-/* Copyright (C) 1991, 1993 Free Software Foundation, Inc.
- Based on strlen implemention by Torbjorn Granlund (tege@sics.se),
+/* Copyright (C) 1991,93,96,97,99,2000 Free Software Foundation, Inc.
+ Based on strlen implementation by Torbjorn Granlund (tege@sics.se),
with help from Dan Sahlin (dan@sics.se) and
commentary by Jim Blandy (jimb@ai.mit.edu);
adaptation to memchr suggested by Dick Karpinski (dick@cca.ucsf.edu),
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+USA. */
#ifdef HAVE_CONFIG_H
-#include <config.h>
+# include <config.h>
#endif
#undef __ptr_t
# define __ptr_t char *
#endif /* C++ or ANSI C. */
-#if defined (HAVE_LIMITS_H) || defined (_LIBC)
+#if defined _LIBC
+# include <string.h>
+# include <memcopy.h>
+#else
+# define reg_char char
+#endif
+
+#if HAVE_STDLIB_H || defined _LIBC
+# include <stdlib.h>
+#endif
+
+#if HAVE_LIMITS_H || defined _LIBC
# include <limits.h>
#endif
#define LONG_MAX_32_BITS 2147483647
#ifndef LONG_MAX
-#define LONG_MAX LONG_MAX_32_BITS
+# define LONG_MAX LONG_MAX_32_BITS
#endif
#include <sys/types.h>
+#if HAVE_BP_SYM_H || defined _LIBC
+# include <bp-sym.h>
+#else
+# define BP_SYM(sym) sym
+#endif
+#undef memchr
+#undef __memchr
/* Search no more than N bytes of S for C. */
-
__ptr_t
-memchr (s, c, n)
+__memchr (s, c_in, n)
const __ptr_t s;
- int c;
+ int c_in;
size_t n;
{
const unsigned char *char_ptr;
const unsigned long int *longword_ptr;
unsigned long int longword, magic_bits, charmask;
+ unsigned reg_char c;
- c = (unsigned char) c;
+ c = (unsigned char) c_in;
/* Handle the first few characters by reading one character at a time.
Do this until CHAR_PTR is aligned on a longword boundary. */
- for (char_ptr = s; n > 0 && ((unsigned long int) char_ptr
- & (sizeof (longword) - 1)) != 0;
+ for (char_ptr = (const unsigned char *) s;
+ n > 0 && ((unsigned long int) char_ptr
+ & (sizeof (longword) - 1)) != 0;
--n, ++char_ptr)
if (*char_ptr == c)
return (__ptr_t) char_ptr;
/* Bits 31, 24, 16, and 8 of this number are zero. Call these bits
the "holes." Note that there is a hole just to the left of
each byte, with an extra at the end:
-
+
bits: 01111110 11111110 11111110 11111111
- bytes: AAAAAAAA BBBBBBBB CCCCCCCC DDDDDDDD
+ bytes: AAAAAAAA BBBBBBBB CCCCCCCC DDDDDDDD
The 1-bits make sure that carries propagate to the next 0-bit.
The 0-bits provide holes for carries to fall into. */
/* Add MAGIC_BITS to LONGWORD. */
if ((((longword + magic_bits)
-
+
/* Set those bits that were unchanged by the addition. */
^ ~longword)
-
+
/* Look at only the hole bits. If any of the hole bits
are unchanged, most likely one of the bytes was a
zero. */
return 0;
}
+#ifdef weak_alias
+weak_alias (__memchr, BP_SYM (memchr))
+#endif