chore: import upstream snapshot with attribution

paddle/utils/string/string_helper.cc

@@ -0,0 +1,87 @@
+// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
+//
+// 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 "paddle/utils/string/string_helper.h"
+
+#include <cctype>
+#include <cstdio>
+
+#include <cstring>
+#include <string>
+
+namespace paddle::string {
+
+// remove leading and tailing spaces
+std::string trim_spaces(const std::string& str) {
+  const char* p = str.c_str();
+
+  while (*p != 0 && isspace(*p)) {
+    p++;
+  }
+
+  size_t len = strlen(p);
+
+  while (len > 0 && isspace(p[len - 1])) {
+    len--;
+  }
+
+  return std::string(p, len);
+}
+
+std::string erase_spaces(const std::string& str) {
+  std::string result;
+  result.reserve(str.size());
+  const char* p = str.c_str();
+  while (*p != 0) {
+    if (!isspace(*p)) {
+      result.append(p, 1);
+    }
+    ++p;
+  }
+  return result;
+}
+
+bool ends_with(std::string const& input, std::string const& test) {
+  if (test.size() > input.size()) return false;
+  return std::equal(test.rbegin(), test.rend(), input.rbegin());
+}
+
+// A helper class for reading lines from file.
+// A line buffer is maintained. It
+// doesn't need to know the maximum possible length of a line.
+char* LineFileReader::getdelim(FILE* f, char delim) {
+#ifndef _WIN32
+  int32_t ret =
+      static_cast<int32_t>(::getdelim(&_buffer, &_buf_size, delim, f));
+
+  if (ret >= 0) {
+    if (ret >= 1 && _buffer[ret - 1] == delim) {
+      _buffer[--ret] = 0;
+    }
+
+    _length = static_cast<size_t>(ret);
+    return _buffer;
+  } else {
+    _length = 0;
+    int code = feof(f);
+    (void)code;
+    assert(code);
+    return nullptr;
+  }
+#else
+  return NULL;
+#endif
+}
+
+}  // namespace paddle::string