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71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* Return basename of given pathname according to the weird XPG specification.
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Copyright (C) 1997-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include <libgen.h>
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char *
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__xpg_basename (char *filename)
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{
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char *p;
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if (filename == NULL || filename[0] == '\0')
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/* We return a pointer to a static string containing ".". */
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p = (char *) ".";
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else
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{
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p = strrchr (filename, '/');
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if (p == NULL)
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/* There is no slash in the filename. Return the whole string. */
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p = filename;
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else
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{
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if (p[1] == '\0')
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{
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/* We must remove trailing '/'. */
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while (p > filename && p[-1] == '/')
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--p;
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/* Now we can be in two situations:
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a) the string only contains '/' characters, so we return
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'/'
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b) p points past the last component, but we have to remove
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the trailing slash. */
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if (p > filename)
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{
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*p-- = '\0';
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while (p > filename && p[-1] != '/')
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--p;
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}
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else
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/* The last slash we already found is the right position
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to return. */
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while (p[1] != '\0')
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++p;
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}
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else
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/* Go to the first character of the name. */
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++p;
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}
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}
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return p;
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}
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