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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> | |
2257512d RK |
28 | #include <assert.h> |
29 | #include <stdio.h> | |
460b9539 | 30 | |
31 | #include "filepart.h" | |
32 | #include "mem.h" | |
33 | ||
2257512d RK |
34 | /** @brief Parse a filename |
35 | * @param path Filename to parse | |
36 | * @param Where to put directory name, or NULL | |
37 | * @param Where to put basename, or NULL | |
38 | */ | |
39 | static void parse_filename(const char *path, | |
40 | char **dirnamep, | |
41 | char **basenamep) { | |
42 | const char *s, *e = path + strlen(path); | |
43 | ||
44 | /* Strip trailing slashes. We never take these into account. */ | |
45 | while(e > path && e[-1] == '/') | |
46 | --e; | |
47 | if(e == path) { | |
48 | /* The path is empty or contains only slashes */ | |
49 | if(*path) { | |
50 | if(dirnamep) | |
51 | *dirnamep = xstrdup("/"); | |
52 | if(basenamep) | |
53 | *basenamep = xstrdup("/"); | |
54 | } else { | |
55 | if(dirnamep) | |
56 | *dirnamep = xstrdup(""); | |
57 | if(basenamep) | |
58 | *basenamep = xstrdup(""); | |
59 | } | |
60 | } else { | |
61 | /* The path isn't empty and has more than just slashes. e therefore now | |
62 | * points at the end of the basename. */ | |
63 | s = e; | |
64 | while(s > path && s[-1] != '/') | |
65 | --s; | |
66 | /* Now s points at the start of the basename */ | |
67 | if(basenamep) | |
68 | *basenamep = xstrndup(s, e - s); | |
69 | if(s > path) { | |
70 | --s; | |
71 | /* s must now be pointing at a '/' before the basename */ | |
72 | assert(*s == '/'); | |
73 | while(s > path && s[-1] == '/') | |
74 | --s; | |
75 | /* Now s must be pointing at the last '/' after the dirname */ | |
76 | assert(*s == '/'); | |
77 | if(s == path) { | |
78 | /* If we reached the start we must be at the root */ | |
79 | if(dirnamep) | |
80 | *dirnamep = xstrdup("/"); | |
81 | } else { | |
82 | /* There's more than just the root here */ | |
83 | if(dirnamep) | |
84 | *dirnamep = xstrndup(path, s - path); | |
85 | } | |
86 | } else { | |
87 | /* There wasn't a slash */ | |
88 | if(dirnamep) | |
89 | *dirnamep = xstrdup("."); | |
90 | } | |
91 | } | |
92 | } | |
93 | ||
011e0b89 RK |
94 | /** @brief Return the directory part of @p path |
95 | * @param path Path to parse | |
96 | * @return Directory part of @p path | |
97 | * | |
98 | * Extracts the directory part of @p path. This is a simple lexical | |
99 | * transformation and no canonicalization is performed. The result will only | |
2257512d RK |
100 | * ever end "/" if it is the root directory. The result will be "." if there |
101 | * is no directory part. | |
011e0b89 | 102 | */ |
460b9539 | 103 | char *d_dirname(const char *path) { |
2257512d | 104 | char *d = 0; |
460b9539 | 105 | |
2257512d RK |
106 | parse_filename(path, &d, 0); |
107 | assert(d != 0); | |
108 | return d; | |
109 | } | |
110 | ||
111 | /** @brief Return the basename part of @p path | |
112 | * @param Path to parse | |
113 | * @return Base part of @p path | |
114 | * | |
115 | * Extracts the base part of @p path. This is a simple lexical transformation | |
116 | * and no canonicalization is performed. The result is always newly allocated | |
117 | * even if compares equal to @p path. | |
118 | */ | |
119 | char *d_basename(const char *path) { | |
120 | char *b = 0; | |
121 | ||
122 | parse_filename(path, 0, &b); | |
123 | assert(b != 0); | |
124 | return b; | |
460b9539 | 125 | } |
126 | ||
011e0b89 RK |
127 | /** @brief Find the extension part of @p path |
128 | * @param path Path to parse | |
129 | * @return Start of extension in @p path, or NULL | |
130 | * | |
131 | * The return value points into @p path and points at the "." at the start of | |
132 | * the path. If the basename has no extension the result is NULL. Extensions | |
133 | * are assumed to only contain the ASCII digits and letters. | |
134 | * | |
135 | * See also extension(). | |
136 | */ | |
460b9539 | 137 | static const char *find_extension(const char *path) { |
138 | const char *q = path + strlen(path); | |
139 | ||
140 | while(q > path && strchr("abcdefghijklmnopqrstuvwxyz" | |
141 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
142 | "0123456789", *q)) | |
143 | --q; | |
144 | return *q == '.' ? q : 0; | |
145 | } | |
146 | ||
011e0b89 RK |
147 | /** @brief Strip the extension from @p path |
148 | * @param path Path to parse | |
149 | * @return @p path with extension removed, or @p path | |
150 | * | |
151 | * The extension is defined exactly as for find_extension(). The result might | |
152 | * or might not point into @p path. | |
153 | */ | |
460b9539 | 154 | const char *strip_extension(const char *path) { |
155 | const char *q = find_extension(path); | |
156 | ||
157 | return q ? xstrndup(path, q - path) : path; | |
158 | } | |
159 | ||
011e0b89 RK |
160 | /** @brief Find the extension part of @p path |
161 | * @param path Path to parse | |
162 | * @return Start of extension in @p path, or "" | |
163 | * | |
164 | * The return value may points into @p path and if so points at the "." at the | |
165 | * start of the path. If the basename has no extension the result is "". | |
166 | * Extensions are assumed to only contain the ASCII digits and letters. | |
167 | * | |
168 | * See also find_extension(). | |
169 | */ | |
460b9539 | 170 | const char *extension(const char *path) { |
171 | const char *q = find_extension(path); | |
172 | ||
173 | return q ? q : ""; | |
174 | } | |
175 | ||
176 | /* | |
177 | Local Variables: | |
178 | c-basic-offset:2 | |
179 | comment-column:40 | |
180 | fill-column:79 | |
181 | indent-tabs-mode:nil | |
182 | End: | |
183 | */ |