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asterisk/apps/app_cut.c

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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Cut application
*
* Copyright (c) 2003 Tilghman Lesher. All rights reserved.
*
* Tilghman Lesher <app_cut__v003@the-tilghman.com>
*
* $Id$
*
* This code is released by the author with no restrictions on usage.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/options.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/module.h>
/* Maximum length of any variable */
#define MAXRESULT 1024
static char *tdesc = "Cuts up variables";
static char *app_cut = "Cut";
static char *cut_synopsis = "Cut(newvar=varname|delimiter|fieldspec)";
static char *cut_descrip =
"Cut(newvar=varname,delimiter,field)\n"
" newvar - new variable created from result string\n"
" varname - variable you want cut\n"
" delimiter - defaults to '-'\n"
" fieldspec - number of the field you want (1-based offset)\n"
" may also be specified as a range (with -)\n"
" or group of ranges and fields (with &)\n"
" Returns 0 or -1 on hangup or error.\n";
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
static int cut_exec(struct ast_channel *chan, void *data)
{
int res=0;
struct localuser *u;
char *s, *newvar=NULL, *varname=NULL, *delimiter=NULL, *field=NULL;
int args_okay = 0;
LOCAL_USER_ADD(u);
/* Check and parse arguments */
if (data) {
s = ast_strdupa((char *)data);
if (s) {
newvar = strsep(&s, "=");
if (newvar && (newvar[0] != '\0')) {
varname = strsep(&s, "|");
if (varname && (varname[0] != '\0')) {
delimiter = strsep(&s, "|");
if (delimiter) {
field = strsep(&s, "|");
if (field) {
args_okay = 1;
}
}
}
}
} else {
ast_log(LOG_ERROR, "Out of memory\n");
res = -1;
}
}
if (args_okay) {
char d, ds[2];
char *tmp = alloca(strlen(varname) + 4);
char varvalue[MAXRESULT], *tmp2=varvalue;
char retstring[MAXRESULT];
memset(retstring, 0, MAXRESULT);
if (tmp) {
snprintf(tmp, strlen(varname) + 4, "${%s}", varname);
memset(varvalue, 0, sizeof(varvalue));
} else {
ast_log(LOG_ERROR, "Out of memory");
return -1;
}
if (delimiter[0])
d = delimiter[0];
else
d = '-';
/* String form of the delimiter, for use with strsep(3) */
sprintf(ds,"%c",d);
pbx_substitute_variables_helper(chan, tmp, tmp2, MAXRESULT - 1);
if (tmp2) {
int curfieldnum = 1;
while ((tmp2 != NULL) && (field != NULL)) {
char *nextgroup = strsep(&field, "&");
int num1 = 0, num2 = MAXRESULT;
char trashchar;
if (sscanf(nextgroup, "%d-%d", &num1, &num2) == 2) {
/* range with both start and end */
} else if (sscanf(nextgroup, "-%d", &num2) == 1) {
/* range with end */
num1 = 0;
} else if ((sscanf(nextgroup, "%d%c", &num1, &trashchar) == 2) && (trashchar == '-')) {
/* range with start */
num2 = MAXRESULT;
} else if (sscanf(nextgroup, "%d", &num1) == 1) {
/* single number */
num2 = num1;
} else {
ast_log(LOG_ERROR, "Cut(): Illegal range '%s'\n", nextgroup);
ast_log(LOG_ERROR, "Usage: %s\n", cut_synopsis);
return -1;
}
/* Get to start, if any */
if (num1 > 0) {
while ((tmp2 != (char *)NULL + 1) && (curfieldnum < num1)) {
tmp2 = index(tmp2, d) + 1;
curfieldnum++;
}
}
/* Most frequent problem is the expectation of reordering fields */
if ((num1 > 0) && (curfieldnum > num1)) {
ast_log(LOG_WARNING, "Cut(): we're already past the field you wanted?\n");
}
/* Re-null tmp2 if we added 1 to NULL */
if (tmp2 == (char *)NULL + 1)
tmp2 = NULL;
/* Output fields until we either run out of fields or num2 is reached */
while ((tmp2 != NULL) && (curfieldnum <= num2)) {
char *tmp3 = strsep(&tmp2, ds);
int curlen = strlen(retstring);
if (strlen(retstring)) {
snprintf(retstring + curlen, MAXRESULT - curlen, "%c%s", d, tmp3);
} else {
snprintf(retstring, MAXRESULT, "%s", tmp3);
}
curfieldnum++;
}
}
}
pbx_builtin_setvar_helper(chan, newvar, retstring);
}
LOCAL_USER_REMOVE(u);
return res;
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
return ast_unregister_application(app_cut);
}
int load_module(void)
{
return ast_register_application(app_cut, cut_exec, cut_synopsis, cut_descrip);
}
char *description(void)
{
return tdesc;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}