solanum-vs-hackint-and-char.../bandb/rsdb_sqlite3.c

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/* src/rsdb_sqlite.h
* Contains the code for the sqlite database backend.
*
* Copyright (C) 2003-2006 Lee Hardy <leeh@leeh.co.uk>
* Copyright (C) 2003-2006 ircd-ratbox development team
*
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* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1.Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2.Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3.The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "stdinc.h"
#include "rsdb.h"
#include <sqlite3.h>
struct sqlite3 *rb_bandb;
rsdb_error_cb *error_cb;
static void
mlog(const char *errstr, ...)
{
if(error_cb != NULL)
{
char buf[256];
va_list ap;
va_start(ap, errstr);
vsnprintf(buf, sizeof(buf), errstr, ap);
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va_end(ap);
error_cb(buf);
}
else
exit(1);
}
int
rsdb_init(rsdb_error_cb * ecb)
{
const char *bandb_dbpath_env;
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char dbpath[PATH_MAX];
char errbuf[128];
error_cb = ecb;
/* try a path from the environment first, useful for basedir overrides */
bandb_dbpath_env = getenv("BANDB_DBPATH");
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if(bandb_dbpath_env != NULL)
rb_strlcpy(dbpath, bandb_dbpath_env, sizeof(dbpath));
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else
rb_strlcpy(dbpath, DBPATH, sizeof(dbpath));
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if(sqlite3_open(dbpath, &rb_bandb) != SQLITE_OK)
{
snprintf(errbuf, sizeof(errbuf), "Unable to open sqlite database: %s",
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sqlite3_errmsg(rb_bandb));
mlog(errbuf);
return -1;
}
if(access(dbpath, W_OK))
{
snprintf(errbuf, sizeof(errbuf), "Unable to open sqlite database for write: %s", strerror(errno));
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mlog(errbuf);
return -1;
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}
return 0;
}
void
rsdb_shutdown(void)
{
if(rb_bandb)
sqlite3_close(rb_bandb);
}
const char *
rsdb_quote(const char *src)
{
static char buf[BUFSIZE * 4];
char *p = buf;
/* cheap and dirty length check.. */
if(strlen(src) >= (sizeof(buf) / 2))
return NULL;
while(*src)
{
if(*src == '\'')
*p++ = '\'';
*p++ = *src++;
}
*p = '\0';
return buf;
}
static int
rsdb_callback_func(void *cbfunc, int argc, char **argv, char **colnames)
{
rsdb_callback cb = (rsdb_callback)((uintptr_t)cbfunc);
(cb) (argc, (const char **)(void *)argv);
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return 0;
}
void
rsdb_exec(rsdb_callback cb, const char *format, ...)
{
static char buf[BUFSIZE * 4];
va_list args;
char *errmsg;
unsigned int i;
int j;
va_start(args, format);
i = rs_vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
if(i >= sizeof(buf))
{
mlog("fatal error: length problem with compiling sql");
}
if((i = sqlite3_exec(rb_bandb, buf, (cb ? rsdb_callback_func : NULL), (void *)((uintptr_t)cb), &errmsg)))
{
switch (i)
{
case SQLITE_BUSY:
for(j = 0; j < 5; j++)
{
rb_sleep(0, 500000);
if(!sqlite3_exec
(rb_bandb, buf, (cb ? rsdb_callback_func : NULL), (void *)((uintptr_t)cb), &errmsg))
return;
}
/* failed, fall through to default */
mlog("fatal error: problem with db file: %s", errmsg);
break;
default:
mlog("fatal error: problem with db file: %s", errmsg);
break;
}
}
}
void
rsdb_exec_fetch(struct rsdb_table *table, const char *format, ...)
{
static char buf[BUFSIZE * 4];
va_list args;
char *errmsg;
char **data;
int pos;
unsigned int retval;
int i, j;
va_start(args, format);
retval = rs_vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
if(retval >= sizeof(buf))
{
mlog("fatal error: length problem with compiling sql");
}
if((retval =
sqlite3_get_table(rb_bandb, buf, &data, &table->row_count, &table->col_count, &errmsg)))
{
int success = 0;
switch (retval)
{
case SQLITE_BUSY:
for(i = 0; i < 5; i++)
{
rb_sleep(0, 500000);
if(!sqlite3_get_table
(rb_bandb, buf, &data, &table->row_count, &table->col_count,
&errmsg))
{
success++;
break;
}
}
if(success)
break;
mlog("fatal error: problem with db file: %s", errmsg);
break;
default:
mlog("fatal error: problem with db file: %s", errmsg);
break;
}
}
/* we need to be able to free data afterward */
table->arg = data;
if(table->row_count == 0)
{
table->row = NULL;
return;
}
/* sqlite puts the column names as the first row */
pos = table->col_count;
table->row = rb_malloc(sizeof(char **) * table->row_count);
for(i = 0; i < table->row_count; i++)
{
table->row[i] = rb_malloc(sizeof(char *) * table->col_count);
for(j = 0; j < table->col_count; j++)
{
table->row[i][j] = data[pos++];
}
}
}
void
rsdb_exec_fetch_end(struct rsdb_table *table)
{
int i;
for(i = 0; i < table->row_count; i++)
{
rb_free(table->row[i]);
}
rb_free(table->row);
sqlite3_free_table((char **)table->arg);
}
void
rsdb_transaction(rsdb_transtype type)
{
if(type == RSDB_TRANS_START)
rsdb_exec(NULL, "BEGIN TRANSACTION");
else if(type == RSDB_TRANS_END)
rsdb_exec(NULL, "COMMIT TRANSACTION");
}