Commit | Line | Data |
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8c012929 | 1 | /* Proxy shell designed for use with Emacs on Windows 95 and NT. |
ba318903 | 2 | Copyright (C) 1997, 2001-2014 Free Software Foundation, Inc. |
8c012929 | 3 | |
aecf7181 | 4 | Accepts subset of Unix sh(1) command-line options, for compatibility |
8c012929 GV |
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 | ||
eef0be9e | 17 | GNU Emacs is free software: you can redistribute it and/or modify |
8c012929 | 18 | it under the terms of the GNU General Public License as published by |
eef0be9e GM |
19 | the Free Software Foundation, either version 3 of the License, or |
20 | (at your option) any later version. | |
8c012929 GV |
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 | |
eef0be9e | 28 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
8c012929 GV |
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 */ | |
9c88f339 | 36 | #include <ctype.h> /* isspace, isalpha */ |
8c012929 | 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 | |
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 | ||
177c0ea7 | 275 | if (GetCurrentDirectory (MAX_PATH, curdir) <= 0) |
8c012929 GV |
276 | return NULL; |
277 | ||
278 | /* Relative path; search in current dir. */ | |
177c0ea7 | 279 | if (strpbrk (prog, "\\")) |
8c012929 GV |
280 | { |
281 | if (search_dir (curdir, prog, MAX_PATH, absname) > 0) | |
282 | return strdup (absname); | |
177c0ea7 | 283 | else |
8c012929 GV |
284 | return NULL; |
285 | } | |
177c0ea7 | 286 | |
8c012929 GV |
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 | { | |
7ece6d40 EZ |
295 | size_t len; |
296 | ||
8c012929 GV |
297 | /* Get next directory from path. */ |
298 | p = path; | |
299 | while (*p && *p != ';') p++; | |
7ece6d40 EZ |
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'; | |
8c012929 GV |
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; | |
177c0ea7 | 311 | } |
8c012929 GV |
312 | |
313 | return NULL; | |
314 | } | |
315 | ||
8f91bf93 DC |
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 | |
c91c771d | 326 | CreateProcess limit. */ |
8f91bf93 DC |
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: | |
fe9c230b DC |
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 | } | |
8f91bf93 DC |
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 | ||
8c012929 GV |
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 | ||
177c0ea7 | 407 | |
8c012929 GV |
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 | { | |
fffa137c | 427 | /* Both command.com and cmd.exe have the annoying behavior of |
8c012929 GV |
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 | ||
52969220 GV |
452 | /* Change from normal usage; return value indicates whether spawn |
453 | succeeded or failed - program return code is returned separately. */ | |
8c012929 | 454 | int |
0597ab06 | 455 | spawn (const char *progname, char *cmdline, const char *dir, int *retcode) |
8c012929 | 456 | { |
52969220 | 457 | BOOL success = FALSE; |
8c012929 GV |
458 | SECURITY_ATTRIBUTES sec_attrs; |
459 | STARTUPINFO start; | |
52969220 GV |
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. */ | |
baf7eeb5 | 464 | char * envblock = GetEnvironmentStrings (); |
8c012929 GV |
465 | |
466 | sec_attrs.nLength = sizeof (sec_attrs); | |
467 | sec_attrs.lpSecurityDescriptor = NULL; | |
468 | sec_attrs.bInheritHandle = FALSE; | |
177c0ea7 | 469 | |
8c012929 GV |
470 | memset (&start, 0, sizeof (start)); |
471 | start.cb = sizeof (start); | |
472 | ||
473 | if (CreateProcess (progname, cmdline, &sec_attrs, NULL, TRUE, | |
d78e84f7 | 474 | 0, envblock, dir, &start, &child)) |
8c012929 | 475 | { |
52969220 | 476 | success = TRUE; |
8c012929 GV |
477 | /* wait for completion and pass on return code */ |
478 | WaitForSingleObject (child.hProcess, INFINITE); | |
52969220 GV |
479 | if (retcode) |
480 | GetExitCodeProcess (child.hProcess, (DWORD *)retcode); | |
8c012929 GV |
481 | CloseHandle (child.hThread); |
482 | CloseHandle (child.hProcess); | |
483 | child.hProcess = NULL; | |
484 | } | |
485 | ||
baf7eeb5 GV |
486 | FreeEnvironmentStrings (envblock); |
487 | ||
52969220 | 488 | return success; |
8c012929 GV |
489 | } |
490 | ||
baf7eeb5 GV |
491 | /* Return size of current environment block. */ |
492 | int | |
7c3320d8 | 493 | get_env_size (void) |
baf7eeb5 GV |
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 | ||
8c012929 GV |
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; | |
baf7eeb5 GV |
514 | char **pass_through_args; |
515 | int num_pass_through_args; | |
8c012929 GV |
516 | char modname[MAX_PATH]; |
517 | char path[MAX_PATH]; | |
d78e84f7 | 518 | char dir[MAX_PATH]; |
58b65bf5 | 519 | int status; |
8c012929 GV |
520 | |
521 | interactive = TRUE; | |
522 | ||
523 | SetConsoleCtrlHandler ((PHANDLER_ROUTINE) console_event_handler, TRUE); | |
524 | ||
d78e84f7 AI |
525 | if (!GetCurrentDirectory (sizeof (dir), dir)) |
526 | fail ("error: GetCurrentDirectory failed\n"); | |
527 | ||
8c012929 GV |
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))) | |
baf7eeb5 | 541 | fail ("error: GetModuleFileName failed\n"); |
8c012929 | 542 | |
d78e84f7 AI |
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 | ||
7387d2a0 JR |
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. */ | |
0597ab06 JB |
553 | SetConsoleCP (GetACP ()); |
554 | SetConsoleOutputCP (GetACP ()); | |
7387d2a0 | 555 | |
8c012929 GV |
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 | |
58b65bf5 | 558 | absolute name before comparing to the module name. */ |
a5e8ac59 | 559 | path[0] = '\0'; |
58b65bf5 EZ |
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)) | |
8c012929 | 566 | { |
58b65bf5 EZ |
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 | } | |
8c012929 GV |
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; | |
baf7eeb5 GV |
642 | /* Ask command.com to create an environment block with a reasonable |
643 | amount of free space. */ | |
644 | envsize = get_env_size () + 300; | |
0597ab06 | 645 | pass_through_args = (char **) alloca (argc * sizeof (char *)); |
baf7eeb5 | 646 | num_pass_through_args = 0; |
8c012929 GV |
647 | |
648 | while (--argc > 0) | |
649 | { | |
650 | ++argv; | |
baf7eeb5 | 651 | /* Act on switches we recognize (mostly single letter switches, |
aecf7181 | 652 | except for -e); all unrecognized switches and extra args are |
baf7eeb5 GV |
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 | |
aecf7181 | 655 | switch char for compatibility with cmd.exe. */ |
1d7d10d1 | 656 | if (((*argv)[0] == '-' || (*argv)[0] == '/') && (*argv)[1] != '\0') |
8c012929 | 657 | { |
1d7d10d1 | 658 | if (((*argv)[1] == 'c' || (*argv)[1] == 'C') && ((*argv)[2] == '\0')) |
8c012929 GV |
659 | { |
660 | if (--argc == 0) | |
baf7eeb5 | 661 | fail ("error: expecting arg for %s\n", *argv); |
8c012929 GV |
662 | cmdline = *(++argv); |
663 | interactive = FALSE; | |
664 | } | |
1d7d10d1 | 665 | else if (((*argv)[1] == 'i' || (*argv)[1] == 'I') && ((*argv)[2] == '\0')) |
8c012929 GV |
666 | { |
667 | if (cmdline) | |
baf7eeb5 | 668 | warn ("warning: %s ignored because of -c\n", *argv); |
8c012929 | 669 | } |
f49f08cc | 670 | else if (((*argv)[1] == 'e' || (*argv)[1] == 'E') && ((*argv)[2] == ':')) |
8c012929 | 671 | { |
baf7eeb5 GV |
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; | |
8c012929 GV |
679 | } |
680 | else | |
681 | { | |
baf7eeb5 GV |
682 | /* warn ("warning: unknown option %s ignored", *argv); */ |
683 | pass_through_args[num_pass_through_args++] = *argv; | |
8c012929 GV |
684 | } |
685 | } | |
686 | else | |
687 | break; | |
688 | } | |
689 | ||
baf7eeb5 GV |
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) | |
ec025f9d | 703 | warn ("warning: extra args ignored after '%s'\n", argv[-1]); |
baf7eeb5 GV |
704 | #endif |
705 | ||
706 | pass_through_args[num_pass_through_args] = NULL; | |
707 | ||
8c012929 GV |
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 | { | |
8f91bf93 DC |
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; | |
8c012929 GV |
732 | } |
733 | ||
ec025f9d | 734 | pass_to_shell: |
8c012929 GV |
735 | if (need_shell) |
736 | { | |
737 | char * p; | |
baf7eeb5 | 738 | int extra_arg_space = 0; |
c5958e82 | 739 | int maxlen, remlen; |
8de1edce | 740 | int run_command_dot_com; |
8c012929 GV |
741 | |
742 | progname = getenv ("COMSPEC"); | |
743 | if (!progname) | |
baf7eeb5 | 744 | fail ("error: COMSPEC is not set\n"); |
8c012929 GV |
745 | |
746 | canon_filename (progname); | |
747 | progname = make_absolute (progname); | |
748 | ||
749 | if (progname == NULL || strchr (progname, '\\') == NULL) | |
baf7eeb5 GV |
750 | fail ("error: the program %s could not be found.\n", getenv ("COMSPEC")); |
751 | ||
8de1edce GV |
752 | /* Need to set environment size when running command.com. */ |
753 | run_command_dot_com = | |
754 | (stricmp (strrchr (progname, '\\'), "command.com") == 0); | |
755 | ||
baf7eeb5 GV |
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; | |
8c012929 GV |
761 | |
762 | if (cmdline) | |
763 | { | |
baf7eeb5 GV |
764 | char * buf; |
765 | ||
8c012929 GV |
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). */ | |
baf7eeb5 | 770 | |
c5958e82 ÓF |
771 | remlen = maxlen = |
772 | strlen (progname) + extra_arg_space + strlen (cmdline) + 16; | |
773 | buf = p = alloca (maxlen + 1); | |
baf7eeb5 GV |
774 | |
775 | /* Quote progname in case it contains spaces. */ | |
c5958e82 ÓF |
776 | p += _snprintf (p, remlen, "\"%s\"", progname); |
777 | remlen = maxlen - (p - buf); | |
baf7eeb5 GV |
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) | |
c5958e82 ÓF |
782 | { |
783 | p += _snprintf (p, remlen, " %s", *argv); | |
784 | remlen = maxlen - (p - buf); | |
785 | } | |
baf7eeb5 | 786 | |
8de1edce | 787 | if (run_command_dot_com) |
c5958e82 | 788 | _snprintf (p, remlen, " /e:%d /c %s", envsize, cmdline); |
ec025f9d | 789 | else |
c5958e82 | 790 | _snprintf (p, remlen, " /c %s", cmdline); |
baf7eeb5 | 791 | cmdline = buf; |
8c012929 GV |
792 | } |
793 | else | |
794 | { | |
8de1edce | 795 | if (run_command_dot_com) |
ec025f9d GV |
796 | { |
797 | /* Provide dir arg expected by command.com when first | |
8de1edce | 798 | started interactively (the "command search path"). To |
ec025f9d GV |
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 | |
ec025f9d | 808 | path[0] = '\0'; |
8c012929 | 809 | |
c5958e82 ÓF |
810 | remlen = maxlen = |
811 | strlen (progname) + extra_arg_space + strlen (path) + 13; | |
812 | cmdline = p = alloca (maxlen + 1); | |
8c012929 GV |
813 | |
814 | /* Quote progname in case it contains spaces. */ | |
c5958e82 ÓF |
815 | p += _snprintf (p, remlen, "\"%s\" %s", progname, path); |
816 | remlen = maxlen - (p - cmdline); | |
baf7eeb5 GV |
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) | |
c5958e82 ÓF |
821 | { |
822 | p += _snprintf (p, remlen, " %s", *argv); | |
823 | remlen = maxlen - (p - cmdline); | |
824 | } | |
baf7eeb5 | 825 | |
8de1edce | 826 | if (run_command_dot_com) |
0597ab06 | 827 | _snprintf (p, remlen, " /e:%d", envsize); |
8c012929 GV |
828 | } |
829 | } | |
830 | ||
831 | if (!progname) | |
832 | fail ("Internal error: program name not defined\n"); | |
833 | ||
834 | if (!cmdline) | |
835 | cmdline = progname; | |
836 | ||
d78e84f7 | 837 | if (spawn (progname, cmdline, dir, &rc)) |
52969220 | 838 | return rc; |
8c012929 | 839 | |
52969220 GV |
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; | |
8c012929 | 849 | } |