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      1 /*	$NetBSD: err.h,v 1.3 2019/04/16 10:00:04 mrg Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_ERR_H_
     33 #define _LINUX_ERR_H_
     34 
     35 /* XXX Linux uses long and int inconsistently here.  Hope this works out.  */
     36 
     37 #include <sys/types.h>
     38 #include <sys/errno.h>
     39 #include <sys/systm.h>
     40 
     41 #define	MAX_ERRNO	4095
     42 
     43 static inline bool
     44 IS_ERR_VALUE(uintptr_t n)
     45 {
     46 	return (n >= (uintptr_t)-MAX_ERRNO);
     47 }
     48 
     49 static inline void *
     50 ERR_PTR(long error)
     51 {
     52 	KASSERT(error < 0);
     53 	return (void *)(intptr_t)error;
     54 }
     55 
     56 static inline long
     57 PTR_ERR(const void *ptr)
     58 {
     59 	KASSERT(ptr == (void *)(intptr_t)(long)(intptr_t)ptr); /* XXX Hurk!  */
     60 	return (long)(intptr_t)ptr;
     61 }
     62 
     63 static inline bool
     64 IS_ERR(const void *ptr)
     65 {
     66 	return IS_ERR_VALUE((uintptr_t)ptr);
     67 }
     68 
     69 static inline bool
     70 IS_ERR_OR_NULL(const void *ptr)
     71 {
     72 	return ((ptr == NULL) || IS_ERR(ptr));
     73 }
     74 
     75 static inline void *
     76 ERR_CAST(void *ptr)		/* XXX Linux declares with const.  */
     77 {
     78 	return ptr;
     79 }
     80 
     81 static inline long
     82 PTR_ERR_OR_ZERO(const void *ptr)
     83 {
     84 	return (IS_ERR(ptr)? PTR_ERR(ptr) : 0);
     85 }
     86 
     87 #define	PTR_RET	PTR_ERR_OR_ZERO
     88 
     89 #endif  /* _LINUX_ERR_H_ */
     90