Bug#13986705 CRASH IN GET_INTERVAL_VALUE() WITH DATE CALCULATION WITH UTF32 INTERVALS

This is a followup to the fix for Bug#12340997
get_interval_value() was trying to parse the input string,
looking for leading '-' while skipping whitespace.
The macro my_isspace() does not work for utf32 character set,
since my_charset_utf32_general_ci.ctype == NULL.

Solution: convert input to ASCII before parsing,
and use the character set of the returned ASCII string.

sql/item_timefunc.cc

@@ -865,28 +865,43 @@ bool make_date_time(DATE_TIME_FORMAT *format, MYSQL_TIME *l_time,
   from the high end. This allows one to give:
   DAY_TO_SECOND as "D MM:HH:SS", "MM:HH:SS" "HH:SS" or as seconds.
 
-  @param length:         length of str
-  @param cs:             charset of str
-  @param values:         array of results
+  @param args            item expression which we convert to an ASCII string
+  @param str_value       string buffer
+  @param is_negative     set to true if interval is prefixed by '-'
   @param count:          count of elements in result array
+  @param values:         array of results
   @param transform_msec: if value is true we suppose
                          that the last part of string value is microseconds
                          and we should transform value to six digit value.
                          For example, '1.1' -> '1.100000'
 */
 
-static bool get_interval_info(const char *str,uint length,CHARSET_INFO *cs,
+static bool get_interval_info(Item *args,
+                              String *str_value,
+                              bool *is_negative,
                               uint count, ulonglong *values,
                               bool transform_msec)
 {
-  const char *end=str+length;
-  uint i;
-  long msec_length= 0;
+  String *res;
+  if (!(res= args->val_str_ascii(str_value)))
+    return true;
 
-  while (str != end && !my_isdigit(cs,*str))
+  CHARSET_INFO *cs= res->charset();
+  const char *str= res->ptr();
+  const char *end= str + res->length();
+
+  str+= cs->cset->scan(cs, str, end, MY_SEQ_SPACES);
+  if (str < end && *str == '-')
+  {
+    *is_negative= true;
     str++;
+  }
 
-  for (i=0 ; i < count ; i++)
+  while (str < end && !my_isdigit(cs,*str))
+    str++;
+
+  long msec_length= 0;
+  for (uint i=0 ; i < count ; i++)
   {
     longlong value;
     const char *start= str;
@@ -1427,45 +1442,24 @@ longlong Item_func_time_to_sec::val_int()
   To make code easy, allow interval objects without separators.
 */
 
-bool get_interval_value(Item *args,interval_type int_type,
-			       String *str_value, INTERVAL *interval)
+bool get_interval_value(Item *args, interval_type int_type,
+                        String *str_value, INTERVAL *interval)
 {
   ulonglong array[5];
   longlong UNINIT_VAR(value);
-  const char *UNINIT_VAR(str);
-  size_t UNINIT_VAR(length);
-  CHARSET_INFO *cs=str_value->charset();
 
   bzero((char*) interval,sizeof(*interval));
   if ((int) int_type <= INTERVAL_MICROSECOND)
   {
     value= args->val_int();
     if (args->null_value)
-      return 1;
+      return true;
     if (value < 0)
     {
-      interval->neg=1;
+      interval->neg= true;
       value= -value;
     }
   }
-  else
-  {
-    String *res;
-    if (!(res= args->val_str_ascii(str_value)))
-      return (1);
-
-    /* record negative intervalls in interval->neg */
-    str=res->ptr();
-    const char *end=str+res->length();
-    while (str != end && my_isspace(cs,*str))
-      str++;
-    if (str != end && *str == '-')
-    {
-      interval->neg=1;
-      str++;
-    }
-    length= (size_t) (end-str);		// Set up pointers to new str
-  }
 
   switch (int_type) {
   case INTERVAL_YEAR:
@@ -1486,88 +1480,88 @@ bool get_interval_value(Item *args,interval_type int_type,
   case INTERVAL_HOUR:
     interval->hour= (ulong) value;
     break;
-  case INTERVAL_MICROSECOND:
-    interval->second_part=value;
-    break;
   case INTERVAL_MINUTE:
     interval->minute=value;
     break;
   case INTERVAL_SECOND:
     interval->second=value;
     break;
+  case INTERVAL_MICROSECOND:
+    interval->second_part=value;
+    break;
   case INTERVAL_YEAR_MONTH:			// Allow YEAR-MONTH YYYYYMM
-    if (get_interval_info(str,length,cs,2,array,0))
-      return (1);
+    if (get_interval_info(args, str_value, &interval->neg, 2, array, false))
+      return true;
     interval->year=  (ulong) array[0];
     interval->month= (ulong) array[1];
     break;
   case INTERVAL_DAY_HOUR:
-    if (get_interval_info(str,length,cs,2,array,0))
-      return (1);
+    if (get_interval_info(args, str_value, &interval->neg, 2, array, false))
+      return true;
     interval->day=  (ulong) array[0];
     interval->hour= (ulong) array[1];
     break;
-  case INTERVAL_DAY_MICROSECOND:
-    if (get_interval_info(str,length,cs,5,array,1))
-      return (1);
-    interval->day=    (ulong) array[0];
-    interval->hour=   (ulong) array[1];
-    interval->minute= array[2];
-    interval->second= array[3];
-    interval->second_part= array[4];
-    break;
   case INTERVAL_DAY_MINUTE:
-    if (get_interval_info(str,length,cs,3,array,0))
-      return (1);
+    if (get_interval_info(args, str_value, &interval->neg, 3, array, false))
+      return true;
     interval->day=    (ulong) array[0];
     interval->hour=   (ulong) array[1];
     interval->minute= array[2];
     break;
   case INTERVAL_DAY_SECOND:
-    if (get_interval_info(str,length,cs,4,array,0))
-      return (1);
+    if (get_interval_info(args, str_value, &interval->neg, 4, array, false))
+      return true;
     interval->day=    (ulong) array[0];
     interval->hour=   (ulong) array[1];
     interval->minute= array[2];
     interval->second= array[3];
     break;
-  case INTERVAL_HOUR_MICROSECOND:
-    if (get_interval_info(str,length,cs,4,array,1))
-      return (1);
-    interval->hour=   (ulong) array[0];
-    interval->minute= array[1];
-    interval->second= array[2];
-    interval->second_part= array[3];
-    break;
   case INTERVAL_HOUR_MINUTE:
-    if (get_interval_info(str,length,cs,2,array,0))
-      return (1);
+    if (get_interval_info(args, str_value, &interval->neg, 2, array, false))
+      return true;
     interval->hour=   (ulong) array[0];
     interval->minute= array[1];
     break;
   case INTERVAL_HOUR_SECOND:
-    if (get_interval_info(str,length,cs,3,array,0))
-      return (1);
+    if (get_interval_info(args, str_value, &interval->neg, 3, array, false))
+      return true;
     interval->hour=   (ulong) array[0];
     interval->minute= array[1];
     interval->second= array[2];
     break;
-  case INTERVAL_MINUTE_MICROSECOND:
-    if (get_interval_info(str,length,cs,3,array,1))
-      return (1);
+  case INTERVAL_MINUTE_SECOND:
+    if (get_interval_info(args, str_value, &interval->neg, 2, array, false))
+      return true;
     interval->minute= array[0];
     interval->second= array[1];
-    interval->second_part= array[2];
     break;
-  case INTERVAL_MINUTE_SECOND:
-    if (get_interval_info(str,length,cs,2,array,0))
-      return (1);
+  case INTERVAL_DAY_MICROSECOND:
+    if (get_interval_info(args, str_value, &interval->neg, 5, array, true))
+      return true;
+    interval->day=    (ulong) array[0];
+    interval->hour=   (ulong) array[1];
+    interval->minute= array[2];
+    interval->second= array[3];
+    interval->second_part= array[4];
+    break;
+  case INTERVAL_HOUR_MICROSECOND:
+    if (get_interval_info(args, str_value, &interval->neg, 4, array, true))
+      return true;
+    interval->hour=   (ulong) array[0];
+    interval->minute= array[1];
+    interval->second= array[2];
+    interval->second_part= array[3];
+    break;
+  case INTERVAL_MINUTE_MICROSECOND:
+    if (get_interval_info(args, str_value, &interval->neg, 3, array, true))
+      return true;
     interval->minute= array[0];
     interval->second= array[1];
+    interval->second_part= array[2];
     break;
   case INTERVAL_SECOND_MICROSECOND:
-    if (get_interval_info(str,length,cs,2,array,1))
-      return (1);
+    if (get_interval_info(args, str_value, &interval->neg, 2, array, true))
+      return true;
     interval->second= array[0];
     interval->second_part= array[1];
     break;
@@ -1575,7 +1569,7 @@ bool get_interval_value(Item *args,interval_type int_type,
     DBUG_ASSERT(0); 
     break;            /* purecov: end */
   }
-  return 0;
+  return false;
 }