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[libc] Add strchr()

--- 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 strcmp.o strlen.o

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

 all: libc.a

--- /dev/null

+++ b/libc/src/strchr.c

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

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

+

+#include <string.h>

+

+char *

+strchr(const char *s, int c)

+{

+	while (*s && *s != c)

+		++s;

+	return (*s) ? (char *) s : NULL;

+}