build: wire stdlib sources and tests

Makefile.am

@@ -75,7 +75,14 @@ VLIBC_CORE_SRCS = \
     src/string/strstr.c \
     src/string/strtok.c \
     src/malloc/malloc.c \
-    src/ctype/ctype.c
+    src/ctype/ctype.c \
+    src/stdlib/strtox.c \
+    src/stdlib/strtox_impl.c \
+    src/stdlib/strtod.c \
+    src/stdlib/rand.c \
+    src/stdlib/qsort.c \
+    src/stdlib/div.c \
+    src/stdlib/inttypes.c
 
 # Profile-gated sources, EXISTING gates preserved (strlcpy/strlcat stay L2
 # BSD, strcasestr stays L3 GNU — NOT promoted). Task 8/9 additions: stpcpy.c
@@ -87,7 +94,9 @@ VLIBC_CORE_SRCS = \
 # 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.
+# and self-gate at level 1. Likewise rand.c (its L2 rand_r/drand48 section)
+# and the strtox/strtod/inttypes/div/qsort C files (their L2 gates live in
+# include/stdlib.h / include/inttypes.h declarations) stay in VLIBC_CORE_SRCS.
 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 \
@@ -129,6 +138,7 @@ vlibc_include_HEADERS = \
     include/stdbool.h \
     include/stdckdint.h \
     include/stdint.h \
+    include/inttypes.h \
     include/stdlib.h \
     include/stdnoreturn.h \
     include/tar.h \
@@ -263,7 +273,8 @@ 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_strings
+    test_startup test_malloc test_string test_ctype test_strings \
+    test_strtol test_qsort test_inttypes
 
 test_syscall_SOURCES = tests/syscall_test.c
 test_syscall_CFLAGS = $(VLIBC_TEST_CFLAGS)
@@ -319,13 +330,33 @@ test_strings_DEPENDENCIES = crt1.o libvlibc-check.a
 test_strings_LINK = $(VLIBC_TEST_LINK)
 test_strings_LDADD = $(VLIBC_TEST_LDADD)
 
+test_strtol_SOURCES = tests/test_strtol.c
+test_strtol_CFLAGS = $(VLIBC_TEST_CFLAGS)
+test_strtol_DEPENDENCIES = crt1.o libvlibc-check.a
+test_strtol_LINK = $(VLIBC_TEST_LINK)
+test_strtol_LDADD = $(VLIBC_TEST_LDADD)
+
+test_qsort_SOURCES = tests/test_qsort.c
+test_qsort_CFLAGS = $(VLIBC_TEST_CFLAGS)
+test_qsort_DEPENDENCIES = crt1.o libvlibc-check.a
+test_qsort_LINK = $(VLIBC_TEST_LINK)
+test_qsort_LDADD = $(VLIBC_TEST_LDADD)
+
+test_inttypes_SOURCES = tests/test_inttypes.c
+test_inttypes_CFLAGS = $(VLIBC_TEST_CFLAGS)
+test_inttypes_DEPENDENCIES = crt1.o libvlibc-check.a
+test_inttypes_LINK = $(VLIBC_TEST_LINK)
+test_inttypes_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/
-# 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.
+# test_strings/test_strtol/test_qsort/test_inttypes 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_strings \
+    test_strtol test_qsort test_inttypes \
     tests/startup_modes.sh
 
 CLEANFILES = crt1.o libvlibc-check.a $(VLIBC_CHECK_OBJECTS)
@@ -342,6 +373,7 @@ EXTRA_DIST = \
     src/internal/errno.h \
     src/internal/libc.h \
     src/internal/malloc.h \
+    src/internal/strtox.h \
     src/internal/syscall.h \
     src/internal/types.h \
     src/start/start.h \