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86 lines
3.1 KiB
86 lines
3.1 KiB
/* dirname.c -- return all but the last element in a file name |
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Copyright (C) 1990, 1998, 2000-2001, 2003-2006, 2009-2017 Free Software |
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Foundation, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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#include <config.h> |
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#include "dirname.h" |
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#include <stdlib.h> |
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#include <string.h> |
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/* Return the length of the prefix of FILE that will be used by |
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dir_name. If FILE is in the working directory, this returns zero |
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even though 'dir_name (FILE)' will return ".". Works properly even |
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if there are trailing slashes (by effectively ignoring them). */ |
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size_t |
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dir_len (char const *file) |
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{ |
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size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file); |
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size_t length; |
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/* Advance prefix_length beyond important leading slashes. */ |
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prefix_length += (prefix_length != 0 |
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? (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE |
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&& ISSLASH (file[prefix_length])) |
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: (ISSLASH (file[0]) |
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? ((DOUBLE_SLASH_IS_DISTINCT_ROOT |
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&& ISSLASH (file[1]) && ! ISSLASH (file[2]) |
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? 2 : 1)) |
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: 0)); |
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/* Strip the basename and any redundant slashes before it. */ |
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for (length = last_component (file) - file; |
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prefix_length < length; length--) |
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if (! ISSLASH (file[length - 1])) |
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break; |
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return length; |
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} |
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/* In general, we can't use the builtin 'dirname' function if available, |
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since it has different meanings in different environments. |
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In some environments the builtin 'dirname' modifies its argument. |
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Return the leading directories part of FILE, allocated with malloc. |
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Works properly even if there are trailing slashes (by effectively |
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ignoring them). Return NULL on failure. |
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If lstat (FILE) would succeed, then { chdir (dir_name (FILE)); |
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lstat (base_name (FILE)); } will access the same file. Likewise, |
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if the sequence { chdir (dir_name (FILE)); |
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rename (base_name (FILE), "foo"); } succeeds, you have renamed FILE |
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to "foo" in the same directory FILE was in. */ |
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char * |
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mdir_name (char const *file) |
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{ |
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size_t length = dir_len (file); |
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bool append_dot = (length == 0 |
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|| (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE |
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&& length == FILE_SYSTEM_PREFIX_LEN (file) |
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&& file[2] != '\0' && ! ISSLASH (file[2]))); |
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char *dir = malloc (length + append_dot + 1); |
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if (!dir) |
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return NULL; |
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memcpy (dir, file, length); |
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if (append_dot) |
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dir[length++] = '.'; |
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dir[length] = '\0'; |
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return dir; |
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}
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