fprintf(stderr, "%s\n", chld_err.line[i]);
			}
		}
	}
	regfree(&ireg);
	regfree(&sreg);
	if(do_exclude!=NULL) regfree(&ereg); 
	free(cmdline);
	return result;
}

/* run an apt-get update (needs root) */
int run_update(void){
	int i=0, result=STATE_UNKNOWN;
	struct output chld_out, chld_err;
	char *cmdline;

	/* run the upgrade */
	cmdline = construct_cmdline(NO_UPGRADE, update_opts);
	result = np_runcmd(cmdline, &chld_out, &chld_err, 0);
	/* apt-get update changes exit status if it can't fetch packages.
	 * since we were explicitly asked to do so, this is treated as
	 * a critical error. */
	if(result != 0){
		exec_warning=1;
		result = STATE_CRITICAL;
		fprintf(stderr, _("'%s' exited with non-zero status.\n"),
		        cmdline);
	}

	if(verbose){
		for(i = 0; i < chld_out.lines; i++) {
			printf("%s\n", chld_out.line[i]);
		}
	}

	/* If we get anything on stderr, at least set warning */
	if(chld_err.buflen){
		stderr_warning=1;
		result = max_state(result, STATE_WARNING);
		if(verbose){
			for(i = 0; i < chld_err.lines; i++) {
				fprintf(stderr, "%s\n", chld_err.line[i]);
			}
		}
	}
	free(cmdline);
	return result;
}

char* add_to_regexp(char *expr, const char *next){
	char *re=NULL;

	if(expr==NULL){
		re=malloc(sizeof(char)*(strlen("^Inst () ")+strlen(next)+1));
		if(!re) die(STATE_UNKNOWN, "malloc failed!\n");
		sprintf(re, "^Inst (%s) ", next);
	} else {
		/* resize it, adding an extra char for the new '|' separator */
		re=realloc(expr, sizeof(char)*strlen(expr)+1+strlen(next)+1);
		if(!re) die(STATE_UNKNOWN, "realloc failed!\n");
		/* append it starting at ')' in the old re */
		sprintf((char*)(re+strlen(re)-2), "|%s) ", next);
	}

	return re;	
}

char* construct_cmdline(upgrade_type u, const char *opts){
	int len=0;
	const char *opts_ptr=NULL, *aptcmd=NULL;
	char *cmd=NULL;

	switch(u){
	case UPGRADE:
		if(opts==NULL) opts_ptr=UPGRADE_DEFAULT_OPTS;
		else opts_ptr=opts;
		aptcmd="upgrade";
		break;
	case DIST_UPGRADE:
		if(opts==NULL) opts_ptr=UPGRADE_DEFAULT_OPTS;
		else opts_ptr=opts;
		aptcmd="dist-upgrade";
		break;
	case NO_UPGRADE:
		if(opts==NULL) opts_ptr=UPDATE_DEFAULT_OPTS;
		else opts_ptr=opts;
		aptcmd="update";
		break;
	}

	len+=strlen(PATH_TO_APTGET)+1; /* "/usr/bin/apt-get " */
	len+=strlen(opts_ptr)+1;       /* "opts " */
	len+=strlen(aptcmd)+1;         /* "upgrade\0" */

	cmd=(char*)malloc(sizeof(char)*len);
	if(cmd==NULL) die(STATE_UNKNOWN, "malloc failed");
	sprintf(cmd, "%s %s %s", PATH_TO_APTGET, opts_ptr, aptcmd);
	return cmd;
}