From 60478656fad8d8a487e9bc52d025f69767c3262b Mon Sep 17 00:00:00 2001 From: Roland McGrath Date: Sun, 17 Sep 1995 20:23:15 +0000 Subject: Sat Sep 16 17:47:19 1995 Ulrich Drepper * 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 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. --- stdlib/drand48-iter.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 stdlib/drand48-iter.c (limited to 'stdlib/drand48-iter.c') 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 , 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 +#include + + +/* 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; +} -- cgit v1.1