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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
011e0b89 | 3 | * Copyright (C) 2005, 2007 Richard Kettlewell |
460b9539 | 4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
011e0b89 RK |
20 | /** @file lib/filepart.c |
21 | * @brief Filename parsing | |
22 | */ | |
460b9539 | 23 | |
24 | #include <config.h> | |
25 | #include "types.h" | |
26 | ||
27 | #include <string.h> | |
28 | ||
29 | #include "filepart.h" | |
30 | #include "mem.h" | |
31 | ||
011e0b89 RK |
32 | /** @brief Return the directory part of @p path |
33 | * @param path Path to parse | |
34 | * @return Directory part of @p path | |
35 | * | |
36 | * Extracts the directory part of @p path. This is a simple lexical | |
37 | * transformation and no canonicalization is performed. The result will only | |
38 | * ever end "/" if it is the root directory. | |
39 | */ | |
460b9539 | 40 | char *d_dirname(const char *path) { |
41 | const char *s; | |
42 | ||
43 | if((s = strrchr(path, '/'))) { | |
011e0b89 RK |
44 | while(s > path && s[-1] == '/') |
45 | --s; | |
460b9539 | 46 | if(s == path) |
47 | return xstrdup("/"); | |
48 | else | |
49 | return xstrndup(path, s - path); | |
50 | } else | |
51 | return xstrdup("."); | |
52 | } | |
53 | ||
011e0b89 RK |
54 | /** @brief Find the extension part of @p path |
55 | * @param path Path to parse | |
56 | * @return Start of extension in @p path, or NULL | |
57 | * | |
58 | * The return value points into @p path and points at the "." at the start of | |
59 | * the path. If the basename has no extension the result is NULL. Extensions | |
60 | * are assumed to only contain the ASCII digits and letters. | |
61 | * | |
62 | * See also extension(). | |
63 | */ | |
460b9539 | 64 | static const char *find_extension(const char *path) { |
65 | const char *q = path + strlen(path); | |
66 | ||
67 | while(q > path && strchr("abcdefghijklmnopqrstuvwxyz" | |
68 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
69 | "0123456789", *q)) | |
70 | --q; | |
71 | return *q == '.' ? q : 0; | |
72 | } | |
73 | ||
011e0b89 RK |
74 | /** @brief Strip the extension from @p path |
75 | * @param path Path to parse | |
76 | * @return @p path with extension removed, or @p path | |
77 | * | |
78 | * The extension is defined exactly as for find_extension(). The result might | |
79 | * or might not point into @p path. | |
80 | */ | |
460b9539 | 81 | const char *strip_extension(const char *path) { |
82 | const char *q = find_extension(path); | |
83 | ||
84 | return q ? xstrndup(path, q - path) : path; | |
85 | } | |
86 | ||
011e0b89 RK |
87 | /** @brief Find the extension part of @p path |
88 | * @param path Path to parse | |
89 | * @return Start of extension in @p path, or "" | |
90 | * | |
91 | * The return value may points into @p path and if so points at the "." at the | |
92 | * start of the path. If the basename has no extension the result is "". | |
93 | * Extensions are assumed to only contain the ASCII digits and letters. | |
94 | * | |
95 | * See also find_extension(). | |
96 | */ | |
460b9539 | 97 | const char *extension(const char *path) { |
98 | const char *q = find_extension(path); | |
99 | ||
100 | return q ? q : ""; | |
101 | } | |
102 | ||
103 | /* | |
104 | Local Variables: | |
105 | c-basic-offset:2 | |
106 | comment-column:40 | |
107 | fill-column:79 | |
108 | indent-tabs-mode:nil | |
109 | End: | |
110 | */ |