| 1 | /* basename.c -- return the last element in a file name |
| 2 | |
| 3 | Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2020 Free Software |
| 4 | Foundation, Inc. |
| 5 | |
| 6 | This program is free software: you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #include <config.h> |
| 20 | |
| 21 | #include "dirname.h" |
| 22 | |
| 23 | #include <string.h> |
| 24 | |
| 25 | /* Return the address of the last file name component of NAME. If |
| 26 | NAME has no relative file name components because it is a file |
| 27 | system root, return the empty string. */ |
| 28 | |
| 29 | char * |
| 30 | last_component (char const *name) |
| 31 | { |
| 32 | char const *base = name + FILE_SYSTEM_PREFIX_LEN (name); |
| 33 | char const *p; |
| 34 | bool saw_slash = false; |
| 35 | |
| 36 | while (ISSLASH (*base)) |
| 37 | base++; |
| 38 | |
| 39 | for (p = base; *p; p++) |
| 40 | { |
| 41 | if (ISSLASH (*p)) |
| 42 | saw_slash = true; |
| 43 | else if (saw_slash) |
| 44 | { |
| 45 | base = p; |
| 46 | saw_slash = false; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | return (char *) base; |
| 51 | } |
| 52 | |
| 53 | /* Return the length of the basename NAME. Typically NAME is the |
| 54 | value returned by base_name or last_component. Act like strlen |
| 55 | (NAME), except omit all trailing slashes. */ |
| 56 | |
| 57 | size_t |
| 58 | base_len (char const *name) |
| 59 | { |
| 60 | size_t len; |
| 61 | size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name); |
| 62 | |
| 63 | for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--) |
| 64 | continue; |
| 65 | |
| 66 | if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1 |
| 67 | && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2]) |
| 68 | return 2; |
| 69 | |
| 70 | if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len |
| 71 | && len == prefix_len && ISSLASH (name[prefix_len])) |
| 72 | return prefix_len + 1; |
| 73 | |
| 74 | return len; |
| 75 | } |