Mercurial > gnulib
annotate lib/dirname-lgpl.c @ 40203:30d91797009f
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| author | Karl Berry <karl@freefriends.org> |
|---|---|
| date | Fri, 01 Mar 2019 08:42:42 -0800 |
| parents | b06060465f09 |
| children |
| rev | line source |
|---|---|
| 12212 | 1 /* dirname.c -- return all but the last element in a file name |
| 2 | |
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Paul Eggert <eggert@cs.ucla.edu>
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3 Copyright (C) 1990, 1998, 2000-2001, 2003-2006, 2009-2019 Free Software |
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Jim Meyering <meyering@redhat.com>
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4 Foundation, Inc. |
| 12212 | 5 |
| 6 This program is free software: you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 3 of the License, or | |
| 9 (at your option) any later version. | |
| 10 | |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 19190 | 17 along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 12212 | 18 |
| 19 #include <config.h> | |
| 20 | |
| 21 #include "dirname.h" | |
| 22 | |
| 23 #include <stdlib.h> | |
| 24 #include <string.h> | |
| 25 | |
| 26 /* Return the length of the prefix of FILE that will be used by | |
| 27 dir_name. If FILE is in the working directory, this returns zero | |
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28 even though 'dir_name (FILE)' will return ".". Works properly even |
| 12212 | 29 if there are trailing slashes (by effectively ignoring them). */ |
| 30 | |
| 31 size_t | |
| 32 dir_len (char const *file) | |
| 33 { | |
| 34 size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file); | |
| 35 size_t length; | |
| 36 | |
| 37 /* Advance prefix_length beyond important leading slashes. */ | |
| 38 prefix_length += (prefix_length != 0 | |
| 39 ? (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE | |
| 40 && ISSLASH (file[prefix_length])) | |
| 41 : (ISSLASH (file[0]) | |
| 42 ? ((DOUBLE_SLASH_IS_DISTINCT_ROOT | |
| 43 && ISSLASH (file[1]) && ! ISSLASH (file[2]) | |
| 44 ? 2 : 1)) | |
| 45 : 0)); | |
| 46 | |
| 47 /* Strip the basename and any redundant slashes before it. */ | |
| 48 for (length = last_component (file) - file; | |
| 49 prefix_length < length; length--) | |
| 50 if (! ISSLASH (file[length - 1])) | |
| 51 break; | |
| 52 return length; | |
| 53 } | |
| 54 | |
| 55 | |
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56 /* In general, we can't use the builtin 'dirname' function if available, |
| 12212 | 57 since it has different meanings in different environments. |
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58 In some environments the builtin 'dirname' modifies its argument. |
| 12212 | 59 |
| 60 Return the leading directories part of FILE, allocated with malloc. | |
| 61 Works properly even if there are trailing slashes (by effectively | |
| 62 ignoring them). Return NULL on failure. | |
| 63 | |
| 64 If lstat (FILE) would succeed, then { chdir (dir_name (FILE)); | |
| 65 lstat (base_name (FILE)); } will access the same file. Likewise, | |
| 66 if the sequence { chdir (dir_name (FILE)); | |
| 67 rename (base_name (FILE), "foo"); } succeeds, you have renamed FILE | |
| 68 to "foo" in the same directory FILE was in. */ | |
| 69 | |
| 70 char * | |
| 71 mdir_name (char const *file) | |
| 72 { | |
| 73 size_t length = dir_len (file); | |
| 74 bool append_dot = (length == 0 | |
| 75 || (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE | |
| 76 && length == FILE_SYSTEM_PREFIX_LEN (file) | |
| 77 && file[2] != '\0' && ! ISSLASH (file[2]))); | |
| 78 char *dir = malloc (length + append_dot + 1); | |
| 79 if (!dir) | |
| 80 return NULL; | |
| 81 memcpy (dir, file, length); | |
| 82 if (append_dot) | |
| 83 dir[length++] = '.'; | |
| 84 dir[length] = '\0'; | |
| 85 return dir; | |
| 86 } |