From ee8ab98a736c742308b4941f1f897095db77cacc Mon Sep 17 00:00:00 2001 From: Zhihao Cheng Date: Mon, 11 Nov 2024 16:36:43 +0800 Subject: ubifs-utils: Add linux kernel error conversion definitions Add linux kernel error conversion definitions, because there are many error type conversions(eg. PTR_ERR, ERR_PTR) used in UBIFS linux kernel libs. This is a preparation for replacing implementation of UBIFS utils with linux kernel libs. Signed-off-by: Zhihao Cheng Signed-off-by: David Oberhollenzer --- ubifs-utils/common/linux_err.h | 62 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 ubifs-utils/common/linux_err.h (limited to 'ubifs-utils/common/linux_err.h') diff --git a/ubifs-utils/common/linux_err.h b/ubifs-utils/common/linux_err.h new file mode 100644 index 0000000..5c6ddc3 --- /dev/null +++ b/ubifs-utils/common/linux_err.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_ERR_H +#define _LINUX_ERR_H + +/* Adapted from include/linux/err.h */ + +#include + +/* + * Kernel pointers have redundant information, so we can use a + * scheme where we can return either an error code or a normal + * pointer with the same return value. + * + * This should be a per-architecture thing, to allow different + * error and pointer decisions. + */ +#define MAX_ERRNO 4095 + +#define IS_ERR_VALUE(x) ((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) + +static inline void * ERR_PTR(long error) +{ + return (void *) error; +} + +static inline long PTR_ERR(const void *ptr) +{ + return (long) ptr; +} + +static inline bool IS_ERR(const void *ptr) +{ + return IS_ERR_VALUE((unsigned long)ptr); +} + +static inline bool IS_ERR_OR_NULL(const void *ptr) +{ + return !ptr || IS_ERR_VALUE((unsigned long)ptr); +} + +/** + * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type + * @ptr: The pointer to cast. + * + * Explicitly cast an error-valued pointer to another pointer type in such a + * way as to make it clear that's what's going on. + */ +static inline void * ERR_CAST(const void *ptr) +{ + /* cast away the const */ + return (void *) ptr; +} + +static inline int PTR_ERR_OR_ZERO(const void *ptr) +{ + if (IS_ERR(ptr)) + return PTR_ERR(ptr); + else + return 0; +} + +#endif /* _LINUX_ERR_H */ -- cgit v1.2.3