sys/kern/subr_dnvlist.c

   1 /*-
   2  * Copyright (c) 2013 The FreeBSD Foundation
   3  * All rights reserved.
   4  *
   5  * This software was developed by Pawel Jakub Dawidek under sponsorship from
   6  * the FreeBSD Foundation.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #ifdef _KERNEL
  34
  35 #include <sys/types.h>
  36 #include <sys/param.h>
  37 #include <sys/kernel.h>
  38 #include <sys/systm.h>
  39 #include <sys/malloc.h>
  40
  41 #include <machine/stdarg.h>
  42
  43 #else
  44 #include <stdarg.h>
  45 #include <stdbool.h>
  46 #include <stdint.h>
  47 #include <stdlib.h>
  48 #endif
  49
  50 #include <sys/nv.h>
  51 #include <sys/nv_impl.h>
  52
  53 #include <sys/dnv.h>
  54
  55 #define DNVLIST_GET(ftype, type)                                        \
  56 ftype                                                                   \
  57 dnvlist_get_##type(const nvlist_t *nvl, const char *name, ftype defval) \
  58 {                                                                       \
  59                                                                         \
  60         if (nvlist_exists_##type(nvl, name))                            \
  61                 return (nvlist_get_##type(nvl, name));                  \
  62         else                                                            \
  63                 return (defval);                                        \
  64 }
  65
  66 DNVLIST_GET(bool, bool)
  67 DNVLIST_GET(uint64_t, number)
  68 DNVLIST_GET(const char *, string)
  69 DNVLIST_GET(const nvlist_t *, nvlist)
  70 #ifndef _KERNEL
  71 DNVLIST_GET(int, descriptor)
  72 #endif
  73
  74 #undef  DNVLIST_GET
  75
  76 const void *
  77 dnvlist_get_binary(const nvlist_t *nvl, const char *name, size_t *sizep,
  78     const void *defval, size_t defsize)
  79 {
  80         const void *value;
  81
  82         if (nvlist_exists_binary(nvl, name))
  83                 value = nvlist_get_binary(nvl, name, sizep);
  84         else {
  85                 if (sizep != NULL)
  86                         *sizep = defsize;
  87                 value = defval;
  88         }
  89         return (value);
  90 }
  91
  92 #define DNVLIST_TAKE(ftype, type)                                       \
  93 ftype                                                                   \
  94 dnvlist_take_##type(nvlist_t *nvl, const char *name, ftype defval)      \
  95 {                                                                       \
  96                                                                         \
  97         if (nvlist_exists_##type(nvl, name))                            \
  98                 return (nvlist_take_##type(nvl, name));                 \
  99         else                                                            \
 100                 return (defval);                                        \
 101 }
 102
 103 DNVLIST_TAKE(bool, bool)
 104 DNVLIST_TAKE(uint64_t, number)
 105 DNVLIST_TAKE(char *, string)
 106 DNVLIST_TAKE(nvlist_t *, nvlist)
 107 #ifndef _KERNEL
 108 DNVLIST_TAKE(int, descriptor)
 109 #endif
 110
 111 #undef  DNVLIST_TAKE
 112
 113 void *
 114 dnvlist_take_binary(nvlist_t *nvl, const char *name, size_t *sizep,
 115     void *defval, size_t defsize)
 116 {
 117         void *value;
 118
 119         if (nvlist_exists_binary(nvl, name))
 120                 value = nvlist_take_binary(nvl, name, sizep);
 121         else {
 122                 if (sizep != NULL)
 123                         *sizep = defsize;
 124                 value = defval;
 125         }
 126         return (value);
 127 }
 128