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MdePkg/BaseLib: Add safe string functions [Ascii]StrnSizeS

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Add StrnSizeS() and AsciiStrnSizeS() APIs.

These 2 safe version APIs are used to replace StrSize() and
AsciiStrSize(). Those two APIs use similar checks as [Ascii]StrnLenS().

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
This commit is contained in:
Hao Wu
2016-12-09 15:53:06 +08:00
parent 3613af9139
commit b590e43ab6
2 changed files with 145 additions and 2 deletions
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56
MdePkg/Include/Library/BaseLib.h
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@@ -2,7 +2,7 @@
Provides string functions, linked list functions, math functions, synchronization
functions, file path functions, and CPU architecture-specific functions.
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@@ -207,6 +207,34 @@ StrnLenS (
IN UINTN MaxSize
);
/**
Returns the size of a Null-terminated Unicode string in bytes, including the
Null terminator.
This function returns the size of the Null-terminated Unicode string
specified by String in bytes, including the Null terminator.
If String is not aligned on a 16-bit boundary, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@param MaxSize The maximum number of Destination Unicode
char, including the Null terminator.
@retval 0 If String is NULL.
@retval (sizeof (CHAR16) * (MaxSize + 1))
If there is no Null terminator in the first MaxSize characters of
String.
@return The size of the Null-terminated Unicode string in bytes, including
the Null terminator.
**/
UINTN
EFIAPI
StrnSizeS (
IN CONST CHAR16 *String,
IN UINTN MaxSize
);
/**
Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination.
@@ -382,6 +410,32 @@ AsciiStrnLenS (
IN UINTN MaxSize
);
/**
Returns the size of a Null-terminated Ascii string in bytes, including the
Null terminator.
This function returns the size of the Null-terminated Ascii string specified
by String in bytes, including the Null terminator.
@param String A pointer to a Null-terminated Ascii string.
@param MaxSize The maximum number of Destination Ascii
char, including the Null terminator.
@retval 0 If String is NULL.
@retval (sizeof (CHAR8) * (MaxSize + 1))
If there is no Null terminator in the first MaxSize characters of
String.
@return The size of the Null-terminated Ascii string in bytes, including the
Null terminator.
**/
UINTN
EFIAPI
AsciiStrnSizeS (
IN CONST CHAR8 *String,
IN UINTN MaxSize
);
/**
Copies the string pointed to by Source (including the terminating null char)
to the array pointed to by Destination.