build: wire strings.h sources and tests

Makefile.am

@@ -82,12 +82,16 @@ VLIBC_CORE_SRCS = \
 # (stpcpy/stpncpy) and memccpy.c are WHOLE-FILE L2-gated (#if VLIBC_LEVEL_GE(2)
 # around the entire body), and isascii.c/toascii.c hold only L2 symbols
 # (the header gates their declarations) — all four must be omitted from a
-# level-1 profile, so they join the GE_2 conditional list. Files with L1
+# level-1 profile, so they join the GE_2 conditional list. Task 10's
+# strings_impl.c is likewise whole-file L2-gated (strcasecmp/strncasecmp/ffs/
+# ffsl/ffsll/bcmp/bcopy/bzero/index/rindex — nothing is POSIX.1-2008 base), so
+# it also joins the GE_2 conditional list. Files with L1
 # bodies plus small L2 sections (strcoll.c, strdup.c) stay in VLIBC_CORE_SRCS
 # and self-gate at level 1.
 VLIBC_LEVEL2_SRCS = src/string/strlcpy.c src/string/strlcat.c \
     src/string/stpcpy.c src/string/memccpy.c \
-    src/ctype/isascii.c src/ctype/toascii.c
+    src/ctype/isascii.c src/ctype/toascii.c \
+    src/string/strings_impl.c
 VLIBC_LEVEL3_SRCS = src/string/strcasestr.c
 
 vlibc_lib_LTLIBRARIES = libvlibc.la
@@ -109,6 +113,7 @@ vlibc_include_HEADERS = \
     include/vlibc.h \
     include/stddef.h \
     include/string.h \
+    include/strings.h \
     include/errno.h \
     include/setjmp.h \
     include/assert.h \
@@ -258,7 +263,7 @@ VLIBC_TEST_CFLAGS = -DVLIBC_LEVEL=$(VLIBC_TEST_LEVEL) -fno-stack-protector \
     -fno-pic -fno-pie
 
 check_PROGRAMS = test_syscall test_strerror test_setjmp test_headers \
-    test_startup test_malloc test_string test_ctype
+    test_startup test_malloc test_string test_ctype test_strings
 
 test_syscall_SOURCES = tests/syscall_test.c
 test_syscall_CFLAGS = $(VLIBC_TEST_CFLAGS)
@@ -308,13 +313,19 @@ test_ctype_DEPENDENCIES = crt1.o libvlibc-check.a
 test_ctype_LINK = $(VLIBC_TEST_LINK)
 test_ctype_LDADD = $(VLIBC_TEST_LDADD)
 
+test_strings_SOURCES = tests/test_strings.c
+test_strings_CFLAGS = $(VLIBC_TEST_CFLAGS)
+test_strings_DEPENDENCIES = crt1.o libvlibc-check.a
+test_strings_LINK = $(VLIBC_TEST_LINK)
+test_strings_LDADD = $(VLIBC_TEST_LDADD)
+
 # test_startup's default mode exits 42 by design, so it is NOT a bare TESTS
 # entry; tests/startup_modes.sh runs its full mode matrix and the -f failure
-# scenarios of the other binaries. test_malloc/test_string/test_ctype default
-# to the happy mode (exit 0 on all-pass) and are bare TESTS entries; their
-# -f/-p modes stay runnable by hand.
+# scenarios of the other binaries. test_malloc/test_string/test_ctype/
+# test_strings default to the happy mode (exit 0 on all-pass) and are bare
+# TESTS entries; their -f/-p modes stay runnable by hand.
 TESTS = test_syscall test_strerror test_setjmp test_headers \
-    test_malloc test_string test_ctype \
+    test_malloc test_string test_ctype test_strings \
     tests/startup_modes.sh
 
 CLEANFILES = crt1.o libvlibc-check.a $(VLIBC_CHECK_OBJECTS)