OpenCorePkg/Library/OcStringLib/OcUnicodeLib.c

/** @file
  Copyright (C) 2016, The HermitCrabs Lab. All rights reserved.

  All rights reserved.

  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 <Base.h>

#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/OcStringLib.h>
#include <Library/PcdLib.h>

INTN
EFIAPI
OcStriCmp (
  IN CHAR16  *FirstString,
  IN CHAR16  *SecondString
  )
{
  CHAR16  UpperFirstString;
  CHAR16  UpperSecondString;

  //
  // ASSERT both strings are less long than PcdMaximumUnicodeStringLength
  //
  ASSERT (StrSize (FirstString) != 0);
  ASSERT (StrSize (SecondString) != 0);

  UpperFirstString  = CharToUpper (*FirstString);
  UpperSecondString = CharToUpper (*SecondString);
  while ((*FirstString != '\0') && (*SecondString != '\0') && (UpperFirstString == UpperSecondString)) {
    FirstString++;
    SecondString++;
    UpperFirstString  = CharToUpper (*FirstString);
    UpperSecondString = CharToUpper (*SecondString);
  }

  return UpperFirstString - UpperSecondString;
}

INTN
EFIAPI
OcStrniCmp (
  IN CONST CHAR16  *FirstString,
  IN CONST CHAR16  *SecondString,
  IN UINTN         Length
  )
{
  CHAR16  UpperFirstString;
  CHAR16  UpperSecondString;

  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));
  }

  UpperFirstString  = CharToUpper (*FirstString);
  UpperSecondString = CharToUpper (*SecondString);
  while ((*FirstString != L'\0') &&
         (*SecondString != L'\0') &&
         (UpperFirstString == UpperSecondString) &&
         (Length > 1)) {
    FirstString++;
    SecondString++;
    UpperFirstString  = CharToUpper (*FirstString);
    UpperSecondString = CharToUpper (*SecondString);
    Length--;
  }

  return UpperFirstString - UpperSecondString;
}

CHAR16 *
EFIAPI
OcStriStr (
  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
  )
{
  CHAR16  *Needle;

  while ((Needle = StrStr (String, L"/")) != NULL) {
    *Needle = L'\\';
  }
}

VOID
UnicodeFilterString (
  IN OUT CHAR16   *String,
  IN     BOOLEAN  SingleLine
  )
{
  while (*String != L'\0') {
    if ((*String & 0x7FU) != *String) {
      //
      // Remove all unicode characters.
      //
      *String = L'_';
    } else if (SingleLine && (*String == L'\r' || *String == L'\n')) {
      //
      // Stop after printing one line.
      //
      *String = L'\0';
      break;
    } else if (*String < 0x20 || *String == 0x7F) {
      //
      // Drop all unprintable spaces but space including tabs.
      //
      *String = L'_';
    }

    ++String;
  }
}