mirror of
https://github.com/transmission/transmission
synced 2024-12-25 09:13:06 +00:00
513 lines
16 KiB
C
513 lines
16 KiB
C
/*
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* This file Copyright (C) 2009-2014 Mnemosyne LLC
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*
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* It may be used under the GNU GPL versions 2 or 3
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* or any future license endorsed by Mnemosyne LLC.
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*
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* $Id$
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*/
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#ifndef TR_UTILS_H
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#define TR_UTILS_H 1
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#include <inttypes.h>
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#include <stdarg.h>
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#include <stddef.h> /* size_t */
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#include <time.h> /* time_t */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***
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****
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***/
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/**
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* @addtogroup utils Utilities
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* @{
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*/
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#ifndef UNUSED
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#ifdef __GNUC__
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#define UNUSED __attribute__ ((unused))
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#else
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#define UNUSED
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#endif
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#endif
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#ifndef TR_GNUC_PRINTF
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#ifdef __GNUC__
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#define TR_GNUC_PRINTF(fmt, args) __attribute__ ((format (printf, fmt, args)))
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#else
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#define TR_GNUC_PRINTF(fmt, args)
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#endif
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#endif
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#ifndef TR_GNUC_NONNULL
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#ifdef __GNUC__
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#define TR_GNUC_NONNULL(...) __attribute__ ((nonnull (__VA_ARGS__)))
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#else
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#define TR_GNUC_NONNULL(...)
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#endif
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#endif
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#ifndef TR_GNUC_NULL_TERMINATED
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
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#define TR_GNUC_NULL_TERMINATED __attribute__ ((__sentinel__))
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#define TR_GNUC_HOT __attribute ((hot))
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#else
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#define TR_GNUC_NULL_TERMINATED
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#define TR_GNUC_HOT
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#endif
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#endif
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#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
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#define TR_GNUC_MALLOC __attribute__ ((__malloc__))
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#else
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#define TR_GNUC_MALLOC
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#endif
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#ifndef __has_feature
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#define __has_feature(x) 0
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#endif
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#ifndef __has_extension
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#define __has_extension __has_feature
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#endif
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/**
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* @def TR_STATIC_ASSERT
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* @brief This helper allows to perform static checks at compile time
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*/
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#if defined (static_assert)
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#define TR_STATIC_ASSERT static_assert
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#elif __has_feature (c_static_assert) || __has_extension (c_static_assert)
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#define TR_STATIC_ASSERT _Static_assert
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#else
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#define TR_STATIC_ASSERT(x, msg) { const char static_check[((x) ? 1 : -1)] UNUSED; }
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#endif
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/***
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****
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***/
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const char * tr_strip_positional_args (const char * fmt);
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#if !defined (_)
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#if defined (HAVE_LIBINTL_H) && !defined (__APPLE__)
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#include <libintl.h>
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#define _(a) gettext (a)
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#else
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#define _(a)(a)
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#endif
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#endif
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/* #define DISABLE_GETTEXT */
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#ifndef DISABLE_GETTEXT
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#if defined (_WIN32) || defined (TR_LIGHTWEIGHT)
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#define DISABLE_GETTEXT
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#endif
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#endif
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#ifdef DISABLE_GETTEXT
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#undef _
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#define _(a) tr_strip_positional_args (a)
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#endif
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/****
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*****
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****/
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/**
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* @brief Rich Salz's classic implementation of shell-style pattern matching for ?, \, [], and * characters.
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* @return 1 if the pattern matches, 0 if it doesn't, or -1 if an error occured
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*/
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bool tr_wildmat (const char * text, const char * pattern) TR_GNUC_NONNULL (1,2);
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/**
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* @brief Loads a file and returns its contents.
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* On failure, NULL is returned and errno is set.
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*/
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uint8_t* tr_loadFile (const char * filename, size_t * size) TR_GNUC_MALLOC
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TR_GNUC_NONNULL (1);
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/** @brief build a filename from a series of elements using the
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platform's correct directory separator. */
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char* tr_buildPath (const char * first_element, ...) TR_GNUC_NULL_TERMINATED
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TR_GNUC_MALLOC;
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/**
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* @brief Get available disk space (in bytes) for the specified folder.
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* @return zero or positive integer on success, -1 in case of error.
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*/
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int64_t tr_getDirFreeSpace (const char * path);
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struct event;
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/**
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* @brief Convenience wrapper around timer_add () to have a timer wake up in a number of seconds and microseconds
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* @param timer
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* @param seconds
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* @param microseconds
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*/
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void tr_timerAdd (struct event * timer, int seconds, int microseconds) TR_GNUC_NONNULL (1);
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/**
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* @brief Convenience wrapper around timer_add () to have a timer wake up in a number of milliseconds
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* @param timer
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* @param milliseconds
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*/
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void tr_timerAddMsec (struct event * timer, int milliseconds) TR_GNUC_NONNULL (1);
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/** @brief return the current date in milliseconds */
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uint64_t tr_time_msec (void);
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/** @brief sleep the specified number of milliseconds */
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void tr_wait_msec (long int delay_milliseconds);
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/**
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* @brief make a copy of 'str' whose non-utf8 content has been corrected or stripped
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* @return a newly-allocated string that must be freed with tr_free ()
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* @param str the string to make a clean copy of
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* @param len the length of the string to copy. If -1, the entire string is used.
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*/
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char* tr_utf8clean (const char * str, int len) TR_GNUC_MALLOC;
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#ifdef _WIN32
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char * tr_win32_native_to_utf8 (const wchar_t * text,
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int text_size);
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wchar_t * tr_win32_utf8_to_native (const char * text,
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int text_size);
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wchar_t * tr_win32_utf8_to_native_ex (const char * text,
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int text_size,
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int extra_chars);
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char * tr_win32_format_message (uint32_t code);
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void tr_win32_make_args_utf8 (int * argc,
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char *** argv);
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#endif
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/***
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****
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***/
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/* Sometimes the system defines MAX/MIN, sometimes not.
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In the latter case, define those here since we will use them */
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#ifndef MAX
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#define MAX(a, b)((a) > (b) ? (a) : (b))
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#endif
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#ifndef MIN
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#define MIN(a, b)((a) > (b) ? (b) : (a))
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#endif
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/***
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****
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***/
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/** @brief Portability wrapper around malloc () in which `0' is a safe argument */
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void* tr_malloc (size_t size);
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/** @brief Portability wrapper around calloc () in which `0' is a safe argument */
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void* tr_malloc0 (size_t size);
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/** @brief Portability wrapper around free () in which `NULL' is a safe argument */
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void tr_free (void * p);
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/**
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* @brief make a newly-allocated copy of a chunk of memory
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* @param src the memory to copy
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* @param byteCount the number of bytes to copy
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* @return a newly-allocated copy of `src' that can be freed with tr_free ()
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*/
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void* tr_memdup (const void * src, size_t byteCount);
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#define tr_new(struct_type, n_structs) \
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((struct_type *) tr_malloc (sizeof (struct_type) * ((size_t)(n_structs))))
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#define tr_new0(struct_type, n_structs) \
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((struct_type *) tr_malloc0 (sizeof (struct_type) * ((size_t)(n_structs))))
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#define tr_renew(struct_type, mem, n_structs) \
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((struct_type *) realloc ((mem), sizeof (struct_type) * ((size_t)(n_structs))))
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void* tr_valloc (size_t bufLen);
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/**
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* @brief make a newly-allocated copy of a substring
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* @param in is a void* so that callers can pass in both signed & unsigned without a cast
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* @param len length of the substring to copy. if a length less than zero is passed in, strlen (len) is used
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* @return a newly-allocated copy of `in' that can be freed with tr_free ()
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*/
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char* tr_strndup (const void * in, int len) TR_GNUC_MALLOC;
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/**
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* @brief make a newly-allocated copy of a string
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* @param in is a void* so that callers can pass in both signed & unsigned without a cast
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* @return a newly-allocated copy of `in' that can be freed with tr_free ()
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*/
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char* tr_strdup (const void * in);
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/**
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* @brief like strcmp () but gracefully handles NULL strings
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*/
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int tr_strcmp0 (const char * str1, const char * str2);
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struct evbuffer;
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char* evbuffer_free_to_str (struct evbuffer * buf);
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/** @brief similar to bsearch () but returns the index of the lower bound */
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int tr_lowerBound (const void * key,
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const void * base,
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size_t nmemb,
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size_t size,
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int (* compar)(const void* key, const void* arrayMember),
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bool * exact_match) TR_GNUC_HOT TR_GNUC_NONNULL (1,5,6);
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/** @brief moves the best k items to the first slots in the array. O(n) */
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void tr_quickfindFirstK (void * base, size_t nmemb, size_t size,
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int (*compar)(const void *, const void *), size_t k);
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/**
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* @brief sprintf () a string into a newly-allocated buffer large enough to hold it
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* @return a newly-allocated string that can be freed with tr_free ()
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*/
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char* tr_strdup_printf (const char * fmt, ...) TR_GNUC_PRINTF (1, 2)
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TR_GNUC_MALLOC;
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char * tr_strdup_vprintf (const char * fmt,
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va_list args) TR_GNUC_MALLOC;
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/**
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* @brief Translate a block of bytes into base64
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* @return a newly-allocated string that can be freed with tr_free ()
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*/
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char* tr_base64_encode (const void * input,
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int inlen,
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int * outlen) TR_GNUC_MALLOC;
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/**
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* @brief Translate a block of bytes from base64 into raw form
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* @return a newly-allocated string that can be freed with tr_free ()
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*/
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char* tr_base64_decode (const void * input,
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int inlen,
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int * outlen) TR_GNUC_MALLOC;
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/** @brief Portability wrapper for strlcpy () that uses the system implementation if available */
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size_t tr_strlcpy (char * dst, const void * src, size_t siz);
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/** @brief Portability wrapper for snprintf () that uses the system implementation if available */
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int tr_snprintf (char * buf, size_t buflen,
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const char * fmt, ...) TR_GNUC_PRINTF (3, 4) TR_GNUC_NONNULL (1,3);
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/** @brief Convenience wrapper around strerorr () guaranteed to not return NULL
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@param errno */
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const char* tr_strerror (int);
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/** @brief strips leading and trailing whitspace from a string
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@return the stripped string */
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char* tr_strstrip (char * str);
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/** @brief Returns true if the string ends with the specified case-insensitive suffix */
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bool tr_str_has_suffix (const char *str, const char *suffix);
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/** @brief Portability wrapper for memmem () that uses the system implementation if available */
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const char* tr_memmem (const char * haystack, size_t haystack_len,
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const char * needle, size_t needle_len);
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/** @brief Portability wrapper for strsep () that uses the system implementation if available */
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char* tr_strsep (char ** str, const char * delim);
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/***
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****
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***/
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int compareInt (const void * va, const void * vb);
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void tr_sha1_to_hex (char * out, const uint8_t * sha1) TR_GNUC_NONNULL (1,2);
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void tr_hex_to_sha1 (uint8_t * out, const char * hex) TR_GNUC_NONNULL (1,2);
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/** @brief convenience function to determine if an address is an IP address (IPv4 or IPv6) */
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bool tr_addressIsIP (const char * address);
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/** @brief return true if the url is a http or https url that Transmission understands */
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bool tr_urlIsValidTracker (const char * url) TR_GNUC_NONNULL (1);
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/** @brief return true if the url is a [ http, https, ftp, ftps ] url that Transmission understands */
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bool tr_urlIsValid (const char * url, int url_len) TR_GNUC_NONNULL (1);
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/** @brief parse a URL into its component parts
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@return zero on success or an error number if an error occurred */
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int tr_urlParse (const char * url,
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int url_len,
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char ** setme_scheme,
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char ** setme_host,
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int * setme_port,
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char ** setme_path) TR_GNUC_NONNULL (1);
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/** @brief return TR_RATIO_NA, TR_RATIO_INF, or a number in [0..1]
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@return TR_RATIO_NA, TR_RATIO_INF, or a number in [0..1] */
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double tr_getRatio (uint64_t numerator, uint64_t denominator);
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/**
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* @brief Given a string like "1-4" or "1-4,6,9,14-51", this returns a
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* newly-allocated array of all the integers in the set.
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* @return a newly-allocated array of integers that must be freed with tr_free (),
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* or NULL if a fragment of the string can't be parsed.
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*
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* For example, "5-8" will return [ 5, 6, 7, 8 ] and setmeCount will be 4.
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*/
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int* tr_parseNumberRange (const char * str,
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int str_len,
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int * setmeCount) TR_GNUC_MALLOC TR_GNUC_NONNULL (1);
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/**
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* @brief truncate a double value at a given number of decimal places.
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*
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* this can be used to prevent a printf () call from rounding up:
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* call with the decimal_places argument equal to the number of
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* decimal places in the printf ()'s precision:
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*
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* - printf ("%.2f%%", 99.999 ) ==> "100.00%"
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*
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* - printf ("%.2f%%", tr_truncd (99.999, 2)) ==> "99.99%"
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* ^ ^
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* | These should match |
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* +------------------------+
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*/
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double tr_truncd (double x, int decimal_places);
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/* return a percent formatted string of either x.xx, xx.x or xxx */
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char* tr_strpercent (char * buf, double x, size_t buflen);
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/**
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* @param buf the buffer to write the string to
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* @param buflef buf's size
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* @param ratio the ratio to convert to a string
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* @param the string represntation of "infinity"
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*/
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char* tr_strratio (char * buf, size_t buflen, double ratio, const char * infinity) TR_GNUC_NONNULL (1,4);
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/** @brief Portability wrapper for localtime_r () that uses the system implementation if available */
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struct tm * tr_localtime_r (const time_t *_clock, struct tm *_result);
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struct timeval;
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/** @brief Portability wrapper for gettimeofday (), with tz argument dropped */
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int tr_gettimeofday (struct timeval * tv);
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/**
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* @brief move a file
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* @return 0 on success; otherwise, return -1 and set errno
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*/
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int tr_moveFile (const char * oldpath, const char * newpath,
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bool * renamed) TR_GNUC_NONNULL (1,2);
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/** @brief convenience function to remove an item from an array */
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void tr_removeElementFromArray (void * array,
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unsigned int index_to_remove,
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size_t sizeof_element,
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size_t nmemb);
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/***
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****
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***/
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/** @brief Private libtransmission variable that's visible only for inlining in tr_time () */
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extern time_t __tr_current_time;
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/**
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* @brief very inexpensive form of time (NULL)
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* @return the current epoch time in seconds
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*
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* This function returns a second counter that is updated once per second.
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* If something blocks the libtransmission thread for more than a second,
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* that counter may be thrown off, so this function is not guaranteed
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* to always be accurate. However, it is *much* faster when 100% accuracy
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* isn't needed
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*/
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static inline time_t tr_time (void) { return __tr_current_time; }
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/** @brief Private libtransmission function to update tr_time ()'s counter */
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static inline void tr_timeUpdate (time_t now) { __tr_current_time = now; }
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/** @brief Portability wrapper for htonll () that uses the system implementation if available */
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uint64_t tr_htonll (uint64_t);
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/** @brief Portability wrapper for htonll () that uses the system implementation if available */
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uint64_t tr_ntohll (uint64_t);
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/***
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****
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***/
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/* example: tr_formatter_size_init (1024, _ ("KiB"), _ ("MiB"), _ ("GiB"), _ ("TiB")); */
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void tr_formatter_size_init (unsigned int kilo, const char * kb, const char * mb,
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const char * gb, const char * tb);
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void tr_formatter_speed_init (unsigned int kilo, const char * kb, const char * mb,
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const char * gb, const char * tb);
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void tr_formatter_mem_init (unsigned int kilo, const char * kb, const char * mb,
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const char * gb, const char * tb);
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extern unsigned int tr_speed_K;
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extern unsigned int tr_mem_K;
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extern unsigned int tr_size_K;
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/* format a speed from KBps into a user-readable string. */
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char* tr_formatter_speed_KBps (char * buf, double KBps, size_t buflen);
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/* format a memory size from bytes into a user-readable string. */
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char* tr_formatter_mem_B (char * buf, int64_t bytes, size_t buflen);
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/* format a memory size from MB into a user-readable string. */
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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); }
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/* format a file size from bytes into a user-readable string. */
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char* tr_formatter_size_B (char * buf, int64_t bytes, size_t buflen);
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void tr_formatter_get_units (void * dict);
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/***
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****
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***/
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/** @brief Check if environment variable exists. */
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bool tr_env_key_exists (const char * key);
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/** @brief Get environment variable value as int. */
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int tr_env_get_int (const char * key,
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int default_value);
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/** @brief Get environment variable value as string (should be freed afterwards). */
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char * tr_env_get_string (const char * key,
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const char * default_value);
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/***
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****
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***/
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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#endif
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