2011-10-23 Ulrich Drepper <drepper@gmail.com>
+ * string/strnlen.c: Don't define STRNLEN, reverse logic.
+ Remove unused variable magic_bits.
+ * sysdeps/i386/i686/multiarch/rtld-strnlen.c: New file.
+
* string/strnlen.c: Define and use STRNLEN macro.
* sysdeps/i386/i686/multiarch/Makefile [string] (sysdep_routines):
Add strnlen-sse2, strnlen-c, wcslen-sse2, and wcslen-c.
/* Find the length of S, but scan at most MAXLEN characters. If no
'\0' terminator is found in that many characters, return MAXLEN. */
-#ifndef STRNLEN
-# define STRNLEN __strnlen
+#ifdef STRNLEN
+# define __strnlen STRNLEN
#endif
size_t
-STRNLEN (const char *str, size_t maxlen)
+__strnlen (const char *str, size_t maxlen)
{
const char *char_ptr, *end_ptr = str + maxlen;
const unsigned long int *longword_ptr;
- unsigned long int longword, magic_bits, himagic, lomagic;
+ unsigned long int longword, himagic, lomagic;
if (maxlen == 0)
return 0;
The 1-bits make sure that carries propagate to the next 0-bit.
The 0-bits provide holes for carries to fall into. */
- magic_bits = 0x7efefeffL;
himagic = 0x80808080L;
lomagic = 0x01010101L;
if (sizeof (longword) > 4)
{
/* 64-bit version of the magic. */
/* Do the shift in two steps to avoid a warning if long has 32 bits. */
- magic_bits = ((0x7efefefeL << 16) << 16) | 0xfefefeffL;
himagic = ((himagic << 16) << 16) | himagic;
lomagic = ((lomagic << 16) << 16) | lomagic;
}