X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Futil.h;h=9318fa7274a0f30b98dbf307a7abef348b35a7a9;hb=27527aa09ce456796eeea728cef9528aa5612b70;hp=f3bf80c6eaeddc760344b743bb30785d2258b985;hpb=c18ea70d06e980dc768166881c5aeac0b3491561;p=sliver-openvswitch.git diff --git a/lib/util.h b/lib/util.h index f3bf80c6e..9318fa727 100644 --- a/lib/util.h +++ b/lib/util.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2008, 2009, 2010 Nicira Networks. + * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira Networks. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -33,7 +33,10 @@ #endif #endif -#ifndef __cplusplus +#ifdef __CHECKER__ +#define BUILD_ASSERT(EXPR) ((void) 0) +#define BUILD_ASSERT_DECL(EXPR) extern int (*build_assert(void))[1] +#elif !defined(__cplusplus) /* Build-time assertion building block. */ #define BUILD_ASSERT__(EXPR) \ sizeof(struct { unsigned int build_assert_failed : (EXPR) ? 1 : -1; }) @@ -50,6 +53,14 @@ #define BUILD_ASSERT_DECL BOOST_STATIC_ASSERT #endif /* __cplusplus */ +#ifdef __GNUC__ +#define BUILD_ASSERT_GCCONLY(EXPR) BUILD_ASSERT(EXPR) +#define BUILD_ASSERT_DECL_GCCONLY(EXPR) BUILD_ASSERT_DECL(EXPR) +#else +#define BUILD_ASSERT_GCCONLY(EXPR) ((void) 0) +#define BUILD_ASSERT_DECL_GCCONLY(EXPR) ((void) 0) +#endif + extern const char *program_name; /* Returns the number of elements in ARRAY. */ @@ -67,6 +78,20 @@ extern const char *program_name; /* Returns true if X is a power of 2, otherwise false. */ #define IS_POW2(X) ((X) && !((X) & ((X) - 1))) +static inline bool +is_pow2(uintmax_t x) +{ + return IS_POW2(x); +} + +/* Returns the rightmost 1-bit in 'x' (e.g. 01011000 => 00001000), or 0 if 'x' + * is 0. */ +static inline uintmax_t +rightmost_1bit(uintmax_t x) +{ + return x & -x; +} + #ifndef MIN #define MIN(X, Y) ((X) < (Y) ? (X) : (Y)) #endif @@ -77,6 +102,14 @@ extern const char *program_name; #define NOT_REACHED() abort() +/* Expands to a string that looks like ":", e.g. "tmp.c:10". + * + * See http://c-faq.com/ansi/stringize.html for an explanation of STRINGIZE and + * STRINGIZE2. */ +#define SOURCE_LOCATOR __FILE__ ":" STRINGIZE(__LINE__) +#define STRINGIZE(ARG) STRINGIZE2(ARG) +#define STRINGIZE2(ARG) #ARG + /* Given a pointer-typed lvalue OBJECT, expands to a pointer type that may be * assigned to OBJECT. */ #ifdef __GNUC__ @@ -85,6 +118,22 @@ extern const char *program_name; #define OVS_TYPEOF(OBJECT) void * #endif +/* Given OBJECT of type pointer-to-structure, expands to the offset of MEMBER + * within an instance of the structure. + * + * The GCC-specific version avoids the technicality of undefined behavior if + * OBJECT is null, invalid, or not yet initialized. This makes some static + * checkers (like Coverity) happier. But the non-GCC version does not actually + * dereference any pointer, so it would be surprising for it to cause any + * problems in practice. + */ +#ifdef __GNUC__ +#define OBJECT_OFFSETOF(OBJECT, MEMBER) offsetof(typeof(*(OBJECT)), MEMBER) +#else +#define OBJECT_OFFSETOF(OBJECT, MEMBER) \ + ((char *) &(OBJECT)->MEMBER - (char *) (OBJECT)) +#endif + /* Given POINTER, the address of the given MEMBER in a STRUCT object, returns the STRUCT object. */ #define CONTAINER_OF(POINTER, STRUCT, MEMBER) \ @@ -99,7 +148,7 @@ extern const char *program_name; * from the type of '*OBJECT'. */ #define OBJECT_CONTAINING(POINTER, OBJECT, MEMBER) \ ((OVS_TYPEOF(OBJECT)) (void *) \ - ((char *) (POINTER) - ((char *) &(OBJECT)->MEMBER - (char *) (OBJECT)))) + ((char *) (POINTER) - OBJECT_OFFSETOF(OBJECT, MEMBER))) /* Given POINTER, the address of the given MEMBER within an object of the type * that that OBJECT points to, assigns the address of the outer object to @@ -113,12 +162,12 @@ extern const char *program_name; extern "C" { #endif -void set_program_name(const char *); +void set_program_name__(const char *name, const char *date, const char *time); +#define set_program_name(name) \ + set_program_name__(name, __DATE__, __TIME__) -void ovs_print_version(char *date, char *time, - uint8_t min_ofp, uint8_t max_ofp); -#define OVS_PRINT_VERSION(min_ofp, max_ofp) \ - ovs_print_version(__DATE__, __TIME__, (min_ofp), (max_ofp)) +const char *get_program_version(void); +void ovs_print_version(uint8_t min_ofp, uint8_t max_ofp); void out_of_memory(void) NO_RETURN; void *xmalloc(size_t) MALLOC_LIKE; @@ -133,10 +182,17 @@ char *xvasprintf(const char *format, va_list) PRINTF_FORMAT(1, 0) MALLOC_LIKE; void *x2nrealloc(void *p, size_t *n, size_t s); void ovs_strlcpy(char *dst, const char *src, size_t size); +void ovs_strzcpy(char *dst, const char *src, size_t size); +void ovs_abort(int err_no, const char *format, ...) + PRINTF_FORMAT(2, 3) NO_RETURN; void ovs_fatal(int err_no, const char *format, ...) PRINTF_FORMAT(2, 3) NO_RETURN; +void ovs_fatal_valist(int err_no, const char *format, va_list) + PRINTF_FORMAT(2, 0) NO_RETURN; void ovs_error(int err_no, const char *format, ...) PRINTF_FORMAT(2, 3); +void ovs_error_valist(int err_no, const char *format, va_list) + PRINTF_FORMAT(2, 0); const char *ovs_retval_to_string(int); void ovs_hex_dump(FILE *, const void *, size_t, uintptr_t offset, bool ascii); @@ -152,12 +208,30 @@ bool str_to_double(const char *, double *); int hexit_value(int c); unsigned int hexits_value(const char *s, size_t n, bool *ok); +const char *english_list_delimiter(size_t index, size_t total); + char *get_cwd(void); char *dir_name(const char *file_name); char *base_name(const char *file_name); char *abs_file_name(const char *dir, const char *file_name); void ignore(bool x OVS_UNUSED); +int log_2_floor(uint32_t); +int log_2_ceil(uint32_t); +int ctz(uint32_t); + +bool is_all_zeros(const uint8_t *, size_t); +bool is_all_ones(const uint8_t *, size_t); +void bitwise_copy(const void *src, unsigned int src_len, unsigned int src_ofs, + void *dst, unsigned int dst_len, unsigned int dst_ofs, + unsigned int n_bits); +void bitwise_zero(void *dst_, unsigned int dst_len, unsigned dst_ofs, + unsigned int n_bits); +void bitwise_put(uint64_t value, + void *dst, unsigned int dst_len, unsigned int dst_ofs, + unsigned int n_bits); +uint64_t bitwise_get(const void *src, unsigned int src_len, + unsigned int src_ofs, unsigned int n_bits); #ifdef __cplusplus }