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glibc/misc/dirname.c
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/* dirname - return directory part of PATH. | |
Copyright (C) 1996-2016 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; | |
} |