Commit | Line | Data |
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8c012929 | 1 | /* Proxy shell designed for use with Emacs on Windows 95 and NT. |
eef0be9e | 2 | Copyright (C) 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
5df4f04c | 3 | 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
8c012929 | 4 | |
aecf7181 | 5 | Accepts subset of Unix sh(1) command-line options, for compatibility |
8c012929 GV |
6 | with elisp code written for Unix. When possible, executes external |
7 | programs directly (a common use of /bin/sh by Emacs), otherwise | |
8 | invokes the user-specified command processor to handle built-in shell | |
9 | commands, batch files and interactive mode. | |
10 | ||
11 | The main function is simply to process the "-c string" option in the | |
12 | way /bin/sh does, since the standard Windows command shells use the | |
13 | convention that everything after "/c" (the Windows equivalent of | |
14 | "-c") is the input string. | |
15 | ||
16 | This file is part of GNU Emacs. | |
17 | ||
eef0be9e | 18 | GNU Emacs is free software: you can redistribute it and/or modify |
8c012929 | 19 | it under the terms of the GNU General Public License as published by |
eef0be9e GM |
20 | the Free Software Foundation, either version 3 of the License, or |
21 | (at your option) any later version. | |
8c012929 GV |
22 | |
23 | GNU Emacs is distributed in the hope that it will be useful, | |
24 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | GNU General Public License for more details. | |
27 | ||
28 | You should have received a copy of the GNU General Public License | |
eef0be9e | 29 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
8c012929 GV |
30 | |
31 | #include <windows.h> | |
32 | ||
33 | #include <stdarg.h> /* va_args */ | |
34 | #include <malloc.h> /* alloca */ | |
35 | #include <stdlib.h> /* getenv */ | |
36 | #include <string.h> /* strlen */ | |
37 | ||
c5958e82 ÓF |
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, ...); | |
8c012929 GV |
41 | |
42 | /******* Mock C library routines *********************************/ | |
43 | ||
44 | /* These routines are used primarily to minimize the executable size. */ | |
45 | ||
8c012929 GV |
46 | #define stdout GetStdHandle (STD_OUTPUT_HANDLE) |
47 | #define stderr GetStdHandle (STD_ERROR_HANDLE) | |
48 | ||
49 | int | |
0597ab06 | 50 | vfprintf (HANDLE hnd, const char * msg, va_list args) |
8c012929 GV |
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 | |
0597ab06 | 60 | fprintf (HANDLE hnd, const char * msg, ...) |
8c012929 GV |
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 | |
0597ab06 | 73 | printf (const char * msg, ...) |
8c012929 GV |
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 | |
0597ab06 | 86 | fail (const char * msg, ...) |
8c012929 GV |
87 | { |
88 | va_list args; | |
89 | ||
90 | va_start (args, msg); | |
91 | vfprintf (stderr, msg, args); | |
92 | va_end (args); | |
93 | ||
52969220 | 94 | exit (-1); |
8c012929 GV |
95 | } |
96 | ||
97 | void | |
0597ab06 | 98 | warn (const char * msg, ...) |
8c012929 GV |
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 | ||
0597ab06 JB |
124 | const char * |
125 | skip_space (const char *str) | |
8c012929 GV |
126 | { |
127 | while (isspace (*str)) str++; | |
128 | return str; | |
129 | } | |
130 | ||
0597ab06 JB |
131 | const char * |
132 | skip_nonspace (const char *str) | |
8c012929 GV |
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 | |
0597ab06 | 142 | get_next_token (char * buf, const char ** pSrc) |
8c012929 | 143 | { |
0597ab06 | 144 | const char * p = *pSrc; |
8c012929 GV |
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++; | |
2afff93a | 162 | p++; |
8c012929 GV |
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. */ | |
0597ab06 | 211 | const char * p1 = skip_nonspace (p); |
8c012929 GV |
212 | memcpy (o, p, p1 - p); |
213 | o += (p1 - p); | |
baf7eeb5 | 214 | *o = '\0'; |
8c012929 GV |
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 | |
0597ab06 | 226 | search_dir (const char *dir, const char *exec, int bufsize, char *buffer) |
8c012929 | 227 | { |
0597ab06 | 228 | const char *exts[] = {".bat", ".cmd", ".exe", ".com"}; |
8c012929 GV |
229 | int n_exts = sizeof (exts) / sizeof (char *); |
230 | char *dummy; | |
231 | int i, rc; | |
232 | ||
233 | /* Search the directory for the program. */ | |
177c0ea7 | 234 | for (i = 0; i < n_exts; i++) |
8c012929 GV |
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 | ||
177c0ea7 | 244 | /* Return the absolute name of executable file PROG, including |
8c012929 GV |
245 | any file extensions. If an absolute name for PROG cannot be found, |
246 | return NULL. */ | |
247 | char * | |
0597ab06 | 248 | make_absolute (const char *prog) |
8c012929 GV |
249 | { |
250 | char absname[MAX_PATH]; | |
251 | char dir[MAX_PATH]; | |
252 | char curdir[MAX_PATH]; | |
0597ab06 JB |
253 | char *p, *path; |
254 | const char *fname; | |
8c012929 GV |
255 | int i; |
256 | ||
257 | /* At least partial absolute path specified; search there. */ | |
258 | if ((isalpha (prog[0]) && prog[1] == ':') || | |
259 | (prog[0] == '\\')) | |
260 | { | |
261 | /* Split the directory from the filename. */ | |
262 | fname = strrchr (prog, '\\'); | |
263 | if (!fname) | |
264 | /* Only a drive specifier is given. */ | |
265 | fname = prog + 2; | |
266 | strncpy (dir, prog, fname - prog); | |
267 | dir[fname - prog] = '\0'; | |
268 | ||
269 | /* Search the directory for the program. */ | |
270 | if (search_dir (dir, prog, MAX_PATH, absname) > 0) | |
271 | return strdup (absname); | |
272 | else | |
273 | return NULL; | |
274 | } | |
275 | ||
177c0ea7 | 276 | if (GetCurrentDirectory (MAX_PATH, curdir) <= 0) |
8c012929 GV |
277 | return NULL; |
278 | ||
279 | /* Relative path; search in current dir. */ | |
177c0ea7 | 280 | if (strpbrk (prog, "\\")) |
8c012929 GV |
281 | { |
282 | if (search_dir (curdir, prog, MAX_PATH, absname) > 0) | |
283 | return strdup (absname); | |
177c0ea7 | 284 | else |
8c012929 GV |
285 | return NULL; |
286 | } | |
177c0ea7 | 287 | |
8c012929 GV |
288 | /* Just filename; search current directory then PATH. */ |
289 | path = alloca (strlen (getenv ("PATH")) + strlen (curdir) + 2); | |
290 | strcpy (path, curdir); | |
291 | strcat (path, ";"); | |
292 | strcat (path, getenv ("PATH")); | |
293 | ||
294 | while (*path) | |
295 | { | |
296 | /* Get next directory from path. */ | |
297 | p = path; | |
298 | while (*p && *p != ';') p++; | |
299 | strncpy (dir, path, p - path); | |
300 | dir[p - path] = '\0'; | |
301 | ||
302 | /* Search the directory for the program. */ | |
303 | if (search_dir (dir, prog, MAX_PATH, absname) > 0) | |
304 | return strdup (absname); | |
305 | ||
306 | /* Move to the next directory. */ | |
307 | path = p + 1; | |
177c0ea7 | 308 | } |
8c012929 GV |
309 | |
310 | return NULL; | |
311 | } | |
312 | ||
313 | /*****************************************************************/ | |
314 | ||
315 | #if 0 | |
316 | char ** _argv; | |
317 | int _argc; | |
318 | ||
319 | /* Parse commandline into argv array, allowing proper quoting of args. */ | |
320 | void | |
321 | setup_argv (void) | |
322 | { | |
323 | char * cmdline = GetCommandLine (); | |
324 | int arg_bytes = 0; | |
325 | ||
177c0ea7 | 326 | |
8c012929 GV |
327 | } |
328 | #endif | |
329 | ||
330 | /* Information about child proc is global, to allow for automatic | |
331 | termination when interrupted. At the moment, only one child process | |
332 | can be running at any one time. */ | |
333 | ||
334 | PROCESS_INFORMATION child; | |
335 | int interactive = TRUE; | |
336 | ||
337 | BOOL | |
338 | console_event_handler (DWORD event) | |
339 | { | |
340 | switch (event) | |
341 | { | |
342 | case CTRL_C_EVENT: | |
343 | case CTRL_BREAK_EVENT: | |
344 | if (!interactive) | |
345 | { | |
fffa137c | 346 | /* Both command.com and cmd.exe have the annoying behavior of |
8c012929 GV |
347 | prompting "Terminate batch job (y/n)?" when interrupted |
348 | while running a batch file, even if running in | |
349 | non-interactive (-c) mode. Try to make up for this | |
350 | deficiency by forcibly terminating the subprocess if | |
351 | running non-interactively. */ | |
352 | if (child.hProcess && | |
353 | WaitForSingleObject (child.hProcess, 500) != WAIT_OBJECT_0) | |
354 | TerminateProcess (child.hProcess, 0); | |
355 | exit (STATUS_CONTROL_C_EXIT); | |
356 | } | |
357 | break; | |
358 | ||
359 | #if 0 | |
360 | default: | |
361 | /* CLOSE, LOGOFF and SHUTDOWN events - actually we don't get these | |
362 | under Windows 95. */ | |
363 | fail ("cmdproxy: received %d event\n", event); | |
364 | if (child.hProcess) | |
365 | TerminateProcess (child.hProcess, 0); | |
366 | #endif | |
367 | } | |
368 | return TRUE; | |
369 | } | |
370 | ||
52969220 GV |
371 | /* Change from normal usage; return value indicates whether spawn |
372 | succeeded or failed - program return code is returned separately. */ | |
8c012929 | 373 | int |
0597ab06 | 374 | spawn (const char *progname, char *cmdline, const char *dir, int *retcode) |
8c012929 | 375 | { |
52969220 | 376 | BOOL success = FALSE; |
8c012929 GV |
377 | SECURITY_ATTRIBUTES sec_attrs; |
378 | STARTUPINFO start; | |
52969220 GV |
379 | /* In theory, passing NULL for the environment block to CreateProcess |
380 | is the same as passing the value of GetEnvironmentStrings, but | |
381 | doing this explicitly seems to cure problems running DOS programs | |
382 | in some cases. */ | |
baf7eeb5 | 383 | char * envblock = GetEnvironmentStrings (); |
8c012929 GV |
384 | |
385 | sec_attrs.nLength = sizeof (sec_attrs); | |
386 | sec_attrs.lpSecurityDescriptor = NULL; | |
387 | sec_attrs.bInheritHandle = FALSE; | |
177c0ea7 | 388 | |
8c012929 GV |
389 | memset (&start, 0, sizeof (start)); |
390 | start.cb = sizeof (start); | |
391 | ||
392 | if (CreateProcess (progname, cmdline, &sec_attrs, NULL, TRUE, | |
d78e84f7 | 393 | 0, envblock, dir, &start, &child)) |
8c012929 | 394 | { |
52969220 | 395 | success = TRUE; |
8c012929 GV |
396 | /* wait for completion and pass on return code */ |
397 | WaitForSingleObject (child.hProcess, INFINITE); | |
52969220 GV |
398 | if (retcode) |
399 | GetExitCodeProcess (child.hProcess, (DWORD *)retcode); | |
8c012929 GV |
400 | CloseHandle (child.hThread); |
401 | CloseHandle (child.hProcess); | |
402 | child.hProcess = NULL; | |
403 | } | |
404 | ||
baf7eeb5 GV |
405 | FreeEnvironmentStrings (envblock); |
406 | ||
52969220 | 407 | return success; |
8c012929 GV |
408 | } |
409 | ||
baf7eeb5 GV |
410 | /* Return size of current environment block. */ |
411 | int | |
7c3320d8 | 412 | get_env_size (void) |
baf7eeb5 GV |
413 | { |
414 | char * start = GetEnvironmentStrings (); | |
415 | char * tmp = start; | |
416 | ||
417 | while (tmp[0] || tmp[1]) | |
418 | ++tmp; | |
419 | FreeEnvironmentStrings (start); | |
420 | return tmp + 2 - start; | |
421 | } | |
422 | ||
8c012929 GV |
423 | /******* Main program ********************************************/ |
424 | ||
425 | int | |
426 | main (int argc, char ** argv) | |
427 | { | |
428 | int rc; | |
429 | int need_shell; | |
430 | char * cmdline; | |
431 | char * progname; | |
432 | int envsize; | |
baf7eeb5 GV |
433 | char **pass_through_args; |
434 | int num_pass_through_args; | |
8c012929 GV |
435 | char modname[MAX_PATH]; |
436 | char path[MAX_PATH]; | |
d78e84f7 | 437 | char dir[MAX_PATH]; |
8c012929 GV |
438 | |
439 | ||
440 | interactive = TRUE; | |
441 | ||
442 | SetConsoleCtrlHandler ((PHANDLER_ROUTINE) console_event_handler, TRUE); | |
443 | ||
d78e84f7 AI |
444 | if (!GetCurrentDirectory (sizeof (dir), dir)) |
445 | fail ("error: GetCurrentDirectory failed\n"); | |
446 | ||
8c012929 GV |
447 | /* We serve double duty: we can be called either as a proxy for the |
448 | real shell (that is, because we are defined to be the user shell), | |
449 | or in our role as a helper application for running DOS programs. | |
450 | In the former case, we interpret the command line options as if we | |
451 | were a Unix shell, but in the latter case we simply pass our | |
452 | command line to CreateProcess. We know which case we are dealing | |
453 | with by whether argv[0] refers to ourself or to some other program. | |
454 | (This relies on an arcane feature of CreateProcess, where we can | |
455 | specify cmdproxy as the module to run, but specify a different | |
456 | program in the command line - the MSVC startup code sets argv[0] | |
457 | from the command line.) */ | |
458 | ||
459 | if (!GetModuleFileName (NULL, modname, sizeof (modname))) | |
baf7eeb5 | 460 | fail ("error: GetModuleFileName failed\n"); |
8c012929 | 461 | |
d78e84f7 AI |
462 | /* Change directory to location of .exe so startup directory can be |
463 | deleted. */ | |
464 | progname = strrchr (modname, '\\'); | |
465 | *progname = '\0'; | |
466 | SetCurrentDirectory (modname); | |
467 | *progname = '\\'; | |
468 | ||
7387d2a0 JR |
469 | /* Due to problems with interaction between API functions that use "OEM" |
470 | codepage vs API functions that use the "ANSI" codepage, we need to | |
471 | make things consistent by choosing one and sticking with it. */ | |
0597ab06 JB |
472 | SetConsoleCP (GetACP ()); |
473 | SetConsoleOutputCP (GetACP ()); | |
7387d2a0 | 474 | |
8c012929 GV |
475 | /* Although Emacs always sets argv[0] to an absolute pathname, we |
476 | might get run in other ways as well, so convert argv[0] to an | |
a5e8ac59 AI |
477 | absolute name before comparing to the module name. Don't get |
478 | caught out by mixed short and long names. */ | |
479 | GetShortPathName (modname, modname, sizeof (modname)); | |
480 | path[0] = '\0'; | |
8c012929 | 481 | if (!SearchPath (NULL, argv[0], ".exe", sizeof (path), path, &progname) |
a5e8ac59 | 482 | || !GetShortPathName (path, path, sizeof (path)) |
8c012929 GV |
483 | || stricmp (modname, path) != 0) |
484 | { | |
485 | /* We are being used as a helper to run a DOS app; just pass | |
486 | command line to DOS app without change. */ | |
487 | /* TODO: fill in progname. */ | |
d78e84f7 | 488 | if (spawn (NULL, GetCommandLine (), dir, &rc)) |
52969220 GV |
489 | return rc; |
490 | fail ("Could not run %s\n", GetCommandLine ()); | |
8c012929 GV |
491 | } |
492 | ||
493 | /* Process command line. If running interactively (-c or /c not | |
494 | specified) then spawn a real command shell, passing it the command | |
495 | line arguments. | |
496 | ||
497 | If not running interactively, then attempt to execute the specified | |
498 | command directly. If necessary, spawn a real shell to execute the | |
499 | command. | |
500 | ||
501 | */ | |
502 | ||
503 | progname = NULL; | |
504 | cmdline = NULL; | |
505 | /* If no args, spawn real shell for interactive use. */ | |
506 | need_shell = TRUE; | |
507 | interactive = TRUE; | |
baf7eeb5 GV |
508 | /* Ask command.com to create an environment block with a reasonable |
509 | amount of free space. */ | |
510 | envsize = get_env_size () + 300; | |
0597ab06 | 511 | pass_through_args = (char **) alloca (argc * sizeof (char *)); |
baf7eeb5 | 512 | num_pass_through_args = 0; |
8c012929 GV |
513 | |
514 | while (--argc > 0) | |
515 | { | |
516 | ++argv; | |
baf7eeb5 | 517 | /* Act on switches we recognize (mostly single letter switches, |
aecf7181 | 518 | except for -e); all unrecognized switches and extra args are |
baf7eeb5 GV |
519 | passed on to real shell if used (only really of benefit for |
520 | interactive use, but allow for batch use as well). Accept / as | |
aecf7181 | 521 | switch char for compatibility with cmd.exe. */ |
1d7d10d1 | 522 | if (((*argv)[0] == '-' || (*argv)[0] == '/') && (*argv)[1] != '\0') |
8c012929 | 523 | { |
1d7d10d1 | 524 | if (((*argv)[1] == 'c' || (*argv)[1] == 'C') && ((*argv)[2] == '\0')) |
8c012929 GV |
525 | { |
526 | if (--argc == 0) | |
baf7eeb5 | 527 | fail ("error: expecting arg for %s\n", *argv); |
8c012929 GV |
528 | cmdline = *(++argv); |
529 | interactive = FALSE; | |
530 | } | |
1d7d10d1 | 531 | else if (((*argv)[1] == 'i' || (*argv)[1] == 'I') && ((*argv)[2] == '\0')) |
8c012929 GV |
532 | { |
533 | if (cmdline) | |
baf7eeb5 | 534 | warn ("warning: %s ignored because of -c\n", *argv); |
8c012929 | 535 | } |
f49f08cc | 536 | else if (((*argv)[1] == 'e' || (*argv)[1] == 'E') && ((*argv)[2] == ':')) |
8c012929 | 537 | { |
baf7eeb5 GV |
538 | int requested_envsize = atoi (*argv + 3); |
539 | /* Enforce a reasonable minimum size, as above. */ | |
540 | if (requested_envsize > envsize) | |
541 | envsize = requested_envsize; | |
542 | /* For sanity, enforce a reasonable maximum. */ | |
543 | if (envsize > 32768) | |
544 | envsize = 32768; | |
8c012929 GV |
545 | } |
546 | else | |
547 | { | |
baf7eeb5 GV |
548 | /* warn ("warning: unknown option %s ignored", *argv); */ |
549 | pass_through_args[num_pass_through_args++] = *argv; | |
8c012929 GV |
550 | } |
551 | } | |
552 | else | |
553 | break; | |
554 | } | |
555 | ||
baf7eeb5 GV |
556 | #if 0 |
557 | /* I think this is probably not useful - cmd.exe ignores extra | |
558 | (non-switch) args in interactive mode, and they cannot be passed on | |
559 | when -c was given. */ | |
560 | ||
561 | /* Collect any remaining args after (initial) switches. */ | |
562 | while (argc-- > 0) | |
563 | { | |
564 | pass_through_args[num_pass_through_args++] = *argv++; | |
565 | } | |
566 | #else | |
567 | /* Probably a mistake for there to be extra args; not fatal. */ | |
568 | if (argc > 0) | |
ec025f9d | 569 | warn ("warning: extra args ignored after '%s'\n", argv[-1]); |
baf7eeb5 GV |
570 | #endif |
571 | ||
572 | pass_through_args[num_pass_through_args] = NULL; | |
573 | ||
8c012929 GV |
574 | /* If -c option, determine if we must spawn a real shell, or if we can |
575 | execute the command directly ourself. */ | |
576 | if (cmdline) | |
577 | { | |
578 | /* If no redirection or piping, and if program can be found, then | |
579 | run program directly. Otherwise invoke a real shell. */ | |
580 | ||
581 | static char copout_chars[] = "|<>&"; | |
582 | ||
583 | if (strpbrk (cmdline, copout_chars) == NULL) | |
584 | { | |
0597ab06 | 585 | const char *args; |
8c012929 GV |
586 | |
587 | /* The program name is the first token of cmdline. Since | |
588 | filenames cannot legally contain embedded quotes, the value | |
589 | of escape_char doesn't matter. */ | |
590 | args = cmdline; | |
591 | if (!get_next_token (path, &args)) | |
592 | fail ("error: no program name specified.\n"); | |
593 | ||
594 | canon_filename (path); | |
595 | progname = make_absolute (path); | |
596 | ||
597 | /* If we found the program, run it directly (if not found it | |
598 | might be an internal shell command, so don't fail). */ | |
599 | if (progname != NULL) | |
600 | need_shell = FALSE; | |
601 | } | |
602 | } | |
603 | ||
ec025f9d | 604 | pass_to_shell: |
8c012929 GV |
605 | if (need_shell) |
606 | { | |
607 | char * p; | |
baf7eeb5 | 608 | int extra_arg_space = 0; |
c5958e82 | 609 | int maxlen, remlen; |
8de1edce | 610 | int run_command_dot_com; |
8c012929 GV |
611 | |
612 | progname = getenv ("COMSPEC"); | |
613 | if (!progname) | |
baf7eeb5 | 614 | fail ("error: COMSPEC is not set\n"); |
8c012929 GV |
615 | |
616 | canon_filename (progname); | |
617 | progname = make_absolute (progname); | |
618 | ||
619 | if (progname == NULL || strchr (progname, '\\') == NULL) | |
baf7eeb5 GV |
620 | fail ("error: the program %s could not be found.\n", getenv ("COMSPEC")); |
621 | ||
8de1edce GV |
622 | /* Need to set environment size when running command.com. */ |
623 | run_command_dot_com = | |
624 | (stricmp (strrchr (progname, '\\'), "command.com") == 0); | |
625 | ||
baf7eeb5 GV |
626 | /* Work out how much extra space is required for |
627 | pass_through_args. */ | |
628 | for (argv = pass_through_args; *argv != NULL; ++argv) | |
629 | /* We don't expect to have to quote switches. */ | |
630 | extra_arg_space += strlen (*argv) + 2; | |
8c012929 GV |
631 | |
632 | if (cmdline) | |
633 | { | |
baf7eeb5 GV |
634 | char * buf; |
635 | ||
8c012929 GV |
636 | /* Convert to syntax expected by cmd.exe/command.com for |
637 | running non-interactively. Always quote program name in | |
638 | case path contains spaces (fortunately it can't contain | |
639 | quotes, since they are illegal in path names). */ | |
baf7eeb5 | 640 | |
c5958e82 ÓF |
641 | remlen = maxlen = |
642 | strlen (progname) + extra_arg_space + strlen (cmdline) + 16; | |
643 | buf = p = alloca (maxlen + 1); | |
baf7eeb5 GV |
644 | |
645 | /* Quote progname in case it contains spaces. */ | |
c5958e82 ÓF |
646 | p += _snprintf (p, remlen, "\"%s\"", progname); |
647 | remlen = maxlen - (p - buf); | |
baf7eeb5 GV |
648 | |
649 | /* Include pass_through_args verbatim; these are just switches | |
650 | so should not need quoting. */ | |
651 | for (argv = pass_through_args; *argv != NULL; ++argv) | |
c5958e82 ÓF |
652 | { |
653 | p += _snprintf (p, remlen, " %s", *argv); | |
654 | remlen = maxlen - (p - buf); | |
655 | } | |
baf7eeb5 | 656 | |
8de1edce | 657 | if (run_command_dot_com) |
c5958e82 | 658 | _snprintf (p, remlen, " /e:%d /c %s", envsize, cmdline); |
ec025f9d | 659 | else |
c5958e82 | 660 | _snprintf (p, remlen, " /c %s", cmdline); |
baf7eeb5 | 661 | cmdline = buf; |
8c012929 GV |
662 | } |
663 | else | |
664 | { | |
8de1edce | 665 | if (run_command_dot_com) |
ec025f9d GV |
666 | { |
667 | /* Provide dir arg expected by command.com when first | |
8de1edce | 668 | started interactively (the "command search path"). To |
ec025f9d GV |
669 | avoid potential problems with spaces in command dir |
670 | (which cannot be quoted - command.com doesn't like it), | |
671 | we always use the 8.3 form. */ | |
672 | GetShortPathName (progname, path, sizeof (path)); | |
673 | p = strrchr (path, '\\'); | |
674 | /* Trailing slash is acceptable, so always leave it. */ | |
675 | *(++p) = '\0'; | |
676 | } | |
677 | else | |
ec025f9d | 678 | path[0] = '\0'; |
8c012929 | 679 | |
c5958e82 ÓF |
680 | remlen = maxlen = |
681 | strlen (progname) + extra_arg_space + strlen (path) + 13; | |
682 | cmdline = p = alloca (maxlen + 1); | |
8c012929 GV |
683 | |
684 | /* Quote progname in case it contains spaces. */ | |
c5958e82 ÓF |
685 | p += _snprintf (p, remlen, "\"%s\" %s", progname, path); |
686 | remlen = maxlen - (p - cmdline); | |
baf7eeb5 GV |
687 | |
688 | /* Include pass_through_args verbatim; these are just switches | |
689 | so should not need quoting. */ | |
690 | for (argv = pass_through_args; *argv != NULL; ++argv) | |
c5958e82 ÓF |
691 | { |
692 | p += _snprintf (p, remlen, " %s", *argv); | |
693 | remlen = maxlen - (p - cmdline); | |
694 | } | |
baf7eeb5 | 695 | |
8de1edce | 696 | if (run_command_dot_com) |
0597ab06 | 697 | _snprintf (p, remlen, " /e:%d", envsize); |
8c012929 GV |
698 | } |
699 | } | |
700 | ||
701 | if (!progname) | |
702 | fail ("Internal error: program name not defined\n"); | |
703 | ||
704 | if (!cmdline) | |
705 | cmdline = progname; | |
706 | ||
d78e84f7 | 707 | if (spawn (progname, cmdline, dir, &rc)) |
52969220 | 708 | return rc; |
8c012929 | 709 | |
52969220 GV |
710 | if (!need_shell) |
711 | { | |
712 | need_shell = TRUE; | |
713 | goto pass_to_shell; | |
714 | } | |
715 | ||
716 | fail ("Could not run %s\n", progname); | |
717 | ||
718 | return 0; | |
8c012929 | 719 | } |
ab5796a9 | 720 |