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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
#include "fileio.h"
static apr_status_t setptr(apr_file_t *thefile, unsigned long pos )
{
long 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);
}
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