Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/basename.c @ 6912:314715e0260d
Merge from coreutils.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Mon, 03 Jul 2006 08:32:46 +0000 |
| parents | 96c32553b4c6 |
| children | 8a1a9361108c |
| rev | line source |
|---|---|
| 5907 | 1 /* basename.c -- return the last element in a file name |
| 4633 | 2 |
| 6912 | 3 Copyright (C) 1990, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006 Free |
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4 Software Foundation, Inc. |
| 1250 | 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 2, or (at your option) | |
| 9 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, write to the Free Software Foundation, | |
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18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 9 | 19 |
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20 #ifdef HAVE_CONFIG_H |
| 653 | 21 # include <config.h> |
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22 #endif |
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23 |
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24 #include "dirname.h" |
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25 |
| 6912 | 26 #include <string.h> |
| 27 #include "xalloc.h" | |
| 28 #include "xstrndup.h" | |
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29 |
| 6912 | 30 /* Return the address of the last file name component of NAME. If |
| 31 NAME has no relative file name components because it is a file | |
| 32 system root, return the empty string. */ | |
| 9 | 33 |
| 34 char * | |
| 6912 | 35 last_component (char const *name) |
| 9 | 36 { |
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37 char const *base = name + FILE_SYSTEM_PREFIX_LEN (name); |
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38 char const *p; |
| 6912 | 39 bool saw_slash = false; |
| 40 | |
| 41 while (ISSLASH (*base)) | |
| 42 base++; | |
| 9 | 43 |
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44 for (p = base; *p; p++) |
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45 { |
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46 if (ISSLASH (*p)) |
| 6912 | 47 saw_slash = true; |
| 48 else if (saw_slash) | |
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49 { |
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50 base = p; |
| 6912 | 51 saw_slash = false; |
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52 } |
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53 } |
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54 |
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55 return (char *) base; |
| 9 | 56 } |
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57 |
| 6912 | 58 |
| 59 /* In general, we can't use the builtin `basename' function if available, | |
| 60 since it has different meanings in different environments. | |
| 61 In some environments the builtin `basename' modifies its argument. | |
| 62 | |
| 63 Return the last file name component of NAME, allocated with | |
| 64 xmalloc. On systems with drive letters, a leading "./" | |
| 65 distinguishes relative names that would otherwise look like a drive | |
| 66 letter. Unlike POSIX basename(), NAME cannot be NULL, | |
| 67 base_name("") returns "", and the first trailing slash is not | |
| 68 stripped. | |
| 69 | |
| 70 If lstat (NAME) would succeed, then { chdir (dir_name (NAME)); | |
| 71 lstat (base_name (NAME)); } will access the same file. Likewise, | |
| 72 if the sequence { chdir (dir_name (NAME)); | |
| 73 rename (base_name (NAME), "foo"); } succeeds, you have renamed NAME | |
| 74 to "foo" in the same directory NAME was in. */ | |
| 75 | |
| 76 char * | |
| 77 base_name (char const *name) | |
| 78 { | |
| 79 char const *base = last_component (name); | |
| 80 size_t length; | |
| 81 | |
| 82 /* If there is no last component, then name is a file system root or the | |
| 83 empty string. */ | |
| 84 if (! *base) | |
| 85 return xstrndup (name, base_len (name)); | |
| 86 | |
| 87 /* Collapse a sequence of trailing slashes into one. */ | |
| 88 length = base_len (base); | |
| 89 if (ISSLASH (base[length])) | |
| 90 length++; | |
| 91 | |
| 92 /* On systems with drive letters, `a/b:c' must return `./b:c' rather | |
| 93 than `b:c' to avoid confusion with a drive letter. On systems | |
| 94 with pure POSIX semantics, this is not an issue. */ | |
| 95 if (FILE_SYSTEM_PREFIX_LEN (base)) | |
| 96 { | |
| 97 char *p = xmalloc (length + 3); | |
| 98 p[0] = '.'; | |
| 99 p[1] = '/'; | |
| 100 memcpy (p + 2, base, length); | |
| 101 p[length + 2] = '\0'; | |
| 102 return p; | |
| 103 } | |
| 104 | |
| 105 /* Finally, copy the basename. */ | |
| 106 return xstrndup (base, length); | |
| 107 } | |
| 108 | |
| 109 /* Return the length of the basename NAME. Typically NAME is the | |
| 110 value returned by base_name or last_component. Act like strlen | |
| 111 (NAME), except omit all trailing slashes. */ | |
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112 |
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113 size_t |
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114 base_len (char const *name) |
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115 { |
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116 size_t len; |
| 6912 | 117 size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name); |
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118 |
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119 for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--) |
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120 continue; |
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121 |
| 6912 | 122 if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1 |
| 123 && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2]) | |
| 124 return 2; | |
| 125 | |
| 126 if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len | |
| 127 && len == prefix_len && ISSLASH (name[prefix_len])) | |
| 128 return prefix_len + 1; | |
| 129 | |
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130 return len; |
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131 } |