2 * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
31 #define va_copy __va_copy
33 #define va_copy(dst, src) ((dst) = (src))
38 #define BUILD_ASSERT(EXPR) ((void) 0)
39 #define BUILD_ASSERT_DECL(EXPR) extern int (*build_assert(void))[1]
40 #elif !defined(__cplusplus)
41 /* Build-time assertion building block. */
42 #define BUILD_ASSERT__(EXPR) \
43 sizeof(struct { unsigned int build_assert_failed : (EXPR) ? 1 : -1; })
45 /* Build-time assertion for use in a statement context. */
46 #define BUILD_ASSERT(EXPR) (void) BUILD_ASSERT__(EXPR)
48 /* Build-time assertion for use in a declaration context. */
49 #define BUILD_ASSERT_DECL(EXPR) \
50 extern int (*build_assert(void))[BUILD_ASSERT__(EXPR)]
51 #else /* __cplusplus */
52 #include <boost/static_assert.hpp>
53 #define BUILD_ASSERT BOOST_STATIC_ASSERT
54 #define BUILD_ASSERT_DECL BOOST_STATIC_ASSERT
55 #endif /* __cplusplus */
58 #define BUILD_ASSERT_GCCONLY(EXPR) BUILD_ASSERT(EXPR)
59 #define BUILD_ASSERT_DECL_GCCONLY(EXPR) BUILD_ASSERT_DECL(EXPR)
61 #define BUILD_ASSERT_GCCONLY(EXPR) ((void) 0)
62 #define BUILD_ASSERT_DECL_GCCONLY(EXPR) ((void) 0)
65 /* Like the standard assert macro, except:
67 * - Writes the failure message to the log.
69 * - Not affected by NDEBUG. */
70 #define ovs_assert(CONDITION) \
71 if (!OVS_LIKELY(CONDITION)) { \
72 ovs_assert_failure(SOURCE_LOCATOR, __func__, #CONDITION); \
74 void ovs_assert_failure(const char *, const char *, const char *) NO_RETURN;
76 /* Casts 'pointer' to 'type' and issues a compiler warning if the cast changes
77 * anything other than an outermost "const" or "volatile" qualifier.
79 * The cast to int is present only to suppress an "expression using sizeof
80 * bool" warning from "sparse" (see
81 * http://permalink.gmane.org/gmane.comp.parsers.sparse/2967). */
82 #define CONST_CAST(TYPE, POINTER) \
83 ((void) sizeof ((int) ((POINTER) == (TYPE) (POINTER))), \
86 extern const char *program_name;
87 extern const char *subprogram_name;
89 /* Returns the number of elements in ARRAY. */
90 #define ARRAY_SIZE(ARRAY) (sizeof ARRAY / sizeof *ARRAY)
92 /* Returns X / Y, rounding up. X must be nonnegative to round correctly. */
93 #define DIV_ROUND_UP(X, Y) (((X) + ((Y) - 1)) / (Y))
95 /* Returns X rounded up to the nearest multiple of Y. */
96 #define ROUND_UP(X, Y) (DIV_ROUND_UP(X, Y) * (Y))
98 /* Returns X rounded down to the nearest multiple of Y. */
99 #define ROUND_DOWN(X, Y) ((X) / (Y) * (Y))
101 /* Returns true if X is a power of 2, otherwise false. */
102 #define IS_POW2(X) ((X) && !((X) & ((X) - 1)))
111 #define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
115 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
118 #define NOT_REACHED() abort()
120 /* Expands to a string that looks like "<file>:<line>", e.g. "tmp.c:10".
122 * See http://c-faq.com/ansi/stringize.html for an explanation of STRINGIZE and
124 #define SOURCE_LOCATOR __FILE__ ":" STRINGIZE(__LINE__)
125 #define STRINGIZE(ARG) STRINGIZE2(ARG)
126 #define STRINGIZE2(ARG) #ARG
128 /* Given a pointer-typed lvalue OBJECT, expands to a pointer type that may be
129 * assigned to OBJECT. */
131 #define OVS_TYPEOF(OBJECT) typeof(OBJECT)
133 #define OVS_TYPEOF(OBJECT) void *
136 /* Given OBJECT of type pointer-to-structure, expands to the offset of MEMBER
137 * within an instance of the structure.
139 * The GCC-specific version avoids the technicality of undefined behavior if
140 * OBJECT is null, invalid, or not yet initialized. This makes some static
141 * checkers (like Coverity) happier. But the non-GCC version does not actually
142 * dereference any pointer, so it would be surprising for it to cause any
143 * problems in practice.
146 #define OBJECT_OFFSETOF(OBJECT, MEMBER) offsetof(typeof(*(OBJECT)), MEMBER)
148 #define OBJECT_OFFSETOF(OBJECT, MEMBER) \
149 ((char *) &(OBJECT)->MEMBER - (char *) (OBJECT))
152 /* Given POINTER, the address of the given MEMBER in a STRUCT object, returns
153 the STRUCT object. */
154 #define CONTAINER_OF(POINTER, STRUCT, MEMBER) \
155 ((STRUCT *) (void *) ((char *) (POINTER) - offsetof (STRUCT, MEMBER)))
157 /* Given POINTER, the address of the given MEMBER within an object of the type
158 * that that OBJECT points to, returns OBJECT as an assignment-compatible
159 * pointer type (either the correct pointer type or "void *"). OBJECT must be
162 * This is the same as CONTAINER_OF except that it infers the structure type
163 * from the type of '*OBJECT'. */
164 #define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \
165 ((OVS_TYPEOF(OBJECT)) (void *) \
166 ((char *) (POINTER) - OBJECT_OFFSETOF(OBJECT, MEMBER)))
168 /* Given POINTER, the address of the given MEMBER within an object of the type
169 * that that OBJECT points to, assigns the address of the outer object to
170 * OBJECT, which must be an lvalue.
173 #define ASSIGN_CONTAINER(OBJECT, POINTER, MEMBER) \
174 ((OBJECT) = OBJECT_CONTAINING(POINTER, OBJECT, MEMBER), 1)
180 void set_program_name__(const char *name, const char *version,
181 const char *date, const char *time);
182 #define set_program_name(name) \
183 set_program_name__(name, VERSION, __DATE__, __TIME__)
185 const char *get_program_version(void);
186 void ovs_print_version(uint8_t min_ofp, uint8_t max_ofp);
188 void out_of_memory(void) NO_RETURN;
189 void *xmalloc(size_t) MALLOC_LIKE;
190 void *xcalloc(size_t, size_t) MALLOC_LIKE;
191 void *xzalloc(size_t) MALLOC_LIKE;
192 void *xrealloc(void *, size_t);
193 void *xmemdup(const void *, size_t) MALLOC_LIKE;
194 char *xmemdup0(const char *, size_t) MALLOC_LIKE;
195 char *xstrdup(const char *) MALLOC_LIKE;
196 char *xasprintf(const char *format, ...) PRINTF_FORMAT(1, 2) MALLOC_LIKE;
197 char *xvasprintf(const char *format, va_list) PRINTF_FORMAT(1, 0) MALLOC_LIKE;
198 void *x2nrealloc(void *p, size_t *n, size_t s);
200 void ovs_strlcpy(char *dst, const char *src, size_t size);
201 void ovs_strzcpy(char *dst, const char *src, size_t size);
203 void ovs_abort(int err_no, const char *format, ...)
204 PRINTF_FORMAT(2, 3) NO_RETURN;
205 void ovs_abort_valist(int err_no, const char *format, va_list)
206 PRINTF_FORMAT(2, 0) NO_RETURN;
207 void ovs_fatal(int err_no, const char *format, ...)
208 PRINTF_FORMAT(2, 3) NO_RETURN;
209 void ovs_fatal_valist(int err_no, const char *format, va_list)
210 PRINTF_FORMAT(2, 0) NO_RETURN;
211 void ovs_error(int err_no, const char *format, ...) PRINTF_FORMAT(2, 3);
212 void ovs_error_valist(int err_no, const char *format, va_list)
214 const char *ovs_retval_to_string(int);
215 void ovs_hex_dump(FILE *, const void *, size_t, uintptr_t offset, bool ascii);
217 bool str_to_int(const char *, int base, int *);
218 bool str_to_long(const char *, int base, long *);
219 bool str_to_llong(const char *, int base, long long *);
220 bool str_to_uint(const char *, int base, unsigned int *);
221 bool str_to_ulong(const char *, int base, unsigned long *);
222 bool str_to_ullong(const char *, int base, unsigned long long *);
224 bool str_to_double(const char *, double *);
226 int hexit_value(int c);
227 unsigned int hexits_value(const char *s, size_t n, bool *ok);
229 const char *english_list_delimiter(size_t index, size_t total);
232 char *dir_name(const char *file_name);
233 char *base_name(const char *file_name);
234 char *abs_file_name(const char *dir, const char *file_name);
236 char *xreadlink(const char *filename);
237 char *follow_symlinks(const char *filename);
239 void ignore(bool x OVS_UNUSED);
243 /* Returns the number of trailing 0-bits in 'n'. Undefined if 'n' == 0.
245 * This compiles to a single machine instruction ("bsf") with GCC on x86. */
246 #if !defined(UINT_MAX) || !defined(UINT32_MAX)
247 #error "Someone screwed up the #includes."
248 #elif __GNUC__ >= 4 && UINT_MAX == UINT32_MAX
252 return __builtin_ctz(n);
255 /* Defined in util.c. */
256 int raw_ctz(uint32_t n);
259 /* Returns the number of trailing 0-bits in 'n', or 32 if 'n' is 0. */
263 return n ? raw_ctz(n) : 32;
266 int log_2_floor(uint32_t);
267 int log_2_ceil(uint32_t);
268 int popcount(uint32_t);
270 /* Returns the rightmost 1-bit in 'x' (e.g. 01011000 => 00001000), or 0 if 'x'
272 static inline uintmax_t
273 rightmost_1bit(uintmax_t x)
278 /* Returns 'x' with its rightmost 1-bit changed to a zero (e.g. 01011000 =>
279 * 01010000), or 0 if 'x' is 0. */
280 static inline uintmax_t
281 zero_rightmost_1bit(uintmax_t x)
286 /* Returns the index of the rightmost 1-bit in 'x' (e.g. 01011000 => 3), or 32
289 * Unlike the other functions for rightmost 1-bits, this function only works
290 * with 32-bit integers. */
291 static inline uint32_t
292 rightmost_1bit_idx(uint32_t x)
294 return x ? ctz(x) : 32;
297 /* Returns the index of the rightmost 1-bit in 'x' (e.g. 01011000 => 6), or 32
300 * This function only works with 32-bit integers. */
301 static inline uint32_t
302 leftmost_1bit_idx(uint32_t x)
304 return x ? log_2_floor(x) : 32;
307 bool is_all_zeros(const uint8_t *, size_t);
308 bool is_all_ones(const uint8_t *, size_t);
309 void bitwise_copy(const void *src, unsigned int src_len, unsigned int src_ofs,
310 void *dst, unsigned int dst_len, unsigned int dst_ofs,
311 unsigned int n_bits);
312 void bitwise_zero(void *dst_, unsigned int dst_len, unsigned dst_ofs,
313 unsigned int n_bits);
314 void bitwise_one(void *dst_, unsigned int dst_len, unsigned dst_ofs,
315 unsigned int n_bits);
316 bool bitwise_is_all_zeros(const void *, unsigned int len, unsigned int ofs,
317 unsigned int n_bits);
318 void bitwise_put(uint64_t value,
319 void *dst, unsigned int dst_len, unsigned int dst_ofs,
320 unsigned int n_bits);
321 uint64_t bitwise_get(const void *src, unsigned int src_len,
322 unsigned int src_ofs, unsigned int n_bits);