sh: Add printf builtin.

This was removed in 2001 but I think it is appropriate to add it back:
* I do not want to encourage people to write fragile and non-portable echo
  commands by making printf much slower than echo.
* Recent versions of Autoconf use it a lot.
* Almost no software still wants to support systems that do not have
  printf(1) at all.
* In many other shells printf is already a builtin.

Side effect: printf is now always the builtin version (which behaves
identically to /usr/bin/printf) and cannot be overridden via PATH (except
via the undocumented %builtin mechanism).

Code size increases about 5K on i386. Embedded folks might want to replace
/usr/bin/printf with a hard link to /usr/bin/alias.

1 files changed, 4 insertions, 1 deletions

diff --git a/share/man/man1/builtin.1 b/share/man/man1/builtin.1
index cbfc873..5a6b5ae 100644
--- a/share/man/man1/builtin.1
+++ b/share/man/man1/builtin.1
@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 9, 2010
+.Dd November 19, 2010
 .Dt BUILTIN 1
 .Os
 .Sh NAME
@@ -99,6 +99,7 @@
 .Nm onintr ,
 .Nm popd ,
 .Nm printenv ,
+.Nm printf ,
 .Nm pushd ,
 .Nm pwd ,
 .Nm read ,
@@ -263,6 +264,7 @@ but are implemented as scripts using a builtin command of the same name.
 .It Ic onintr Ta \&No Ta Yes Ta \&No
 .It Ic popd Ta \&No Ta Yes Ta \&No
 .It Ic printenv Ta Yes Ta Yes Ta \&No
+.It Ic printf Ta Yes Ta \&No Ta Yes
 .It Ic pushd Ta \&No Ta Yes Ta \&No
 .It Ic pwd Ta Yes Ta \&No Ta Yes
 .It Ic read Ta No** Ta \&No Ta Yes
@@ -313,6 +315,7 @@ but are implemented as scripts using a builtin command of the same name.
 .Xr nice 1 ,
 .Xr nohup 1 ,
 .Xr printenv 1 ,
+.Xr printf 1 ,
 .Xr pwd 1 ,
 .Xr sh 1 ,
 .Xr test 1 ,