1 | /* $Id: SUPR3HardenedNoCrt.cpp 69496 2017-10-28 14:55:58Z vboxsync $ */
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2 | /** @file
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3 | * VirtualBox Support Library - Hardened main() no-crt routines.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2017 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #if RT_OS_WINDOWS
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32 | # include <iprt/win/windows.h>
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33 | #endif
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34 |
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35 | #include <VBox/sup.h>
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36 |
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37 | #include "SUPLibInternal.h"
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38 |
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39 |
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40 | #ifdef SUP_HARDENED_NEED_CRT_FUNCTIONS /** @todo this crap is obsolete. */
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41 |
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42 | /** memcmp */
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43 | DECLHIDDEN(int) suplibHardenedMemComp(void const *pvDst, const void *pvSrc, size_t cbToComp)
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44 | {
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45 | size_t const *puDst = (size_t const *)pvDst;
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46 | size_t const *puSrc = (size_t const *)pvSrc;
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47 | while (cbToComp >= sizeof(size_t))
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48 | {
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49 | if (*puDst != *puSrc)
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50 | break;
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51 | puDst++;
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52 | puSrc++;
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53 | cbToComp -= sizeof(size_t);
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54 | }
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55 |
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56 | uint8_t const *pbDst = (uint8_t const *)puDst;
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57 | uint8_t const *pbSrc = (uint8_t const *)puSrc;
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58 | while (cbToComp > 0)
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59 | {
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60 | if (*pbDst != *pbSrc)
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61 | {
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62 | if (*pbDst < *pbSrc)
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63 | return -1;
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64 | return 1;
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65 | }
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66 |
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67 | pbDst++;
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68 | pbSrc++;
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69 | cbToComp--;
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70 | }
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71 |
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72 | return 0;
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73 | }
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74 |
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75 |
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76 | /** memcpy */
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77 | DECLHIDDEN(void *) suplibHardenedMemCopy(void *pvDst, const void *pvSrc, size_t cbToCopy)
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78 | {
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79 | size_t *puDst = (size_t *)pvDst;
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80 | size_t const *puSrc = (size_t const *)pvSrc;
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81 | while (cbToCopy >= sizeof(size_t))
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82 | {
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83 | *puDst++ = *puSrc++;
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84 | cbToCopy -= sizeof(size_t);
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85 | }
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86 |
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87 | uint8_t *pbDst = (uint8_t *)puDst;
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88 | uint8_t const *pbSrc = (uint8_t const *)puSrc;
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89 | while (cbToCopy > 0)
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90 | {
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91 | *pbDst++ = *pbSrc++;
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92 | cbToCopy--;
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93 | }
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94 |
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95 | return pvDst;
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96 | }
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97 |
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98 |
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99 | /** memset */
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100 | DECLHIDDEN(void *) suplibHardenedMemSet(void *pvDst, int ch, size_t cbToSet)
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101 | {
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102 | uint8_t *pbDst = (uint8_t *)pvDst;
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103 | while (cbToSet > 0)
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104 | {
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105 | *pbDst++ = (uint8_t)ch;
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106 | cbToSet--;
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107 | }
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108 |
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109 | return pvDst;
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110 | }
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111 |
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112 |
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113 | /** strcpy */
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114 | DECLHIDDEN(char *) suplibHardenedStrCopy(char *pszDst, const char *pszSrc)
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115 | {
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116 | char *pszRet = pszDst;
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117 | char ch;
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118 | do
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119 | {
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120 | ch = *pszSrc++;
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121 | *pszDst++ = ch;
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122 | } while (ch);
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123 | return pszRet;
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124 | }
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125 |
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126 |
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127 | /** strlen */
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128 | DECLHIDDEN(size_t) suplibHardenedStrLen(const char *psz)
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129 | {
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130 | const char *pszStart = psz;
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131 | while (*psz)
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132 | psz++;
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133 | return psz - pszStart;
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134 | }
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135 |
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136 |
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137 | /** strcat */
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138 | DECLHIDDEN(char *) suplibHardenedStrCat(char *pszDst, const char *pszSrc)
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139 | {
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140 | char *pszRet = pszDst;
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141 | while (*pszDst)
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142 | pszDst++;
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143 | suplibHardenedStrCopy(pszDst, pszSrc);
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144 | return pszRet;
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145 | }
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146 |
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147 |
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148 | /** strcmp */
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149 | DECLHIDDEN(int) suplibHardenedStrCmp(const char *psz1, const char *psz2)
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150 | {
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151 | for (;;)
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152 | {
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153 | char ch1 = *psz1++;
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154 | char ch2 = *psz2++;
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155 | if (ch1 != ch2)
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156 | return ch1 < ch2 ? -1 : 1;
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157 | if (ch1 == 0)
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158 | return 0;
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159 | }
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160 | }
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161 |
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162 |
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163 | /** strncmp */
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164 | DECLHIDDEN(int) suplibHardenedStrNCmp(const char *psz1, const char *psz2, size_t cchMax)
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165 | {
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166 | while (cchMax-- > 0)
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167 | {
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168 | char ch1 = *psz1++;
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169 | char ch2 = *psz2++;
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170 | if (ch1 != ch2)
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171 | return ch1 < ch2 ? -1 : 1;
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172 | if (ch1 == 0)
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173 | break;
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174 | }
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175 | return 0;
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176 | }
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177 |
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178 | #endif /* SUP_HARDENED_NEED_CRT_FUNCTIONS */
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179 |
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