RTDECL(int) RTDirFlushParent(const char *pszChild)
{
char szPath[RTPATH_MAX];
int rc = RTStrCopy(szPath, sizeof(szPath), pszChild);
if (RT_SUCCESS(rc))
{
RTPathStripFilename(szPath);
rc = RTDirFlush(szPath);
}
return rc;
}
void XmlFileWriter::write(const char *pcszFilename, bool fSafe)
{
if (!fSafe)
writeInternal(pcszFilename, fSafe);
else
{
/* Empty string and directory spec must be avoid. */
if (RTPathFilename(pcszFilename) == NULL)
throw xml::LogicError(RT_SRC_POS);
/* Construct both filenames first to ease error handling. */
char szTmpFilename[RTPATH_MAX];
int rc = RTStrCopy(szTmpFilename, sizeof(szTmpFilename) - strlen(s_pszTmpSuff), pcszFilename);
if (RT_FAILURE(rc))
throw EIPRTFailure(rc, "RTStrCopy");
strcat(szTmpFilename, s_pszTmpSuff);
char szPrevFilename[RTPATH_MAX];
rc = RTStrCopy(szPrevFilename, sizeof(szPrevFilename) - strlen(s_pszPrevSuff), pcszFilename);
if (RT_FAILURE(rc))
throw EIPRTFailure(rc, "RTStrCopy");
strcat(szPrevFilename, s_pszPrevSuff);
/* Write the XML document to the temporary file. */
writeInternal(szTmpFilename, fSafe);
/* Make a backup of any existing file (ignore failure). */
uint64_t cbPrevFile;
rc = RTFileQuerySize(pcszFilename, &cbPrevFile);
if (RT_SUCCESS(rc) && cbPrevFile >= 16)
RTFileRename(pcszFilename, szPrevFilename, RTPATHRENAME_FLAGS_REPLACE);
/* Commit the temporary file. Just leave the tmp file behind on failure. */
rc = RTFileRename(szTmpFilename, pcszFilename, RTPATHRENAME_FLAGS_REPLACE);
if (RT_FAILURE(rc))
throw EIPRTFailure(rc, "Failed to replace '%s' with '%s'", pcszFilename, szTmpFilename);
/* Flush the directory changes (required on linux at least). */
RTPathStripFilename(szTmpFilename);
rc = RTDirFlush(szTmpFilename);
AssertMsg(RT_SUCCESS(rc) || rc == VERR_NOT_SUPPORTED || rc == VERR_NOT_IMPLEMENTED, ("%Rrc\n", rc));
}
}
