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7da0a886 SDJ |
1 | /* Perform tilde expansion on paths for GDB and gdbserver. |
2 | ||
3666a048 | 3 | Copyright (C) 2017-2021 Free Software Foundation, Inc. |
7da0a886 SDJ |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "common-defs.h" | |
d3ee35db LS |
21 | #include <algorithm> |
22 | #include "filenames.h" | |
7da0a886 SDJ |
23 | #include "gdb_tilde_expand.h" |
24 | #include <glob.h> | |
25 | ||
26 | /* RAII-style class wrapping "glob". */ | |
27 | ||
28 | class gdb_glob | |
29 | { | |
30 | public: | |
31 | /* Construct a "gdb_glob" object by calling "glob" with the provided | |
32 | parameters. This function can throw if "glob" fails. */ | |
33 | gdb_glob (const char *pattern, int flags, | |
34 | int (*errfunc) (const char *epath, int eerrno)) | |
35 | { | |
36 | int ret = glob (pattern, flags, errfunc, &m_glob); | |
37 | ||
38 | if (ret != 0) | |
39 | { | |
40 | if (ret == GLOB_NOMATCH) | |
41 | error (_("Could not find a match for '%s'."), pattern); | |
42 | else | |
43 | error (_("glob could not process pattern '%s'."), | |
44 | pattern); | |
45 | } | |
46 | } | |
47 | ||
48 | /* Destroy the object and free M_GLOB. */ | |
49 | ~gdb_glob () | |
50 | { | |
51 | globfree (&m_glob); | |
52 | } | |
53 | ||
54 | /* Return the GL_PATHC component of M_GLOB. */ | |
55 | int pathc () const | |
56 | { | |
57 | return m_glob.gl_pathc; | |
58 | } | |
59 | ||
60 | /* Return the GL_PATHV component of M_GLOB. */ | |
61 | char **pathv () const | |
62 | { | |
63 | return m_glob.gl_pathv; | |
64 | } | |
65 | ||
66 | private: | |
67 | /* The actual glob object we're dealing with. */ | |
68 | glob_t m_glob; | |
69 | }; | |
70 | ||
268a13a5 | 71 | /* See gdbsupport/gdb_tilde_expand.h. */ |
7da0a886 SDJ |
72 | |
73 | std::string | |
74 | gdb_tilde_expand (const char *dir) | |
75 | { | |
d3ee35db LS |
76 | if (dir[0] != '~') |
77 | return std::string (dir); | |
78 | ||
79 | /* This function uses glob in order to expand the ~. However, this function | |
80 | will fail to expand if the actual dir we are looking for does not exist. | |
81 | Given "~/does/not/exist", glob will fail. | |
82 | ||
83 | In order to avoid such limitation, we only use glob to expand "~" and keep | |
84 | "/does/not/exist" unchanged. | |
85 | ||
86 | Similarly, to expand ~gdb/might/not/exist, we only expand "~gdb" using | |
87 | glob and leave "/might/not/exist" unchanged. */ | |
88 | const std::string d (dir); | |
89 | ||
90 | /* Look for the first dir separator (if any) and split d around it. */ | |
91 | const auto first_sep | |
92 | = std::find_if (d.cbegin (), d.cend(), | |
93 | [] (const char c) -> bool | |
94 | { | |
95 | return IS_DIR_SEPARATOR (c); | |
96 | }); | |
97 | const std::string to_expand (d.cbegin (), first_sep); | |
98 | const std::string remainder (first_sep, d.cend ()); | |
99 | ||
100 | const gdb_glob glob (to_expand.c_str (), GLOB_TILDE_CHECK, nullptr); | |
101 | ||
102 | gdb_assert (glob.pathc () == 1); | |
103 | return std::string (glob.pathv ()[0]) + remainder; | |
7da0a886 | 104 | } |
b4987c95 | 105 | |
268a13a5 | 106 | /* See gdbsupport/gdb_tilde_expand.h. */ |
b4987c95 SDJ |
107 | |
108 | gdb::unique_xmalloc_ptr<char> | |
109 | gdb_tilde_expand_up (const char *dir) | |
110 | { | |
d3ee35db LS |
111 | const std::string expanded = gdb_tilde_expand (dir); |
112 | return make_unique_xstrdup (expanded.c_str ()); | |
b4987c95 | 113 | } |