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std.log.defaultLog: provide a small buffer

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This commit is contained in:
Andrew Kelley
2025-07-10 12:41:26 -07:00
parent 5360968e03
commit bd5745ddf2
1 changed files with 8 additions and 11 deletions
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19
lib/std/log.zig
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@@ -137,8 +137,11 @@ pub fn defaultLogEnabled(comptime message_level: Level) bool {
return comptime logEnabled(message_level, default_log_scope); return comptime logEnabled(message_level, default_log_scope);
} }
/// The default implementation for the log function, custom log functions may /// The default implementation for the log function. Custom log functions may
/// forward log messages to this function. /// forward log messages to this function.
///
/// Uses a 64-byte buffer for formatted printing which is flushed before this
/// function returns.
pub fn defaultLog( pub fn defaultLog(
comptime message_level: Level, comptime message_level: Level,
comptime scope: @Type(.enum_literal), comptime scope: @Type(.enum_literal),
@@ -147,16 +150,10 @@ pub fn defaultLog(
) void { ) void {
const level_txt = comptime message_level.asText(); const level_txt = comptime message_level.asText();
const prefix2 = if (scope == .default) ": " else "(" ++ @tagName(scope) ++ "): "; const prefix2 = if (scope == .default) ": " else "(" ++ @tagName(scope) ++ "): ";
const stderr = std.fs.File.stderr().deprecatedWriter(); var buffer: [64]u8 = undefined;
var bw = std.io.bufferedWriter(stderr); const stderr = std.debug.lockStderrWriter(&buffer);
const writer = bw.writer(); defer std.debug.unlockStderrWriter();
nosuspend stderr.print(level_txt ++ prefix2 ++ format ++ "\n", args) catch return;
std.debug.lockStdErr();
defer std.debug.unlockStdErr();
nosuspend {
writer.print(level_txt ++ prefix2 ++ format ++ "\n", args) catch return;
bw.flush() catch return;
}
} }
/// Returns a scoped logging namespace that logs all messages using the scope /// Returns a scoped logging namespace that logs all messages using the scope