git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1666 65c4cc65-6c06-0410-ace0-fbb531ad65f3
199 lines
4.5 KiB
C
Executable file
199 lines
4.5 KiB
C
Executable file
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Cut application
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*
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* Copyright (c) 2003 Tilghman Lesher. All rights reserved.
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*
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* Tilghman Lesher <app_cut__v002@the-tilghman.com>
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*
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* $Id$
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*
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* This code is released by the author with no restrictions on usage.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <asterisk/file.h>
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#include <asterisk/logger.h>
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#include <asterisk/options.h>
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#include <asterisk/channel.h>
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#include <asterisk/pbx.h>
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#include <asterisk/module.h>
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/* Maximum length of any variable */
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#define MAXRESULT 1024
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static char *tdesc = "Cuts up variables";
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static char *app_cut = "Cut";
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static char *cut_synopsis = "Cut(newvar=varname|delimiter|fieldspec)";
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static char *cut_descrip =
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"Cut(varname=varname,delimiter,field)\n"
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" newvar - result string is set to this variable\n"
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" varname - variable you want cut\n"
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" delimiter - defaults to -\n"
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" fieldspec - number of the field you want (1-based offset)\n"
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" may also be specified as a range (with -)\n"
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" or group of ranges and fields (with &)\n"
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" Returns 0 or -1 on hangup or error.\n";
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STANDARD_LOCAL_USER;
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LOCAL_USER_DECL;
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static int cut_exec(struct ast_channel *chan, void *data)
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{
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int res=0;
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struct localuser *u;
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char *s, *newvar=NULL, *varname=NULL, *delimiter=NULL, *field=NULL;
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int args_okay = 0;
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LOCAL_USER_ADD(u);
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/* Check and parse arguments */
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if (data) {
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s = ast_strdupa((char *)data);
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if (s) {
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newvar = strsep(&s, "=");
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if (newvar && (newvar[0] != '\0')) {
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varname = strsep(&s, "|");
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if (varname && (varname[0] != '\0')) {
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delimiter = strsep(&s, "|");
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if (delimiter) {
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field = strsep(&s, "|");
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if (field) {
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args_okay = 1;
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}
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}
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}
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}
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} else {
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ast_log(LOG_ERROR, "Out of memory\n");
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res = -1;
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}
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}
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if (args_okay) {
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char d, ds[2];
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char *tmp = alloca(strlen(varname) + 4);
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char *tmp2 = alloca(MAXRESULT);
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char retstring[MAXRESULT];
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memset(retstring, 0, MAXRESULT);
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if (tmp && tmp2) {
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snprintf(tmp, strlen(varname) + 4, "${%s}", varname);
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memset(tmp2, 0, sizeof(tmp2));
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} else {
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ast_log(LOG_ERROR, "Out of memory");
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return -1;
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}
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if (delimiter[0])
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d = delimiter[0];
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else
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d = '-';
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/* String form of the delimiter, for use with strsep(3) */
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sprintf(ds,"%c",d);
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pbx_substitute_variables_helper(chan, tmp, tmp2, MAXRESULT - 1);
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if (tmp2) {
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int curfieldnum = 1;
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while ((tmp2 != NULL) && (field != NULL)) {
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char *nextgroup = strsep(&field, "&");
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int num1 = 0, num2 = MAXRESULT;
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char trashchar;
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if (sscanf(nextgroup, "%d-%d", &num1, &num2) == 2) {
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/* range with both start and end */
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} else if (sscanf(nextgroup, "-%d", &num2) == 1) {
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/* range with end */
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num1 = 0;
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} else if ((sscanf(nextgroup, "%d%c", &num1, &trashchar) == 2) && (trashchar == '-')) {
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/* range with start */
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num2 = MAXRESULT;
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} else if (sscanf(nextgroup, "%d", &num1) == 1) {
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/* single number */
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num2 = num1;
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} else {
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ast_log(LOG_ERROR, "Cut(): Illegal range '%s'\n", nextgroup);
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ast_log(LOG_ERROR, "Usage: %s\n", cut_synopsis);
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return -1;
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}
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/* Get to start, if any */
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if (num1 > 0) {
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while ((tmp2 != (char *)NULL + 1) && (curfieldnum < num1)) {
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tmp2 = index(tmp2, d) + 1;
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curfieldnum++;
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}
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}
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/* Most frequent problem is the expectation of reordering fields */
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if ((num1 > 0) && (curfieldnum > num1)) {
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ast_log(LOG_WARNING, "Cut(): we're already past the field you wanted?\n");
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}
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/* Re-null tmp2 if we added 1 to NULL */
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if (tmp2 == (char *)NULL + 1)
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tmp2 = NULL;
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/* Output fields until we either run out of fields or num2 is reached */
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while ((tmp2 != NULL) && (curfieldnum <= num2)) {
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char *tmp3 = strsep(&tmp2, ds);
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int curlen = strlen(retstring);
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if (strlen(retstring)) {
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snprintf(retstring + curlen, MAXRESULT - curlen, "%c%s", d, tmp3);
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} else {
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snprintf(retstring, MAXRESULT, "%s", tmp3);
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}
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curfieldnum++;
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}
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}
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}
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pbx_builtin_setvar_helper(chan, newvar, retstring);
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}
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LOCAL_USER_REMOVE(u);
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return res;
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}
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int unload_module(void)
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{
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STANDARD_HANGUP_LOCALUSERS;
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return ast_unregister_application(app_cut);
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}
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int load_module(void)
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{
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return ast_register_application(app_cut, cut_exec, cut_synopsis, cut_descrip);
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}
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char *description(void)
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{
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return tdesc;
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}
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int usecount(void)
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{
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int res;
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STANDARD_USECOUNT(res);
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return res;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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