len;
|
|
|
|
}
|
|
|
|
|
2010-02-01 21:00:45 +00:00
|
|
|
if (result == PARSER_RESULT_UNSURE)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
switch (result) {
|
|
|
|
case PARSER_RESULT_EMPTY_COMMAND:
|
|
|
|
/*
|
|
|
|
* According to section 5.2.4 and 5.6 of V250,
|
|
|
|
* Empty commands must be OK by the DCE
|
|
|
|
*/
|
|
|
|
g_at_server_send_result(p, G_AT_SERVER_RESULT_OK);
|
|
|
|
ring_buffer_drain(p->buf, p->read_so_far);
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PARSER_RESULT_COMMAND:
|
|
|
|
server_parse_line(p, extract_line(p));
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PARSER_RESULT_REPEAT_LAST:
|
|
|
|
/* TODO */
|
|
|
|
g_at_server_send_result(p, G_AT_SERVER_RESULT_OK);
|
|
|
|
ring_buffer_drain(p->buf, p->read_so_far);
|
|
|
|
break;
|
2010-01-18 14:31:18 +00:00
|
|
|
|
2010-02-01 21:00:45 +00:00
|
|
|
default:
|
|
|
|
ring_buffer_drain(p->buf, p->read_so_far);
|
|
|
|
break;
|
2010-01-18 14:31:18 +00:00
|
|
|
}
|
2010-02-01 21:00:45 +00:00
|
|
|
|
|
|
|
len -= p->read_so_far;
|
|
|
|
wrap -= p->read_so_far;
|
|
|
|
p->read_so_far = 0;
|
2010-01-18 14:31:18 +00:00
|
|
|
}
|
2010-02-01 21:00:45 +00:00
|
|
|
|
|
|
|
/* We're overflowing the buffer, shutdown the socket */
|
|
|
|
if (p->buf && ring_buffer_avail(p->buf) == 0)
|
|
|
|
g_source_remove(p->server_watch);
|
2010-01-18 14:31:18 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static gboolean received_data(GIOChannel *channel, GIOCondition cond,
|
|
|
|
gpointer data)
|
|
|
|
{
|
|
|
|
unsigned char *buf;
|
|
|
|
GAtServer *server = data;
|
|
|
|
GIOError err;
|
|
|
|
gsize rbytes;
|
|
|
|
gsize toread;
|
2010-01-29 21:18:16 +00:00
|
|
|
guint total_read = 0;
|
|
|
|
guint read_count = 0;
|
2010-01-18 14:31:18 +00:00
|
|
|
|
|
|
|
if (cond & G_IO_NVAL)
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
do {
|
|
|
|
toread = ring_buffer_avail_no_wrap(server->buf);
|
|
|
|
|
|
|
|
if (toread == 0)
|
|
|
|
break;
|
|
|
|
|
|
|
|
rbytes = 0;
|
|
|
|
buf = ring_buffer_write_ptr(server->buf);
|
|
|
|
|
|
|
|
err = g_io_channel_read(channel, (char *) buf, toread, &rbytes);
|
2010-01-29 19:28:03 +00:00
|
|
|
g_at_util_debug_chat(TRUE, (char *)buf, rbytes,
|
|
|
|
server->debugf, server->debug_data);
|
2010-01-18 14:31:18 +00:00
|
|
|
|
2010-01-29 21:18:16 +00:00
|
|
|
read_count++;
|
2010-01-18 14:31:18 +00:00
|
|
|
|
2010-01-29 21:18:16 +00:00
|
|
|
total_read += rbytes;
|
|
|
|
|
|
|
|
if (rbytes > 0)
|
|
|
|
ring_buffer_write_advance(server->buf, rbytes);
|
|
|
|
} while (err == G_IO_ERROR_NONE && rbytes > 0 &&
|
|
|
|
read_count < server->max_read_attempts);
|
2010-01-18 14:31:18 +00:00
|
|
|
|
2010-01-29 21:18:16 +00:00
|
|
|
if (total_read > 0)
|
|
|
|
new_bytes(server);
|
2010-01-18 14:31:18 +00:00
|
|
|
|
|
|
|
if (cond & (G_IO_HUP | G_IO_ERR))
|
|
|
|
return FALSE;
|
|
|
|
|
2010-01-29 21:18:16 +00:00
|
|
|
if (read_count > 0 && rbytes == 0 && err != G_IO_ERROR_AGAIN)
|
2010-01-18 14:31:18 +00:00
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void server_watcher_destroy_notify(GAtServer *server)
|
|
|
|
{
|
|
|
|
server->server_watch = 0;
|
|
|
|
|
|
|
|
ring_buffer_free(server->buf);
|
|
|
|
server->buf = NULL;
|
|
|
|
|
|
|
|
server->server_io = NULL;
|
|
|
|
|
|
|
|
if (server->user_disconnect)
|
|
|
|
server->user_disconnect(server->user_disconnect_data);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void v250_settings_create(struct v250_settings *v250)
|
|
|
|
{
|
|
|
|
v250->s3 = '\r';
|
|
|
|
v250->s4 = '\n';
|
|
|
|
v250->s5 = '\b';
|
|
|
|
v250->echo = TRUE;
|
|
|
|
v250->quiet = FALSE;
|
|
|
|
v250->is_v1 = TRUE;
|
|
|
|
v250->res_format = 0;
|
|
|
|
v250->c109 = 1;
|
|
|
|
v250->c108 = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
GAtServer *g_at_server_new(GIOChannel *io)
|
|
|
|
{
|
|
|
|
GAtServer *server;
|
|
|
|
|
|
|
|
if (!io)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
server = g_try_new0(GAtServer, 1);
|
|
|
|
if (!server)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
server->ref_count = 1;
|
|
|
|
v250_settings_create(&server->v250);
|
|
|
|
server->server_io = io;
|
|
|
|
server->buf = ring_buffer_new(4096);
|
2010-01-29 21:18:16 +00:00
|
|
|
server->max_read_attempts = 3;
|
2010-01-18 14:31:18 +00:00
|
|
|
|
|
|
|
if (!server->buf)
|
|
|
|
goto error;
|
|
|
|
|
2010-01-29 19:28:03 +00:00
|
|
|
if (!g_at_util_setup_io(server->server_io, G_IO_FLAG_NONBLOCK))
|
2010-01-18 14:31:18 +00:00
|
|
|
goto error;
|
|
|
|
|
2010-01-29 21:18:58 +00:00
|
|
|
server->server_watch = g_io_add_watch_full(io, G_PRIORITY_DEFAULT,
|
2010-01-18 14:31:18 +00:00
|
|
|
G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_NVAL,
|
|
|
|
received_data, server,
|
|
|
|
(GDestroyNotify)server_watcher_destroy_notify);
|
|
|
|
|
|
|
|
return server;
|
|
|
|
|
|
|
|
error:
|
|
|
|
if (server->buf)
|
|
|
|
ring_buffer_free(server->buf);
|
|
|
|
|
|
|
|
if (server)
|
|
|
|
g_free(server);
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
GAtServer *g_at_server_ref(GAtServer *server)
|
|
|
|
{
|
|
|
|
if (server == NULL)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
g_atomic_int_inc(&server->ref_count);
|
|
|
|
|
|
|
|
return server;
|
|
|
|
}
|
|
|
|
|
|
|
|
void g_at_server_unref(GAtServer *server)
|
|
|
|
{
|
|
|
|
gboolean is_zero;
|
|
|
|
|
|
|
|
if (server == NULL)
|
|
|
|
return;
|
|
|
|
|
|
|
|
is_zero = g_atomic_int_dec_and_test(&server->ref_count);
|
|
|
|
|
|
|
|
if (is_zero == FALSE)
|
|
|
|
return;
|
|
|
|
|
|
|
|
g_at_server_shutdown(server);
|
|
|
|
}
|
|
|
|
|
|
|
|
gboolean g_at_server_shutdown(GAtServer *server)
|
|
|
|
{
|
|
|
|
if (!server)
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
/* Don't trigger user disconnect on shutdown */
|
|
|
|
server->user_disconnect = NULL;
|
|
|
|
server->user_disconnect_data = NULL;
|
|
|
|
|
|
|
|
if (server->server_watch) {
|
|
|
|
g_source_remove(server->server_watch);
|
|
|
|
server->server_watch = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
g_free(server);
|
|
|
|
server = NULL;
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
gboolean g_at_server_set_disconnect_function(GAtServer *server,
|
|
|
|
GAtDisconnectFunc disconnect,
|
|
|
|
gpointer user)
|
|
|
|
{
|
|
|
|
if (server == NULL)
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
server->user_disconnect = disconnect;
|
|
|
|
server->user_disconnect_data = user;
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|
|
|
|
|
|
|
|
gboolean g_at_server_set_debug(GAtServer *server, GAtDebugFunc func,
|
|
|
|
gpointer user)
|
|
|
|
{
|
|
|
|
if (server == NULL)
|
|
|
|
return FALSE;
|
|
|
|
|
|
|
|
server->debugf = func;
|
|
|
|
server->debug_data = user;
|
|
|
|
|
|
|
|
return TRUE;
|
|
|
|
}
|