1 | ; $Id: strncpy.asm 76553 2019-01-01 01:45:53Z vboxsync $
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2 | ;; @file
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3 | ; IPRT - No-CRT strncpy - AMD64 & X86.
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2006-2019 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 | %include "iprt/asmdefs.mac"
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28 |
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29 | BEGINCODE
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30 |
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31 | ;;
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32 | ; @param pszDst gcc: rdi msc: rcx x86:[esp+4] wcall: eax
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33 | ; @param pszSrc gcc: rsi msc: rdx x86:[esp+8] wcall: edx
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34 | ; @param cbMax gcc: rdx msc: r8 x86:[esp+12] wcall: ebx
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35 | RT_NOCRT_BEGINPROC strncpy
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36 | ; input
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37 | %ifdef RT_ARCH_AMD64
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38 | %ifdef ASM_CALL64_MSC
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39 | %define pszDst rcx
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40 | %define pszSrc rdx
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41 | %define cbMax r8
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42 | %else
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43 | %define pszDst rdi
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44 | %define pszSrc rsi
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45 | %define cbMax rdx
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46 | %endif
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47 | mov r9, pszDst
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48 | %else
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49 | %ifdef ASM_CALL32_WATCOM
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50 | mov ecx, eax
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51 | %define pszDst ecx
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52 | %define pszSrc edx
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53 | %define cbMax ebx
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54 | %else
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55 | mov ecx, [esp + 4]
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56 | mov edx, [esp + 8]
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57 | push ebx
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58 | mov ebx, [esp + 12 + 4]
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59 | %define pszDst ecx
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60 | %define pszSrc edx
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61 | %define cbMax ebx
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62 | %endif
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63 | push pszDst
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64 | %endif
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65 |
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66 | ;
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67 | ; The rolled out loop.
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68 | ;
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69 | .next:
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70 | cmp cbMax, 4
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71 | jb .simple_intro
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72 |
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73 | mov al, [pszSrc]
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74 | mov [pszDst], al
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75 | test al, al
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76 | jz .done
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77 |
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78 | mov al, [pszSrc + 1]
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79 | mov [pszDst + 1], al
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80 | test al, al
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81 | jz .done
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82 |
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83 | mov al, [pszSrc + 2]
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84 | mov [pszDst + 2], al
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85 | test al, al
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86 | jz .done
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87 |
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88 | mov al, [pszSrc + 3]
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89 | mov [pszDst + 3], al
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90 | test al, al
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91 | jz .done
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92 |
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93 | add pszDst, 4
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94 | add pszSrc, 4
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95 | sub cbMax, 4
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96 | jmp .next
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97 |
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98 | ;
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99 | ; Char by char.
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100 | ;
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101 | .simple_intro:
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102 | test cbMax, cbMax
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103 | jz .done
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104 |
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105 | .simple_next:
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106 | mov al, [pszSrc]
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107 | mov [pszDst], al
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108 | test al, al
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109 | jz .done
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110 |
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111 | dec cbMax
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112 | jz .done
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113 |
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114 | inc pszSrc
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115 | inc pszDst
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116 | jmp .simple_next
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117 |
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118 | .done:
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119 | %ifdef RT_ARCH_AMD64
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120 | mov rax, r9
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121 | %else
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122 | %ifndef ASM_CALL32_WATCOM
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123 | pop ebx
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124 | %endif
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125 | pop eax
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126 | %endif
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127 | ret
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128 | ENDPROC RT_NOCRT(strncpy)
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129 |
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