100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
/* dirname - return directory part of PATH.
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Copyright (C) 1996, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file was part of the GNU C Library, version 2.3.2.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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Very slightly modified for use in Fuse by Philip Kendall, 2004.
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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 2 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 along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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Author contact information:
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E-mail: philip-fuse@shadowmagic.org.uk
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*/
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#include <config.h>
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#include <string.h>
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#include "fuse.h"
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static char *
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__memrchr (char *s, int c, size_t n)
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{
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for (s += n - 1; n; n--, s--)
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if (*s == c)
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return s;
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return NULL;
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}
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char *
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dirname (char *path)
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{
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static const char dot[] = ".";
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char *last_slash;
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/* Find last '/'. */
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last_slash = path != NULL ? strrchr (path, FUSE_DIR_SEP_CHR) : NULL;
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if (last_slash != NULL && last_slash != path && last_slash[1] == '\0')
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{
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/* Determine whether all remaining characters are slashes. */
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char *runp;
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for (runp = last_slash; runp != path; --runp)
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if (runp[-1] != FUSE_DIR_SEP_CHR)
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break;
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/* The '/' is the last character, we have to look further. */
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if (runp != path)
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last_slash = __memrchr (path, FUSE_DIR_SEP_CHR, runp - path);
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}
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if (last_slash != NULL)
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{
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/* Determine whether all remaining characters are slashes. */
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char *runp;
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for (runp = last_slash; runp != path; --runp)
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if (runp[-1] != FUSE_DIR_SEP_CHR)
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break;
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/* Terminate the path. */
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if (runp == path)
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{
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/* The last slash is the first character in the string. We have to
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return "/". As a special case we have to return "//" if there
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are exactly two slashes at the beginning of the string. See
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XBD 4.10 Path Name Resolution for more information. */
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if (last_slash == path + 1)
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++last_slash;
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else
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last_slash = path + 1;
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}
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else
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last_slash = runp;
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last_slash[0] = '\0';
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}
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else
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/* This assignment is ill-designed but the XPG specs require to
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return a string containing "." in any case no directory part is
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found and so a static and constant string is required. */
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path = (char *) dot;
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return path;
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}
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