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Bug #29804 UDF parameters don't contain correct string length

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Previously, UDF *_init functions were passed constant strings with erroneous lengths.
The length came from the containing variable's size, not the length of the value itself.
  
Now the *_init functions get the constant as a null terminated string with the correct
length supplied too.
This commit is contained in:
dkatz@damien-katzs-computer.local
2007-09-05 15:06:10 -04:00
parent f64ef11906
commit d8e67d4556
5 changed files with 99 additions and 1 deletions
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35
sql/udf_example.c
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@ -1106,4 +1106,39 @@ char * is_const(UDF_INIT *initid, UDF_ARGS *args __attribute__((unused)),
}
my_bool check_const_len_init(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
if (args->arg_count != 1)
{
strmov(message, "CHECK_CONST_LEN accepts only one argument");
return 1;
}
if (args->args[0] == 0)
{
initid->ptr= (char*)"Not constant";
}
else if(strlen(args->args[0]) == args->lengths[0])
{
initid->ptr= (char*)"Correct length";
}
else
{
initid->ptr= (char*)"Wrong length";
}
initid->max_length = 100;
return 0;
}
char * check_const_len(UDF_INIT *initid, UDF_ARGS *args __attribute__((unused)),
char *result, unsigned long *length,
char *is_null, char *error __attribute__((unused)))
{
strmov(result, initid->ptr);
*length= strlen(result);
*is_null= 0;
return result;
}
#endif /* HAVE_DLOPEN */