diff --git a/darshan-runtime/lib/darshan-stdio.c b/darshan-runtime/lib/darshan-stdio.c
index 916198e14..e3c959ccf 100644
--- a/darshan-runtime/lib/darshan-stdio.c
+++ b/darshan-runtime/lib/darshan-stdio.c
@@ -215,6 +215,10 @@ extern int __real_fileno(FILE *stream);
     STDIO_UNLOCK(); \
 } while(0)
 
+/* 'darshan_clean_file_path' normally returns a newly allocated string, but it
+ * might return NULL if __path is a special case (e.g. '<STDIN>').  If we see
+ * that case, we'll make a copy of __path.  Now we don't need any special
+ * checks and _newpath can always bedeallocated in cleanup  */
 #define STDIO_RECORD_OPEN(__ret, __path, __tm1, __tm2) do { \
     darshan_record_id __rec_id; \
     struct stdio_file_record_ref *__rec_ref; \
@@ -223,16 +227,16 @@ extern int __real_fileno(FILE *stream);
     (void)__darshan_disabled; \
     if(!__ret || !__path) break; \
     __newpath = darshan_clean_file_path(__path); \
-    if(!__newpath) __newpath = (char*)__path; \
+    if(!__newpath) __newpath = strdup((__path)); \
     __rec_id = darshan_core_gen_record_id(__newpath); \
     __rec_ref = darshan_lookup_record_ref(stdio_runtime->rec_id_hash, &__rec_id, sizeof(darshan_record_id)); \
     if(!__rec_ref) __rec_ref = stdio_track_new_file_record(__rec_id, __newpath); \
     if(!__rec_ref) { \
-        if(__newpath != (char*)__path) free(__newpath); \
+        free(__newpath); \
         break; \
     } \
     _STDIO_RECORD_OPEN(__ret, __rec_ref, __tm1, __tm2, 1, -1); \
-    if(__newpath != (char*)__path) free(__newpath); \
+    free(__newpath); \
     /* LDMS to publish realtime open tracing information to daemon*/ \
     if(dC.ldms_lib)\
         if(dC.stdio_enable_ldms)\
diff --git a/darshan-runtime/lib/lookup8.c b/darshan-runtime/lib/lookup8.c
index 4acb416f1..89c625997 100644
--- a/darshan-runtime/lib/lookup8.c
+++ b/darshan-runtime/lib/lookup8.c
@@ -80,11 +80,12 @@ Use for hash table lookup, or anything where one collision in 2^^64
 is acceptable.  Do NOT use for cryptographic purposes.
 --------------------------------------------------------------------
 */
-
-ub8 darshan_hash( k, length, level)
+#if 0
 const register ub1 *k;        /* the key */
 register ub8  length;   /* the length of the key */
 register ub8  level;    /* the previous hash, or an arbitrary value */
+#endif
+ub8 darshan_hash( const register ub1 *k, register ub8 length, register ub8 level)
 {
   register ub8 a,b,c,len;
 
@@ -150,10 +151,12 @@ register ub8  level;    /* the previous hash, or an arbitrary value */
  -- that the length be the number of ub8's in the key
 --------------------------------------------------------------------
 */
-ub8 hash2( k, length, level)
+#if 0
 register ub8 *k;        /* the key */
 register ub8  length;   /* the length of the key */
 register ub8  level;    /* the previous hash, or an arbitrary value */
+#endif
+ub8 hash2( register ub8 *k, register ub8 length, register ub8 level)
 {
   register ub8 a,b,c,len;
 
@@ -195,10 +198,12 @@ register ub8  level;    /* the previous hash, or an arbitrary value */
 --------------------------------------------------------------------
 */
 
-ub8 hash3( k, length, level)
+#if 0
 register ub1 *k;        /* the key */
 register ub8  length;   /* the length of the key */
 register ub8  level;    /* the previous hash, or an arbitrary value */
+#endif
+ub8 hash3( register ub1 *k, register ub8 length, register ub8 level)
 {
   register ub8 a,b,c,len;
 
diff --git a/darshan-util/darshan-hdf5-logutils.c b/darshan-util/darshan-hdf5-logutils.c
index 925cbe288..79af2f924 100644
--- a/darshan-util/darshan-hdf5-logutils.c
+++ b/darshan-util/darshan-hdf5-logutils.c
@@ -219,7 +219,7 @@ static int darshan_log_get_hdf5_dataset(darshan_fd fd, void** hdf5_buf_p)
     struct darshan_hdf5_dataset *ds = *((struct darshan_hdf5_dataset **)hdf5_buf_p);
     int rec_len;
     int i;
-    int ret;
+    int ret=0;
 
     if(fd->mod_map[DARSHAN_H5D_MOD].len == 0)
         return(0);
diff --git a/darshan-util/darshan-pnetcdf-logutils.c b/darshan-util/darshan-pnetcdf-logutils.c
index 16b5966d3..2c645dfed 100644
--- a/darshan-util/darshan-pnetcdf-logutils.c
+++ b/darshan-util/darshan-pnetcdf-logutils.c
@@ -253,7 +253,7 @@ static int darshan_log_get_pnetcdf_var(darshan_fd fd, void** pnetcdf_buf_p)
     struct darshan_pnetcdf_var *var = *((struct darshan_pnetcdf_var **)pnetcdf_buf_p);
     int rec_len;
     int i;
-    int ret;
+    int ret=0;
 
     if(fd->mod_map[DARSHAN_PNETCDF_VAR_MOD].len == 0)
         return(0);
diff --git a/darshan-util/darshan-stdio-logutils.c b/darshan-util/darshan-stdio-logutils.c
index 315bb576c..f7f05b5ef 100644
--- a/darshan-util/darshan-stdio-logutils.c
+++ b/darshan-util/darshan-stdio-logutils.c
@@ -142,7 +142,7 @@ static int darshan_log_get_stdio_record(darshan_fd fd, void** stdio_buf_p)
     struct darshan_stdio_file *file = *((struct darshan_stdio_file **)stdio_buf_p);
     int rec_len;
     int i;
-    int ret;
+    int ret=0;
 
     if(fd->mod_map[DARSHAN_STDIO_MOD].len == 0)
         return(0);