1/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; version 2 of the License.
6
7 This program is distributed in the hope that it will be useful,
8 but WITHOUT ANY WARRANTY; without even the implied warranty of
9 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 GNU General Public License for more details.
11
12 You should have received a copy of the GNU General Public License
13 along with this program; if not, write to the Free Software
14 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
15
16#include "mysys_priv.h"
17#include <m_string.h>
18
19static char *find_file_in_path(char *to,const char *name);
20
21 /* Finds where program can find it's files.
22 pre_pathname is found by first locking at progname (argv[0]).
23 if progname contains path the path is returned.
24 else if progname is found in path, return it
25 else if progname is given and POSIX environment variable "_" is set
26 then path is taken from "_".
27 If filename doesn't contain a path append MY_BASEDIR_VERSION or
28 MY_BASEDIR if defined, else append "/my/running".
29 own_path_name_part is concatinated to result.
30 my_path puts result in to and returns to */
31
32char * my_path(char * to, const char *progname,
33 const char *own_pathname_part)
34{
35 char *start, *end, *prog;
36 size_t to_length;
37 DBUG_ENTER("my_path");
38
39 start=to; /* Return this */
40 if (progname && (dirname_part(to, progname, &to_length) ||
41 find_file_in_path(to,progname) ||
42 ((prog=getenv("_")) != 0 &&
43 dirname_part(to, prog, &to_length))))
44 {
45 (void) intern_filename(to,to);
46 if (!test_if_hard_path(to))
47 {
48 if (!my_getwd(curr_dir,FN_REFLEN,MYF(0)))
49 bchange((uchar*) to, 0, (uchar*) curr_dir, strlen(curr_dir), strlen(to)+1);
50 }
51 }
52 else
53 {
54 if ((end = getenv("MY_BASEDIR_VERSION")) == 0 &&
55 (end = getenv("MY_BASEDIR")) == 0)
56 {
57#ifdef DEFAULT_BASEDIR
58 end= (char*) DEFAULT_BASEDIR;
59#else
60 end= (char*) "/my/";
61#endif
62 }
63 (void) intern_filename(to,end);
64 to=strend(to);
65 if (to != start && to[-1] != FN_LIBCHAR)
66 *to++ = FN_LIBCHAR;
67 (void) strmov(to,own_pathname_part);
68 }
69 DBUG_PRINT("exit",("to: '%s'",start));
70 DBUG_RETURN(start);
71} /* my_path */
72
73
74 /* test if file without filename is found in path */
75 /* Returns to if found and to has dirpart if found, else NullS */
76
77#if defined(__WIN__)
78#define F_OK 0
79#define PATH_SEP ';'
80#define PROGRAM_EXTENSION ".exe"
81#else
82#define PATH_SEP ':'
83#endif
84
85static char *find_file_in_path(char *to, const char *name)
86{
87 char *path,*pos,dir[2];
88 const char *ext="";
89
90 if (!(path=getenv("PATH")))
91 return NullS;
92 dir[0]=FN_LIBCHAR; dir[1]=0;
93#ifdef PROGRAM_EXTENSION
94 if (!fn_ext(name)[0])
95 ext=PROGRAM_EXTENSION;
96#endif
97
98 for (pos=path ; (pos=strchr(pos,PATH_SEP)) ; path= ++pos)
99 {
100 if (path != pos)
101 {
102 strxmov(strnmov(to,path,(uint) (pos-path)),dir,name,ext,NullS);
103 if (!access(to,F_OK))
104 {
105 to[(uint) (pos-path)+1]=0; /* Return path only */
106 return to;
107 }
108 }
109 }
110#ifdef __WIN__
111 to[0]=FN_CURLIB;
112 strxmov(to+1,dir,name,ext,NullS);
113 if (!access(to,F_OK)) /* Test in current dir */
114 {
115 to[2]=0; /* Leave ".\" */
116 return to;
117 }
118#endif
119 return NullS; /* File not found */
120}
121