MdePkg/BaseLib: Add safe string functions [U|A]StrnTo[A|U]StrS
Add the following 2 APIs: UnicodeStrnToAsciiStrS AsciiStrnToUnicodeStrS These APIs are used to enhance APIs UnicodeStrToAsciiStrS and AsciiStrToUnicodeStrS (without 'n' in names) by: 1. Adds an input parameter 'Length' to specify the maximum number of Ascii/Unicode characters to convert. 2. Adds an output parameter 'DestinationLength' to indicate the number of Ascii/Unicode characters successfully converted. 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>
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Hao Wu
@@ -1631,6 +1631,60 @@ UnicodeStrToAsciiStrS (
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IN UINTN DestMax
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);
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/**
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Convert not more than Length successive characters from a Null-terminated
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Unicode string to a Null-terminated Ascii string. If no null char is copied
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from Source, then Destination[Length] is always set to null.
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This function converts not more than Length successive characters from the
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Unicode string Source to the Ascii string Destination by copying the lower 8
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bits of each Unicode character. The function terminates the Ascii string
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Destination by appending a Null-terminator character at the end.
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The caller is responsible to make sure Destination points to a buffer with size
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equal or greater than ((StrLen (Source) + 1) * sizeof (CHAR8)) in bytes.
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If any Unicode characters in Source contain non-zero value in the upper 8
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bits, then ASSERT().
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If Source is not aligned on a 16-bit boundary, then ASSERT().
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If an error would be returned, then the function will also ASSERT().
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If an error is returned, then the Destination is unmodified.
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@param Source The pointer to a Null-terminated Unicode string.
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@param Length The maximum number of Unicode characters to
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convert.
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@param Destination The pointer to a Null-terminated Ascii string.
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@param DestMax The maximum number of Destination Ascii
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char, including terminating null char.
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@param DestinationLength The number of Unicode characters converted.
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@retval RETURN_SUCCESS String is converted.
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@retval RETURN_INVALID_PARAMETER If Destination is NULL.
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If Source is NULL.
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If DestinationLength is NULL.
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If PcdMaximumAsciiStringLength is not zero,
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and Length or DestMax is greater than
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PcdMaximumAsciiStringLength.
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If PcdMaximumUnicodeStringLength is not
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zero, and Length or DestMax is greater than
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PcdMaximumUnicodeStringLength.
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If DestMax is 0.
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@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than
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MIN(StrLen(Source), Length).
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@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
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**/
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RETURN_STATUS
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EFIAPI
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UnicodeStrnToAsciiStrS (
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IN CONST CHAR16 *Source,
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IN UINTN Length,
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OUT CHAR8 *Destination,
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IN UINTN DestMax,
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OUT UINTN *DestinationLength
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);
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#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
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/**
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@@ -2218,6 +2272,59 @@ AsciiStrToUnicodeStrS (
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IN UINTN DestMax
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);
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/**
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Convert not more than Length successive characters from a Null-terminated
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Ascii string to a Null-terminated Unicode string. If no null char is copied
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from Source, then Destination[Length] is always set to null.
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This function converts not more than Length successive characters from the
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Ascii string Source to the Unicode string Destination. The function
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terminates the Unicode string Destination by appending a Null-terminator
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character at the end.
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The caller is responsible to make sure Destination points to a buffer with
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size not smaller than
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((MIN(AsciiStrLen(Source), Length) + 1) * sizeof (CHAR8)) in bytes.
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If Destination is not aligned on a 16-bit boundary, then ASSERT().
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If an error would be returned, then the function will also ASSERT().
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If an error is returned, then Destination and DestinationLength are
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unmodified.
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@param Source The pointer to a Null-terminated Ascii string.
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@param Length The maximum number of Ascii characters to convert.
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@param Destination The pointer to a Null-terminated Unicode string.
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@param DestMax The maximum number of Destination Unicode char,
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including terminating null char.
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@param DestinationLength The number of Ascii characters converted.
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@retval RETURN_SUCCESS String is converted.
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@retval RETURN_INVALID_PARAMETER If Destination is NULL.
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If Source is NULL.
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If DestinationLength is NULL.
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If PcdMaximumUnicodeStringLength is not
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zero, and Length or DestMax is greater than
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PcdMaximumUnicodeStringLength.
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If PcdMaximumAsciiStringLength is not zero,
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and Length or DestMax is greater than
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PcdMaximumAsciiStringLength.
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If DestMax is 0.
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@retval RETURN_BUFFER_TOO_SMALL If DestMax is NOT greater than
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MIN(AsciiStrLen(Source), Length).
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@retval RETURN_ACCESS_DENIED If Source and Destination overlap.
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**/
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RETURN_STATUS
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EFIAPI
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AsciiStrnToUnicodeStrS (
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IN CONST CHAR8 *Source,
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IN UINTN Length,
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OUT CHAR16 *Destination,
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IN UINTN DestMax,
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OUT UINTN *DestinationLength
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);
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/**
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Converts an 8-bit value to an 8-bit BCD value.
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