VirtualBox

source: vbox/trunk/src/VBox/Disassembler/DisasmFormatBytes.cpp@ 25658

Last change on this file since 25658 was 18449, checked in by vboxsync, 16 years ago

DisasmFormatBytes.cpp: size_t warning.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 3.3 KB
Line 
1/* $Id: DisasmFormatBytes.cpp 18449 2009-03-28 03:35:50Z vboxsync $ */
2/** @file
3 * VBox Disassembler - Helper for formatting the opcode bytes.
4 */
5
6/*
7 * Copyright (C) 2008 Sun Microsystems, Inc.
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18 * Clara, CA 95054 USA or visit http://www.sun.com if you need
19 * additional information or have any questions.
20 */
21
22
23/*******************************************************************************
24* Header Files *
25*******************************************************************************/
26#include "DisasmInternal.h"
27#include <iprt/string.h>
28#include <iprt/assert.h>
29#include <iprt/err.h>
30
31
32/**
33 * Helper function for formatting the opcode bytes.
34 *
35 * @returns The number of output bytes.
36 *
37 * @param pCpu Pointer to the disassembler cpu state.
38 * @param pszDst The output buffer.
39 * @param cchDst The size of the output buffer.
40 * @param fFlags The flags passed to the formatter.
41 */
42size_t disFormatBytes(PCDISCPUSTATE pCpu, char *pszDst, size_t cchDst, uint32_t fFlags)
43{
44 /*
45 * Read the bytes first.
46 */
47 uint8_t ab[16];
48 uint32_t cb = pCpu->opsize;
49 Assert(cb <= 16);
50 if (cb > 16)
51 cb = 16;
52
53 if (pCpu->pfnReadBytes)
54 {
55 int rc = pCpu->pfnReadBytes(pCpu->opaddr, &ab[0], cb, (void *)pCpu);
56 if (RT_FAILURE(rc))
57 {
58 for (uint32_t i = 0; i < cb; i++)
59 {
60 int rc2 = pCpu->pfnReadBytes(pCpu->opaddr + i, &ab[i], 1, (void *)pCpu);
61 if (RT_FAILURE(rc2))
62 ab[i] = 0xcc;
63 }
64 }
65 }
66 else
67 {
68 uint8_t const *pabSrc = (uint8_t const *)(uintptr_t)pCpu->opaddr;
69 for (uint32_t i = 0; i < cb; i++)
70 ab[i] = pabSrc[i];
71 }
72
73 /*
74 * Now for the output.
75 */
76 size_t cchOutput = 0;
77#define PUT_C(ch) \
78 do { \
79 cchOutput++; \
80 if (cchDst > 1) \
81 { \
82 cchDst--; \
83 *pszDst++ = (ch); \
84 } \
85 } while (0)
86#define PUT_NUM(cch, fmt, num) \
87 do { \
88 cchOutput += (cch); \
89 if (cchDst > 1) \
90 { \
91 const size_t cchTmp = RTStrPrintf(pszDst, cchDst, fmt, (num)); \
92 pszDst += cchTmp; \
93 cchDst -= cchTmp; \
94 } \
95 } while (0)
96
97
98 if (fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS)
99 PUT_C('[');
100
101 for (uint32_t i = 0; i < cb; i++)
102 {
103 if (i != 0 && (fFlags & DIS_FMT_FLAGS_BYTES_SPACED))
104 PUT_NUM(3, " %02x", ab[i]);
105 else
106 PUT_NUM(2, "%02x", ab[i]);
107 }
108
109 if (fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS)
110 PUT_C(']');
111
112 /* Terminate it just in case. */
113 if (cchDst >= 1)
114 *pszDst = '\0';
115
116#undef PUT_C
117#undef PUT_NUM
118 return cchOutput;
119}
120
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