freebsd-dev/contrib/apr/file_io/unix/seek.c
Peter Wemm 4705e3668d Update subversion-1.8.0 -> 1.8.1. Update supporting
components: apr-1.4.6 -> 1.4.8 and apr-util-1.4.1 -> 1.5.2.

This is a post point-zero bug-fix / fix-sharp-edges release, including
some workarounds for UTF-8 for people who haven't yet turned on WITH_ICONV.
2013-07-28 06:02:40 +00:00

130 lines
3.7 KiB
C

/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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;
apr_status_t rv;
if (thefile->direction == 1) {
rv = apr_file_flush_locked(thefile);
if (rv) {
return rv;
}
thefile->bufpos = thefile->direction = thefile->dataRead = 0;
}
newbufpos = pos - (thefile->filePtr - thefile->dataRead);
if (newbufpos >= 0 && newbufpos <= thefile->dataRead) {
thefile->bufpos = newbufpos;
rv = APR_SUCCESS;
}
else {
if (lseek(thefile->filedes, pos, SEEK_SET) != -1) {
thefile->bufpos = thefile->dataRead = 0;
thefile->filePtr = pos;
rv = APR_SUCCESS;
}
else {
rv = errno;
}
}
return rv;
}
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;
file_lock(thefile);
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_locked(&finfo, APR_FINFO_SIZE, thefile);
if (rc == APR_SUCCESS)
rc = setptr(thefile, finfo.size + *offset);
break;
}
*offset = thefile->filePtr - thefile->dataRead + thefile->bufpos;
file_unlock(thefile);
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 (fp->buffered) {
int rc = 0;
file_lock(fp);
if (fp->direction == 1 && fp->bufpos != 0) {
apr_off_t len = fp->filePtr + fp->bufpos;
if (offset < len) {
/* New file end fall below our write buffer limit.
* Figure out if and what needs to be flushed.
*/
apr_off_t off = len - offset;
if (off >= 0 && off <= fp->bufpos)
fp->bufpos = fp->bufpos - (size_t)off;
else
fp->bufpos = 0;
}
rc = apr_file_flush_locked(fp);
/* Reset buffer positions for write mode */
fp->bufpos = fp->direction = fp->dataRead = 0;
}
file_unlock(fp);
if (rc) {
return rc;
}
}
if (ftruncate(fp->filedes, offset) == -1) {
return errno;
}
return apr_file_seek(fp, APR_SET, &offset);
}