| 1 | /* |
| 2 | * This file is part of DisOrder |
| 3 | * Copyright (C) 2005, 2007 Richard Kettlewell |
| 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 | */ |
| 20 | /** @file lib/filepart.c |
| 21 | * @brief Filename parsing |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | #include "types.h" |
| 26 | |
| 27 | #include <string.h> |
| 28 | |
| 29 | #include "filepart.h" |
| 30 | #include "mem.h" |
| 31 | |
| 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 | */ |
| 40 | char *d_dirname(const char *path) { |
| 41 | const char *s; |
| 42 | |
| 43 | if((s = strrchr(path, '/'))) { |
| 44 | while(s > path && s[-1] == '/') |
| 45 | --s; |
| 46 | if(s == path) |
| 47 | return xstrdup("/"); |
| 48 | else |
| 49 | return xstrndup(path, s - path); |
| 50 | } else |
| 51 | return xstrdup("."); |
| 52 | } |
| 53 | |
| 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 | */ |
| 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 | |
| 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 | */ |
| 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 | |
| 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 | */ |
| 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 | */ |