62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
// Copyright 2010-2025 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Architecture-neutral plug compatible replacements for strtol() friends.
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//
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// Long's have different lengths on ILP-32 and LP-64 platforms, and so overflow
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// behavior across the two varies when strtol() and similar are used to parse
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// 32-bit integers. Similar problems exist with atoi(), because although it
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// has an all-integer interface, it uses strtol() internally, and so suffers
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// from the same narrowing problems on assignments to int.
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//
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// Examples:
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// errno = 0;
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// i = strtol("3147483647", nullptr, 10);
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// printf("%d, errno %d\n", i, errno);
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// // 32-bit platform: 2147483647, errno 34
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// // 64-bit platform: -1147483649, errno 0
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//
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// printf("%d\n", atoi("3147483647"));
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// // 32-bit platform: 2147483647
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// // 64-bit platform: -1147483649
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//
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// A way round this is to define local replacements for these, and use them
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// instead of the standard libc functions.
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//
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// In most 32-bit cases the replacements can be inlined away to a call to the
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// libc function. In a couple of 64-bit cases, however, adapters are required,
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// to provide the right overflow and errno behavior.
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//
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#ifndef ORTOOLS_BASE_STRTOINT_H_
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#define ORTOOLS_BASE_STRTOINT_H_
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#include <cstdint>
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#include <string>
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#include "absl/base/port.h" // disable some warnings on Windows
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#include "absl/strings/string_view.h"
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namespace operations_research {
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int32_t strtoint32(absl::string_view word);
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int64_t strtoint64(absl::string_view word);
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// Convenience versions of the above that take a string argument.
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inline int32_t atoi32(absl::string_view word) { return strtoint32(word); }
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inline int64_t atoi64(absl::string_view word) { return strtoint64(word); }
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} // namespace operations_research
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#endif // ORTOOLS_BASE_STRTOINT_H_
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