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authorRoberto Ierusalimschy <roberto@inf.puc-rio.br>1999-03-16 17:07:54 -0300
committerRoberto Ierusalimschy <roberto@inf.puc-rio.br>1999-03-16 17:07:54 -0300
commitd6ff06751af3e52ae1e0e1697021fe884f104fc8 (patch)
tree17c2b0837d6ee3e78c3bd982f98d00cbf58f4681 /liolib.c
parent7a11c7f8e4a9913aa74fce8d1b395cac4b45de92 (diff)
downloadlua-d6ff06751af3e52ae1e0e1697021fe884f104fc8.tar.gz
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new functions openfile and closefile;
new way to keep file handle tags.
Diffstat (limited to '')
-rw-r--r--liolib.c161
1 files changed, 79 insertions, 82 deletions
diff --git a/liolib.c b/liolib.c
index e23265dc..730e2be2 100644
--- a/liolib.c
+++ b/liolib.c
@@ -1,5 +1,5 @@
1/* 1/*
2** $Id: liolib.c,v 1.33 1999/03/05 20:45:01 roberto Exp roberto $ 2** $Id: liolib.c,v 1.34 1999/03/11 18:59:19 roberto Exp roberto $
3** Standard I/O (and system) library 3** Standard I/O (and system) library
4** See Copyright Notice in lua.h 4** See Copyright Notice in lua.h
5*/ 5*/
@@ -32,10 +32,8 @@
32#endif 32#endif
33 33
34 34
35#define CLOSEDTAG 2 35#define CLOSEDTAG(tag) ((tag)-1)
36#define IOTAG 1
37 36
38#define FIRSTARG 3 /* 1st and 2nd are upvalues */
39 37
40#define FINPUT "_INPUT" 38#define FINPUT "_INPUT"
41#define FOUTPUT "_OUTPUT" 39#define FOUTPUT "_OUTPUT"
@@ -70,20 +68,23 @@ static void pushresult (int i) {
70** ======================================================= 68** =======================================================
71*/ 69*/
72 70
73static int gettag (int i) { 71static int gettag (void) {
74 return (int)lua_getnumber(lua_getparam(i)); 72 lua_pushusertag(stdin, LUA_ANYTAG);
73 return lua_tag(lua_pop()); /* get the tag of stdin */
75} 74}
76 75
77 76
78static int ishandler (lua_Object f) { 77static int ishandler (lua_Object f) {
79 if (lua_isuserdata(f)) { 78 if (lua_isuserdata(f)) {
80 if (lua_tag(f) == gettag(CLOSEDTAG)) 79 int tag = gettag();
80 if (lua_tag(f) == CLOSEDTAG(tag))
81 lua_error("cannot access a closed file"); 81 lua_error("cannot access a closed file");
82 return lua_tag(f) == gettag(IOTAG); 82 return lua_tag(f) == tag;
83 } 83 }
84 else return 0; 84 else return 0;
85} 85}
86 86
87
87static FILE *getfilebyname (char *name) { 88static FILE *getfilebyname (char *name) {
88 lua_Object f = lua_getglobal(name); 89 lua_Object f = lua_getglobal(name);
89 if (!ishandler(f)) 90 if (!ishandler(f))
@@ -98,6 +99,13 @@ static FILE *getfile (int arg) {
98} 99}
99 100
100 101
102static FILE *getnonullfile (int arg) {
103 FILE *f = getfile(arg);
104 luaL_arg_check(f, arg, "invalid file handler");
105 return f;
106}
107
108
101static FILE *getfileparam (char *name, int *arg) { 109static FILE *getfileparam (char *name, int *arg) {
102 FILE *f = getfile(*arg); 110 FILE *f = getfile(*arg);
103 if (f) { 111 if (f) {
@@ -109,23 +117,26 @@ static FILE *getfileparam (char *name, int *arg) {
109} 117}
110 118
111 119
112static void getmode (char mode, char *m) { 120static void closefile (FILE *f) {
113 m[0] = mode; 121 if (f != stdin && f != stdout) {
114 if (*luaL_opt_string(FIRSTARG+1, "text") == 'b') { 122 int tag = gettag();
115 m[1] = 'b'; 123 if (pclose(f) == -1)
116 m[2] = '\0'; 124 fclose(f);
125 lua_pushusertag(f, tag);
126 lua_settag(CLOSEDTAG(tag));
117 } 127 }
118 else m[1] = '\0';
119} 128}
120 129
121 130
122static void closefile (char *name) { 131static void io_close (void) {
123 FILE *f = getfilebyname(name); 132 closefile(getnonullfile(1));
124 if (f == stdin || f == stdout) return; 133}
125 if (pclose(f) == -1) 134
126 fclose(f); 135
127 lua_pushobject(lua_getglobal(name)); 136static void io_open (void) {
128 lua_settag(gettag(CLOSEDTAG)); 137 FILE *f = fopen(luaL_check_string(1), luaL_check_string(2));
138 if (f) lua_pushusertag(f, gettag());
139 else pushresult(0);
129} 140}
130 141
131 142
@@ -136,7 +147,7 @@ static void setfile (FILE *f, char *name, int tag) {
136 147
137 148
138static void setreturn (FILE *f, char *name) { 149static void setreturn (FILE *f, char *name) {
139 int tag = gettag(IOTAG); 150 int tag = gettag();
140 setfile(f, name, tag); 151 setfile(f, name, tag);
141 lua_pushusertag(f, tag); 152 lua_pushusertag(f, tag);
142} 153}
@@ -144,18 +155,16 @@ static void setreturn (FILE *f, char *name) {
144 155
145static void io_readfrom (void) { 156static void io_readfrom (void) {
146 FILE *current; 157 FILE *current;
147 lua_Object f = lua_getparam(FIRSTARG); 158 lua_Object f = lua_getparam(1);
148 if (f == LUA_NOOBJECT) { 159 if (f == LUA_NOOBJECT) {
149 closefile(FINPUT); 160 closefile(getfilebyname(FINPUT));
150 current = stdin; 161 current = stdin;
151 } 162 }
152 else if (lua_tag(f) == gettag(IOTAG)) 163 else if (lua_tag(f) == gettag()) /* deprecated option */
153 current = lua_getuserdata(f); 164 current = lua_getuserdata(f);
154 else { 165 else {
155 char *s = luaL_check_string(FIRSTARG); 166 char *s = luaL_check_string(1);
156 char m[MODESIZE]; 167 current = (*s == '|') ? popen(s+1, "r") : fopen(s, "r");
157 getmode('r', m);
158 current = (*s == '|') ? popen(s+1, "r") : fopen(s, m);
159 if (current == NULL) { 168 if (current == NULL) {
160 pushresult(0); 169 pushresult(0);
161 return; 170 return;
@@ -167,18 +176,16 @@ static void io_readfrom (void) {
167 176
168static void io_writeto (void) { 177static void io_writeto (void) {
169 FILE *current; 178 FILE *current;
170 lua_Object f = lua_getparam(FIRSTARG); 179 lua_Object f = lua_getparam(1);
171 if (f == LUA_NOOBJECT) { 180 if (f == LUA_NOOBJECT) {
172 closefile(FOUTPUT); 181 closefile(getfilebyname(FOUTPUT));
173 current = stdout; 182 current = stdout;
174 } 183 }
175 else if (lua_tag(f) == gettag(IOTAG)) 184 else if (lua_tag(f) == gettag()) /* deprecated option */
176 current = lua_getuserdata(f); 185 current = lua_getuserdata(f);
177 else { 186 else {
178 char *s = luaL_check_string(FIRSTARG); 187 char *s = luaL_check_string(1);
179 char m[MODESIZE]; 188 current = (*s == '|') ? popen(s+1,"w") : fopen(s, "w");
180 getmode('w', m);
181 current = (*s == '|') ? popen(s+1,"w") : fopen(s, m);
182 if (current == NULL) { 189 if (current == NULL) {
183 pushresult(0); 190 pushresult(0);
184 return; 191 return;
@@ -189,11 +196,7 @@ static void io_writeto (void) {
189 196
190 197
191static void io_appendto (void) { 198static void io_appendto (void) {
192 char *s = luaL_check_string(FIRSTARG); 199 FILE *fp = fopen(luaL_check_string(1), "a");
193 char m[MODESIZE];
194 FILE *fp;
195 getmode('a', m);
196 fp = fopen (s, m);
197 if (fp != NULL) 200 if (fp != NULL)
198 setreturn(fp, FOUTPUT); 201 setreturn(fp, FOUTPUT);
199 else 202 else
@@ -298,7 +301,7 @@ static void read_file (FILE *f) {
298 301
299static void io_read (void) { 302static void io_read (void) {
300 static char *options[] = {"*n", "*l", "*a", ".*", "*w", NULL}; 303 static char *options[] = {"*n", "*l", "*a", ".*", "*w", NULL};
301 int arg = FIRSTARG; 304 int arg = 1;
302 FILE *f = getfileparam(FINPUT, &arg); 305 FILE *f = getfileparam(FINPUT, &arg);
303 char *p = luaL_opt_string(arg++, "*l"); 306 char *p = luaL_opt_string(arg++, "*l");
304 do { /* repeat for each part */ 307 do { /* repeat for each part */
@@ -332,7 +335,7 @@ static void io_read (void) {
332 335
333 336
334static void io_write (void) { 337static void io_write (void) {
335 int arg = FIRSTARG; 338 int arg = 1;
336 FILE *f = getfileparam(FOUTPUT, &arg); 339 FILE *f = getfileparam(FOUTPUT, &arg);
337 int status = 1; 340 int status = 1;
338 char *s; 341 char *s;
@@ -346,11 +349,10 @@ static void io_write (void) {
346static void io_seek (void) { 349static void io_seek (void) {
347 static int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END}; 350 static int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
348 static char *modenames[] = {"set", "cur", "end", NULL}; 351 static char *modenames[] = {"set", "cur", "end", NULL};
349 FILE *f = getfile(FIRSTARG-1+1); 352 FILE *f = getnonullfile(1);
350 int op = luaL_findstring(luaL_opt_string(FIRSTARG-1+2, "cur"), modenames); 353 int op = luaL_findstring(luaL_opt_string(2, "cur"), modenames);
351 long offset = luaL_opt_long(FIRSTARG-1+3, 0); 354 long offset = luaL_opt_long(3, 0);
352 luaL_arg_check(f, FIRSTARG-1+1, "invalid file handler"); 355 luaL_arg_check(op != -1, 2, "invalid mode");
353 luaL_arg_check(op != -1, FIRSTARG-1+2, "invalid mode");
354 op = fseek(f, offset, mode[op]); 356 op = fseek(f, offset, mode[op]);
355 if (op) 357 if (op)
356 pushresult(0); /* error */ 358 pushresult(0); /* error */
@@ -360,8 +362,8 @@ static void io_seek (void) {
360 362
361 363
362static void io_flush (void) { 364static void io_flush (void) {
363 FILE *f = getfile(FIRSTARG); 365 FILE *f = getfile(1);
364 luaL_arg_check(f || lua_getparam(FIRSTARG) == LUA_NOOBJECT, FIRSTARG, 366 luaL_arg_check(f || lua_getparam(1) == LUA_NOOBJECT, 1,
365 "invalid file handler"); 367 "invalid file handler");
366 pushresult(fflush(f) == 0); 368 pushresult(fflush(f) == 0);
367} 369}
@@ -444,8 +446,9 @@ static void io_debug (void) {
444 for (;;) { 446 for (;;) {
445 char buffer[250]; 447 char buffer[250];
446 fprintf(stderr, "lua_debug> "); 448 fprintf(stderr, "lua_debug> ");
447 if (fgets(buffer, sizeof(buffer), stdin) == 0) return; 449 if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
448 if (strcmp(buffer, "cont\n") == 0) return; 450 strcmp(buffer, "cont\n") == 0)
451 return;
449 lua_dostring(buffer); 452 lua_dostring(buffer);
450 } 453 }
451} 454}
@@ -512,49 +515,43 @@ static void errorfb (void) {
512 515
513 516
514static struct luaL_reg iolib[] = { 517static struct luaL_reg iolib[] = {
515 {"setlocale", setloc}, 518 {"_ERRORMESSAGE", errorfb},
516 {"execute", io_execute}, 519 {"appendto", io_appendto},
517 {"remove", io_remove},
518 {"rename", io_rename},
519 {"tmpname", io_tmpname},
520 {"getenv", io_getenv},
521 {"date", io_date},
522 {"clock", io_clock}, 520 {"clock", io_clock},
523 {"exit", io_exit}, 521 {"closefile", io_close},
522 {"date", io_date},
524 {"debug", io_debug}, 523 {"debug", io_debug},
525 {"_ERRORMESSAGE", errorfb} 524 {"execute", io_execute},
526}; 525 {"exit", io_exit},
527
528static struct luaL_reg iolibtag[] = {
529 {"readfrom", io_readfrom},
530 {"writeto", io_writeto},
531 {"appendto", io_appendto},
532 {"flush", io_flush}, 526 {"flush", io_flush},
527 {"getenv", io_getenv},
528 {"openfile", io_open},
533 {"read", io_read}, 529 {"read", io_read},
530 {"readfrom", io_readfrom},
531 {"remove", io_remove},
532 {"rename", io_rename},
534 {"seek", io_seek}, 533 {"seek", io_seek},
535 {"write", io_write} 534 {"setlocale", setloc},
535 {"tmpname", io_tmpname},
536 {"write", io_write},
537 {"writeto", io_writeto}
536}; 538};
537 539
538static void openwithtags (void) { 540
541void lua_iolibopen (void) {
539 int iotag = lua_newtag(); 542 int iotag = lua_newtag();
540 int closedtag = lua_newtag(); 543 lua_newtag(); /* alloc CLOSEDTAG: assume that CLOSEDTAG = iotag-1 */
541 int i; 544 /* predefined file handles */
542 for (i=0; i<sizeof(iolibtag)/sizeof(iolibtag[0]); i++) {
543 /* put both tags as upvalues for these functions */
544 lua_pushnumber(iotag);
545 lua_pushnumber(closedtag);
546 lua_pushcclosure(iolibtag[i].func, 2);
547 lua_setglobal(iolibtag[i].name);
548 }
549 setfile(stdin, FINPUT, iotag); 545 setfile(stdin, FINPUT, iotag);
550 setfile(stdout, FOUTPUT, iotag); 546 setfile(stdout, FOUTPUT, iotag);
551 setfile(stdin, "_STDIN", iotag); 547 setfile(stdin, "_STDIN", iotag);
552 setfile(stdout, "_STDOUT", iotag); 548 setfile(stdout, "_STDOUT", iotag);
553 setfile(stderr, "_STDERR", iotag); 549 setfile(stderr, "_STDERR", iotag);
554} 550 /* make sure stdin (with its tag) won't be collected */
555 551 lua_pushusertag(stdin, iotag); lua_ref(1);
556void lua_iolibopen (void) { 552 /* close file when collected */
553 lua_pushcfunction(io_close); lua_settagmethod(iotag, "gc");
554 /* register lib functions */
557 luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0]))); 555 luaL_openlib(iolib, (sizeof(iolib)/sizeof(iolib[0])));
558 openwithtags();
559} 556}
560 557
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