common: Added possibility to do dlsym() lookups as optional via eGetSym_optional()

Will be used by the authentication plug-in framework.

Signed-off-by: David Sommerseth <dazo@users.sourceforge.net>

2 files changed, 22 insertions, 5 deletions

diff --git a/common/eurephia_getsym.c b/common/eurephia_getsym.c
index 1b9a63e..9460c3a 100644
--- a/common/eurephia_getsym.c
+++ b/common/eurephia_getsym.c
@@ -43,20 +43,36 @@
  *
  * @return Returns a pointer to the function if it was found, otherwise NULL is returned.
  */
-void *eGetSym(eurephiaCTX *ctx, void *dlh, const char *symnam)
+void *eGetSym_optional(eurephiaCTX *ctx, void *dlh, const char *symnam)
 {
-        void *func = NULL;
-
         if( ctx->fatal_error > 0 ) {
                 return NULL;
         }
 
         DEBUG(ctx, 30, "Locating driver function '%s'", symnam);
-        func = dlsym(dlh, symnam);
+        return dlsym(dlh, symnam);
+}
+
+
+/**
+ * Similar to @eGetSym_optional(), but will trigger a panic error if symnam isn't found.
+ *
+ * @param ctx    eurephiaCTX
+ * @param dlh    Handler which dlopen() returned
+ * @param symnam Name of the function to find
+ *
+ * @return Returns a pointer to the function if it was found, otherwise NULL is returned.
+ */
+void *eGetSym(eurephiaCTX *ctx, void *dlh, const char *symnam) {
+        void *func = NULL;
+
+        if( ctx->fatal_error > 0 ) {
+                return NULL;
+        }
+        func = eGetSym_optional(ctx, dlh, symnam);
         if( func == NULL ) {
                 eurephia_log(ctx, LOG_PANIC, 0, "Could not find needed '%s' function in driver", symnam);
                 ctx->fatal_error = 1;
         }
         return func;
 }
-
diff --git a/common/eurephia_getsym.h b/common/eurephia_getsym.h
index 8ca4bc3..73c8aa0 100644
--- a/common/eurephia_getsym.h
+++ b/common/eurephia_getsym.h
@@ -31,6 +31,7 @@
 #ifndef   	EUREPHIA_GETSYM_H_
 #define   	EUREPHIA_GETSYM_H_
 
+void *eGetSym_optional(eurephiaCTX *ctx, void *dlh, const char *symnam);
 void *eGetSym(eurephiaCTX *ctx, void *dlh, const char *symnam);
 
 #endif 	    /* !EUREPHIA_GETSYM_H_ */