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Location: cpp/openttd-patchpack/source/src/fileio.cpp - annotation
r6395:cb11d86befed
10.2 KiB
text/x-c
(svn r9525) -Update: WebTranslator2 update to 2007-03-29 19:56:13
estonian - 3 fixed, 4 changed by kristjans (7)
finnish - 2 fixed by pallokala (2)
italian - 1 changed by lorenzodv (1)
traditional_chinese - 1 changed by xbddc (1)
turkish - 12 fixed by jnmbk (12)
estonian - 3 fixed, 4 changed by kristjans (7)
finnish - 2 fixed by pallokala (2)
italian - 1 changed by lorenzodv (1)
traditional_chinese - 1 changed by xbddc (1)
turkish - 12 fixed by jnmbk (12)
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/** @file fileio.cpp Standard In/Out file operations */
#include "stdafx.h"
#include "openttd.h"
#include "fileio.h"
#include "functions.h"
#include "string.h"
#include "macros.h"
#include "variables.h"
#include "debug.h"
#include "fios.h"
#ifndef WIN32
#include <pwd.h>
#include <unistd.h>
#include <sys/stat.h>
#endif
/*************************************************/
/* FILE IO ROUTINES ******************************/
/*************************************************/
#define FIO_BUFFER_SIZE 512
#define MAX_HANDLES 64
struct Fio {
byte *buffer, *buffer_end; ///< position pointer in local buffer and last valid byte of buffer
uint32 pos; ///< current (system) position in file
FILE *cur_fh; ///< current file handle
FILE *handles[MAX_HANDLES]; ///< array of file handles we can have open
byte buffer_start[FIO_BUFFER_SIZE]; ///< local buffer when read from file
#if defined(LIMITED_FDS)
uint open_handles; ///< current amount of open handles
const char *filename[MAX_HANDLES]; ///< array of filenames we (should) have open
uint usage_count[MAX_HANDLES]; ///< count how many times this file has been opened
#endif /* LIMITED_FDS */
};
static Fio _fio;
/* Get current position in file */
uint32 FioGetPos()
{
return _fio.pos + (_fio.buffer - _fio.buffer_start) - FIO_BUFFER_SIZE;
}
void FioSeekTo(uint32 pos, int mode)
{
if (mode == SEEK_CUR) pos += FioGetPos();
_fio.buffer = _fio.buffer_end = _fio.buffer_start + FIO_BUFFER_SIZE;
_fio.pos = pos;
fseek(_fio.cur_fh, _fio.pos, SEEK_SET);
}
#if defined(LIMITED_FDS)
static void FioRestoreFile(int slot)
{
/* Do we still have the file open, or should we reopen it? */
if (_fio.handles[slot] == NULL) {
DEBUG(misc, 6, "Restoring file '%s' in slot '%d' from disk", _fio.filename[slot], slot);
FioOpenFile(slot, _fio.filename[slot]);
}
_fio.usage_count[slot]++;
}
#endif /* LIMITED_FDS */
/* Seek to a file and a position */
void FioSeekToFile(uint32 pos)
{
FILE *f;
#if defined(LIMITED_FDS)
/* Make sure we have this file open */
FioRestoreFile(pos >> 24);
#endif /* LIMITED_FDS */
f = _fio.handles[pos >> 24];
assert(f != NULL);
_fio.cur_fh = f;
FioSeekTo(GB(pos, 0, 24), SEEK_SET);
}
byte FioReadByte()
{
if (_fio.buffer == _fio.buffer_end) {
_fio.pos += FIO_BUFFER_SIZE;
fread(_fio.buffer = _fio.buffer_start, 1, FIO_BUFFER_SIZE, _fio.cur_fh);
}
return *_fio.buffer++;
}
void FioSkipBytes(int n)
{
for (;;) {
int m = min(_fio.buffer_end - _fio.buffer, n);
_fio.buffer += m;
n -= m;
if (n == 0) break;
FioReadByte();
n--;
}
}
uint16 FioReadWord()
{
byte b = FioReadByte();
return (FioReadByte() << 8) | b;
}
uint32 FioReadDword()
{
uint b = FioReadWord();
return (FioReadWord() << 16) | b;
}
void FioReadBlock(void *ptr, uint size)
{
FioSeekTo(FioGetPos(), SEEK_SET);
_fio.pos += size;
fread(ptr, 1, size, _fio.cur_fh);
}
static inline void FioCloseFile(int slot)
{
if (_fio.handles[slot] != NULL) {
fclose(_fio.handles[slot]);
_fio.handles[slot] = NULL;
#if defined(LIMITED_FDS)
_fio.open_handles--;
#endif /* LIMITED_FDS */
}
}
void FioCloseAll()
{
int i;
for (i = 0; i != lengthof(_fio.handles); i++)
FioCloseFile(i);
}
#if defined(LIMITED_FDS)
static void FioFreeHandle()
{
/* If we are about to open a file that will exceed the limit, close a file */
if (_fio.open_handles + 1 == LIMITED_FDS) {
uint i, count;
int slot;
count = UINT_MAX;
slot = -1;
/* Find the file that is used the least */
for (i = 0; i < lengthof(_fio.handles); i++) {
if (_fio.handles[i] != NULL && _fio.usage_count[i] < count) {
count = _fio.usage_count[i];
slot = i;
}
}
assert(slot != -1);
DEBUG(misc, 6, "Closing filehandler '%s' in slot '%d' because of fd-limit", _fio.filename[slot], slot);
FioCloseFile(slot);
}
}
#endif /* LIMITED_FDS */
void FioOpenFile(int slot, const char *filename)
{
FILE *f;
#if defined(LIMITED_FDS)
FioFreeHandle();
#endif /* LIMITED_FDS */
f = FioFOpenFile(filename);
if (f == NULL) error("Cannot open file '%s%s'", _paths.data_dir, filename);
FioCloseFile(slot); // if file was opened before, close it
_fio.handles[slot] = f;
#if defined(LIMITED_FDS)
_fio.filename[slot] = filename;
_fio.usage_count[slot] = 0;
_fio.open_handles++;
#endif /* LIMITED_FDS */
FioSeekToFile(slot << 24);
}
/**
* Check whether the given file exists
* @param filename the file to try for existance
* @return true if and only if the file can be opened
*/
bool FioCheckFileExists(const char *filename)
{
FILE *f = FioFOpenFile(filename);
if (f == NULL) return false;
fclose(f);
return true;
}
/**
* Opens the file with the given name
* @param filename the file to open (in either data_dir or second_data_dir)
* @return the opened file or NULL when it failed.
*/
FILE *FioFOpenFile(const char *filename)
{
FILE *f;
char buf[MAX_PATH];
snprintf(buf, lengthof(buf), "%s%s", _paths.data_dir, filename);
f = fopen(buf, "rb");
#if !defined(WIN32)
if (f == NULL) {
strtolower(buf + strlen(_paths.data_dir) - 1);
f = fopen(buf, "rb");
#if defined SECOND_DATA_DIR
/* tries in the 2nd data directory */
if (f == NULL) {
snprintf(buf, lengthof(buf), "%s%s", _paths.second_data_dir, filename);
strtolower(buf + strlen(_paths.second_data_dir) - 1);
f = fopen(buf, "rb");
}
#endif
}
#endif
return f;
}
/**
* Create a directory with the given name
* @param name the new name of the directory
*/
void FioCreateDirectory(const char *name)
{
#if defined(WIN32) || defined(WINCE)
CreateDirectory(OTTD2FS(name), NULL);
#elif defined(OS2) && !defined(__INNOTEK_LIBC__)
mkdir(OTTD2FS(name));
#else
mkdir(OTTD2FS(name), 0755);
#endif
}
/**
* Appends, if necessary, the path separator character to the end of the string.
* It does not add the path separator to zero-sized strings.
* @param buf string to append the separator to
* @param buflen the length of the buf
*/
void AppendPathSeparator(char *buf, size_t buflen)
{
size_t s = strlen(buf);
/* Length of string + path separator + '\0' */
if (s != 0 && buf[s - 1] != PATHSEPCHAR && s + 2 < buflen) {
buf[s] = PATHSEPCHAR;
buf[s + 1] = '\0';
}
}
#if defined(WIN32) || defined(WINCE)
/**
* Determine the base (personal dir and game data dir) paths
* @param exe the path to the executable
*/
extern void DetermineBasePaths(const char *exe);
#else /* defined(WIN32) || defined(WINCE) */
/**
* Changes the working directory to the path of the give executable.
* For OSX application bundles '.app' is the required extension of the bundle,
* so when we crop the path to there, when can remove the name of the bundle
* in the same way we remove the name from the executable name.
* @param exe the path to the executable
*/
void ChangeWorkingDirectory(const char *exe)
{
#ifdef WITH_COCOA
char *app_bundle = strchr(exe, '.');
while (app_bundle != NULL && strncasecmp(app_bundle, ".app", 4) != 0) app_bundle = strchr(&app_bundle[1], '.');
if (app_bundle != NULL) app_bundle[0] = '\0';
#endif /* WITH_COCOA */
char *s = strrchr(exe, PATHSEPCHAR);
if (s != NULL) {
*s = '\0';
chdir(exe);
*s = PATHSEPCHAR;
}
#ifdef WITH_COCOA
if (app_bundle != NULL) app_bundle[0] = '.';
#endif /* WITH_COCOA */
}
/**
* Determine the base (personal dir and game data dir) paths
* @param exe the path to the executable
*/
void DetermineBasePaths(const char *exe)
{
/* Change the working directory to enable doubleclicking in UIs */
ChangeWorkingDirectory(exe);
_paths.game_data_dir = MallocT<char>(MAX_PATH);
ttd_strlcpy(_paths.game_data_dir, GAME_DATA_DIR, MAX_PATH);
#if defined(SECOND_DATA_DIR)
_paths.second_data_dir = MallocT<char>(MAX_PATH);
ttd_strlcpy(_paths.second_data_dir, SECOND_DATA_DIR, MAX_PATH);
#endif
#if defined(USE_HOMEDIR)
const char *homedir = getenv("HOME");
if (homedir == NULL) {
const struct passwd *pw = getpwuid(getuid());
if (pw != NULL) homedir = pw->pw_dir;
}
_paths.personal_dir = str_fmt("%s" PATHSEP "%s", homedir, PERSONAL_DIR);
#else /* not defined(USE_HOMEDIR) */
_paths.personal_dir = MallocT<char>(MAX_PATH);
ttd_strlcpy(_paths.personal_dir, PERSONAL_DIR, MAX_PATH);
/* check if absolute or relative path */
const char *s = strchr(_paths.personal_dir, PATHSEPCHAR);
/* add absolute path */
if (s == NULL || _paths.personal_dir != s) {
getcwd(_paths.personal_dir, MAX_PATH);
AppendPathSeparator(_paths.personal_dir, MAX_PATH);
ttd_strlcat(_paths.personal_dir, PERSONAL_DIR, MAX_PATH);
}
#endif /* defined(USE_HOMEDIR) */
AppendPathSeparator(_paths.personal_dir, MAX_PATH);
AppendPathSeparator(_paths.game_data_dir, MAX_PATH);
}
#endif /* defined(WIN32) || defined(WINCE) */
/**
* Acquire the base paths (personal dir and game data dir),
* fill all other paths (save dir, autosave dir etc) and
* make the save and scenario directories.
* @param exe the path to the executable
* @todo for save_dir, autosave_dir, scenario_dir and heightmap_dir the
* assumption is that there is no path separator, however for gm_dir
* lang_dir and data_dir that assumption is made.
* This inconsistency should be resolved.
*/
void DeterminePaths(const char *exe)
{
DetermineBasePaths(exe);
_paths.save_dir = str_fmt("%ssave", _paths.personal_dir);
_paths.autosave_dir = str_fmt("%s" PATHSEP "autosave", _paths.save_dir);
_paths.scenario_dir = str_fmt("%sscenario", _paths.personal_dir);
_paths.heightmap_dir = str_fmt("%s" PATHSEP "heightmap", _paths.scenario_dir);
_paths.gm_dir = str_fmt("%sgm" PATHSEP, _paths.game_data_dir);
_paths.data_dir = str_fmt("%sdata" PATHSEP, _paths.game_data_dir);
#if defined(CUSTOM_LANG_DIR)
/* Sets the search path for lng files to the custom one */
_paths.lang_dir = MallocT<char>(MAX_PATH);
ttd_strlcpy(_paths.lang_dir, CUSTOM_LANG_DIR, MAX_PATH);
AppendPathSeparator(_paths.lang_dir, MAX_PATH);
#else
_paths.lang_dir = str_fmt("%slang" PATHSEP, _paths.game_data_dir);
#endif
if (_config_file == NULL) {
_config_file = str_fmt("%sopenttd.cfg", _paths.personal_dir);
}
_highscore_file = str_fmt("%shs.dat", _paths.personal_dir);
_log_file = str_fmt("%sopenttd.log", _paths.personal_dir);
/* Make (auto)save and scenario folder */
FioCreateDirectory(_paths.save_dir);
FioCreateDirectory(_paths.autosave_dir);
FioCreateDirectory(_paths.scenario_dir);
FioCreateDirectory(_paths.heightmap_dir);
}
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