mirror of
https://github.com/lua/lua
synced 2024-11-22 21:01:26 +03:00
better the old way, using upvalues to keep iotag.
This commit is contained in:
Roberto Ierusalimschy
parent
7c9aee64c2
commit
de04533dc0
101
liolib.c
101
liolib.c
@ -1,5 +1,5 @@
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/*
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** $Id: liolib.c,v 1.35 1999/03/16 20:07:54 roberto Exp roberto $
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** $Id: liolib.c,v 1.36 1999/03/26 13:48:26 roberto Exp roberto $
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** Standard I/O (and system) library
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** See Copyright Notice in lua.h
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*/
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@ -32,21 +32,25 @@
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#endif
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#define CLOSEDTAG(tag) ((tag)-1)
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#define IOTAG 1
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#define FIRSTARG 2 /* 1st is upvalue */
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#define CLOSEDTAG(tag) ((tag)-1) /* assume that CLOSEDTAG = iotag-1 */
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#define FINPUT "_INPUT"
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#define FOUTPUT "_OUTPUT"
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#define MODESIZE 3 /* string for file mode */
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#ifdef POPEN
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FILE *popen();
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int pclose();
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#define CLOSEFILE(f) {if (pclose(f) == -1) fclose(f);}
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#else
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/* no support for popen */
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#define popen(x,y) NULL /* that is, popen always fails */
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#define pclose(x) (-1)
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#define CLOSEFILE(f) {fclose(f);}
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#endif
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@ -69,8 +73,7 @@ static void pushresult (int i) {
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*/
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static int gettag (void) {
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lua_pushusertag(stdin, LUA_ANYTAG);
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return lua_tag(lua_pop()); /* get the tag of stdin */
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return (int)lua_getnumber(lua_getparam(IOTAG));
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}
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@ -117,17 +120,10 @@ static FILE *getfileparam (char *name, int *arg) {
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}
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static void rawclose (FILE *f) {
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if (f != stdin && f != stdout) {
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if (pclose(f) == -1) fclose(f);
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}
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}
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static void closefile (FILE *f) {
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if (f != stdin && f != stdout) {
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int tag = gettag();
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rawclose(f);
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CLOSEFILE(f);
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lua_pushusertag(f, tag);
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lua_settag(CLOSEDTAG(tag));
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}
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@ -135,22 +131,20 @@ static void closefile (FILE *f) {
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static void io_close (void) {
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closefile(getnonullfile(1));
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closefile(getnonullfile(FIRSTARG));
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}
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static void gc_close (void) {
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int tag = luaL_check_int(1);
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lua_Object fh = lua_getparam(2);
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FILE *f = lua_getuserdata(fh);
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luaL_arg_check(lua_isuserdata(fh) && lua_tag(fh) == tag, 2,
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"invalid file handle for GC");
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rawclose(f);
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FILE *f = getnonullfile(FIRSTARG);
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if (f != stdin && f != stdout && f != stderr) {
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CLOSEFILE(f);
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}
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}
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static void io_open (void) {
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FILE *f = fopen(luaL_check_string(1), luaL_check_string(2));
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FILE *f = fopen(luaL_check_string(FIRSTARG), luaL_check_string(FIRSTARG+1));
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if (f) lua_pushusertag(f, gettag());
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else pushresult(0);
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}
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@ -171,7 +165,7 @@ static void setreturn (FILE *f, char *name) {
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static void io_readfrom (void) {
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FILE *current;
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lua_Object f = lua_getparam(1);
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lua_Object f = lua_getparam(FIRSTARG);
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if (f == LUA_NOOBJECT) {
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closefile(getfilebyname(FINPUT));
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current = stdin;
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@ -179,7 +173,7 @@ static void io_readfrom (void) {
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else if (lua_tag(f) == gettag()) /* deprecated option */
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current = lua_getuserdata(f);
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else {
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char *s = luaL_check_string(1);
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char *s = luaL_check_string(FIRSTARG);
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current = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
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if (current == NULL) {
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pushresult(0);
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@ -192,7 +186,7 @@ static void io_readfrom (void) {
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static void io_writeto (void) {
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FILE *current;
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lua_Object f = lua_getparam(1);
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lua_Object f = lua_getparam(FIRSTARG);
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if (f == LUA_NOOBJECT) {
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closefile(getfilebyname(FOUTPUT));
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current = stdout;
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@ -200,7 +194,7 @@ static void io_writeto (void) {
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else if (lua_tag(f) == gettag()) /* deprecated option */
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current = lua_getuserdata(f);
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else {
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char *s = luaL_check_string(1);
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char *s = luaL_check_string(FIRSTARG);
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current = (*s == '|') ? popen(s+1,"w") : fopen(s, "w");
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if (current == NULL) {
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pushresult(0);
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@ -212,7 +206,7 @@ static void io_writeto (void) {
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static void io_appendto (void) {
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FILE *fp = fopen(luaL_check_string(1), "a");
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FILE *fp = fopen(luaL_check_string(FIRSTARG), "a");
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if (fp != NULL)
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setreturn(fp, FOUTPUT);
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else
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@ -317,7 +311,7 @@ static void read_file (FILE *f) {
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static void io_read (void) {
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static char *options[] = {"*n", "*l", "*a", ".*", "*w", NULL};
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int arg = 1;
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int arg = FIRSTARG;
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FILE *f = getfileparam(FINPUT, &arg);
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char *p = luaL_opt_string(arg++, "*l");
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do { /* repeat for each part */
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@ -351,7 +345,7 @@ static void io_read (void) {
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static void io_write (void) {
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int arg = 1;
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int arg = FIRSTARG;
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FILE *f = getfileparam(FOUTPUT, &arg);
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int status = 1;
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char *s;
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@ -365,10 +359,10 @@ static void io_write (void) {
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static void io_seek (void) {
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static int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
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static char *modenames[] = {"set", "cur", "end", NULL};
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FILE *f = getnonullfile(1);
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int op = luaL_findstring(luaL_opt_string(2, "cur"), modenames);
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long offset = luaL_opt_long(3, 0);
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luaL_arg_check(op != -1, 2, "invalid mode");
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FILE *f = getnonullfile(FIRSTARG);
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int op = luaL_findstring(luaL_opt_string(FIRSTARG+1, "cur"), modenames);
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long offset = luaL_opt_long(FIRSTARG+2, 0);
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luaL_arg_check(op != -1, FIRSTARG+1, "invalid mode");
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op = fseek(f, offset, mode[op]);
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if (op)
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pushresult(0); /* error */
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@ -378,8 +372,8 @@ static void io_seek (void) {
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static void io_flush (void) {
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FILE *f = getfile(1);
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luaL_arg_check(f || lua_getparam(1) == LUA_NOOBJECT, 1,
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FILE *f = getfile(FIRSTARG);
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luaL_arg_check(f || lua_getparam(FIRSTARG) == LUA_NOOBJECT, FIRSTARG,
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"invalid file handle");
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pushresult(fflush(f) == 0);
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}
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@ -532,44 +526,57 @@ static void errorfb (void) {
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static struct luaL_reg iolib[] = {
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{"_ERRORMESSAGE", errorfb},
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{"appendto", io_appendto},
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{"clock", io_clock},
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{"closefile", io_close},
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{"date", io_date},
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{"debug", io_debug},
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{"execute", io_execute},
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{"exit", io_exit},
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{"flush", io_flush},
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{"getenv", io_getenv},
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{"remove", io_remove},
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{"rename", io_rename},
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{"setlocale", setloc},
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{"tmpname", io_tmpname}
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};
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static struct luaL_reg iolibtag[] = {
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{"appendto", io_appendto},
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{"closefile", io_close},
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{"flush", io_flush},
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{"openfile", io_open},
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{"read", io_read},
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{"readfrom", io_readfrom},
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{"remove", io_remove},
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{"rename", io_rename},
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{"seek", io_seek},
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{"setlocale", setloc},
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{"tmpname", io_tmpname},
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{"write", io_write},
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{"writeto", io_writeto}
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};
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void lua_iolibopen (void) {
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static void openwithtags (void) {
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int i;
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int iotag = lua_newtag();
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lua_newtag(); /* alloc CLOSEDTAG: assume that CLOSEDTAG = iotag-1 */
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for (i=0; i<sizeof(iolibtag)/sizeof(iolibtag[0]); i++) {
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/* put iotag as upvalue for these functions */
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lua_pushnumber(iotag);
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lua_pushcclosure(iolibtag[i].func, 1);
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lua_setglobal(iolibtag[i].name);
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}
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/* predefined file handles */
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setfile(stdin, FINPUT, iotag);
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setfile(stdout, FOUTPUT, iotag);
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setfile(stdin, "_STDIN", iotag);
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setfile(stdout, "_STDOUT", iotag);
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setfile(stderr, "_STDERR", iotag);
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/* make sure stdin (with its tag) won't be collected */
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lua_pushusertag(stdin, iotag); lua_ref(1);
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/* close file when collected */
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lua_pushnumber(iotag);
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lua_pushcclosure(gc_close, 1);
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lua_settagmethod(iotag, "gc");
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/* register lib functions */
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luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
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}
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void lua_iolibopen (void) {
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/* register lib functions */
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luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
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openwithtags();
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}
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