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/* Copyright (c) 2021 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "dlua-script-private.h"
/*
* Adjust the index by the specified delta.
*
* In a couple of places we need to adjust the passed in index to reflect
* additional items pushed onto the stack. We cannot blindly adjust the
* index because the index could be one of three things and only one of them
* is supposed to be ajusted:
*
* 1. negative number: index relative to top of stack, adjust
* 2. positive number: absolute index, don't adjust
* 3. special registry index: don't adjust
*/
static inline int adj(int idx, int delta)
{
if ((idx == LUA_REGISTRYINDEX) || (idx > 0))
return idx;
else
return idx - delta;
}
/*
* Pushes onto the stack the value t[k], where t is the value at the given
* index and k is the value at the top of the stack. Unlike lua_gettable(),
* this function checks the type of the retreived value against the passed
* in type. [-1,+0..1,e]
*
* Return value:
* -1 = incompatible type
* 0 = nil or none
* 1 = found
*/
static int dlua_table_get(lua_State *L, int idx, int type)
{
/* can only work with tables */
if (!lua_istable(L, idx))
return -1;
lua_gettable(L, idx);
/* check if the field was there */
if (lua_isnoneornil(L, -1)) {
lua_pop(L, 1);
return 0;
}
/* check that the field is the expected type */
if (lua_type(L, -1) != type) {
lua_pop(L, 1);
return -1;
}
return 1;
}
/* Get by string name [-0,+1,e] */
int dlua_table_get_by_str(lua_State *L, int idx, int type, const char *field)
{
/* push the key */
lua_pushstring(L, field);
return dlua_table_get(L, adj(idx, 1), type);
}
/* Get by int name [-0,+1,e] */
int dlua_table_get_by_int(lua_State *L, int idx, int type, lua_Integer field)
{
/* push the key */
lua_pushinteger(L, field);
return dlua_table_get(L, adj(idx, 1), type);
}
/* Get by thread [-0,+1,e] */
int dlua_table_get_by_thread(lua_State *L, int idx, int type)
{
/* push the key */
lua_pushthread(L);
return dlua_table_get(L, adj(idx, 1), type);
}
/* generate a set of functions to access fields of an integral data type */
#define GET_INTTYPE(fxn, ctype, minval, maxval, unsigned_check) \
int fxn##_by_str(lua_State *L, int idx, const char *field, \
ctype *value_r) \
{ \
lua_Integer tmp; \
int ret; \
\
ret = dlua_table_get_luainteger_by_str(L, idx, field, &tmp); \
if (ret < 1) \
return ret; \
\
if (unsigned_check) { \
if ((tmp < 0) || (((uintmax_t) tmp) > (maxval))) \
return -1; \
} else { \
if ((tmp < (minval)) || (tmp > (intmax_t) (maxval))) \
return -1; \
} \
\
*value_r = (ctype) tmp; \
\
return 1; \
} \
int fxn##_by_int(lua_State *L, int idx, lua_Integer field, \
ctype *value_r) \
{ \
lua_Integer tmp; \
int ret; \
\
ret = dlua_table_get_luainteger_by_int(L, idx, field, &tmp); \
if (ret < 1) \
return ret; \
\
if (unsigned_check) { \
if ((tmp < 0) || (((uintmax_t) tmp) > (maxval))) \
return -1; \
} else { \
if ((tmp < (minval)) || (tmp > (intmax_t) (maxval))) \
return -1; \
} \
\
*value_r = (ctype) tmp; \
\
return 1; \
} \
int fxn##_by_thread(lua_State *L, int idx, ctype *value_r) \
{ \
lua_Integer tmp; \
int ret; \
\
ret = dlua_table_get_luainteger_by_thread(L, idx, &tmp); \
if (ret < 1) \
return ret; \
\
if (unsigned_check) { \
if ((tmp < 0) || (((uintmax_t) tmp) > (maxval))) \
return -1; \
} else { \
if ((tmp < (minval)) || (tmp > (intmax_t) (maxval))) \
return -1; \
} \
\
*value_r = (ctype) tmp; \
\
return 1; \
}
/* generate a set of functions to access fields of a binary data type */
#define GET_DATAPTR(fxn) \
int fxn##_by_str(lua_State *L, int idx, const char *field, \
const unsigned char **value_r, size_t *len_r) \
{ \
int ret; \
\
ret = dlua_table_get_by_str(L, idx, LUA_TSTRING, field); \
if (ret < 1) \
return ret; \
\
*value_r = (const unsigned char *) lua_tolstring(L, -1, len_r); \
lua_pop(L, 1); \
\
return 1; \
} \
int fxn##_by_int(lua_State *L, int idx, lua_Integer field, \
const unsigned char **value_r, size_t *len_r) \
{ \
int ret; \
\
ret = dlua_table_get_by_int(L, idx, LUA_TSTRING, field); \
if (ret < 1) \
return ret; \
\
*value_r = (const unsigned char *) lua_tolstring(L, -1, len_r); \
lua_pop(L, 1); \
\
return 1; \
} \
int fxn##_by_thread(lua_State *L, int idx, \
const unsigned char **value_r, size_t *len_r) \
{ \
int ret; \
\
ret = dlua_table_get_by_thread(L, idx, LUA_TSTRING); \
if (ret < 1) \
return ret; \
\
*value_r = (const unsigned char *) lua_tolstring(L, -1, len_r); \
lua_pop(L, 1); \
\
return 1; \
}
/* generate a set of functions to access fields of a generic-ish type */
#define GET_GENERIC(fxn, ctype, ltype, cvt) \
int fxn##_by_str(lua_State *L, int idx, const char *field, ctype *value_r)\
{ \
int ret; \
\
ret = dlua_table_get_by_str(L, idx, (ltype), field); \
if (ret < 1) \
return ret; \
\
*value_r = cvt(L, -1); \
lua_pop(L, 1); \
\
return 1; \
} \
int fxn##_by_int(lua_State *L, int idx, lua_Integer field, ctype *value_r)\
{ \
int ret; \
\
ret = dlua_table_get_by_int(L, idx, (ltype), field); \
if (ret < 1) \
return ret; \
\
*value_r = cvt(L, -1); \
lua_pop(L, 1); \
\
return 1; \
} \
int fxn##_by_thread(lua_State *L, int idx, ctype *value_r) \
{ \
int ret; \
\
ret = dlua_table_get_by_thread(L, idx, (ltype)); \
if (ret < 1) \
return ret; \
\
*value_r = cvt(L, -1); \
lua_pop(L, 1); \
\
return 1; \
}
GET_INTTYPE(dlua_table_get_int, int, INT_MIN, INT_MAX, FALSE);
GET_INTTYPE(dlua_table_get_intmax, intmax_t, INTMAX_MIN, INTMAX_MAX, FALSE);
GET_INTTYPE(dlua_table_get_uint, unsigned int, 0, UINT_MAX, TRUE);
GET_INTTYPE(dlua_table_get_uintmax, uintmax_t, 0, UINTMAX_MAX, TRUE);
/* we need to use lua_tointegerx which takes an extra argument */
int dlua_table_get_luainteger_by_str(lua_State *L, int idx, const char *field,
lua_Integer *value_r)
{
int isnum;
int ret;
ret = dlua_table_get_by_str(L, idx, LUA_TNUMBER, field);
if (ret < 1)
return ret;
*value_r = lua_tointegerx(L, -1, &isnum);
lua_pop(L, 1);
return (isnum == 1) ? 1 : -1;
}
/* we need to use lua_tointegerx which takes an extra argument */
int dlua_table_get_luainteger_by_int(lua_State *L, int idx, lua_Integer field,
lua_Integer *value_r)
{
int isnum;
int ret;
ret = dlua_table_get_by_int(L, idx, LUA_TNUMBER, field);
if (ret < 1)
return ret;
*value_r = lua_tointegerx(L, -1, &isnum);
lua_pop(L, 1);
return (isnum == 1) ? 1 : -1;
}
/* we need to use lua_tointegerx which takes an extra argument */
int dlua_table_get_luainteger_by_thread(lua_State *L, int idx,
lua_Integer *value_r)
{
int isnum;
int ret;
ret = dlua_table_get_by_thread(L, idx, LUA_TNUMBER);
if (ret < 1)
return ret;
*value_r = lua_tointegerx(L, -1, &isnum);
lua_pop(L, 1);
return (isnum == 1) ? 1 : -1;
}
GET_GENERIC(dlua_table_get_number, lua_Number, LUA_TNUMBER, lua_tonumber);
GET_GENERIC(dlua_table_get_bool, bool, LUA_TBOOLEAN, lua_toboolean);
GET_GENERIC(dlua_table_get_string, const char *, LUA_TSTRING, lua_tostring);
GET_DATAPTR(dlua_table_get_data);
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