Mercurial > libjeffpc
view rand.c @ 712:8295148e8f44
buffer: rename internal 'used' member to a more obvious name
It really keeps track of the number of readable bytes in the buffer. In
other words, it keeps track of the size - hence the new name.
Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
author | Josef 'Jeff' Sipek <jeffpc@josefsipek.net> |
---|---|
date | Tue, 19 Mar 2019 14:43:26 -0400 |
parents | 6f8be69c0d8e |
children |
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/* * Copyright (c) 2015-2018 Josef 'Jeff' Sipek <jeffpc@josefsipek.net> * Copyright (c) 2015 Holly Sipek * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include <inttypes.h> #include <jeffpc/rand.h> #include <jeffpc/config.h> #include <jeffpc/error.h> #include <jeffpc/io.h> uint32_t rand32(void) { #ifdef JEFFPC_HAVE_ARC4RANDOM return arc4random(); #else uint32_t val; int ret; int fd; fd = xopen("/dev/urandom", O_RDONLY, 0); if (fd < 0) panic("Failed to get random number: %s", xstrerror(fd)); ret = xread(fd, &val, sizeof(val)); if (ret) panic("Failed to get random number: %s", xstrerror(ret)); xclose(fd); return val; #endif } uint64_t rand64(void) { uint64_t tmp; tmp = rand32(); tmp <<= 32; tmp |= rand32(); return tmp; } void rand_buf(void *buf, size_t len) { #ifdef JEFFPC_HAVE_ARC4RANDOM_BUF arc4random_buf(buf, len); #else int ret; int fd; fd = xopen("/dev/urandom", O_RDONLY, 0); if (fd < 0) panic("Failed to get random buffer: %s", xstrerror(fd)); ret = xread(fd, buf, len); if (ret) panic("Failed to get random buffer: %s", xstrerror(ret)); xclose(fd); #endif }