xalloc: new idx_t-based allocators
This is for code that prefers to use idx_t for sizes.
+ * lib/basename.c (base_name):
+ Prefer idx_t to size_t for indexes, and use idx_t-related allocators.
+ * lib/basename.c: Do not include xstrndup.h.
+ (basename): Simplify by always using memcpy.
* lib/xalloc.h (ximalloc, xizalloc, xicalloc, xirealloc)
(xireallocarray, ximemdup, ximemdup0) [GNULIB_XALLOC]:
New decls.
(ximemdup, ximemdup0): New functions.
(x2nrealloc): Moved here from xalloc.h.
* modules/xalloc (Depends-on): Add ialloc.
+ * modules/dirname (Depends-on): Removbe xstrndup.
ialloc: new module
* lib/ialloc.c, lib/ialloc.h, modules/ialloc: New files.
#include <string.h>
#include "xalloc.h"
-#include "xstrndup.h"
char *
base_name (char const *name)
{
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));
-
- /* 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))
+ idx_t length;
+ int dotslash_len;
+ if (*base)
+ {
+ length = base_len (base);
+
+ /* Collapse a sequence of trailing slashes into one. */
+ length += ISSLASH (base[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. */
+ dotslash_len = FILE_SYSTEM_PREFIX_LEN (base) != 0 ? 2 : 0;
+ }
+ else
+ {
+ /* There is no last component, so NAME is a file system root or
+ the empty string. */
+ base = name;
+ length = base_len (base);
+ dotslash_len = 0;
+ }
+
+ char *p = ximalloc (dotslash_len + length + 1);
+ if (dotslash_len)
{
- char *p = xmalloc (length + 3);
p[0] = '.';
p[1] = '/';
- memcpy (p + 2, base, length);
- p[length + 2] = '\0';
- return p;
}
/* Finally, copy the basename. */
- return xstrndup (base, length);
+ memcpy (p + dotslash_len, base, length);
+ p[dotslash_len + length] = '\0';
+ return p;
}