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shl: update shl-macro.h

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Fix a bug in SHL_ALIGN_POWER2 and add new shl_closep helpers.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
This commit is contained in:
David Herrmann 2014-05-12 14:32:41 +02:00
parent 5c88e3df66
commit 3dcb89e98b
1 changed files with 18 additions and 2 deletions
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20
src/shared/shl_macro.h
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@ -1,7 +1,7 @@
/*
* SHL - Macros
*
* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
* Copyright (c) 2011-2014 David Herrmann <dh.herrmann@gmail.com>
* Dedicated to the Public Domain
*/
@ -18,6 +18,7 @@
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* sanity checks required for some macros */
#if __SIZEOF_POINTER__ != 4 && __SIZEOF_POINTER__ != 8
@ -50,6 +51,14 @@ static inline void shl_freep(void *p)
#define _shl_free_ _shl_cleanup_(shl_freep)
static inline void shl_closep(int *p)
{
if (*p >= 0)
close(*p);
}
#define _shl_close_ _shl_cleanup_(shl_closep)
static inline void shl_set_errno(int *r)
{
errno = *r;
@ -127,7 +136,14 @@ static inline void shl_set_errno(int *r)
/* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
static inline size_t SHL_ALIGN_POWER2(size_t u)
{
return 1ULL << ((sizeof(u) * 8ULL) - __builtin_clzll(u - 1ULL));
unsigned int shift;
/* clz(0) is undefined */
if (u == 1)
return 1;
shift = sizeof(unsigned long long) * 8ULL - __builtin_clzll(u - 1ULL);
return 1ULL << shift;
}
/* zero memory or type */