StringFunctions.cpp

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/*
 * Copyright 2022 HEAVY.AI, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <cstdint>
#include "../Shared/funcannotations.h"

#ifdef EXECUTE_INCLUDE

extern "C" RUNTIME_EXPORT NEVER_INLINE DEVICE int32_t
char_length_encoded(const char* str, const int32_t str_len) {  // assumes utf8
  int32_t i = 0, char_count = 0;
  while (i < str_len) {
    const unsigned char ch_masked = str[i] & 0xc0;
    if (ch_masked != 0x80) {
      char_count++;
    }
    i++;
  }
  return char_count;
}

extern "C" RUNTIME_EXPORT NEVER_INLINE DEVICE int32_t
char_length_encoded_nullable(const char* str,
                             const int32_t str_len,
                             const int32_t int_null) {  // assumes utf8
  if (!str) {
    return int_null;
  }
  return char_length_encoded(str, str_len);
}

#endif  // EXECUTE_INCLUDE