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H5system.c
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H5system.c
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF5. The full HDF5 copyright notice, including *
* terms governing use, modification, and redistribution, is contained in *
* the LICENSE file, which can be found at the root of the source code *
* distribution tree, or in https://www.hdfgroup.org/licenses. *
* If you do not have access to either file, you may request a copy from *
* help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*-------------------------------------------------------------------------
*
* Created: H5system.c
*
* Purpose: System call wrapper implementations.
*
*-------------------------------------------------------------------------
*/
/****************/
/* Module Setup */
/****************/
#include "H5module.h" /* This source code file is part of the H5 module */
/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions */
#include "H5Eprivate.h" /* Error handling */
#include "H5Fprivate.h" /* File access */
#include "H5MMprivate.h" /* Memory management */
/****************/
/* Local Macros */
/****************/
/******************/
/* Local Typedefs */
/******************/
/********************/
/* Package Typedefs */
/********************/
/********************/
/* Local Prototypes */
/********************/
/*********************/
/* Package Variables */
/*********************/
/*****************************/
/* Library Private Variables */
/*****************************/
/*******************/
/* Local Variables */
/*******************/
/* Track whether tzset routine was called */
static bool H5_ntzset = false;
#ifndef H5_HAVE_VASPRINTF
/* HDvasprintf provides vasprintf-like function on targets where it is
* unavailable.
*/
int
HDvasprintf(char **bufp, const char *fmt, va_list _ap)
{
char *buf; /* buffer to receive formatted string */
size_t bufsz; /* size of buffer to allocate */
for (bufsz = 32; (buf = malloc(bufsz)) != NULL;) {
int ret;
va_list ap;
va_copy(ap, _ap);
ret = vsnprintf(buf, bufsz, fmt, ap);
va_end(ap);
if (ret >= 0 && (size_t)ret < bufsz) {
*bufp = buf;
return ret;
}
free(buf);
if (ret < 0)
return ret;
bufsz = (size_t)ret + 1;
}
return -1;
}
#endif /* H5_HAVE_VASPRINTF */
/*-------------------------------------------------------------------------
* Function: Pflock
*
* Purpose: Wrapper function for POSIX systems where flock(2) is not
* available.
*
* Return: Success: 0
* Failure: -1
*
*-------------------------------------------------------------------------
*/
/* NOTE: Compile this all the time on POSIX systems, even when flock(2) is
* present so that it's less likely to become dead code.
*/
#ifdef H5_HAVE_FCNTL
int
Pflock(int fd, int operation)
{
struct flock flk;
/* Set the lock type */
if (operation & LOCK_UN)
flk.l_type = F_UNLCK;
else if (operation & LOCK_SH)
flk.l_type = F_RDLCK;
else
flk.l_type = F_WRLCK;
/* Set the other flock struct values */
flk.l_whence = SEEK_SET;
flk.l_start = 0;
flk.l_len = 0; /* to EOF */
flk.l_pid = 0; /* not used with set */
/* Lock or unlock */
if (fcntl(fd, F_SETLK, &flk) < 0)
return -1;
return 0;
} /* end Pflock() */
#endif /* H5_HAVE_FCNTL */
/*-------------------------------------------------------------------------
* Function: Nflock
*
* Purpose: Wrapper function for systems where no file locking is
* available.
*
* Return: 0 (success)
*
*-------------------------------------------------------------------------
*/
int H5_ATTR_CONST
Nflock(int H5_ATTR_UNUSED fd, int H5_ATTR_UNUSED operation)
{
/* just succeed */
return 0;
} /* end Nflock() */
/*-------------------------------------------------------------------------
* Function: H5_make_time
*
* Purpose: Portability routine to abstract converting a 'tm' struct into
* a time_t value.
*
* Note: This is a little problematic because mktime() operates on
* local times. We convert to local time and then figure out the
* adjustment based on the local time zone and daylight savings
* setting.
*
* Return: Success: The value of timezone
* Failure: -1
*
*-------------------------------------------------------------------------
*/
time_t
H5_make_time(struct tm *tm)
{
time_t the_time; /* The converted time */
#if defined(H5_HAVE_VISUAL_STUDIO)
long timezone = 0;
#endif
time_t ret_value = 0; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
/* Sanity check */
assert(tm);
/* Initialize timezone information */
if (!H5_ntzset) {
tzset();
H5_ntzset = true;
}
/* Perform base conversion */
if ((time_t)-1 == (the_time = mktime(tm)))
HGOTO_ERROR(H5E_INTERNAL, H5E_CANTCONVERT, FAIL, "badly formatted modification time message");
/* Adjust for timezones */
#if defined(H5_HAVE_TM_GMTOFF)
/* BSD-like systems */
the_time += tm->tm_gmtoff;
#elif defined(H5_HAVE_TIMEZONE)
#if defined(H5_HAVE_VISUAL_STUDIO)
_get_timezone(&timezone);
#endif
the_time -= timezone - (tm->tm_isdst ? 3600 : 0);
#else
/*
* The catch-all. If we can't convert a character string universal
* coordinated time to a time_t value reliably then we can't decode the
* modification time message. This really isn't as bad as it sounds -- the
* only way a user can get the modification time is from our internal
* query routines, which can gracefully recover.
*/
HGOTO_ERROR(H5E_INTERNAL, H5E_UNSUPPORTED, FAIL, "unable to obtain local timezone information");
#endif
/* Set return value */
ret_value = the_time;
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_make_time() */
#ifdef H5_HAVE_WIN32_API
/* Offset between 1/1/1601 and 1/1/1970 in 100 nanosecond units */
#define _W32_FT_OFFSET (116444736000000000ULL)
/*-------------------------------------------------------------------------
* Function: Wgettimeofday
*
* Purpose: Wrapper function for gettimeofday on Windows systems
*
* This function can get the time as well as a timezone
*
* Return: 0
*
* This implementation is taken from the Cygwin source distribution at
* src/winsup/mingw/mingwex/gettimeofday.c
*
* The original source code was contributed by
* Danny Smith <dannysmith@users.sourceforge.net>
* and released in the public domain.
*
*-------------------------------------------------------------------------
*/
int
Wgettimeofday(struct timeval *tv, struct timezone *tz)
{
union {
unsigned long long ns100; /*time since 1 Jan 1601 in 100ns units */
FILETIME ft;
} _now;
static int tzsetflag;
if (tv) {
GetSystemTimeAsFileTime(&_now.ft);
tv->tv_usec = (long)((_now.ns100 / 10ULL) % 1000000ULL);
tv->tv_sec = (long)((_now.ns100 - _W32_FT_OFFSET) / 10000000ULL);
}
if (tz) {
if (!tzsetflag) {
_tzset();
tzsetflag = 1;
}
tz->tz_minuteswest = _timezone / 60;
tz->tz_dsttime = _daylight;
}
/* Always return 0 as per Open Group Base Specifications Issue 6.
Do not set errno on error. */
return 0;
} /* end Wgettimeofday() */
/*-------------------------------------------------------------------------
* Function: Wsetenv
*
* Purpose: Wrapper function for setenv on Windows systems.
* Interestingly, getenv *is* available in the Windows
* POSIX layer, just not setenv.
*
* Note: Passing an empty string ("") for the value will remove
* the variable from the environment (like unsetenv(3))
*
* Return: Success: 0
* Failure: non-zero error code
*
*-------------------------------------------------------------------------
*/
int
Wsetenv(const char *name, const char *value, int overwrite)
{
/* If we're not overwriting, check if the environment variable exists.
* If it does (i.e.: the required buffer size to store the variable's
* value is non-zero), then return an error code.
*/
if (!overwrite) {
#ifndef H5_HAVE_MINGW
size_t bufsize;
errno_t err;
err = getenv_s(&bufsize, NULL, 0, name);
if (err || bufsize)
return (int)err;
#else
/* MinGW doesn't have getenv_s() */
char *test = getenv(name);
if (*test)
return FAIL;
#endif
}
return (int)_putenv_s(name, value);
} /* end Wsetenv() */
#ifdef H5_HAVE_WIN32_API
#pragma comment(lib, "advapi32.lib")
#endif
/*-------------------------------------------------------------------------
* Function: H5_get_win32_times
*
* Purpose: Gets the elapsed, system and user times on Windows platforms.
* All time values are in seconds.
*
* Return: Success: 0
* Failure: -1
*
*-------------------------------------------------------------------------
*/
#ifdef H5_HAVE_WIN32_API
int
H5_get_win32_times(H5_timevals_t *tvs /*in,out*/)
{
static HANDLE process_handle;
ULARGE_INTEGER kernel_start;
ULARGE_INTEGER user_start;
FILETIME KernelTime;
FILETIME UserTime;
FILETIME CreationTime;
FILETIME ExitTime;
LARGE_INTEGER counts_start;
static LARGE_INTEGER counts_freq;
static bool is_initialized = false;
BOOL err;
assert(tvs);
if (!is_initialized) {
/* NOTE: This is just a pseudo handle and does not need to be closed. */
process_handle = GetCurrentProcess();
err = QueryPerformanceFrequency(&counts_freq);
if (0 == err)
return -1;
is_initialized = true;
} /* end if */
/*************************
* System and user times *
*************************/
err = GetProcessTimes(process_handle, &CreationTime, &ExitTime, &KernelTime, &UserTime);
if (0 == err)
return -1;
/* The 1.0E7 factor seems strange but it's due to the clock
* ticking in 100 ns increments.
*/
kernel_start.HighPart = KernelTime.dwHighDateTime;
kernel_start.LowPart = KernelTime.dwLowDateTime;
tvs->system = (double)(kernel_start.QuadPart / 1.0E7F);
user_start.HighPart = UserTime.dwHighDateTime;
user_start.LowPart = UserTime.dwLowDateTime;
tvs->user = (double)(user_start.QuadPart / 1.0E7F);
/****************
* Elapsed time *
****************/
err = QueryPerformanceCounter(&counts_start);
if (0 == err)
return -1;
tvs->elapsed = (double)(counts_start.QuadPart) / (double)counts_freq.QuadPart;
return 0;
} /* end H5_get_win32_times() */
#endif
/*-------------------------------------------------------------------------
* Function: Wflock
*
* Purpose: Wrapper function for flock on Windows systems
*
* Return: Success: 0
* Failure: -1
*
*-------------------------------------------------------------------------
*/
int
Wflock(int fd, int operation)
{
HANDLE hFile;
DWORD dwFlags = LOCKFILE_FAIL_IMMEDIATELY;
DWORD dwReserved = 0;
/* MAXDWORD locks the entire file */
DWORD nNumberOfBytesToLockLow = MAXDWORD;
DWORD nNumberOfBytesToLockHigh = MAXDWORD;
/* Must initialize OVERLAPPED struct */
OVERLAPPED overlapped = {0};
/* Get Windows HANDLE */
if (INVALID_HANDLE_VALUE == (hFile = (HANDLE)_get_osfhandle(fd)))
return -1;
/* Convert to Windows flags */
if (operation & LOCK_EX)
dwFlags |= LOCKFILE_EXCLUSIVE_LOCK;
/* Lock or unlock */
if (operation & LOCK_UN) {
if (0 ==
UnlockFileEx(hFile, dwReserved, nNumberOfBytesToLockLow, nNumberOfBytesToLockHigh, &overlapped)) {
/* Attempting to unlock an already unlocked file will fail and this can happen
* in H5Fstart_swmr_write(). For now, just ignore the "error" (error code: 0x9e / 158).
*/
if (GetLastError() != 158)
return -1;
}
}
else {
if (0 == LockFileEx(hFile, dwFlags, dwReserved, nNumberOfBytesToLockLow, nNumberOfBytesToLockHigh,
&overlapped))
return -1;
}
return 0;
} /* end Wflock() */
/*-------------------------------------------------------------------------
* Function: H5_get_utf16_str
*
* Purpose: Gets a UTF-16 string from an UTF-8 (or ASCII) string.
*
* Return: Success: A pointer to a UTF-16 string
* This must be freed by the caller using H5MM_xfree()
* Failure: NULL
*
*-------------------------------------------------------------------------
*/
wchar_t *
H5_get_utf16_str(const char *s)
{
int nwchars = -1; /* Length of the UTF-16 buffer */
wchar_t *ret_s = NULL; /* UTF-16 version of the string */
/* Get the number of UTF-16 characters needed */
if (0 == (nwchars = MultiByteToWideChar(CP_UTF8, 0, s, -1, NULL, 0)))
goto error;
/* Allocate a buffer for the UTF-16 string */
if (NULL == (ret_s = (wchar_t *)H5MM_calloc(sizeof(wchar_t) * (size_t)nwchars)))
goto error;
/* Convert the input UTF-8 string to UTF-16 */
if (0 == MultiByteToWideChar(CP_UTF8, 0, s, -1, ret_s, nwchars))
goto error;
return ret_s;
error:
if (ret_s)
H5MM_xfree((void *)ret_s);
return NULL;
} /* end H5_get_utf16_str() */
/*-------------------------------------------------------------------------
* Function: Wopen
*
* Purpose: Equivalent of open(2) for use on Windows. Necessary to
* handle code pages and Unicode on that platform.
*
* Return: Success: A POSIX file descriptor
* Failure: -1
*-------------------------------------------------------------------------
*/
int
Wopen(const char *path, int oflag, ...)
{
int fd = -1; /* POSIX file descriptor to be returned */
wchar_t *wpath = NULL; /* UTF-16 version of the path */
int pmode = 0; /* mode (optionally set via variable args) */
/* _O_BINARY must be set in Windows to avoid CR-LF <-> LF EOL
* transformations when performing I/O. Note that this will
* produce Unix-style text files, though.
*/
oflag |= _O_BINARY;
/* Get the mode, if O_CREAT was specified */
if (oflag & O_CREAT) {
va_list vl;
va_start(vl, oflag);
pmode = va_arg(vl, int);
va_end(vl);
}
/* First try opening the file with the normal POSIX open() call.
* This will handle ASCII without additional processing as well as
* systems where code pages are being used instead of true Unicode.
*/
if ((fd = open(path, oflag, pmode)) >= 0) {
/* If this succeeds, we're done */
goto done;
}
if (errno == ENOENT) {
/* Not found, reset errno and try with UTF-16 */
errno = 0;
}
else {
/* Some other error (like permissions), so just exit */
goto done;
}
/* Convert the input UTF-8 path to UTF-16 */
if (NULL == (wpath = H5_get_utf16_str(path)))
goto done;
/* Open the file using a UTF-16 path */
fd = _wopen(wpath, oflag, pmode);
done:
H5MM_xfree(wpath);
return fd;
} /* end Wopen() */
/*-------------------------------------------------------------------------
* Function: Wremove
*
* Purpose: Equivalent of remove(3) for use on Windows. Necessary to
* handle code pages and Unicode on that platform.
*
* Return: Success: 0
* Failure: -1
*-------------------------------------------------------------------------
*/
int
Wremove(const char *path)
{
wchar_t *wpath = NULL; /* UTF-16 version of the path */
int ret = -1;
/* First try removing the file with the normal POSIX remove() call.
* This will handle ASCII without additional processing as well as
* systems where code pages are being used instead of true Unicode.
*/
if ((ret = remove(path)) >= 0) {
/* If this succeeds, we're done */
goto done;
}
if (errno == ENOENT) {
/* Not found, reset errno and try with UTF-16 */
errno = 0;
}
else {
/* Some other error (like permissions), so just exit */
goto done;
}
/* Convert the input UTF-8 path to UTF-16 */
if (NULL == (wpath = H5_get_utf16_str(path)))
goto done;
/* Remove the file using a UTF-16 path */
ret = _wremove(wpath);
done:
H5MM_xfree(wpath);
return ret;
} /* end Wremove() */
#endif /* H5_HAVE_WIN32_API */
/*-------------------------------------------------------------------------
* Function: H5_build_extpath
*
* Purpose: To build the path for later searching of target file for external
* links and external files. This path can be either:
* 1. The absolute path of NAME
* or
* 2. The current working directory + relative path of NAME
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
#define MAX_PATH_LEN 1024
herr_t
H5_build_extpath(const char *name, char **extpath /*out*/)
{
char *full_path = NULL; /* Pointer to the full path, as built or passed in */
char *cwdpath = NULL; /* Pointer to the current working directory path */
char *new_name = NULL; /* Pointer to the name of the file */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
assert(name);
assert(extpath);
/* Clear external path pointer to begin with */
*extpath = NULL;
/*
* Unix: name[0] is a "/"
* Windows: name[0-2] is "<drive letter>:\" or "<drive-letter>:/"
*/
if (H5_CHECK_ABSOLUTE(name)) {
if (NULL == (full_path = (char *)H5MM_strdup(name)))
HGOTO_ERROR(H5E_INTERNAL, H5E_NOSPACE, FAIL, "memory allocation failed");
}
else {
/* relative pathname */
char *retcwd;
size_t name_len;
int drive;
if (NULL == (cwdpath = (char *)H5MM_malloc(MAX_PATH_LEN)))
HGOTO_ERROR(H5E_INTERNAL, H5E_NOSPACE, FAIL, "memory allocation failed");
name_len = strlen(name) + 1;
if (NULL == (new_name = (char *)H5MM_malloc(name_len)))
HGOTO_ERROR(H5E_INTERNAL, H5E_NOSPACE, FAIL, "memory allocation failed");
/*
* Windows: name[0-1] is "<drive-letter>:"
* Get current working directory on the drive specified in NAME
* Unix: does not apply
*/
if (H5_CHECK_ABS_DRIVE(name)) {
drive = toupper(name[0]) - 'A' + 1;
retcwd = HDgetdcwd(drive, cwdpath, MAX_PATH_LEN);
strncpy(new_name, &name[2], name_len);
}
/*
* Windows: name[0] is a '/' or '\'
* Get current drive
* Unix: does not apply
*/
else if (H5_CHECK_ABS_PATH(name) && (0 != (drive = HDgetdrive()))) {
snprintf(cwdpath, MAX_PATH_LEN, "%c:%c", (drive + 'A' - 1), name[0]);
retcwd = cwdpath;
strncpy(new_name, &name[1], name_len);
}
/* totally relative for Unix and Windows: get current working directory */
else {
retcwd = HDgetcwd(cwdpath, MAX_PATH_LEN);
strncpy(new_name, name, name_len);
}
if (retcwd != NULL) {
size_t cwdlen;
size_t path_len;
cwdlen = strlen(cwdpath);
if (cwdlen == 0)
HGOTO_ERROR(H5E_INTERNAL, H5E_BADVALUE, FAIL, "cwd length is zero");
path_len = cwdlen + strlen(new_name) + 2;
if (NULL == (full_path = (char *)H5MM_malloc(path_len)))
HGOTO_ERROR(H5E_INTERNAL, H5E_NOSPACE, FAIL, "memory allocation failed");
/* path_len will always be greater than zero, so no check before
* setting the terminal NUL byte of full_path
*/
strncpy(full_path, cwdpath, path_len);
full_path[path_len - 1] = '\0';
if (!H5_CHECK_DELIMITER(cwdpath[cwdlen - 1]))
strncat(full_path, H5_DIR_SEPS, path_len - (cwdlen + 1));
strncat(full_path, new_name, path_len - (cwdlen + 1) - strlen(H5_DIR_SEPS));
}
}
/* Strip out the last component (the file name itself) from the path */
if (full_path) {
char *ptr = NULL;
H5_GET_LAST_DELIMITER(full_path, ptr)
assert(ptr);
*++ptr = '\0';
*extpath = full_path;
}
done:
if (cwdpath)
H5MM_xfree(cwdpath);
if (new_name)
H5MM_xfree(new_name);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_build_extpath() */
/*--------------------------------------------------------------------------
* Function: H5_combine_path
*
* Purpose: If path2 is relative, interpret path2 as relative to path1
* and store the result in full_name. Otherwise store path2
* in full_name.
*
* Return: SUCCEED/FAIL
*
*--------------------------------------------------------------------------
*/
herr_t
H5_combine_path(const char *path1, const char *path2, char **full_name /*out*/)
{
size_t path1_len = 0; /* length of path1 */
size_t path2_len; /* length of path2 */
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
assert(path2);
if (path1)
path1_len = strlen(path1);
path2_len = strlen(path2);
if (path1 == NULL || *path1 == '\0' || H5_CHECK_ABSOLUTE(path2)) {
/* If path1 is empty or path2 is absolute, simply use path2 */
if (NULL == (*full_name = (char *)H5MM_strdup(path2)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
} /* end if */
else if (H5_CHECK_ABS_PATH(path2)) {
/* On windows path2 is a path absolute name */
if (H5_CHECK_ABSOLUTE(path1) || H5_CHECK_ABS_DRIVE(path1)) {
/* path1 is absolute or drive absolute and path2 is path absolute.
* Use the drive letter of path1 + path2
*/
if (NULL == (*full_name = (char *)H5MM_malloc(path2_len + 3)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "unable to allocate path2 buffer");
snprintf(*full_name, (path2_len + 3), "%c:%s", path1[0], path2);
} /* end if */
else {
/* On windows path2 is path absolute name ("\foo\bar"),
* path1 does not have a drive letter (i.e. is "a\b" or "\a\b").
* Use path2.
*/
if (NULL == (*full_name = (char *)H5MM_strdup(path2)))
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
} /* end else */
} /* end else if */
else {
/* Relative path2:
* Allocate a buffer to hold path1 + path2 + possibly the delimiter
* + terminating null byte
*/
if (NULL ==
(*full_name = (char *)H5MM_malloc(path1_len + path2_len + 2 +
2))) /* Extra "+2" to quiet GCC warning - 2019/07/05, QAK */
HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "unable to allocate filename buffer");
/* Compose the full file name */
snprintf(*full_name, (path1_len + path2_len + 2 + 2), "%s%s%s",
path1, /* Extra "+2" to quiet GCC warning - 2019/07/05, QAK */
(H5_CHECK_DELIMITER(path1[path1_len - 1]) ? "" : H5_DIR_SEPS), path2);
} /* end else */
done:
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_combine_path() */
/*--------------------------------------------------------------------------
* Function: H5_nanosleep
*
* Purpose: Sleep for a given # of nanoseconds
*
* Note that commodity hardware is probably going to have a
* resolution of milliseconds, not nanoseconds.
*
* Return: void
*--------------------------------------------------------------------------
*/
void
H5_nanosleep(uint64_t nanosec)
{
FUNC_ENTER_NOAPI_NOINIT_NOERR
#ifdef H5_HAVE_WIN32_API
DWORD dwMilliseconds = (DWORD)ceil(nanosec / 1.0e6);
/* Windows can't sleep at a ns resolution. Best we can do is ~1 ms. We
* don't care about the return value since the second parameter
* (bAlertable) is false, so it will always be zero.
*/
SleepEx(dwMilliseconds, false);
#else
const uint64_t nanosec_per_sec = 1000 * 1000L * 1000;
struct timespec sleeptime; /* Struct to hold time to sleep */
/* Set up time to sleep
*
* Assuming ILP32 or LP64 or wider architecture, (long)operand
* satisfies 0 <= operand < nanosec_per_sec < LONG_MAX.
*
* It's harder to be sure that we don't overflow time_t.
*/
sleeptime.tv_sec = (time_t)(nanosec / nanosec_per_sec);
sleeptime.tv_nsec = (long)(nanosec % nanosec_per_sec);
/* Sleep for up to `sleeptime` and, in the event of an interruption,
* save the unslept time back to `sleeptime`.
*/
while (HDnanosleep(&sleeptime, &sleeptime) == -1) {
/* If we were just interrupted, sleep for the remaining time.
* Otherwise, the error was essentially impossible, so just stop
* sleeping.
*/
if (errno != EINTR)
break;
}
#endif
FUNC_LEAVE_NOAPI_VOID
} /* end H5_nanosleep() */
#ifdef H5_HAVE_WIN32_API
#define H5_WIN32_ENV_VAR_BUFFER_SIZE 32767
/*-------------------------------------------------------------------------
* Function: H5_expand_windows_env_vars()
*
* Purpose: Replaces windows environment variables of the form %foo%
* with user-specific values.
*
* Return: SUCCEED/FAIL
*
*-------------------------------------------------------------------------
*/
herr_t
H5_expand_windows_env_vars(char **env_var)
{
long n_chars = 0;
char *temp_buf = NULL;
herr_t ret_value = SUCCEED; /* Return value */
FUNC_ENTER_NOAPI_NOINIT
/* Allocate buffer for expanded environment variable string */
if (NULL == (temp_buf = (char *)H5MM_calloc((size_t)H5_WIN32_ENV_VAR_BUFFER_SIZE)))
HGOTO_ERROR(H5E_PLUGIN, H5E_CANTALLOC, FAIL, "can't allocate memory for expanded path");
/* Expand the environment variable string */
if ((n_chars = ExpandEnvironmentStringsA(*env_var, temp_buf, H5_WIN32_ENV_VAR_BUFFER_SIZE)) >
H5_WIN32_ENV_VAR_BUFFER_SIZE)
HGOTO_ERROR(H5E_PLUGIN, H5E_NOSPACE, FAIL, "expanded path is too long");
if (0 == n_chars)
HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "failed to expand path");
*env_var = (char *)H5MM_xfree(*env_var);
*env_var = temp_buf;
done:
if (FAIL == ret_value && temp_buf)
temp_buf = (char *)H5MM_xfree(temp_buf);
FUNC_LEAVE_NOAPI(ret_value)
} /* end H5_expand_windows_env_vars() */
/*-------------------------------------------------------------------------
* Function: H5_strndup
*
* Purpose: Similar to strndup() for use on Windows. Allocates a new
* string and copies at most `n` bytes from the original
* string into the new string. If the original string is
* longer than `n`, only `n` bytes are copied from the
* original string. In either case, the string being returned
* is guaranteed to be terminated with a null byte.
*
* The returned pointer is allocated by H5MM_malloc in this
* routine and must be freed by the caller with H5MM_free or
* H5MM_xfree.
*
* Return: Pointer to copied string on success
* NULL on failure
*
*-------------------------------------------------------------------------
*/
char *
H5_strndup(const char *s, size_t n)
{
size_t len;
char *ret_value = NULL;
FUNC_ENTER_NOAPI_NOINIT
if (!s)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "string cannot be NULL");
for (len = 0; len < n && s[len] != '\0'; len++)
;
if (NULL == (ret_value = H5MM_malloc(len + 1)))
HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, NULL, "can't allocate buffer for string");
H5MM_memcpy(ret_value, s, len);
ret_value[len] = '\0';
done:
FUNC_LEAVE_NOAPI(ret_value)
}
/*-------------------------------------------------------------------------
* Function: Wstrcasestr_wrap
*
* Purpose: Windows wrapper function for strcasestr to retain GNU
* behavior where searching for an empty substring returns the
* input string being searched. StrStrIA on Windows does not
* exhibit this same behavior.
*
* Return: Pointer to input string if 'needle' is the empty substring
* Otherwise, returns StrStrIA(haystack, needle)
*
*-------------------------------------------------------------------------
*/
char *
Wstrcasestr_wrap(const char *haystack, const char *needle)
{
if (needle && !*needle)
return (char *)haystack;
else
return StrStrIA(haystack, needle);
}
#endif /* H5_HAVE_WIN32_API */
/* dirname() and basename() are not easily ported to Windows and basename
* behavior varies depending on if you get POSIX vs. GNU. As a more
* platform-indpendent work-around, we've implemented H5_ versions of
* dirname() and basename().
*
* - The input string is never modified.
*
* - The out parameter is a new string that was allocated with H5MM routines
* and must be freed by the caller via H5MM_free()/H5MM_xfree().
*
* - NULL pointers are errors.
*
* - On errors, FAIL will be returned and the output parameter will be
* undefined.
*
* - Assumes the file separator is \ on Win32 and / everywhere else,
* including Cygwin.
*/
/*-------------------------------------------------------------------------
* Function: H5_dirname
*
* Purpose: Similar to dirname(3) but more portable across platforms.
* Returns a pointer to the directory component of a specified
* pathname. The returned pointer is allocated by this routine
* and must be freed by the caller with H5MM_free or
* H5MM_xfree.
*
* Return: Non-negative on success/Negative on failure
*
*-------------------------------------------------------------------------
*/
herr_t
H5_dirname(const char *path, char **dirname)
{
char *sep;
char *out = NULL;
herr_t ret_value = SUCCEED;
FUNC_ENTER_NOAPI_NOINIT
if (!path)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "path can't be NULL");
if (!dirname)
HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "dirname can't be NULL");