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526ee96f49
go/src/os
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Josh Bleecher Snyder 526ee96f49 os: avoid allocation in File.WriteString 
Instead of alloc+copy to convert the string
to a byte slice, do an unsafe conversion.

Rely on the kernel not to scribble on the
buffer during the write.

Fixes #42406

Change-Id: I66f4838b43a11bcc3d67bbfa1706726318d55343
Reviewed-on: https://go-review.googlesource.com/c/go/+/268020
Trust: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
2021-02-25 19:42:00 +00:00
..
exec all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
signal all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
testdata testing/fstest,os: clarify racy behavior of TestFS 2021-01-08 16:34:00 +00:00
user all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
dir_darwin.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dir_plan9.go os: use keyed literals for PathError 2020-10-20 00:59:22 +00:00
dir_unix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
dir_windows.go os: use keyed literals for PathError 2020-10-20 00:59:22 +00:00
dir.go os: add ReadFile, WriteFile, CreateTemp (was TempFile), MkdirTemp (was TempDir) from io/ioutil 2020-12-02 17:00:06 +00:00
dirent_aix.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dirent_dragonfly.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dirent_freebsd.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dirent_js.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dirent_linux.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dirent_netbsd.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dirent_openbsd.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
dirent_solaris.go os: add File.ReadDir method and DirEntry type 2020-10-20 00:59:20 +00:00
endian_big.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
endian_little.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
env_test.go
env_unix_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
env.go
error_errno.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
error_plan9.go
error_posix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
error_test.go all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp 2020-12-09 19:12:23 +00:00
error_unix_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
error_windows_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
error.go os: clarify that IsExist and friends do not use errors.Is 2020-11-11 20:26:44 +00:00
example_test.go os: add ReadFile, WriteFile, CreateTemp (was TempFile), MkdirTemp (was TempDir) from io/ioutil 2020-12-02 17:00:06 +00:00
exec_plan9.go os: export ErrProcessDone variable in windows and plan9 2020-11-03 00:56:12 +00:00
exec_posix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
exec_unix_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
exec_unix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
exec_windows.go os: export ErrProcessDone variable in windows and plan9 2020-11-03 00:56:12 +00:00
exec.go os: export ErrProcessDone variable in windows and plan9 2020-11-03 00:56:12 +00:00
executable_darwin.go
executable_dragonfly.go os: gofmt 2020-11-12 10:22:50 +00:00
executable_freebsd.go os: gofmt 2020-11-12 10:22:50 +00:00
executable_path.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
executable_plan9.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
executable_procfs.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
executable_solaris.go
executable_sysctl.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
executable_test.go
executable_windows.go
executable.go
export_linux_test.go
export_test.go os: add ReadFile, WriteFile, CreateTemp (was TempFile), MkdirTemp (was TempDir) from io/ioutil 2020-12-02 17:00:06 +00:00
export_unix_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
export_windows_test.go
fifo_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
file_plan9.go os: remove dependency on strings package 2020-12-18 18:25:14 +00:00
file_posix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
file_unix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
file_windows.go os: use keyed literals for PathError 2020-10-20 00:59:22 +00:00
file.go os: avoid allocation in File.WriteString 2021-02-25 19:42:00 +00:00
getwd.go os: remove ENOTSUP special case in Getwd on darwin 2020-09-28 06:28:02 +00:00
os_test.go os: avoid allocation in File.WriteString 2021-02-25 19:42:00 +00:00
os_unix_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
os_windows_test.go os: do not close syscall.Stdin in TestReadStdin 2021-01-18 17:21:53 +00:00
path_plan9.go
path_test.go all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp 2020-12-09 19:12:23 +00:00
path_unix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
path_windows_test.go all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp 2020-12-09 19:12:23 +00:00
path_windows.go
path.go os: use keyed literals for PathError 2020-10-20 00:59:22 +00:00
pipe2_bsd.go syscall, os: use pipe2 syscall on DragonflyBSD instead of pipe 2021-02-25 09:20:03 +00:00
pipe2_illumos.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
pipe_bsd.go syscall, os: use pipe2 syscall on DragonflyBSD instead of pipe 2021-02-25 09:20:03 +00:00
pipe_linux.go
pipe_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
proc.go
rawconn_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
rawconn.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
read_test.go os: add ReadFile, WriteFile, CreateTemp (was TempFile), MkdirTemp (was TempDir) from io/ioutil 2020-12-02 17:00:06 +00:00
readfrom_linux_test.go docs: fix spelling 2021-02-24 04:11:43 +00:00
readfrom_linux.go
readfrom_stub.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
removeall_at.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
removeall_noat.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
removeall_test.go all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp 2020-12-09 19:12:23 +00:00
stat_aix.go
stat_darwin.go
stat_dragonfly.go
stat_freebsd.go
stat_js.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
stat_linux.go
stat_netbsd.go
stat_openbsd.go
stat_plan9.go os: use keyed literals for PathError 2020-10-20 00:59:22 +00:00
stat_solaris.go
stat_test.go all: update to use os.ReadFile, os.WriteFile, os.CreateTemp, os.MkdirTemp 2020-12-09 19:12:23 +00:00
stat_unix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
stat_windows.go os: use keyed literals for PathError 2020-10-20 00:59:22 +00:00
stat.go
sticky_bsd.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
sticky_notbsd.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
str.go os: report Windows exit status in hex 2021-02-19 00:01:17 +00:00
sys_aix.go
sys_bsd.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
sys_js.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
sys_linux.go
sys_plan9.go
sys_solaris.go
sys_unix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
sys_windows.go
sys.go
tempfile_test.go os: add ReadFile, WriteFile, CreateTemp (was TempFile), MkdirTemp (was TempDir) from io/ioutil 2020-12-02 17:00:06 +00:00
tempfile.go os: correct names in CreateTemp and MkdirTemp doc comments 2021-01-26 00:02:49 +00:00
timeout_test.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
types_plan9.go
types_unix.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
types_windows.go os: use keyed literals for PathError 2020-10-20 00:59:22 +00:00
types.go io/fs: move FileInfo, FileMode, PathError, ErrInvalid, ... from os to io/fs 2020-10-20 02:32:41 +00:00
wait_unimp.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
wait_wait6.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00
wait_waitid.go all: go fmt std cmd (but revert vendor) 2021-02-20 03:54:50 +00:00