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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2013 Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
*/
#ifndef __TYPES_H
#define __TYPES_H
#include <asm/bitsperlong.h>
#include <assert.h>
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
#define STR(x) #x
/* Please keep the macros as much as possible alined with Linux Kernel ones */
/*
* Force a compilation error if condition is true, but also produce a
* result (of value 0 and type int), so the expression can be used
* e.g. in a structure initializer (or where-ever else comma expressions
* aren't permitted).
*/
#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
/* Are two types/vars the same type (ignoring qualifiers)? */
#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
/* &a[0] degrades to a pointer: a different type from an array */
#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
/*
* This returns a constant expression while determining if an argument is
* a constant expression, most importantly without evaluating the argument.
* Glory to Martin Uecker <Martin.Uecker@med.uni-goettingen.de>
*
* Details:
* - sizeof() return an integer constant expression, and does not evaluate
* the value of its operand; it only examines the type of its operand.
* - The results of comparing two integer constant expressions is also
* an integer constant expression.
* - The first literal "8" isn't important. It could be any literal value.
* - The second literal "8" is to avoid warnings about unaligned pointers;
* this could otherwise just be "1".
* - (long)(x) is used to avoid warnings about 64-bit types on 32-bit
* architectures.
* - The C Standard defines "null pointer constant", "(void *)0", as
* distinct from other void pointers.
* - If (x) is an integer constant expression, then the "* 0l" resolves
* it into an integer constant expression of value 0. Since it is cast to
* "void *", this makes the second operand a null pointer constant.
* - If (x) is not an integer constant expression, then the second operand
* resolves to a void pointer (but not a null pointer constant: the value
* is not an integer constant 0).
* - The conditional operator's third operand, "(int *)8", is an object
* pointer (to type "int").
* - The behavior (including the return type) of the conditional operator
* ("operand1 ? operand2 : operand3") depends on the kind of expressions
* given for the second and third operands. This is the central mechanism
* of the macro:
* - When one operand is a null pointer constant (i.e. when x is an integer
* constant expression) and the other is an object pointer (i.e. our
* third operand), the conditional operator returns the type of the
* object pointer operand (i.e. "int *"). Here, within the sizeof(), we
* would then get:
* sizeof(*((int *)(...)) == sizeof(int) == 4
* - When one operand is a void pointer (i.e. when x is not an integer
* constant expression) and the other is an object pointer (i.e. our
* third operand), the conditional operator returns a "void *" type.
* Here, within the sizeof(), we would then get:
* sizeof(*((void *)(...)) == sizeof(void) == 1
* - The equality comparison to "sizeof(int)" therefore depends on (x):
* sizeof(int) == sizeof(int) (x) was a constant expression
* sizeof(int) != sizeof(void) (x) was not a constant expression
*/
#define __is_constexpr(x) \
(sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
/**
* ARRAY_SIZE - get the number of elements in array @arr
* @arr: array to be sized
*/
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
/* BIT handling */
#define _AC(X, Y) (X##Y)
#define _UL(x) (_AC(x, UL))
#define _ULL(x) (_AC(x, ULL))
#define GENMASK_INPUT_CHECK(h, l) \
(BUILD_BUG_ON_ZERO(__builtin_choose_expr( \
__is_constexpr((l) > (h)), (l) > (h), 0)))
#define __GENMASK(h, l) \
(((~_UL(0)) - (_UL(1) << (l)) + 1) & \
(~_UL(0) >> (__BITS_PER_LONG - 1 - (h))))
#define __GENMASK_ULL(h, l) \
(((~_ULL(0)) - (_ULL(1) << (l)) + 1) & \
(~_ULL(0) >> (__BITS_PER_LONG_LONG - 1 - (h))))
#define GENMASK(h, l) \
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
#define GENMASK_ULL(h, l) \
(GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l))
#define BIT(nr) (_UL(1) << (nr))
#define BIT_ULL(nr) (_ULL(1) << (nr))
/* Useful constants */
#define MAX_PATH 1024
#define SZ_512 0x200
/* String copy */
/**
* strscpy - safe implementation of strcpy, with a buffer size
* @dst: destination buffer
* @src: source buffer
* @dsize: size of the destination buffer
*
* Copy string up to @dsize-1 characters. String will end with a '\0'
* character at the end.
*
* Returns: number of characters at the destination buffer or -E2BIG if
* the string was too big to fit.
*/
static inline size_t strscpy(char *dst, const char *src, size_t dsize)
{
size_t i = 0;
for (; i < dsize; i++, dst++, src++) {
*dst = *src;
if (!*dst)
return i;
}
if (i)
dst--;
*dst = '\0';
return -E2BIG;
}
/**
* strscat - safe implementation of strcat, with a buffer size
* @dst: destination buffer
* @src: source buffer
* @dsize: size of the destination buffer
*
* Append string until @dst is up to @dsize-1 characters. String will end
* with a '\0' character at the end.
*
* Returns: number of characters at the destination buffer or -E2BIG if
* the string was too big to fit.
*/
static inline size_t strscat(char *dst, const char *src, size_t dsize)
{
int i, rc;
for (i = 0; dsize > 0; dsize--, dst++, i++)
if (!*dst)
break;
rc = strscpy(dst, src, dsize);
if (rc < 0)
return rc;
return rc + i;
}
/**
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.
* @type: the type of the container struct this is embedded in.
* @member: the name of the member within the struct.
*
* WARNING: any const qualifier of @ptr is lost.
*/
#define container_of(ptr, type, member) ({ \
void *__mptr = (void *)(ptr); \
static_assert(__same_type(*(ptr), ((type *)0)->member) || \
__same_type(*(ptr), void), \
"pointer type mismatch in container_of()"); \
((type *)(__mptr - offsetof(type, member))); })
#define LOGLEVEL_DEFAULT -1 /* default (or last) loglevel */
#define LOGLEVEL_EMERG 0 /* system is unusable */
#define LOGLEVEL_ALERT 1 /* action must be taken immediately */
#define LOGLEVEL_CRIT 2 /* critical conditions */
#define LOGLEVEL_ERR 3 /* error conditions */
#define LOGLEVEL_WARNING 4 /* warning conditions */
#define LOGLEVEL_NOTICE 5 /* normal but significant condition */
#define LOGLEVEL_INFO 6 /* informational */
#define LOGLEVEL_DEBUG 7 /* debug-level messages */
extern const char *loglevel_str[];
#endif
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