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     }
  39     jack_varargs_t;
  40
  41     static const char* jack_default_server_name (void)
  42         {
  43         const char *server_name;
  44         if ((server_name = getenv("JACK_DEFAULT_SERVER")) == NULL)
  45             server_name = "default";
  46         return server_name;
  47     }
  48
  49     static inline void jack_varargs_init (jack_varargs_t *va)
  50         {
  51         memset (va, 0, sizeof(jack_varargs_t));
  52         va->server_name = (char*)jack_default_server_name();
  53     }
  54
  55     static inline void jack_varargs_parse (jack_options_t options, va_list ap, jack_varargs_t *va)
  56         {
  57         // initialize default settings
  58         jack_varargs_init (va);
  59
  60         if ((options & JackServerName)) {
  61             char *sn = va_arg(ap, char *);
  62             if (sn)
  63                 va->server_name = sn;
  64         }
  65         if ((options & JackLoadName))
  66             va->load_name = va_arg(ap, char *);
  67         if ((options & JackLoadInit))
  68             va->load_init = va_arg(ap, char *);
  69     }
  70
  71 #ifdef __cplusplus
  72 }
  73 #endif
  74
  75 #endif /* __jack_varargs_h__ */