common/varargs.h

   1 /*
   2 *  Copyright (C) 2004 Jack O'Quin
   3 *
   4 *  This program is free software; you can redistribute it and/or modify
   5 *  it under the terms of the GNU Lesser General Public License as published by
   6 *  the Free Software Foundation; either version 2.1 of the License, or
   7 *  (at your option) any later version.
   8 *
   9 *  This program is distributed in the hope that it will be useful,
  10 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 *  GNU Lesser General Public License for more details.
  13 *
  14 *  You should have received a copy of the GNU Lesser General Public License
  15 *  along with this program; if not, write to the Free Software
  16 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17 *
  18 *  $Id: varargs.h,v 1.3 2005/11/23 11:24:00 letz Exp $
  19 */
  20
  21 #ifndef __jack_varargs_h__
  22 #define __jack_varargs_h__
  23
  24 #include <stdlib.h>
  25 #include <stdarg.h>
  26
  27 #ifdef __cplusplus
  28 extern "C"
  29 {
  30 #endif
  31
  32     /* variable argument structure */
  33     typedef struct {
  34         char *server_name;              /* server name */
  35         char *load_name;                /* load module name */
  36         char *load_init;                /* initialization string */
  37     }
  38     jack_varargs_t;
  39
  40     static char* jack_default_server_name (void) {
  41         char *server_name;
  42         if ((server_name = getenv("JACK_DEFAULT_SERVER")) == NULL)
  43             server_name = "default";
  44         return server_name;
  45     }
  46
  47     static inline void jack_varargs_init (jack_varargs_t *va) {
  48         memset (va, 0, sizeof(jack_varargs_t));
  49         va->server_name = jack_default_server_name();
  50     }
  51
  52     static inline void jack_varargs_parse (jack_options_t options, va_list ap, jack_varargs_t *va) {
  53         // initialize default settings
  54         jack_varargs_init (va);
  55
  56         if ((options & JackServerName)) {
  57             char *sn = va_arg(ap, char *);
  58             if (sn)
  59                 va->server_name = sn;
  60         }
  61         if ((options & JackLoadName))
  62             va->load_name = va_arg(ap, char *);
  63         if ((options & JackLoadInit))
  64             va->load_init = va_arg(ap, char *);
  65     }
  66
  67 #ifdef __cplusplus
  68 }
  69 #endif
  70
  71 #endif /* __jack_varargs_h__ */