dbStatic: Better error reports for bad JSON string chars

modules/database/src/ioc/dbStatic/dbLex.l

@@ -101,10 +101,6 @@ static int yyreset(void)
 ")"     return(yytext[0]);
 ","     return(yytext[0]);
 
-{doublequote}({stringchar}|{escape})*{newline} { /* bad string */
-    yyerrorAbort("Newline in string, closing quote missing");
-}
-
 <JSON>"null"    return jsonNULL;
 <JSON>"true"    return jsonTRUE;
 <JSON>"false"   return jsonFALSE;
@@ -130,6 +126,20 @@ static int yyreset(void)
 
 <INITIAL,JSON>{whitespace}  ;
 
+
+  /* Error patterns */
+
+{doublequote}({stringchar}|{escape})*{newline} {
+    yyerrorAbort("Newline in string, closing quote missing");
+}
+
+<JSON>{doublequote}({stringchar}|{escape})*{doublequote} {
+    yyerrorAbort("Bad character in JSON string");
+}
+<JSON>{singlequote}({stringchar}|{escape})*{singlequote} {
+    yyerrorAbort("Bad character in JSON string");
+}
+
 <INITIAL,JSON>. {
     char message[40];
     YY_BUFFER_STATE *dummy=0;

modules/database/src/ioc/dbStatic/dbYacc.y

@@ -374,7 +374,7 @@ static int yyerror(char *str)
     else
         epicsPrintf("Error");
     if (!yyFailed) {    /* Only print this stuff once */
-        epicsPrintf(" at or before \"%s\"", yytext);
+        epicsPrintf(" at or before '%s'", yytext);
         dbIncludePrint();
         yyFailed = TRUE;
     }