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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
011e0b89 | 3 | * Copyright (C) 2005, 2007 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
9 | * |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
011e0b89 RK |
18 | /** @file lib/filepart.c |
19 | * @brief Filename parsing | |
20 | */ | |
460b9539 | 21 | |
05b75f8d | 22 | #include "common.h" |
460b9539 | 23 | |
24 | #include "filepart.h" | |
25 | #include "mem.h" | |
26 | ||
2257512d RK |
27 | /** @brief Parse a filename |
28 | * @param path Filename to parse | |
59cf25c4 RK |
29 | * @param dirnamep Where to put directory name, or NULL |
30 | * @param basenamep Where to put basename, or NULL | |
2257512d RK |
31 | */ |
32 | static void parse_filename(const char *path, | |
33 | char **dirnamep, | |
34 | char **basenamep) { | |
35 | const char *s, *e = path + strlen(path); | |
36 | ||
37 | /* Strip trailing slashes. We never take these into account. */ | |
38 | while(e > path && e[-1] == '/') | |
39 | --e; | |
40 | if(e == path) { | |
41 | /* The path is empty or contains only slashes */ | |
42 | if(*path) { | |
43 | if(dirnamep) | |
44 | *dirnamep = xstrdup("/"); | |
45 | if(basenamep) | |
46 | *basenamep = xstrdup("/"); | |
47 | } else { | |
48 | if(dirnamep) | |
49 | *dirnamep = xstrdup(""); | |
50 | if(basenamep) | |
51 | *basenamep = xstrdup(""); | |
52 | } | |
53 | } else { | |
54 | /* The path isn't empty and has more than just slashes. e therefore now | |
55 | * points at the end of the basename. */ | |
56 | s = e; | |
57 | while(s > path && s[-1] != '/') | |
58 | --s; | |
59 | /* Now s points at the start of the basename */ | |
60 | if(basenamep) | |
61 | *basenamep = xstrndup(s, e - s); | |
62 | if(s > path) { | |
63 | --s; | |
64 | /* s must now be pointing at a '/' before the basename */ | |
65 | assert(*s == '/'); | |
66 | while(s > path && s[-1] == '/') | |
67 | --s; | |
68 | /* Now s must be pointing at the last '/' after the dirname */ | |
69 | assert(*s == '/'); | |
70 | if(s == path) { | |
71 | /* If we reached the start we must be at the root */ | |
72 | if(dirnamep) | |
73 | *dirnamep = xstrdup("/"); | |
74 | } else { | |
75 | /* There's more than just the root here */ | |
76 | if(dirnamep) | |
77 | *dirnamep = xstrndup(path, s - path); | |
78 | } | |
79 | } else { | |
80 | /* There wasn't a slash */ | |
81 | if(dirnamep) | |
82 | *dirnamep = xstrdup("."); | |
83 | } | |
84 | } | |
85 | } | |
86 | ||
011e0b89 RK |
87 | /** @brief Return the directory part of @p path |
88 | * @param path Path to parse | |
89 | * @return Directory part of @p path | |
90 | * | |
91 | * Extracts the directory part of @p path. This is a simple lexical | |
92 | * transformation and no canonicalization is performed. The result will only | |
2257512d RK |
93 | * ever end "/" if it is the root directory. The result will be "." if there |
94 | * is no directory part. | |
011e0b89 | 95 | */ |
460b9539 | 96 | char *d_dirname(const char *path) { |
2257512d | 97 | char *d = 0; |
460b9539 | 98 | |
2257512d RK |
99 | parse_filename(path, &d, 0); |
100 | assert(d != 0); | |
101 | return d; | |
102 | } | |
103 | ||
104 | /** @brief Return the basename part of @p path | |
59cf25c4 | 105 | * @param path Path to parse |
2257512d RK |
106 | * @return Base part of @p path |
107 | * | |
108 | * Extracts the base part of @p path. This is a simple lexical transformation | |
109 | * and no canonicalization is performed. The result is always newly allocated | |
110 | * even if compares equal to @p path. | |
111 | */ | |
112 | char *d_basename(const char *path) { | |
113 | char *b = 0; | |
114 | ||
115 | parse_filename(path, 0, &b); | |
116 | assert(b != 0); | |
117 | return b; | |
460b9539 | 118 | } |
119 | ||
011e0b89 RK |
120 | /** @brief Find the extension part of @p path |
121 | * @param path Path to parse | |
122 | * @return Start of extension in @p path, or NULL | |
123 | * | |
124 | * The return value points into @p path and points at the "." at the start of | |
125 | * the path. If the basename has no extension the result is NULL. Extensions | |
126 | * are assumed to only contain the ASCII digits and letters. | |
127 | * | |
128 | * See also extension(). | |
129 | */ | |
460b9539 | 130 | static const char *find_extension(const char *path) { |
131 | const char *q = path + strlen(path); | |
132 | ||
133 | while(q > path && strchr("abcdefghijklmnopqrstuvwxyz" | |
134 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
135 | "0123456789", *q)) | |
136 | --q; | |
137 | return *q == '.' ? q : 0; | |
138 | } | |
139 | ||
011e0b89 RK |
140 | /** @brief Strip the extension from @p path |
141 | * @param path Path to parse | |
142 | * @return @p path with extension removed, or @p path | |
143 | * | |
144 | * The extension is defined exactly as for find_extension(). The result might | |
145 | * or might not point into @p path. | |
146 | */ | |
460b9539 | 147 | const char *strip_extension(const char *path) { |
148 | const char *q = find_extension(path); | |
149 | ||
150 | return q ? xstrndup(path, q - path) : path; | |
151 | } | |
152 | ||
011e0b89 RK |
153 | /** @brief Find the extension part of @p path |
154 | * @param path Path to parse | |
155 | * @return Start of extension in @p path, or "" | |
156 | * | |
157 | * The return value may points into @p path and if so points at the "." at the | |
158 | * start of the path. If the basename has no extension the result is "". | |
159 | * Extensions are assumed to only contain the ASCII digits and letters. | |
160 | * | |
161 | * See also find_extension(). | |
162 | */ | |
460b9539 | 163 | const char *extension(const char *path) { |
164 | const char *q = find_extension(path); | |
165 | ||
166 | return q ? q : ""; | |
167 | } | |
168 | ||
169 | /* | |
170 | Local Variables: | |
171 | c-basic-offset:2 | |
172 | comment-column:40 | |
173 | fill-column:79 | |
174 | indent-tabs-mode:nil | |
175 | End: | |
176 | */ |