/*

** $Id: lbaselib.c $

** Basic library

** See Copyright Notice in lua.h

*/

#define lbaselib_c

#define LUA_LIB

#include "lprefix.h"

#include <ctype.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "lua.h"

#include "lauxlib.h"

#include "lualib.h"

#include "llimits.h"

static int luaB_print (lua_State *L) {

int n = lua_gettop(L); /* number of arguments */

int i;

for (i = 1; i <= n; i++) { /* for each argument */

size_t l;

const char *s = luaL_tolstring(L, i, &l); /* convert it to string */

if (i > 1) /* not the first element? */

lua_writestring("\t", 1); /* add a tab before it */

lua_writestring(s, l); /* print it */

lua_pop(L, 1); /* pop result */

}

lua_writeline();

return 0;

}

/*

** Creates a warning with all given arguments.

** Check first for errors; otherwise an error may interrupt

** the composition of a warning, leaving it unfinished.

*/

static int luaB_warn (lua_State *L) {

int n = lua_gettop(L); /* number of arguments */

int i;

luaL_checkstring(L, 1); /* at least one argument */

for (i = 2; i <= n; i++)

luaL_checkstring(L, i); /* make sure all arguments are strings */

for (i = 1; i < n; i++) /* compose warning */

lua_warning(L, lua_tostring(L, i), 1);

lua_warning(L, lua_tostring(L, n), 0); /* close warning */

return 0;

}

#define SPACECHARS " \f\n\r\t\v"

static const char *b_str2int (const char *s, unsigned base, lua_Integer *pn) {

lua_Unsigned n = 0;

int neg = 0;

s += strspn(s, SPACECHARS); /* skip initial spaces */

if (*s == '-') { s++; neg = 1; } /* handle sign */

else if (*s == '+') s++;

if (!isalnum(cast_uchar(*s))) /* no digit? */

return NULL;

do {

unsigned digit = cast_uint(isdigit(cast_uchar(*s))

? *s - '0'

: (toupper(cast_uchar(*s)) - 'A') + 10);

if (digit >= base) return NULL; /* invalid numeral */

n = n * base + digit;

s++;

} while (isalnum(cast_uchar(*s)));

s += strspn(s, SPACECHARS); /* skip trailing spaces */

*pn = (lua_Integer)((neg) ? (0u - n) : n);

return s;

}

static int luaB_tonumber (lua_State *L) {

if (lua_isnoneornil(L, 2)) { /* standard conversion? */

if (lua_type(L, 1) == LUA_TNUMBER) { /* already a number? */

lua_settop(L, 1); /* yes; return it */

return 1;

}

else {

size_t l;

const char *s = lua_tolstring(L, 1, &l);

if (s != NULL && lua_stringtonumber(L, s) == l + 1)

return 1; /* successful conversion to number */

/* else not a number */

luaL_checkany(L, 1); /* (but there must be some parameter) */

}

}

else {

size_t l;

const char *s;

lua_Integer n = 0; /* to avoid warnings */

lua_Integer base = luaL_checkinteger(L, 2);

luaL_checktype(L, 1, LUA_TSTRING); /* no numbers as strings */

s = lua_tolstring(L, 1, &l);

luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");

if (b_str2int(s, cast_uint(base), &n) == s + l) {

lua_pushinteger(L, n);

return 1;

} /* else not a number */

} /* else not a number */

luaL_pushfail(L); /* not a number */

return 1;

}

static int luaB_error (lua_State *L) {

int level = (int)luaL_optinteger(L, 2, 1);

lua_settop(L, 1);

if (lua_type(L, 1) == LUA_TSTRING && level > 0) {

luaL_where(L, level); /* add extra information */

lua_pushvalue(L, 1);

lua_concat(L, 2);

}

return lua_error(L);

}

static int luaB_getmetatable (lua_State *L) {

luaL_checkany(L, 1);

if (!lua_getmetatable(L, 1)) {

lua_pushnil(L);

return 1; /* no metatable */

}

luaL_getmetafield(L, 1, "__metatable");

return 1; /* returns either __metatable field (if present) or metatable */

}

static int luaB_setmetatable (lua_State *L) {

int t = lua_type(L, 2);

luaL_checktype(L, 1, LUA_TTABLE);

luaL_argexpected(L, t == LUA_TNIL || t == LUA_TTABLE, 2, "nil or table");

if (l_unlikely(luaL_getmetafield(L, 1, "__metatable") != LUA_TNIL))

return luaL_error(L, "cannot change a protected metatable");

lua_settop(L, 2);

lua_setmetatable(L, 1);

return 1;

}

static int luaB_rawequal (lua_State *L) {

luaL_checkany(L, 1);

luaL_checkany(L, 2);

lua_pushboolean(L, lua_rawequal(L, 1, 2));

return 1;

}

static int luaB_rawlen (lua_State *L) {

int t = lua_type(L, 1);

luaL_argexpected(L, t == LUA_TTABLE || t == LUA_TSTRING, 1,

"table or string");

lua_pushinteger(L, l_castU2S(lua_rawlen(L, 1)));

return 1;

}

static int luaB_rawget (lua_State *L) {

luaL_checktype(L, 1, LUA_TTABLE);

luaL_checkany(L, 2);

lua_settop(L, 2);

lua_rawget(L, 1);

return 1;

}

static int luaB_rawset (lua_State *L) {

luaL_checktype(L, 1, LUA_TTABLE);

luaL_checkany(L, 2);

luaL_checkany(L, 3);

lua_settop(L, 3);

lua_rawset(L, 1);

return 1;

}

static int pushmode (lua_State *L, int oldmode) {

if (oldmode == -1)

luaL_pushfail(L); /* invalid call to 'lua_gc' */

else

lua_pushstring(L, (oldmode == LUA_GCINC) ? "incremental"

: "generational");

return 1;

}

/*

** check whether call to 'lua_gc' was valid (not inside a finalizer)

*/

#define checkvalres(res) { if (res == -1) break; }

static int luaB_collectgarbage (lua_State *L) {

static const char *const opts[] = {"stop", "restart", "collect",

"count", "step", "isrunning", "generational", "incremental",

"param", NULL};

static const char optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,

LUA_GCCOUNT, LUA_GCSTEP, LUA_GCISRUNNING, LUA_GCGEN, LUA_GCINC,

LUA_GCPARAM};

int o = optsnum[luaL_checkoption(L, 1, "collect", opts)];

switch (o) {

case LUA_GCCOUNT: {

int k = lua_gc(L, o);

int b = lua_gc(L, LUA_GCCOUNTB);

checkvalres(k);

lua_pushnumber(L, (lua_Number)k + ((lua_Number)b/1024));

return 1;

}

case LUA_GCSTEP: {

lua_Integer n = luaL_optinteger(L, 2, 0);

int res = lua_gc(L, o, cast_sizet(n));

checkvalres(res);

lua_pushboolean(L, res);

return 1;

}

case LUA_GCISRUNNING: {

int res = lua_gc(L, o);

checkvalres(res);

lua_pushboolean(L, res);

return 1;

}

case LUA_GCGEN: {

return pushmode(L, lua_gc(L, o));

}

case LUA_GCINC: {

return pushmode(L, lua_gc(L, o));

}

case LUA_GCPARAM: {

static const char *const params[] = {

"minormul", "majorminor", "minormajor",

"pause", "stepmul", "stepsize", NULL};

static const char pnum[] = {

LUA_GCPMINORMUL, LUA_GCPMAJORMINOR, LUA_GCPMINORMAJOR,

LUA_GCPPAUSE, LUA_GCPSTEPMUL, LUA_GCPSTEPSIZE};

int p = pnum[luaL_checkoption(L, 2, NULL, params)];

lua_Integer value = luaL_optinteger(L, 3, -1);

lua_pushinteger(L, lua_gc(L, o, p, (int)value));

return 1;

}

default: {

int res = lua_gc(L, o);

checkvalres(res);

lua_pushinteger(L, res);

return 1;

}

}

luaL_pushfail(L); /* invalid call (inside a finalizer) */

return 1;

}

static int luaB_type (lua_State *L) {

int t = lua_type(L, 1);

luaL_argcheck(L, t != LUA_TNONE, 1, "value expected");

lua_pushstring(L, lua_typename(L, t));

return 1;

}

static int luaB_next (lua_State *L) {

luaL_checktype(L, 1, LUA_TTABLE);

lua_settop(L, 2); /* create a 2nd argument if there isn't one */

if (lua_next(L, 1))

return 2;

else {

lua_pushnil(L);

return 1;

}

}

static int pairscont (lua_State *L, int status, lua_KContext k) {

(void)L; (void)status; (void)k; /* unused */

return 3;

}

static int luaB_pairs (lua_State *L) {

luaL_checkany(L, 1);

if (luaL_getmetafield(L, 1, "__pairs") == LUA_TNIL) { /* no metamethod? */

lua_pushcfunction(L, luaB_next); /* will return generator, */

lua_pushvalue(L, 1); /* state, */

lua_pushnil(L); /* and initial value */

}

else {

lua_pushvalue(L, 1); /* argument 'self' to metamethod */

lua_callk(L, 1, 3, 0, pairscont); /* get 3 values from metamethod */

}

return 3;

}

/*

** Traversal function for 'ipairs'

*/

static int ipairsaux (lua_State *L) {

lua_Integer i = luaL_checkinteger(L, 2);

i = luaL_intop(+, i, 1);

lua_pushinteger(L, i);

return (lua_geti(L, 1, i) == LUA_TNIL) ? 1 : 2;

}

/*

** 'ipairs' function. Returns 'ipairsaux', given "table", 0.

** (The given "table" may not be a table.)

*/

static int luaB_ipairs (lua_State *L) {

luaL_checkany(L, 1);

lua_pushcfunction(L, ipairsaux); /* iteration function */

lua_pushvalue(L, 1); /* state */

lua_pushinteger(L, 0); /* initial value */

return 3;

}

static int load_aux (lua_State *L, int status, int envidx) {

if (l_likely(status == LUA_OK)) {

if (envidx != 0) { /* 'env' parameter? */

lua_pushvalue(L, envidx); /* environment for loaded function */

if (!lua_setupvalue(L, -2, 1)) /* set it as 1st upvalue */

lua_pop(L, 1); /* remove 'env' if not used by previous call */

}

return 1;

}

else { /* error (message is on top of the stack) */

luaL_pushfail(L);

lua_insert(L, -2); /* put before error message */

return 2; /* return fail plus error message */

}

}

static const char *getMode (lua_State *L, int idx) {

const char *mode = luaL_optstring(L, idx, "bt");

if (strchr(mode, 'B') != NULL) /* Lua code cannot use fixed buffers */

luaL_argerror(L, idx, "invalid mode");

return mode;

}

static int luaB_loadfile (lua_State *L) {

const char *fname = luaL_optstring(L, 1, NULL);

const char *mode = getMode(L, 2);

int env = (!lua_isnone(L, 3) ? 3 : 0); /* 'env' index or 0 if no 'env' */

int status = luaL_loadfilex(L, fname, mode);

return load_aux(L, status, env);

}

/*

** {======================================================

** Generic Read function

** =======================================================

*/

/*

** reserved slot, above all arguments, to hold a copy of the returned

** string to avoid it being collected while parsed. 'load' has four

** optional arguments (chunk, source name, mode, and environment).

*/

#define RESERVEDSLOT 5

/*

** Reader for generic 'load' function: 'lua_load' uses the

** stack for internal stuff, so the reader cannot change the

** stack top. Instead, it keeps its resulting string in a

** reserved slot inside the stack.

*/

static const char *generic_reader (lua_State *L, void *ud, size_t *size) {

(void)(ud); /* not used */

luaL_checkstack(L, 2, "too many nested functions");

lua_pushvalue(L, 1); /* get function */

lua_call(L, 0, 1); /* call it */

if (lua_isnil(L, -1)) {

lua_pop(L, 1); /* pop result */

*size = 0;

return NULL;

}

else if (l_unlikely(!lua_isstring(L, -1)))

luaL_error(L, "reader function must return a string");

lua_replace(L, RESERVEDSLOT); /* save string in reserved slot */

return lua_tolstring(L, RESERVEDSLOT, size);

}

static int luaB_load (lua_State *L) {

int status;

size_t l;

const char *s = lua_tolstring(L, 1, &l);

const char *mode = getMode(L, 3);

int env = (!lua_isnone(L, 4) ? 4 : 0); /* 'env' index or 0 if no 'env' */

if (s != NULL) { /* loading a string? */

const char *chunkname = luaL_optstring(L, 2, s);

status = luaL_loadbufferx(L, s, l, chunkname, mode);

}

else { /* loading from a reader function */

const char *chunkname = luaL_optstring(L, 2, "=(load)");

luaL_checktype(L, 1, LUA_TFUNCTION);

lua_settop(L, RESERVEDSLOT); /* create reserved slot */

status = lua_load(L, generic_reader, NULL, chunkname, mode);

}

return load_aux(L, status, env);

}

/* }====================================================== */

static int dofilecont (lua_State *L, int d1, lua_KContext d2) {

(void)d1; (void)d2; /* only to match 'lua_Kfunction' prototype */

return lua_gettop(L) - 1;

}

static int luaB_dofile (lua_State *L) {

const char *fname = luaL_optstring(L, 1, NULL);

lua_settop(L, 1);

if (l_unlikely(luaL_loadfile(L, fname) != LUA_OK))

return lua_error(L);

lua_callk(L, 0, LUA_MULTRET, 0, dofilecont);

return dofilecont(L, 0, 0);

}

static int luaB_assert (lua_State *L) {

if (l_likely(lua_toboolean(L, 1))) /* condition is true? */

return lua_gettop(L); /* return all arguments */

else { /* error */

luaL_checkany(L, 1); /* there must be a condition */

lua_remove(L, 1); /* remove it */

lua_pushliteral(L, "assertion failed!"); /* default message */

lua_settop(L, 1); /* leave only message (default if no other one) */

return luaB_error(L); /* call 'error' */

}

}

static int luaB_select (lua_State *L) {

int n = lua_gettop(L);

if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {

lua_pushinteger(L, n-1);

return 1;

}

else {

lua_Integer i = luaL_checkinteger(L, 1);

if (i < 0) i = n + i;

else if (i > n) i = n;

luaL_argcheck(L, 1 <= i, 1, "index out of range");

return n - (int)i;

}

}

/*

** Continuation function for 'pcall' and 'xpcall'. Both functions

** already pushed a 'true' before doing the call, so in case of success

** 'finishpcall' only has to return everything in the stack minus

** 'extra' values (where 'extra' is exactly the number of items to be

** ignored).

*/

static int finishpcall (lua_State *L, int status, lua_KContext extra) {

if (l_unlikely(status != LUA_OK && status != LUA_YIELD)) { /* error? */

lua_pushboolean(L, 0); /* first result (false) */

lua_pushvalue(L, -2); /* error message */

return 2; /* return false, msg */

}

else

return lua_gettop(L) - (int)extra; /* return all results */

}

static int luaB_pcall (lua_State *L) {

int status;

luaL_checkany(L, 1);

lua_pushboolean(L, 1); /* first result if no errors */

lua_insert(L, 1); /* put it in place */

status = lua_pcallk(L, lua_gettop(L) - 2, LUA_MULTRET, 0, 0, finishpcall);

return finishpcall(L, status, 0);

}

/*

** Do a protected call with error handling. After 'lua_rotate', the

** stack will have <f, err, true, f, [args...]>; so, the function passes

** 2 to 'finishpcall' to skip the 2 first values when returning results.

*/

static int luaB_xpcall (lua_State *L) {

int status;

int n = lua_gettop(L);

luaL_checktype(L, 2, LUA_TFUNCTION); /* check error function */

lua_pushboolean(L, 1); /* first result */

lua_pushvalue(L, 1); /* function */

lua_rotate(L, 3, 2); /* move them below function's arguments */

status = lua_pcallk(L, n - 2, LUA_MULTRET, 2, 2, finishpcall);

return finishpcall(L, status, 2);

}

static int luaB_tostring (lua_State *L) {

luaL_checkany(L, 1);

luaL_tolstring(L, 1, NULL);

return 1;

}

static const luaL_Reg base_funcs[] = {

{"assert", luaB_assert},

{"collectgarbage", luaB_collectgarbage},

{"dofile", luaB_dofile},

{"error", luaB_error},

{"getmetatable", luaB_getmetatable},

{"ipairs", luaB_ipairs},

{"loadfile", luaB_loadfile},

{"load", luaB_load},

{"next", luaB_next},

{"pairs", luaB_pairs},

{"pcall", luaB_pcall},

{"print", luaB_print},

{"warn", luaB_warn},

{"rawequal", luaB_rawequal},

{"rawlen", luaB_rawlen},

{"rawget", luaB_rawget},

{"rawset", luaB_rawset},

{"select", luaB_select},

{"setmetatable", luaB_setmetatable},

{"tonumber", luaB_tonumber},

{"tostring", luaB_tostring},

{"type", luaB_type},

{"xpcall", luaB_xpcall},

/* placeholders */

{LUA_GNAME, NULL},

{"_VERSION", NULL},

{NULL, NULL}

};

LUAMOD_API int luaopen_base (lua_State *L) {

/* open lib into global table */

lua_pushglobaltable(L);

luaL_setfuncs(L, base_funcs, 0);

/* set global _G */

lua_pushvalue(L, -1);

lua_setfield(L, -2, LUA_GNAME);

/* set global _VERSION */

lua_pushliteral(L, LUA_VERSION);

lua_setfield(L, -2, "_VERSION");

return 1;

}