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std.zig.readSourceFileToEndAlloc: add file size heuristic

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Andrew Kelley 2025-07-16 13:39:42 -07:00
parent 73cfba4d0d
commit 1f93f61958
1 changed files with 5 additions and 0 deletions
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lib/std/zig.zig
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@ -534,6 +534,11 @@ pub fn readSourceFileToEndAlloc(gpa: Allocator, file_reader: *std.fs.File.Reader
var buffer: std.ArrayListAlignedUnmanaged(u8, .@"2") = .empty; var buffer: std.ArrayListAlignedUnmanaged(u8, .@"2") = .empty;
defer buffer.deinit(gpa); defer buffer.deinit(gpa);
if (file_reader.getSize()) |size| {
const casted_size = std.math.cast(u32, size) orelse return error.StreamTooLong;
try buffer.ensureTotalCapacityPrecise(gpa, casted_size);
} else |_| {}
try file_reader.interface.appendRemaining(gpa, .@"2", &buffer, .limited(max_src_size)); try file_reader.interface.appendRemaining(gpa, .@"2", &buffer, .limited(max_src_size));
// Detect unsupported file types with their Byte Order Mark // Detect unsupported file types with their Byte Order Mark