1 /*- 2 * Copyright (c) 2014 Pedro Souza <pedrosouza@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 33 #include "lua.h" 34 #include "lauxlib.h" 35 #include "lstd.h" 36 #include "lutils.h" 37 #include "bootstrap.h" 38 39 /* 40 * Like loader.perform, except args are passed already parsed 41 * on the stack. 42 */ 43 static int 44 lua_command(lua_State *L) 45 { 46 int i; 47 int res = 1; 48 int argc = lua_gettop(L); 49 char **argv; 50 51 argv = malloc(sizeof(char *) * (argc + 1)); 52 if (argv == NULL) 53 return 0; 54 for (i = 0; i < argc; i++) 55 argv[i] = (char *)(intptr_t)luaL_checkstring(L, i + 1); 56 argv[argc] = NULL; 57 res = interp_builtin_cmd(argc, argv); 58 free(argv); 59 lua_pushinteger(L, res); 60 61 return 1; 62 } 63 64 static int 65 lua_perform(lua_State *L) 66 { 67 int argc; 68 char **argv; 69 int res = 1; 70 71 if (parse(&argc, &argv, luaL_checkstring(L, 1)) == 0) { 72 res = interp_builtin_cmd(argc, argv); 73 free(argv); 74 } 75 lua_pushinteger(L, res); 76 77 return 1; 78 } 79 80 /* 81 * Accepts a space-delimited loader command and runs it through the standard 82 * loader parsing, as if it were executed at the loader prompt by the user. 83 */ 84 static int 85 lua_interpret(lua_State *L) 86 { 87 const char *interp_string; 88 89 if (lua_gettop(L) != 1) { 90 lua_pushnil(L); 91 return 1; 92 } 93 94 interp_string = luaL_checkstring(L, 1); 95 lua_pushinteger(L, interp_run(interp_string)); 96 return 1; 97 } 98 99 static int 100 lua_parse(lua_State *L) 101 { 102 int argc, nargc; 103 char **argv; 104 105 if (parse(&argc, &argv, luaL_checkstring(L, 1)) == 0) { 106 for (nargc = 0; nargc < argc; ++nargc) { 107 lua_pushstring(L, argv[nargc]); 108 } 109 free(argv); 110 return nargc; 111 } 112 113 lua_pushnil(L); 114 return 1; 115 } 116 117 static int 118 lua_getchar(lua_State *L) 119 { 120 121 lua_pushinteger(L, getchar()); 122 return 1; 123 } 124 125 static int 126 lua_ischar(lua_State *L) 127 { 128 129 lua_pushboolean(L, ischar()); 130 return 1; 131 } 132 133 static int 134 lua_gets(lua_State *L) 135 { 136 char buf[129]; 137 138 ngets(buf, 128); 139 lua_pushstring(L, buf); 140 return 1; 141 } 142 143 static int 144 lua_time(lua_State *L) 145 { 146 147 lua_pushinteger(L, time(NULL)); 148 return 1; 149 } 150 151 static int 152 lua_delay(lua_State *L) 153 { 154 155 delay((int)luaL_checknumber(L, 1)); 156 return 0; 157 } 158 159 static int 160 lua_getenv(lua_State *L) 161 { 162 lua_pushstring(L, getenv(luaL_checkstring(L, 1))); 163 164 return 1; 165 } 166 167 static int 168 lua_setenv(lua_State *L) 169 { 170 const char *key, *val; 171 172 key = luaL_checkstring(L, 1); 173 val = luaL_checkstring(L, 2); 174 lua_pushinteger(L, setenv(key, val, 1)); 175 176 return 1; 177 } 178 179 static int 180 lua_unsetenv(lua_State *L) 181 { 182 const char *ev; 183 184 ev = luaL_checkstring(L, 1); 185 lua_pushinteger(L, unsetenv(ev)); 186 187 return 1; 188 } 189 190 static int 191 lua_printc(lua_State *L) 192 { 193 ssize_t cur, l; 194 const char *s = luaL_checklstring(L, 1, &l); 195 196 for (cur = 0; cur < l; ++cur) 197 putchar((unsigned char)*(s++)); 198 199 return 1; 200 } 201 202 static int 203 lua_openfile(lua_State *L) 204 { 205 const char *mode, *str; 206 int nargs; 207 208 nargs = lua_gettop(L); 209 if (nargs < 1 || nargs > 2) { 210 lua_pushnil(L); 211 return 1; 212 } 213 str = lua_tostring(L, 1); 214 mode = "r"; 215 if (nargs > 1) { 216 mode = lua_tostring(L, 2); 217 if (mode == NULL) { 218 lua_pushnil(L); 219 return 1; 220 } 221 } 222 FILE * f = fopen(str, mode); 223 if (f != NULL) { 224 FILE ** ptr = (FILE**)lua_newuserdata(L, sizeof(FILE**)); 225 *ptr = f; 226 } else 227 lua_pushnil(L); 228 return 1; 229 } 230 231 static int 232 lua_closefile(lua_State *L) 233 { 234 FILE ** f; 235 if (lua_gettop(L) != 1) { 236 lua_pushboolean(L, 0); 237 return 1; 238 } 239 240 f = (FILE**)lua_touserdata(L, 1); 241 if (f != NULL && *f != NULL) { 242 lua_pushboolean(L, fclose(*f) == 0 ? 1 : 0); 243 *f = NULL; 244 } else 245 lua_pushboolean(L, 0); 246 247 return 1; 248 } 249 250 static int 251 lua_readfile(lua_State *L) 252 { 253 FILE **f; 254 size_t size, r; 255 char * buf; 256 257 if (lua_gettop(L) < 1 || lua_gettop(L) > 2) { 258 lua_pushnil(L); 259 lua_pushinteger(L, 0); 260 return 2; 261 } 262 263 f = (FILE**)lua_touserdata(L, 1); 264 265 if (f == NULL || *f == NULL) { 266 lua_pushnil(L); 267 lua_pushinteger(L, 0); 268 return 2; 269 } 270 271 if (lua_gettop(L) == 2) 272 size = (size_t)lua_tonumber(L, 2); 273 else 274 size = (*f)->size; 275 276 277 buf = (char*)malloc(size); 278 r = fread(buf, 1, size, *f); 279 lua_pushlstring(L, buf, r); 280 free(buf); 281 lua_pushinteger(L, r); 282 283 return 2; 284 } 285 286 /* 287 * Implements io.write(file, ...) 288 * Any number of string and number arguments may be passed to it, 289 * and it will return the number of bytes written, or nil, an error string, and 290 * the errno. 291 */ 292 static int 293 lua_writefile(lua_State *L) 294 { 295 FILE **f; 296 const char *buf; 297 int i, nargs; 298 size_t bufsz, w, wrsz; 299 300 buf = NULL; 301 bufsz = 0; 302 w = 0; 303 wrsz = 0; 304 nargs = lua_gettop(L); 305 if (nargs < 2) { 306 errno = EINVAL; 307 return luaL_fileresult(L, 0, NULL); 308 } 309 310 f = (FILE**)lua_touserdata(L, 1); 311 312 if (f == NULL || *f == NULL) { 313 errno = EINVAL; 314 return luaL_fileresult(L, 0, NULL); 315 } 316 317 /* Do a validation pass first */ 318 for (i = 0; i < nargs - 1; i++) { 319 /* 320 * With Lua's API, lua_isstring really checks if the argument 321 * is a string or a number. The latter will be implicitly 322 * converted to a string by our later call to lua_tolstring. 323 */ 324 if (!lua_isstring(L, i + 2)) { 325 errno = EINVAL; 326 return luaL_fileresult(L, 0, NULL); 327 } 328 } 329 for (i = 0; i < nargs - 1; i++) { 330 /* We've already validated; there's no chance of failure */ 331 buf = lua_tolstring(L, i + 2, &bufsz); 332 wrsz = fwrite(buf, 1, bufsz, *f); 333 if (wrsz < bufsz) 334 return luaL_fileresult(L, 0, NULL); 335 w += wrsz; 336 } 337 lua_pushinteger(L, w); 338 return 1; 339 } 340 341 #define REG_SIMPLE(n) { #n, lua_ ## n } 342 static const struct luaL_Reg loaderlib[] = { 343 REG_SIMPLE(delay), 344 REG_SIMPLE(command), 345 REG_SIMPLE(interpret), 346 REG_SIMPLE(parse), 347 REG_SIMPLE(getenv), 348 REG_SIMPLE(perform), 349 /* Also registered as the global 'printc' */ 350 REG_SIMPLE(printc), 351 REG_SIMPLE(setenv), 352 REG_SIMPLE(time), 353 REG_SIMPLE(unsetenv), 354 { NULL, NULL }, 355 }; 356 357 static const struct luaL_Reg iolib[] = { 358 { "close", lua_closefile }, 359 REG_SIMPLE(getchar), 360 REG_SIMPLE(gets), 361 REG_SIMPLE(ischar), 362 { "open", lua_openfile }, 363 { "read", lua_readfile }, 364 { "write", lua_writefile }, 365 { NULL, NULL }, 366 }; 367 #undef REG_SIMPLE 368 369 int 370 luaopen_loader(lua_State *L) 371 { 372 luaL_newlib(L, loaderlib); 373 /* Add loader.machine and loader.machine_arch properties */ 374 lua_pushstring(L, MACHINE); 375 lua_setfield(L, -2, "machine"); 376 lua_pushstring(L, MACHINE_ARCH); 377 lua_setfield(L, -2, "machine_arch"); 378 /* Set global printc to loader.printc */ 379 lua_register(L, "printc", lua_printc); 380 return 1; 381 } 382 383 int 384 luaopen_io(lua_State *L) 385 { 386 luaL_newlib(L, iolib); 387 return 1; 388 } 389