-/* basename.c -- return the last element in a path
- Copyright (C) 1990, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+/* basename.c -- return the last element in a file name
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1990, 1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006 Free
+ Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
-#include <stdio.h>
-#include <assert.h>
+#include "dirname.h"
-#ifndef FILESYSTEM_PREFIX_LEN
-# define FILESYSTEM_PREFIX_LEN(Filename) 0
-#endif
+#include <string.h>
+#include "xalloc.h"
+#include "xstrndup.h"
-#ifndef PARAMS
-# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
-# define PARAMS(Args) Args
-# else
-# define PARAMS(Args) ()
-# endif
-#endif
+/* Return the address of the last file name component of NAME. If
+ NAME has no relative file name components because it is a file
+ system root, return the empty string. */
-#ifndef ISSLASH
-# define ISSLASH(C) ((C) == '/')
-#endif
+char *
+last_component (char const *name)
+{
+ char const *base = name + FILE_SYSTEM_PREFIX_LEN (name);
+ char const *p;
+ bool saw_slash = false;
+
+ while (ISSLASH (*base))
+ base++;
+
+ for (p = base; *p; p++)
+ {
+ if (ISSLASH (*p))
+ saw_slash = true;
+ else if (saw_slash)
+ {
+ base = p;
+ saw_slash = false;
+ }
+ }
+
+ return (char *) base;
+}
-char *base_name PARAMS ((char const *name));
/* In general, we can't use the builtin `basename' function if available,
since it has different meanings in different environments.
In some environments the builtin `basename' modifies its argument.
- If NAME is all slashes, be sure to return `/'. */
+
+ Return the last file name component of NAME, allocated with
+ xmalloc. On systems with drive letters, a leading "./"
+ distinguishes relative names that would otherwise look like a drive
+ letter. Unlike POSIX basename(), NAME cannot be NULL,
+ base_name("") returns "", and the first trailing slash is not
+ stripped.
+
+ If lstat (NAME) would succeed, then { chdir (dir_name (NAME));
+ lstat (base_name (NAME)); } will access the same file. Likewise,
+ if the sequence { chdir (dir_name (NAME));
+ rename (base_name (NAME), "foo"); } succeeds, you have renamed NAME
+ to "foo" in the same directory NAME was in. */
char *
base_name (char const *name)
{
- char const *base = name += FILESYSTEM_PREFIX_LEN (name);
- int all_slashes = 1;
- char const *p;
+ char const *base = last_component (name);
+ size_t length;
+
+ /* If there is no last component, then name is a file system root or the
+ empty string. */
+ if (! *base)
+ return xstrndup (name, base_len (name));
- for (p = name; *p; p++)
+ /* Collapse a sequence of trailing slashes into one. */
+ length = base_len (base);
+ if (ISSLASH (base[length]))
+ length++;
+
+ /* On systems with drive letters, `a/b:c' must return `./b:c' rather
+ than `b:c' to avoid confusion with a drive letter. On systems
+ with pure POSIX semantics, this is not an issue. */
+ if (FILE_SYSTEM_PREFIX_LEN (base))
{
- if (ISSLASH (*p))
- base = p + 1;
- else
- all_slashes = 0;
+ char *p = xmalloc (length + 3);
+ p[0] = '.';
+ p[1] = '/';
+ memcpy (p + 2, base, length);
+ p[length + 2] = '\0';
+ return p;
}
- /* If NAME is all slashes, arrange to return `/'. */
- if (*base == '\0' && ISSLASH (*name) && all_slashes)
- --base;
+ /* Finally, copy the basename. */
+ return xstrndup (base, length);
+}
+
+/* Return the length of the basename NAME. Typically NAME is the
+ value returned by base_name or last_component. Act like strlen
+ (NAME), except omit all trailing slashes. */
- /* Make sure the last byte is not a slash. */
- assert (all_slashes || !ISSLASH (*(p - 1)));
+size_t
+base_len (char const *name)
+{
+ size_t len;
+ size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name);
- return (char *) base;
+ for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--)
+ continue;
+
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1
+ && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2])
+ return 2;
+
+ if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len
+ && len == prefix_len && ISSLASH (name[prefix_len]))
+ return prefix_len + 1;
+
+ return len;
}
projects / gnulib.git / blobdiff