diff options
author | Ulrich Drepper <drepper@redhat.com> | 1996-12-07 03:30:25 +0000 |
---|---|---|
committer | Ulrich Drepper <drepper@redhat.com> | 1996-12-07 03:30:25 +0000 |
commit | a18f587da5a0a91bcd1307ed0f122ca2ce994c15 (patch) | |
tree | 174cca5dd1f842dff255d6491ff6677ac7772eab /stdlib/rand_r.c | |
parent | Remove a.out.h. (diff) | |
download | glibc-a18f587da5a0a91bcd1307ed0f122ca2ce994c15.tar.gz glibc-a18f587da5a0a91bcd1307ed0f122ca2ce994c15.tar.bz2 glibc-a18f587da5a0a91bcd1307ed0f122ca2ce994c15.zip |
update from main archive 961206
Sat Dec 7 03:24:36 1996 Ulrich Drepper <drepper@cygnus.com>
* configure.in: Discard error message from test in test for
bash-2.0.
* io/getpw.c: Don't apply getcwd on user supplied buffer.
Instead always use temporary buffer and only copy the result.
Patch by HJ Lu.
* stdlib/canonicalize.c: Likewise.
* libio/fileops.c: Change comments according to libg++2.8b5.
* libio/iosetvbuf.c: Follow change in libg++-2.8b5 to clear
unbuffered flag.
Reported by HJ Lu.
* manual/nss.texi: Correct prototypes.
* misc/syslog.c: Make reentrant. Catch SIGPIPE signal to prevent
crash if syslog daemon is restarted.
* stdlib/rand_r.c: New file. Implementation of POSIX.2 function
rand_r.
* stdlib/Makefile (routines): Add rand_r.
* sysdeps/stub/libc-lock.h: Define __libc_lock_trylock and
__libc_mutex_lock.
* configure.in: Add --disable-sanity-check option.
* sysdeps/unix/sysv/linux/configure.in: If linuxthreads or
des-crypt are not available and --disbale-sanity-check is not
given abort with a message.
Thu Dec 5 19:19:53 1996 Richard Henderson <rth@tamu.edu>
* posix/glob.c: Tests against STDC_HEADERS should also test
__GNU_LIBRARY__.
Thu Dec 5 16:20:55 1996 Ulrich Drepper <drepper@cygnus.com>
* misc/err.c (vwarn): Set errno again before using %m format.
Thu Dec 5 10:14:05 1996 Andreas Jaeger <aj@arthur.pfalz.de>
* grp/grp.h: Add declaration of __getgrent_r.
* io/fts.c (fts_build): Remove "register" from variables dirbuf
and dp since their address is needed.
* sysdeps/posix/getcwd.c (__getcwd): Remove "register" from
variable d since d's address is needed.
* misc/tst-dirname.c (main): Provide prototype.
* misc/ioctltst.c (main): Dito.
* Makefile: Add gnu/lib-names.h to install-others before including
Makerules.
Wed Dec 4 16:00:09 1996 Ulrich Drepper <drepper@cygnus.com>
* sysdeps/unix/sysv/linux/sys/socketvar.h: New file. Simply use
<sys/socket.h>.
* sysdeps/unix/sysv/linux/Dist: Add sys/socketvar.h.
* sysdeps/unix/sysv/linux/Makefile [$(subdir)=inet)]: Add
sys/socketvar.h to sysdep_headers.
since the value might be outside the range of the `long int'.
Diffstat (limited to 'stdlib/rand_r.c')
-rw-r--r-- | stdlib/rand_r.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/stdlib/rand_r.c b/stdlib/rand_r.c new file mode 100644 index 0000000000..3e0b8b2bc0 --- /dev/null +++ b/stdlib/rand_r.c @@ -0,0 +1,49 @@ +/* Reentrant random function frm POSIX.1c. + Copyright (C) 1996 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. + + 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 <stdlib.h> + + +/* This algorithm is mentioned in the ISO C standard, here extended + for 32 bits. */ +int +rand_r (unsigned int *seed) +{ + unsigned int next = *seed; + int result; + + next *= 1103515245; + next += 12345; + result = (unsigned int) (next / 65536) % 2048; + + next *= 1103515245; + next += 12345; + result <<= 11; + result ^= (unsigned int) (next / 65536) % 1024; + + next *= 1103515245; + next += 12345; + result <<= 10; + result ^= (unsigned int) (next / 65536) % 1024; + + *seed = next; + + return result; +} |