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authorRoland McGrath <roland@gnu.org>1995-09-17 20:23:15 +0000
committerRoland McGrath <roland@gnu.org>1995-09-17 20:23:15 +0000
commit60478656fad8d8a487e9bc52d025f69767c3262b (patch)
tree0ae0836023f1c2f80064e7611f91d19c482208d9 /stdlib/drand48-iter.c
parent9fd18b6c1b397e1af82a0b544f10f946c73864b6 (diff)
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Sat Sep 16 17:47:19 1995 Ulrich Drepper <drepper@ipd.info.uni-karlsruhe.de>
* elf/elf.h (AT_GID): Fix typo: Read -> Real. * misc/efgvt_r.c: New file. Reentrant version of [efg]cvt functions. * misc/efgcvt.c: Rewrite to use reentrant functions. * misc/hsearch_r.c: New file. Reentrant version of functions from hsearch family. * misc/hsearch.c, misc/tsearch.c: New files. * misc/Makefile (routines): Add efgcvt_r, hsearch_r, hsearch, tsearch. * posix/unistd.h (ttyname_r): Add prototype for new function. * stdlib/drand48_r.c, stdlib/erand48_r.c, stdlib/jrand48_r.c, stdlib/lrand48_r.c, stdlib/mrand48_r.c, stdlib/nrand48_r.c, stdlib/seed48_r.c, stdlib/srand48_r.c, stdlib/lcong48_r.c, stdlib/drand48-iter.c: New files implementing reentrant versions of functions from drand48 family. * stdlib/seed48.c, stdlib/drand48.c, stdlib/erand48.c, stdlib/jrand48.c, stdlib/lrand48.c, stdlib/mrand48.c, stdlib/nrand48.c, stdlib/srand48.c, stdlib/lcong48.c: Rewrite to use reentrant versions. * stdlib/a64l.c, stdlib/l64a.c: New files. Implement a64l() and l64a() functions from SysV library. * stdlib/Makefile (routines): Add drand48_r, erand48_r, lrand48_r, nrand48_r, mrand48_r, jrand48_r, srand48_r, seed48_r, lcong48_r, drand48-iter, a64l, l64a. * stdlib/stdlib.h: Declare them. * stdlib/random_r.c: New file. Reentrant version of functions from random family. * stdlib/stdlib.h: Declare them. * stdlib/random.c: Rewrite to use reentrant functions. * string/strerror_r.c: New file. Reentrant version. * string/strerror.c: Change for new _strerror_internal form. * string/Makefile (routines): Add strerror_r. * sysdeps/generic/dl-sysdep.c (_dl_sysdep_start): Set default value of user_entry to `_start'. Close AT_ENTRY case with `break'. * sysdeps/generic/strstr.c: New and much faster implementation by Stephen R. van den Berg. * sysdeps/generic/_strerror.c: _strerror_internal now takes three argument and has and explicit buffer length. * sysdeps/mach/_strerror.c: Change for new interface with three arguments. * stdio/perror.c, stdio/vfprintf.c: Callers changed. * sysdeps/mach/hurd/ttyname_r.c: New file. Reentrant version. * sysdeps/posix/ttyname_r.c: New file. Reentrant version. * sysdeps/stub/ttyname_r: New file. Define as dummy function. * sysdeps/posix/utimes.c: Include <utime.h> for prototype. (utimes): First parameter to utime must be file, not path. * sysdeps/posix/sysconf.c (__sysconf): Test for CLK_TCK in case _SC_CLK_TCK and return it when available. Test for STREAM_MAX in case _SC_STREAM_MAX and return it when available. Add case for _SC_2_LOCALEDEF which is now available. * posix/sys/types.h [__USE_SVID] (key_t): New type. * sysvipc/Makefile, sysvipc/ftok.c, sysvipc/sys/ipc.h, sysvipc/sys/msg.h, sysvipc/sys/sem.h, sysvipc/sys/shm.h, sysdeps/stub/sys/msq_buf.h, sysdeps/stub/sys/sem_buf.h, sysdeps/stub/sys/shm_buf.h, sysdeps/stub/sys/ipc_buf.h, sysdeps/stub/semctl.c, sysdeps/stub/semget.c, sysdeps/stub/semop.c, sysdeps/stub/shmat.c, sysdeps/stub/shmctl.c, sysdeps/stub/shmdt.c, sysdeps/stub/shmget.c, sysdeps/stub/msgctl.c, sysdeps/stub/msgget.c, sysdeps/stub/msgrcv.c, sysdeps/stub/msgsnd.c: New files. Add implementation of System V IPC.
Diffstat (limited to 'stdlib/drand48-iter.c')
-rw-r--r--stdlib/drand48-iter.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/stdlib/drand48-iter.c b/stdlib/drand48-iter.c
new file mode 100644
index 0000000..013dbe7
--- /dev/null
+++ b/stdlib/drand48-iter.c
@@ -0,0 +1,102 @@
+/* Copyright (C) 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include <errno.h>
+#include <stdlib.h>
+
+
+/* Global state for non-reentrent functions. */
+struct drand48_data __libc_drand48_data;
+
+
+int
+__drand48_iterate (xsubi, buffer)
+ unsigned short int xsubi[3];
+ struct drand48_data *buffer;
+{
+ /* Be generous for the arguments, detect some errors. */
+ if (xsubi == NULL || buffer == NULL)
+ {
+ errno = EFAULT;
+ return -1;
+ }
+
+ /* Initialize buffer, if not yet done. */
+ if (!buffer->init)
+ {
+ if (sizeof (unsigned short int) == 2)
+ {
+ buffer->a[2] = 0x5;
+ buffer->a[1] = 0xdeec;
+ buffer->a[0] = 0xe66d;
+ }
+ else
+ {
+ buffer->a[2] = 0x5deec;
+ buffer->a[1] = 0xe66d0000;
+ buffer->a[0] = 0;
+ }
+ buffer->c = 0xb;
+ buffer->init = 1;
+ }
+
+ /* Do the real work. We choose a data type which contains at least
+ 48 bits. Because we compute the modulus it does not care how
+ many bits really are computed. */
+
+ if (sizeof (long int) >= 6)
+ {
+ /* The `long' data type is sufficent. */
+ unsigned long int X, a, result;
+
+#define ONE_STEP \
+ if (sizeof (unsigned short int) == 2) \
+ { \
+ X = (xsubi[2] << 16 | xsubi[1]) << 16 | xsubi[0]; \
+ a = (buffer->a[2] << 16 | buffer->a[1]) << 16 | buffer->a[0]; \
+ \
+ result = X * a + buffer->c; \
+ \
+ xsubi[0] = result & 0xffff; \
+ result >>= 16; \
+ xsubi[1] = result & 0xffff; \
+ result >>= 16; \
+ xsubi[2] = result & 0xffff; \
+ } \
+ else \
+ { \
+ X = xsubi[2] << 16 | xsubi[1] >> 16; \
+ a = buffer->a[2] << 16 | buffer->a[1] >> 16; \
+ \
+ result = X * a + buffer->c; \
+ \
+ xsubi[0] = result >> 16 & 0xffffffffl; \
+ xsubi[1] = result << 16 & 0xffff0000l; \
+ }
+ ONE_STEP;
+ }
+ else
+ {
+ /* We have to use the `long long' data type. */
+ unsigned long long int X, a, result;
+ ONE_STEP;
+ }
+
+ return 0;
+}