sh: Apply locale vars on builtins, recognize LC_MESSAGES as a locale var.

This allows doing things like LC_ALL=C some_builtin to run a builtin under a
different locale, just like is possible with external programs. The
immediate reason is that this allows making printf(1) a builtin without
breaking things like LC_NUMERIC=C printf '%f\n' 1.2

This change also affects special builtins, as even though the assignment is
persistent, the export is only to the builtin (unless the variable was
already exported).

Note: for this to work for builtins that also exist as external programs
such as /bin/test, the setlocale() call must be under #ifndef SHELL. The
shell will do the setlocale() calls which may not agree with the environment
variables.

1 files changed, 4 insertions, 0 deletions

diff --git a/bin/sh/eval.c b/bin/sh/eval.c
index e93fb14..c4495d0 100644
--- a/bin/sh/eval.c
+++ b/bin/sh/eval.c
@@ -937,6 +937,8 @@ evalcommand(union node *cmd, int flags, struct backcmd *backcmd)
 			cmdentry.special = 1;
 		if (cmdentry.special)
 			listsetvar(cmdenviron);
+		if (argc > 0)
+			bltinsetlocale();
 		commandname = argv[0];
 		argptr = argv + 1;
 		nextopt_optptr = NULL;		/* initialize nextopt */
@@ -944,6 +946,8 @@ evalcommand(union node *cmd, int flags, struct backcmd *backcmd)
 		exitstatus = (*builtinfunc[cmdentry.u.index])(argc, argv);
 		flushall();
 cmddone:
+		if (argc > 0)
+			bltinunsetlocale();
 		cmdenviron = NULL;
 		out1 = &output;
 		out2 = &errout;