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434
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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, 2009-2010 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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