From 2bf851de6dd3a64f91a72a9afba2b3637dbbe154 Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Thu, 4 Dec 2025 19:25:47 +0100 Subject: First commit MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- libj2_ju_lrot_to_j2u.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 libj2_ju_lrot_to_j2u.c (limited to 'libj2_ju_lrot_to_j2u.c') diff --git a/libj2_ju_lrot_to_j2u.c b/libj2_ju_lrot_to_j2u.c new file mode 100644 index 0000000..25df836 --- /dev/null +++ b/libj2_ju_lrot_to_j2u.c @@ -0,0 +1,64 @@ +/* See LICENSE file for copyright and license details. */ +#include "common.h" +#ifndef TEST + +extern inline void libj2_ju_lrot_to_j2u(uintmax_t a, unsigned b, struct libj2_j2u *res); +/* TODO Add man page */ + + +#else + +static void +set(struct libj2_j2u *a, const char *pattern, unsigned shift) +{ + unsigned i, j = (LIBJ2_J2U_BIT - (shift % LIBJ2_J2U_BIT)) % LIBJ2_J2U_BIT; + + a->high = 0; + a->low = 0; + + for (i = 0; i < LIBJ2_JU_BIT; i++, j++) + if (pattern[j % LIBJ2_J2U_BIT] == '1') + a->low |= (uintmax_t)1 << i; + + for (i = 0; i < LIBJ2_JU_BIT; i++, j++) + if (pattern[j % LIBJ2_J2U_BIT] == '1') + a->high |= (uintmax_t)1 << i; + +} + + +int +main(void) +{ + struct libj2_j2u a, r, expected; + char pattern[LIBJ2_J2U_BIT + 1U]; + unsigned i, j, k; + + srand((unsigned)time(NULL)); + + for (i = 0; i < 128U; i++) { + for (j = 0; j < LIBJ2_JU_BIT; j++) + pattern[j] = '0' + (rand() < rand()); + memset(&pattern[LIBJ2_JU_BIT], '0', LIBJ2_JU_BIT); + pattern[LIBJ2_J2U_BIT] = '\0'; + set(&a, pattern, 0); + EXPECT(a.high == 0); + for (j = 0; j <= 2U * LIBJ2_J2U_BIT; j++) { + set(&expected, pattern, j); + + r = (struct libj2_j2u){111, 222}; + libj2_ju_lrot_to_j2u(a.low, j, &r); + EXPECT(libj2_j2u_eq_j2u(&r, &expected)); + + k = 2U * LIBJ2_J2U_BIT - j; + + r = (struct libj2_j2u){111, 222}; + libj2_ju_rrot_to_j2u(a.low, k, &r); + EXPECT(libj2_j2u_eq_j2u(&r, &expected)); + } + } + + return 0; +} + +#endif -- cgit v1.2.3-70-g09d2