linux-dvb-apps.git - linux-dvb-apps Debian packaging

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/* $Id: property.c,v 1.3 2006/08/13 18:14:03 harbaum Exp $ * * dynamic properties * * Copyright (C) 2006 Michael Reinelt <reinelt@eunet.at> * Copyright (C) 2006 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> * * This file is part of LCD4Linux. * * LCD4Linux is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * LCD4Linux is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * * $Log: property.c,v $ * Revision 1.3 2006/08/13 18:14:03 harbaum * Added KVV plugin * * Revision 1.2 2006/08/13 11:38:20 reinelt * text widget uses dynamic properties * * Revision 1.1 2006/08/13 09:53:10 reinelt * dynamic properties added (used by 'style' of text widget) * */ /* * exported functions: * * void property_load (const char *section, const char *name, const char *defval, PROPERTY *prop) * initializes and loads a property from the config file and pre-compiles it * * void property_free (PROPERTY *prop) * frees all property allocations * * int property_eval(PROPERTY * prop) * evaluates a property; returns 1 if value has changed * * double P2N(PROPERTY * prop) * returns a (already evaluated) property as number * * char *P2S(PROPERTY * prop) * returns a (already evaluated) property as string * */ #include "config.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include "debug.h" #include "cfg.h" #include "evaluator.h" #include "property.h" #ifdef WITH_DMALLOC #include <dmalloc.h> #endif void property_load(const char *section, const char *name, const char *defval, PROPERTY * prop) { /* initialize structure */ prop->name = NULL; prop->expression = NULL; prop->compiled = NULL; DelResult(&prop->result); /* remember the name */ prop->name = strdup(name); /* load expression from config, but do not evaluate it */ prop->expression = cfg_get_raw(section, name, defval); /* pre-compile the expression */ Compile(prop->expression, &prop->compiled); } int property_eval(PROPERTY * prop) { RESULT old; int update = 1; /* this is a bit ugly: we need to remember the old value */ old.type = prop->result.type; old.size = prop->result.size; old.number = prop->result.number; old.string = prop->result.string != NULL ? strdup(prop->result.string) : NULL; DelResult(&prop->result); Eval(prop->compiled, &prop->result); if (prop->result.type & R_NUMBER && old.type & R_NUMBER && prop->result.number == old.number) { update = 0; } if (prop->result.type & R_STRING && old.type & R_STRING && prop->result.size == old.size) { if (prop->result.string == NULL && old.string == NULL) { update = 0; } else if (prop->result.string != NULL && old.string != NULL && strcmp(prop->result.string, old.string) == 0) { update = 0; } } if (old.string) free(old.string); return update; } double P2N(PROPERTY * prop) { if (prop == NULL) { error("Property: internal error: NULL property"); return 0.0; } return R2N(&prop->result); } char *P2S(PROPERTY * prop) { if (prop == NULL) { error("Property: internal error: NULL property"); return NULL; } return R2S(&prop->result); } void property_free(PROPERTY * prop) { if (prop->name != NULL) { free(prop->name); prop->name = NULL; } if (prop->expression != NULL) { /* do *not* free expression */ prop->expression = NULL; } if (prop->compiled != NULL) { free(prop->compiled); prop->compiled = NULL; } DelResult(&prop->result); }


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