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00020 #include <config.h>
00021
00022 #include <drizzled/function/str/insert.h>
00023 #include <drizzled/error.h>
00024 #include <drizzled/session.h>
00025
00026 namespace drizzled
00027 {
00028
00029 String *Item_func_insert::val_str(String *str)
00030 {
00031 assert(fixed == 1);
00032 String *res,*res2;
00033 int64_t start, length;
00034
00035 null_value=0;
00036 res=args[0]->val_str(str);
00037 res2=args[3]->val_str(&tmp_value);
00038 start= args[1]->val_int() - 1;
00039 length= args[2]->val_int();
00040
00041 if (args[0]->null_value || args[1]->null_value || args[2]->null_value ||
00042 args[3]->null_value)
00043 goto null;
00044
00045 if ((start < 0) || (start > static_cast<int64_t>(res->length())))
00046 return res;
00047 if ((length < 0) || (length > static_cast<int64_t>(res->length())))
00048 length= res->length();
00049
00050
00051 start= res->charpos((int) start);
00052 length= res->charpos((int) length, (uint32_t) start);
00053
00054
00055 if (start > static_cast<int64_t>(res->length()))
00056 return res;
00057 if (length > static_cast<int64_t>(res->length()) - start)
00058 length= res->length() - start;
00059
00060 if ((uint64_t) (res->length() - length + res2->length()) >
00061 (uint64_t) session.variables.max_allowed_packet)
00062 {
00063 push_warning_printf(&session, DRIZZLE_ERROR::WARN_LEVEL_WARN,
00064 ER_WARN_ALLOWED_PACKET_OVERFLOWED,
00065 ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),
00066 func_name(), session.variables.max_allowed_packet);
00067 goto null;
00068 }
00069 res=copy_if_not_alloced(str,res,res->length());
00070 res->replace((uint32_t) start,(uint32_t) length,*res2);
00071 return res;
00072 null:
00073 null_value=1;
00074 return 0;
00075 }
00076
00077
00078 void Item_func_insert::fix_length_and_dec()
00079 {
00080 uint64_t max_result_length;
00081
00082
00083 if (agg_arg_charsets(collation, &args[0], 2, MY_COLL_ALLOW_CONV, 3))
00084 return;
00085 max_result_length= ((uint64_t) args[0]->max_length+
00086 (uint64_t) args[3]->max_length);
00087 if (max_result_length >= MAX_BLOB_WIDTH)
00088 {
00089 max_result_length= MAX_BLOB_WIDTH;
00090 maybe_null= 1;
00091 }
00092 max_length= (ulong) max_result_length;
00093 }
00094
00095 }