Mercurial > vba-clojure
view src/lua/liolib.c @ 452:56b53bac9c24
removed overlapping notes in drum track.
author | Robert McIntyre <rlm@mit.edu> |
---|---|
date | Thu, 03 May 2012 06:57:41 -0500 (2012-05-03) |
parents | 27763b933818 |
children |
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1 /*2 ** $Id: liolib.c,v 2.73.1.3 2008/01/18 17:47:43 roberto Exp $3 ** Standard I/O (and system) library4 ** See Copyright Notice in lua.h5 */8 #include <errno.h>9 #include <stdio.h>10 #include <stdlib.h>11 #include <string.h>13 #define liolib_c14 #define LUA_LIB16 #include "lua.h"18 #include "lauxlib.h"19 #include "lualib.h"23 #define IO_INPUT 124 #define IO_OUTPUT 227 static const char *const fnames[] = {"input", "output"};30 static int pushresult (lua_State *L, int i, const char *filename) {31 int en = errno; /* calls to Lua API may change this value */32 if (i) {33 lua_pushboolean(L, 1);34 return 1;35 }36 else {37 lua_pushnil(L);38 if (filename)39 lua_pushfstring(L, "%s: %s", filename, strerror(en));40 else41 lua_pushfstring(L, "%s", strerror(en));42 lua_pushinteger(L, en);43 return 3;44 }45 }48 static void fileerror (lua_State *L, int arg, const char *filename) {49 lua_pushfstring(L, "%s: %s", filename, strerror(errno));50 luaL_argerror(L, arg, lua_tostring(L, -1));51 }54 #define tofilep(L) ((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))57 static int io_type (lua_State *L) {58 void *ud;59 luaL_checkany(L, 1);60 ud = lua_touserdata(L, 1);61 lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);62 if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))63 lua_pushnil(L); /* not a file */64 else if (*((FILE **)ud) == NULL)65 lua_pushliteral(L, "closed file");66 else67 lua_pushliteral(L, "file");68 return 1;69 }72 static FILE *tofile (lua_State *L) {73 FILE **f = tofilep(L);74 if (*f == NULL)75 luaL_error(L, "attempt to use a closed file");76 return *f;77 }81 /*82 ** When creating file handles, always creates a `closed' file handle83 ** before opening the actual file; so, if there is a memory error, the84 ** file is not left opened.85 */86 static FILE **newfile (lua_State *L) {87 FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));88 *pf = NULL; /* file handle is currently `closed' */89 luaL_getmetatable(L, LUA_FILEHANDLE);90 lua_setmetatable(L, -2);91 return pf;92 }95 /*96 ** function to (not) close the standard files stdin, stdout, and stderr97 */98 static int io_noclose (lua_State *L) {99 lua_pushnil(L);100 lua_pushliteral(L, "cannot close standard file");101 return 2;102 }105 /*106 ** function to close 'popen' files107 */108 static int io_pclose (lua_State *L) {109 FILE **p = tofilep(L);110 int ok = lua_pclose(L, *p);111 *p = NULL;112 return pushresult(L, ok, NULL);113 }116 /*117 ** function to close regular files118 */119 static int io_fclose (lua_State *L) {120 FILE **p = tofilep(L);121 int ok = (fclose(*p) == 0);122 *p = NULL;123 return pushresult(L, ok, NULL);124 }127 static int aux_close (lua_State *L) {128 lua_getfenv(L, 1);129 lua_getfield(L, -1, "__close");130 return (lua_tocfunction(L, -1))(L);131 }134 static int io_close (lua_State *L) {135 if (lua_isnone(L, 1))136 lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);137 tofile(L); /* make sure argument is a file */138 return aux_close(L);139 }142 static int io_gc (lua_State *L) {143 FILE *f = *tofilep(L);144 /* ignore closed files */145 if (f != NULL)146 aux_close(L);147 return 0;148 }151 static int io_tostring (lua_State *L) {152 FILE *f = *tofilep(L);153 if (f == NULL)154 lua_pushliteral(L, "file (closed)");155 else156 lua_pushfstring(L, "file (%p)", f);157 return 1;158 }161 static int io_open (lua_State *L) {162 const char *filename = luaL_checkstring(L, 1);163 const char *mode = luaL_optstring(L, 2, "r");164 FILE **pf = newfile(L);165 *pf = fopen(filename, mode);166 return (*pf == NULL) ? pushresult(L, 0, filename) : 1;167 }170 /*171 ** this function has a separated environment, which defines the172 ** correct __close for 'popen' files173 */174 static int io_popen (lua_State *L) {175 const char *filename = luaL_checkstring(L, 1);176 const char *mode = luaL_optstring(L, 2, "r");177 FILE **pf = newfile(L);178 *pf = lua_popen(L, filename, mode);179 return (*pf == NULL) ? pushresult(L, 0, filename) : 1;180 }183 static int io_tmpfile (lua_State *L) {184 FILE **pf = newfile(L);185 *pf = tmpfile();186 return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;187 }190 static FILE *getiofile (lua_State *L, int findex) {191 FILE *f;192 lua_rawgeti(L, LUA_ENVIRONINDEX, findex);193 f = *(FILE **)lua_touserdata(L, -1);194 if (f == NULL)195 luaL_error(L, "standard %s file is closed", fnames[findex - 1]);196 return f;197 }200 static int g_iofile (lua_State *L, int f, const char *mode) {201 if (!lua_isnoneornil(L, 1)) {202 const char *filename = lua_tostring(L, 1);203 if (filename) {204 FILE **pf = newfile(L);205 *pf = fopen(filename, mode);206 if (*pf == NULL)207 fileerror(L, 1, filename);208 }209 else {210 tofile(L); /* check that it's a valid file handle */211 lua_pushvalue(L, 1);212 }213 lua_rawseti(L, LUA_ENVIRONINDEX, f);214 }215 /* return current value */216 lua_rawgeti(L, LUA_ENVIRONINDEX, f);217 return 1;218 }221 static int io_input (lua_State *L) {222 return g_iofile(L, IO_INPUT, "r");223 }226 static int io_output (lua_State *L) {227 return g_iofile(L, IO_OUTPUT, "w");228 }231 static int io_readline (lua_State *L);234 static void aux_lines (lua_State *L, int idx, int toclose) {235 lua_pushvalue(L, idx);236 lua_pushboolean(L, toclose); /* close/not close file when finished */237 lua_pushcclosure(L, io_readline, 2);238 }241 static int f_lines (lua_State *L) {242 tofile(L); /* check that it's a valid file handle */243 aux_lines(L, 1, 0);244 return 1;245 }248 static int io_lines (lua_State *L) {249 if (lua_isnoneornil(L, 1)) { /* no arguments? */250 /* will iterate over default input */251 lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);252 return f_lines(L);253 }254 else {255 const char *filename = luaL_checkstring(L, 1);256 FILE **pf = newfile(L);257 *pf = fopen(filename, "r");258 if (*pf == NULL)259 fileerror(L, 1, filename);260 aux_lines(L, lua_gettop(L), 1);261 return 1;262 }263 }266 /*267 ** {======================================================268 ** READ269 ** =======================================================270 */273 static int read_number (lua_State *L, FILE *f) {274 lua_Number d;275 if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {276 lua_pushnumber(L, d);277 return 1;278 }279 else return 0; /* read fails */280 }283 static int test_eof (lua_State *L, FILE *f) {284 int c = getc(f);285 ungetc(c, f);286 lua_pushlstring(L, NULL, 0);287 return (c != EOF);288 }291 static int read_line (lua_State *L, FILE *f) {292 luaL_Buffer b;293 luaL_buffinit(L, &b);294 for (;;) {295 size_t l;296 char *p = luaL_prepbuffer(&b);297 if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */298 luaL_pushresult(&b); /* close buffer */299 return (lua_objlen(L, -1) > 0); /* check whether read something */300 }301 l = strlen(p);302 if (l == 0 || p[l-1] != '\n')303 luaL_addsize(&b, l);304 else {305 luaL_addsize(&b, l - 1); /* do not include `eol' */306 luaL_pushresult(&b); /* close buffer */307 return 1; /* read at least an `eol' */308 }309 }310 }313 static int read_chars (lua_State *L, FILE *f, size_t n) {314 size_t rlen; /* how much to read */315 size_t nr; /* number of chars actually read */316 luaL_Buffer b;317 luaL_buffinit(L, &b);318 rlen = LUAL_BUFFERSIZE; /* try to read that much each time */319 do {320 char *p = luaL_prepbuffer(&b);321 if (rlen > n) rlen = n; /* cannot read more than asked */322 nr = fread(p, sizeof(char), rlen, f);323 luaL_addsize(&b, nr);324 n -= nr; /* still have to read `n' chars */325 } while (n > 0 && nr == rlen); /* until end of count or eof */326 luaL_pushresult(&b); /* close buffer */327 return (n == 0 || lua_objlen(L, -1) > 0);328 }331 static int g_read (lua_State *L, FILE *f, int first) {332 int nargs = lua_gettop(L) - 1;333 int success;334 int n;335 clearerr(f);336 if (nargs == 0) { /* no arguments? */337 success = read_line(L, f);338 n = first+1; /* to return 1 result */339 }340 else { /* ensure stack space for all results and for auxlib's buffer */341 luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");342 success = 1;343 for (n = first; nargs-- && success; n++) {344 if (lua_type(L, n) == LUA_TNUMBER) {345 size_t l = (size_t)lua_tointeger(L, n);346 success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);347 }348 else {349 const char *p = lua_tostring(L, n);350 luaL_argcheck(L, p && p[0] == '*', n, "invalid option");351 switch (p[1]) {352 case 'n': /* number */353 success = read_number(L, f);354 break;355 case 'l': /* line */356 success = read_line(L, f);357 break;358 case 'a': /* file */359 read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */360 success = 1; /* always success */361 break;362 default:363 return luaL_argerror(L, n, "invalid format");364 }365 }366 }367 }368 if (ferror(f))369 return pushresult(L, 0, NULL);370 if (!success) {371 lua_pop(L, 1); /* remove last result */372 lua_pushnil(L); /* push nil instead */373 }374 return n - first;375 }378 static int io_read (lua_State *L) {379 return g_read(L, getiofile(L, IO_INPUT), 1);380 }383 static int f_read (lua_State *L) {384 return g_read(L, tofile(L), 2);385 }388 static int io_readline (lua_State *L) {389 FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));390 int sucess;391 if (f == NULL) /* file is already closed? */392 luaL_error(L, "file is already closed");393 sucess = read_line(L, f);394 if (ferror(f))395 return luaL_error(L, "%s", strerror(errno));396 if (sucess) return 1;397 else { /* EOF */398 if (lua_toboolean(L, lua_upvalueindex(2))) { /* generator created file? */399 lua_settop(L, 0);400 lua_pushvalue(L, lua_upvalueindex(1));401 aux_close(L); /* close it */402 }403 return 0;404 }405 }407 /* }====================================================== */410 static int g_write (lua_State *L, FILE *f, int arg) {411 int nargs = lua_gettop(L) - 1;412 int status = 1;413 for (; nargs--; arg++) {414 if (lua_type(L, arg) == LUA_TNUMBER) {415 /* optimization: could be done exactly as for strings */416 status = status &&417 fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;418 }419 else {420 size_t l;421 const char *s = luaL_checklstring(L, arg, &l);422 status = status && (fwrite(s, sizeof(char), l, f) == l);423 }424 }425 return pushresult(L, status, NULL);426 }429 static int io_write (lua_State *L) {430 return g_write(L, getiofile(L, IO_OUTPUT), 1);431 }434 static int f_write (lua_State *L) {435 return g_write(L, tofile(L), 2);436 }439 static int f_seek (lua_State *L) {440 static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};441 static const char *const modenames[] = {"set", "cur", "end", NULL};442 FILE *f = tofile(L);443 int op = luaL_checkoption(L, 2, "cur", modenames);444 long offset = luaL_optlong(L, 3, 0);445 op = fseek(f, offset, mode[op]);446 if (op)447 return pushresult(L, 0, NULL); /* error */448 else {449 lua_pushinteger(L, ftell(f));450 return 1;451 }452 }455 static int f_setvbuf (lua_State *L) {456 static const int mode[] = {_IONBF, _IOFBF, _IOLBF};457 static const char *const modenames[] = {"no", "full", "line", NULL};458 FILE *f = tofile(L);459 int op = luaL_checkoption(L, 2, NULL, modenames);460 lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);461 int res = setvbuf(f, NULL, mode[op], sz);462 return pushresult(L, res == 0, NULL);463 }467 static int io_flush (lua_State *L) {468 return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);469 }472 static int f_flush (lua_State *L) {473 return pushresult(L, fflush(tofile(L)) == 0, NULL);474 }477 static const luaL_Reg iolib[] = {478 {"close", io_close},479 {"flush", io_flush},480 {"input", io_input},481 {"lines", io_lines},482 {"open", io_open},483 {"output", io_output},484 {"popen", io_popen},485 {"read", io_read},486 {"tmpfile", io_tmpfile},487 {"type", io_type},488 {"write", io_write},489 {NULL, NULL}490 };493 static const luaL_Reg flib[] = {494 {"close", io_close},495 {"flush", f_flush},496 {"lines", f_lines},497 {"read", f_read},498 {"seek", f_seek},499 {"setvbuf", f_setvbuf},500 {"write", f_write},501 {"__gc", io_gc},502 {"__tostring", io_tostring},503 {NULL, NULL}504 };507 static void createmeta (lua_State *L) {508 luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */509 lua_pushvalue(L, -1); /* push metatable */510 lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */511 luaL_register(L, NULL, flib); /* file methods */512 }515 static void createstdfile (lua_State *L, FILE *f, int k, const char *fname) {516 *newfile(L) = f;517 if (k > 0) {518 lua_pushvalue(L, -1);519 lua_rawseti(L, LUA_ENVIRONINDEX, k);520 }521 lua_pushvalue(L, -2); /* copy environment */522 lua_setfenv(L, -2); /* set it */523 lua_setfield(L, -3, fname);524 }527 static void newfenv (lua_State *L, lua_CFunction cls) {528 lua_createtable(L, 0, 1);529 lua_pushcfunction(L, cls);530 lua_setfield(L, -2, "__close");531 }534 LUALIB_API int luaopen_io (lua_State *L) {535 createmeta(L);536 /* create (private) environment (with fields IO_INPUT, IO_OUTPUT, __close) */537 newfenv(L, io_fclose);538 lua_replace(L, LUA_ENVIRONINDEX);539 /* open library */540 luaL_register(L, LUA_IOLIBNAME, iolib);541 /* create (and set) default files */542 newfenv(L, io_noclose); /* close function for default files */543 createstdfile(L, stdin, IO_INPUT, "stdin");544 createstdfile(L, stdout, IO_OUTPUT, "stdout");545 createstdfile(L, stderr, 0, "stderr");546 lua_pop(L, 1); /* pop environment for default files */547 lua_getfield(L, -1, "popen");548 newfenv(L, io_pclose); /* create environment for 'popen' */549 lua_setfenv(L, -2); /* set fenv for 'popen' */550 lua_pop(L, 1); /* pop 'popen' */551 return 1;552 }