/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as * applicable. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "apr_arch_file_io.h" static apr_status_t setptr(apr_file_t *thefile, apr_off_t pos ) { apr_off_t newbufpos; int rc; if (thefile->direction == 1) { apr_file_flush(thefile); thefile->bufpos = thefile->direction = thefile->dataRead = 0; } newbufpos = pos - (thefile->filePtr - thefile->dataRead); if (newbufpos >= 0 && newbufpos <= thefile->dataRead) { thefile->bufpos = newbufpos; rc = 0; } else { rc = lseek(thefile->filedes, pos, SEEK_SET); if (rc != -1 ) { thefile->bufpos = thefile->dataRead = 0; thefile->filePtr = pos; rc = 0; } else { rc = errno; } } return rc; } APR_DECLARE(apr_status_t) apr_file_seek(apr_file_t *thefile, apr_seek_where_t where, apr_off_t *offset) { apr_off_t rv; thefile->eof_hit = 0; if (thefile->buffered) { int rc = EINVAL; apr_finfo_t finfo; switch (where) { case APR_SET: rc = setptr(thefile, *offset); break; case APR_CUR: rc = setptr(thefile, thefile->filePtr - thefile->dataRead + thefile->bufpos + *offset); break; case APR_END: rc = apr_file_info_get(&finfo, APR_FINFO_SIZE, thefile); if (rc == APR_SUCCESS) rc = setptr(thefile, finfo.size + *offset); break; } *offset = thefile->filePtr - thefile->dataRead + thefile->bufpos; return rc; } else { rv = lseek(thefile->filedes, *offset, where); if (rv == -1) { *offset = -1; return errno; } else { *offset = rv; return APR_SUCCESS; } } } apr_status_t apr_file_trunc(apr_file_t *fp, apr_off_t offset) { if (ftruncate(fp->filedes, offset) == -1) { return errno; } return setptr(fp, offset); }