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[libc] Add strcmp()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -1,7 +1,7 @@

 # See LICENSE file for copyright and license details.

 .POSIX:

-LIBCOBJ = assert.o strcpy.o

+LIBCOBJ = assert.o strcpy.o strcmp.o

 libc.a: $(LIBCOJB)

 	ar $(ARFLAGS) $@ $?

--- /dev/null

+++ b/libc/src/strcmp.c

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

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

+

+#include <string.h>

+

+int

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

+{

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

+		++s1, ++s2;

+	return *s1 - *s2;

+}