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/* Test of <endian.h> substitute.
Copyright (C) 2024-2025 Free Software Foundation, Inc.
This file 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 3 of the License,
or (at your option) any later version.
This file 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, see <https://www.gnu.org/licenses/>. */
/* Written by Collin Funk <collin.funk1@gmail.com>, 2024. */
#include <config.h>
/* Specification. */
#include <endian.h>
/* Check for uint16_t and uint32_t. */
uint16_t t1;
uint32_t t2;
/* The next POSIX revision requires 64-bit types. Gnulib doesn't. */
#if 0
uint64_t t3;
#endif
/* "These macros shall be suitable for use in #if preprocessing directives." */
#if BYTE_ORDER == LITTLE_ENDIAN
int a = 17;
#endif
#if BYTE_ORDER == BIG_ENDIAN
int a = 19;
#endif
/* "The macros BIG_ENDIAN and LITTLE_ENDIAN shall have distinct values." */
static_assert (LITTLE_ENDIAN != BIG_ENDIAN);
static_assert (BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == BIG_ENDIAN);
#include <stdint.h>
#include "macros.h"
/* Test byte order conversion functions with constant values. */
static void
test_convert_constant (void)
{
#if BYTE_ORDER == BIG_ENDIAN
/* 16-bit. */
ASSERT (be16toh (UINT16_C (0x1234)) == UINT16_C (0x1234));
ASSERT (htobe16 (UINT16_C (0x1234)) == UINT16_C (0x1234));
ASSERT (le16toh (UINT16_C (0x1234)) == UINT16_C (0x3412));
ASSERT (htole16 (UINT16_C (0x1234)) == UINT16_C (0x3412));
/* 32-bit. */
ASSERT (be32toh (UINT32_C (0x12345678)) == UINT32_C (0x12345678));
ASSERT (htobe32 (UINT32_C (0x12345678)) == UINT32_C (0x12345678));
ASSERT (le32toh (UINT32_C (0x12345678)) == UINT32_C (0x78563412));
ASSERT (htole32 (UINT32_C (0x12345678)) == UINT32_C (0x78563412));
/* 64-bit. */
# ifdef UINT64_MAX
ASSERT (be64toh (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0x1234567890ABCDEF));
ASSERT (htobe64 (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0x1234567890ABCDEF));
ASSERT (le64toh (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0xEFCDAB9078563412));
ASSERT (htole64 (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0xEFCDAB9078563412));
# endif
#else
/* 16-bit. */
ASSERT (be16toh (UINT16_C (0x1234)) == UINT16_C (0x3412));
ASSERT (htobe16 (UINT16_C (0x1234)) == UINT16_C (0x3412));
ASSERT (le16toh (UINT16_C (0x1234)) == UINT16_C (0x1234));
ASSERT (htole16 (UINT16_C (0x1234)) == UINT16_C (0x1234));
/* 32-bit. */
ASSERT (be32toh (UINT32_C (0x12345678)) == UINT32_C (0x78563412));
ASSERT (htobe32 (UINT32_C (0x12345678)) == UINT32_C (0x78563412));
ASSERT (le32toh (UINT32_C (0x12345678)) == UINT32_C (0x12345678));
ASSERT (htole32 (UINT32_C (0x12345678)) == UINT32_C (0x12345678));
/* 64-bit. */
# ifdef UINT64_MAX
ASSERT (be64toh (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0xEFCDAB9078563412));
ASSERT (htobe64 (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0xEFCDAB9078563412));
ASSERT (le64toh (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0x1234567890ABCDEF));
ASSERT (htole64 (UINT64_C (0x1234567890ABCDEF))
== UINT64_C (0x1234567890ABCDEF));
# endif
#endif
}
/* Test that the byte order conversion functions evaluate their
arguments once. */
static void
test_convert_eval_once (void)
{
/* 16-bit. */
{
uint16_t value = 0;
ASSERT (be16toh (value++) == 0);
ASSERT (value == 1);
}
{
uint16_t value = 0;
ASSERT (htobe16 (value++) == 0);
ASSERT (value == 1);
}
{
uint16_t value = 0;
ASSERT (le16toh (value++) == 0);
ASSERT (value == 1);
}
{
uint16_t value = 0;
ASSERT (htole16 (value++) == 0);
ASSERT (value == 1);
}
/* 32-bit. */
{
uint32_t value = 0;
ASSERT (be32toh (value++) == 0);
ASSERT (value == 1);
}
{
uint32_t value = 0;
ASSERT (htobe32 (value++) == 0);
ASSERT (value == 1);
}
{
uint32_t value = 0;
ASSERT (le32toh (value++) == 0);
ASSERT (value == 1);
}
{
uint32_t value = 0;
ASSERT (htole32 (value++) == 0);
ASSERT (value == 1);
}
/* 64-bit. */
#ifdef UINT64_MAX
{
uint64_t value = 0;
ASSERT (be64toh (value++) == 0);
ASSERT (value == 1);
}
{
uint64_t value = 0;
ASSERT (htobe64 (value++) == 0);
ASSERT (value == 1);
}
{
uint64_t value = 0;
ASSERT (le64toh (value++) == 0);
ASSERT (value == 1);
}
{
uint64_t value = 0;
ASSERT (htole64 (value++) == 0);
ASSERT (value == 1);
}
#endif
}
/* Test that the byte order conversion functions accept floating-point
arguments. */
static void
test_convert_double (void)
{
/* 16-bit. */
ASSERT (be16toh (0.0) == 0);
ASSERT (htobe16 (0.0) == 0);
ASSERT (le16toh (0.0) == 0);
ASSERT (htole16 (0.0) == 0);
/* 32-bit. */
ASSERT (be32toh (0.0) == 0);
ASSERT (htobe32 (0.0) == 0);
ASSERT (le32toh (0.0) == 0);
ASSERT (htole32 (0.0) == 0);
/* 64-bit. */
#ifdef UINT64_MAX
ASSERT (be64toh (0.0) == 0);
ASSERT (htobe64 (0.0) == 0);
ASSERT (le64toh (0.0) == 0);
ASSERT (htole64 (0.0) == 0);
#endif
}
int
main (void)
{
test_convert_constant ();
test_convert_eval_once ();
test_convert_double ();
return test_exit_status;
}
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