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 */
  19
  20 #ifndef __jack_varargs_h__
  21 #define __jack_varargs_h__
  22
  23 #include <stdlib.h>
  24 #include <stdarg.h>
  25 #include <string.h>
  26 #include "types.h"
  27
  28 #ifdef __cplusplus
  29 extern "C"
  30 {
  31 #endif
  32
  33     /* variable argument structure */
  34     typedef struct {
  35         char *server_name;              /* server name */
  36         char *load_name;                /* load module name */
  37         char *load_init;                /* initialization string */
  38         int   session_id;               /* requested session_id */
  39     }
  40     jack_varargs_t;
  41
  42     static const char* jack_default_server_name (void)
  43     {
  44         const char *server_name;
  45         if ((server_name = getenv("JACK_DEFAULT_SERVER")) == NULL)
  46             server_name = "default";
  47         return server_name;
  48     }
  49
  50     static inline void jack_varargs_init (jack_varargs_t *va)
  51     {
  52         memset (va, 0, sizeof(jack_varargs_t));
  53         va->server_name = (char*)jack_default_server_name();
  54         va->session_id = -1;
  55     }
  56
  57     static inline void jack_varargs_parse (jack_options_t options, va_list ap, jack_varargs_t *va)
  58     {
  59         // initialize default settings
  60         jack_varargs_init (va);
  61
  62         if ((options & JackServerName)) {
  63             char *sn = va_arg(ap, char *);
  64             if (sn)
  65                 va->server_name = sn;
  66         }
  67         if ((options & JackLoadName))
  68             va->load_name = va_arg(ap, char *);
  69         if ((options & JackLoadInit))
  70             va->load_init = va_arg(ap, char *);
  71         if ((options & JackSessionID)) {
  72             char *sid = va_arg(ap, char *);
  73             if (sid)
  74                 va->session_id = atoi( sid );
  75         }
  76     }
  77
  78 #ifdef __cplusplus
  79 }
  80 #endif
  81
  82 #endif /* __jack_varargs_h__ */