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/* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/mf_loadpath.cc
*/
#include <string.h>
#include <sys/types.h>
#include "m_string.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "my_sys.h"
/**
Returns full load-path for a file. to may be = path.
Pre-condition: At least FN_REFLEN bytes can be stored in buffer
pointed to by 'to'. 'path' and 'own_path_prefix' are '\0'-terminated
byte buffers.
Post-condition: At most FN_REFLEN bytes will have been written to
'to'. If the combined length of 'from' and any expanded elements
exceeds FN_REFLEN-1, the result is truncated and likely not what the
caller expects.
@param to Pointer to destination which will hold the expanded path.
@param path Pointer to buffer containing the supplied path.
@param own_path_prefix Prefix to be appended to path.
@retval to Pointer to the supplied destination buffer
that will hold the full load-path.
*/
char *my_load_path(char *to, const char *path, const char *own_path_prefix) {
char buff[FN_REFLEN];
int cur_prefix_len;
const char *buff_ptr = path;
DBUG_ENTER("my_load_path");
DBUG_PRINT("enter", ("path: %s prefix: %s", path,
own_path_prefix ? own_path_prefix : ""));
cur_prefix_len = (path[0] == FN_CURLIB && path[1] == FN_LIBCHAR) ? 2 : 0;
// If path starts with current dir or parent-dir unpack path.
if (cur_prefix_len || is_prefix(path, FN_PARENTDIR)) {
if ((strlen(path) + cur_prefix_len) < FN_REFLEN &&
!my_getwd(buff, (uint)(FN_REFLEN - strlen(path) + cur_prefix_len),
MYF(0))) {
(void)strncat(buff, path + cur_prefix_len, FN_REFLEN - strlen(buff) - 1);
buff_ptr = buff;
}
}
/*
Prepend the path with own_path_prefix if own_path_prefix is
specified and path doesn't start with home directory character
and path is not a hard-path.
If path is hard path or home dir, return the path.
*/
else if (own_path_prefix != NULL &&
!(path[0] == FN_HOMELIB && path[1] == FN_LIBCHAR) &&
!test_if_hard_path(path)) {
(void)strxnmov(buff, sizeof(buff) - 1, own_path_prefix, path, NullS);
buff_ptr = buff;
}
my_stpnmov(to, buff_ptr, FN_REFLEN);
to[FN_REFLEN - 1] = '\0';
DBUG_PRINT("exit", ("to: %s", to));
DBUG_RETURN(to);
} /* my_load_path */
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