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mirror_edk2/MdePkg/Library/BaseLib/String.c
Hao Wu 95ba3d92dc MdePkg: Refine casting expression result to bigger size 
There are cases that the operands of an expression are all with rank less
than UINT64/INT64 and the result of the expression is explicitly cast to
UINT64/INT64 to fit the target size.

An example will be:
UINT32 a,b;
// a and b can be any unsigned int type with rank less than UINT64, like
// UINT8, UINT16, etc.
UINT64 c;
c = (UINT64) (a + b);

Some static code checkers may warn that the expression result might
overflow within the rank of "int" (integer promotions) and the result is
then cast to a bigger size.

The commit refines codes by the following rules:
1). When the expression is possible to overflow the range of unsigned int/
int:
c = (UINT64)a + b;

2). When the expression will not overflow within the rank of "int", remove
the explicit type casts:
c = a + b;

3). When the expression will be cast to pointer of possible greater size:
UINT32 a,b;
VOID *c;
c = (VOID *)(UINTN)(a + b); --> c = (VOID *)((UINTN)a + b);

4). When one side of a comparison expression contains only operands with
rank less than UINT32:
UINT8 a;
UINT16 b;
UINTN c;
if ((UINTN)(a + b) > c) {...} --> if (((UINT32)a + b) > c) {...}

For rule 4), if we remove the 'UINTN' type cast like:
if (a + b > c) {...}
The VS compiler will complain with warning C4018 (signed/unsigned
mismatch, level 3 warning) due to promoting 'a + b' to type 'int'.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2017-03-06 14:18:45 +08:00

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/** @file
Unicode and ASCII string primitives.
Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "BaseLibInternals.h"
#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
/**
[ATTENTION] This function will be deprecated for security reason.
Copies one Null-terminated Unicode string to another Null-terminated Unicode
string and returns the new Unicode string.
This function copies the contents of the Unicode string Source to the Unicode
string Destination, and returns Destination. If Source and Destination
overlap, then the results are undefined.
If Destination is NULL, then ASSERT().
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is NULL, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param Destination A pointer to a Null-terminated Unicode string.
@param Source A pointer to a Null-terminated Unicode string.
@return Destination.
**/
CHAR16 *
EFIAPI
StrCpy (
OUT CHAR16 *Destination,
IN CONST CHAR16 *Source
)
{
CHAR16 *ReturnValue;
//
// Destination cannot be NULL
//
ASSERT (Destination != NULL);
ASSERT (((UINTN) Destination & BIT0) == 0);
//
// Destination and source cannot overlap
//
ASSERT ((UINTN)(Destination - Source) > StrLen (Source));
ASSERT ((UINTN)(Source - Destination) > StrLen (Source));
ReturnValue = Destination;
while (*Source != 0) {
*(Destination++) = *(Source++);
}
*Destination = 0;
return ReturnValue;
}
/**
[ATTENTION] This function will be deprecated for security reason.
Copies up to a specified length from one Null-terminated Unicode string to
another Null-terminated Unicode string and returns the new Unicode string.
This function copies the contents of the Unicode string Source to the Unicode
string Destination, and returns Destination. At most, Length Unicode
characters are copied from Source to Destination. If Length is 0, then
Destination is returned unmodified. If Length is greater that the number of
Unicode characters in Source, then Destination is padded with Null Unicode
characters. If Source and Destination overlap, then the results are
undefined.
If Length > 0 and Destination is NULL, then ASSERT().
If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and Source is NULL, then ASSERT().
If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Length is greater than
PcdMaximumUnicodeStringLength, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param Destination A pointer to a Null-terminated Unicode string.
@param Source A pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to copy.
@return Destination.
**/
CHAR16 *
EFIAPI
StrnCpy (
OUT CHAR16 *Destination,
IN CONST CHAR16 *Source,
IN UINTN Length
)
{
CHAR16 *ReturnValue;
if (Length == 0) {
return Destination;
}
//
// Destination cannot be NULL if Length is not zero
//
ASSERT (Destination != NULL);
ASSERT (((UINTN) Destination & BIT0) == 0);
//
// Destination and source cannot overlap
//
ASSERT ((UINTN)(Destination - Source) > StrLen (Source));
ASSERT ((UINTN)(Source - Destination) >= Length);
if (PcdGet32 (PcdMaximumUnicodeStringLength) != 0) {
ASSERT (Length <= PcdGet32 (PcdMaximumUnicodeStringLength));
}
ReturnValue = Destination;
while ((*Source != L'\0') && (Length > 0)) {
*(Destination++) = *(Source++);
Length--;
}
ZeroMem (Destination, Length * sizeof (*Destination));
return ReturnValue;
}
#endif
/**
Returns the length of a Null-terminated Unicode string.
This function returns the number of Unicode characters in the Null-terminated
Unicode string specified by String.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@return The length of String.
**/
UINTN
EFIAPI
StrLen (
IN CONST CHAR16 *String
)
{
UINTN Length;
ASSERT (String != NULL);
ASSERT (((UINTN) String & BIT0) == 0);
for (Length = 0; *String != L'\0'; String++, Length++) {
//
// If PcdMaximumUnicodeStringLength is not zero,
// length should not more than PcdMaximumUnicodeStringLength
//
if (PcdGet32 (PcdMaximumUnicodeStringLength) != 0) {
ASSERT (Length < PcdGet32 (PcdMaximumUnicodeStringLength));
}
}
return Length;
}
/**
Returns the size of a Null-terminated Unicode string in bytes, including the
Null terminator.
This function returns the size, in bytes, of the Null-terminated Unicode string
specified by String.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@return The size of String.
**/
UINTN
EFIAPI
StrSize (
IN CONST CHAR16 *String
)
{
return (StrLen (String) + 1) * sizeof (*String);
}
/**
Compares two Null-terminated Unicode strings, and returns the difference
between the first mismatched Unicode characters.
This function compares the Null-terminated Unicode string FirstString to the
Null-terminated Unicode string SecondString. If FirstString is identical to
SecondString, then 0 is returned. Otherwise, the value returned is the first
mismatched Unicode character in SecondString subtracted from the first
mismatched Unicode character in FirstString.
If FirstString is NULL, then ASSERT().
If FirstString is not aligned on a 16-bit boundary, then ASSERT().
If SecondString is NULL, then ASSERT().
If SecondString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more
than PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more
than PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param FirstString A pointer to a Null-terminated Unicode string.
@param SecondString A pointer to a Null-terminated Unicode string.
@retval 0 FirstString is identical to SecondString.
@return others FirstString is not identical to SecondString.
**/
INTN
EFIAPI
StrCmp (
IN CONST CHAR16 *FirstString,
IN CONST CHAR16 *SecondString
)
{
//
// ASSERT both strings are less long than PcdMaximumUnicodeStringLength
//
ASSERT (StrSize (FirstString) != 0);
ASSERT (StrSize (SecondString) != 0);
while ((*FirstString != L'\0') && (*FirstString == *SecondString)) {
FirstString++;
SecondString++;
}
return *FirstString - *SecondString;
}
/**
Compares up to a specified length the contents of two Null-terminated Unicode strings,
and returns the difference between the first mismatched Unicode characters.
This function compares the Null-terminated Unicode string FirstString to the
Null-terminated Unicode string SecondString. At most, Length Unicode
characters will be compared. If Length is 0, then 0 is returned. If
FirstString is identical to SecondString, then 0 is returned. Otherwise, the
value returned is the first mismatched Unicode character in SecondString
subtracted from the first mismatched Unicode character in FirstString.
If Length > 0 and FirstString is NULL, then ASSERT().
If Length > 0 and FirstString is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and SecondString is NULL, then ASSERT().
If Length > 0 and SecondString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Length is greater than
PcdMaximumUnicodeStringLength, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and FirstString contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SecondString contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param FirstString A pointer to a Null-terminated Unicode string.
@param SecondString A pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to compare.
@retval 0 FirstString is identical to SecondString.
@return others FirstString is not identical to SecondString.
**/
INTN
EFIAPI
StrnCmp (
IN CONST CHAR16 *FirstString,
IN CONST CHAR16 *SecondString,
IN UINTN Length
)
{
if (Length == 0) {
return 0;
}
//
// ASSERT both strings are less long than PcdMaximumUnicodeStringLength.
// Length tests are performed inside StrLen().
//
ASSERT (StrSize (FirstString) != 0);
ASSERT (StrSize (SecondString) != 0);
if (PcdGet32 (PcdMaximumUnicodeStringLength) != 0) {
ASSERT (Length <= PcdGet32 (PcdMaximumUnicodeStringLength));
}
while ((*FirstString != L'\0') &&
(*SecondString != L'\0') &&
(*FirstString == *SecondString) &&
(Length > 1)) {
FirstString++;
SecondString++;
Length--;
}
return *FirstString - *SecondString;
}
#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
/**
[ATTENTION] This function will be deprecated for security reason.
Concatenates one Null-terminated Unicode string to another Null-terminated
Unicode string, and returns the concatenated Unicode string.
This function concatenates two Null-terminated Unicode strings. The contents
of Null-terminated Unicode string Source are concatenated to the end of
Null-terminated Unicode string Destination. The Null-terminated concatenated
Unicode String is returned. If Source and Destination overlap, then the
results are undefined.
If Destination is NULL, then ASSERT().
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is NULL, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Destination contains more
than PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination
and Source results in a Unicode string with more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param Destination A pointer to a Null-terminated Unicode string.
@param Source A pointer to a Null-terminated Unicode string.
@return Destination.
**/
CHAR16 *
EFIAPI
StrCat (
IN OUT CHAR16 *Destination,
IN CONST CHAR16 *Source
)
{
StrCpy (Destination + StrLen (Destination), Source);
//
// Size of the resulting string should never be zero.
// PcdMaximumUnicodeStringLength is tested inside StrLen().
//
ASSERT (StrSize (Destination) != 0);
return Destination;
}
/**
[ATTENTION] This function will be deprecated for security reason.
Concatenates up to a specified length one Null-terminated Unicode to the end
of another Null-terminated Unicode string, and returns the concatenated
Unicode string.
This function concatenates two Null-terminated Unicode strings. The contents
of Null-terminated Unicode string Source are concatenated to the end of
Null-terminated Unicode string Destination, and Destination is returned. At
most, Length Unicode characters are concatenated from Source to the end of
Destination, and Destination is always Null-terminated. If Length is 0, then
Destination is returned unmodified. If Source and Destination overlap, then
the results are undefined.
If Destination is NULL, then ASSERT().
If Length > 0 and Destination is not aligned on a 16-bit boundary, then ASSERT().
If Length > 0 and Source is NULL, then ASSERT().
If Length > 0 and Source is not aligned on a 16-bit boundary, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Length is greater than
PcdMaximumUnicodeStringLength, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Destination contains more
than PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and concatenating Destination
and Source results in a Unicode string with more than PcdMaximumUnicodeStringLength
Unicode characters, not including the Null-terminator, then ASSERT().
@param Destination A pointer to a Null-terminated Unicode string.
@param Source A pointer to a Null-terminated Unicode string.
@param Length The maximum number of Unicode characters to concatenate from
Source.
@return Destination.
**/
CHAR16 *
EFIAPI
StrnCat (
IN OUT CHAR16 *Destination,
IN CONST CHAR16 *Source,
IN UINTN Length
)
{
UINTN DestinationLen;
DestinationLen = StrLen (Destination);
StrnCpy (Destination + DestinationLen, Source, Length);
Destination[DestinationLen + Length] = L'\0';
//
// Size of the resulting string should never be zero.
// PcdMaximumUnicodeStringLength is tested inside StrLen().
//
ASSERT (StrSize (Destination) != 0);
return Destination;
}
#endif
/**
Returns the first occurrence of a Null-terminated Unicode sub-string
in a Null-terminated Unicode string.
This function scans the contents of the Null-terminated Unicode string
specified by String and returns the first occurrence of SearchString.
If SearchString is not found in String, then NULL is returned. If
the length of SearchString is zero, then String is
returned.
If String is NULL, then ASSERT().
If String is not aligned on a 16-bit boundary, then ASSERT().
If SearchString is NULL, then ASSERT().
If SearchString is not aligned on a 16-bit boundary, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and SearchString
or String contains more than PcdMaximumUnicodeStringLength Unicode
characters, not including the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@param SearchString A pointer to a Null-terminated Unicode string to search for.
@retval NULL If the SearchString does not appear in String.
@return others If there is a match.
**/
CHAR16 *
EFIAPI
StrStr (
IN CONST CHAR16 *String,
IN CONST CHAR16 *SearchString
)
{
CONST CHAR16 *FirstMatch;
CONST CHAR16 *SearchStringTmp;
//
// ASSERT both strings are less long than PcdMaximumUnicodeStringLength.
// Length tests are performed inside StrLen().
//
ASSERT (StrSize (String) != 0);
ASSERT (StrSize (SearchString) != 0);
if (*SearchString == L'\0') {
return (CHAR16 *) String;
}
while (*String != L'\0') {
SearchStringTmp = SearchString;
FirstMatch = String;
while ((*String == *SearchStringTmp)
&& (*String != L'\0')) {
String++;
SearchStringTmp++;
}
if (*SearchStringTmp == L'\0') {
return (CHAR16 *) FirstMatch;
}
if (*String == L'\0') {
return NULL;
}
String = FirstMatch + 1;
}
return NULL;
}
/**
Check if a Unicode character is a decimal character.
This internal function checks if a Unicode character is a
decimal character. The valid decimal character is from
L'0' to L'9'.
@param Char The character to check against.
@retval TRUE If the Char is a decmial character.
@retval FALSE If the Char is not a decmial character.
**/
BOOLEAN
EFIAPI
InternalIsDecimalDigitCharacter (
IN CHAR16 Char
)
{
return (BOOLEAN) (Char >= L'0' && Char <= L'9');
}
/**
Convert a Unicode character to upper case only if
it maps to a valid small-case ASCII character.
This internal function only deal with Unicode character
which maps to a valid small-case ASCII character, i.e.
L'a' to L'z'. For other Unicode character, the input character
is returned directly.
@param Char The character to convert.
@retval LowerCharacter If the Char is with range L'a' to L'z'.
@retval Unchanged Otherwise.
**/
CHAR16
EFIAPI
InternalCharToUpper (
IN CHAR16 Char
)
{
if (Char >= L'a' && Char <= L'z') {
return (CHAR16) (Char - (L'a' - L'A'));
}
return Char;
}
/**
Convert a Unicode character to numerical value.
This internal function only deal with Unicode character
which maps to a valid hexadecimal ASII character, i.e.
L'0' to L'9', L'a' to L'f' or L'A' to L'F'. For other
Unicode character, the value returned does not make sense.
@param Char The character to convert.
@return The numerical value converted.
**/
UINTN
EFIAPI
InternalHexCharToUintn (
IN CHAR16 Char
)
{
if (InternalIsDecimalDigitCharacter (Char)) {
return Char - L'0';
}
return (10 + InternalCharToUpper (Char) - L'A');
}
/**
Check if a Unicode character is a hexadecimal character.
This internal function checks if a Unicode character is a
decimal character. The valid hexadecimal character is
L'0' to L'9', L'a' to L'f', or L'A' to L'F'.
@param Char The character to check against.
@retval TRUE If the Char is a hexadecmial character.
@retval FALSE If the Char is not a hexadecmial character.
**/
BOOLEAN
EFIAPI
InternalIsHexaDecimalDigitCharacter (
IN CHAR16 Char
)
{
return (BOOLEAN) (InternalIsDecimalDigitCharacter (Char) ||
(Char >= L'A' && Char <= L'F') ||
(Char >= L'a' && Char <= L'f'));
}
/**
Convert a Null-terminated Unicode decimal string to a value of
type UINTN.
This function returns a value of type UINTN by interpreting the contents
of the Unicode string specified by String as a decimal number. The format
of the input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The
function will ignore the pad space, which includes spaces or
tab characters, before [decimal digits]. The running zero in the
beginning of [decimal digits] will be ignored. Then, the function
stops at the first character that is a not a valid decimal character
or a Null-terminator, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits,
then 0 is returned.
If the number represented by String overflows according
to the range defined by UINTN, then MAX_UINTN is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains
more than PcdMaximumUnicodeStringLength Unicode characters, not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINTN
EFIAPI
StrDecimalToUintn (
IN CONST CHAR16 *String
)
{
UINTN Result;
StrDecimalToUintnS (String, (CHAR16 **) NULL, &Result);
return Result;
}
/**
Convert a Null-terminated Unicode decimal string to a value of
type UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the Unicode string specified by String as a decimal number. The format
of the input Unicode string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The
function will ignore the pad space, which includes spaces or
tab characters, before [decimal digits]. The running zero in the
beginning of [decimal digits] will be ignored. Then, the function
stops at the first character that is a not a valid decimal character
or a Null-terminator, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits,
then 0 is returned.
If the number represented by String overflows according
to the range defined by UINT64, then MAX_UINT64 is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains
more than PcdMaximumUnicodeStringLength Unicode characters, not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINT64
EFIAPI
StrDecimalToUint64 (
IN CONST CHAR16 *String
)
{
UINT64 Result;
StrDecimalToUint64S (String, (CHAR16 **) NULL, &Result);
return Result;
}
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type UINTN.
This function returns a value of type UINTN by interpreting the contents
of the Unicode string specified by String as a hexadecimal number.
The format of the input Unicode string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
[hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
first valid hexadecimal digit. Then, the function stops at the first character that is
a not a valid hexadecimal character or NULL, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then zero is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
then zero is returned.
If the number represented by String overflows according to the range defined by
UINTN, then MAX_UINTN is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINTN
EFIAPI
StrHexToUintn (
IN CONST CHAR16 *String
)
{
UINTN Result;
StrHexToUintnS (String, (CHAR16 **) NULL, &Result);
return Result;
}
/**
Convert a Null-terminated Unicode hexadecimal string to a value of type UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the Unicode string specified by String as a hexadecimal number.
The format of the input Unicode string String is
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix.
If "x" appears in the input string, it must be prefixed with at least one 0.
The function will ignore the pad space, which includes spaces or tab characters,
before [zeros], [x] or [hexadecimal digit]. The running zero before [x] or
[hexadecimal digit] will be ignored. Then, the decoding starts after [x] or the
first valid hexadecimal digit. Then, the function stops at the first character that is
a not a valid hexadecimal character or NULL, whichever one comes first.
If String is NULL, then ASSERT().
If String is not aligned in a 16-bit boundary, then ASSERT().
If String has only pad spaces, then zero is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits,
then zero is returned.
If the number represented by String overflows according to the range defined by
UINT64, then MAX_UINT64 is returned.
If PcdMaximumUnicodeStringLength is not zero, and String contains more than
PcdMaximumUnicodeStringLength Unicode characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated Unicode string.
@retval Value translated from String.
**/
UINT64
EFIAPI
StrHexToUint64 (
IN CONST CHAR16 *String
)
{
UINT64 Result;
StrHexToUint64S (String, (CHAR16 **) NULL, &Result);
return Result;
}
/**
Check if a ASCII character is a decimal character.
This internal function checks if a Unicode character is a
decimal character. The valid decimal character is from
'0' to '9'.
@param Char The character to check against.
@retval TRUE If the Char is a decmial character.
@retval FALSE If the Char is not a decmial character.
**/
BOOLEAN
EFIAPI
InternalAsciiIsDecimalDigitCharacter (
IN CHAR8 Char
)
{
return (BOOLEAN) (Char >= '0' && Char <= '9');
}
/**
Check if a ASCII character is a hexadecimal character.
This internal function checks if a ASCII character is a
decimal character. The valid hexadecimal character is
L'0' to L'9', L'a' to L'f', or L'A' to L'F'.
@param Char The character to check against.
@retval TRUE If the Char is a hexadecmial character.
@retval FALSE If the Char is not a hexadecmial character.
**/
BOOLEAN
EFIAPI
InternalAsciiIsHexaDecimalDigitCharacter (
IN CHAR8 Char
)
{
return (BOOLEAN) (InternalAsciiIsDecimalDigitCharacter (Char) ||
(Char >= 'A' && Char <= 'F') ||
(Char >= 'a' && Char <= 'f'));
}
#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
/**
[ATTENTION] This function is deprecated for security reason.
Convert a Null-terminated Unicode string to a Null-terminated
ASCII string and returns the ASCII string.
This function converts the content of the Unicode string Source
to the ASCII string Destination by copying the lower 8 bits of
each Unicode character. It returns Destination.
The caller is responsible to make sure Destination points to a buffer with size
equal or greater than ((StrLen (Source) + 1) * sizeof (CHAR8)) in bytes.
If any Unicode characters in Source contain non-zero value in
the upper 8 bits, then ASSERT().
If Destination is NULL, then ASSERT().
If Source is NULL, then ASSERT().
If Source is not aligned on a 16-bit boundary, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Source contains
more than PcdMaximumUnicodeStringLength Unicode characters, not including
the Null-terminator, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Source contains more
than PcdMaximumAsciiStringLength Unicode characters, not including the
Null-terminator, then ASSERT().
@param Source A pointer to a Null-terminated Unicode string.
@param Destination A pointer to a Null-terminated ASCII string.
@return Destination.
**/
CHAR8 *
EFIAPI
UnicodeStrToAsciiStr (
IN CONST CHAR16 *Source,
OUT CHAR8 *Destination
)
{
CHAR8 *ReturnValue;
ASSERT (Destination != NULL);
//
// ASSERT if Source is long than PcdMaximumUnicodeStringLength.
// Length tests are performed inside StrLen().
//
ASSERT (StrSize (Source) != 0);
//
// Source and Destination should not overlap
//
ASSERT ((UINTN) (Destination - (CHAR8 *) Source) >= StrSize (Source));
ASSERT ((UINTN) ((CHAR8 *) Source - Destination) > StrLen (Source));
ReturnValue = Destination;
while (*Source != '\0') {
//
// If any Unicode characters in Source contain
// non-zero value in the upper 8 bits, then ASSERT().
//
ASSERT (*Source < 0x100);
*(Destination++) = (CHAR8) *(Source++);
}
*Destination = '\0';
//
// ASSERT Original Destination is less long than PcdMaximumAsciiStringLength.
// Length tests are performed inside AsciiStrLen().
//
ASSERT (AsciiStrSize (ReturnValue) != 0);
return ReturnValue;
}
/**
[ATTENTION] This function will be deprecated for security reason.
Copies one Null-terminated ASCII string to another Null-terminated ASCII
string and returns the new ASCII string.
This function copies the contents of the ASCII string Source to the ASCII
string Destination, and returns Destination. If Source and Destination
overlap, then the results are undefined.
If Destination is NULL, then ASSERT().
If Source is NULL, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and Source contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param Destination A pointer to a Null-terminated ASCII string.
@param Source A pointer to a Null-terminated ASCII string.
@return Destination
**/
CHAR8 *
EFIAPI
AsciiStrCpy (
OUT CHAR8 *Destination,
IN CONST CHAR8 *Source
)
{
CHAR8 *ReturnValue;
//
// Destination cannot be NULL
//
ASSERT (Destination != NULL);
//
// Destination and source cannot overlap
//
ASSERT ((UINTN)(Destination - Source) > AsciiStrLen (Source));
ASSERT ((UINTN)(Source - Destination) > AsciiStrLen (Source));
ReturnValue = Destination;
while (*Source != 0) {
*(Destination++) = *(Source++);
}
*Destination = 0;
return ReturnValue;
}
/**
[ATTENTION] This function will be deprecated for security reason.
Copies up to a specified length one Null-terminated ASCII string to another
Null-terminated ASCII string and returns the new ASCII string.
This function copies the contents of the ASCII string Source to the ASCII
string Destination, and returns Destination. At most, Length ASCII characters
are copied from Source to Destination. If Length is 0, then Destination is
returned unmodified. If Length is greater that the number of ASCII characters
in Source, then Destination is padded with Null ASCII characters. If Source
and Destination overlap, then the results are undefined.
If Destination is NULL, then ASSERT().
If Source is NULL, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Length is greater than
PcdMaximumAsciiStringLength, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Source contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param Destination A pointer to a Null-terminated ASCII string.
@param Source A pointer to a Null-terminated ASCII string.
@param Length The maximum number of ASCII characters to copy.
@return Destination
**/
CHAR8 *
EFIAPI
AsciiStrnCpy (
OUT CHAR8 *Destination,
IN CONST CHAR8 *Source,
IN UINTN Length
)
{
CHAR8 *ReturnValue;
if (Length == 0) {
return Destination;
}
//
// Destination cannot be NULL
//
ASSERT (Destination != NULL);
//
// Destination and source cannot overlap
//
ASSERT ((UINTN)(Destination - Source) > AsciiStrLen (Source));
ASSERT ((UINTN)(Source - Destination) >= Length);
if (PcdGet32 (PcdMaximumAsciiStringLength) != 0) {
ASSERT (Length <= PcdGet32 (PcdMaximumAsciiStringLength));
}
ReturnValue = Destination;
while (*Source != 0 && Length > 0) {
*(Destination++) = *(Source++);
Length--;
}
ZeroMem (Destination, Length * sizeof (*Destination));
return ReturnValue;
}
#endif
/**
Returns the length of a Null-terminated ASCII string.
This function returns the number of ASCII characters in the Null-terminated
ASCII string specified by String.
If Length > 0 and Destination is NULL, then ASSERT().
If Length > 0 and Source is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and String contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@return The length of String.
**/
UINTN
EFIAPI
AsciiStrLen (
IN CONST CHAR8 *String
)
{
UINTN Length;
ASSERT (String != NULL);
for (Length = 0; *String != '\0'; String++, Length++) {
//
// If PcdMaximumUnicodeStringLength is not zero,
// length should not more than PcdMaximumUnicodeStringLength
//
if (PcdGet32 (PcdMaximumAsciiStringLength) != 0) {
ASSERT (Length < PcdGet32 (PcdMaximumAsciiStringLength));
}
}
return Length;
}
/**
Returns the size of a Null-terminated ASCII string in bytes, including the
Null terminator.
This function returns the size, in bytes, of the Null-terminated ASCII string
specified by String.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and String contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@return The size of String.
**/
UINTN
EFIAPI
AsciiStrSize (
IN CONST CHAR8 *String
)
{
return (AsciiStrLen (String) + 1) * sizeof (*String);
}
/**
Compares two Null-terminated ASCII strings, and returns the difference
between the first mismatched ASCII characters.
This function compares the Null-terminated ASCII string FirstString to the
Null-terminated ASCII string SecondString. If FirstString is identical to
SecondString, then 0 is returned. Otherwise, the value returned is the first
mismatched ASCII character in SecondString subtracted from the first
mismatched ASCII character in FirstString.
If FirstString is NULL, then ASSERT().
If SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and SecondString contains more
than PcdMaximumAsciiStringLength ASCII characters, not including the
Null-terminator, then ASSERT().
@param FirstString A pointer to a Null-terminated ASCII string.
@param SecondString A pointer to a Null-terminated ASCII string.
@retval ==0 FirstString is identical to SecondString.
@retval !=0 FirstString is not identical to SecondString.
**/
INTN
EFIAPI
AsciiStrCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString
)
{
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (FirstString));
ASSERT (AsciiStrSize (SecondString));
while ((*FirstString != '\0') && (*FirstString == *SecondString)) {
FirstString++;
SecondString++;
}
return *FirstString - *SecondString;
}
/**
Converts a lowercase Ascii character to upper one.
If Chr is lowercase Ascii character, then converts it to upper one.
If Value >= 0xA0, then ASSERT().
If (Value & 0x0F) >= 0x0A, then ASSERT().
@param Chr one Ascii character
@return The uppercase value of Ascii character
**/
CHAR8
EFIAPI
InternalBaseLibAsciiToUpper (
IN CHAR8 Chr
)
{
return (UINT8) ((Chr >= 'a' && Chr <= 'z') ? Chr - ('a' - 'A') : Chr);
}
/**
Convert a ASCII character to numerical value.
This internal function only deal with Unicode character
which maps to a valid hexadecimal ASII character, i.e.
'0' to '9', 'a' to 'f' or 'A' to 'F'. For other
ASCII character, the value returned does not make sense.
@param Char The character to convert.
@return The numerical value converted.
**/
UINTN
EFIAPI
InternalAsciiHexCharToUintn (
IN CHAR8 Char
)
{
if (InternalIsDecimalDigitCharacter (Char)) {
return Char - '0';
}
return (10 + InternalBaseLibAsciiToUpper (Char) - 'A');
}
/**
Performs a case insensitive comparison of two Null-terminated ASCII strings,
and returns the difference between the first mismatched ASCII characters.
This function performs a case insensitive comparison of the Null-terminated
ASCII string FirstString to the Null-terminated ASCII string SecondString. If
FirstString is identical to SecondString, then 0 is returned. Otherwise, the
value returned is the first mismatched lower case ASCII character in
SecondString subtracted from the first mismatched lower case ASCII character
in FirstString.
If FirstString is NULL, then ASSERT().
If SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and SecondString contains more
than PcdMaximumAsciiStringLength ASCII characters, not including the
Null-terminator, then ASSERT().
@param FirstString A pointer to a Null-terminated ASCII string.
@param SecondString A pointer to a Null-terminated ASCII string.
@retval ==0 FirstString is identical to SecondString using case insensitive
comparisons.
@retval !=0 FirstString is not identical to SecondString using case
insensitive comparisons.
**/
INTN
EFIAPI
AsciiStriCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString
)
{
CHAR8 UpperFirstString;
CHAR8 UpperSecondString;
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (FirstString));
ASSERT (AsciiStrSize (SecondString));
UpperFirstString = InternalBaseLibAsciiToUpper (*FirstString);
UpperSecondString = InternalBaseLibAsciiToUpper (*SecondString);
while ((*FirstString != '\0') && (UpperFirstString == UpperSecondString)) {
FirstString++;
SecondString++;
UpperFirstString = InternalBaseLibAsciiToUpper (*FirstString);
UpperSecondString = InternalBaseLibAsciiToUpper (*SecondString);
}
return UpperFirstString - UpperSecondString;
}
/**
Compares two Null-terminated ASCII strings with maximum lengths, and returns
the difference between the first mismatched ASCII characters.
This function compares the Null-terminated ASCII string FirstString to the
Null-terminated ASCII string SecondString. At most, Length ASCII characters
will be compared. If Length is 0, then 0 is returned. If FirstString is
identical to SecondString, then 0 is returned. Otherwise, the value returned
is the first mismatched ASCII character in SecondString subtracted from the
first mismatched ASCII character in FirstString.
If Length > 0 and FirstString is NULL, then ASSERT().
If Length > 0 and SecondString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Length is greater than
PcdMaximumAsciiStringLength, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and FirstString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and SecondString contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
@param FirstString A pointer to a Null-terminated ASCII string.
@param SecondString A pointer to a Null-terminated ASCII string.
@param Length The maximum number of ASCII characters for compare.
@retval ==0 FirstString is identical to SecondString.
@retval !=0 FirstString is not identical to SecondString.
**/
INTN
EFIAPI
AsciiStrnCmp (
IN CONST CHAR8 *FirstString,
IN CONST CHAR8 *SecondString,
IN UINTN Length
)
{
if (Length == 0) {
return 0;
}
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (FirstString));
ASSERT (AsciiStrSize (SecondString));
if (PcdGet32 (PcdMaximumAsciiStringLength) != 0) {
ASSERT (Length <= PcdGet32 (PcdMaximumAsciiStringLength));
}
while ((*FirstString != '\0') &&
(*SecondString != '\0') &&
(*FirstString == *SecondString) &&
(Length > 1)) {
FirstString++;
SecondString++;
Length--;
}
return *FirstString - *SecondString;
}
#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
/**
[ATTENTION] This function will be deprecated for security reason.
Concatenates one Null-terminated ASCII string to another Null-terminated
ASCII string, and returns the concatenated ASCII string.
This function concatenates two Null-terminated ASCII strings. The contents of
Null-terminated ASCII string Source are concatenated to the end of Null-
terminated ASCII string Destination. The Null-terminated concatenated ASCII
String is returned.
If Destination is NULL, then ASSERT().
If Source is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero and Destination contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and Source contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero and concatenating Destination and
Source results in a ASCII string with more than PcdMaximumAsciiStringLength
ASCII characters, then ASSERT().
@param Destination A pointer to a Null-terminated ASCII string.
@param Source A pointer to a Null-terminated ASCII string.
@return Destination
**/
CHAR8 *
EFIAPI
AsciiStrCat (
IN OUT CHAR8 *Destination,
IN CONST CHAR8 *Source
)
{
AsciiStrCpy (Destination + AsciiStrLen (Destination), Source);
//
// Size of the resulting string should never be zero.
// PcdMaximumUnicodeStringLength is tested inside StrLen().
//
ASSERT (AsciiStrSize (Destination) != 0);
return Destination;
}
/**
[ATTENTION] This function will be deprecated for security reason.
Concatenates up to a specified length one Null-terminated ASCII string to
the end of another Null-terminated ASCII string, and returns the
concatenated ASCII string.
This function concatenates two Null-terminated ASCII strings. The contents
of Null-terminated ASCII string Source are concatenated to the end of Null-
terminated ASCII string Destination, and Destination is returned. At most,
Length ASCII characters are concatenated from Source to the end of
Destination, and Destination is always Null-terminated. If Length is 0, then
Destination is returned unmodified. If Source and Destination overlap, then
the results are undefined.
If Length > 0 and Destination is NULL, then ASSERT().
If Length > 0 and Source is NULL, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Length is greater than
PcdMaximumAsciiStringLength, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Destination contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Source contains more than
PcdMaximumAsciiStringLength ASCII characters, not including the Null-terminator,
then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and concatenating Destination and
Source results in a ASCII string with more than PcdMaximumAsciiStringLength
ASCII characters, not including the Null-terminator, then ASSERT().
@param Destination A pointer to a Null-terminated ASCII string.
@param Source A pointer to a Null-terminated ASCII string.
@param Length The maximum number of ASCII characters to concatenate from
Source.
@return Destination
**/
CHAR8 *
EFIAPI
AsciiStrnCat (
IN OUT CHAR8 *Destination,
IN CONST CHAR8 *Source,
IN UINTN Length
)
{
UINTN DestinationLen;
DestinationLen = AsciiStrLen (Destination);
AsciiStrnCpy (Destination + DestinationLen, Source, Length);
Destination[DestinationLen + Length] = '\0';
//
// Size of the resulting string should never be zero.
// PcdMaximumUnicodeStringLength is tested inside StrLen().
//
ASSERT (AsciiStrSize (Destination) != 0);
return Destination;
}
#endif
/**
Returns the first occurrence of a Null-terminated ASCII sub-string
in a Null-terminated ASCII string.
This function scans the contents of the ASCII string specified by String
and returns the first occurrence of SearchString. If SearchString is not
found in String, then NULL is returned. If the length of SearchString is zero,
then String is returned.
If String is NULL, then ASSERT().
If SearchString is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and SearchString or
String contains more than PcdMaximumAsciiStringLength Unicode characters
not including the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@param SearchString A pointer to a Null-terminated ASCII string to search for.
@retval NULL If the SearchString does not appear in String.
@retval others If there is a match return the first occurrence of SearchingString.
If the length of SearchString is zero,return String.
**/
CHAR8 *
EFIAPI
AsciiStrStr (
IN CONST CHAR8 *String,
IN CONST CHAR8 *SearchString
)
{
CONST CHAR8 *FirstMatch;
CONST CHAR8 *SearchStringTmp;
//
// ASSERT both strings are less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (String) != 0);
ASSERT (AsciiStrSize (SearchString) != 0);
if (*SearchString == '\0') {
return (CHAR8 *) String;
}
while (*String != '\0') {
SearchStringTmp = SearchString;
FirstMatch = String;
while ((*String == *SearchStringTmp)
&& (*String != '\0')) {
String++;
SearchStringTmp++;
}
if (*SearchStringTmp == '\0') {
return (CHAR8 *) FirstMatch;
}
if (*String == '\0') {
return NULL;
}
String = FirstMatch + 1;
}
return NULL;
}
/**
Convert a Null-terminated ASCII decimal string to a value of type
UINTN.
This function returns a value of type UINTN by interpreting the contents
of the ASCII string String as a decimal number. The format of the input
ASCII string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before the digits.
The running zero in the beginning of [decimal digits] will be ignored. Then, the
function stops at the first character that is a not a valid decimal character or
Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits, then 0 is returned.
If the number represented by String overflows according to the range defined by
UINTN, then MAX_UINTN is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINTN
EFIAPI
AsciiStrDecimalToUintn (
IN CONST CHAR8 *String
)
{
UINTN Result;
AsciiStrDecimalToUintnS (String, (CHAR8 **) NULL, &Result);
return Result;
}
/**
Convert a Null-terminated ASCII decimal string to a value of type
UINT64.
This function returns a value of type UINT64 by interpreting the contents
of the ASCII string String as a decimal number. The format of the input
ASCII string String is:
[spaces] [decimal digits].
The valid decimal digit character is in the range [0-9]. The function will
ignore the pad space, which includes spaces or tab characters, before the digits.
The running zero in the beginning of [decimal digits] will be ignored. Then, the
function stops at the first character that is a not a valid decimal character or
Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no pad spaces or valid decimal digits, then 0 is returned.
If the number represented by String overflows according to the range defined by
UINT64, then MAX_UINT64 is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and String contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINT64
EFIAPI
AsciiStrDecimalToUint64 (
IN CONST CHAR8 *String
)
{
UINT64 Result;
AsciiStrDecimalToUint64S (String, (CHAR8 **) NULL, &Result);
return Result;
}
/**
Convert a Null-terminated ASCII hexadecimal string to a value of type UINTN.
This function returns a value of type UINTN by interpreting the contents of
the ASCII string String as a hexadecimal number. The format of the input ASCII
string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
appears in the input string, it must be prefixed with at least one 0. The function
will ignore the pad space, which includes spaces or tab characters, before [zeros],
[x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
digit. Then, the function stops at the first character that is a not a valid
hexadecimal character or Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
0 is returned.
If the number represented by String overflows according to the range defined by UINTN,
then MAX_UINTN is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero,
and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINTN
EFIAPI
AsciiStrHexToUintn (
IN CONST CHAR8 *String
)
{
UINTN Result;
AsciiStrHexToUintnS (String, (CHAR8 **) NULL, &Result);
return Result;
}
/**
Convert a Null-terminated ASCII hexadecimal string to a value of type UINT64.
This function returns a value of type UINT64 by interpreting the contents of
the ASCII string String as a hexadecimal number. The format of the input ASCII
string String is:
[spaces][zeros][x][hexadecimal digits].
The valid hexadecimal digit character is in the range [0-9], [a-f] and [A-F].
The prefix "0x" is optional. Both "x" and "X" is allowed in "0x" prefix. If "x"
appears in the input string, it must be prefixed with at least one 0. The function
will ignore the pad space, which includes spaces or tab characters, before [zeros],
[x] or [hexadecimal digits]. The running zero before [x] or [hexadecimal digits]
will be ignored. Then, the decoding starts after [x] or the first valid hexadecimal
digit. Then, the function stops at the first character that is a not a valid
hexadecimal character or Null-terminator, whichever on comes first.
If String has only pad spaces, then 0 is returned.
If String has no leading pad spaces, leading zeros or valid hexadecimal digits, then
0 is returned.
If the number represented by String overflows according to the range defined by UINT64,
then MAX_UINT64 is returned.
If String is NULL, then ASSERT().
If PcdMaximumAsciiStringLength is not zero,
and String contains more than PcdMaximumAsciiStringLength ASCII characters not including
the Null-terminator, then ASSERT().
@param String A pointer to a Null-terminated ASCII string.
@retval Value translated from String.
**/
UINT64
EFIAPI
AsciiStrHexToUint64 (
IN CONST CHAR8 *String
)
{
UINT64 Result;
AsciiStrHexToUint64S (String, (CHAR8 **) NULL, &Result);
return Result;
}
#ifndef DISABLE_NEW_DEPRECATED_INTERFACES
/**
[ATTENTION] This function is deprecated for security reason.
Convert one Null-terminated ASCII string to a Null-terminated
Unicode string and returns the Unicode string.
This function converts the contents of the ASCII string Source to the Unicode
string Destination, and returns Destination. The function terminates the
Unicode string Destination by appending a Null-terminator character at the end.
The caller is responsible to make sure Destination points to a buffer with size
equal or greater than ((AsciiStrLen (Source) + 1) * sizeof (CHAR16)) in bytes.
If Destination is NULL, then ASSERT().
If Destination is not aligned on a 16-bit boundary, then ASSERT().
If Source is NULL, then ASSERT().
If Source and Destination overlap, then ASSERT().
If PcdMaximumAsciiStringLength is not zero, and Source contains more than
PcdMaximumAsciiStringLength ASCII characters not including the Null-terminator,
then ASSERT().
If PcdMaximumUnicodeStringLength is not zero, and Source contains more than
PcdMaximumUnicodeStringLength ASCII characters not including the
Null-terminator, then ASSERT().
@param Source A pointer to a Null-terminated ASCII string.
@param Destination A pointer to a Null-terminated Unicode string.
@return Destination.
**/
CHAR16 *
EFIAPI
AsciiStrToUnicodeStr (
IN CONST CHAR8 *Source,
OUT CHAR16 *Destination
)
{
CHAR16 *ReturnValue;
ASSERT (Destination != NULL);
//
// ASSERT Source is less long than PcdMaximumAsciiStringLength
//
ASSERT (AsciiStrSize (Source) != 0);
//
// Source and Destination should not overlap
//
ASSERT ((UINTN) ((CHAR8 *) Destination - Source) > AsciiStrLen (Source));
ASSERT ((UINTN) (Source - (CHAR8 *) Destination) >= (AsciiStrSize (Source) * sizeof (CHAR16)));
ReturnValue = Destination;
while (*Source != '\0') {
*(Destination++) = (CHAR16) *(Source++);
}
//
// End the Destination with a NULL.
//
*Destination = '\0';
//
// ASSERT Original Destination is less long than PcdMaximumUnicodeStringLength
//
ASSERT (StrSize (ReturnValue) != 0);
return ReturnValue;
}
#endif
/**
Converts an 8-bit value to an 8-bit BCD value.
Converts the 8-bit value specified by Value to BCD. The BCD value is
returned.
If Value >= 100, then ASSERT().
@param Value The 8-bit value to convert to BCD. Range 0..99.
@return The BCD value.
**/
UINT8
EFIAPI
DecimalToBcd8 (
IN UINT8 Value
)
{
ASSERT (Value < 100);
return (UINT8) (((Value / 10) << 4) | (Value % 10));
}
/**
Converts an 8-bit BCD value to an 8-bit value.
Converts the 8-bit BCD value specified by Value to an 8-bit value. The 8-bit
value is returned.
If Value >= 0xA0, then ASSERT().
If (Value & 0x0F) >= 0x0A, then ASSERT().
@param Value The 8-bit BCD value to convert to an 8-bit value.
@return The 8-bit value is returned.
**/
UINT8
EFIAPI
BcdToDecimal8 (
IN UINT8 Value
)
{
ASSERT (Value < 0xa0);
ASSERT ((Value & 0xf) < 0xa);
return (UINT8) ((Value >> 4) * 10 + (Value & 0xf));
}
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