| 1 | /* basename.c -- return the last element in a file name
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| 2 |
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| 3 | Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2012 Free Software
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| 4 | Foundation, Inc.
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| 5 |
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| 6 | This program is free software: you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 18 |
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| 19 | #include <config.h>
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| 20 |
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| 21 | #include "dirname.h"
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| 22 |
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| 23 | #include <string.h>
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| 24 |
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| 25 | /* Return the address of the last file name component of NAME. If
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| 26 | NAME has no relative file name components because it is a file
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| 27 | system root, return the empty string. */
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| 28 |
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| 29 | char *
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| 30 | last_component (char const *name)
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| 31 | {
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| 32 | char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
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| 33 | char const *p;
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| 34 | bool saw_slash = false;
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| 35 |
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| 36 | while (ISSLASH (*base))
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| 37 | base++;
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| 38 |
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| 39 | for (p = base; *p; p++)
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| 40 | {
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| 41 | if (ISSLASH (*p))
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| 42 | saw_slash = true;
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| 43 | else if (saw_slash)
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| 44 | {
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| 45 | base = p;
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| 46 | saw_slash = false;
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| 47 | }
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| 48 | }
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| 49 |
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| 50 | return (char *) base;
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| 51 | }
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| 52 |
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| 53 | /* Return the length of the basename NAME. Typically NAME is the
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| 54 | value returned by base_name or last_component. Act like strlen
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| 55 | (NAME), except omit all trailing slashes. */
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| 56 |
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| 57 | size_t
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| 58 | base_len (char const *name)
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| 59 | {
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| 60 | size_t len;
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| 61 | size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
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| 62 |
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| 63 | for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--)
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| 64 | continue;
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| 65 |
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| 66 | if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
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| 67 | && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
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| 68 | return 2;
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| 69 |
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| 70 | if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
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| 71 | && len == prefix_len && ISSLASH (name[prefix_len]))
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| 72 | return prefix_len + 1;
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| 73 |
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| 74 | return len;
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| 75 | }
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