From a18f587da5a0a91bcd1307ed0f122ca2ce994c15 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Sat, 7 Dec 1996 03:30:25 +0000 Subject: update from main archive 961206 Sat Dec 7 03:24:36 1996 Ulrich Drepper * 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 * posix/glob.c: Tests against STDC_HEADERS should also test __GNU_LIBRARY__. Thu Dec 5 16:20:55 1996 Ulrich Drepper * misc/err.c (vwarn): Set errno again before using %m format. Thu Dec 5 10:14:05 1996 Andreas Jaeger * 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 * sysdeps/unix/sysv/linux/sys/socketvar.h: New file. Simply use . * 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'. --- stdlib/rand_r.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 stdlib/rand_r.c (limited to 'stdlib/rand_r.c') 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 , 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 + + +/* 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; +} -- cgit v1.2.3-65-gdbad