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dnvlist.c revision 1.1 
      1 /*-
      2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      3  *
      4  * Copyright (c) 2013 The FreeBSD Foundation
      5  * All rights reserved.
      6  *
      7  * This software was developed by Pawel Jakub Dawidek under sponsorship from
      8  * the FreeBSD Foundation.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __FBSDID("$FreeBSD: head/sys/contrib/libnv/dnvlist.c 328474 2018-01-27 12:58:21Z oshogbo $");
     34 
     35 #ifdef _KERNEL
     36 
     37 #include <sys/types.h>
     38 #include <sys/param.h>
     39 #include <sys/kernel.h>
     40 #include <sys/systm.h>
     41 #include <sys/malloc.h>
     42 
     43 #include <machine/stdarg.h>
     44 
     45 #else
     46 #include <stdarg.h>
     47 #include <stdbool.h>
     48 #include <stdint.h>
     49 #include <stdlib.h>
     50 #endif
     51 
     52 #include <sys/dnv.h>
     53 #include <sys/nv.h>
     54 
     55 #include "nv_impl.h"
     56 
     57 #define	DNVLIST_GET(ftype, type)					\
     58 ftype									\
     59 dnvlist_get_##type(const nvlist_t *nvl, const char *name, ftype defval)	\
     60 {									\
     61 									\
     62 	if (nvlist_exists_##type(nvl, name))				\
     63 		return (nvlist_get_##type(nvl, name));			\
     64 	else								\
     65 		return (defval);					\
     66 }
     67 
     68 DNVLIST_GET(bool, bool)
     69 DNVLIST_GET(uint64_t, number)
     70 DNVLIST_GET(const char *, string)
     71 DNVLIST_GET(const nvlist_t *, nvlist)
     72 #ifndef _KERNEL
     73 DNVLIST_GET(int, descriptor)
     74 #endif
     75 
     76 #undef	DNVLIST_GET
     77 
     78 const void *
     79 dnvlist_get_binary(const nvlist_t *nvl, const char *name, size_t *sizep,
     80     const void *defval, size_t defsize)
     81 {
     82 	const void *value;
     83 
     84 	if (nvlist_exists_binary(nvl, name))
     85 		value = nvlist_get_binary(nvl, name, sizep);
     86 	else {
     87 		if (sizep != NULL)
     88 			*sizep = defsize;
     89 		value = defval;
     90 	}
     91 	return (value);
     92 }
     93 
     94 #define	DNVLIST_TAKE(ftype, type)					\
     95 ftype									\
     96 dnvlist_take_##type(nvlist_t *nvl, const char *name, ftype defval)	\
     97 {									\
     98 									\
     99 	if (nvlist_exists_##type(nvl, name))				\
    100 		return (nvlist_take_##type(nvl, name));			\
    101 	else								\
    102 		return (defval);					\
    103 }
    104 
    105 DNVLIST_TAKE(bool, bool)
    106 DNVLIST_TAKE(uint64_t, number)
    107 DNVLIST_TAKE(char *, string)
    108 DNVLIST_TAKE(nvlist_t *, nvlist)
    109 #ifndef _KERNEL
    110 DNVLIST_TAKE(int, descriptor)
    111 #endif
    112 
    113 #undef	DNVLIST_TAKE
    114 
    115 void *
    116 dnvlist_take_binary(nvlist_t *nvl, const char *name, size_t *sizep,
    117     void *defval, size_t defsize)
    118 {
    119 	void *value;
    120 
    121 	if (nvlist_exists_binary(nvl, name))
    122 		value = nvlist_take_binary(nvl, name, sizep);
    123 	else {
    124 		if (sizep != NULL)
    125 			*sizep = defsize;
    126 		value = defval;
    127 	}
    128 	return (value);
    129 }
    130 
    131