path: root/testutil/to-tracee-endian.c

/* See LICENSE file for copyright and license details. */
#include "../libsyscalls.h"

#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#if defined(__clang__)
# pragma clang diagnostic ignored "-Wunsafe-buffer-usage" /* clang is just being silly */
#endif


static void
make_hex(char *out, const char *in, size_t n)
{
	for (; n--; in++) {
		*out++ = "0123456789ABCDEF"[((unsigned)*in >> 4) & 0xFU];
		*out++ = "0123456789ABCDEF"[((unsigned)*in >> 0) & 0xFU];
	}
	*out = '\0';
}


int
main(int argc, char **argv)
{
	struct libsyscalls_datatype_description type;
	char *data, *end, *text0, *text1;
	size_t dataoff, i, datasize;
	unsigned long long int value;
	enum libsyscalls_error err;

	_Static_assert(CHAR_BIT, "We only support 8-bit char at the moment in testutil/to-tracee-endian.c");

	if (argc < 5) {
	usage:
		fprintf(stderr, "usage error\n");
		return 1;
	}

#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wconversion"
#endif

	errno = 0;
	value = strtoull(argv[1], &end, 16);
	if (errno || *end)
		goto usage;
	dataoff = (size_t)atol(argv[2]);
	type.width_in_bits = (unsigned short int)atoi(argv[3]);
	argv = &argv[4];
	i = 0;
	for (; argv[i] && i < sizeof(type.byteorder) / sizeof(*type.byteorder); i++)
		type.byteorder[i] = (unsigned)atoi(argv[i]);
	if (argv[i])
		goto usage;
	for (; i < sizeof(type.byteorder) / sizeof(*type.byteorder); i++) {
		type.byteorder[i] = 0U;
		type.byteorder[i] = ~type.byteorder[i];
	}

#if defined(__clang__)
# pragma GCC diagnostic pop
#endif

	datasize = ((size_t)type.width_in_bits + dataoff + 7UL) / 8UL;
	data = malloc(datasize);
	text0 = malloc(datasize * 2UL + 1UL);
	text1 = malloc(datasize * 2UL + 1UL);

	memset(data, 0, datasize);
	err = libsyscalls_to_tracee_endian(value, &type, data, dataoff);
	if (err == LIBSYSCALLS_E_INVAL) {
		printf("inval\n");
		free(data);
		goto out;
	} else if (err) {
		libsyscalls_perror(NULL, err);
		return 1;
	}
	make_hex(text0, data, datasize);

	memset(data, ~0, datasize);
	err = libsyscalls_to_tracee_endian(value, &type, data, dataoff);
	if (err == LIBSYSCALLS_E_INVAL) {
		printf("inval\n");
		free(data);
		goto out;
	} else if (err) {
		libsyscalls_perror(NULL, err);
		return 1;
	}
	make_hex(text1, data, datasize);

	free(data);

	printf("%s %s\n", text0, text1);

	free(text0);
	free(text1);

out:
	if (fflush(stdout) || fclose(stdout)) {
		perror(NULL);
		return 1;
	}
	return 0;
}