- Fix MDEV-7489 (in add_field)

modified:
  storage/connect/ha_connect.cc

- Fix MDEV-7494 (adding Insert_quoted in the STRING class)
modified:
  storage/connect/tabmysql.cpp
  storage/connect/xobject.cpp
  storage/connect/xobject.h

- Fix MDEV-7498 in value.cpp (AllocateValue)
modified:
  storage/connect/value.cpp

- Handle backslash in Json serialize + uchar + typo.
modified:
  storage/connect/json.cpp
  storage/connect/tabjson.cpp

storage/connect/ha_connect.cc

@@ -4620,7 +4620,7 @@ static bool add_field(String *sql, const char *field_name, int typ,
                       char *dft, char *xtra, int flag, bool dbf, char v)
 {
   char var = (len > 255) ? 'V' : v;
-  bool error= false;
+  bool q, error= false;
   const char *type= PLGtoMYSQLtype(typ, dbf, var);
 
   error|= sql->append('`');
@@ -4661,7 +4661,12 @@ static bool add_field(String *sql, const char *field_name, int typ,
   if (dft && *dft) {
     error|= sql->append(" DEFAULT ");
 
-    if (!IsTypeNum(typ)) {
+    if (typ == TYPE_DATE)
+      q = (strspn(dft, "0123456789 -:/") == strlen(dft));
+    else
+      q = !IsTypeNum(typ);
+
+    if (q) {
       error|= sql->append("'");
       error|= sql->append_for_single_quote(dft, strlen(dft));
       error|= sql->append("'");

storage/connect/json.cpp

@@ -312,18 +312,19 @@ PJVAL ParseValue(PGLOBAL g, int& i, STRG& src)
 /***********************************************************************/
 char *ParseString(PGLOBAL g, int& i, STRG& src)
 {
-  char *p, *s = src.str;
-  int   n = 0, len = src.len;
+  char  *s = src.str;
+  uchar *p;
+  int    n = 0, len = src.len;
 
   // The size to allocate is not known yet
-  p = (char*)PlugSubAlloc(g, NULL, 0);
+  p = (uchar*)PlugSubAlloc(g, NULL, 0);
 
   for (; i < len; i++)
     switch (s[i]) {
       case '"':
         p[n++] = 0;
         PlugSubAlloc(g, NULL, n);
-        return p;
+        return (char*)p;
       case '\\':
         if (++i < len) {
           if (s[i] == 'u') {
@@ -675,12 +676,13 @@ bool JOUTSTR::Escape(const char *s)
 
   for (unsigned int i = 0; i < strlen(s); i++)
     switch (s[i]) {
+      case '"':  
+      case '\\':
       case '\t':
       case '\n':
       case '\r':
       case '\b':
-      case '\f':
-      case '"':  WriteChr('\\');
+      case '\f': WriteChr('\\');
         // passthru
       default:
         WriteChr(s[i]);

storage/connect/tabjson.cpp

 /************* tabjson C++ Program Source Code File (.CPP) *************/
-/* PROGRAM NAME: tabxjson     Version 1.0                              */
+/* PROGRAM NAME: tabjson     Version 1.0                               */
 /*  (C) Copyright to the author Olivier BERTRAND          2014 - 2015  */
 /*  This program are the JSON class DB execution routines.             */
 /***********************************************************************/

storage/connect/tabmysql.cpp

@@ -1141,19 +1141,16 @@ int TDBMYSQL::WriteDB(PGLOBAL g)
   int  rc;
   uint len = Query->GetLength();
   char buf[64];
-  bool b, oom = false;
+  bool oom = false;
 
   // Make the Insert command value list
   for (PCOL colp = Columns; colp; colp = colp->GetNext()) {
     if (!colp->GetValue()->IsNull()) {
-      if ((b = colp->GetResultType() == TYPE_STRING ||
-               colp->GetResultType() == TYPE_DATE))
-        oom |= Query->Append('\'');
-  
-      oom |= Query->Append(colp->GetValue()->GetCharString(buf));
-  
-      if (b)
-        oom |= Query->Append('\'');
+      if (colp->GetResultType() == TYPE_STRING ||
+          colp->GetResultType() == TYPE_DATE)
+        oom |= Query->Append_quoted(colp->GetValue()->GetCharString(buf));
+      else
+        oom |= Query->Append(colp->GetValue()->GetCharString(buf));
   
     } else
       oom |= Query->Append("NULL");

storage/connect/value.cpp

@@ -443,8 +443,13 @@ PVAL AllocateValue(PGLOBAL g, PVAL valp, int newtype, int uns)
     case TYPE_STRING:
       p = (PSZ)PlugSubAlloc(g, NULL, 1 + valp->GetValLen());
 
-      if ((sp = valp->GetCharString(p)) != p)
-        strcpy (p, sp);
+      if ((sp = valp->GetCharString(p)) != p) {
+        if (sp)
+          strcpy (p, sp);
+        else
+          *p = 0;
+
+        } // endif sp
 
       vp = new(g) TYPVAL<PSZ>(g, p, valp->GetValLen(), valp->GetValPrec());
       break;

storage/connect/xobject.cpp

@@ -346,6 +346,31 @@ bool STRING::Append(char c)
   return false;
 } // end of Append
 
+/***********************************************************************/
+/*  Append a quoted PSZ to a STRING.                                   */
+/***********************************************************************/
+bool STRING::Append_quoted(PSZ s)
+{
+  bool b = Append('\'');
+
+  if (s) for (char *p = s; !b && *p; p++)
+    switch (*p) {
+      case '\'':
+      case '\\':
+      case '\t':
+      case '\n':
+      case '\r':
+      case '\b':
+      case '\f': b |= Append('\\');
+        // passthru
+      default:
+        b |= Append(*p);
+        break;
+      } // endswitch *p
+
+  return (b |= Append('\''));
+} // end of Append_quoted
+
 /***********************************************************************/
 /*  Resize to given length but only when last suballocated.            */
 /*  New size should be greater than string length.                     */

storage/connect/xobject.h

@@ -138,6 +138,7 @@ class DllExport STRING : public BLOCK {
          bool   Append(STRING &str);
          bool   Append(char c);
          bool   Resize(uint n);
+         bool   Append_quoted(PSZ s);
   inline void   Trim(void) {(void)Resize(Length + 1);}
   inline void   Chop(void) {if (Length) Strp[--Length] = 0;}
   inline void   RepLast(char c) {if (Length) Strp[Length-1] = c;}