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1 | /* Find path of executable. | |
2 | Copyright (C) 1998-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <sys/param.h> | |
23 | #include <ldsodefs.h> | |
24 | ||
25 | #include <dl-dst.h> | |
26 | ||
27 | ||
28 | const char * | |
29 | _dl_get_origin (void) | |
30 | { | |
31 | char *result = (char *) -1; | |
32 | /* We use the environment variable LD_ORIGIN_PATH. If it is set make | |
33 | a copy and strip out trailing slashes. */ | |
34 | if (GLRO(dl_origin_path) != NULL) | |
35 | { | |
36 | size_t len = strlen (GLRO(dl_origin_path)); | |
37 | result = (char *) malloc (len + 1); | |
38 | if (result == NULL) | |
39 | result = (char *) -1; | |
40 | else | |
41 | { | |
42 | char *cp = __mempcpy (result, GLRO(dl_origin_path), len); | |
43 | while (cp > result + 1 && cp[-1] == '/') | |
44 | --cp; | |
45 | *cp = '\0'; | |
46 | } | |
47 | } | |
48 | ||
49 | return result; | |
50 | } |