zig

commit 155ab56cc63d775cca77d7bedbcac6ee65558818 (tree)
parent 5784500572e3d12b0342cc5b09210c1d1f49edc5
Author: Andrew Kelley <andrew@ziglang.org>
Date:   Thu, 17 Jul 2025 09:33:25 -0700

std.zig.readSourceFileToEndAlloc: avoid resizing

+1 on the ensure total capacity to account for the fact that we add a
null byte before returning.

thanks matklad

Diffstat:
M
lib/std/zig.zig
 | 
3
++-

1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/std/zig.zig b/lib/std/zig.zig
@@ -536,7 +536,8 @@ pub fn readSourceFileToEndAlloc(gpa: Allocator, file_reader: *std.fs.File.Reader
 
     if (file_reader.getSize()) |size| {
         const casted_size = std.math.cast(u32, size) orelse return error.StreamTooLong;
-        try buffer.ensureTotalCapacityPrecise(gpa, casted_size);
+        // +1 to avoid resizing for the null byte added in toOwnedSliceSentinel below.
+        try buffer.ensureTotalCapacityPrecise(gpa, casted_size + 1);
     } else |_| {}
 
     try file_reader.interface.appendRemaining(gpa, .@"2", &buffer, .limited(max_src_size));