string_view_util.cc

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// SPDX-License-Identifier: Apache-2.0
// Copyright Apache Software Foundation 2019
 
#include "swoc/string_view_util.h"
 
int
memcmp(std::string_view const &lhs, std::string_view const &rhs) {
  int zret = 0;
  size_t n = rhs.size();
 
  // Seems a bit ugly but size comparisons must be done anyway to get the memcmp args.
  if (lhs.size() < rhs.size()) {
    zret = 1;
    n    = lhs.size();
  } else if (lhs.size() > rhs.size()) {
    zret = -1;
  } else if (lhs.data() == rhs.data()) { // same memory, obviously equal.
    return 0;
  }
 
  int r = ::memcmp(lhs.data(), rhs.data(), n);
  return r ? r : zret;
}
 
int
strcasecmp(const std::string_view &lhs, const std::string_view &rhs) {
  int zret = 0;
  size_t n = rhs.size();
 
  // Seems a bit ugly but size comparisons must be done anyway to get the @c strncasecmp args.
  if (lhs.size() < rhs.size()) {
    zret = 1;
    n    = lhs.size();
  } else if (lhs.size() > rhs.size()) {
    zret = -1;
  } else if (lhs.data() == rhs.data()) { // the same memory, obviously equal.
    return 0;
  }
 
  int r = ::strncasecmp(lhs.data(), rhs.data(), n);
 
  return r ? r : zret;
}