| 1 | /* Proxy shell designed for use with Emacs on Windows 95 and NT. |
| 2 | Copyright (C) 1997, 2001-2014 Free Software Foundation, Inc. |
| 3 | |
| 4 | Accepts subset of Unix sh(1) command-line options, for compatibility |
| 5 | with elisp code written for Unix. When possible, executes external |
| 6 | programs directly (a common use of /bin/sh by Emacs), otherwise |
| 7 | invokes the user-specified command processor to handle built-in shell |
| 8 | commands, batch files and interactive mode. |
| 9 | |
| 10 | The main function is simply to process the "-c string" option in the |
| 11 | way /bin/sh does, since the standard Windows command shells use the |
| 12 | convention that everything after "/c" (the Windows equivalent of |
| 13 | "-c") is the input string. |
| 14 | |
| 15 | This file is part of GNU Emacs. |
| 16 | |
| 17 | GNU Emacs is free software: you can redistribute it and/or modify |
| 18 | it under the terms of the GNU General Public License as published by |
| 19 | the Free Software Foundation, either version 3 of the License, or |
| 20 | (at your option) any later version. |
| 21 | |
| 22 | GNU Emacs is distributed in the hope that it will be useful, |
| 23 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | GNU General Public License for more details. |
| 26 | |
| 27 | You should have received a copy of the GNU General Public License |
| 28 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 29 | |
| 30 | #include <windows.h> |
| 31 | |
| 32 | #include <stdarg.h> /* va_args */ |
| 33 | #include <malloc.h> /* alloca */ |
| 34 | #include <stdlib.h> /* getenv */ |
| 35 | #include <string.h> /* strlen */ |
| 36 | #include <ctype.h> /* isspace, isalpha */ |
| 37 | |
| 38 | /* We don't want to include stdio.h because we are already duplicating |
| 39 | lots of it here */ |
| 40 | extern int _snprintf (char *buffer, size_t count, const char *format, ...); |
| 41 | |
| 42 | /******* Mock C library routines *********************************/ |
| 43 | |
| 44 | /* These routines are used primarily to minimize the executable size. */ |
| 45 | |
| 46 | #define stdout GetStdHandle (STD_OUTPUT_HANDLE) |
| 47 | #define stderr GetStdHandle (STD_ERROR_HANDLE) |
| 48 | |
| 49 | int |
| 50 | vfprintf (HANDLE hnd, const char * msg, va_list args) |
| 51 | { |
| 52 | DWORD bytes_written; |
| 53 | char buf[1024]; |
| 54 | |
| 55 | wvsprintf (buf, msg, args); |
| 56 | return WriteFile (hnd, buf, strlen (buf), &bytes_written, NULL); |
| 57 | } |
| 58 | |
| 59 | int |
| 60 | fprintf (HANDLE hnd, const char * msg, ...) |
| 61 | { |
| 62 | va_list args; |
| 63 | int rc; |
| 64 | |
| 65 | va_start (args, msg); |
| 66 | rc = vfprintf (hnd, msg, args); |
| 67 | va_end (args); |
| 68 | |
| 69 | return rc; |
| 70 | } |
| 71 | |
| 72 | int |
| 73 | printf (const char * msg, ...) |
| 74 | { |
| 75 | va_list args; |
| 76 | int rc; |
| 77 | |
| 78 | va_start (args, msg); |
| 79 | rc = vfprintf (stdout, msg, args); |
| 80 | va_end (args); |
| 81 | |
| 82 | return rc; |
| 83 | } |
| 84 | |
| 85 | void |
| 86 | fail (const char * msg, ...) |
| 87 | { |
| 88 | va_list args; |
| 89 | |
| 90 | va_start (args, msg); |
| 91 | vfprintf (stderr, msg, args); |
| 92 | va_end (args); |
| 93 | |
| 94 | exit (-1); |
| 95 | } |
| 96 | |
| 97 | void |
| 98 | warn (const char * msg, ...) |
| 99 | { |
| 100 | va_list args; |
| 101 | |
| 102 | va_start (args, msg); |
| 103 | vfprintf (stderr, msg, args); |
| 104 | va_end (args); |
| 105 | } |
| 106 | |
| 107 | /******************************************************************/ |
| 108 | |
| 109 | char * |
| 110 | canon_filename (char *fname) |
| 111 | { |
| 112 | char *p = fname; |
| 113 | |
| 114 | while (*p) |
| 115 | { |
| 116 | if (*p == '/') |
| 117 | *p = '\\'; |
| 118 | p++; |
| 119 | } |
| 120 | |
| 121 | return fname; |
| 122 | } |
| 123 | |
| 124 | const char * |
| 125 | skip_space (const char *str) |
| 126 | { |
| 127 | while (isspace (*str)) str++; |
| 128 | return str; |
| 129 | } |
| 130 | |
| 131 | const char * |
| 132 | skip_nonspace (const char *str) |
| 133 | { |
| 134 | while (*str && !isspace (*str)) str++; |
| 135 | return str; |
| 136 | } |
| 137 | |
| 138 | int escape_char = '\\'; |
| 139 | |
| 140 | /* Get next token from input, advancing pointer. */ |
| 141 | int |
| 142 | get_next_token (char * buf, const char ** pSrc) |
| 143 | { |
| 144 | const char * p = *pSrc; |
| 145 | char * o = buf; |
| 146 | |
| 147 | p = skip_space (p); |
| 148 | if (*p == '"') |
| 149 | { |
| 150 | int escape_char_run = 0; |
| 151 | |
| 152 | /* Go through src until an ending quote is found, unescaping |
| 153 | quotes along the way. If the escape char is not quote, then do |
| 154 | special handling of multiple escape chars preceding a quote |
| 155 | char (ie. the reverse of what Emacs does to escape quotes). */ |
| 156 | p++; |
| 157 | while (1) |
| 158 | { |
| 159 | if (p[0] == escape_char && escape_char != '"') |
| 160 | { |
| 161 | escape_char_run++; |
| 162 | p++; |
| 163 | continue; |
| 164 | } |
| 165 | else if (p[0] == '"') |
| 166 | { |
| 167 | while (escape_char_run > 1) |
| 168 | { |
| 169 | *o++ = escape_char; |
| 170 | escape_char_run -= 2; |
| 171 | } |
| 172 | |
| 173 | if (escape_char_run > 0) |
| 174 | { |
| 175 | /* escaped quote */ |
| 176 | *o++ = *p++; |
| 177 | escape_char_run = 0; |
| 178 | } |
| 179 | else if (p[1] == escape_char && escape_char == '"') |
| 180 | { |
| 181 | /* quote escaped by doubling */ |
| 182 | *o++ = *p; |
| 183 | p += 2; |
| 184 | } |
| 185 | else |
| 186 | { |
| 187 | /* The ending quote. */ |
| 188 | *o = '\0'; |
| 189 | /* Leave input pointer after token. */ |
| 190 | p++; |
| 191 | break; |
| 192 | } |
| 193 | } |
| 194 | else if (p[0] == '\0') |
| 195 | { |
| 196 | /* End of string, but no ending quote found. We might want to |
| 197 | flag this as an error, but for now will consider the end as |
| 198 | the end of the token. */ |
| 199 | *o = '\0'; |
| 200 | break; |
| 201 | } |
| 202 | else |
| 203 | { |
| 204 | *o++ = *p++; |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | else |
| 209 | { |
| 210 | /* Next token is delimited by whitespace. */ |
| 211 | const char * p1 = skip_nonspace (p); |
| 212 | memcpy (o, p, p1 - p); |
| 213 | o += (p1 - p); |
| 214 | *o = '\0'; |
| 215 | p = p1; |
| 216 | } |
| 217 | |
| 218 | *pSrc = p; |
| 219 | |
| 220 | return o - buf; |
| 221 | } |
| 222 | |
| 223 | /* Search for EXEC file in DIR. If EXEC does not have an extension, |
| 224 | DIR is searched for EXEC with the standard extensions appended. */ |
| 225 | int |
| 226 | search_dir (const char *dir, const char *exec, int bufsize, char *buffer) |
| 227 | { |
| 228 | const char *exts[] = {".bat", ".cmd", ".exe", ".com"}; |
| 229 | int n_exts = sizeof (exts) / sizeof (char *); |
| 230 | char *dummy; |
| 231 | int i, rc; |
| 232 | |
| 233 | /* Search the directory for the program. */ |
| 234 | for (i = 0; i < n_exts; i++) |
| 235 | { |
| 236 | rc = SearchPath (dir, exec, exts[i], bufsize, buffer, &dummy); |
| 237 | if (rc > 0) |
| 238 | return rc; |
| 239 | } |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | /* Return the absolute name of executable file PROG, including |
| 245 | any file extensions. If an absolute name for PROG cannot be found, |
| 246 | return NULL. */ |
| 247 | char * |
| 248 | make_absolute (const char *prog) |
| 249 | { |
| 250 | char absname[MAX_PATH]; |
| 251 | char dir[MAX_PATH]; |
| 252 | char curdir[MAX_PATH]; |
| 253 | char *p, *path; |
| 254 | const char *fname; |
| 255 | |
| 256 | /* At least partial absolute path specified; search there. */ |
| 257 | if ((isalpha (prog[0]) && prog[1] == ':') || |
| 258 | (prog[0] == '\\')) |
| 259 | { |
| 260 | /* Split the directory from the filename. */ |
| 261 | fname = strrchr (prog, '\\'); |
| 262 | if (!fname) |
| 263 | /* Only a drive specifier is given. */ |
| 264 | fname = prog + 2; |
| 265 | strncpy (dir, prog, fname - prog); |
| 266 | dir[fname - prog] = '\0'; |
| 267 | |
| 268 | /* Search the directory for the program. */ |
| 269 | if (search_dir (dir, prog, MAX_PATH, absname) > 0) |
| 270 | return strdup (absname); |
| 271 | else |
| 272 | return NULL; |
| 273 | } |
| 274 | |
| 275 | if (GetCurrentDirectory (MAX_PATH, curdir) <= 0) |
| 276 | return NULL; |
| 277 | |
| 278 | /* Relative path; search in current dir. */ |
| 279 | if (strpbrk (prog, "\\")) |
| 280 | { |
| 281 | if (search_dir (curdir, prog, MAX_PATH, absname) > 0) |
| 282 | return strdup (absname); |
| 283 | else |
| 284 | return NULL; |
| 285 | } |
| 286 | |
| 287 | /* Just filename; search current directory then PATH. */ |
| 288 | path = alloca (strlen (getenv ("PATH")) + strlen (curdir) + 2); |
| 289 | strcpy (path, curdir); |
| 290 | strcat (path, ";"); |
| 291 | strcat (path, getenv ("PATH")); |
| 292 | |
| 293 | while (*path) |
| 294 | { |
| 295 | size_t len; |
| 296 | |
| 297 | /* Get next directory from path. */ |
| 298 | p = path; |
| 299 | while (*p && *p != ';') p++; |
| 300 | /* A broken PATH could have too long directory names in it. */ |
| 301 | len = min (p - path, sizeof (dir) - 1); |
| 302 | strncpy (dir, path, len); |
| 303 | dir[len] = '\0'; |
| 304 | |
| 305 | /* Search the directory for the program. */ |
| 306 | if (search_dir (dir, prog, MAX_PATH, absname) > 0) |
| 307 | return strdup (absname); |
| 308 | |
| 309 | /* Move to the next directory. */ |
| 310 | path = p + 1; |
| 311 | } |
| 312 | |
| 313 | return NULL; |
| 314 | } |
| 315 | |
| 316 | /* Try to decode the given command line the way cmd would do it. On |
| 317 | success, return 1 with cmdline dequoted. Otherwise, when we've |
| 318 | found constructs only cmd can properly interpret, return 0 and |
| 319 | leave cmdline unchanged. */ |
| 320 | int |
| 321 | try_dequote_cmdline (char* cmdline) |
| 322 | { |
| 323 | /* Dequoting can only subtract characters, so the length of the |
| 324 | original command line is a bound on the amount of scratch space |
| 325 | we need. This length, in turn, is bounded by the 32k |
| 326 | CreateProcess limit. */ |
| 327 | char * old_pos = cmdline; |
| 328 | char * new_cmdline = alloca (strlen(cmdline)); |
| 329 | char * new_pos = new_cmdline; |
| 330 | char c; |
| 331 | |
| 332 | enum { |
| 333 | NORMAL, |
| 334 | AFTER_CARET, |
| 335 | INSIDE_QUOTE |
| 336 | } state = NORMAL; |
| 337 | |
| 338 | while ((c = *old_pos++)) |
| 339 | { |
| 340 | switch (state) |
| 341 | { |
| 342 | case NORMAL: |
| 343 | switch(c) |
| 344 | { |
| 345 | case '"': |
| 346 | *new_pos++ = c; |
| 347 | state = INSIDE_QUOTE; |
| 348 | break; |
| 349 | case '^': |
| 350 | state = AFTER_CARET; |
| 351 | break; |
| 352 | case '<': case '>': |
| 353 | case '&': case '|': |
| 354 | case '(': case ')': |
| 355 | case '%': case '!': |
| 356 | /* We saw an unquoted shell metacharacter and we don't |
| 357 | understand it. Bail out. */ |
| 358 | return 0; |
| 359 | default: |
| 360 | *new_pos++ = c; |
| 361 | break; |
| 362 | } |
| 363 | break; |
| 364 | case AFTER_CARET: |
| 365 | *new_pos++ = c; |
| 366 | state = NORMAL; |
| 367 | break; |
| 368 | case INSIDE_QUOTE: |
| 369 | switch (c) |
| 370 | { |
| 371 | case '"': |
| 372 | *new_pos++ = c; |
| 373 | state = NORMAL; |
| 374 | break; |
| 375 | case '%': |
| 376 | case '!': |
| 377 | /* Variable substitution inside quote. Bail out. */ |
| 378 | return 0; |
| 379 | default: |
| 380 | *new_pos++ = c; |
| 381 | break; |
| 382 | } |
| 383 | break; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | /* We were able to dequote the entire string. Copy our scratch |
| 388 | buffer on top of the original buffer and return success. */ |
| 389 | memcpy (cmdline, new_cmdline, new_pos - new_cmdline); |
| 390 | cmdline[new_pos - new_cmdline] = '\0'; |
| 391 | return 1; |
| 392 | } |
| 393 | |
| 394 | /*****************************************************************/ |
| 395 | |
| 396 | #if 0 |
| 397 | char ** _argv; |
| 398 | int _argc; |
| 399 | |
| 400 | /* Parse commandline into argv array, allowing proper quoting of args. */ |
| 401 | void |
| 402 | setup_argv (void) |
| 403 | { |
| 404 | char * cmdline = GetCommandLine (); |
| 405 | int arg_bytes = 0; |
| 406 | |
| 407 | |
| 408 | } |
| 409 | #endif |
| 410 | |
| 411 | /* Information about child proc is global, to allow for automatic |
| 412 | termination when interrupted. At the moment, only one child process |
| 413 | can be running at any one time. */ |
| 414 | |
| 415 | PROCESS_INFORMATION child; |
| 416 | int interactive = TRUE; |
| 417 | |
| 418 | BOOL |
| 419 | console_event_handler (DWORD event) |
| 420 | { |
| 421 | switch (event) |
| 422 | { |
| 423 | case CTRL_C_EVENT: |
| 424 | case CTRL_BREAK_EVENT: |
| 425 | if (!interactive) |
| 426 | { |
| 427 | /* Both command.com and cmd.exe have the annoying behavior of |
| 428 | prompting "Terminate batch job (y/n)?" when interrupted |
| 429 | while running a batch file, even if running in |
| 430 | non-interactive (-c) mode. Try to make up for this |
| 431 | deficiency by forcibly terminating the subprocess if |
| 432 | running non-interactively. */ |
| 433 | if (child.hProcess && |
| 434 | WaitForSingleObject (child.hProcess, 500) != WAIT_OBJECT_0) |
| 435 | TerminateProcess (child.hProcess, 0); |
| 436 | exit (STATUS_CONTROL_C_EXIT); |
| 437 | } |
| 438 | break; |
| 439 | |
| 440 | #if 0 |
| 441 | default: |
| 442 | /* CLOSE, LOGOFF and SHUTDOWN events - actually we don't get these |
| 443 | under Windows 95. */ |
| 444 | fail ("cmdproxy: received %d event\n", event); |
| 445 | if (child.hProcess) |
| 446 | TerminateProcess (child.hProcess, 0); |
| 447 | #endif |
| 448 | } |
| 449 | return TRUE; |
| 450 | } |
| 451 | |
| 452 | /* Change from normal usage; return value indicates whether spawn |
| 453 | succeeded or failed - program return code is returned separately. */ |
| 454 | int |
| 455 | spawn (const char *progname, char *cmdline, const char *dir, int *retcode) |
| 456 | { |
| 457 | BOOL success = FALSE; |
| 458 | SECURITY_ATTRIBUTES sec_attrs; |
| 459 | STARTUPINFO start; |
| 460 | /* In theory, passing NULL for the environment block to CreateProcess |
| 461 | is the same as passing the value of GetEnvironmentStrings, but |
| 462 | doing this explicitly seems to cure problems running DOS programs |
| 463 | in some cases. */ |
| 464 | char * envblock = GetEnvironmentStrings (); |
| 465 | |
| 466 | sec_attrs.nLength = sizeof (sec_attrs); |
| 467 | sec_attrs.lpSecurityDescriptor = NULL; |
| 468 | sec_attrs.bInheritHandle = FALSE; |
| 469 | |
| 470 | memset (&start, 0, sizeof (start)); |
| 471 | start.cb = sizeof (start); |
| 472 | |
| 473 | if (CreateProcess (progname, cmdline, &sec_attrs, NULL, TRUE, |
| 474 | 0, envblock, dir, &start, &child)) |
| 475 | { |
| 476 | success = TRUE; |
| 477 | /* wait for completion and pass on return code */ |
| 478 | WaitForSingleObject (child.hProcess, INFINITE); |
| 479 | if (retcode) |
| 480 | GetExitCodeProcess (child.hProcess, (DWORD *)retcode); |
| 481 | CloseHandle (child.hThread); |
| 482 | CloseHandle (child.hProcess); |
| 483 | child.hProcess = NULL; |
| 484 | } |
| 485 | |
| 486 | FreeEnvironmentStrings (envblock); |
| 487 | |
| 488 | return success; |
| 489 | } |
| 490 | |
| 491 | /* Return size of current environment block. */ |
| 492 | int |
| 493 | get_env_size (void) |
| 494 | { |
| 495 | char * start = GetEnvironmentStrings (); |
| 496 | char * tmp = start; |
| 497 | |
| 498 | while (tmp[0] || tmp[1]) |
| 499 | ++tmp; |
| 500 | FreeEnvironmentStrings (start); |
| 501 | return tmp + 2 - start; |
| 502 | } |
| 503 | |
| 504 | /******* Main program ********************************************/ |
| 505 | |
| 506 | int |
| 507 | main (int argc, char ** argv) |
| 508 | { |
| 509 | int rc; |
| 510 | int need_shell; |
| 511 | char * cmdline; |
| 512 | char * progname; |
| 513 | int envsize; |
| 514 | char **pass_through_args; |
| 515 | int num_pass_through_args; |
| 516 | char modname[MAX_PATH]; |
| 517 | char path[MAX_PATH]; |
| 518 | char dir[MAX_PATH]; |
| 519 | int status; |
| 520 | |
| 521 | interactive = TRUE; |
| 522 | |
| 523 | SetConsoleCtrlHandler ((PHANDLER_ROUTINE) console_event_handler, TRUE); |
| 524 | |
| 525 | if (!GetCurrentDirectory (sizeof (dir), dir)) |
| 526 | fail ("error: GetCurrentDirectory failed\n"); |
| 527 | |
| 528 | /* We serve double duty: we can be called either as a proxy for the |
| 529 | real shell (that is, because we are defined to be the user shell), |
| 530 | or in our role as a helper application for running DOS programs. |
| 531 | In the former case, we interpret the command line options as if we |
| 532 | were a Unix shell, but in the latter case we simply pass our |
| 533 | command line to CreateProcess. We know which case we are dealing |
| 534 | with by whether argv[0] refers to ourself or to some other program. |
| 535 | (This relies on an arcane feature of CreateProcess, where we can |
| 536 | specify cmdproxy as the module to run, but specify a different |
| 537 | program in the command line - the MSVC startup code sets argv[0] |
| 538 | from the command line.) */ |
| 539 | |
| 540 | if (!GetModuleFileName (NULL, modname, sizeof (modname))) |
| 541 | fail ("error: GetModuleFileName failed\n"); |
| 542 | |
| 543 | /* Change directory to location of .exe so startup directory can be |
| 544 | deleted. */ |
| 545 | progname = strrchr (modname, '\\'); |
| 546 | *progname = '\0'; |
| 547 | SetCurrentDirectory (modname); |
| 548 | *progname = '\\'; |
| 549 | |
| 550 | /* Due to problems with interaction between API functions that use "OEM" |
| 551 | codepage vs API functions that use the "ANSI" codepage, we need to |
| 552 | make things consistent by choosing one and sticking with it. */ |
| 553 | SetConsoleCP (GetACP ()); |
| 554 | SetConsoleOutputCP (GetACP ()); |
| 555 | |
| 556 | /* Although Emacs always sets argv[0] to an absolute pathname, we |
| 557 | might get run in other ways as well, so convert argv[0] to an |
| 558 | absolute name before comparing to the module name. */ |
| 559 | path[0] = '\0'; |
| 560 | /* The call to SearchPath will find argv[0] in the current |
| 561 | directory, append ".exe" to it if needed, and also canonicalize |
| 562 | it, to resolve references to ".", "..", etc. */ |
| 563 | status = SearchPath (NULL, argv[0], ".exe", sizeof (path), path, |
| 564 | &progname); |
| 565 | if (!(status > 0 && stricmp (modname, path) == 0)) |
| 566 | { |
| 567 | if (status <= 0) |
| 568 | { |
| 569 | char *s; |
| 570 | |
| 571 | /* Make sure we have argv[0] in path[], as the failed |
| 572 | SearchPath might not have copied it there. */ |
| 573 | strcpy (path, argv[0]); |
| 574 | /* argv[0] could include forward slashes; convert them all |
| 575 | to backslashes, for strrchr calls below to DTRT. */ |
| 576 | for (s = path; *s; s++) |
| 577 | if (*s == '/') |
| 578 | *s = '\\'; |
| 579 | } |
| 580 | /* Perhaps MODNAME and PATH use mixed short and long file names. */ |
| 581 | if (!(GetShortPathName (modname, modname, sizeof (modname)) |
| 582 | && GetShortPathName (path, path, sizeof (path)) |
| 583 | && stricmp (modname, path) == 0)) |
| 584 | { |
| 585 | /* Sometimes GetShortPathName fails because one or more |
| 586 | directories leading to argv[0] have issues with access |
| 587 | rights. In that case, at least we can compare the |
| 588 | basenames. Note: this disregards the improbable case of |
| 589 | invoking a program of the same name from another |
| 590 | directory, since the chances of that other executable to |
| 591 | be both our namesake and a 16-bit DOS application are nil. */ |
| 592 | char *p = strrchr (path, '\\'); |
| 593 | char *q = strrchr (modname, '\\'); |
| 594 | char *pdot, *qdot; |
| 595 | |
| 596 | if (!p) |
| 597 | p = strchr (path, ':'); |
| 598 | if (!p) |
| 599 | p = path; |
| 600 | else |
| 601 | p++; |
| 602 | if (!q) |
| 603 | q = strchr (modname, ':'); |
| 604 | if (!q) |
| 605 | q = modname; |
| 606 | else |
| 607 | q++; |
| 608 | |
| 609 | pdot = strrchr (p, '.'); |
| 610 | if (!pdot || stricmp (pdot, ".exe") != 0) |
| 611 | pdot = p + strlen (p); |
| 612 | qdot = strrchr (q, '.'); |
| 613 | if (!qdot || stricmp (qdot, ".exe") != 0) |
| 614 | qdot = q + strlen (q); |
| 615 | if (pdot - p != qdot - q || strnicmp (p, q, pdot - p) != 0) |
| 616 | { |
| 617 | /* We are being used as a helper to run a DOS app; just |
| 618 | pass command line to DOS app without change. */ |
| 619 | /* TODO: fill in progname. */ |
| 620 | if (spawn (NULL, GetCommandLine (), dir, &rc)) |
| 621 | return rc; |
| 622 | fail ("Could not run %s\n", GetCommandLine ()); |
| 623 | } |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | /* Process command line. If running interactively (-c or /c not |
| 628 | specified) then spawn a real command shell, passing it the command |
| 629 | line arguments. |
| 630 | |
| 631 | If not running interactively, then attempt to execute the specified |
| 632 | command directly. If necessary, spawn a real shell to execute the |
| 633 | command. |
| 634 | |
| 635 | */ |
| 636 | |
| 637 | progname = NULL; |
| 638 | cmdline = NULL; |
| 639 | /* If no args, spawn real shell for interactive use. */ |
| 640 | need_shell = TRUE; |
| 641 | interactive = TRUE; |
| 642 | /* Ask command.com to create an environment block with a reasonable |
| 643 | amount of free space. */ |
| 644 | envsize = get_env_size () + 300; |
| 645 | pass_through_args = (char **) alloca (argc * sizeof (char *)); |
| 646 | num_pass_through_args = 0; |
| 647 | |
| 648 | while (--argc > 0) |
| 649 | { |
| 650 | ++argv; |
| 651 | /* Act on switches we recognize (mostly single letter switches, |
| 652 | except for -e); all unrecognized switches and extra args are |
| 653 | passed on to real shell if used (only really of benefit for |
| 654 | interactive use, but allow for batch use as well). Accept / as |
| 655 | switch char for compatibility with cmd.exe. */ |
| 656 | if (((*argv)[0] == '-' || (*argv)[0] == '/') && (*argv)[1] != '\0') |
| 657 | { |
| 658 | if (((*argv)[1] == 'c' || (*argv)[1] == 'C') && ((*argv)[2] == '\0')) |
| 659 | { |
| 660 | if (--argc == 0) |
| 661 | fail ("error: expecting arg for %s\n", *argv); |
| 662 | cmdline = *(++argv); |
| 663 | interactive = FALSE; |
| 664 | } |
| 665 | else if (((*argv)[1] == 'i' || (*argv)[1] == 'I') && ((*argv)[2] == '\0')) |
| 666 | { |
| 667 | if (cmdline) |
| 668 | warn ("warning: %s ignored because of -c\n", *argv); |
| 669 | } |
| 670 | else if (((*argv)[1] == 'e' || (*argv)[1] == 'E') && ((*argv)[2] == ':')) |
| 671 | { |
| 672 | int requested_envsize = atoi (*argv + 3); |
| 673 | /* Enforce a reasonable minimum size, as above. */ |
| 674 | if (requested_envsize > envsize) |
| 675 | envsize = requested_envsize; |
| 676 | /* For sanity, enforce a reasonable maximum. */ |
| 677 | if (envsize > 32768) |
| 678 | envsize = 32768; |
| 679 | } |
| 680 | else |
| 681 | { |
| 682 | /* warn ("warning: unknown option %s ignored", *argv); */ |
| 683 | pass_through_args[num_pass_through_args++] = *argv; |
| 684 | } |
| 685 | } |
| 686 | else |
| 687 | break; |
| 688 | } |
| 689 | |
| 690 | #if 0 |
| 691 | /* I think this is probably not useful - cmd.exe ignores extra |
| 692 | (non-switch) args in interactive mode, and they cannot be passed on |
| 693 | when -c was given. */ |
| 694 | |
| 695 | /* Collect any remaining args after (initial) switches. */ |
| 696 | while (argc-- > 0) |
| 697 | { |
| 698 | pass_through_args[num_pass_through_args++] = *argv++; |
| 699 | } |
| 700 | #else |
| 701 | /* Probably a mistake for there to be extra args; not fatal. */ |
| 702 | if (argc > 0) |
| 703 | warn ("warning: extra args ignored after '%s'\n", argv[-1]); |
| 704 | #endif |
| 705 | |
| 706 | pass_through_args[num_pass_through_args] = NULL; |
| 707 | |
| 708 | /* If -c option, determine if we must spawn a real shell, or if we can |
| 709 | execute the command directly ourself. */ |
| 710 | if (cmdline) |
| 711 | { |
| 712 | const char *args; |
| 713 | |
| 714 | /* The program name is the first token of cmdline. Since |
| 715 | filenames cannot legally contain embedded quotes, the value |
| 716 | of escape_char doesn't matter. */ |
| 717 | args = cmdline; |
| 718 | if (!get_next_token (path, &args)) |
| 719 | fail ("error: no program name specified.\n"); |
| 720 | |
| 721 | canon_filename (path); |
| 722 | progname = make_absolute (path); |
| 723 | |
| 724 | /* If we found the program and the rest of the command line does |
| 725 | not contain unquoted shell metacharacters, run the program |
| 726 | directly (if not found it might be an internal shell command, |
| 727 | so don't fail). */ |
| 728 | if (progname != NULL && try_dequote_cmdline (cmdline)) |
| 729 | need_shell = FALSE; |
| 730 | else |
| 731 | progname = NULL; |
| 732 | } |
| 733 | |
| 734 | pass_to_shell: |
| 735 | if (need_shell) |
| 736 | { |
| 737 | char * p; |
| 738 | int extra_arg_space = 0; |
| 739 | int maxlen, remlen; |
| 740 | int run_command_dot_com; |
| 741 | |
| 742 | progname = getenv ("COMSPEC"); |
| 743 | if (!progname) |
| 744 | fail ("error: COMSPEC is not set\n"); |
| 745 | |
| 746 | canon_filename (progname); |
| 747 | progname = make_absolute (progname); |
| 748 | |
| 749 | if (progname == NULL || strchr (progname, '\\') == NULL) |
| 750 | fail ("error: the program %s could not be found.\n", getenv ("COMSPEC")); |
| 751 | |
| 752 | /* Need to set environment size when running command.com. */ |
| 753 | run_command_dot_com = |
| 754 | (stricmp (strrchr (progname, '\\'), "command.com") == 0); |
| 755 | |
| 756 | /* Work out how much extra space is required for |
| 757 | pass_through_args. */ |
| 758 | for (argv = pass_through_args; *argv != NULL; ++argv) |
| 759 | /* We don't expect to have to quote switches. */ |
| 760 | extra_arg_space += strlen (*argv) + 2; |
| 761 | |
| 762 | if (cmdline) |
| 763 | { |
| 764 | char * buf; |
| 765 | |
| 766 | /* Convert to syntax expected by cmd.exe/command.com for |
| 767 | running non-interactively. Always quote program name in |
| 768 | case path contains spaces (fortunately it can't contain |
| 769 | quotes, since they are illegal in path names). */ |
| 770 | |
| 771 | remlen = maxlen = |
| 772 | strlen (progname) + extra_arg_space + strlen (cmdline) + 16; |
| 773 | buf = p = alloca (maxlen + 1); |
| 774 | |
| 775 | /* Quote progname in case it contains spaces. */ |
| 776 | p += _snprintf (p, remlen, "\"%s\"", progname); |
| 777 | remlen = maxlen - (p - buf); |
| 778 | |
| 779 | /* Include pass_through_args verbatim; these are just switches |
| 780 | so should not need quoting. */ |
| 781 | for (argv = pass_through_args; *argv != NULL; ++argv) |
| 782 | { |
| 783 | p += _snprintf (p, remlen, " %s", *argv); |
| 784 | remlen = maxlen - (p - buf); |
| 785 | } |
| 786 | |
| 787 | if (run_command_dot_com) |
| 788 | _snprintf (p, remlen, " /e:%d /c %s", envsize, cmdline); |
| 789 | else |
| 790 | _snprintf (p, remlen, " /c %s", cmdline); |
| 791 | cmdline = buf; |
| 792 | } |
| 793 | else |
| 794 | { |
| 795 | if (run_command_dot_com) |
| 796 | { |
| 797 | /* Provide dir arg expected by command.com when first |
| 798 | started interactively (the "command search path"). To |
| 799 | avoid potential problems with spaces in command dir |
| 800 | (which cannot be quoted - command.com doesn't like it), |
| 801 | we always use the 8.3 form. */ |
| 802 | GetShortPathName (progname, path, sizeof (path)); |
| 803 | p = strrchr (path, '\\'); |
| 804 | /* Trailing slash is acceptable, so always leave it. */ |
| 805 | *(++p) = '\0'; |
| 806 | } |
| 807 | else |
| 808 | path[0] = '\0'; |
| 809 | |
| 810 | remlen = maxlen = |
| 811 | strlen (progname) + extra_arg_space + strlen (path) + 13; |
| 812 | cmdline = p = alloca (maxlen + 1); |
| 813 | |
| 814 | /* Quote progname in case it contains spaces. */ |
| 815 | p += _snprintf (p, remlen, "\"%s\" %s", progname, path); |
| 816 | remlen = maxlen - (p - cmdline); |
| 817 | |
| 818 | /* Include pass_through_args verbatim; these are just switches |
| 819 | so should not need quoting. */ |
| 820 | for (argv = pass_through_args; *argv != NULL; ++argv) |
| 821 | { |
| 822 | p += _snprintf (p, remlen, " %s", *argv); |
| 823 | remlen = maxlen - (p - cmdline); |
| 824 | } |
| 825 | |
| 826 | if (run_command_dot_com) |
| 827 | _snprintf (p, remlen, " /e:%d", envsize); |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | if (!progname) |
| 832 | fail ("Internal error: program name not defined\n"); |
| 833 | |
| 834 | if (!cmdline) |
| 835 | cmdline = progname; |
| 836 | |
| 837 | if (spawn (progname, cmdline, dir, &rc)) |
| 838 | return rc; |
| 839 | |
| 840 | if (!need_shell) |
| 841 | { |
| 842 | need_shell = TRUE; |
| 843 | goto pass_to_shell; |
| 844 | } |
| 845 | |
| 846 | fail ("Could not run %s\n", progname); |
| 847 | |
| 848 | return 0; |
| 849 | } |