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test_bits.c
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/* test harness for bits.h
*
* This file is Copyright (c) 2010 by the GPSD project
* SPDX-License-Identifier: BSD-2-clause
*/
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include "bits.h"
static unsigned char buf[80];
static signed char sb1, sb2;
static unsigned char ub1, ub2;
static short sw1, sw2;
static unsigned short uw1, uw2;
static int sl1, sl2;
static unsigned int ul1, ul2;
static int64_t sL1, sL2;
static uint64_t uL1, uL2;
static float f1;
static double d1;
static char *hexdump(const void *binbuf, size_t len)
{
static char hexbuf[BUFSIZ];
size_t i, j = 0;
const char *ibuf = (const char *)binbuf;
const char *hexchar = "0123456789abcdef";
for (i = 0; i < len; i++) {
hexbuf[j++] = hexchar[(ibuf[i] & 0xf0) >> 4];
hexbuf[j++] = hexchar[ibuf[i] & 0x0f];
}
hexbuf[j] = '\0';
return hexbuf;
}
static void bedumpall(void)
{
(void)printf("getsb: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sb1, (uint64_t) sb2,
(uint64_t) getsb(buf, 0), (uint64_t) getsb(buf, 8));
(void)printf("getub: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) ub1, (uint64_t) ub2,
(uint64_t) getub(buf, 0), (uint64_t) getub(buf, 8));
(void)printf("getbes16: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sw1, (uint64_t) sw2,
(uint64_t) getbes16(buf, 0), (uint64_t) getbes16(buf, 8));
(void)printf("getbeu16: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) uw1, (uint64_t) uw2,
(uint64_t) getbeu16(buf, 0), (uint64_t) getbeu16(buf, 8));
(void)printf("getbes32: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sl1, (uint64_t) sl2,
(uint64_t) getbes32(buf, 0), (uint64_t) getbes32(buf, 8));
(void)printf("getbeu32: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) ul1, (uint64_t) ul2,
(uint64_t) getbeu32(buf, 0), (uint64_t) getbeu32(buf, 8));
(void)printf("getbes64: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sL1, (uint64_t) sL2,
(uint64_t) getbes64(buf, 0), (uint64_t) getbes64(buf, 8));
(void)printf("getbeu64: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) uL1, (uint64_t) uL2,
(uint64_t) getbeu64(buf, 0), (uint64_t) getbeu64(buf, 8));
(void)printf("getbef32: %f %f\n", f1, getbef32((const char *)buf, 24));
(void)printf("getbed64: %.16f %.16f\n", d1, getbed64((const char *)buf, 16));
}
static void ledumpall(void)
{
(void)printf("getsb: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sb1, (uint64_t) sb2,
(uint64_t) getsb(buf, 0), (uint64_t) getsb(buf, 8));
(void)printf("getub: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) ub1, (uint64_t) ub2,
(uint64_t) getub(buf, 0), (uint64_t) getub(buf, 8));
(void)printf("getles16: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sw1, (uint64_t) sw2,
(uint64_t) getles16(buf, 0), (uint64_t) getles16(buf, 8));
(void)printf("getleu16: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) uw1, (uint64_t) uw2,
(uint64_t) getleu16(buf, 0), (uint64_t) getleu16(buf, 8));
(void)printf("getles32: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sl1, (uint64_t) sl2,
(uint64_t) getles32(buf, 0), (uint64_t) getles32(buf, 8));
(void)printf("getleu32: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) ul1, (uint64_t) ul2,
(uint64_t) getleu32(buf, 0), (uint64_t) getleu32(buf, 8));
(void)printf("getles64: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) sL1, (uint64_t) sL2,
(uint64_t) getles64(buf, 0), (uint64_t) getles64(buf, 8));
(void)printf("getleu64: %016" PRIx64 " %016" PRIx64 " %016" PRIx64 " %016" PRIx64 "\n",
(uint64_t) uL1, (uint64_t) uL2,
(uint64_t) getleu64(buf, 0), (uint64_t) getleu64(buf, 8));
(void)printf("getlef32: %f %f\n", f1, getlef32((const char *)buf, 24));
(void)printf("getled64: %.16f %.16f\n", d1, getled64((const char *)buf, 16));
}
struct unsigned_test
{
unsigned char *buf;
unsigned int start, width;
uint64_t expected;
bool le;
char *description;
};
int main(int argc, char *argv[])
{
bool failures = false;
bool quiet = (argc > 1) && (strcmp(argv[1], "--quiet") == 0);
struct unsigned_test *up, unsigned_tests[] = {
/* tests using the big buffer */
{buf, 0, 1, 0, false, "first bit of first byte"},
{buf, 0, 8, 0x01, false, "first 8 bits"},
{buf, 32, 7, 0x02, false, "first seven bits of fifth byte (0x05)"},
{buf, 56, 12, 0x8f, false, "12 bits crossing 7th to 8th bytes (0x08ff)"},
{buf, 78, 4, 0xb, false, "4 bits crossing 8th to 9th byte (0xfefd)"},
{buf, 0, 1, 0, true, "first bit of first byte"},
{buf, 0, 8, 0x80, true, "first 8 bits"},
{buf, 32, 7, 0x20, true, "first seven bits of fifth byte (0x05)"},
{buf, 56, 12, 0xf10,true, "12 bits crossing 7th to 8th bytes (0x08ff)"},
{buf, 78, 4, 0xd, true, "4 bits crossing 8th to 9th byte (0xfefd)"},
/* sporadic tests based on found bugs */
{(unsigned char *)"\x19\x23\f6",
7, 2, 2, false, "2 bits crossing 1st to 2nd byte (0x1923)"},
};
memcpy(buf, "\x01\x02\x03\x04\x05\x06\x07\x08", 8);
memcpy(buf + 8, "\xff\xfe\xfd\xfc\xfb\xfa\xf9\xf8", 8);
memcpy(buf + 16, "\x40\x09\x21\xfb\x54\x44\x2d\x18", 8);
memcpy(buf + 24, "\x40\x49\x0f\xdb", 4);
if (!quiet)
(void)printf("Testing bitfield extraction\n");
sb1 = getsb(buf, 0);
sb2 = getsb(buf, 8);
ub1 = getub(buf, 0);
ub2 = getub(buf, 8);
if (!quiet) {
unsigned char *sp;
(void)fputs("Test data:", stdout);
for (sp = buf; sp < buf + 28; sp++)
(void)printf(" %02x", *sp);
(void)putc('\n', stdout);
/* big-endian test */
printf("Big-endian:\n");
sw1 = getbes16(buf, 0);
sw2 = getbes16(buf, 8);
uw1 = getbeu16(buf, 0);
uw2 = getbeu16(buf, 8);
sl1 = getbes32(buf, 0);
sl2 = getbes32(buf, 8);
ul1 = getbeu32(buf, 0);
ul2 = getbeu32(buf, 8);
sL1 = getbes64(buf, 0);
sL2 = getbes64(buf, 8);
uL1 = getbeu64(buf, 0);
uL2 = getbeu64(buf, 8);
f1 = getbef32((const char *)buf, 24);
d1 = getbed64((const char *)buf, 16);
bedumpall();
/* little-endian test */
printf("Little-endian:\n");
sw1 = getles16(buf, 0);
sw2 = getles16(buf, 8);
uw1 = getleu16(buf, 0);
uw2 = getleu16(buf, 8);
sl1 = getles32(buf, 0);
sl2 = getles32(buf, 8);
ul1 = getleu32(buf, 0);
ul2 = getleu32(buf, 8);
sL1 = getles64(buf, 0);
sL2 = getles64(buf, 8);
uL1 = getleu64(buf, 0);
uL2 = getleu64(buf, 8);
f1 = getlef32((const char *)buf, 24);
d1 = getled64((const char *)buf, 16);
ledumpall();
}
if (sb1 != 1) printf("getsb(buf, 0) FAILED\n");
if (sb2 != -1) printf("getsb(buf, 8) FAILED\n");
if (ub1 != 1) printf("getub(buf, 0) FAILED\n");
if (ub2 != 0xff) printf("getub(buf, 8) FAILED\n");
for (up = unsigned_tests;
up <
unsigned_tests + sizeof(unsigned_tests) / sizeof(unsigned_tests[0]);
up++) {
uint64_t res = ubits((unsigned char *)buf, up->start, up->width, up->le);
bool success = (res == up->expected);
if (!success)
failures = true;
if (!success || !quiet)
(void)printf("ubits(%s, %d, %d, %s) %s should be %" PRIx64 ", is %" PRIx64 ": %s\n",
hexdump(buf, strlen((char *)buf)),
up->start, up->width, up->le ? "true" : "false",
up->description, up->expected, res,
success ? "succeeded" : "FAILED");
}
shiftleft(buf, 28, 30);
if (!quiet)
printf("Left-shifted 30 bits: %s\n", hexdump(buf, 28));
/*
* After the 24-bit shift, the bit array loses its first three bytes:
* 0x0405060708 = 00000100 00000101 00000110 00000111 00001000
* By inspection, the results of the 6-bit shift are
* 00000001 01000001 10000001 11000010 00
*/
#define LASSERT(n, v) if (buf[n] != v) printf("Expected buf[%d] to be %02x, was %02x\n", n, v, buf[n])
LASSERT(0, 0x01);
LASSERT(1, 0x41);
LASSERT(2, 0x81);
LASSERT(3, 0xc1);
#undef LASSERT
exit(failures ? EXIT_FAILURE : EXIT_SUCCESS);
}