[glibc] support: Add xsetlocale function

[Arjun Shankar <arjun at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cce35a50c1de0cec5cd1f6c18979ff6ee3ea1dd1

commit cce35a50c1de0cec5cd1f6c18979ff6ee3ea1dd1
Author: Arjun Shankar <arjun@redhat.com>
Date:   Mon Nov 11 14:57:23 2019 +0100

    support: Add xsetlocale function

Diff:
---
 support/Makefile     |  1 +
 support/support.h    |  1 +
 support/xsetlocale.c | 30 ++++++++++++++++++++++++++++++
 3 files changed, 32 insertions(+)

diff --git a/support/Makefile b/support/Makefile
index a6081bb..23c6d74 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -154,6 +154,7 @@ libsupport-routines = \
   xrealloc \
   xrecvfrom \
   xsendto \
+  xsetlocale \
   xsetsockopt \
   xsigaction \
   xsignal \
diff --git a/support/support.h b/support/support.h
index a9df6e9..c102344 100644
--- a/support/support.h
+++ b/support/support.h
@@ -91,6 +91,7 @@ char *xasprintf (const char *format, ...)
   __attribute__ ((format (printf, 1, 2), malloc));
 char *xstrdup (const char *);
 char *xstrndup (const char *, size_t);
+char *xsetlocale (int category, const char *locale);
 
 /* These point to the TOP of the source/build tree, not your (or
    support's) subdirectory.  */
diff --git a/support/xsetlocale.c b/support/xsetlocale.c
new file mode 100644
index 0000000..063ed4b
--- /dev/null
+++ b/support/xsetlocale.c
@@ -0,0 +1,30 @@
+/* setlocale with error checking.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <support/check.h>
+
+#include <locale.h>
+
+char *
+xsetlocale (int category, const char *locale)
+{
+  char *p = setlocale (category, locale);
+  if (p == NULL)
+    FAIL_EXIT1 ("error: setlocale (%d, \"%s\")\n", category, locale);
+  return p;
+}