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[libc] Add strcoll()

We only support C locale, so strcoll() is equivalent to strcmp()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -2,7 +2,7 @@

 .POSIX:

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

-          strrchr.o strcat.o strncpy.o strncat.o \

+          strrchr.o strcat.o strncpy.o strncat.o strcoll.o \

           memset.o memcpy.o memmove.o memcmp.o memchr.o

 all: libc.a

--- /dev/null

+++ b/libc/src/strcoll.c

@@ -1,0 +1,11 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <string.h>

+

+int

+strcoll(const char *s1, const char *s2)

+{

+	while (*s1 && *s2 && *s1 != *s2)

+		++s1, ++s2;

+	return *s1 - *s2;

+}