allow null string or *

src/db/dbCaTest.c

@@ -67,8 +67,8 @@ long epicsShareAPI dbcar(char	*precordname,int level)
     caLink		*pca;
     int			j;
 
-
-    if(precordname && *precordname==0) precordname=0;
+    if (precordname && ((*precordname == '\0') || !strcmp(precordname,"*")))
+        precordname = NULL;
     dbInitEntry(pdbbase,pdbentry);
     status = dbFirstRecordType(pdbentry);
     while(!status) {

src/db/dbLock.c

@@ -486,6 +486,8 @@ long epicsShareAPI dblsr(char *recordname,int level)
 
     printf("globalLock %p\n",globalLock);
     printf("lockSetModifyLock %p\n",lockSetModifyLock);
+    if (recordname && ((*recordname == '\0') || !strcmp(recordname,"*")))
+        recordname = NULL;
     if(recordname) {
         dbInitEntry(pdbbase,pdbentry);
         status = dbFindRecord(pdbentry,recordname);

src/db/dbTest.c

@@ -100,6 +100,9 @@ long epicsShareAPI dbl(
     char	*fieldnames = 0;
     char 	**papfields = 0;
 
+    if(precordTypename
+    && ((*precordTypename == '\0') || !strcmp(precordTypename,"*")))
+        precordTypename = NULL;
     if (fields && (*fields == '\0'))
         fields = NULL;
     if(fields) {
@@ -673,6 +676,8 @@ long epicsShareAPI dbior(const char *pdrvName,int interest_level)
         fprintf(stderr,"no database has been loaded\n");
         return(0);
     }
+    if(pdrvName && ((*pdrvName == '\0') || !strcmp(pdrvName,"*")))
+        pdrvName = NULL;
     for(pdrvSup = (drvSup *)ellFirst(&pdbbase->drvList); pdrvSup;
     pdrvSup = (drvSup *)ellNext(&pdrvSup->node)) {
 	pname = pdrvSup->name;