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98 lines
3.7 KiB
98 lines
3.7 KiB
/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file mysys/mf_loadpath.cc
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*/
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#include <string.h>
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#include <sys/types.h>
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#include "m_string.h"
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "my_io.h"
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#include "my_sys.h"
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/**
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Returns full load-path for a file. to may be = path.
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Pre-condition: At least FN_REFLEN bytes can be stored in buffer
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pointed to by 'to'. 'path' and 'own_path_prefix' are '\0'-terminated
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byte buffers.
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Post-condition: At most FN_REFLEN bytes will have been written to
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'to'. If the combined length of 'from' and any expanded elements
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exceeds FN_REFLEN-1, the result is truncated and likely not what the
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caller expects.
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@param to Pointer to destination which will hold the expanded path.
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@param path Pointer to buffer containing the supplied path.
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@param own_path_prefix Prefix to be appended to path.
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@retval to Pointer to the supplied destination buffer
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that will hold the full load-path.
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*/
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char *my_load_path(char *to, const char *path, const char *own_path_prefix) {
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char buff[FN_REFLEN];
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int cur_prefix_len;
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const char *buff_ptr = path;
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DBUG_TRACE;
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DBUG_PRINT("enter", ("path: %s prefix: %s", path,
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own_path_prefix ? own_path_prefix : ""));
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cur_prefix_len = (path[0] == FN_CURLIB && path[1] == FN_LIBCHAR) ? 2 : 0;
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// If path starts with current dir or parent-dir unpack path.
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if (cur_prefix_len || is_prefix(path, FN_PARENTDIR)) {
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if ((strlen(path) + cur_prefix_len) < FN_REFLEN &&
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!my_getwd(buff, (uint)(FN_REFLEN - strlen(path) + cur_prefix_len),
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MYF(0))) {
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(void)strncat(buff, path + cur_prefix_len, FN_REFLEN - strlen(buff) - 1);
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buff_ptr = buff;
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}
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}
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/*
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Prepend the path with own_path_prefix if own_path_prefix is
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specified and path doesn't start with home directory character
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and path is not a hard-path.
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If path is hard path or home dir, return the path.
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*/
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else if (own_path_prefix != NULL &&
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!(path[0] == FN_HOMELIB && path[1] == FN_LIBCHAR) &&
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!test_if_hard_path(path)) {
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(void)strxnmov(buff, sizeof(buff) - 1, own_path_prefix, path, NullS);
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buff_ptr = buff;
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}
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my_stpnmov(to, buff_ptr, FN_REFLEN);
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to[FN_REFLEN - 1] = '\0';
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DBUG_PRINT("exit", ("to: %s", to));
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return to;
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} /* my_load_path */
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