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/* basename.c -- return the last element in a file name
Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2020 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "dirname.h"
#include <string.h>
/* Return the address of the last file name component of NAME. If
NAME has no relative file name components because it is a file
system root, return the empty string. */
char *
last_component (char const *name)
{
char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
char const *p;
bool saw_slash = false;
while (ISSLASH (*base))
base++;
for (p = base; *p; p++)
{
if (ISSLASH (*p))
saw_slash = true;
else if (saw_slash)
{
base = p;
saw_slash = false;
}
}
return (char *) base;
}
/* Return the length of the basename NAME. Typically NAME is the
value returned by base_name or last_component. Act like strlen
(NAME), except omit all trailing slashes. */
size_t
base_len (char const *name)
{
size_t len;
size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--)
continue;
if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
&& ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
return 2;
if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
&& len == prefix_len && ISSLASH (name[prefix_len]))
return prefix_len + 1;
return len;
}
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