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libobs/util: Add os_safe_replace function

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Allows safely/atomically replacing a file and creating a backup of the
original.  The reason for adding this function is because Microsoft
provides a ReplaceFile function which does this in a single call.
This commit is contained in:
jp9000 2017-05-04 18:21:51 -07:00
parent 85a6d16258
commit 651d80c0df
3 changed files with 38 additions and 0 deletions
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7
libobs/util/platform-nix.c
View File

@ -432,6 +432,13 @@ int os_rename(const char *old_path, const char *new_path)
return rename(old_path, new_path);
}
int os_safe_replace(const char *target, const char *from, const char *backup)
{
if (backup && rename(target, backup) != 0)
return -1;
return rename(from, target);
}
#if !defined(__APPLE__)
os_performance_token_t *os_request_high_performance(const char *reason)
{

29
libobs/util/platform-windows.c
View File

@ -557,6 +557,35 @@ error:
return code;
}
int os_safe_replace(const char *target, const char *from, const char *backup)
{
wchar_t *wtarget = NULL;
wchar_t *wfrom = NULL;
wchar_t *wbackup = NULL;
int code = -1;
if (!target || !from)
return -1;
if (!os_utf8_to_wcs_ptr(target, 0, &wtarget))
return -1;
if (!os_utf8_to_wcs_ptr(from, 0, &wfrom))
goto fail;
if (backup && !os_utf8_to_wcs_ptr(backup, 0, &wbackup))
goto fail;
if (ReplaceFileW(wtarget, wfrom, wbackup, 0, NULL, NULL)) {
code = 0;
} else if (GetLastError() == ERROR_FILE_NOT_FOUND) {
code = MoveFile(wfrom, wtarget) ? 0 : -1;
}
fail:
bfree(wtarget);
bfree(wfrom);
bfree(wbackup);
return code;
}
BOOL WINAPI DllMain(HINSTANCE hinst_dll, DWORD reason, LPVOID reserved)
{
switch (reason) {

2
libobs/util/platform.h
View File

@ -161,6 +161,8 @@ EXPORT int os_mkdir(const char *path);
EXPORT int os_mkdirs(const char *path);
EXPORT int os_rename(const char *old_path, const char *new_path);
EXPORT int os_copyfile(const char *file_in, const char *file_out);
EXPORT int os_safe_replace(const char *target_path, const char *from_path,
const char *backup_path);
EXPORT char *os_generate_formatted_filename(const char *extension, bool space,
const char *format);