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transmission/libtransmission/utils.h

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/*
* 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 <inttypes.h>
#include <stdarg.h>
#include <stddef.h> /* size_t */
#include <time.h> /* time_t */
#ifdef __cplusplus
extern "C" {
#endif
/***
****
***/
struct evbuffer;
struct event;
struct timeval;
struct tr_error;
/**
* @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
#ifdef __UCLIBC__
#define TR_UCLIBC_CHECK_VERSION(major, minor, micro) \
(__UCLIBC_MAJOR__ > (major) || \
(__UCLIBC_MAJOR__ == (major) && __UCLIBC_MINOR__ > (minor)) || \
(__UCLIBC_MAJOR__ == (major) && __UCLIBC_MINOR__ == (minor) && \
__UCLIBC_SUBLEVEL__ >= (micro)))
#else
#define TR_UCLIBC_CHECK_VERSION(major, minor, micro) 0
#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) { typedef char __tr_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 <libintl.h>
#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,
struct tr_error ** error) 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);
/**
* @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, size_t 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_before,
int extra_chars_after,
int * real_result_size);
char * tr_win32_format_message (uint32_t code);
void tr_win32_make_args_utf8 (int * argc,
char *** argv);
int tr_main_win32 (int argc,
char ** argv,
int (*real_main) (int, char **));
#define tr_main(...) \
main_impl (__VA_ARGS__); \
int \
main (int argc, \
char * argv[]) \
{ \
return tr_main_win32 (argc, argv, &main_impl); \
} \
int \
main_impl (__VA_ARGS__)
#else
#define tr_main main
#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 reallocf () in which `0' is a safe argument */
void * tr_realloc (void * p, 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 *) tr_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, size_t 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);
char* evbuffer_free_to_str (struct evbuffer * buf,
size_t * result_len);
/** @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 or UDP url that Transmission understands */
bool tr_urlIsValidTracker (const char * url);
/** @brief return true if the url is a [ http, https, ftp, sftp ] url that Transmission understands */
bool tr_urlIsValid (const char * url, size_t url_len);
/** @brief parse a URL into its component parts
@return True on success or false if an error occurred */
bool tr_urlParse (const char * url,
size_t 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,
size_t 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);
/** @brief Portability wrapper for gettimeofday (), with tz argument dropped */
int tr_gettimeofday (struct timeval * tv);
/**
* @brief move a file
* @return `True` on success, `false` otherwise (with `error` set accordingly).
*/
bool tr_moveFile (const char * oldpath,
const char * newpath,
struct tr_error ** error) 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);
/***
****
***/
void tr_net_init (void);
/***
****
***/
#ifdef __cplusplus
}
#endif
/** @} */
#endif
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