seq: pvAssign now does macro substitution, like assign syntax

src/seq/seq_if.c

@@ -531,10 +531,11 @@ epicsShareFunc pvStat epicsShareAPI seq_pvAssign(SS_ID ss, VAR_ID varId, const c
 	CHAN	*ch = sp->chan + varId;
 	pvStat	status = pvStatOK;
 	DBCHAN	*dbch = ch->dbch;
+	char	new_pv_name[100];
 
-	if (!pvName) pvName = "";
+	seqMacEval(sp, pvName, new_pv_name, sizeof(new_pv_name));
 
-	DEBUG("Assign %s to \"%s\"\n", ch->varName, pvName);
+	DEBUG("Assign %s to \"%s\"\n", ch->varName, new_pv_name);
 
 	epicsMutexMustLock(sp->programLock);
 
@@ -564,7 +565,7 @@ epicsShareFunc pvStat epicsShareAPI seq_pvAssign(SS_ID ss, VAR_ID varId, const c
 		free(dbch->dbName);
 	}
 
-	if (pvName == NULL || pvName[0] == 0)	/* new name is empty -> free resources */
+	if (new_pv_name[0] == 0)	/* new name is empty -> free resources */
 	{
 		if (dbch) {
 			free(ch->dbch->ssMetaData);
@@ -582,7 +583,7 @@ epicsShareFunc pvStat epicsShareAPI seq_pvAssign(SS_ID ss, VAR_ID varId, const c
 				return pvStatERROR;
 			}
 		}
-		dbch->dbName = epicsStrDup(pvName);
+		dbch->dbName = epicsStrDup(new_pv_name);
 		if (!dbch->dbName)
 		{
 			errlogSevPrintf(errlogFatal, "pvAssign: epicsStrDup failed\n");

src/seq/seq_mac.c

@@ -37,8 +37,17 @@ void seqMacEval(SPROG *sp, const char *inStr, char *outStr, size_t maxChar)
 	char	name[50], *value, *tmp;
 	size_t	valLth, nameLth;
 
+	assert(outStr);
+	assert(maxChar > 0);
+
 	DEBUG("seqMacEval: InStr=%s, ", inStr);
 
+	if (!inStr)
+	{
+		*outStr = 0;
+		return;
+	}
+
 	tmp = outStr;
 	while (*inStr != 0 && maxChar > 0)
 	{
@@ -56,7 +65,7 @@ void seqMacEval(SPROG *sp, const char *inStr, char *outStr, size_t maxChar)
 			name[nameLth] = 0;
 			if (*inStr != 0)
 				inStr++;
-				
+
 			DEBUG("Macro name=%s, ", name);
 
 			/* Find macro value from macro name */