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transmission/libtransmission/utils.h

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/*
* This file Copyright (C) 2009-2010 Mnemosyne LLC
*
* This file is licensed by the GPL version 2. Works owned by the
* Transmission project are granted a special exemption to clause 2(b)
* so that the bulk of its code can remain under the MIT license.
* This exemption does not extend to derived works not owned by
* the Transmission project.
*
* $Id$
*/
#ifndef TR_UTILS_H
#define TR_UTILS_H 1
#include <inttypes.h>
#include <stddef.h> /* size_t */
#include <stdio.h> /* FILE* */
#include <string.h> /* memcpy()* */
#include <stdlib.h> /* malloc() */
#include <time.h> /* time_t */
#ifdef __cplusplus
extern "C" {
#endif
/***
****
***/
/**
* @addtogroup utils Utilities
* @{
*/
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#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_PURE __attribute__ ( ( __pure__ ) )
#define TR_GNUC_MALLOC __attribute__ ( ( __malloc__ ) )
#else
#define TR_GNUC_PURE
#define TR_GNUC_MALLOC
#endif
/***
****
***/
#if !defined( _ )
#if defined( HAVE_LIBINTL_H ) && !defined( SYS_DARWIN )
#include <libintl.h>
#define _( a ) gettext ( a )
#else
#define _( a ) ( a )
#endif
#endif
/* #define DISABLE_GETTEXT */
#if defined(TR_EMBEDDED) && !defined(DISABLE_GETTEXT)
#define DISABLE_GETTEXT
#endif
#ifdef DISABLE_GETTEXT
const char * tr_strip_positional_args( const char * fmt );
#undef _
#define _( a ) tr_strip_positional_args( a )
#endif
/****
*****
****/
void tr_msgInit( void );
#define TR_MAX_MSG_LOG 10000
extern int messageLevel;
static inline tr_bool tr_msgLoggingIsActive( int level )
{
return messageLevel >= level;
}
void tr_msg( const char * file, int line,
int level,
const char * torrent,
const char * fmt, ... ) TR_GNUC_PRINTF( 5, 6 );
#define tr_nerr( n, ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_ERR ) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_ERR, n, __VA_ARGS__ ); \
} while( 0 )
#define tr_ninf( n, ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_INF) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_INF, n, __VA_ARGS__ ); \
} while( 0 )
#define tr_ndbg( n, ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_DBG) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_DBG, n, __VA_ARGS__ ); \
} while( 0 )
#define tr_torerr( tor, ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_ERR ) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_ERR, tor->info.name, __VA_ARGS__ ); \
} while( 0 )
#define tr_torinf( tor, ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_INF ) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_INF, tor->info.name, __VA_ARGS__ ); \
} while( 0 )
#define tr_tordbg( tor, ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_DBG ) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_DBG, tor->info.name, __VA_ARGS__ ); \
} while( 0 )
#define tr_err( ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_ERR ) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_ERR, NULL, __VA_ARGS__ ); \
} while( 0 )
#define tr_inf( ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_INF ) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_INF, NULL, __VA_ARGS__ ); \
} while( 0 )
#define tr_dbg( ... ) \
do { \
if( tr_msgLoggingIsActive( TR_MSG_DBG ) ) \
tr_msg( __FILE__, __LINE__, TR_MSG_DBG, NULL, __VA_ARGS__ ); \
} while( 0 )
FILE* tr_getLog( void );
/** @brief return true if deep logging has been enabled by the user; false otherwise */
tr_bool tr_deepLoggingIsActive( void );
void tr_deepLog( const char * file,
int line,
const char * name,
const char * fmt,
... ) TR_GNUC_PRINTF( 4, 5 ) TR_GNUC_NONNULL(1,4);
/** @brief set the buffer with the current time formatted for deep logging. */
char* tr_getLogTimeStr( char * buf, int buflen ) TR_GNUC_NONNULL(1);
/**
* @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
*/
int tr_wildmat( const char * text, const char * pattern ) TR_GNUC_NONNULL(1,2);
/** @brief Portability wrapper for basename() that uses the system implementation if available */
char* tr_basename( const char * path ) TR_GNUC_MALLOC;
/** @brief Portability wrapper for dirname() that uses the system implementation if available */
char* tr_dirname( const char * path ) TR_GNUC_MALLOC;
/**
* @brief Portability wrapper for mkdir()
*
* A portability wrapper around mkdir().
* On WIN32, the `permissions' argument is unused.
*
* @return zero on success, or -1 if an error occurred
* (in which case errno is set appropriately).
*/
int tr_mkdir( const char * path, int permissions ) TR_GNUC_NONNULL(1);
/**
* Like mkdir, but makes parent directories as needed.
*
* @return zero on success, or -1 if an error occurred
* (in which case errno is set appropriately).
*/
int tr_mkdirp( const char * path, int permissions ) TR_GNUC_NONNULL(1);
/**
* @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;
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_date( void );
/** @brief sleep the specified number of milliseconds */
void tr_wait_msec( uint64_t 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.
* @param err if an error occurs and err is non-NULL, it's set to TRUE.
*/
char* tr_utf8clean( const char * str, int len, tr_bool * err ) TR_GNUC_MALLOC;
/***
****
***/
/* 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 */
static inline void* tr_malloc( size_t size )
{
return size ? malloc( size ) : NULL;
}
/** @brief Portability wrapper around calloc() in which `0' is a safe argument */
static inline void* tr_malloc0( size_t size )
{
return size ? calloc( 1, size ) : NULL;
}
/** @brief Portability wrapper around free() in which `NULL' is a safe argument */
static inline void tr_free( void * p )
{
if( p != NULL )
free( 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()
*/
static inline void* tr_memdup( const void * src, int byteCount )
{
return memcpy( tr_malloc( byteCount ), src, byteCount );
}
#define tr_new( struct_type, n_structs ) \
( (struct_type *) tr_malloc ( ( (size_t) sizeof ( struct_type ) ) * ( ( size_t) ( n_structs ) ) ) )
#define tr_new0( struct_type, n_structs ) \
( (struct_type *) tr_malloc0 ( ( (size_t) sizeof ( struct_type ) ) * ( ( size_t) ( n_structs ) ) ) )
#define tr_renew( struct_type, mem, n_structs ) \
( (struct_type *) realloc ( ( mem ), ( (size_t) 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()
*/
static inline char* tr_strdup( const void * in )
{
return tr_strndup( in, in ? strlen( (const char *) in ) : 0 );
}
/** @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),
tr_bool * exact_match ) TR_GNUC_HOT TR_GNUC_NONNULL(1,5,6);
/**
* @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;
/**
* @brief Translate a block of bytes into base64
* @return a newly-allocated string that can be freed with tr_free()
*/
char* tr_base64_encode( const void * input,
int inlen,
int * outlen ) TR_GNUC_MALLOC;
/**
* @brief Translate a block of bytes from base64 into raw form
* @return a newly-allocated string that can be freed with tr_free()
*/
char* tr_base64_decode( const void * input,
int inlen,
int * outlen ) 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 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 );
/***
****
***/
typedef void ( tr_set_func )( void * element, void * userData );
/**
* @brief find the differences and commonalities in two sorted sets
* @param a the first set
* @param aCount the number of elements in the set 'a'
* @param b the second set
* @param bCount the number of elements in the set 'b'
* @param compare the sorting method for both sets
* @param elementSize the sizeof the element in the two sorted sets
* @param in_a called for items in set 'a' but not set 'b'
* @param in_b called for items in set 'b' but not set 'a'
* @param in_both called for items that are in both sets
* @param userData user data passed along to in_a, in_b, and in_both
*/
void tr_set_compare( const void * a, size_t aCount,
const void * b, size_t bCount,
int compare( const void * a, const void * b ),
size_t elementSize,
tr_set_func in_a_cb,
tr_set_func in_b_cb,
tr_set_func in_both_cb,
void * userData );
void tr_sha1_to_hex( char * out, const uint8_t * sha1 ) TR_GNUC_NONNULL(1,2);
void tr_hex_to_sha1( uint8_t * out, const char * hex ) TR_GNUC_NONNULL(1,2);
/** @brief convenience function to determine if an address is an IP address (IPv4 or IPv6) */
tr_bool tr_addressIsIP( const char * address );
/** @brief return TRUE if the url is a http or https url that Transmission understands */
tr_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 */
tr_bool tr_urlIsValid( const char * url ) 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( double numerator, double 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 );
/**
* @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 move a file
* @return 0 on success; otherwise, return -1 and set errno
*/
int tr_moveFile( const char * oldpath, const char * newpath,
tr_bool * renamed ) TR_GNUC_NONNULL(1,2);
/** @brief convenience function to remove an item from an array */
static inline void tr_removeElementFromArray( void * array,
int index_to_remove,
size_t sizeof_element,
size_t nmemb )
{
char * a = (char*) array;
memmove( a + sizeof_element * index_to_remove,
a + sizeof_element * ( index_to_remove + 1 ),
sizeof_element * ( --nmemb - index_to_remove ) );
}
/***
****
***/
/** @brief Private libtransmission variable that's visible only for inlining in tr_time() */
extern time_t transmission_now;
/**
* @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 transmission_now; }
/** @brief Private libtransmission function to update tr_time()'s counter */
static inline void tr_timeUpdate( time_t now ) { transmission_now = now; }
/***
****
***/
#ifdef __cplusplus
}
#endif
/** @} */
#endif
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