mirror of
https://github.com/lua/lua
synced 2024-11-25 22:29:39 +03:00
new functions openfile and closefile;
new way to keep file handle tags.
This commit is contained in:
Roberto Ierusalimschy
parent
7a11c7f8e4
commit
d6ff06751a
163
liolib.c
163
liolib.c
@ -1,5 +1,5 @@
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/*
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** $Id: liolib.c,v 1.33 1999/03/05 20:45:01 roberto Exp roberto $
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** $Id: liolib.c,v 1.34 1999/03/11 18:59:19 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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@ -32,10 +32,8 @@
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#endif
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#define CLOSEDTAG 2
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#define IOTAG 1
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#define CLOSEDTAG(tag) ((tag)-1)
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#define FIRSTARG 3 /* 1st and 2nd are upvalues */
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#define FINPUT "_INPUT"
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#define FOUTPUT "_OUTPUT"
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@ -70,20 +68,23 @@ static void pushresult (int i) {
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** =======================================================
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*/
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static int gettag (int i) {
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return (int)lua_getnumber(lua_getparam(i));
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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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}
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static int ishandler (lua_Object f) {
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if (lua_isuserdata(f)) {
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if (lua_tag(f) == gettag(CLOSEDTAG))
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int tag = gettag();
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if (lua_tag(f) == CLOSEDTAG(tag))
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lua_error("cannot access a closed file");
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return lua_tag(f) == gettag(IOTAG);
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return lua_tag(f) == tag;
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}
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else return 0;
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}
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static FILE *getfilebyname (char *name) {
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lua_Object f = lua_getglobal(name);
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if (!ishandler(f))
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@ -98,6 +99,13 @@ static FILE *getfile (int arg) {
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}
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static FILE *getnonullfile (int arg) {
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FILE *f = getfile(arg);
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luaL_arg_check(f, arg, "invalid file handler");
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return f;
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}
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static FILE *getfileparam (char *name, int *arg) {
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FILE *f = getfile(*arg);
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if (f) {
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@ -109,23 +117,26 @@ static FILE *getfileparam (char *name, int *arg) {
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}
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static void getmode (char mode, char *m) {
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m[0] = mode;
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if (*luaL_opt_string(FIRSTARG+1, "text") == 'b') {
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m[1] = 'b';
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m[2] = '\0';
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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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if (pclose(f) == -1)
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fclose(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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else m[1] = '\0';
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}
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static void closefile (char *name) {
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FILE *f = getfilebyname(name);
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if (f == stdin || f == stdout) return;
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if (pclose(f) == -1)
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fclose(f);
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lua_pushobject(lua_getglobal(name));
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lua_settag(gettag(CLOSEDTAG));
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static void io_close (void) {
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closefile(getnonullfile(1));
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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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if (f) lua_pushusertag(f, gettag());
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else pushresult(0);
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}
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@ -136,7 +147,7 @@ static void setfile (FILE *f, char *name, int tag) {
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static void setreturn (FILE *f, char *name) {
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int tag = gettag(IOTAG);
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int tag = gettag();
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setfile(f, name, tag);
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lua_pushusertag(f, tag);
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}
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@ -144,18 +155,16 @@ 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(FIRSTARG);
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lua_Object f = lua_getparam(1);
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if (f == LUA_NOOBJECT) {
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closefile(FINPUT);
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closefile(getfilebyname(FINPUT));
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current = stdin;
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}
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else if (lua_tag(f) == gettag(IOTAG))
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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(FIRSTARG);
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char m[MODESIZE];
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getmode('r', m);
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current = (*s == '|') ? popen(s+1, "r") : fopen(s, m);
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char *s = luaL_check_string(1);
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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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return;
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@ -167,18 +176,16 @@ 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(FIRSTARG);
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lua_Object f = lua_getparam(1);
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if (f == LUA_NOOBJECT) {
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closefile(FOUTPUT);
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closefile(getfilebyname(FOUTPUT));
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current = stdout;
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}
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else if (lua_tag(f) == gettag(IOTAG))
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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(FIRSTARG);
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char m[MODESIZE];
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getmode('w', m);
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current = (*s == '|') ? popen(s+1,"w") : fopen(s, m);
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char *s = luaL_check_string(1);
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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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return;
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@ -189,11 +196,7 @@ static void io_writeto (void) {
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static void io_appendto (void) {
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char *s = luaL_check_string(FIRSTARG);
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char m[MODESIZE];
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FILE *fp;
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getmode('a', m);
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fp = fopen (s, m);
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FILE *fp = fopen(luaL_check_string(1), "a");
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if (fp != NULL)
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setreturn(fp, FOUTPUT);
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else
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@ -298,7 +301,7 @@ 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 = FIRSTARG;
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int arg = 1;
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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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@ -332,7 +335,7 @@ static void io_read (void) {
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static void io_write (void) {
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int arg = FIRSTARG;
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int arg = 1;
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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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@ -346,11 +349,10 @@ 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 = getfile(FIRSTARG-1+1);
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int op = luaL_findstring(luaL_opt_string(FIRSTARG-1+2, "cur"), modenames);
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long offset = luaL_opt_long(FIRSTARG-1+3, 0);
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luaL_arg_check(f, FIRSTARG-1+1, "invalid file handler");
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luaL_arg_check(op != -1, FIRSTARG-1+2, "invalid mode");
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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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op = fseek(f, offset, mode[op]);
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if (op)
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pushresult(0); /* error */
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@ -360,8 +362,8 @@ static void io_seek (void) {
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static void io_flush (void) {
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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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FILE *f = getfile(1);
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luaL_arg_check(f || lua_getparam(1) == LUA_NOOBJECT, 1,
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"invalid file handler");
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pushresult(fflush(f) == 0);
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}
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@ -444,8 +446,9 @@ static void io_debug (void) {
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for (;;) {
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char buffer[250];
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fprintf(stderr, "lua_debug> ");
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if (fgets(buffer, sizeof(buffer), stdin) == 0) return;
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if (strcmp(buffer, "cont\n") == 0) return;
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if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
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strcmp(buffer, "cont\n") == 0)
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return;
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lua_dostring(buffer);
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}
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}
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@ -512,49 +515,43 @@ static void errorfb (void) {
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static struct luaL_reg iolib[] = {
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{"setlocale", setloc},
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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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{"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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{"tmpname", io_tmpname},
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{"getenv", io_getenv},
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{"date", io_date},
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{"clock", io_clock},
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{"exit", io_exit},
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{"debug", io_debug},
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{"_ERRORMESSAGE", errorfb}
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};
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static struct luaL_reg iolibtag[] = {
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{"readfrom", io_readfrom},
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{"writeto", io_writeto},
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{"appendto", io_appendto},
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{"flush", io_flush},
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{"read", io_read},
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{"seek", io_seek},
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{"write", io_write}
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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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static void openwithtags (void) {
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void lua_iolibopen (void) {
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int iotag = lua_newtag();
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int closedtag = lua_newtag();
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int i;
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for (i=0; i<sizeof(iolibtag)/sizeof(iolibtag[0]); i++) {
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/* put both tags as upvalues for these functions */
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lua_pushnumber(iotag);
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lua_pushnumber(closedtag);
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lua_pushcclosure(iolibtag[i].func, 2);
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lua_setglobal(iolibtag[i].name);
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}
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lua_newtag(); /* alloc CLOSEDTAG: assume that CLOSEDTAG = iotag-1 */
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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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}
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void lua_iolibopen (void) {
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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_pushcfunction(io_close); 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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openwithtags();
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}
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