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/*
See license.txt in the root of this project.
*/
# include "luametatex.h"
# include "lmtoptional.h"
typedef void mysql_instance;
typedef void mysql_result;
typedef char **mysql_row;
typedef unsigned int mysql_offset;
typedef struct mysql_field {
char *name;
char *org_name;
char *table;
char *org_table;
char *db;
char *catalog;
char *def;
unsigned long length;
unsigned long max_length;
unsigned int name_length;
unsigned int org_name_length;
unsigned int table_length;
unsigned int org_table_length;
unsigned int db_length;
unsigned int catalog_length;
unsigned int def_length;
unsigned int flags;
unsigned int decimals;
unsigned int charsetnr;
int type;
void *extension;
} mysql_field;
# define MYSQLLIB_METATABLE "luatex.mysqllib"
typedef struct mysqllib_data {
/*tex There is not much more than a pointer currently. */
mysql_instance * db;
} mysqllib_data ;
typedef struct mysqllib_state_info {
int initialized;
int padding;
mysql_instance * (*mysql_init) (
mysql_instance *mysql
);
mysql_instance * (*mysql_real_connect) (
mysql_instance *mysql,
const char *host,
const char *user,
const char *passwd,
const char *db,
unsigned int port,
const char *unix_socket,
unsigned long clientflag
);
unsigned int (*mysql_errno) (
mysql_instance *mysql
);
const char * (*mysql_error) (
mysql_instance *mysql
);
int (*mysql_real_query) (
mysql_instance *mysql,
const char *q,
unsigned long length
);
mysql_result * (*mysql_store_result) (
mysql_instance *mysql
);
void (*mysql_free_result) (
mysql_result *result
);
unsigned long long (*mysql_num_rows) (
mysql_result *res
);
mysql_row (*mysql_fetch_row) (
mysql_result *result
);
unsigned int (*mysql_affected_rows) (
mysql_instance *mysql
);
unsigned int (*mysql_field_count) (
mysql_instance *mysql
);
unsigned int (*mysql_num_fields) (
mysql_result *res
);
mysql_field * (*mysql_fetch_fields) (
mysql_result *res
);
mysql_offset (*mysql_field_seek) (
mysql_result *result,
mysql_offset offset
);
void (*mysql_close) (
mysql_instance *sock
);
} mysqllib_state_info;
static mysqllib_state_info mysqllib_state = {
.initialized = 0,
.padding = 0,
.mysql_init = NULL,
.mysql_real_connect = NULL,
.mysql_errno = NULL,
.mysql_error = NULL,
.mysql_real_query = NULL,
.mysql_store_result = NULL,
.mysql_free_result = NULL,
.mysql_num_rows = NULL,
.mysql_fetch_row = NULL,
.mysql_affected_rows = NULL,
.mysql_field_count = NULL,
.mysql_num_fields = NULL,
.mysql_fetch_fields = NULL,
.mysql_field_seek = NULL,
.mysql_close = NULL,
};
static int mysqllib_initialize(lua_State * L)
{
if (! mysqllib_state.initialized) {
const char *filename = lua_tostring(L, 1);
if (filename != NULL) {
lmt_library lib = lmt_library_load(filename);
mysqllib_state.mysql_init = lmt_library_find(lib, "mysql_init" );
mysqllib_state.mysql_real_connect = lmt_library_find(lib, "mysql_real_connect" );
mysqllib_state.mysql_errno = lmt_library_find(lib, "mysql_errno" );
mysqllib_state.mysql_error = lmt_library_find(lib, "mysql_error" );
mysqllib_state.mysql_real_query = lmt_library_find(lib, "mysql_real_query" );
mysqllib_state.mysql_store_result = lmt_library_find(lib, "mysql_store_result" );
mysqllib_state.mysql_free_result = lmt_library_find(lib, "mysql_free_result" );
mysqllib_state.mysql_num_rows = lmt_library_find(lib, "mysql_num_rows" );
mysqllib_state.mysql_fetch_row = lmt_library_find(lib, "mysql_fetch_row" );
mysqllib_state.mysql_affected_rows = lmt_library_find(lib, "mysql_affected_rows" );
mysqllib_state.mysql_field_count = lmt_library_find(lib, "mysql_field_count" );
mysqllib_state.mysql_num_fields = lmt_library_find(lib, "mysql_num_fields" );
mysqllib_state.mysql_fetch_fields = lmt_library_find(lib, "mysql_fetch_fields" );
mysqllib_state.mysql_field_seek = lmt_library_find(lib, "mysql_field_seek" );
mysqllib_state.mysql_close = lmt_library_find(lib, "mysql_close" );
mysqllib_state.initialized = lmt_library_okay(lib);
}
}
lua_pushboolean(L, mysqllib_state.initialized);
return 1;
}
static int mysqllib_open(lua_State * L)
{
if (mysqllib_state.initialized) {
const char * database = luaL_checkstring(L, 1);
const char * username = luaL_optstring(L, 2, NULL);
const char * password = luaL_optstring(L, 3, NULL);
const char * host = luaL_optstring(L, 4, NULL);
int port = lmt_optinteger(L, 5, 0);
const char * socket = NULL; /* luaL_optstring(L, 6, NULL); */
int flag = 0; /* luaL_optinteger(L, 7, 0); */
mysql_instance * db = mysqllib_state.mysql_init(NULL);
if (db != NULL) {
if (mysqllib_state.mysql_real_connect(db, host, username, password, database, port, socket, flag)) {
mysqllib_data *data = lua_newuserdatauv(L, sizeof(data), 0);
data->db = db ;
luaL_getmetatable(L, MYSQLLIB_METATABLE);
lua_setmetatable(L, -2);
return 1;
} else {
mysqllib_state.mysql_close(db);
}
}
}
return 0;
}
static int mysqllib_close(lua_State * L)
{
if (mysqllib_state.initialized) {
mysqllib_data * data = luaL_checkudata(L, 1, MYSQLLIB_METATABLE);
if (data != NULL) {
mysqllib_state.mysql_close(data->db);
data->db = NULL;
}
}
return 0;
}
/* execute(database,querystring,callback) : callback(nofcolumns,values,fields) */
static int mysqllib_execute(lua_State * L)
{
if (mysqllib_state.initialized) {
mysqllib_data * data = luaL_checkudata(L, 1, MYSQLLIB_METATABLE);
if (data != NULL) {
size_t length = 0;
const char *query = lua_tolstring(L, 2, &length);
if (query != NULL) {
int error = mysqllib_state.mysql_real_query(data->db, query, (int) length);
if (!error) {
mysql_result * result = mysqllib_state.mysql_store_result(data->db);
if (result != NULL) {
int nofrows = 0;
int nofcolumns = 0;
mysqllib_state.mysql_field_seek(result, 0);
nofrows = (int) mysqllib_state.mysql_num_rows(result);
nofcolumns = mysqllib_state.mysql_num_fields(result);
/* This is similar to sqlite but there the callback is more indirect. */
if (nofcolumns > 0 && nofrows > 0) {
for (int r = 0; r < nofrows; r++) {
mysql_row row = mysqllib_state.mysql_fetch_row(result);
lua_pushvalue(L, -1);
lua_pushinteger(L, nofcolumns);
lua_createtable(L, nofcolumns, 0);
for (int c = 0; c < nofcolumns; c++) {
lua_pushstring(L, row[c]);
lua_rawseti(L, -2, (lua_Integer)c + 1);
}
if (r) {
lua_call(L, 2, 0);
} else {
mysql_field * fields = mysqllib_state.mysql_fetch_fields(result);
lua_createtable(L, nofcolumns, 0);
for (int c = 0; c < nofcolumns; c++) {
lua_pushstring(L, fields[c].name);
lua_rawseti(L, -2, (lua_Integer)c + 1);
}
lua_call(L, 3, 0);
}
}
}
mysqllib_state.mysql_free_result(result);
}
lua_pushboolean(L, 1);
return 1;
}
}
}
}
lua_pushboolean(L, 0);
return 1;
}
static int mysqllib_getmessage(lua_State * L)
{
if (mysqllib_state.initialized) {
mysqllib_data * data = luaL_checkudata(L, 1, MYSQLLIB_METATABLE);
if (data != NULL) {
lua_pushstring(L, mysqllib_state.mysql_error(data->db));
return 1;
}
}
return 0;
}
/* private */
static int mysqllib_free(lua_State * L)
{
return mysqllib_close(L);
}
/* <string> = tostring(instance) */
static int mysqllib_tostring(lua_State * L)
{
if (mysqllib_state.initialized) {
mysqllib_data * data = luaL_checkudata(L, 1, MYSQLLIB_METATABLE);
if (data != NULL) {
(void) lua_pushfstring(L, "<mysqllib-instance %p>", data);
} else {
lua_pushnil(L);
}
return 1;
} else {
return 0;
}
}
static const struct luaL_Reg mysqllib_metatable[] = {
{ "__tostring", mysqllib_tostring },
{ "__gc", mysqllib_free },
{ NULL, NULL },
};
static struct luaL_Reg mysqllib_function_list[] = {
{ "initialize", mysqllib_initialize },
{ "open", mysqllib_open },
{ "close", mysqllib_close },
{ "execute", mysqllib_execute },
{ "getmessage", mysqllib_getmessage },
{ NULL, NULL },
};
int luaopen_mysql(lua_State * L)
{
luaL_newmetatable(L, MYSQLLIB_METATABLE);
luaL_setfuncs(L, mysqllib_metatable, 0);
lmt_library_register(L, "mysql", mysqllib_function_list);
return 0;
}
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