transmission/libtransmission/utils.h

421 lines
14 KiB
C++

/*
* This file Copyright (C) 2009-2017 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#pragma once
#include <inttypes.h>
#include <stdarg.h>
#include <stddef.h> /* size_t */
#include <string_view>
#include <time.h> /* time_t */
#include <vector>
#include "tr-macros.h"
/***
****
***/
struct evbuffer;
struct event;
struct timeval;
struct tr_error;
struct tr_disk_space;
/**
* @addtogroup utils Utilities
* @{
*/
char const* tr_strip_positional_args(char const* 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
/****
*****
****/
#define TR_N_ELEMENTS(ary) (sizeof(ary) / sizeof(*(ary)))
char const* tr_get_mime_type_for_filename(std::string_view filename);
/**
* @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(char const* text, char const* 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(char const* 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(char const* first_element, ...) TR_GNUC_NULL_TERMINATED TR_GNUC_MALLOC;
/**
* @brief Get disk capacity and free disk space (in bytes) for the specified folder.
* @return struct with free and total as zero or positive integer on success, -1 in case of error.
*/
struct tr_disk_space tr_getDirSpace(char const* path);
/**
* @brief Convenience wrapper around timer_add() to have a timer wake up in a number of seconds and microseconds
* @param timer the timer to set
* @param seconds seconds to wait
* @param microseconds microseconds to wait
*/
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 the timer to set
* @param milliseconds milliseconds to wait
*/
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(char const* str, size_t len) TR_GNUC_MALLOC;
#ifdef _WIN32
char* tr_win32_native_to_utf8(wchar_t const* text, int text_size);
char* tr_win32_native_to_utf8_ex(
wchar_t const* text,
int text_size,
int extra_chars_before,
int extra_chars_after,
int* real_result_size);
wchar_t* tr_win32_utf8_to_native(char const* text, int text_size);
wchar_t* tr_win32_utf8_to_native_ex(
char const* 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
/***
****
***/
/** @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 `nullptr' is a safe argument */
void tr_free(void* p);
/** @brief Free pointers in a nullptr-terminated array (the array itself is not freed) */
void tr_free_ptrv(void* const* 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(void const* 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)))
/**
* @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(void const* 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(void const* in);
/**
* @brief like strcmp() but gracefully handles nullptr strings
*/
int tr_strcmp0(char const* str1, char const* str2);
constexpr bool tr_str_is_empty(char const* value)
{
return value == nullptr || *value == '\0';
}
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(
void const* key,
void const* base,
size_t nmemb,
size_t size,
tr_voidptr_compare_func compar,
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(char const* fmt, ...) TR_GNUC_MALLOC TR_GNUC_PRINTF(1, 2);
char* tr_strdup_vprintf(char const* fmt, va_list args) TR_GNUC_MALLOC TR_GNUC_PRINTF(1, 0);
/** @brief Portability wrapper for strlcpy() that uses the system implementation if available */
size_t tr_strlcpy(void* dst, void const* src, size_t siz);
/** @brief Portability wrapper for snprintf() that uses the system implementation if available */
int tr_snprintf(void* buf, size_t buflen, char const* fmt, ...) TR_GNUC_PRINTF(3, 4) TR_GNUC_NONNULL(1, 3);
/** @brief Convenience wrapper around strerorr() guaranteed to not return nullptr
@param errnum the error number to describe */
char const* tr_strerror(int errnum);
/** @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(char const* str, char const* suffix);
/** @brief Portability wrapper for memmem() that uses the system implementation if available */
char const* tr_memmem(char const* haystack, size_t haystack_len, char const* needle, size_t needle_len);
/** @brief Portability wrapper for strcasestr() that uses the system implementation if available */
char const* tr_strcasestr(char const* haystack, char const* needle);
/** @brief Portability wrapper for strsep() that uses the system implementation if available */
char* tr_strsep(char** str, char const* delim);
/***
****
***/
void tr_binary_to_hex(void const* input, void* output, size_t byte_length) TR_GNUC_NONNULL(1, 2);
void tr_hex_to_binary(void const* 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(char const* address);
/** @brief return true if the url is a http or https or UDP url that Transmission understands */
bool tr_urlIsValidTracker(char const* url);
/** @brief return true if the url is a [ http, https, ftp, sftp ] url that Transmission understands */
bool tr_urlIsValid(char const* 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(char const* 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 nullptr 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.
*/
std::vector<int> tr_parseNumberRange(char const* str, size_t str_len) 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 buflen buf's size
* @param ratio the ratio to convert to a string
* @param infinity the string represntation of "infinity"
*/
char* tr_strratio(char* buf, size_t buflen, double ratio, char const* infinity) TR_GNUC_NONNULL(1, 4);
/** @brief Portability wrapper for localtime_r() that uses the system implementation if available */
struct tm* tr_localtime_r(time_t const* _clock, struct tm* _result);
/** @brief Portability wrapper for gmtime_r() that uses the system implementation if available */
struct tm* tr_gmtime_r(time_t const* _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(char const* oldpath, char const* 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, size_t 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(nullptr)
* @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 */
constexpr 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(size_t kilo, char const* kb, char const* mb, char const* gb, char const* tb);
void tr_formatter_speed_init(size_t kilo, char const* kb, char const* mb, char const* gb, char const* tb);
void tr_formatter_mem_init(size_t kilo, char const* kb, char const* mb, char const* gb, char const* tb);
extern size_t tr_speed_K;
extern size_t tr_mem_K;
extern size_t 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, size_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, (size_t)(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, size_t bytes, size_t buflen);
void tr_formatter_get_units(void* dict);
/***
****
***/
/** @brief Check if environment variable exists. */
bool tr_env_key_exists(char const* key);
/** @brief Get environment variable value as int. */
int tr_env_get_int(char const* key, int default_value);
/** @brief Get environment variable value as string (should be freed afterwards). */
char* tr_env_get_string(char const* key, char const* default_value);
/***
****
***/
void tr_net_init(void);