text: /*
   *
   * Copyright 2015 gRPC authors.
   *
   * 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 "src/core/lib/slice/slice_string_helpers.h"
  
  #include <string.h>
  
  #include <grpc/support/log.h>
  
  #include "src/core/lib/gpr/string.h"
  #include "src/core/lib/slice/slice_internal.h"
  
  char* grpc_dump_slice(grpc_slice s, uint32_t flags) {
    return gpr_dump((const char*)GRPC_SLICE_START_PTR(s), GRPC_SLICE_LENGTH(s),
                    flags);
  }
  
  /** Finds the initial (\a begin) and final (\a end) offsets of the next
   * substring from \a str + \a read_offset until the next \a sep or the end of \a
   * str.
   *
   * Returns 1 and updates \a begin and \a end. Returns 0 otherwise. */
  static int slice_find_separator_offset(const grpc_slice str, const char* sep,
                                         const size_t read_offset, size_t* begin,
                                         size_t* end) {
    size_t i;
    const uint8_t* str_ptr = GRPC_SLICE_START_PTR(str) + read_offset;
    const size_t str_len = GRPC_SLICE_LENGTH(str) - read_offset;
    const size_t sep_len = strlen(sep);
    if (str_len < sep_len) {
      return 0;
    }
  
    for (i = 0; i <= str_len - sep_len; i++) {
      if (memcmp(str_ptr + i, sep, sep_len) == 0) {
        *begin = read_offset;
        *end = read_offset + i;
        return 1;
      }
    }
    return 0;
  }
  
  void grpc_slice_split(grpc_slice str, const char* sep, grpc_slice_buffer* dst) {
    const size_t sep_len = strlen(sep);
    size_t begin, end;
  
    GPR_ASSERT(sep_len > 0);
  
    if (slice_find_separator_offset(str, sep, 0, &begin, &end) != 0) {
      do {
        grpc_slice_buffer_add_indexed(dst, grpc_slice_sub(str, begin, end));
      } while (slice_find_separator_offset(str, sep, end + sep_len, &begin,
                                           &end) != 0);
      grpc_slice_buffer_add_indexed(
          dst, grpc_slice_sub(str, end + sep_len, GRPC_SLICE_LENGTH(str)));
    } else { /* no sep found, add whole input */
      grpc_slice_buffer_add_indexed(dst, grpc_slice_ref_internal(str));
    }
  }
  
  bool grpc_parse_slice_to_uint32(grpc_slice str, uint32_t* result) {
    return gpr_parse_bytes_to_uint32((const char*)GRPC_SLICE_START_PTR(str),
                                     GRPC_SLICE_LENGTH(str), result) != 0;
  }
  