Separate out the configuration code from initialization

Makefile.in

@@ -131,6 +131,7 @@ C_SRCS := $(srcroot)src/jemalloc.c \
 	$(srcroot)src/large.c \
 	$(srcroot)src/log.c \
 	$(srcroot)src/malloc_io.c \
+	$(srcroot)src/conf.c \
 	$(srcroot)src/mutex.c \
 	$(srcroot)src/nstime.c \
 	$(srcroot)src/pa.c \

include/jemalloc/internal/conf.h

@@ -0,0 +1,27 @@
+#ifndef JEMALLOC_INTERNAL_CONF_H
+#define JEMALLOC_INTERNAL_CONF_H
+
+#include "jemalloc/internal/sc.h"
+
+void malloc_conf_init(sc_data_t *sc_data, unsigned bin_shard_sizes[SC_NBINS],
+    char readlink_buf[PATH_MAX + 1]);
+void malloc_abort_invalid_conf(void);
+
+#ifdef JEMALLOC_JET
+extern bool had_conf_error;
+bool conf_next(char const **opts_p, char const **k_p, size_t *klen_p,
+    char const **v_p, size_t *vlen_p);
+void conf_error(const char *msg, const char *k, size_t klen,
+    const char *v, size_t vlen);
+bool conf_handle_bool(const char *v, size_t vlen, bool *result);
+bool conf_handle_unsigned(const char *v, size_t vlen,
+    uintmax_t min, uintmax_t max, bool check_min, bool check_max,
+    bool clip, uintmax_t *result);
+bool conf_handle_signed(const char *v, size_t vlen,
+    intmax_t min, intmax_t max, bool check_min, bool check_max,
+    bool clip, intmax_t *result);
+bool conf_handle_char_p(const char *v, size_t vlen,
+    char *dest, size_t dest_sz);
+#endif
+
+#endif /* JEMALLOC_INTERNAL_CONF_H */

include/jemalloc/internal/jemalloc_internal_externs.h

@@ -3,6 +3,7 @@
 
 #include "jemalloc/internal/arena_types.h"
 #include "jemalloc/internal/atomic.h"
+#include "jemalloc/internal/fxp.h"
 #include "jemalloc/internal/hpa_opts.h"
 #include "jemalloc/internal/nstime.h"
 #include "jemalloc/internal/sec_opts.h"
@@ -34,6 +35,7 @@ extern bool                  opt_experimental_infallible_new;
 extern bool                  opt_experimental_tcache_gc;
 extern bool                  opt_zero;
 extern unsigned              opt_narenas;
+extern fxp_t                 opt_narenas_ratio;
 extern zero_realloc_action_t opt_zero_realloc_action;
 extern malloc_init_t         malloc_init_state;
 extern const char *const     zero_realloc_mode_names[];