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-rw-r--r--apps/plugins/lua/lauxlib.c974
1 files changed, 647 insertions, 327 deletions
diff --git a/apps/plugins/lua/lauxlib.c b/apps/plugins/lua/lauxlib.c
index b8020b7475..f451fb7c9e 100644
--- a/apps/plugins/lua/lauxlib.c
+++ b/apps/plugins/lua/lauxlib.c
@@ -1,11 +1,10 @@
/*
-** $Id: lauxlib.c,v 1.159.1.3 2008/01/21 13:20:51 roberto Exp $
+** $Id: lauxlib.c,v 1.248.1.1 2013/04/12 18:48:47 roberto Exp $
** Auxiliary functions for building Lua libraries
** See Copyright Notice in lua.h
*/
-#include <ctype.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
@@ -23,14 +22,127 @@
#include "lua.h"
#include "lauxlib.h"
+#include "rocklibc.h"
-#define FREELIST_REF 0 /* free list of references */
+/*
+** {======================================================
+** Traceback
+** =======================================================
+*/
+
+
+#define LEVELS1 12 /* size of the first part of the stack */
+#define LEVELS2 10 /* size of the second part of the stack */
+
+
+
+/*
+** search for 'objidx' in table at index -1.
+** return 1 + string at top if find a good name.
+*/
+static int findfield (lua_State *L, int objidx, int level) {
+ if (level == 0 || !lua_istable(L, -1))
+ return 0; /* not found */
+ lua_pushnil(L); /* start 'next' loop */
+ while (lua_next(L, -2)) { /* for each pair in table */
+ if (lua_type(L, -2) == LUA_TSTRING) { /* ignore non-string keys */
+ if (lua_rawequal(L, objidx, -1)) { /* found object? */
+ lua_pop(L, 1); /* remove value (but keep name) */
+ return 1;
+ }
+ else if (findfield(L, objidx, level - 1)) { /* try recursively */
+ lua_remove(L, -2); /* remove table (but keep name) */
+ lua_pushliteral(L, ".");
+ lua_insert(L, -2); /* place '.' between the two names */
+ lua_concat(L, 3);
+ return 1;
+ }
+ }
+ lua_pop(L, 1); /* remove value */
+ }
+ return 0; /* not found */
+}
+
+
+static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
+ int top = lua_gettop(L);
+ lua_getinfo(L, "f", ar); /* push function */
+ lua_pushglobaltable(L);
+ if (findfield(L, top + 1, 2)) {
+ lua_copy(L, -1, top + 1); /* move name to proper place */
+ lua_pop(L, 2); /* remove pushed values */
+ return 1;
+ }
+ else {
+ lua_settop(L, top); /* remove function and global table */
+ return 0;
+ }
+}
+
+
+static void pushfuncname (lua_State *L, lua_Debug *ar) {
+ if (*ar->namewhat != '\0') /* is there a name? */
+ lua_pushfstring(L, "function " LUA_QS, ar->name);
+ else if (*ar->what == 'm') /* main? */
+ lua_pushliteral(L, "main chunk");
+ else if (*ar->what == 'C') {
+ if (pushglobalfuncname(L, ar)) {
+ lua_pushfstring(L, "function " LUA_QS, lua_tostring(L, -1));
+ lua_remove(L, -2); /* remove name */
+ }
+ else
+ lua_pushliteral(L, "?");
+ }
+ else
+ lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);
+}
-/* convert a stack index to positive */
-#define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
- lua_gettop(L) + (i) + 1)
+static int countlevels (lua_State *L) {
+ lua_Debug ar;
+ int li = 1, le = 1;
+ /* find an upper bound */
+ while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }
+ /* do a binary search */
+ while (li < le) {
+ int m = (li + le)/2;
+ if (lua_getstack(L, m, &ar)) li = m + 1;
+ else le = m;
+ }
+ return le - 1;
+}
+
+
+LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,
+ const char *msg, int level) {
+ lua_Debug ar;
+ int top = lua_gettop(L);
+ int numlevels = countlevels(L1);
+ int mark = (numlevels > LEVELS1 + LEVELS2) ? LEVELS1 : 0;
+ if (msg) lua_pushfstring(L, "%s\n", msg);
+ lua_pushliteral(L, "stack traceback:");
+ while (lua_getstack(L1, level++, &ar)) {
+ if (level == mark) { /* too many levels? */
+ lua_pushliteral(L, "\n\t..."); /* add a '...' */
+ level = numlevels - LEVELS2; /* and skip to last ones */
+ }
+ else {
+ lua_getinfo(L1, "Slnt", &ar);
+ lua_pushfstring(L, "\n\t%s:", ar.short_src);
+ if (ar.currentline > 0)
+ lua_pushfstring(L, "%d:", ar.currentline);
+ lua_pushliteral(L, " in ");
+ pushfuncname(L, &ar);
+ if (ar.istailcall)
+ lua_pushliteral(L, "\n\t(...tail calls...)");
+ lua_concat(L, lua_gettop(L) - top);
+ }
+ }
+ lua_concat(L, lua_gettop(L) - top);
+}
+
+/* }====================================================== */
/*
@@ -39,7 +151,6 @@
** =======================================================
*/
-
LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
lua_Debug ar;
if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
@@ -52,13 +163,13 @@ LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
ar.name, extramsg);
}
if (ar.name == NULL)
- ar.name = "?";
+ ar.name = (pushglobalfuncname(L, &ar)) ? lua_tostring(L, -1) : "?";
return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
narg, ar.name, extramsg);
}
-LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
+static int typeerror (lua_State *L, int narg, const char *tname) {
const char *msg = lua_pushfstring(L, "%s expected, got %s",
tname, luaL_typename(L, narg));
return luaL_argerror(L, narg, msg);
@@ -66,7 +177,7 @@ LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
static void tag_error (lua_State *L, int narg, int tag) {
- luaL_typerror(L, narg, lua_typename(L, tag));
+ typeerror(L, narg, lua_typename(L, tag));
}
@@ -93,24 +204,74 @@ LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
return lua_error(L);
}
-/* }====================================================== */
+LUALIB_API int luaL_fileresult (lua_State *L, int stat, const char *fname) {
+ int en = errno; /* calls to Lua API may change this value */
+ if (stat) {
+ lua_pushboolean(L, 1);
+ return 1;
+ }
+ else {
+ lua_pushnil(L);
+ if (fname)
+ lua_pushfstring(L, "%s: %s", fname, strerror(en));
+ else
+ lua_pushstring(L, strerror(en));
+ lua_pushinteger(L, en);
+ return 3;
+ }
+}
-LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
- const char *const lst[]) {
- const char *name = (def) ? luaL_optstring(L, narg, def) :
- luaL_checkstring(L, narg);
- int i;
- for (i=0; lst[i]; i++)
- if (strcmp(lst[i], name) == 0)
- return i;
- return luaL_argerror(L, narg,
- lua_pushfstring(L, "invalid option " LUA_QS, name));
+
+#if !defined(inspectstat) /* { */
+
+#if defined(LUA_USE_POSIX)
+
+#include <sys/wait.h>
+
+/*
+** use appropriate macros to interpret 'pclose' return status
+*/
+#define inspectstat(stat,what) \
+ if (WIFEXITED(stat)) { stat = WEXITSTATUS(stat); } \
+ else if (WIFSIGNALED(stat)) { stat = WTERMSIG(stat); what = "signal"; }
+
+#else
+
+#define inspectstat(stat,what) /* no op */
+
+#endif
+
+#endif /* } */
+
+
+LUALIB_API int luaL_execresult (lua_State *L, int stat) {
+ const char *what = "exit"; /* type of termination */
+ if (stat == -1) /* error? */
+ return luaL_fileresult(L, 0, NULL);
+ else {
+ inspectstat(stat, what); /* interpret result */
+ if (*what == 'e' && stat == 0) /* successful termination? */
+ lua_pushboolean(L, 1);
+ else
+ lua_pushnil(L);
+ lua_pushstring(L, what);
+ lua_pushinteger(L, stat);
+ return 3; /* return true/nil,what,code */
+ }
}
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Userdata's metatable manipulation
+** =======================================================
+*/
LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get registry.name */
+ luaL_getmetatable(L, tname); /* try to get metatable */
if (!lua_isnil(L, -1)) /* name already in use? */
return 0; /* leave previous value on top, but return 0 */
lua_pop(L, 1);
@@ -121,25 +282,64 @@ LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
}
-LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
+LUALIB_API void luaL_setmetatable (lua_State *L, const char *tname) {
+ luaL_getmetatable(L, tname);
+ lua_setmetatable(L, -2);
+}
+
+
+LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) {
void *p = lua_touserdata(L, ud);
if (p != NULL) { /* value is a userdata? */
if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
- if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
- lua_pop(L, 2); /* remove both metatables */
- return p;
- }
+ luaL_getmetatable(L, tname); /* get correct metatable */
+ if (!lua_rawequal(L, -1, -2)) /* not the same? */
+ p = NULL; /* value is a userdata with wrong metatable */
+ lua_pop(L, 2); /* remove both metatables */
+ return p;
}
}
- luaL_typerror(L, ud, tname); /* else error */
- return NULL; /* to avoid warnings */
+ return NULL; /* value is not a userdata with a metatable */
}
-LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
- if (!lua_checkstack(L, space))
- luaL_error(L, "stack overflow (%s)", mes);
+LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
+ void *p = luaL_testudata(L, ud, tname);
+ if (p == NULL) typeerror(L, ud, tname);
+ return p;
+}
+
+/* }====================================================== */
+
+
+/*
+** {======================================================
+** Argument check functions
+** =======================================================
+*/
+
+LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
+ const char *const lst[]) {
+ const char *name = (def) ? luaL_optstring(L, narg, def) :
+ luaL_checkstring(L, narg);
+ int i;
+ for (i=0; lst[i]; i++)
+ if (strcmp(lst[i], name) == 0)
+ return i;
+ return luaL_argerror(L, narg,
+ lua_pushfstring(L, "invalid option " LUA_QS, name));
+}
+
+
+LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *msg) {
+ /* keep some extra space to run error routines, if needed */
+ const int extra = LUA_MINSTACK;
+ if (!lua_checkstack(L, space + extra)) {
+ if (msg)
+ luaL_error(L, "stack overflow (%s)", msg);
+ else
+ luaL_error(L, "stack overflow");
+ }
}
@@ -174,8 +374,9 @@ LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
- lua_Number d = lua_tonumber(L, narg);
- if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
+ int isnum;
+ lua_Number d = lua_tonumberx(L, narg, &isnum);
+ if (!isnum)
tag_error(L, narg, LUA_TNUMBER);
return d;
}
@@ -187,268 +388,79 @@ LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
- lua_Integer d = lua_tointeger(L, narg);
- if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
+ int isnum;
+ lua_Integer d = lua_tointegerx(L, narg, &isnum);
+ if (!isnum)
tag_error(L, narg, LUA_TNUMBER);
return d;
}
-LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
- lua_Integer def) {
- return luaL_opt(L, luaL_checkinteger, narg, def);
-}
-
-
-LUALIB_API int luaL_checkboolean (lua_State *L, int narg) {
- int b = lua_toboolean(L, narg);
- if( b == 0 && !lua_isboolean(L, narg))
- tag_error(L, narg, LUA_TBOOLEAN);
- return b;
-}
-
-
-LUALIB_API int luaL_optboolean (lua_State *L, int narg, int def) {
- return luaL_opt(L, luaL_checkboolean, narg, def);
-}
-
-
-LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
- if (!lua_getmetatable(L, obj)) /* no metatable? */
- return 0;
- lua_pushstring(L, event);
- lua_rawget(L, -2);
- if (lua_isnil(L, -1)) {
- lua_pop(L, 2); /* remove metatable and metafield */
- return 0;
- }
- else {
- lua_remove(L, -2); /* remove only metatable */
- return 1;
- }
-}
-
-
-LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
- obj = abs_index(L, obj);
- if (!luaL_getmetafield(L, obj, event)) /* no metafield? */
- return 0;
- lua_pushvalue(L, obj);
- lua_call(L, 1, 1);
- return 1;
-}
-
-
-LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
- const luaL_Reg *l) {
- luaI_openlib(L, libname, l, 0);
-}
-
-
-static int libsize (const luaL_Reg *l) {
- int size = 0;
- for (; l->name; l++) size++;
- return size;
-}
-
-
-LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
- const luaL_Reg *l, int nup) {
- if (libname) {
- int size = libsize(l);
- /* check whether lib already exists */
- luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
- lua_getfield(L, -1, libname); /* get _LOADED[libname] */
- if (!lua_istable(L, -1)) { /* not found? */
- lua_pop(L, 1); /* remove previous result */
- /* try global variable (and create one if it does not exist) */
- if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
- luaL_error(L, "name conflict for module " LUA_QS, libname);
- lua_pushvalue(L, -1);
- lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
- }
- lua_remove(L, -2); /* remove _LOADED table */
- lua_insert(L, -(nup+1)); /* move library table to below upvalues */
- }
- for (; l->name; l++) {
- int i;
- for (i=0; i<nup; i++) /* copy upvalues to the top */
- lua_pushvalue(L, -nup);
- lua_pushcclosure(L, l->func, nup);
- lua_setfield(L, -(nup+2), l->name);
- }
- lua_pop(L, nup); /* remove upvalues */
-}
-
-
-
-/*
-** {======================================================
-** getn-setn: size for arrays
-** =======================================================
-*/
-
-#if defined(LUA_COMPAT_GETN)
-
-static int checkint (lua_State *L, int topop) {
- int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
- lua_pop(L, topop);
- return n;
-}
-
-
-static void getsizes (lua_State *L) {
- lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
- if (lua_isnil(L, -1)) { /* no `size' table? */
- lua_pop(L, 1); /* remove nil */
- lua_newtable(L); /* create it */
- lua_pushvalue(L, -1); /* `size' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushliteral(L, "kv");
- lua_setfield(L, -2, "__mode"); /* metatable(N).__mode = "kv" */
- lua_pushvalue(L, -1);
- lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES"); /* store in register */
- }
+LUALIB_API lua_Unsigned luaL_checkunsigned (lua_State *L, int narg) {
+ int isnum;
+ lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);
+ if (!isnum)
+ tag_error(L, narg, LUA_TNUMBER);
+ return d;
}
-LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
- t = abs_index(L, t);
- lua_pushliteral(L, "n");
- lua_rawget(L, t);
- if (checkint(L, 1) >= 0) { /* is there a numeric field `n'? */
- lua_pushliteral(L, "n"); /* use it */
- lua_pushinteger(L, n);
- lua_rawset(L, t);
- }
- else { /* use `sizes' */
- getsizes(L);
- lua_pushvalue(L, t);
- lua_pushinteger(L, n);
- lua_rawset(L, -3); /* sizes[t] = n */
- lua_pop(L, 1); /* remove `sizes' */
- }
+LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
+ lua_Integer def) {
+ return luaL_opt(L, luaL_checkinteger, narg, def);
}
-LUALIB_API int luaL_getn (lua_State *L, int t) {
- int n;
- t = abs_index(L, t);
- lua_pushliteral(L, "n"); /* try t.n */
- lua_rawget(L, t);
- if ((n = checkint(L, 1)) >= 0) return n;
- getsizes(L); /* else try sizes[t] */
- lua_pushvalue(L, t);
- lua_rawget(L, -2);
- if ((n = checkint(L, 2)) >= 0) return n;
- return (int)lua_objlen(L, t);
+LUALIB_API lua_Unsigned luaL_optunsigned (lua_State *L, int narg,
+ lua_Unsigned def) {
+ return luaL_opt(L, luaL_checkunsigned, narg, def);
}
-#endif
-
/* }====================================================== */
-
-LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
- const char *r) {
- const char *wild;
- size_t l = strlen(p);
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- while ((wild = strstr(s, p)) != NULL) {
- luaL_addlstring(&b, s, wild - s); /* push prefix */
- luaL_addstring(&b, r); /* push replacement in place of pattern */
- s = wild + l; /* continue after `p' */
- }
- luaL_addstring(&b, s); /* push last suffix */
- luaL_pushresult(&b);
- return lua_tostring(L, -1);
-}
-
-
-LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
- const char *fname, int szhint) {
- const char *e;
- lua_pushvalue(L, idx);
- do {
- e = strchr(fname, '.');
- if (e == NULL) e = fname + strlen(fname);
- lua_pushlstring(L, fname, e - fname);
- lua_rawget(L, -2);
- if (lua_isnil(L, -1)) { /* no such field? */
- lua_pop(L, 1); /* remove this nil */
- lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
- lua_pushlstring(L, fname, e - fname);
- lua_pushvalue(L, -2);
- lua_settable(L, -4); /* set new table into field */
- }
- else if (!lua_istable(L, -1)) { /* field has a non-table value? */
- lua_pop(L, 2); /* remove table and value */
- return fname; /* return problematic part of the name */
- }
- lua_remove(L, -2); /* remove previous table */
- fname = e + 1;
- } while (*e == '.');
- return NULL;
-}
-
-
-
/*
** {======================================================
** Generic Buffer manipulation
** =======================================================
*/
-
-#define bufflen(B) ((B)->p - (B)->buffer)
-#define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
-
-#define LIMIT (LUA_MINSTACK/2)
-
-
-static int emptybuffer (luaL_Buffer *B) {
- size_t l = bufflen(B);
- if (l == 0) return 0; /* put nothing on stack */
- else {
- lua_pushlstring(B->L, B->buffer, l);
- B->p = B->buffer;
- B->lvl++;
- return 1;
- }
-}
+/*
+** check whether buffer is using a userdata on the stack as a temporary
+** buffer
+*/
+#define buffonstack(B) ((B)->b != (B)->initb)
-static void adjuststack (luaL_Buffer *B) {
- if (B->lvl > 1) {
- lua_State *L = B->L;
- int toget = 1; /* number of levels to concat */
- size_t toplen = lua_strlen(L, -1);
- do {
- size_t l = lua_strlen(L, -(toget+1));
- if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
- toplen += l;
- toget++;
- }
- else break;
- } while (toget < B->lvl);
- lua_concat(L, toget);
- B->lvl = B->lvl - toget + 1;
+/*
+** returns a pointer to a free area with at least 'sz' bytes
+*/
+LUALIB_API char *luaL_prepbuffsize (luaL_Buffer *B, size_t sz) {
+ lua_State *L = B->L;
+ if (B->size - B->n < sz) { /* not enough space? */
+ char *newbuff;
+ size_t newsize = B->size * 2; /* double buffer size */
+ if (newsize - B->n < sz) /* not big enough? */
+ newsize = B->n + sz;
+ if (newsize < B->n || newsize - B->n < sz)
+ luaL_error(L, "buffer too large");
+ /* create larger buffer */
+ newbuff = (char *)lua_newuserdata(L, newsize * sizeof(char));
+ /* move content to new buffer */
+ memcpy(newbuff, B->b, B->n * sizeof(char));
+ if (buffonstack(B))
+ lua_remove(L, -2); /* remove old buffer */
+ B->b = newbuff;
+ B->size = newsize;
}
-}
-
-
-LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
- if (emptybuffer(B))
- adjuststack(B);
- return B->buffer;
+ return &B->b[B->n];
}
LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
- while (l--)
- luaL_addchar(B, *s++);
+ char *b = luaL_prepbuffsize(B, l);
+ memcpy(b, s, l * sizeof(char));
+ luaL_addsize(B, l);
}
@@ -458,57 +470,72 @@ LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
- emptybuffer(B);
- lua_concat(B->L, B->lvl);
- B->lvl = 1;
+ lua_State *L = B->L;
+ lua_pushlstring(L, B->b, B->n);
+ if (buffonstack(B))
+ lua_remove(L, -2); /* remove old buffer */
+}
+
+
+LUALIB_API void luaL_pushresultsize (luaL_Buffer *B, size_t sz) {
+ luaL_addsize(B, sz);
+ luaL_pushresult(B);
}
LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
lua_State *L = B->L;
- size_t vl;
- const char *s = lua_tolstring(L, -1, &vl);
- if (vl <= bufffree(B)) { /* fit into buffer? */
- memcpy(B->p, s, vl); /* put it there */
- B->p += vl;
- lua_pop(L, 1); /* remove from stack */
- }
- else {
- if (emptybuffer(B))
- lua_insert(L, -2); /* put buffer before new value */
- B->lvl++; /* add new value into B stack */
- adjuststack(B);
- }
+ size_t l;
+ const char *s = lua_tolstring(L, -1, &l);
+ if (buffonstack(B))
+ lua_insert(L, -2); /* put value below buffer */
+ luaL_addlstring(B, s, l);
+ lua_remove(L, (buffonstack(B)) ? -2 : -1); /* remove value */
}
LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
B->L = L;
- B->p = B->buffer;
- B->lvl = 0;
+ B->b = B->initb;
+ B->n = 0;
+ B->size = LUAL_BUFFERSIZE;
+}
+
+
+LUALIB_API char *luaL_buffinitsize (lua_State *L, luaL_Buffer *B, size_t sz) {
+ luaL_buffinit(L, B);
+ return luaL_prepbuffsize(B, sz);
}
/* }====================================================== */
+/*
+** {======================================================
+** Reference system
+** =======================================================
+*/
+
+/* index of free-list header */
+#define freelist 0
+
+
LUALIB_API int luaL_ref (lua_State *L, int t) {
int ref;
- t = abs_index(L, t);
if (lua_isnil(L, -1)) {
lua_pop(L, 1); /* remove from stack */
return LUA_REFNIL; /* `nil' has a unique fixed reference */
}
- lua_rawgeti(L, t, FREELIST_REF); /* get first free element */
- ref = (int)lua_tointeger(L, -1); /* ref = t[FREELIST_REF] */
+ t = lua_absindex(L, t);
+ lua_rawgeti(L, t, freelist); /* get first free element */
+ ref = (int)lua_tointeger(L, -1); /* ref = t[freelist] */
lua_pop(L, 1); /* remove it from stack */
if (ref != 0) { /* any free element? */
lua_rawgeti(L, t, ref); /* remove it from list */
- lua_rawseti(L, t, FREELIST_REF); /* (t[FREELIST_REF] = t[ref]) */
- }
- else { /* no free elements */
- ref = (int)lua_objlen(L, t);
- ref++; /* create new reference */
+ lua_rawseti(L, t, freelist); /* (t[freelist] = t[ref]) */
}
+ else /* no free elements */
+ ref = (int)lua_rawlen(L, t) + 1; /* get a new reference */
lua_rawseti(L, t, ref);
return ref;
}
@@ -516,14 +543,15 @@ LUALIB_API int luaL_ref (lua_State *L, int t) {
LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
if (ref >= 0) {
- t = abs_index(L, t);
- lua_rawgeti(L, t, FREELIST_REF);
- lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */
+ t = lua_absindex(L, t);
+ lua_rawgeti(L, t, freelist);
+ lua_rawseti(L, t, ref); /* t[ref] = t[freelist] */
lua_pushinteger(L, ref);
- lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
+ lua_rawseti(L, t, freelist); /* t[freelist] = ref */
}
}
+/* }====================================================== */
/*
@@ -533,22 +561,28 @@ LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
*/
typedef struct LoadF {
- int extraline;
+ int n; /* number of pre-read characters */
int f;
- char buff[LUAL_BUFFERSIZE];
+ char buff[LUAL_BUFFERSIZE]; /* area for reading file */
} LoadF;
-static const char *getF(lua_State *L, void *ud, size_t *size) {
+
+static const char *getF (lua_State *L, void *ud, size_t *size) {
LoadF *lf = (LoadF *)ud;
- (void)L;
- if (lf->extraline) {
- lf->extraline = 0;
- *size = 1;
- return "\n";
+ (void)L; /* not used */
+ if (lf->n > 0) { /* are there pre-read characters to be read? */
+ *size = lf->n; /* return them (chars already in buffer) */
+ lf->n = 0; /* no more pre-read characters */
+ }
+ else { /* read a block from file */
+ /* 'fread' can return > 0 *and* set the EOF flag. If next call to
+ 'getF' called 'fread', it might still wait for user input.
+ The next check avoids this problem. */
+ *size = rb->read(lf->f, lf->buff, LUAL_BUFFERSIZE);
+ if (*size <= 0) return NULL;
+ return (*size > 0) ? lf->buff : NULL;
}
- *size = rb->read(lf->f, lf->buff, LUAL_BUFFERSIZE);
- if (*size <= 0) return NULL;
- return (*size > 0) ? lf->buff : NULL;
+ return lf->buff;
}
@@ -560,16 +594,68 @@ static int errfile (lua_State *L, const char *what, int fnameindex) {
return LUA_ERRFILE;
}
-LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
+
+static int skipBOM (LoadF *lf) {
+ const char *p = "\xEF\xBB\xBF"; /* Utf8 BOM mark */
+ int c;
+ lf->n = 0;
+ do {
+ c = PREFIX(getc)(lf->f);
+ if (c == EOF || c != *(const unsigned char *)p++) return c;
+ lf->buff[lf->n++] = c; /* to be read by the parser */
+ } while (*p != '\0');
+ lf->n = 0; /* prefix matched; discard it */
+ return PREFIX(getc)(lf->f); /* return next character */
+}
+
+
+/*
+** reads the first character of file 'f' and skips an optional BOM mark
+** in its beginning plus its first line if it starts with '#'. Returns
+** true if it skipped the first line. In any case, '*cp' has the
+** first "valid" character of the file (after the optional BOM and
+** a first-line comment).
+*/
+static int skipcomment (LoadF *lf, int *cp) {
+ int c = *cp = skipBOM(lf);
+ if (c == '#') { /* first line is a comment (Unix exec. file)? */
+ do { /* skip first line */
+ c = PREFIX(getc)(lf->f);
+ } while (c != EOF && c != '\n') ;
+ *cp = PREFIX(getc)(lf->f); /* skip end-of-line, if present */
+ return 1; /* there was a comment */
+ }
+ else return 0; /* no comment */
+}
+
+
+LUALIB_API int luaL_loadfilex (lua_State *L, const char *filename,
+ const char *mode) {
LoadF lf;
- int status;
+ int status, readstatus;
+ int c;
int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
- lf.extraline = 0;
- lf.f = rb->open(filename, O_RDONLY);
lua_pushfstring(L, "@%s", filename);
+ lf.n = 0;
+ lf.f = rb->open(filename, O_RDONLY);
if (lf.f < 0) return errfile(L, "open", fnameindex);
- status = lua_load(L, getF, &lf, lua_tostring(L, -1));
- rb->close(lf.f);
+ if (skipcomment(&lf, &c)) /* read initial portion */
+ lf.buff[lf.n++] = '\n'; /* add line to correct line numbers */
+ if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */
+ rb->close(lf.f);
+ lf.f = rb->open(filename, O_RDONLY);
+ if (lf.f < 0) return errfile(L, "reopen", fnameindex);
+ skipcomment(&lf, &c); /* re-read initial portion */
+ }
+ if (c != EOF)
+ lf.buff[lf.n++] = c; /* 'c' is the first character of the stream */
+ status = lua_load(L, getF, &lf, lua_tostring(L, -1), mode);
+ readstatus = 0;/*ferror(lf.f);*/
+ if (filename) rb->close(lf.f); /* close file (even in case of errors) */
+ if (readstatus) {
+ lua_settop(L, fnameindex); /* ignore results from `lua_load' */
+ return errfile(L, "read", fnameindex);
+ }
lua_remove(L, fnameindex);
return status;
}
@@ -583,7 +669,7 @@ typedef struct LoadS {
static const char *getS (lua_State *L, void *ud, size_t *size) {
LoadS *ls = (LoadS *)ud;
- (void)L;
+ (void)L; /* not used */
if (ls->size == 0) return NULL;
*size = ls->size;
ls->size = 0;
@@ -591,27 +677,245 @@ static const char *getS (lua_State *L, void *ud, size_t *size) {
}
-LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
- const char *name) {
+LUALIB_API int luaL_loadbufferx (lua_State *L, const char *buff, size_t size,
+ const char *name, const char *mode) {
LoadS ls;
ls.s = buff;
ls.size = size;
- return lua_load(L, getS, &ls, name);
+ return lua_load(L, getS, &ls, name, mode);
}
-LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
+LUALIB_API int luaL_loadstring (lua_State *L, const char *s) {
return luaL_loadbuffer(L, s, strlen(s), s);
}
+/* }====================================================== */
+
+
+
+LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
+ if (!lua_getmetatable(L, obj)) /* no metatable? */
+ return 0;
+ lua_pushstring(L, event);
+ lua_rawget(L, -2);
+ if (lua_isnil(L, -1)) {
+ lua_pop(L, 2); /* remove metatable and metafield */
+ return 0;
+ }
+ else {
+ lua_remove(L, -2); /* remove only metatable */
+ return 1;
+ }
+}
+
+
+LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
+ obj = lua_absindex(L, obj);
+ if (!luaL_getmetafield(L, obj, event)) /* no metafield? */
+ return 0;
+ lua_pushvalue(L, obj);
+ lua_call(L, 1, 1);
+ return 1;
+}
+
+
+LUALIB_API int luaL_len (lua_State *L, int idx) {
+ int l;
+ int isnum;
+ lua_len(L, idx);
+ l = (int)lua_tointegerx(L, -1, &isnum);
+ if (!isnum)
+ luaL_error(L, "object length is not a number");
+ lua_pop(L, 1); /* remove object */
+ return l;
+}
+
+
+LUALIB_API const char *luaL_tolstring (lua_State *L, int idx, size_t *len) {
+ if (!luaL_callmeta(L, idx, "__tostring")) { /* no metafield? */
+ switch (lua_type(L, idx)) {
+ case LUA_TNUMBER:
+ case LUA_TSTRING:
+ lua_pushvalue(L, idx);
+ break;
+ case LUA_TBOOLEAN:
+ lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));
+ break;
+ case LUA_TNIL:
+ lua_pushliteral(L, "nil");
+ break;
+ default:
+ lua_pushfstring(L, "%s: %p", luaL_typename(L, idx),
+ lua_topointer(L, idx));
+ break;
+ }
+ }
+ return lua_tolstring(L, -1, len);
+}
+
+
+/*
+** {======================================================
+** Compatibility with 5.1 module functions
+** =======================================================
+*/
+#if defined(LUA_COMPAT_MODULE)
+
+static const char *luaL_findtable (lua_State *L, int idx,
+ const char *fname, int szhint) {
+ const char *e;
+ if (idx) lua_pushvalue(L, idx);
+ do {
+ e = strchr(fname, '.');
+ if (e == NULL) e = fname + strlen(fname);
+ lua_pushlstring(L, fname, e - fname);
+ lua_rawget(L, -2);
+ if (lua_isnil(L, -1)) { /* no such field? */
+ lua_pop(L, 1); /* remove this nil */
+ lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
+ lua_pushlstring(L, fname, e - fname);
+ lua_pushvalue(L, -2);
+ lua_settable(L, -4); /* set new table into field */
+ }
+ else if (!lua_istable(L, -1)) { /* field has a non-table value? */
+ lua_pop(L, 2); /* remove table and value */
+ return fname; /* return problematic part of the name */
+ }
+ lua_remove(L, -2); /* remove previous table */
+ fname = e + 1;
+ } while (*e == '.');
+ return NULL;
+}
+
+
+/*
+** Count number of elements in a luaL_Reg list.
+*/
+static int libsize (const luaL_Reg *l) {
+ int size = 0;
+ for (; l && l->name; l++) size++;
+ return size;
+}
+
+
+/*
+** Find or create a module table with a given name. The function
+** first looks at the _LOADED table and, if that fails, try a
+** global variable with that name. In any case, leaves on the stack
+** the module table.
+*/
+LUALIB_API void luaL_pushmodule (lua_State *L, const char *modname,
+ int sizehint) {
+ luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1); /* get _LOADED table */
+ lua_getfield(L, -1, modname); /* get _LOADED[modname] */
+ if (!lua_istable(L, -1)) { /* not found? */
+ lua_pop(L, 1); /* remove previous result */
+ /* try global variable (and create one if it does not exist) */
+ lua_pushglobaltable(L);
+ if (luaL_findtable(L, 0, modname, sizehint) != NULL)
+ luaL_error(L, "name conflict for module " LUA_QS, modname);
+ lua_pushvalue(L, -1);
+ lua_setfield(L, -3, modname); /* _LOADED[modname] = new table */
+ }
+ lua_remove(L, -2); /* remove _LOADED table */
+}
+LUALIB_API void luaL_openlib (lua_State *L, const char *libname,
+ const luaL_Reg *l, int nup) {
+ luaL_checkversion(L);
+ if (libname) {
+ luaL_pushmodule(L, libname, libsize(l)); /* get/create library table */
+ lua_insert(L, -(nup + 1)); /* move library table to below upvalues */
+ }
+ if (l)
+ luaL_setfuncs(L, l, nup);
+ else
+ lua_pop(L, nup); /* remove upvalues */
+}
+
+#endif
/* }====================================================== */
+/*
+** set functions from list 'l' into table at top - 'nup'; each
+** function gets the 'nup' elements at the top as upvalues.
+** Returns with only the table at the stack.
+*/
+LUALIB_API void luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
+ luaL_checkversion(L);
+ luaL_checkstack(L, nup, "too many upvalues");
+ for (; l->name != NULL; l++) { /* fill the table with given functions */
+ int i;
+ for (i = 0; i < nup; i++) /* copy upvalues to the top */
+ lua_pushvalue(L, -nup);
+ lua_pushcclosure(L, l->func, nup); /* closure with those upvalues */
+ lua_setfield(L, -(nup + 2), l->name);
+ }
+ lua_pop(L, nup); /* remove upvalues */
+}
+
+
+/*
+** ensure that stack[idx][fname] has a table and push that table
+** into the stack
+*/
+LUALIB_API int luaL_getsubtable (lua_State *L, int idx, const char *fname) {
+ lua_getfield(L, idx, fname);
+ if (lua_istable(L, -1)) return 1; /* table already there */
+ else {
+ lua_pop(L, 1); /* remove previous result */
+ idx = lua_absindex(L, idx);
+ lua_newtable(L);
+ lua_pushvalue(L, -1); /* copy to be left at top */
+ lua_setfield(L, idx, fname); /* assign new table to field */
+ return 0; /* false, because did not find table there */
+ }
+}
+
+
+/*
+** stripped-down 'require'. Calls 'openf' to open a module,
+** registers the result in 'package.loaded' table and, if 'glb'
+** is true, also registers the result in the global table.
+** Leaves resulting module on the top.
+*/
+LUALIB_API void luaL_requiref (lua_State *L, const char *modname,
+ lua_CFunction openf, int glb) {
+ lua_pushcfunction(L, openf);
+ lua_pushstring(L, modname); /* argument to open function */
+ lua_call(L, 1, 1); /* open module */
+ luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");
+ lua_pushvalue(L, -2); /* make copy of module (call result) */
+ lua_setfield(L, -2, modname); /* _LOADED[modname] = module */
+ lua_pop(L, 1); /* remove _LOADED table */
+ if (glb) {
+ lua_pushvalue(L, -1); /* copy of 'mod' */
+ lua_setglobal(L, modname); /* _G[modname] = module */
+ }
+}
+
+
+LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
+ const char *r) {
+ const char *wild;
+ size_t l = strlen(p);
+ luaL_Buffer b;
+ luaL_buffinit(L, &b);
+ while ((wild = strstr(s, p)) != NULL) {
+ luaL_addlstring(&b, s, wild - s); /* push prefix */
+ luaL_addstring(&b, r); /* push replacement in place of pattern */
+ s = wild + l; /* continue after `p' */
+ }
+ luaL_addstring(&b, s); /* push last suffix */
+ luaL_pushresult(&b);
+ return lua_tostring(L, -1);
+}
+
static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
- (void)ud;
- (void)osize;
+ (void)ud; (void)osize; /* not used */
if (nsize == 0) {
free(ptr);
return NULL;
@@ -622,12 +926,11 @@ static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
static int panic (lua_State *L) {
- DEBUGF("PANIC: unprotected error in call to Lua API (%s)\n",
- lua_tostring(L, -1));
- rb->splashf(5 * HZ, "PANIC: unprotected error in call to Lua API (%s)",
+ DEBUGF("PANIC: unprotected error in call to Lua API (%s)\n",
+ lua_tostring(L, -1));
+ rb->splashf(5 * HZ, "PANIC: unprotected error in call to Lua API (%s)",
lua_tostring(L, -1));
-
- return 0;
+ return 0; /* return to Lua to abort */
}
@@ -637,3 +940,20 @@ LUALIB_API lua_State *luaL_newstate (void) {
return L;
}
+
+LUALIB_API void luaL_checkversion_ (lua_State *L, lua_Number ver) {
+ const lua_Number *v = lua_version(L);
+ if (v != lua_version(NULL))
+ luaL_error(L, "multiple Lua VMs detected");
+ else if (*v != ver)
+ luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f",
+ ver, *v);
+ /* check conversions number -> integer types */
+ lua_pushnumber(L, -(lua_Number)0x1234);
+ if (lua_tointeger(L, -1) != -0x1234 ||
+ lua_tounsigned(L, -1) != (lua_Unsigned)-0x1234)
+ luaL_error(L, "bad conversion number->int;"
+ " must recompile Lua with proper settings");
+ lua_pop(L, 1);
+}
+