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/*
* nanobbs, a tiny forums software.
* Copyright (C) 2025-2026 Xavier Del Campo Romero
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#define _POSIX_C_SOURCE 200809L
#include "db.h"
#include "defs.h"
#include <dynstr.h>
#include <sqlite3.h>
#include <sys/stat.h>
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int column(sqlite3 *const db, sqlite3_stmt *const stmt,
const char *const name)
{
const int n = sqlite3_data_count(stmt);
if (!n)
{
fprintf(stderr, "%s: sqlite3_data_count: %s\n", __func__,
sqlite3_errmsg(db));
return -1;
}
for (int i = 0; i < n; i++)
{
const char *const col = sqlite3_column_name(stmt, i);
if (!col)
{
fprintf(stderr, "%s: sqlite3_column_name: %s\n", __func__,
sqlite3_errmsg(db));
return -1;
}
else if (!strcmp(col, name))
return i;
}
fprintf(stderr, "%s: could not find column \"%s\"\n", __func__, name);
return -1;
}
int db_int(sqlite3 *const db, sqlite3_stmt *const stmt, const char *const name,
int *const out)
{
const int col = column(db, stmt, name);
if (col < 0)
return -1;
*out = sqlite3_column_int(stmt, col);
return 0;
}
int db_uint(sqlite3 *const db, sqlite3_stmt *const stmt, const char *const name,
unsigned *const out)
{
int v;
if (db_int(db, stmt, name, &v))
return -1;
else if (v < 0)
{
fprintf(stderr, "%s: unexpected negative value for %s: %d\n", __func__,
name, v);
return -1;
}
*out = v;
return 0;
}
int db_bigint(sqlite3 *const db, sqlite3_stmt *const stmt,
const char *const name, long long *const out)
{
const int col = column(db, stmt, name);
if (col < 0)
return -1;
*out = sqlite3_column_int64(stmt, col);
return 0;
}
int db_biguint(sqlite3 *const db, sqlite3_stmt *const stmt,
const char *const name, unsigned long long *const out)
{
const int col = column(db, stmt, name);
sqlite3_int64 v;
if (col < 0 || (v = sqlite3_column_int64(stmt, col)) < 0)
return -1;
*out = v;
return 0;
}
char *db_str(sqlite3 *const db, sqlite3_stmt *const stmt,
const char *const name)
{
char *ret = NULL;
const int col = column(db, stmt, name);
if (col < 0)
return NULL;
const unsigned char *const s = sqlite3_column_text(stmt, col);
if (!s)
{
fprintf(stderr, "%s: sqlite3_column_text: %s\n", __func__,
sqlite3_errmsg(db));
goto failure;
}
else if (!(ret = strndup((const char *)s, sqlite3_column_bytes(stmt, col))))
{
fprintf(stderr, "%s: strndup(3): %s\n", __func__, strerror(errno));
goto failure;
}
return ret;
failure:
free(ret);
return NULL;
}
int db_rollback(sqlite3 *const db)
{
char *msg = NULL;
const int e = sqlite3_exec(db, "ROLLBACK;", NULL, NULL, &msg);
if (e != SQLITE_OK)
fprintf(stderr, "%s: sqlite3_exec: %s, msg=%s\n", __func__,
sqlite3_errstr(e), msg);
sqlite3_free(msg);
return e != SQLITE_OK;
}
int db_open(const char *const dir, sqlite3 **const out)
{
int ret = SQLITE_ERROR;
sqlite3 *db;
struct dynstr d;
const mode_t m = umask(S_IWGRP | S_IWOTH | S_IROTH);
dynstr_init(&d);
if (dynstr_append(&d, "%s/" PROJECT_NAME ".db", dir))
{
fprintf(stderr, "%s: dynstr_append failed\n", __func__);
goto end;
}
else if ((ret = sqlite3_open(d.str, &db)) != SQLITE_OK)
{
fprintf(stderr, "%s: sqlite3_open %s: %s\n", __func__, d.str,
sqlite3_errstr(ret));
goto end;
}
*out = db;
ret = 0;
end:
umask(m);
dynstr_free(&d);
return ret;
}
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