mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-27 03:41:23 +08:00
52e9a9d118
* string/strnlen.c: New file. * string/Makefile (routines): Add strnlen. * string/string.h [__USE_GNU] (strnlen): Declare new function. [__OPTIMIZE__]: Define extern inline implementation of it. * stdlib/erand48_r.c: Use __mpn_construct_double instead of ldexp and addition, to avoid using anything from -lm. Mon Mar 4 21:57:14 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/unix/sysv/linux/m68k/Makefile: New file. * sysdeps/unix/sysv/linux/m68k/sysdep.h (SYS_ify): Redefine. (CALL_MCOUNT): New macro, empty unless [PROF]. (ENTRY): Do CALL_MCOUNT just after the label. (JUMPTARGET): New macro. (SYSCALL_ERROR_HANDLER): Fix syntax. Thu Mar 14 04:20:48 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu> * sysdeps/unix/sysv/linux/init-first.c (init): Call `__personality' function instead of using inline asm i386 syscall. * sysdeps/unix/sysv/linux/syscalls.list: Add personality syscall. * posix/unistd.h [__USE_BSD]: Declare usleep. * misc/efgcvt.c (MAXDIG): New macro computed from <floats.h> constants. (fcvt, ecvt): Use it for buffer size. * stdlib/drand48-iter.c (__drand48_iterate): Use u_int64_t instead of conditionalizing long vs long long. * stdlib/drand48-iter.c (__drand48_iterate): Don't check for null pointers; never return EFAULT. * stdlib/drand48_r.c (drand48_r): Likewise. * stdlib/erand48_r.c (erand48_r): Likewise.
63 lines
2.1 KiB
C
63 lines
2.1 KiB
C
/* 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 <stdlib.h>
|
|
#include "gmp.h"
|
|
#include "gmp-mparam.h"
|
|
#include <float.h>
|
|
|
|
|
|
/* Function to construct a floating point number from an MP integer
|
|
containing the fraction bits, a base 2 exponent, and a sign flag. */
|
|
extern double __mpn_construct_double (mp_srcptr mpn, int exponent, int neg);
|
|
|
|
int
|
|
erand48_r (xsubi, buffer, result)
|
|
unsigned short int xsubi[3];
|
|
struct drand48_data *buffer;
|
|
double *result;
|
|
{
|
|
mp_limb mpn[(3 * sizeof (unsigned short int) + sizeof (mp_limb) - 1)
|
|
/ sizeof (mp_limb)];
|
|
|
|
/* Compute next state. */
|
|
if (__drand48_iterate (xsubi, buffer) < 0)
|
|
return -1;
|
|
|
|
/* Build a 48-bit mpn containing the 48 random bits. */
|
|
|
|
#if BITS_PER_MP_LIMB == 64
|
|
mpn[0] = (xsubi[0] << 32) | (xsubi[1] << 16) | xsubi[2];
|
|
#elif BITS_PER_MP_LIMB == 32
|
|
mpn[0] = (xsubi[1] << 16) | xsubi[2];
|
|
mpn[1] = xsubi[0];
|
|
#else
|
|
#error "BITS_PER_MP_LIMB value not handled"
|
|
#endif
|
|
|
|
/* Shift them up so they are most significant bits of the fraction. */
|
|
__mpn_lshift (mpn, mpn, sizeof mpn / sizeof mpn[0], DBL_MANT_DIG - 48);
|
|
|
|
/* Construct a positive double using those bits for the fractional part,
|
|
and a zero exponent so the resulting FP number is [0.0,1.0). */
|
|
*result = __mpn_construct_double (mpn, 0, 0);
|
|
|
|
return 0;
|
|
}
|