The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_dnvlist.c

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    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: stable/10/sys/kern/subr_dnvlist.c 292973 2015-12-31 03:28:14Z ngie $");
   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 

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