~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include <drizzled/server_includes.h>

#include CSTDINT_H

#include <drizzled/function/str/pad.h>

#include <drizzled/error.h>

#include <drizzled/function/str/alloc_buffer.h>

#include <drizzled/session.h>

void Item_func_rpad::fix_length_and_dec()

{

  // Handle character set for args[0] and args[2].

  if (agg_arg_charsets(collation, &args[0], 2, MY_COLL_ALLOW_CONV, 2))

    return;

  if (args[1]->const_item())

  {

    uint64_t length= 0;

    if (collation.collation->mbmaxlen > 0)

    {

      uint64_t temp= (uint64_t) args[1]->val_int();

      /* Assumes that the maximum length of a String is < INT32_MAX. */

      /* Set here so that rest of code sees out-of-bound value as such. */

      if (temp > INT32_MAX)

	temp = INT32_MAX;

      length= temp * collation.collation->mbmaxlen;

    }

    if (length >= MAX_BLOB_WIDTH)

    {

      length= MAX_BLOB_WIDTH;

      maybe_null= 1;

    }

    max_length= (ulong) length;

  }

  else

  {

    max_length= MAX_BLOB_WIDTH;

    maybe_null= 1;

  }

}

String *Item_func_rpad::val_str(String *str)

{

  assert(fixed == 1);

  uint32_t res_byte_length,res_char_length,pad_char_length,pad_byte_length;

  char *to;

  const char *ptr_pad;

  /* must be int64_t to avoid truncation */

  int64_t count= args[1]->val_int();

  int64_t byte_count;

  String *res= args[0]->val_str(str);

  String *rpad= args[2]->val_str(&rpad_str);

  if (!res || args[1]->null_value || !rpad ||

      ((count < 0) && !args[1]->unsigned_flag))

    goto err;

  null_value=0;

  /* Assumes that the maximum length of a String is < INT32_MAX. */

  /* Set here so that rest of code sees out-of-bound value as such. */

  if ((uint64_t) count > INT32_MAX)

    count= INT32_MAX;

  if (count <= (res_char_length= res->numchars()))

  {						// String to pad is big enough

    res->length(res->charpos((int) count));	// Shorten result if longer

    return (res);

  }

  pad_char_length= rpad->numchars();

  byte_count= count * collation.collation->mbmaxlen;

  if ((uint64_t) byte_count > current_session->variables.max_allowed_packet)

  {

    push_warning_printf(current_session, DRIZZLE_ERROR::WARN_LEVEL_WARN,

			ER_WARN_ALLOWED_PACKET_OVERFLOWED,

			ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),

			func_name(), current_session->variables.max_allowed_packet);

    goto err;

  }

  if (args[2]->null_value || !pad_char_length)

    goto err;

  res_byte_length= res->length();	/* Must be done before alloc_buffer */

  if (!(res= alloc_buffer(res,str,&tmp_value, (ulong) byte_count)))

    goto err;

  to= (char*) res->ptr()+res_byte_length;

  ptr_pad=rpad->ptr();

  pad_byte_length= rpad->length();

  count-= res_char_length;

  for ( ; (uint32_t) count > pad_char_length; count-= pad_char_length)

  {

    memcpy(to,ptr_pad,pad_byte_length);

    to+= pad_byte_length;

  }

  if (count)

  {

    pad_byte_length= rpad->charpos((int) count);

    memcpy(to,ptr_pad,(size_t) pad_byte_length);

    to+= pad_byte_length;

  }

  res->length(to- (char*) res->ptr());

  return (res);

 err:

  null_value=1;

  return 0;

}

void Item_func_lpad::fix_length_and_dec()

{

  // Handle character set for args[0] and args[2].

  if (agg_arg_charsets(collation, &args[0], 2, MY_COLL_ALLOW_CONV, 2))

    return;

  if (args[1]->const_item())

  {

    uint64_t length= 0;

    if (collation.collation->mbmaxlen > 0)

    {

      uint64_t temp= (uint64_t) args[1]->val_int();

      /* Assumes that the maximum length of a String is < INT32_MAX. */

      /* Set here so that rest of code sees out-of-bound value as such. */

      if (temp > INT32_MAX)

        temp= INT32_MAX;

      length= temp * collation.collation->mbmaxlen;

    }

    if (length >= MAX_BLOB_WIDTH)

    {

      length= MAX_BLOB_WIDTH;

      maybe_null= 1;

    }

    max_length= (ulong) length;

  }

  else

  {

    max_length= MAX_BLOB_WIDTH;

    maybe_null= 1;

  }

}

String *Item_func_lpad::val_str(String *str)

{

  assert(fixed == 1);

  uint32_t res_char_length,pad_char_length;

  /* must be int64_t to avoid truncation */

  int64_t count= args[1]->val_int();

  int64_t byte_count;

  String *res= args[0]->val_str(&tmp_value);

  String *pad= args[2]->val_str(&lpad_str);

  if (!res || args[1]->null_value || !pad ||

      ((count < 0) && !args[1]->unsigned_flag))

    goto err;

  null_value=0;

  /* Assumes that the maximum length of a String is < INT32_MAX. */

  /* Set here so that rest of code sees out-of-bound value as such. */

  if ((uint64_t) count > INT32_MAX)

    count= INT32_MAX;

  res_char_length= res->numchars();

  if (count <= res_char_length)

  {

    res->length(res->charpos((int) count));

    return res;

  }

  pad_char_length= pad->numchars();

  byte_count= count * collation.collation->mbmaxlen;

  if ((uint64_t) byte_count > current_session->variables.max_allowed_packet)

  {

    push_warning_printf(current_session, DRIZZLE_ERROR::WARN_LEVEL_WARN,

			ER_WARN_ALLOWED_PACKET_OVERFLOWED,

			ER(ER_WARN_ALLOWED_PACKET_OVERFLOWED),

			func_name(), current_session->variables.max_allowed_packet);

    goto err;

  }

  if (args[2]->null_value || !pad_char_length ||

      str->alloc((uint32_t) byte_count))

    goto err;

  str->length(0);

  str->set_charset(collation.collation);

  count-= res_char_length;

  while (count >= pad_char_length)

  {

    str->append(*pad);

    count-= pad_char_length;

  }

  if (count > 0)

    str->append(pad->ptr(), pad->charpos((int) count), collation.collation);

  str->append(*res);

  null_value= 0;

  return str;

err:

  null_value= 1;

  return 0;

}