mirror of
https://github.com/jb55/nostril.git
synced 2024-11-21 16:29:06 -05:00
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
|
|
#ifndef COMPILER_H
|
|
#define COMPILER_H
|
|
|
|
#include <stdbool.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "config.h"
|
|
|
|
#if HAVE_UNALIGNED_ACCESS
|
|
#define alignment_ok(p, n) 1
|
|
#else
|
|
#define alignment_ok(p, n) ((size_t)(p) % (n) == 0)
|
|
#endif
|
|
|
|
#define UNUSED __attribute__((__unused__))
|
|
|
|
/**
|
|
* BUILD_ASSERT - assert a build-time dependency.
|
|
* @cond: the compile-time condition which must be true.
|
|
*
|
|
* Your compile will fail if the condition isn't true, or can't be evaluated
|
|
* by the compiler. This can only be used within a function.
|
|
*
|
|
* Example:
|
|
* #include <stddef.h>
|
|
* ...
|
|
* static char *foo_to_char(struct foo *foo)
|
|
* {
|
|
* // This code needs string to be at start of foo.
|
|
* BUILD_ASSERT(offsetof(struct foo, string) == 0);
|
|
* return (char *)foo;
|
|
* }
|
|
*/
|
|
#define BUILD_ASSERT(cond) \
|
|
do { (void) sizeof(char [1 - 2*!(cond)]); } while(0)
|
|
|
|
/**
|
|
* BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
|
|
* @cond: the compile-time condition which must be true.
|
|
*
|
|
* Your compile will fail if the condition isn't true, or can't be evaluated
|
|
* by the compiler. This can be used in an expression: its value is "0".
|
|
*
|
|
* Example:
|
|
* #define foo_to_char(foo) \
|
|
* ((char *)(foo) \
|
|
* + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
|
|
*/
|
|
#define BUILD_ASSERT_OR_ZERO(cond) \
|
|
(sizeof(char [1 - 2*!(cond)]) - 1)
|
|
|
|
#define memclear(mem, size) memset(mem, 0, size)
|
|
#define memclear_2(m1, s1, m2, s2) { memclear(m1, s1); memclear(m2, s2); }
|
|
#define memclear_3(m1, s1, m2, s2, m3, s3) { memclear(m1, s1); memclear(m2, s2); memclear(m3, s3); }
|
|
|
|
static inline void *memcheck_(const void *data, size_t len)
|
|
{
|
|
(void)len;
|
|
return (void *)data;
|
|
}
|
|
|
|
#if HAVE_TYPEOF
|
|
/**
|
|
* memcheck - check that a memory region is initialized
|
|
* @data: start of region
|
|
* @len: length in bytes
|
|
*
|
|
* When running under valgrind, this causes an error to be printed
|
|
* if the entire region is not defined. Otherwise valgrind only
|
|
* reports an error when an undefined value is used for a branch, or
|
|
* written out.
|
|
*
|
|
* Example:
|
|
* // Search for space, but make sure it's all initialized.
|
|
* if (memchr(memcheck(somebytes, bytes_len), ' ', bytes_len)) {
|
|
* printf("space was found!\n");
|
|
* }
|
|
*/
|
|
#define memcheck(data, len) ((__typeof__((data)+0))memcheck_((data), (len)))
|
|
#else
|
|
#define memcheck(data, len) memcheck_((data), (len))
|
|
#endif
|
|
|
|
#endif /* COMPILER_H */
|