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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2005-2006, Digium, Inc.
* Portions Copyright (C) 2005, Tilghman Lesher. All rights reserved.
* Portions Copyright (C) 2005, Anthony Minessale II
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
*
* \brief String manipulation dialplan functions
*
* \author Tilghman Lesher
* \author Anothony Minessale II
* \ingroup functions
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include <ctype.h>
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/utils.h"
#include "asterisk/app.h"
AST_THREADSTORAGE(result_buf);
/*** DOCUMENTATION
<function name="SPRINTF" language="en_US">
<synopsis>
Format a variable according to a format string.
</synopsis>
<syntax>
<parameter name="format" required="true" />
<parameter name="arg1" required="true" />
<parameter name="arg2" multiple="true" />
<parameter name="argN" />
</syntax>
<description>
<para>Parses the format string specified and returns a string matching
that format. Supports most options found in <emphasis>sprintf(3)</emphasis>.
Returns a shortened string if a format specifier is not recognized.</para>
</description>
<see-also>
<ref type="manpage">sprintf(3)</ref>
</see-also>
</function>
***/
static int acf_sprintf(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
#define SPRINTF_FLAG 0
#define SPRINTF_WIDTH 1
#define SPRINTF_PRECISION 2
#define SPRINTF_LENGTH 3
#define SPRINTF_CONVERSION 4
int i, state = -1, argcount = 0;
char *formatstart = NULL, *bufptr = buf;
char formatbuf[256] = "";
int tmpi;
double tmpd;
AST_DECLARE_APP_ARGS(arg,
AST_APP_ARG(format);
AST_APP_ARG(var)[100];
);
AST_STANDARD_APP_ARGS(arg, data);
/* Scan the format, converting each argument into the requisite format type. */
for (i = 0; arg.format[i]; i++) {
switch (state) {
case SPRINTF_FLAG:
if (strchr("#0- +'I", arg.format[i]))
break;
state = SPRINTF_WIDTH;
case SPRINTF_WIDTH:
if (arg.format[i] >= '0' && arg.format[i] <= '9')
break;
/* Next character must be a period to go into a precision */
if (arg.format[i] == '.') {
state = SPRINTF_PRECISION;
} else {
state = SPRINTF_LENGTH;
i--;
}
break;
case SPRINTF_PRECISION:
if (arg.format[i] >= '0' && arg.format[i] <= '9')
break;
state = SPRINTF_LENGTH;
case SPRINTF_LENGTH:
if (strchr("hl", arg.format[i])) {
if (arg.format[i + 1] == arg.format[i])
i++;
state = SPRINTF_CONVERSION;
break;
} else if (strchr("Lqjzt", arg.format[i])) {
state = SPRINTF_CONVERSION;
break;
}
state = SPRINTF_CONVERSION;
case SPRINTF_CONVERSION:
if (strchr("diouxXc", arg.format[i])) {
/* Integer */
/* Isolate this format alone */
ast_copy_string(formatbuf, formatstart, sizeof(formatbuf));
formatbuf[&arg.format[i] - formatstart + 1] = '\0';
/* Convert the argument into the required type */
if (arg.var[argcount]) {
if (sscanf(arg.var[argcount++], "%30d", &tmpi) != 1) {
ast_log(LOG_ERROR, "Argument '%s' is not an integer number for format '%s'\n", arg.var[argcount - 1], formatbuf);
goto sprintf_fail;
}
} else {
ast_log(LOG_ERROR, "SPRINTF() has more format specifiers than arguments!\n");
goto sprintf_fail;
}
/* Format the argument */
snprintf(bufptr, buf + len - bufptr, formatbuf, tmpi);
/* Update the position of the next parameter to print */
bufptr = strchr(buf, '\0');
} else if (strchr("eEfFgGaA", arg.format[i])) {
/* Double */
/* Isolate this format alone */
ast_copy_string(formatbuf, formatstart, sizeof(formatbuf));
formatbuf[&arg.format[i] - formatstart + 1] = '\0';
/* Convert the argument into the required type */
if (arg.var[argcount]) {
if (sscanf(arg.var[argcount++], "%30lf", &tmpd) != 1) {
ast_log(LOG_ERROR, "Argument '%s' is not a floating point number for format '%s'\n", arg.var[argcount - 1], formatbuf);
goto sprintf_fail;
}
} else {
ast_log(LOG_ERROR, "SPRINTF() has more format specifiers than arguments!\n");
goto sprintf_fail;
}
/* Format the argument */
snprintf(bufptr, buf + len - bufptr, formatbuf, tmpd);
/* Update the position of the next parameter to print */
bufptr = strchr(buf, '\0');
} else if (arg.format[i] == 's') {
/* String */
/* Isolate this format alone */
ast_copy_string(formatbuf, formatstart, sizeof(formatbuf));
formatbuf[&arg.format[i] - formatstart + 1] = '\0';
/* Format the argument */
snprintf(bufptr, buf + len - bufptr, formatbuf, arg.var[argcount++]);
/* Update the position of the next parameter to print */
bufptr = strchr(buf, '\0');
} else if (arg.format[i] == '%') {
/* Literal data to copy */
*bufptr++ = arg.format[i];
} else {
/* Not supported */
/* Isolate this format alone */
ast_copy_string(formatbuf, formatstart, sizeof(formatbuf));
formatbuf[&arg.format[i] - formatstart + 1] = '\0';
ast_log(LOG_ERROR, "Format type not supported: '%s' with argument '%s'\n", formatbuf, arg.var[argcount++]);
goto sprintf_fail;
}
state = -1;
break;
default:
if (arg.format[i] == '%') {
state = SPRINTF_FLAG;
formatstart = &arg.format[i];
break;
} else {
/* Literal data to copy */
*bufptr++ = arg.format[i];
}
}
}
*bufptr = '\0';
return 0;
sprintf_fail:
return -1;
}
static struct ast_custom_function sprintf_function = {
.name = "SPRINTF",
.read = acf_sprintf,
};
static int unload_module(void)
{
int res = 0;
res |= ast_custom_function_unregister(&sprintf_function);
return res;
}
static int load_module(void)
{
int res = 0;
res |= ast_custom_function_register(&sprintf_function);
return res;
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "SPRINTF dialplan function");
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