0,0 → 1,67 |
/* dirname - return directory part of PATH. |
Copyright (C) 1996-2019 Free Software Foundation, Inc. |
This file is part of the GNU C Library. |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
The GNU C Library is free software; you can redistribute it and/or |
modify it under the terms of the GNU Lesser General Public |
License as published by the Free Software Foundation; either |
version 2.1 of the License, or (at your option) any later version. |
The GNU C Library is distributed in the hope that it will be useful, |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
Lesser General Public License for more details. |
You should have received a copy of the GNU Lesser General Public |
License along with the GNU C Library; if not, see |
<http://www.gnu.org/licenses/>. */ |
|
#include <libgen.h> |
#include <string.h> |
|
char * |
dirname (char *path) |
{ |
static const char dot[] = "."; |
char *last_slash; |
/* Find last '/'. */ |
last_slash = path != NULL ? strrchr (path, '/') : NULL; |
if (last_slash != NULL && last_slash != path && last_slash[1] == '\0') |
{ |
/* Determine whether all remaining characters are slashes. */ |
char *runp; |
for (runp = last_slash; runp != path; --runp) |
if (runp[-1] != '/') |
break; |
/* The '/' is the last character, we have to look further. */ |
if (runp != path) |
last_slash = memrchr (path, '/', runp - path); |
} |
if (last_slash != NULL) |
{ |
/* Determine whether all remaining characters are slashes. */ |
char *runp; |
for (runp = last_slash; runp != path; --runp) |
if (runp[-1] != '/') |
break; |
/* Terminate the path. */ |
if (runp == path) |
{ |
/* The last slash is the first character in the string. We have to |
return "/". As a special case we have to return "//" if there |
are exactly two slashes at the beginning of the string. See |
XBD 4.10 Path Name Resolution for more information. */ |
if (last_slash == path + 1) |
++last_slash; |
else |
last_slash = path + 1; |
} |
else |
last_slash = runp; |
last_slash[0] = '\0'; |
} |
else |
/* This assignment is ill-designed but the XPG specs require to |
return a string containing "." in any case no directory part is |
found and so a static and constant string is required. */ |
path = (char *) dot; |
return path; |
} |