haiku-beta6/src/bin/debug/strace/Context.cpp

/*
 * Copyright 2007, Haiku Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 * 		Hugo Santos <[email protected]>
 * 		Ingo Weinhold <[email protected]>
 */

#include "Context.h"

#include <stdio.h>
#include <string.h>


Parameter *
Context::GetNextSibling(Parameter *param) const
{
	for (int32 i = 0; i + 1 < fSyscall->CountParameters(); i++) {
		if (fSyscall->ParameterAt(i) == param)
			return fSyscall->ParameterAt(i + 1);
	}
	return NULL;
}


string
Context::FormatSigned(int64 value, int bytes) const
{
	char tmp[32];

	// decimal

	if (fDecimal) {
		snprintf(tmp, sizeof(tmp), "%" B_PRId64, value);
		return tmp;
	}

	// hex

	snprintf(tmp, sizeof(tmp), "0x%" B_PRIx64, value);

	// Negative numbers are expanded when being converted to int64. Hence
	// we skip all but the last 2 * bytes hex digits to retain the original
	// type's width.
	int len = strlen(tmp);
	int offset = len - min_c(len, bytes * 2);

	// use the existing "0x" prefix or prepend it again
	if (offset <= 2) {
		offset = 0;
	} else {
		tmp[--offset] = 'x';
		tmp[--offset] = '0';
	}

	return tmp + offset;
}

string
Context::FormatUnsigned(uint64 value) const
{
	char tmp[32];
	snprintf(tmp, sizeof(tmp), fDecimal ? "%" B_PRIu64 : "0x%" B_PRIx64, value);
	return tmp;
}

string
Context::FormatFlags(uint64 value) const
{
	char tmp[32];
	snprintf(tmp, sizeof(tmp), "0x%" B_PRIx64, value);
	return tmp;
}

string
Context::FormatPointer(const void *address) const
{
	char buffer[32];
	sprintf(buffer, "%p", address);
	return buffer;
}