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glibc/stdlib/xpg_basename.c
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/* Return basename of given pathname according to the weird XPG specification. | |
Copyright (C) 1997-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
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 <string.h> | |
#include <libgen.h> | |
char * | |
__xpg_basename (char *filename) | |
{ | |
char *p; | |
if (filename == NULL || filename[0] == '\0') | |
/* We return a pointer to a static string containing ".". */ | |
p = (char *) "."; | |
else | |
{ | |
p = strrchr (filename, '/'); | |
if (p == NULL) | |
/* There is no slash in the filename. Return the whole string. */ | |
p = filename; | |
else | |
{ | |
if (p[1] == '\0') | |
{ | |
/* We must remove trailing '/'. */ | |
while (p > filename && p[-1] == '/') | |
--p; | |
/* Now we can be in two situations: | |
a) the string only contains '/' characters, so we return | |
'/' | |
b) p points past the last component, but we have to remove | |
the trailing slash. */ | |
if (p > filename) | |
{ | |
*p-- = '\0'; | |
while (p > filename && p[-1] != '/') | |
--p; | |
} | |
else | |
/* The last slash we already found is the right position | |
to return. */ | |
while (p[1] != '\0') | |
++p; | |
} | |
else | |
/* Go to the first character of the name. */ | |
++p; | |
} | |
} | |
return p; | |
} |