76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/* basename.c -- return the last element in a file name
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Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2020 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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/* Return the address of the last file name component of NAME. If
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NAME has no relative file name components because it is a file
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system root, return the empty string. */
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char *
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last_component (char const *name)
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{
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char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
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char const *p;
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bool saw_slash = false;
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while (ISSLASH (*base))
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base++;
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for (p = base; *p; p++)
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{
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if (ISSLASH (*p))
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saw_slash = true;
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else if (saw_slash)
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{
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base = p;
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saw_slash = false;
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}
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}
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return (char *) base;
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}
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/* Return the length of the basename NAME. Typically NAME is the
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value returned by base_name or last_component. Act like strlen
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(NAME), except omit all trailing slashes. */
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size_t
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base_len (char const *name)
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{
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size_t len;
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size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
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for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--)
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continue;
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if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
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&& ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
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return 2;
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if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
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&& len == prefix_len && ISSLASH (name[prefix_len]))
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return prefix_len + 1;
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return len;
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}
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