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/* Copyright (C) 2008 MySQL AB
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 Street, Fifth Floor, Boston, MA 02110-1335 USA */
#include "../maria_def.h"
#include "sequence_storage.h"
/**
@brief Initializes the sequence from the sequence file.
@param seq Reference on the sequence storage.
@param file Path to the file where to write the sequence
@retval 0 OK
@retval 1 Error
*/
my_bool seq_storage_reader_init(SEQ_STORAGE *seq, const char *file)
{
FILE *fd;
seq->pos= 0;
if ((fd= my_fopen(file, O_RDONLY, MYF(MY_WME))) == NULL)
return 1;
if (my_init_dynamic_array(PSI_NOT_INSTRUMENTED, &seq->seq, sizeof(ulong), 10,
10, MYF(0)))
return 1;
for(;;)
{
ulong num;
char line[22];
if (fgets(line, sizeof(line), fd) == NULL)
break;
num= atol(line);
if (insert_dynamic(&seq->seq, (uchar*) &num))
return 1;
}
fclose(fd);
return 0;
}
/**
@brief Gets next number from the sequence storage
@param seq Reference on the sequence storage.
@return Next number from the sequence.
*/
ulong seq_storage_next(SEQ_STORAGE *seq)
{
DBUG_ASSERT(seq->seq.elements > 0);
DBUG_ASSERT(seq->pos < seq->seq.elements);
return (*(dynamic_element(&seq->seq, seq->pos++, ulong *)));
}
/**
@brief Frees resources allocated for the storage
@param seq Reference on the sequence storage.
*/
void seq_storage_destroy(SEQ_STORAGE *seq)
{
delete_dynamic(&seq->seq);
}
/**
@brief Starts the sequence from beginning
@param seq Reference on the sequence storage.
*/
void seq_storage_rewind(SEQ_STORAGE *seq)
{
seq->pos= 0;
}
/**
@brief Writes a number to the sequence file.
@param file Path to the file where to write the sequence
@pagem num Number to be written
@retval 0 OK
@retval 1 Error
*/
my_bool seq_storage_write(const char *file, ulong num)
{
FILE *fd;
return ((fd= my_fopen(file, O_CREAT | O_APPEND | O_WRONLY, MYF(MY_WME))) ==
NULL ||
fprintf(fd, "%lu\n", num) < 0 ||
fclose(fd) != 0);
}
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