11.1/libc-c-locale.diff

Add support of C.<encoding> LANG variable in C library, such as C.UTF-8.
Backported from FreeBSD base r340144.

diff -ru --exclude-from freebsd-src-diff-exclude-names /usr/src/lib/libc/locale/collate.c freebsd-11.1/usr/src/lib/libc/locale/collate.c
--- /usr/src/lib/libc/locale/collate.c	2017-07-21 07:41:40.000000000 +0800
+++ freebsd-11.1/usr/src/lib/libc/locale/collate.c	2019-03-22 16:46:30.464970000 +0800
@@ -82,7 +82,8 @@
 void *
 __collate_load(const char *encoding, __unused locale_t unused)
 {
-	if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
+	if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0 ||
+	    strncmp(encoding, "C.", 2) == 0) {
 		return &__xlocale_C_collate;
 	}
 	struct xlocale_collate *table = calloc(sizeof(struct xlocale_collate), 1);
diff -ru --exclude-from freebsd-src-diff-exclude-names /usr/src/lib/libc/locale/ldpart.c freebsd-11.1/usr/src/lib/libc/locale/ldpart.c
--- /usr/src/lib/libc/locale/ldpart.c	2017-07-21 07:41:40.000000000 +0800
+++ freebsd-11.1/usr/src/lib/libc/locale/ldpart.c	2019-03-22 16:46:30.465950000 +0800
@@ -61,7 +61,8 @@
 	size_t		namesize, bufsize;
 
 	/* 'name' must be already checked. */
-	if (strcmp(name, "C") == 0 || strcmp(name, "POSIX") == 0) {
+	if (strcmp(name, "C") == 0 || strcmp(name, "POSIX") == 0 ||
+	    strncmp(name, "C.", 2) == 0) {
 		*using_locale = 0;
 		return (_LDP_CACHE);
 	}