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`os_log` truncates trailing whitespace in a log message. If a chunk containing the file contents ends with a newline, this means that the newline will not get logged and thus the file contents read from the log aren't correct. Append an end marker to each chunk to prevent this trimming.
37 lines
1.8 KiB
Swift
37 lines
1.8 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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/// Splits `message` on newline characters such that each chunk is at most `maxChunkSize` bytes long.
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///
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/// The intended use case for this is to split compiler arguments and a file's contents into multiple chunks so
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/// that each chunk doesn't exceed the maximum message length of `os_log` and thus won't get truncated.
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///
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/// - Note: This will only split along newline boundary. If a single line is longer than `maxChunkSize`, it won't be
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/// split. This is fine for compiler argument splitting since a single argument is rarely longer than 800 characters.
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public func splitLongMultilineMessage(message: String, maxChunkSize: Int = 800) -> [String] {
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var chunks: [String] = []
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for line in message.split(separator: "\n", omittingEmptySubsequences: false) {
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if let lastChunk = chunks.last, lastChunk.utf8.count + line.utf8.count < maxChunkSize {
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chunks[chunks.count - 1] += "\n" + line
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} else {
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if !chunks.isEmpty {
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// Append an end marker to the last chunk so that os_log doesn't truncate trailing whitespace,
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// which would modify the source contents.
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// Empty newlines are important so the offset of the request is correct.
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chunks[chunks.count - 1] += "\n--- End Chunk"
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}
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chunks.append(String(line))
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}
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}
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return chunks
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}
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