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/* sqlite.c - SQLite helper functions.
* Copyright (C) 2015 g10 Code GmbH
*
* This file is part of GnuPG.
*
* GnuPG 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; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "gpg.h"
#include "util.h"
#include "logging.h"
#include "sqlite.h"
/* This is a convenience function that combines sqlite3_mprintf and
sqlite3_exec. */
int
sqlite3_exec_printf (sqlite3 *db,
int (*callback)(void*,int,char**,char**), void *cookie,
char **errmsg,
const char *sql, ...)
{
va_list ap;
int rc;
char *sql2;
va_start (ap, sql);
sql2 = sqlite3_vmprintf (sql, ap);
va_end (ap);
#if 0
log_debug ("tofo db: executing: '%s'\n", sql2);
#endif
rc = sqlite3_exec (db, sql2, callback, cookie, errmsg);
sqlite3_free (sql2);
return rc;
}
int
sqlite3_stepx (sqlite3 *db,
sqlite3_stmt **stmtp,
sqlite3_stepx_callback callback,
void *cookie,
char **errmsg,
const char *sql, ...)
{
int rc;
int err = 0;
sqlite3_stmt *stmt = NULL;
va_list va;
int args;
enum sqlite_arg_type t;
int i;
int cols;
/* Names of the columns. We initialize this lazily to avoid the
overhead in case the query doesn't return any results. */
const char **azColName = 0;
int callback_initialized = 0;
const char **azVals = 0;
callback_initialized = 0;
if (stmtp && *stmtp)
{
stmt = *stmtp;
/* Make sure this statement is associated with the supplied db. */
assert (db == sqlite3_db_handle (stmt));
#if DEBUG_TOFU_CACHE
prepares_saved ++;
#endif
}
else
{
const char *tail = NULL;
rc = sqlite3_prepare_v2 (db, sql, -1, &stmt, &tail);
if (rc)
log_fatal ("failed to prepare SQL: %s", sql);
/* We can only process a single statement. */
if (tail)
{
while (*tail == ' ' || *tail == ';' || *tail == '\n')
tail ++;
if (*tail)
log_fatal
("sqlite3_stepx can only process a single SQL statement."
" Second statement starts with: '%s'\n",
tail);
}
if (stmtp)
*stmtp = stmt;
}
#if DEBUG_TOFU_CACHE
queries ++;
#endif
args = sqlite3_bind_parameter_count (stmt);
va_start (va, sql);
if (args)
{
for (i = 1; i <= args; i ++)
{
t = va_arg (va, enum sqlite_arg_type);
switch (t)
{
case SQLITE_ARG_INT:
{
int value = va_arg (va, int);
err = sqlite3_bind_int (stmt, i, value);
break;
}
case SQLITE_ARG_LONG_LONG:
{
long long value = va_arg (va, long long);
err = sqlite3_bind_int64 (stmt, i, value);
break;
}
case SQLITE_ARG_STRING:
{
char *text = va_arg (va, char *);
err = sqlite3_bind_text (stmt, i, text, -1, SQLITE_STATIC);
break;
}
case SQLITE_ARG_BLOB:
{
char *blob = va_arg (va, void *);
long long length = va_arg (va, long long);
err = sqlite3_bind_blob (stmt, i, blob, length, SQLITE_STATIC);
break;
}
default:
/* Internal error. Likely corruption. */
log_fatal ("Bad value for parameter type %d.\n", t);
}
if (err)
{
log_fatal ("Error binding parameter %d\n", i);
goto out;
}
}
}
t = va_arg (va, enum sqlite_arg_type);
assert (t == SQLITE_ARG_END);
va_end (va);
for (;;)
{
rc = sqlite3_step (stmt);
if (rc != SQLITE_ROW)
/* No more data (SQLITE_DONE) or an error occurred. */
break;
if (! callback)
continue;
if (! callback_initialized)
{
cols = sqlite3_column_count (stmt);
azColName = xmalloc (2 * cols * sizeof (const char *) + 1);
for (i = 0; i < cols; i ++)
azColName[i] = sqlite3_column_name (stmt, i);
callback_initialized = 1;
}
azVals = &azColName[cols];
for (i = 0; i < cols; i ++)
{
azVals[i] = sqlite3_column_text (stmt, i);
if (! azVals[i] && sqlite3_column_type (stmt, i) != SQLITE_NULL)
/* Out of memory. */
{
err = SQLITE_NOMEM;
break;
}
}
if (callback (cookie, cols, (char **) azVals, (char **) azColName, stmt))
/* A non-zero result means to abort. */
{
err = SQLITE_ABORT;
break;
}
}
out:
xfree (azColName);
if (stmtp)
rc = sqlite3_reset (stmt);
else
rc = sqlite3_finalize (stmt);
if (rc == SQLITE_OK && err)
/* Local error. */
{
rc = err;
if (errmsg)
{
const char *e = sqlite3_errstr (err);
size_t l = strlen (e) + 1;
*errmsg = sqlite3_malloc (l);
if (! *errmsg)
log_fatal ("Out of memory.\n");
memcpy (*errmsg, e, l);
}
}
else if (rc != SQLITE_OK && errmsg)
/* Error reported by sqlite. */
{
const char * e = sqlite3_errmsg (db);
size_t l = strlen (e) + 1;
*errmsg = sqlite3_malloc (l);
if (! *errmsg)
log_fatal ("Out of memory.\n");
memcpy (*errmsg, e, l);
}
return rc;
}
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