base: Make log facility opaque, ref-counted

lib/base/heimbase.h

@@ -93,19 +93,7 @@ typedef void (HEIM_CALLCONV *heim_log_log_func_t)(heim_context,
                                                   void *);
 typedef void (HEIM_CALLCONV *heim_log_close_func_t)(void *);
 
-struct heim_log_facility_internal {
+typedef struct heim_log_facility_s heim_log_facility;
-    int min;
-    int max;
-    heim_log_log_func_t log_func;
-    heim_log_close_func_t close_func;
-    void *data;
-};
-
-typedef struct heim_log_facility_s {
-    char *program;
-    int len;
-    struct heim_log_facility_internal *val;
-} heim_log_facility;
 
 typedef uintptr_t
 (HEIM_LIB_CALL *heim_get_instance_func_t)(const char *);

lib/base/log.c

@@ -41,6 +41,21 @@
 #include <stdarg.h>
 #include <vis.h>
 
+struct heim_log_facility_internal {
+    int min;
+    int max;
+    heim_log_log_func_t log_func;
+    heim_log_close_func_t close_func;
+    void *data;
+};
+
+struct heim_log_facility_s {
+    char *program;
+    size_t refs;
+    size_t len;
+    struct heim_log_facility_internal *val;
+};
+
 typedef struct heim_pcontext_s *heim_pcontext;
 typedef struct heim_pconfig *heim_pconfig;
 struct heim_svc_req_desc_common_s {
@@ -126,6 +141,7 @@ heim_initlog(heim_context context,
     heim_log_facility *f = calloc(1, sizeof(*f));
     if (f == NULL)
         return heim_enomem(context);
+    f->refs = 1;
     f->program = strdup(program);
     if (f->program == NULL) {
         free(f);
@@ -135,6 +151,14 @@ heim_initlog(heim_context context,
     return 0;
 }
 
+heim_log_facility *
+heim_log_ref(heim_log_facility *fac)
+{
+    if (fac)
+        fac->refs++;
+    return fac;
+}
+
 heim_error_code
 heim_addlog_func(heim_context context,
                  heim_log_facility *fac,
@@ -432,7 +456,7 @@ heim_closelog(heim_context context, heim_log_facility *fac)
 {
     int i;
 
-    if (!fac)
+    if (!fac || --(fac->refs))
         return;
     for (i = 0; i < fac->len; i++)
         (*fac->val[i].close_func)(fac->val[i].data);