65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* basename.c -- return the last element in a file name
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Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2022 Free Software
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Foundation, Inc.
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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 3 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
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "dirname.h"
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#include <string.h>
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#include "xalloc.h"
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char *
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base_name (char const *name)
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{
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char const *base = last_component (name);
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idx_t length;
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int dotslash_len;
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if (*base)
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{
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length = base_len (base);
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/* Collapse a sequence of trailing slashes into one. */
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length += ISSLASH (base[length]);
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/* On systems with drive letters, "a/b:c" must return "./b:c" rather
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than "b:c" to avoid confusion with a drive letter. On systems
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with pure POSIX semantics, this is not an issue. */
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dotslash_len = FILE_SYSTEM_PREFIX_LEN (base) != 0 ? 2 : 0;
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}
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else
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{
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/* There is no last component, so NAME is a file system root or
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the empty string. */
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base = name;
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length = base_len (base);
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dotslash_len = 0;
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}
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char *p = ximalloc (dotslash_len + length + 1);
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if (dotslash_len)
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{
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p[0] = '.';
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p[1] = '/';
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}
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/* Finally, copy the basename. */
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memcpy (p + dotslash_len, base, length);
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p[dotslash_len + length] = '\0';
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return p;
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}
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