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unplugged-system/external/libnl/include/netlink-private/utils.h

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/* SPDX-License-Identifier: LGPL-2.1-only */
/*
* Copyright (c) 2003-2012 Thomas Graf <tgraf@suug.ch>
*/
#ifndef NETLINK_UTILS_PRIV_H_
#define NETLINK_UTILS_PRIV_H_
#include <byteswap.h>
#include <assert.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdbool.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#if __BYTE_ORDER == __BIG_ENDIAN
#define ntohll(x) (x)
#elif __BYTE_ORDER == __LITTLE_ENDIAN
#define ntohll(x) bswap_64((x))
#endif
#define htonll(x) ntohll(x)
/*****************************************************************************/
#define _NL_STRINGIFY_ARG(contents) #contents
#define _NL_STRINGIFY(macro_or_string) _NL_STRINGIFY_ARG (macro_or_string)
/*****************************************************************************/
#if defined (__GNUC__)
#define _NL_PRAGMA_WARNING_DO(warning) _NL_STRINGIFY(GCC diagnostic ignored warning)
#elif defined (__clang__)
#define _NL_PRAGMA_WARNING_DO(warning) _NL_STRINGIFY(clang diagnostic ignored warning)
#endif
/* you can only suppress a specific warning that the compiler
* understands. Otherwise you will get another compiler warning
* about invalid pragma option.
* It's not that bad however, because gcc and clang often have the
* same name for the same warning. */
#if defined (__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
#define _NL_PRAGMA_WARNING_DISABLE(warning) \
_Pragma("GCC diagnostic push") \
_Pragma(_NL_PRAGMA_WARNING_DO("-Wpragmas")) \
_Pragma(_NL_PRAGMA_WARNING_DO(warning))
#elif defined (__clang__)
#define _NL_PRAGMA_WARNING_DISABLE(warning) \
_Pragma("clang diagnostic push") \
_Pragma(_NL_PRAGMA_WARNING_DO("-Wunknown-warning-option")) \
_Pragma(_NL_PRAGMA_WARNING_DO(warning))
#else
#define _NL_PRAGMA_WARNING_DISABLE(warning)
#endif
#if defined (__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))
#define _NL_PRAGMA_WARNING_REENABLE \
_Pragma("GCC diagnostic pop")
#elif defined (__clang__)
#define _NL_PRAGMA_WARNING_REENABLE \
_Pragma("clang diagnostic pop")
#else
#define _NL_PRAGMA_WARNING_REENABLE
#endif
/*****************************************************************************/
#define _nl_unused __attribute__ ((__unused__))
#define _nl_auto(fcn) __attribute__ ((__cleanup__(fcn)))
/*****************************************************************************/
#ifdef thread_local
#define _nl_thread_local thread_local
/*
* Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
*/
#elif __STDC_VERSION__ >= 201112L && \
!(defined(__STDC_NO_THREADS__) || \
(defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && \
__GLIBC_MINOR__ < 16))
#define _nl_thread_local _Thread_local
#else
#define _nl_thread_local __thread
#endif
/*****************************************************************************/
#define _NL_STATIC_ASSERT(cond) ((void) sizeof (char[(cond) ? 1 : -1]))
/*****************************************************************************/
#if defined(NL_MORE_ASSERTS) && NL_MORE_ASSERTS > 0
#define _nl_assert(cond) assert(cond)
#else
#define _nl_assert(cond) do { if (0) { assert(cond); } } while (0)
#endif
#define _nl_assert_not_reached() assert(0)
/*****************************************************************************/
#define _nl_assert_addr_family_or_unspec(addr_family) \
do { \
typeof(addr_family) _addr_family = (addr_family); \
\
_nl_assert(_addr_family == AF_UNSPEC || \
_addr_family == AF_INET || \
_addr_family == AF_INET6); \
} while (0)
#define _nl_assert_addr_family(addr_family) \
do { \
typeof(addr_family) _addr_family = (addr_family); \
\
_nl_assert(_addr_family == AF_INET || \
_addr_family == AF_INET6); \
} while (0)
/*****************************************************************************/
#define _NL_SWAP(pa, pb) \
do { \
typeof(*(pa)) *_pa = (pa); \
typeof(*(pb)) *_pb = (pb); \
typeof(*_pa) _tmp; \
\
_nl_assert(_pa); \
_nl_assert(_pb); \
_tmp = *_pa; \
*_pa = *_pb; \
*_pb = _tmp; \
} while (0)
/*****************************************************************************/
#define _NL_N_ELEMENTS(arr) (sizeof(arr) / sizeof((arr)[0]))
/*****************************************************************************/
extern const char *nl_strerror_l(int err);
/*****************************************************************************/
/* internal macro to calculate the size of a struct @type up to (and including) @field.
* this will be used for .minlen policy fields, so that we require only a field of up
* to the given size. */
#define _nl_offsetofend(type, field) (offsetof (type, field) + sizeof (((type *) NULL)->field))
/*****************************************************************************/
#define _nl_clear_pointer(pp, destroy) \
({ \
__typeof__ (*(pp)) *_pp = (pp); \
__typeof__ (*_pp) _p; \
int _changed = 0; \
\
if ( _pp \
&& (_p = *_pp)) { \
_nl_unused const void *const _p_check_is_pointer = _p; \
\
*_pp = NULL; \
\
(destroy) (_p); \
\
_changed = 1; \
} \
_changed; \
})
#define _nl_clear_free(pp) _nl_clear_pointer (pp, free)
#define _nl_steal_pointer(pp) \
({ \
__typeof__ (*(pp)) *const _pp = (pp); \
__typeof__ (*_pp) _p = NULL; \
\
if ( _pp \
&& (_p = *_pp)) { \
*_pp = NULL; \
} \
\
_p; \
})
/*****************************************************************************/
#define _nl_malloc_maybe_a(alloca_maxlen, bytes, to_free) \
({ \
const size_t _bytes = (bytes); \
__typeof__ (to_free) _to_free = (to_free); \
__typeof__ (*_to_free) _ptr; \
\
_NL_STATIC_ASSERT ((alloca_maxlen) <= 500); \
_nl_assert (_to_free && !*_to_free); \
\
if (_bytes <= (alloca_maxlen)) { \
_ptr = alloca (_bytes); \
} else { \
_ptr = malloc (_bytes); \
*_to_free = _ptr; \
}; \
\
_ptr; \
})
/*****************************************************************************/
static inline bool _nl_streq(const char *a, const char *b)
{
return !strcmp(a, b);
}
static inline bool _nl_streq0(const char *a, const char *b)
{
return a == b || (a && b && _nl_streq(a, b));
}
static inline char *
_nl_strncpy_trunc(char *dst, const char *src, size_t len)
{
/* we don't use/reimplement strlcpy(), because we want the fill-all-with-NUL
* behavior of strncpy(). This is just strncpy() with gracefully handling truncation
* (and disabling the "-Wstringop-truncation" warning).
*
* Note that truncation is silently accepted.
*/
_NL_PRAGMA_WARNING_DISABLE ("-Wstringop-truncation");
_NL_PRAGMA_WARNING_DISABLE ("-Wstringop-overflow");
if (len > 0) {
_nl_assert(dst);
_nl_assert(src);
strncpy(dst, src, len);
dst[len - 1] = '\0';
}
_NL_PRAGMA_WARNING_REENABLE;
_NL_PRAGMA_WARNING_REENABLE;
return dst;
}
static inline char *
_nl_strncpy_assert(char *dst, const char *src, size_t len)
{
/* we don't use/reimplement strlcpy(), because we want the fill-all-with-NUL
* behavior of strncpy(). This is just strncpy() with assertion against truncation
* (and disabling the "-Wstringop-truncation" warning).
*
* Note that truncation is still a bug and there is an _nl_assert()
* against that.
*/
_NL_PRAGMA_WARNING_DISABLE ("-Wstringop-truncation");
_NL_PRAGMA_WARNING_DISABLE ("-Wstringop-overflow");
if (len > 0) {
_nl_assert(dst);
_nl_assert(src);
strncpy(dst, src, len);
_nl_assert (dst[len - 1] == '\0');
dst[len - 1] = '\0';
}
_NL_PRAGMA_WARNING_REENABLE;
_NL_PRAGMA_WARNING_REENABLE;
return dst;
}
#include "nl-auto.h"
#define _NL_RETURN_ON_ERR(cmd) \
do { \
int _err; \
\
_err = (cmd); \
if (_err < 0) \
return _err; \
} while (0)
#define _NL_RETURN_E_ON_ERR(e, cmd) \
do { \
int _err; \
\
_err = (cmd); \
if (_err < 0) { \
_NL_STATIC_ASSERT((e) > 0); \
return -(e); \
} \
} while (0)
/* _NL_RETURN_ON_PUT_ERR() shall only be used with a put command (nla_put or nlmsg_append).
* These commands can either fail with a regular error code (which gets propagated)
* or with -NLE_NOMEM. However, they don't really try to allocate memory, so we don't
* want to propagate -NLE_NOMEM. Instead, we coerce such failure to -NLE_MSGSIZE. */
#define _NL_RETURN_ON_PUT_ERR(put_cmd) \
do { \
int _err; \
\
_err = (put_cmd); \
if (_err < 0) { \
if (_err == -NLE_NOMEM) { \
/* nla_put() returns -NLE_NOMEM in case of out of buffer size. We don't
* want to propagate that error and map it to -NLE_MSGSIZE. */ \
return -NLE_MSGSIZE; \
} \
/* any other error can only be due to invalid parameters. Propagate the
* error, however also assert that it cannot be reached. */ \
_nl_assert_not_reached (); \
return _err; \
} else \
_nl_assert (_err == 0); \
} while (0)
static inline int
_nl_close(int fd)
{
int r;
r = close(fd);
_nl_assert(r == 0 || fd < 0 || errno != EBADF);
return r;
}
static inline void *
_nl_memdup(const void *ptr, size_t len)
{
void *p;
if (len == 0) {
/* malloc() leaves it implementation defined whether to return NULL.
* Callers rely on returning NULL if len is zero. */
return NULL;
}
p = malloc(len);
if (!p)
return NULL;
memcpy(p, ptr, len);
return p;
}
#define _nl_memdup_ptr(ptr) ((__typeof__(ptr)) _nl_memdup((ptr), sizeof(*(ptr))))
/*****************************************************************************/
typedef union {
in_addr_t addr4;
struct in_addr a4;
struct in6_addr a6;
} _NLIPAddr;
static inline char *_nl_inet_ntop(int addr_family, const void *addr,
char buf[static INET_ADDRSTRLEN])
{
char *r;
_nl_assert_addr_family(addr_family);
_nl_assert(addr);
/* inet_ntop() is documented to fail, but if we pass a known address family
* and a suitably large buffer, it cannot. Assert for that. */
r = (char *)inet_ntop(addr_family, addr, buf,
(addr_family == AF_INET) ? INET_ADDRSTRLEN :
INET6_ADDRSTRLEN);
_nl_assert(r == buf);
_nl_assert(strlen(r) < ((addr_family == AF_INET) ? INET_ADDRSTRLEN :
INET6_ADDRSTRLEN));
return r;
}
static inline char *_nl_inet_ntop_dup(int addr_family, const void *addr)
{
return (char *)_nl_inet_ntop(addr_family, addr,
malloc((addr_family == AF_INET) ?
INET_ADDRSTRLEN :
INET6_ADDRSTRLEN));
}
#endif
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