int32_t
omrfile_set_length(struct OMRPortLibrary *portLibrary, intptr_t fd, int64_t newLength)
{
int32_t lastError = 0;
int64_t currentFilePtr = 0;
Trc_PRT_file_setlength_Entry(fd, newLength);
/* Save current file pointer location */
currentFilePtr = omrfile_seek(portLibrary, fd, 0, EsSeekCur);
if ((-1 != currentFilePtr) && (-1 != omrfile_seek(portLibrary, fd, newLength, FILE_BEGIN))) {
if (0 == SetEndOfFile((HANDLE)fd)) {
lastError = GetLastError();
lastError = portLibrary->error_set_last_error(portLibrary, lastError, findError(lastError));
Trc_PRT_file_setlength_Exit(lastError);
return lastError;
}
/* Put pointer back to where it started */
if (-1 != omrfile_seek(portLibrary, fd, currentFilePtr, EsSeekSet)) {
Trc_PRT_file_setlength_Exit(0);
return 0;
}
}
/* omrfile_seek already set the last error */
lastError = portLibrary->error_last_error_number(portLibrary);
Trc_PRT_file_setlength_Exit(lastError);
return lastError;
}
/**
* Set the length of a file to a specified value.
*
* @param[in] portLibrary The port library
* @param[in] fd The file descriptor.
* @param[in] newLength Length to be set
*
* @return 0 on success, negative portable error code on failure
*/
int32_t
omrfile_set_length(struct OMRPortLibrary *portLibrary, intptr_t inFD, int64_t newLength)
{
int fd = (int)inFD;
int32_t rc;
off_t length = (off_t)newLength;
Trc_PRT_file_setlength_Entry(inFD, newLength);
/* If file offsets are 32 bit, truncate the newLength to that range */
if (sizeof(off_t) < sizeof(int64_t)) {
if (newLength > 0x7FFFFFFF) {
length = 0x7FFFFFFF;
} else if (newLength < -0x7FFFFFFF) {
length = -0x7FFFFFFF;
}
}
#if (FD_BIAS != 0)
if (fd < FD_BIAS) {
/* Cannot ftruncate on STD streams, and no other FD's should exist <FD_BIAS */
Trc_PRT_file_setlength_Exit(-1);
return -1;
}
#endif
rc = ftruncate(fd - FD_BIAS, length);
if (0 != rc) {
rc = portLibrary->error_set_last_error(portLibrary, errno, findError(errno));
}
Trc_PRT_file_setlength_Exit(rc);
return rc;
}
