func_strings.c

		} else if (*dataptr == '"') {
			*bufptr++ = '\\';
			*bufptr++ = '"';
		} else if (*dataptr == '\0') {
			break;
		} else {
			*bufptr++ = *dataptr;
		}
	}
	*bufptr++ = '"';
	*bufptr = '\0';
	return 0;
}

static struct ast_custom_function quote_function = {
	.name = "QUOTE",
	.read = quote,
};

static int csv_quote(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
	char *bufptr = buf, *dataptr = data;

	if (len < 3){ /* at least two for quotes and one for binary zero */
		ast_log(LOG_ERROR, "Not enough buffer");
		return -1;
	}

	if (ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "No argument specified!\n");
		ast_copy_string(buf,"\"\"",len);
		return 0;
	}

	*bufptr++ = '"';
	for (; bufptr < buf + len - 3; dataptr++){
		if (*dataptr == '"') {
			*bufptr++ = '"';
			*bufptr++ = '"';
		} else if (*dataptr == '\0') {
			break;
		} else {
			*bufptr++ = *dataptr;
		}
	}
	*bufptr++ = '"';
	*bufptr='\0';
	return 0;
}

static struct ast_custom_function csv_quote_function = {
	.name = "CSV_QUOTE",
	.read = csv_quote,
};

static int len(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
{
	int length = 0;

	if (data)
		length = strlen(data);

	snprintf(buf, buflen, "%d", length);

	return 0;
}

static struct ast_custom_function len_function = {
	.name = "LEN",
	.read = len,
	.read_max = 12,
};

static int acf_strftime(struct ast_channel *chan, const char *cmd, char *parse,
			char *buf, size_t buflen)
{
	AST_DECLARE_APP_ARGS(args,
			     AST_APP_ARG(epoch);
			     AST_APP_ARG(timezone);
			     AST_APP_ARG(format);
	);
	struct timeval when;
	struct ast_tm tm;

	buf[0] = '\0';

	AST_STANDARD_APP_ARGS(args, parse);

	ast_get_timeval(args.epoch, &when, ast_tvnow(), NULL);
	ast_localtime(&when, &tm, args.timezone);

	if (!args.format)
		args.format = "%c";

	if (ast_strftime(buf, buflen, args.format, &tm) <= 0)
		ast_log(LOG_WARNING, "C function strftime() output nothing?!!\n");

	buf[buflen - 1] = '\0';

	return 0;
}

static struct ast_custom_function strftime_function = {
	.name = "STRFTIME",
	.read = acf_strftime,
};

static int acf_strptime(struct ast_channel *chan, const char *cmd, char *data,
			char *buf, size_t buflen)
{
	AST_DECLARE_APP_ARGS(args,
			     AST_APP_ARG(timestring);
			     AST_APP_ARG(timezone);
			     AST_APP_ARG(format);
	);
	struct ast_tm tm;

	buf[0] = '\0';

	if (!data) {
		ast_log(LOG_ERROR,
				"Asterisk function STRPTIME() requires an argument.\n");
		return -1;
	}

	AST_STANDARD_APP_ARGS(args, data);

	if (ast_strlen_zero(args.format)) {
		ast_log(LOG_ERROR,
				"No format supplied to STRPTIME(<timestring>,<timezone>,<format>)");
		return -1;
	}

	if (!ast_strptime(args.timestring, args.format, &tm)) {
		ast_log(LOG_WARNING, "STRPTIME() found no time specified within the string\n");
	} else {
		struct timeval when;
		when = ast_mktime(&tm, args.timezone);
		snprintf(buf, buflen, "%d", (int) when.tv_sec);
	}

	return 0;
}

static struct ast_custom_function strptime_function = {
	.name = "STRPTIME",
	.read = acf_strptime,
};

static int function_eval(struct ast_channel *chan, const char *cmd, char *data,
			 char *buf, size_t buflen)
{
	if (ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "EVAL requires an argument: EVAL(<string>)\n");
		return -1;
	}

	pbx_substitute_variables_helper(chan, data, buf, buflen - 1);

	return 0;
}

static int function_eval2(struct ast_channel *chan, const char *cmd, char *data,
			 struct ast_str **buf, ssize_t buflen)
{
	if (ast_strlen_zero(data)) {
		ast_log(LOG_WARNING, "EVAL requires an argument: EVAL(<string>)\n");
		return -1;
	}

	ast_str_substitute_variables(buf, buflen, chan, data);

	return 0;
}

static struct ast_custom_function eval_function = {
	.name = "EVAL",
	.read = function_eval,
	.read2 = function_eval2,
};

static int keypadhash(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
{
	char *bufptr, *dataptr;

	for (bufptr = buf, dataptr = data; bufptr < buf + buflen - 1; dataptr++) {
		if (*dataptr == '\0') {
			*bufptr++ = '\0';
			break;
		} else if (*dataptr == '1') {
			*bufptr++ = '1';
		} else if (strchr("AaBbCc2", *dataptr)) {
			*bufptr++ = '2';
		} else if (strchr("DdEeFf3", *dataptr)) {
			*bufptr++ = '3';
		} else if (strchr("GgHhIi4", *dataptr)) {
			*bufptr++ = '4';
		} else if (strchr("JjKkLl5", *dataptr)) {
			*bufptr++ = '5';
		} else if (strchr("MmNnOo6", *dataptr)) {
			*bufptr++ = '6';
		} else if (strchr("PpQqRrSs7", *dataptr)) {
			*bufptr++ = '7';
		} else if (strchr("TtUuVv8", *dataptr)) {
			*bufptr++ = '8';
		} else if (strchr("WwXxYyZz9", *dataptr)) {
			*bufptr++ = '9';
		} else if (*dataptr == '0') {
			*bufptr++ = '0';
		}
	}
	buf[buflen - 1] = '\0';

	return 0;
}

static struct ast_custom_function keypadhash_function = {
	.name = "KEYPADHASH",
	.read = keypadhash,
};

static int string_toupper(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
{
	char *bufptr = buf, *dataptr = data;

	while ((bufptr < buf + buflen - 1) && (*bufptr++ = toupper(*dataptr++)));

	return 0;
}

static int string_toupper2(struct ast_channel *chan, const char *cmd, char *data, struct ast_str **buf, ssize_t buflen)
{
	char *bufptr, *dataptr = data;

	if (buflen > -1) {
		ast_str_make_space(buf, buflen > 0 ? buflen : strlen(data) + 1);
	}
	bufptr = ast_str_buffer(*buf);
	while ((bufptr < ast_str_buffer(*buf) + ast_str_size(*buf) - 1) && (*bufptr++ = toupper(*dataptr++)));
	ast_str_update(*buf);

	return 0;
}

static struct ast_custom_function toupper_function = {
	.name = "TOUPPER",
	.read = string_toupper,
	.read2 = string_toupper2,
};

static int string_tolower(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
{
	char *bufptr = buf, *dataptr = data;

	while ((bufptr < buf + buflen - 1) && (*bufptr++ = tolower(*dataptr++)));

	return 0;
}

static int string_tolower2(struct ast_channel *chan, const char *cmd, char *data, struct ast_str **buf, ssize_t buflen)
{
	char *bufptr, *dataptr = data;

	if (buflen > -1) {
		ast_str_make_space(buf, buflen > 0 ? buflen : strlen(data) + 1);
	}
	bufptr = ast_str_buffer(*buf);
	while ((bufptr < ast_str_buffer(*buf) + ast_str_size(*buf) - 1) && (*bufptr++ = tolower(*dataptr++)));
	ast_str_update(*buf);

	return 0;
}

static struct ast_custom_function tolower_function = {
	.name = "TOLOWER",
	.read = string_tolower,
	.read2 = string_tolower2,
};

static int shift_pop(struct ast_channel *chan, const char *cmd, char *data, struct ast_str **buf, ssize_t len)
{
#define beginning	(cmd[0] == 'S') /* SHIFT */
	char *after, delimiter[2] = ",", *varsubst;
	size_t unused;
	struct ast_str *before = ast_str_thread_get(&result_buf, 16);
	char *(*search_func)(const char *s, int c) = (beginning ? strchr : strrchr);
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(var);
		AST_APP_ARG(delimiter);
	);

	if (!before) {
		return -1;
	}

	AST_STANDARD_APP_ARGS(args, data);

	if (ast_strlen_zero(args.var)) {
		ast_log(LOG_WARNING, "%s requires a variable name\n", cmd);
		return -1;
	}

	varsubst = alloca(strlen(args.var) + 4);
	sprintf(varsubst, "${%s}", args.var);
	ast_str_substitute_variables(&before, 0, chan, varsubst);

	if (args.argc > 1 && !ast_strlen_zero(args.delimiter)) {
		ast_get_encoded_char(args.delimiter, delimiter, &unused);
	}

	if (!ast_str_strlen(before)) {
		/* Nothing to pop */
		return -1;
	}

	if (!(after = search_func(ast_str_buffer(before), delimiter[0]))) {
		/* Only one entry in array */
		ast_str_set(buf, len, "%s", ast_str_buffer(before));
		pbx_builtin_setvar_helper(chan, args.var, "");
	} else {
		*after++ = '\0';
		ast_str_set(buf, len, "%s", beginning ? ast_str_buffer(before) : after);
		pbx_builtin_setvar_helper(chan, args.var, beginning ? after : ast_str_buffer(before));
	}

	return 0;
#undef beginning
}

static struct ast_custom_function shift_function = {
	.name = "SHIFT",
	.read2 = shift_pop,
};

static struct ast_custom_function pop_function = {
	.name = "POP",
	.read2 = shift_pop,
};

static int unshift_push(struct ast_channel *chan, const char *cmd, char *data, const char *new_value)
{
#define beginning	(cmd[0] == 'U') /* UNSHIFT */
	char delimiter[2] = ",", *varsubst;
	size_t unused;
	struct ast_str *buf, *previous_value;
	AST_DECLARE_APP_ARGS(args,
		AST_APP_ARG(var);
		AST_APP_ARG(delimiter);
	);

	if (!(buf = ast_str_thread_get(&result_buf, 16)) ||
		!(previous_value = ast_str_thread_get(&tmp_buf, 16))) {
		return -1;
	}

	AST_STANDARD_APP_ARGS(args, data);

	if (ast_strlen_zero(args.var)) {
		ast_log(LOG_WARNING, "%s requires a variable name\n", cmd);
		return -1;
	}

	if (args.argc > 1 && !ast_strlen_zero(args.delimiter)) {
		ast_get_encoded_char(args.delimiter, delimiter, &unused);
	}

	varsubst = alloca(strlen(args.var) + 4);
	sprintf(varsubst, "${%s}", args.var);
	ast_str_substitute_variables(&previous_value, 0, chan, varsubst);

	if (!ast_str_strlen(previous_value)) {
		ast_str_set(&buf, 0, "%s", new_value);
	} else {
		ast_str_set(&buf, 0, "%s%c%s",
			beginning ? new_value : ast_str_buffer(previous_value),
			delimiter[0],
			beginning ? ast_str_buffer(previous_value) : new_value);
	}

	pbx_builtin_setvar_helper(chan, args.var, ast_str_buffer(buf));

	return 0;
#undef beginning
}

static struct ast_custom_function push_function = {
	.name = "PUSH",
	.write = unshift_push,
};

static struct ast_custom_function unshift_function = {
	.name = "UNSHIFT",
	.write = unshift_push,
};

static int passthru(struct ast_channel *chan, const char *cmd, char *data, struct ast_str **buf, ssize_t len)
{
	ast_str_set(buf, len, "%s", data);
	return 0;
}

static struct ast_custom_function passthru_function = {
	.name = "PASSTHRU",
	.read2 = passthru,
};

static int unload_module(void)
{
	int res = 0;

	res |= ast_custom_function_unregister(&fieldqty_function);
	res |= ast_custom_function_unregister(&filter_function);
	res |= ast_custom_function_unregister(&replace_function);
	res |= ast_custom_function_unregister(&listfilter_function);
	res |= ast_custom_function_unregister(&regex_function);
	res |= ast_custom_function_unregister(&array_function);
	res |= ast_custom_function_unregister(&quote_function);
	res |= ast_custom_function_unregister(&csv_quote_function);
	res |= ast_custom_function_unregister(&len_function);
	res |= ast_custom_function_unregister(&strftime_function);
	res |= ast_custom_function_unregister(&strptime_function);
	res |= ast_custom_function_unregister(&eval_function);
	res |= ast_custom_function_unregister(&keypadhash_function);
	res |= ast_custom_function_unregister(&hashkeys_function);
	res |= ast_custom_function_unregister(&hash_function);
	res |= ast_unregister_application(app_clearhash);
	res |= ast_custom_function_unregister(&toupper_function);
	res |= ast_custom_function_unregister(&tolower_function);
	res |= ast_custom_function_unregister(&shift_function);
	res |= ast_custom_function_unregister(&pop_function);
	res |= ast_custom_function_unregister(&push_function);
	res |= ast_custom_function_unregister(&unshift_function);
	res |= ast_custom_function_unregister(&passthru_function);

	return res;
}

static int load_module(void)
{
	int res = 0;

	res |= ast_custom_function_register(&fieldqty_function);
	res |= ast_custom_function_register(&filter_function);
	res |= ast_custom_function_register(&replace_function);
	res |= ast_custom_function_register(&listfilter_function);
	res |= ast_custom_function_register(&regex_function);
	res |= ast_custom_function_register(&array_function);
	res |= ast_custom_function_register(&quote_function);
	res |= ast_custom_function_register(&csv_quote_function);
	res |= ast_custom_function_register(&len_function);
	res |= ast_custom_function_register(&strftime_function);
	res |= ast_custom_function_register(&strptime_function);
	res |= ast_custom_function_register(&eval_function);
	res |= ast_custom_function_register(&keypadhash_function);
	res |= ast_custom_function_register(&hashkeys_function);
	res |= ast_custom_function_register(&hash_function);
	res |= ast_register_application_xml(app_clearhash, exec_clearhash);
	res |= ast_custom_function_register(&toupper_function);
	res |= ast_custom_function_register(&tolower_function);
	res |= ast_custom_function_register(&shift_function);
	res |= ast_custom_function_register(&pop_function);
	res |= ast_custom_function_register(&push_function);
	res |= ast_custom_function_register(&unshift_function);
	res |= ast_custom_function_register(&passthru_function);

	return res;
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "String handling dialplan functions");