/* * This file Copyright (C) 2009-2014 Mnemosyne LLC * * It may be used under the GNU GPL versions 2 or 3 * or any future license endorsed by Mnemosyne LLC. * * $Id$ */ #ifndef TR_UTILS_H #define TR_UTILS_H 1 #include #include #include /* size_t */ #include /* time_t */ #ifdef __cplusplus extern "C" { #endif /*** **** ***/ /** * @addtogroup utils Utilities * @{ */ #ifndef UNUSED #ifdef __GNUC__ #define UNUSED __attribute__ ((unused)) #else #define UNUSED #endif #endif #ifndef TR_GNUC_PRINTF #ifdef __GNUC__ #define TR_GNUC_PRINTF(fmt, args) __attribute__ ((format (printf, fmt, args))) #else #define TR_GNUC_PRINTF(fmt, args) #endif #endif #ifndef TR_GNUC_NONNULL #ifdef __GNUC__ #define TR_GNUC_NONNULL(...) __attribute__ ((nonnull (__VA_ARGS__))) #else #define TR_GNUC_NONNULL(...) #endif #endif #ifndef TR_GNUC_NULL_TERMINATED #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) #define TR_GNUC_NULL_TERMINATED __attribute__ ((__sentinel__)) #define TR_GNUC_HOT __attribute ((hot)) #else #define TR_GNUC_NULL_TERMINATED #define TR_GNUC_HOT #endif #endif #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) #define TR_GNUC_MALLOC __attribute__ ((__malloc__)) #else #define TR_GNUC_MALLOC #endif #ifndef __has_feature #define __has_feature(x) 0 #endif #ifndef __has_extension #define __has_extension __has_feature #endif /** * @def TR_STATIC_ASSERT * @brief This helper allows to perform static checks at compile time */ #if defined (static_assert) #define TR_STATIC_ASSERT static_assert #elif __has_feature (c_static_assert) || __has_extension (c_static_assert) #define TR_STATIC_ASSERT _Static_assert #else #define TR_STATIC_ASSERT(x, msg) { const char static_check[((x) ? 1 : -1)] UNUSED; } #endif /*** **** ***/ const char * tr_strip_positional_args (const char * fmt); #if !defined (_) #if defined (HAVE_LIBINTL_H) && !defined (__APPLE__) #include #define _(a) gettext (a) #else #define _(a)(a) #endif #endif /* #define DISABLE_GETTEXT */ #ifndef DISABLE_GETTEXT #if defined (_WIN32) || defined (TR_LIGHTWEIGHT) #define DISABLE_GETTEXT #endif #endif #ifdef DISABLE_GETTEXT #undef _ #define _(a) tr_strip_positional_args (a) #endif /**** ***** ****/ /** * @brief Rich Salz's classic implementation of shell-style pattern matching for ?, \, [], and * characters. * @return 1 if the pattern matches, 0 if it doesn't, or -1 if an error occured */ bool tr_wildmat (const char * text, const char * pattern) TR_GNUC_NONNULL (1,2); /** * @brief Loads a file and returns its contents. * On failure, NULL is returned and errno is set. */ uint8_t* tr_loadFile (const char * filename, size_t * size) TR_GNUC_MALLOC TR_GNUC_NONNULL (1); /** @brief build a filename from a series of elements using the platform's correct directory separator. */ char* tr_buildPath (const char * first_element, ...) TR_GNUC_NULL_TERMINATED TR_GNUC_MALLOC; /** * @brief Get available disk space (in bytes) for the specified folder. * @return zero or positive integer on success, -1 in case of error. */ int64_t tr_getDirFreeSpace (const char * path); struct event; /** * @brief Convenience wrapper around timer_add () to have a timer wake up in a number of seconds and microseconds * @param timer * @param seconds * @param microseconds */ void tr_timerAdd (struct event * timer, int seconds, int microseconds) TR_GNUC_NONNULL (1); /** * @brief Convenience wrapper around timer_add () to have a timer wake up in a number of milliseconds * @param timer * @param milliseconds */ void tr_timerAddMsec (struct event * timer, int milliseconds) TR_GNUC_NONNULL (1); /** @brief return the current date in milliseconds */ uint64_t tr_time_msec (void); /** @brief sleep the specified number of milliseconds */ void tr_wait_msec (long int delay_milliseconds); /** * @brief make a copy of 'str' whose non-utf8 content has been corrected or stripped * @return a newly-allocated string that must be freed with tr_free () * @param str the string to make a clean copy of * @param len the length of the string to copy. If -1, the entire string is used. */ char* tr_utf8clean (const char * str, int len) TR_GNUC_MALLOC; #ifdef _WIN32 char * tr_win32_native_to_utf8 (const wchar_t * text, int text_size); wchar_t * tr_win32_utf8_to_native (const char * text, int text_size); wchar_t * tr_win32_utf8_to_native_ex (const char * text, int text_size, int extra_chars); char * tr_win32_format_message (uint32_t code); void tr_win32_make_args_utf8 (int * argc, char *** argv); #endif /*** **** ***/ /* Sometimes the system defines MAX/MIN, sometimes not. In the latter case, define those here since we will use them */ #ifndef MAX #define MAX(a, b)((a) > (b) ? (a) : (b)) #endif #ifndef MIN #define MIN(a, b)((a) > (b) ? (b) : (a)) #endif /*** **** ***/ /** @brief Portability wrapper around malloc () in which `0' is a safe argument */ void* tr_malloc (size_t size); /** @brief Portability wrapper around calloc () in which `0' is a safe argument */ void* tr_malloc0 (size_t size); /** @brief Portability wrapper around free () in which `NULL' is a safe argument */ void tr_free (void * p); /** * @brief make a newly-allocated copy of a chunk of memory * @param src the memory to copy * @param byteCount the number of bytes to copy * @return a newly-allocated copy of `src' that can be freed with tr_free () */ void* tr_memdup (const void * src, size_t byteCount); #define tr_new(struct_type, n_structs) \ ((struct_type *) tr_malloc (sizeof (struct_type) * ((size_t)(n_structs)))) #define tr_new0(struct_type, n_structs) \ ((struct_type *) tr_malloc0 (sizeof (struct_type) * ((size_t)(n_structs)))) #define tr_renew(struct_type, mem, n_structs) \ ((struct_type *) realloc ((mem), sizeof (struct_type) * ((size_t)(n_structs)))) void* tr_valloc (size_t bufLen); /** * @brief make a newly-allocated copy of a substring * @param in is a void* so that callers can pass in both signed & unsigned without a cast * @param len length of the substring to copy. if a length less than zero is passed in, strlen (len) is used * @return a newly-allocated copy of `in' that can be freed with tr_free () */ char* tr_strndup (const void * in, int len) TR_GNUC_MALLOC; /** * @brief make a newly-allocated copy of a string * @param in is a void* so that callers can pass in both signed & unsigned without a cast * @return a newly-allocated copy of `in' that can be freed with tr_free () */ char* tr_strdup (const void * in); /** * @brief like strcmp () but gracefully handles NULL strings */ int tr_strcmp0 (const char * str1, const char * str2); struct evbuffer; char* evbuffer_free_to_str (struct evbuffer * buf); /** @brief similar to bsearch () but returns the index of the lower bound */ int tr_lowerBound (const void * key, const void * base, size_t nmemb, size_t size, int (* compar)(const void* key, const void* arrayMember), bool * exact_match) TR_GNUC_HOT TR_GNUC_NONNULL (1,5,6); /** @brief moves the best k items to the first slots in the array. O(n) */ void tr_quickfindFirstK (void * base, size_t nmemb, size_t size, int (*compar)(const void *, const void *), size_t k); /** * @brief sprintf () a string into a newly-allocated buffer large enough to hold it * @return a newly-allocated string that can be freed with tr_free () */ char* tr_strdup_printf (const char * fmt, ...) TR_GNUC_PRINTF (1, 2) TR_GNUC_MALLOC; char * tr_strdup_vprintf (const char * fmt, va_list args) TR_GNUC_MALLOC; /** @brief Portability wrapper for strlcpy () that uses the system implementation if available */ size_t tr_strlcpy (char * dst, const void * src, size_t siz); /** @brief Portability wrapper for snprintf () that uses the system implementation if available */ int tr_snprintf (char * buf, size_t buflen, const char * fmt, ...) TR_GNUC_PRINTF (3, 4) TR_GNUC_NONNULL (1,3); /** @brief Convenience wrapper around strerorr () guaranteed to not return NULL @param errno */ const char* tr_strerror (int); /** @brief strips leading and trailing whitspace from a string @return the stripped string */ char* tr_strstrip (char * str); /** @brief Returns true if the string ends with the specified case-insensitive suffix */ bool tr_str_has_suffix (const char *str, const char *suffix); /** @brief Portability wrapper for memmem () that uses the system implementation if available */ const char* tr_memmem (const char * haystack, size_t haystack_len, const char * needle, size_t needle_len); /** @brief Portability wrapper for strsep () that uses the system implementation if available */ char* tr_strsep (char ** str, const char * delim); /*** **** ***/ int compareInt (const void * va, const void * vb); void tr_binary_to_hex (const void * input, char * output, size_t byte_length) TR_GNUC_NONNULL (1,2); void tr_hex_to_binary (const char * input, void * output, size_t byte_length) TR_GNUC_NONNULL (1,2); /** @brief convenience function to determine if an address is an IP address (IPv4 or IPv6) */ bool tr_addressIsIP (const char * address); /** @brief return true if the url is a http or https url that Transmission understands */ bool tr_urlIsValidTracker (const char * url) TR_GNUC_NONNULL (1); /** @brief return true if the url is a [ http, https, ftp, ftps ] url that Transmission understands */ bool tr_urlIsValid (const char * url, int url_len) TR_GNUC_NONNULL (1); /** @brief parse a URL into its component parts @return zero on success or an error number if an error occurred */ int tr_urlParse (const char * url, int url_len, char ** setme_scheme, char ** setme_host, int * setme_port, char ** setme_path) TR_GNUC_NONNULL (1); /** @brief return TR_RATIO_NA, TR_RATIO_INF, or a number in [0..1] @return TR_RATIO_NA, TR_RATIO_INF, or a number in [0..1] */ double tr_getRatio (uint64_t numerator, uint64_t denominator); /** * @brief Given a string like "1-4" or "1-4,6,9,14-51", this returns a * newly-allocated array of all the integers in the set. * @return a newly-allocated array of integers that must be freed with tr_free (), * or NULL if a fragment of the string can't be parsed. * * For example, "5-8" will return [ 5, 6, 7, 8 ] and setmeCount will be 4. */ int* tr_parseNumberRange (const char * str, int str_len, int * setmeCount) TR_GNUC_MALLOC TR_GNUC_NONNULL (1); /** * @brief truncate a double value at a given number of decimal places. * * this can be used to prevent a printf () call from rounding up: * call with the decimal_places argument equal to the number of * decimal places in the printf ()'s precision: * * - printf ("%.2f%%", 99.999 ) ==> "100.00%" * * - printf ("%.2f%%", tr_truncd (99.999, 2)) ==> "99.99%" * ^ ^ * | These should match | * +------------------------+ */ double tr_truncd (double x, int decimal_places); /* return a percent formatted string of either x.xx, xx.x or xxx */ char* tr_strpercent (char * buf, double x, size_t buflen); /** * @param buf the buffer to write the string to * @param buflef buf's size * @param ratio the ratio to convert to a string * @param the string represntation of "infinity" */ char* tr_strratio (char * buf, size_t buflen, double ratio, const char * infinity) TR_GNUC_NONNULL (1,4); /** @brief Portability wrapper for localtime_r () that uses the system implementation if available */ struct tm * tr_localtime_r (const time_t *_clock, struct tm *_result); struct timeval; /** @brief Portability wrapper for gettimeofday (), with tz argument dropped */ int tr_gettimeofday (struct timeval * tv); /** * @brief move a file * @return 0 on success; otherwise, return -1 and set errno */ int tr_moveFile (const char * oldpath, const char * newpath, bool * renamed) TR_GNUC_NONNULL (1,2); /** @brief convenience function to remove an item from an array */ void tr_removeElementFromArray (void * array, unsigned int index_to_remove, size_t sizeof_element, size_t nmemb); /*** **** ***/ /** @brief Private libtransmission variable that's visible only for inlining in tr_time () */ extern time_t __tr_current_time; /** * @brief very inexpensive form of time (NULL) * @return the current epoch time in seconds * * This function returns a second counter that is updated once per second. * If something blocks the libtransmission thread for more than a second, * that counter may be thrown off, so this function is not guaranteed * to always be accurate. However, it is *much* faster when 100% accuracy * isn't needed */ static inline time_t tr_time (void) { return __tr_current_time; } /** @brief Private libtransmission function to update tr_time ()'s counter */ static inline void tr_timeUpdate (time_t now) { __tr_current_time = now; } /** @brief Portability wrapper for htonll () that uses the system implementation if available */ uint64_t tr_htonll (uint64_t); /** @brief Portability wrapper for htonll () that uses the system implementation if available */ uint64_t tr_ntohll (uint64_t); /*** **** ***/ /* example: tr_formatter_size_init (1024, _ ("KiB"), _ ("MiB"), _ ("GiB"), _ ("TiB")); */ void tr_formatter_size_init (unsigned int kilo, const char * kb, const char * mb, const char * gb, const char * tb); void tr_formatter_speed_init (unsigned int kilo, const char * kb, const char * mb, const char * gb, const char * tb); void tr_formatter_mem_init (unsigned int kilo, const char * kb, const char * mb, const char * gb, const char * tb); extern unsigned int tr_speed_K; extern unsigned int tr_mem_K; extern unsigned int tr_size_K; /* format a speed from KBps into a user-readable string. */ char* tr_formatter_speed_KBps (char * buf, double KBps, size_t buflen); /* format a memory size from bytes into a user-readable string. */ char* tr_formatter_mem_B (char * buf, int64_t bytes, size_t buflen); /* format a memory size from MB into a user-readable string. */ static inline char* tr_formatter_mem_MB (char * buf, double MBps, size_t buflen) { return tr_formatter_mem_B (buf, MBps * tr_mem_K * tr_mem_K, buflen); } /* format a file size from bytes into a user-readable string. */ char* tr_formatter_size_B (char * buf, int64_t bytes, size_t buflen); void tr_formatter_get_units (void * dict); /*** **** ***/ /** @brief Check if environment variable exists. */ bool tr_env_key_exists (const char * key); /** @brief Get environment variable value as int. */ int tr_env_get_int (const char * key, int default_value); /** @brief Get environment variable value as string (should be freed afterwards). */ char * tr_env_get_string (const char * key, const char * default_value); /*** **** ***/ #ifdef __cplusplus } #endif /** @} */ #endif