From 73742c2566e6f8d56b3b132026ad477b9924e774 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Tue, 8 Aug 2006 22:22:47 +0000 Subject: New file, introduced for shuf, sort -R, and/or shred. --- lib/randint.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 lib/randint.h (limited to 'lib/randint.h') diff --git a/lib/randint.h b/lib/randint.h new file mode 100644 index 000000000..4245a6d3f --- /dev/null +++ b/lib/randint.h @@ -0,0 +1,52 @@ +/* Generate random integers. + + Copyright (C) 2006 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* Written by Paul Eggert. */ + +#ifndef RANDINT_H + +# define RANDINT_H 1 + +# include + +# include "randread.h" + +/* An unsigned integer type, used for random integers, and its maximum + value. */ +typedef uintmax_t randint; +# define RANDINT_MAX UINTMAX_MAX + +struct randint_source; + +struct randint_source *randint_new (struct randread_source *); +struct randint_source *randint_all_new (char const *, size_t); +struct randread_source *randint_get_source (struct randint_source const *); +randint randint_genmax (struct randint_source *, randint genmax); + +/* Consume random data from *S to generate a random number in the range + 0 .. CHOICES-1. CHOICES must be nonzero. */ +static inline randint +randint_choose (struct randint_source *s, randint choices) +{ + return randint_genmax (s, choices - 1); +} + +void randint_free (struct randint_source *); +int randint_all_free (struct randint_source *); + +#endif -- cgit v1.2.3-70-g09d2