diff options
Diffstat (limited to 'scripts/bitfuncgen.c')
| -rw-r--r-- | scripts/bitfuncgen.c | 42 |
1 files changed, 25 insertions, 17 deletions
diff --git a/scripts/bitfuncgen.c b/scripts/bitfuncgen.c index 8fae531b..b7f18cfd 100644 --- a/scripts/bitfuncgen.c +++ b/scripts/bitfuncgen.c @@ -3,7 +3,7 @@ * * SPDX-License-Identifier: BSD-2-Clause * - * Copyright (c) 2018-2021 Gavin D. Howard and contributors. + * Copyright (c) 2018-2023 Gavin D. Howard and contributors. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: @@ -47,17 +47,21 @@ * Abort with an error message. * @param msg The error message. */ -void err(const char *msg) { +void +err(const char* msg) +{ fprintf(stderr, "%s\n", msg); abort(); } -uint64_t rev(uint64_t a, size_t bits) { - +uint64_t +rev(uint64_t a, size_t bits) +{ size_t i; uint64_t res = 0; - for (i = 0; i < bits; ++i) { + for (i = 0; i < bits; ++i) + { res <<= 1; res |= a & 1; a >>= 1; @@ -66,8 +70,9 @@ uint64_t rev(uint64_t a, size_t bits) { return res; } -uint64_t mod(uint64_t a, size_t bits) { - +uint64_t +mod(uint64_t a, size_t bits) +{ uint64_t mod; if (bits < 64) mod = (uint64_t) ((1ULL << bits) - 1); @@ -76,8 +81,9 @@ uint64_t mod(uint64_t a, size_t bits) { return a & mod; } -uint64_t rol(uint64_t a, uint64_t p, size_t bits) { - +uint64_t +rol(uint64_t a, uint64_t p, size_t bits) +{ uint64_t res; assert(bits <= 64); @@ -91,8 +97,9 @@ uint64_t rol(uint64_t a, uint64_t p, size_t bits) { return mod(res, bits); } -uint64_t ror(uint64_t a, uint64_t p, size_t bits) { - +uint64_t +ror(uint64_t a, uint64_t p, size_t bits) +{ uint64_t res; assert(bits <= 64); @@ -106,24 +113,25 @@ uint64_t ror(uint64_t a, uint64_t p, size_t bits) { return mod(res, bits); } -int main(void) { - +int +main(void) +{ uint64_t a = 0, b = 0, t; size_t i; // We attempt to open this or /dev/random to get random data. int fd = open("/dev/urandom", O_RDONLY); - if (fd < 0) { - + if (fd < 0) + { fd = open("/dev/random", O_RDONLY); if (fd < 0) err("cannot open a random number generator"); } // Generate NTESTS tests. - for (i = 0; i < NTESTS; ++i) { - + for (i = 0; i < NTESTS; ++i) + { ssize_t nread; // Generate random data for the first operand. |