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#include <mysql2_ext.h>
#include <errno.h>
#ifndef _MSC_VER
#include <unistd.h>
#endif
#include <fcntl.h>
#define ERROR_LEN 1024
typedef struct
{
int fd;
char *filename;
char error[ERROR_LEN];
mysql_client_wrapper *wrapper;
} mysql2_local_infile_data;
/* MySQL calls this function when a user begins a LOAD DATA LOCAL INFILE query.
*
* Allocate a data struct and pass it back through the data pointer.
*
* Returns:
* 0 on success
* 1 on error
*/
static int
mysql2_local_infile_init(void **ptr, const char *filename, void *userdata)
{
mysql2_local_infile_data *data = malloc(sizeof(mysql2_local_infile_data));
if (!data) return 1;
*ptr = data;
data->error[0] = 0;
data->wrapper = userdata;
data->filename = strdup(filename);
if (!data->filename) {
snprintf(data->error, ERROR_LEN, "%s: %s", strerror(errno), filename);
return 1;
}
data->fd = open(filename, O_RDONLY);
if (data->fd < 0) {
snprintf(data->error, ERROR_LEN, "%s: %s", strerror(errno), filename);
return 1;
}
return 0;
}
/* MySQL calls this function to read data from the local file.
*
* Returns:
* > 0 number of bytes read
* == 0 end of file
* < 0 error
*/
static int
mysql2_local_infile_read(void *ptr, char *buf, unsigned int buf_len)
{
int count;
mysql2_local_infile_data *data = (mysql2_local_infile_data *)ptr;
count = (int)read(data->fd, buf, buf_len);
if (count < 0) {
snprintf(data->error, ERROR_LEN, "%s: %s", strerror(errno), data->filename);
}
return count;
}
/* MySQL calls this function when we're done with the LOCAL INFILE query.
*
* ptr will be null if the init function failed.
*/
static void
mysql2_local_infile_end(void *ptr)
{
mysql2_local_infile_data *data = (mysql2_local_infile_data *)ptr;
if (data) {
if (data->fd >= 0)
close(data->fd);
if (data->filename)
free(data->filename);
free(data);
}
}
/* MySQL calls this function if any of the functions above returned an error.
*
* This function is called even if init failed, with whatever ptr value
* init has set, regardless of the return value of the init function.
*
* Returns:
* Error message number (see http://dev.mysql.com/doc/refman/5.0/en/error-messages-client.html)
*/
static int
mysql2_local_infile_error(void *ptr, char *error_msg, unsigned int error_msg_len)
{
mysql2_local_infile_data *data = (mysql2_local_infile_data *) ptr;
if (data) {
snprintf(error_msg, error_msg_len, "%s", data->error);
return CR_UNKNOWN_ERROR;
}
snprintf(error_msg, error_msg_len, "Out of memory");
return CR_OUT_OF_MEMORY;
}
/* Tell MySQL Client to use our own local_infile functions.
* This is both due to bugginess in the default handlers,
* and to improve the Rubyness of the handlers here.
*/
void mysql2_set_local_infile(MYSQL *mysql, void *userdata)
{
mysql_set_local_infile_handler(mysql,
mysql2_local_infile_init,
mysql2_local_infile_read,
mysql2_local_infile_end,
mysql2_local_infile_error, userdata);
}
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