aboutsummaryrefslogtreecommitdiff
path: root/intl/hash-string.c
diff options
context:
space:
mode:
authorUlrich Drepper <drepper@redhat.com>2003-06-11 21:57:23 +0000
committerUlrich Drepper <drepper@redhat.com>2003-06-11 21:57:23 +0000
commitdd9423a67a7650a9b0f50d8151e4f3797c5a14f8 (patch)
tree2b796d5a03925d5782c12a7844c54f631f7d789c /intl/hash-string.c
parentc98d505c4dd96f7a58a3434fadbe4f6c30c29b08 (diff)
downloadglibc-dd9423a67a7650a9b0f50d8151e4f3797c5a14f8.tar
glibc-dd9423a67a7650a9b0f50d8151e4f3797c5a14f8.tar.gz
glibc-dd9423a67a7650a9b0f50d8151e4f3797c5a14f8.tar.bz2
glibc-dd9423a67a7650a9b0f50d8151e4f3797c5a14f8.zip
Update.
2003-06-11 Ulrich Drepper <drepper@redhat.com> * allocatestack.c (queue_stack): Always inline. * ptreadhP.h (__do_cancel): Likewise.
Diffstat (limited to 'intl/hash-string.c')
-rw-r--r--intl/hash-string.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/intl/hash-string.c b/intl/hash-string.c
new file mode 100644
index 0000000000..e4b0f8fe57
--- /dev/null
+++ b/intl/hash-string.c
@@ -0,0 +1,47 @@
+/* Implements a string hashing function.
+ Copyright (C) 1995, 1997, 1998, 2000, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include "hash-string.h"
+
+
+/* Defines the so called `hashpjw' function by P.J. Weinberger
+ [see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
+ 1986, 1987 Bell Telephone Laboratories, Inc.] */
+unsigned long int
+__hash_string (str_param)
+ const char *str_param;
+{
+ unsigned long int hval, g;
+ const char *str = str_param;
+
+ /* Compute the hash value for the given string. */
+ hval = 0;
+ while (*str != '\0')
+ {
+ hval <<= 4;
+ hval += (unsigned long int) *str++;
+ g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
+ if (g != 0)
+ {
+ hval ^= g >> (HASHWORDBITS - 8);
+ hval ^= g;
+ }
+ }
+ return hval;
+}