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OcStringLib: Add StriStr function

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This commit is contained in:
vit9696 2020-01-23 19:46:12 +03:00
parent 4011e7915b
commit c7d7cb8068
2 changed files with 77 additions and 67 deletions
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32
Include/Library/OcStringLib.h
View File

@ -172,6 +172,38 @@ StrniCmp (
IN UINTN Length
);
/**
Returns the first occurrence of a Null-terminated Unicode sub-string
in a Null-terminated Unicode string through a case insensitive comparison.
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 The pointer to a Null-terminated Unicode string.
@param SearchString The 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
StriStr (
IN CONST CHAR16 *String,
IN CONST CHAR16 *SearchString
);
/**
Convert path with mixed slashes to UEFI slashes (\\).

112
Library/OcStringLib/OcUnicodeLib.c
View File

@ -19,35 +19,6 @@
#include <Library/OcStringLib.h>
#include <Library/PcdLib.h>
/**
Performs a case insensitive comparison of two Null-terminated Unicode strings,
and returns the difference between the first mismatched Unicode characters.
This function performs a case insensitive comparison of 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 upper case
Unicode character in SecondString subtracted from the first mismatched upper
case Unicode character in FirstString.
If FirstString is NULL, then ASSERT().
If SecondString is NULL, 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 using case
insensitiv comparisons.
@retval !=0 FirstString is not identical to SecondString using case
insensitive comparisons.
**/
INTN
EFIAPI
StriCmp (
@ -76,44 +47,6 @@ StriCmp (
return UpperFirstString - UpperSecondString;
}
/**
Compares up to a specified length the contents of two Null-terminated Unicode
strings using case insensitive comparisons, 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 using case insensitive
comparisons. 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 upper case
Unicode character in SecondString subtracted from the first mismatched upper
case 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 using case
insensitive comparisons.
@retval others FirstString is not identical to SecondString using case
insensitive comparisons.
**/
INTN
EFIAPI
StrniCmp (
@ -156,6 +89,51 @@ StrniCmp (
return UpperFirstString - UpperSecondString;
}
CHAR16 *
EFIAPI
StriStr (
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 ((CharToUpper (*String) == CharToUpper (*SearchStringTmp))
&& (*String != L'\0')) {
String++;
SearchStringTmp++;
}
if (*SearchStringTmp == L'\0') {
return (CHAR16 *) FirstMatch;
}
if (*String == L'\0') {
return NULL;
}
String = FirstMatch + 1;
}
return NULL;
}
VOID
UnicodeUefiSlashes (
IN OUT CHAR16 *String