1 /* $OpenBSD: main.c,v 1.57 2015/09/10 22:48:58 nicm Exp $ */
2 /* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */
3 /* $OpenBSD: io.c,v 1.26 2015/09/11 08:00:27 guenther Exp $ */
4 /* $OpenBSD: table.c,v 1.16 2015/09/01 13:12:31 tedu Exp $ */
5
6 /*-
7 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
8 * 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018,
9 * 2019
10 * mirabilos <m@mirbsd.org>
11 *
12 * Provided that these terms and disclaimer and all copyright notices
13 * are retained or reproduced in an accompanying document, permission
14 * is granted to deal in this work without restriction, including un-
15 * limited rights to use, publicly perform, distribute, sell, modify,
16 * merge, give away, or sublicence.
17 *
18 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
19 * the utmost extent permitted by applicable law, neither express nor
20 * implied; without malicious intent or gross negligence. In no event
21 * may a licensor, author or contributor be held liable for indirect,
22 * direct, other damage, loss, or other issues arising in any way out
23 * of dealing in the work, even if advised of the possibility of such
24 * damage or existence of a defect, except proven that it results out
25 * of said person's immediate fault when using the work as intended.
26 */
27
28 #define EXTERN
29 #include "sh.h"
30
31 #if HAVE_LANGINFO_CODESET
32 #include <langinfo.h>
33 #endif
34 #if HAVE_SETLOCALE_CTYPE
35 #include <locale.h>
36 #endif
37
38 __RCSID("$MirOS: src/bin/mksh/main.c,v 1.351 2019/01/05 13:24:18 tg Exp $");
39
40 #ifndef MKSHRC_PATH
41 #ifndef ADAPT_FOR_LITEOS_A
42 #define MKSHRC_PATH "~/.mkshrc"
43 #else // ADAPT_FOR_LITEOS_A
44 #define MKSHRC_PATH "/etc/.mkshrc"
45 #endif // ADAPT_FOR_LITEOS_A
46 #endif
47
48 #ifndef MKSH_DEFAULT_TMPDIR
49 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp"
50 #endif
51
52 static uint8_t isuc(const char *);
53 static int main_init(int, const char *[], Source **, struct block **);
54 void chvt_reinit(void);
55 static void reclaim(void);
56 static void remove_temps(struct temp *);
57 static mksh_uari_t rndsetup(void);
58 static void init_environ(void);
59 #ifdef SIGWINCH
60 static void x_sigwinch(int);
61 #endif
62
63 static const char initsubs[] =
64 "${PS2=> }"
65 "${PS3=#? }"
66 "${PS4=+ }"
67 "${SECONDS=0}"
68 "${TMOUT=0}"
69 "${EPOCHREALTIME=}";
70
71 #ifndef MKSH_NO_INITCOMS
72 static const char *initcoms[] = {
73 Ttypeset, "-r", initvsn, NULL,
74 Ttypeset, "-x", "HOME", TPATH, TSHELL, NULL,
75 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL,
76 Talias,
77 "integer=\\\\builtin typeset -i",
78 "local=\\\\builtin typeset",
79 /* not "alias -t --": hash -r needs to work */
80 "hash=\\\\builtin alias -t",
81 "type=\\\\builtin whence -v",
82 "autoload=\\\\builtin typeset -fu",
83 "functions=\\\\builtin typeset -f",
84 "history=\\\\builtin fc -l",
85 "nameref=\\\\builtin typeset -n",
86 "nohup=nohup ",
87 "r=\\\\builtin fc -e -",
88 "login=\\\\builtin exec login",
89 NULL,
90 /* this is what AT&T ksh seems to track, with the addition of emacs */
91 Talias, "-tU",
92 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
93 "make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL,
94 NULL
95 };
96 #endif // MKSH_NO_INITCOMS
97
98 static const char *restr_com[] = {
99 Ttypeset, "-r", TPATH, "ENV", TSHELL, NULL
100 };
101
102 static bool initio_done;
103
104 /* top-level parsing and execution environment */
105 static struct env env;
106 struct env *e = &env;
107
108 /* compile-time assertions */
109 #define cta(name, expr) struct cta_ ## name { char t[(expr) ? 1 : -1]; }
110
111 /* this one should be defined by the standard */
112 cta(char_is_1_char, (sizeof(char) == 1) && (sizeof(signed char) == 1) &&
113 (sizeof(unsigned char) == 1));
114 cta(char_is_8_bits, ((CHAR_BIT) == 8) && ((int)(unsigned char)0xFF == 0xFF) &&
115 ((int)(unsigned char)0x100 == 0) && ((int)(unsigned char)(int)-1 == 0xFF));
116 /* the next assertion is probably not really needed */
117 cta(short_is_2_char, sizeof(short) == 2);
118 cta(short_size_no_matter_of_signedness, sizeof(short) == sizeof(unsigned short));
119 /* the next assertion is probably not really needed */
120 cta(int_is_4_char, sizeof(int) == 4);
121 cta(int_size_no_matter_of_signedness, sizeof(int) == sizeof(unsigned int));
122
123 cta(long_ge_int, sizeof(long) >= sizeof(int));
124 cta(long_size_no_matter_of_signedness, sizeof(long) == sizeof(unsigned long));
125
126 #ifndef MKSH_LEGACY_MODE
127 /* the next assertion is probably not really needed */
128 cta(ari_is_4_char, sizeof(mksh_ari_t) == 4);
129 /* but this is */
130 cta(ari_has_31_bit, 0 < (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1));
131 /* the next assertion is probably not really needed */
132 cta(uari_is_4_char, sizeof(mksh_uari_t) == 4);
133 /* but the next three are; we REQUIRE unsigned integer wraparound */
134 cta(uari_has_31_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 2 + 1));
135 cta(uari_has_32_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3));
136 cta(uari_wrap_32_bit,
137 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3) >
138 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 4));
139 #endif
140 /* these are always required */
141 cta(ari_is_signed, (mksh_ari_t)-1 < (mksh_ari_t)0);
142 cta(uari_is_unsigned, (mksh_uari_t)-1 > (mksh_uari_t)0);
143 /* we require these to have the precisely same size and assume 2s complement */
144 cta(ari_size_no_matter_of_signedness, sizeof(mksh_ari_t) == sizeof(mksh_uari_t));
145
146 cta(sizet_size_no_matter_of_signedness, sizeof(ssize_t) == sizeof(size_t));
147 cta(sizet_voidptr_same_size, sizeof(size_t) == sizeof(void *));
148 cta(sizet_funcptr_same_size, sizeof(size_t) == sizeof(void (*)(void)));
149 /* our formatting routines assume this */
150 cta(ptr_fits_in_long, sizeof(size_t) <= sizeof(long));
151 cta(ari_fits_in_long, sizeof(mksh_ari_t) <= sizeof(long));
152
153 static mksh_uari_t
rndsetup(void)154 rndsetup(void)
155 {
156 register uint32_t h;
157 struct {
158 ALLOC_ITEM alloc_INT;
159 void *dataptr, *stkptr, *mallocptr;
160 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
161 sigjmp_buf jbuf;
162 #endif
163 struct timeval tv;
164 } *bufptr;
165 char *cp;
166
167 cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM);
168 /* clear the allocated space, for valgrind and to avoid UB */
169 memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM));
170 /* undo what alloc() did to the malloc result address */
171 bufptr = (void *)(cp - sizeof(ALLOC_ITEM));
172 /* PIE or something similar provides us with deltas here */
173 bufptr->dataptr = &rndsetupstate;
174 /* ASLR in at least Windows, Linux, some BSDs */
175 bufptr->stkptr = &bufptr;
176 /* randomised malloc in BSD (and possibly others) */
177 bufptr->mallocptr = bufptr;
178 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
179 /* glibc pointer guard */
180 sigsetjmp(bufptr->jbuf, 1);
181 #endif
182 /* introduce variation (and yes, second arg MBZ for portability) */
183 mksh_TIME(bufptr->tv);
184
185 #ifdef MKSH_ALLOC_CATCH_UNDERRUNS
186 mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE);
187 #endif
188 h = chvt_rndsetup(bufptr, sizeof(*bufptr));
189
190 afree(cp, APERM);
191 return ((mksh_uari_t)h);
192 }
193
194 void
chvt_reinit(void)195 chvt_reinit(void)
196 {
197 kshpid = procpid = getpid();
198 ksheuid = geteuid();
199 kshpgrp = getpgrp();
200 kshppid = getppid();
201 }
202
203 static const char *empty_argv[] = {
204 Tmksh, NULL
205 };
206
207 static uint8_t
isuc(const char * cx)208 isuc(const char *cx) {
209 char *cp, *x;
210 uint8_t rv = 0;
211
212 if (!cx || !*cx)
213 return (0);
214
215 /* uppercase a string duplicate */
216 strdupx(x, cx, ATEMP);
217 cp = x;
218 while ((*cp = ksh_toupper(*cp)))
219 ++cp;
220
221 /* check for UTF-8 */
222 if (strstr(x, "UTF-8") || strstr(x, "UTF8"))
223 rv = 1;
224
225 /* free copy and out */
226 afree(x, ATEMP);
227 return (rv);
228 }
229
230 static int
main_init(int argc,const char * argv[],Source ** sp,struct block ** lp)231 main_init(int argc, const char *argv[], Source **sp, struct block **lp)
232 {
233 int argi, i;
234 Source *s = NULL;
235 struct block *l;
236 unsigned char restricted_shell, errexit, utf_flag;
237 char *cp;
238 #ifndef MKSH_NO_INITCOMS
239 const char *ccp, **wp;
240 #else
241 const char *ccp;
242 #endif // MKSH_NO_INITCOMS
243 struct tbl *vp;
244 struct stat s_stdin;
245 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
246 ssize_t k;
247 #endif
248
249 #if defined(MKSH_EBCDIC) || defined(MKSH_FAUX_EBCDIC)
250 ebcdic_init();
251 #endif
252 set_ifs(TC_IFSWS);
253
254 #ifdef __OS2__
255 os2_init(&argc, &argv);
256 #endif
257
258 /* do things like getpgrp() et al. */
259 chvt_reinit();
260
261 /* make sure argv[] is sane, for weird OSes */
262 if (!*argv) {
263 argv = empty_argv;
264 argc = 1;
265 }
266 kshname = argv[0];
267
268 /* initialise permanent Area */
269 ainit(&aperm);
270 /* max. name length: -2147483648 = 11 (+ NUL) */
271 vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM);
272
273 /* set up base environment */
274 env.type = E_NONE;
275 ainit(&env.area);
276 /* set up global l->vars and l->funs */
277 newblock();
278
279 /* Do this first so output routines (eg, errorf, shellf) can work */
280 initio();
281
282 /* determine the basename (without '-' or path) of the executable */
283 ccp = kshname;
284 goto begin_parsing_kshname;
285 while ((i = ccp[argi++])) {
286 if (mksh_cdirsep(i)) {
287 ccp += argi;
288 begin_parsing_kshname:
289 argi = 0;
290 if (*ccp == '-')
291 ++ccp;
292 }
293 }
294 if (!*ccp)
295 ccp = empty_argv[0];
296
297 /*
298 * Turn on nohup by default. (AT&T ksh does not have a nohup
299 * option - it always sends the hup).
300 */
301 Flag(FNOHUP) = 1;
302
303 /*
304 * Turn on brace expansion by default. AT&T kshs that have
305 * alternation always have it on.
306 */
307 Flag(FBRACEEXPAND) = 1;
308
309 /*
310 * Turn on "set -x" inheritance by default.
311 */
312 Flag(FXTRACEREC) = 1;
313
314 /* define built-in commands and see if we were called as one */
315 ktinit(APERM, &builtins,
316 /* currently up to 54 builtins: 75% of 128 = 2^7 */
317 7);
318 for (i = 0; mkshbuiltins[i].name != NULL; i++)
319 if (!strcmp(ccp, builtin(mkshbuiltins[i].name,
320 mkshbuiltins[i].func)))
321 Flag(FAS_BUILTIN) = 1;
322
323 if (!Flag(FAS_BUILTIN)) {
324 /* check for -T option early */
325 argi = parse_args(argv, OF_FIRSTTIME, NULL);
326 if (argi < 0)
327 return (1);
328
329 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
330 /* are we called as -sh or /bin/sh or so? */
331 if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) {
332 /* either also turns off braceexpand */
333 #ifdef MKSH_BINSHPOSIX
334 /* enable better POSIX conformance */
335 change_flag(FPOSIX, OF_FIRSTTIME, true);
336 #endif
337 #ifdef MKSH_BINSHREDUCED
338 /* enable kludge/compat mode */
339 change_flag(FSH, OF_FIRSTTIME, true);
340 #endif
341 }
342 #endif
343 }
344
345 initvar();
346
347 inittraps();
348
349 coproc_init();
350
351 /* set up variable and command dictionaries */
352 ktinit(APERM, &taliases, 0);
353 ktinit(APERM, &aliases, 0);
354 #ifndef MKSH_NOPWNAM
355 ktinit(APERM, &homedirs, 0);
356 #endif
357
358 /* define shell keywords */
359 initkeywords();
360
361 init_histvec();
362
363 /* initialise tty size before importing environment */
364 change_winsz();
365
366 #ifdef _PATH_DEFPATH
367 def_path = _PATH_DEFPATH;
368 #else
369 #ifdef _CS_PATH
370 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
371 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
372 def_path = cp;
373 else
374 #endif
375 /*
376 * this is uniform across all OSes unless it
377 * breaks somewhere hard; don't try to optimise,
378 * e.g. add stuff for Interix or remove /usr
379 * for HURD, because e.g. Debian GNU/HURD is
380 * "keeping a regular /usr"; this is supposed
381 * to be a sane 'basic' default PATH
382 */
383 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
384 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
385 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
386 MKSH_UNIXROOT "/usr/sbin";
387 #endif
388
389 /*
390 * Set PATH to def_path (will set the path global variable).
391 * (import of environment below will probably change this setting).
392 */
393 vp = global(TPATH);
394 /* setstr can't fail here */
395 setstr(vp, def_path, KSH_RETURN_ERROR);
396
397 #ifndef MKSH_NO_CMDLINE_EDITING
398 /*
399 * Set edit mode to emacs by default, may be overridden
400 * by the environment or the user. Also, we want tab completion
401 * on in vi by default.
402 */
403 change_flag(FEMACS, OF_SPECIAL, true);
404 #if !MKSH_S_NOVI
405 Flag(FVITABCOMPLETE) = 1;
406 #endif
407 #endif
408
409 /* import environment */
410 init_environ();
411
412 /* for security */
413 typeset(TinitIFS, 0, 0, 0, 0);
414
415 /* assign default shell variable values */
416 typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0);
417 substitute(initsubs, 0);
418
419 /* Figure out the current working directory and set $PWD */
420 vp = global(TPWD);
421 cp = str_val(vp);
422 /* Try to use existing $PWD if it is valid */
423 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
424 Tdot, true)) ? cp : NULL);
425 if (current_wd[0])
426 simplify_path(current_wd);
427 /* Only set pwd if we know where we are or if it had a bogus value */
428 if (current_wd[0] || *cp)
429 /* setstr can't fail here */
430 setstr(vp, current_wd, KSH_RETURN_ERROR);
431
432 #ifndef MKSH_NO_INITCOMS
433 for (wp = initcoms; *wp != NULL; wp++) {
434 c_builtin(wp);
435 while (*wp != NULL)
436 wp++;
437 }
438 #endif // MKSH_NO_INITCOMS
439 setint_n(global("OPTIND"), 1, 10);
440
441 kshuid = getuid();
442 kshgid = getgid();
443 kshegid = getegid();
444
445 safe_prompt = ksheuid ? "$ " : "# ";
446 vp = global("PS1");
447 /* Set PS1 if unset or we are root and prompt doesn't contain a # */
448 if (!(vp->flag & ISSET) ||
449 (!ksheuid && !strchr(str_val(vp), '#')))
450 /* setstr can't fail here */
451 setstr(vp, safe_prompt, KSH_RETURN_ERROR);
452 setint_n((vp = global("BASHPID")), 0, 10);
453 vp->flag |= INT_U;
454 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
455 vp->flag |= INT_U;
456 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
457 vp->flag |= INT_U;
458 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
459 vp->flag |= INT_U;
460 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
461 vp->flag |= INT_U;
462 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
463 vp->flag |= INT_U;
464 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
465 vp->flag |= INT_U;
466 setint_n((vp = global("RANDOM")), rndsetup(), 10);
467 vp->flag |= INT_U;
468 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
469
470 /* Set this before parsing arguments */
471 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
472
473 /* record if monitor is set on command line (see j_init() in jobs.c) */
474 #ifndef MKSH_UNEMPLOYED
475 Flag(FMONITOR) = 127;
476 #endif
477 /* this to note if utf-8 mode is set on command line (see below) */
478 UTFMODE = 2;
479
480 if (!Flag(FAS_BUILTIN)) {
481 argi = parse_args(argv, OF_CMDLINE, NULL);
482 if (argi < 0)
483 return (1);
484 }
485
486 /* process this later only, default to off (hysterical raisins) */
487 utf_flag = UTFMODE;
488 UTFMODE = 0;
489
490 if (Flag(FAS_BUILTIN)) {
491 /* auto-detect from environment variables, always */
492 utf_flag = 3;
493 } else if (Flag(FCOMMAND)) {
494 s = pushs(SSTRINGCMDLINE, ATEMP);
495 if (!(s->start = s->str = argv[argi++]))
496 errorf(Tf_optfoo, "", "", 'c', Treq_arg);
497 while (*s->str) {
498 if (ctype(*s->str, C_QUOTE))
499 break;
500 s->str++;
501 }
502 if (!*s->str)
503 s->flags |= SF_MAYEXEC;
504 s->str = s->start;
505 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
506 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
507 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
508 ++argi;
509 #endif
510 if (argv[argi])
511 kshname = argv[argi++];
512 } else if (argi < argc && !Flag(FSTDIN)) {
513 s = pushs(SFILE, ATEMP);
514 #ifdef __OS2__
515 /*
516 * A bug in OS/2 extproc (like shebang) handling makes
517 * it not pass the full pathname of a script, so we need
518 * to search for it. This changes the behaviour of a
519 * simple "mksh foo", but can't be helped.
520 */
521 s->file = argv[argi++];
522 if (search_access(s->file, X_OK) != 0)
523 s->file = search_path(s->file, path, X_OK, NULL);
524 if (!s->file || !*s->file)
525 s->file = argv[argi - 1];
526 #else
527 s->file = argv[argi++];
528 #endif
529 s->u.shf = shf_open(s->file, O_RDONLY | O_MAYEXEC, 0,
530 SHF_MAPHI | SHF_CLEXEC);
531 if (s->u.shf == NULL) {
532 shl_stdout_ok = false;
533 warningf(true, Tf_sD_s, s->file, cstrerror(errno));
534 /* mandated by SUSv4 */
535 exstat = 127;
536 unwind(LERROR);
537 }
538 kshname = s->file;
539 } else {
540 Flag(FSTDIN) = 1;
541 s = pushs(SSTDIN, ATEMP);
542 s->file = "<stdin>";
543 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
544 NULL);
545 if (isatty(0) && isatty(2)) {
546 Flag(FTALKING) = Flag(FTALKING_I) = 1;
547 /* The following only if isatty(0) */
548 s->flags |= SF_TTY;
549 s->u.shf->flags |= SHF_INTERRUPT;
550 s->file = NULL;
551 }
552 }
553
554 /* this bizarreness is mandated by POSIX */
555 if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
556 Flag(FTALKING))
557 reset_nonblock(0);
558
559 /* initialise job control */
560 j_init();
561 /* do this after j_init() which calls tty_init_state() */
562 if (Flag(FTALKING)) {
563 if (utf_flag == 2) {
564 #ifndef MKSH_ASSUME_UTF8
565 /* auto-detect from locale or environment */
566 utf_flag = 4;
567 #else /* this may not be an #elif */
568 #if MKSH_ASSUME_UTF8
569 utf_flag = 1;
570 #else
571 /* always disable UTF-8 (for interactive) */
572 utf_flag = 0;
573 #endif
574 #endif
575 }
576 #ifndef MKSH_NO_CMDLINE_EDITING
577 x_init();
578 #endif
579 }
580
581 #ifdef SIGWINCH
582 sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
583 setsig(&sigtraps[SIGWINCH], x_sigwinch,
584 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
585 #endif
586
587 l = e->loc;
588 if (Flag(FAS_BUILTIN)) {
589 l->argc = argc;
590 l->argv = argv;
591 l->argv[0] = ccp;
592 } else {
593 l->argc = argc - argi;
594 /*
595 * allocate a new array because otherwise, when we modify
596 * it in-place, ps(1) output changes; the meaning of argc
597 * here is slightly different as it excludes kshname, and
598 * we add a trailing NULL sentinel as well
599 */
600 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
601 l->argv[0] = kshname;
602 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
603 l->argv[l->argc + 1] = NULL;
604 getopts_reset(1);
605 }
606
607 /* divine the initial state of the utf8-mode Flag */
608 ccp = null;
609 switch (utf_flag) {
610
611 /* auto-detect from locale or environment */
612 case 4:
613 #if HAVE_SETLOCALE_CTYPE
614 ccp = setlocale(LC_CTYPE, "");
615 #if HAVE_LANGINFO_CODESET
616 if (!isuc(ccp))
617 ccp = nl_langinfo(CODESET);
618 #endif
619 if (!isuc(ccp))
620 ccp = null;
621 #endif
622 /* FALLTHROUGH */
623
624 /* auto-detect from environment */
625 case 3:
626 /* these were imported from environ earlier */
627 if (ccp == null)
628 ccp = str_val(global("LC_ALL"));
629 if (ccp == null)
630 ccp = str_val(global("LC_CTYPE"));
631 if (ccp == null)
632 ccp = str_val(global("LANG"));
633 UTFMODE = isuc(ccp);
634 break;
635
636 /* not set on command line, not FTALKING */
637 case 2:
638 /* unknown values */
639 default:
640 utf_flag = 0;
641 /* FALLTHROUGH */
642
643 /* known values */
644 case 1:
645 case 0:
646 UTFMODE = utf_flag;
647 break;
648 }
649
650 /* Disable during .profile/ENV reading */
651 restricted_shell = Flag(FRESTRICTED);
652 Flag(FRESTRICTED) = 0;
653 errexit = Flag(FERREXIT);
654 Flag(FERREXIT) = 0;
655
656 /*
657 * Do this before profile/$ENV so that if it causes problems in them,
658 * user will know why things broke.
659 */
660 if (!current_wd[0] && Flag(FTALKING))
661 warningf(false, "can't determine current directory");
662
663 if (Flag(FLOGIN))
664 include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
665 if (!Flag(FPRIVILEGED)) {
666 if (Flag(FLOGIN))
667 include(substitute("$HOME/.profile", 0), 0, NULL, true);
668 if (Flag(FTALKING)) {
669 #ifndef ADAPT_FOR_LITEOS_A
670 cp = substitute("${ENV:-" MKSHRC_PATH "}", DOTILDE);
671 #else // ADAPT_FOR_LITEOS_A
672 cp = substitute("${ENV:-" MKSHRC_PATH "}", 0);
673 #endif // ADAPT_FOR_LITEOS_A
674 if (cp[0] != '\0')
675 include(cp, 0, NULL, true);
676 }
677 } else {
678 include(MKSH_SUID_PROFILE, 0, NULL, true);
679 /* turn off -p if not set explicitly */
680 if (Flag(FPRIVILEGED) != 1)
681 change_flag(FPRIVILEGED, OF_INTERNAL, false);
682 }
683
684 if (restricted_shell) {
685 c_builtin(restr_com);
686 /* After typeset command... */
687 Flag(FRESTRICTED) = 1;
688 }
689 Flag(FERREXIT) = errexit;
690
691 if (Flag(FTALKING) && s)
692 hist_init(s);
693 else
694 /* set after ENV */
695 Flag(FTRACKALL) = 1;
696
697 alarm_init();
698
699 *sp = s;
700 *lp = l;
701 return (0);
702 }
703
704 /* this indirection barrier reduces stack usage during normal operation */
705
706 int
main(int argc,const char * argv[])707 main(int argc, const char *argv[])
708 {
709 int rv;
710 Source *s;
711 struct block *l;
712
713 if ((rv = main_init(argc, argv, &s, &l)) == 0) {
714 if (Flag(FAS_BUILTIN)) {
715 rv = c_builtin(l->argv);
716 } else {
717 shell(s, 0);
718 /* NOTREACHED */
719 }
720 }
721 return (rv);
722 }
723
724 int
include(const char * name,int argc,const char ** argv,bool intr_ok)725 include(const char *name, int argc, const char **argv, bool intr_ok)
726 {
727 Source *volatile s = NULL;
728 struct shf *shf;
729 const char **volatile old_argv;
730 volatile int old_argc;
731 int i;
732
733 shf = shf_open(name, O_RDONLY | O_MAYEXEC, 0, SHF_MAPHI | SHF_CLEXEC);
734 if (shf == NULL)
735 return (-1);
736
737 if (argv) {
738 old_argv = e->loc->argv;
739 old_argc = e->loc->argc;
740 } else {
741 old_argv = NULL;
742 old_argc = 0;
743 }
744 newenv(E_INCL);
745 if ((i = kshsetjmp(e->jbuf))) {
746 quitenv(s ? s->u.shf : NULL);
747 if (old_argv) {
748 e->loc->argv = old_argv;
749 e->loc->argc = old_argc;
750 }
751 switch (i) {
752 case LRETURN:
753 case LERROR:
754 /* see below */
755 return (exstat & 0xFF);
756 case LINTR:
757 /*
758 * intr_ok is set if we are including .profile or $ENV.
759 * If user ^Cs out, we don't want to kill the shell...
760 */
761 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
762 return (1);
763 /* FALLTHROUGH */
764 case LEXIT:
765 case LLEAVE:
766 case LSHELL:
767 unwind(i);
768 /* NOTREACHED */
769 default:
770 internal_errorf(Tunexpected_type, Tunwind, Tsource, i);
771 /* NOTREACHED */
772 }
773 }
774 if (argv) {
775 e->loc->argv = argv;
776 e->loc->argc = argc;
777 }
778 s = pushs(SFILE, ATEMP);
779 s->u.shf = shf;
780 strdupx(s->file, name, ATEMP);
781 i = shell(s, 1);
782 quitenv(s->u.shf);
783 if (old_argv) {
784 e->loc->argv = old_argv;
785 e->loc->argc = old_argc;
786 }
787 /* & 0xff to ensure value not -1 */
788 return (i & 0xFF);
789 }
790
791 /* spawn a command into a shell optionally keeping track of the line number */
792 int
command(const char * comm,int line)793 command(const char *comm, int line)
794 {
795 Source *s, *sold = source;
796 int rv;
797
798 s = pushs(SSTRING, ATEMP);
799 s->start = s->str = comm;
800 s->line = line;
801 rv = shell(s, 1);
802 source = sold;
803 return (rv);
804 }
805
806 /*
807 * run the commands from the input source, returning status.
808 */
809 int
shell(Source * volatile s,volatile int level)810 shell(Source * volatile s, volatile int level)
811 {
812 struct op *t;
813 volatile bool wastty = tobool(s->flags & SF_TTY);
814 volatile uint8_t attempts = 13;
815 volatile bool interactive = (level == 0) && Flag(FTALKING);
816 volatile bool sfirst = true;
817 Source *volatile old_source = source;
818 int i;
819
820 newenv(level == 2 ? E_EVAL : E_PARSE);
821 if (interactive)
822 really_exit = false;
823 switch ((i = kshsetjmp(e->jbuf))) {
824 case 0:
825 break;
826 case LBREAK:
827 case LCONTIN:
828 if (level != 2) {
829 source = old_source;
830 quitenv(NULL);
831 internal_errorf(Tf_cant_s, Tshell,
832 i == LBREAK ? Tbreak : Tcontinue);
833 /* NOTREACHED */
834 }
835 /* assert: interactive == false */
836 /* FALLTHROUGH */
837 case LINTR:
838 /* we get here if SIGINT not caught or ignored */
839 case LERROR:
840 case LSHELL:
841 if (interactive) {
842 if (i == LINTR)
843 shellf("\n");
844 /*
845 * Reset any eof that was read as part of a
846 * multiline command.
847 */
848 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
849 s->type = SSTDIN;
850 /*
851 * Used by exit command to get back to
852 * top level shell. Kind of strange since
853 * interactive is set if we are reading from
854 * a tty, but to have stopped jobs, one only
855 * needs FMONITOR set (not FTALKING/SF_TTY)...
856 */
857 /* toss any input we have so far */
858 yyrecursive_pop(true);
859 s->start = s->str = null;
860 retrace_info = NULL;
861 herep = heres;
862 break;
863 }
864 /* FALLTHROUGH */
865 case LEXIT:
866 case LLEAVE:
867 case LRETURN:
868 source = old_source;
869 quitenv(NULL);
870 /* keep on going */
871 unwind(i);
872 /* NOTREACHED */
873 default:
874 source = old_source;
875 quitenv(NULL);
876 internal_errorf(Tunexpected_type, Tunwind, Tshell, i);
877 /* NOTREACHED */
878 }
879 while (/* CONSTCOND */ 1) {
880 if (trap)
881 runtraps(0);
882
883 if (s->next == NULL) {
884 if (Flag(FVERBOSE))
885 s->flags |= SF_ECHO;
886 else
887 s->flags &= ~SF_ECHO;
888 }
889 if (interactive) {
890 j_notify();
891 set_prompt(PS1, s);
892 }
893 t = compile(s, sfirst, true);
894 if (interactive)
895 histsave(&s->line, NULL, HIST_FLUSH, true);
896 sfirst = false;
897 if (!t)
898 goto source_no_tree;
899 if (t->type == TEOF) {
900 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
901 shellf("Use 'exit' to leave mksh\n");
902 s->type = SSTDIN;
903 } else if (wastty && !really_exit &&
904 j_stopped_running()) {
905 really_exit = true;
906 s->type = SSTDIN;
907 } else {
908 /*
909 * this for POSIX which says EXIT traps
910 * shall be taken in the environment
911 * immediately after the last command
912 * executed.
913 */
914 if (level == 0)
915 unwind(LEXIT);
916 break;
917 }
918 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM)
919 t->u.evalflags |= DOTCOMEXEC;
920 if (!Flag(FNOEXEC) || (s->flags & SF_TTY))
921 exstat = execute(t, 0, NULL) & 0xFF;
922
923 if (t->type != TEOF && interactive && really_exit)
924 really_exit = false;
925
926 source_no_tree:
927 reclaim();
928 }
929 quitenv(NULL);
930 source = old_source;
931 return (exstat & 0xFF);
932 }
933
934 /* return to closest error handler or shell(), exit if none found */
935 /* note: i MUST NOT be 0 */
936 void
unwind(int i)937 unwind(int i)
938 {
939 /*
940 * This is a kludge. We need to restore everything that was
941 * changed in the new environment, see cid 1005090337C7A669439
942 * and 10050903386452ACBF1, but fail to even save things most of
943 * the time. funcs.c:c_eval() changes FERREXIT temporarily to 0,
944 * which needs to be restored thus (related to Debian #696823).
945 * We did not save the shell flags, so we use a special or'd
946 * value here... this is mostly to clean up behind *other*
947 * callers of unwind(LERROR) here; exec.c has the regular case.
948 */
949 if (Flag(FERREXIT) & 0x80) {
950 /* GNU bash does not run this trapsig */
951 trapsig(ksh_SIGERR);
952 Flag(FERREXIT) &= ~0x80;
953 }
954
955 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
956 if (i == LEXIT || ((i == LERROR || i == LINTR) &&
957 sigtraps[ksh_SIGEXIT].trap &&
958 (!Flag(FTALKING) || Flag(FERREXIT)))) {
959 ++trap_nested;
960 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
961 --trap_nested;
962 i = LLEAVE;
963 } else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) {
964 ++trap_nested;
965 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
966 --trap_nested;
967 i = LLEAVE;
968 }
969
970 while (/* CONSTCOND */ 1) {
971 switch (e->type) {
972 case E_PARSE:
973 case E_FUNC:
974 case E_INCL:
975 case E_LOOP:
976 case E_ERRH:
977 case E_EVAL:
978 kshlongjmp(e->jbuf, i);
979 /* NOTREACHED */
980 case E_NONE:
981 if (i == LINTR)
982 e->flags |= EF_FAKE_SIGDIE;
983 /* FALLTHROUGH */
984 default:
985 quitenv(NULL);
986 }
987 }
988 }
989
990 void
newenv(int type)991 newenv(int type)
992 {
993 struct env *ep;
994 char *cp;
995
996 /*
997 * struct env includes ALLOC_ITEM for alignment constraints
998 * so first get the actually used memory, then assign it
999 */
1000 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP);
1001 /* undo what alloc() did to the malloc result address */
1002 ep = (void *)(cp - sizeof(ALLOC_ITEM));
1003 /* initialise public members of struct env (not the ALLOC_ITEM) */
1004 ainit(&ep->area);
1005 ep->oenv = e;
1006 ep->loc = e->loc;
1007 ep->savefd = NULL;
1008 ep->temps = NULL;
1009 ep->yyrecursive_statep = NULL;
1010 ep->type = type;
1011 ep->flags = 0;
1012 /* jump buffer is invalid because flags == 0 */
1013 e = ep;
1014 }
1015
1016 void
quitenv(struct shf * shf)1017 quitenv(struct shf *shf)
1018 {
1019 struct env *ep = e;
1020 char *cp;
1021 int fd;
1022
1023 yyrecursive_pop(true);
1024 while (ep->oenv && ep->oenv->loc != ep->loc)
1025 popblock();
1026 if (ep->savefd != NULL) {
1027 for (fd = 0; fd < NUFILE; fd++)
1028 /* if ep->savefd[fd] < 0, means fd was closed */
1029 if (ep->savefd[fd])
1030 restfd(fd, ep->savefd[fd]);
1031 if (ep->savefd[2])
1032 /* Clear any write errors */
1033 shf_reopen(2, SHF_WR, shl_out);
1034 }
1035 /*
1036 * Bottom of the stack.
1037 * Either main shell is exiting or cleanup_parents_env() was called.
1038 */
1039 if (ep->oenv == NULL) {
1040 #ifdef DEBUG_LEAKS
1041 int i;
1042 #endif
1043
1044 if (ep->type == E_NONE) {
1045 /* Main shell exiting? */
1046 #if HAVE_PERSISTENT_HISTORY
1047 if (Flag(FTALKING))
1048 hist_finish();
1049 #endif
1050 j_exit();
1051 if (ep->flags & EF_FAKE_SIGDIE) {
1052 int sig = (exstat & 0xFF) - 128;
1053
1054 /*
1055 * ham up our death a bit (AT&T ksh
1056 * only seems to do this for SIGTERM)
1057 * Don't do it for SIGQUIT, since we'd
1058 * dump a core..
1059 */
1060 if ((sig == SIGINT || sig == SIGTERM) &&
1061 (kshpgrp == kshpid)) {
1062 setsig(&sigtraps[sig], SIG_DFL,
1063 SS_RESTORE_CURR | SS_FORCE);
1064 kill(0, sig);
1065 }
1066 }
1067 }
1068 if (shf)
1069 shf_close(shf);
1070 reclaim();
1071 #ifdef DEBUG_LEAKS
1072 #ifndef MKSH_NO_CMDLINE_EDITING
1073 x_done();
1074 #endif
1075 #ifndef MKSH_NOPROSPECTOFWORK
1076 /* block at least SIGCHLD during/after afreeall */
1077 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
1078 #endif
1079 afreeall(APERM);
1080 for (fd = 3; fd < NUFILE; fd++)
1081 if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
1082 (i & FD_CLOEXEC))
1083 close(fd);
1084 close(2);
1085 close(1);
1086 close(0);
1087 #endif
1088 exit(exstat & 0xFF);
1089 }
1090 if (shf)
1091 shf_close(shf);
1092 reclaim();
1093
1094 e = e->oenv;
1095
1096 /* free the struct env - tricky due to the ALLOC_ITEM inside */
1097 cp = (void *)ep;
1098 afree(cp + sizeof(ALLOC_ITEM), ATEMP);
1099 }
1100
1101 /* Called after a fork to cleanup stuff left over from parents environment */
1102 void
cleanup_parents_env(void)1103 cleanup_parents_env(void)
1104 {
1105 struct env *ep;
1106 int fd;
1107
1108 /*
1109 * Don't clean up temporary files - parent will probably need them.
1110 * Also, can't easily reclaim memory since variables, etc. could be
1111 * anywhere.
1112 */
1113
1114 /* close all file descriptors hiding in savefd */
1115 for (ep = e; ep; ep = ep->oenv) {
1116 if (ep->savefd) {
1117 for (fd = 0; fd < NUFILE; fd++)
1118 if (ep->savefd[fd] > 0)
1119 close(ep->savefd[fd]);
1120 afree(ep->savefd, &ep->area);
1121 ep->savefd = NULL;
1122 }
1123 #ifdef DEBUG_LEAKS
1124 if (ep->type != E_NONE)
1125 ep->type = E_GONE;
1126 #endif
1127 }
1128 #ifndef DEBUG_LEAKS
1129 e->oenv = NULL;
1130 #endif
1131 }
1132
1133 /* Called just before an execve cleanup stuff temporary files */
1134 void
cleanup_proc_env(void)1135 cleanup_proc_env(void)
1136 {
1137 struct env *ep;
1138
1139 for (ep = e; ep; ep = ep->oenv)
1140 remove_temps(ep->temps);
1141 }
1142
1143 /* remove temp files and free ATEMP Area */
1144 static void
reclaim(void)1145 reclaim(void)
1146 {
1147 struct block *l;
1148
1149 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) {
1150 e->loc = l->next;
1151 afreeall(&l->area);
1152 }
1153
1154 remove_temps(e->temps);
1155 e->temps = NULL;
1156
1157 /*
1158 * if the memory backing source is reclaimed, things
1159 * will end up badly when a function expecting it to
1160 * be valid is run; a NULL pointer is easily debugged
1161 */
1162 if (source && source->areap == &e->area)
1163 source = NULL;
1164 afreeall(&e->area);
1165 }
1166
1167 static void
remove_temps(struct temp * tp)1168 remove_temps(struct temp *tp)
1169 {
1170 while (tp) {
1171 if (tp->pid == procpid)
1172 unlink(tp->tffn);
1173 tp = tp->next;
1174 }
1175 }
1176
1177 /*
1178 * Initialise tty_fd. Used for tracking the size of the terminal,
1179 * saving/resetting tty modes upon forground job completion, and
1180 * for setting up the tty process group. Return values:
1181 * 0 = got controlling tty
1182 * 1 = got terminal but no controlling tty
1183 * 2 = cannot find a terminal
1184 * 3 = cannot dup fd
1185 * 4 = cannot make fd close-on-exec
1186 * An existing tty_fd is cached if no "better" one could be found,
1187 * i.e. if tty_devtty was already set or the new would not set it.
1188 */
1189 int
tty_init_fd(void)1190 tty_init_fd(void)
1191 {
1192 int fd, rv, eno = 0;
1193 bool do_close = false, is_devtty = true;
1194
1195 if (tty_devtty) {
1196 /* already got a tty which is /dev/tty */
1197 return (0);
1198 }
1199
1200 #ifdef _UWIN
1201 /*XXX imake style */
1202 if (isatty(3)) {
1203 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */
1204 fd = 3;
1205 goto got_fd;
1206 }
1207 #endif
1208 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) {
1209 do_close = true;
1210 goto got_fd;
1211 }
1212 eno = errno;
1213
1214 if (tty_fd >= 0) {
1215 /* already got a non-devtty one */
1216 rv = 1;
1217 goto out;
1218 }
1219 is_devtty = false;
1220
1221 if (isatty((fd = 0)) || isatty((fd = 2)))
1222 goto got_fd;
1223 /* cannot find one */
1224 rv = 2;
1225 /* assert: do_close == false */
1226 goto out;
1227
1228 got_fd:
1229 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) {
1230 eno = errno;
1231 rv = 3;
1232 goto out;
1233 }
1234 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) {
1235 eno = errno;
1236 close(rv);
1237 rv = 4;
1238 goto out;
1239 }
1240 tty_fd = rv;
1241 tty_devtty = is_devtty;
1242 rv = eno = 0;
1243 out:
1244 if (do_close)
1245 close(fd);
1246 errno = eno;
1247 return (rv);
1248 }
1249
1250 /* A shell error occurred (eg, syntax error, etc.) */
1251
1252 #define VWARNINGF_ERRORPREFIX 1
1253 #define VWARNINGF_FILELINE 2
1254 #define VWARNINGF_BUILTIN 4
1255 #define VWARNINGF_INTERNAL 8
1256
1257 static void vwarningf(unsigned int, const char *, va_list)
1258 MKSH_A_FORMAT(__printf__, 2, 0);
1259
1260 static void
vwarningf(unsigned int flags,const char * fmt,va_list ap)1261 vwarningf(unsigned int flags, const char *fmt, va_list ap)
1262 {
1263 if (fmt) {
1264 if (flags & VWARNINGF_INTERNAL)
1265 shf_fprintf(shl_out, Tf_sD_, "internal error");
1266 if (flags & VWARNINGF_ERRORPREFIX)
1267 error_prefix(tobool(flags & VWARNINGF_FILELINE));
1268 if ((flags & VWARNINGF_BUILTIN) &&
1269 /* not set when main() calls parse_args() */
1270 builtin_argv0 && builtin_argv0 != kshname)
1271 shf_fprintf(shl_out, Tf_sD_, builtin_argv0);
1272 shf_vfprintf(shl_out, fmt, ap);
1273 shf_putchar('\n', shl_out);
1274 }
1275 shf_flush(shl_out);
1276 }
1277
1278 void
errorfx(int rc,const char * fmt,...)1279 errorfx(int rc, const char *fmt, ...)
1280 {
1281 va_list va;
1282
1283 exstat = rc;
1284
1285 /* debugging: note that stdout not valid */
1286 shl_stdout_ok = false;
1287
1288 va_start(va, fmt);
1289 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1290 va_end(va);
1291 unwind(LERROR);
1292 }
1293
1294 void
errorf(const char * fmt,...)1295 errorf(const char *fmt, ...)
1296 {
1297 va_list va;
1298
1299 exstat = 1;
1300
1301 /* debugging: note that stdout not valid */
1302 shl_stdout_ok = false;
1303
1304 va_start(va, fmt);
1305 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1306 va_end(va);
1307 unwind(LERROR);
1308 }
1309
1310 /* like errorf(), but no unwind is done */
1311 void
warningf(bool fileline,const char * fmt,...)1312 warningf(bool fileline, const char *fmt, ...)
1313 {
1314 va_list va;
1315
1316 va_start(va, fmt);
1317 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0),
1318 fmt, va);
1319 va_end(va);
1320 }
1321
1322 /*
1323 * Used by built-in utilities to prefix shell and utility name to message
1324 * (also unwinds environments for special builtins).
1325 */
1326 void
bi_errorf(const char * fmt,...)1327 bi_errorf(const char *fmt, ...)
1328 {
1329 va_list va;
1330
1331 /* debugging: note that stdout not valid */
1332 shl_stdout_ok = false;
1333
1334 exstat = 1;
1335
1336 va_start(va, fmt);
1337 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1338 VWARNINGF_BUILTIN, fmt, va);
1339 va_end(va);
1340
1341 /* POSIX special builtins cause non-interactive shells to exit */
1342 if (builtin_spec) {
1343 builtin_argv0 = NULL;
1344 /* may not want to use LERROR here */
1345 unwind(LERROR);
1346 }
1347 }
1348
1349 /* Called when something that shouldn't happen does */
1350 void
internal_errorf(const char * fmt,...)1351 internal_errorf(const char *fmt, ...)
1352 {
1353 va_list va;
1354
1355 va_start(va, fmt);
1356 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1357 va_end(va);
1358 unwind(LERROR);
1359 }
1360
1361 void
internal_warningf(const char * fmt,...)1362 internal_warningf(const char *fmt, ...)
1363 {
1364 va_list va;
1365
1366 va_start(va, fmt);
1367 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1368 va_end(va);
1369 }
1370
1371 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
1372 void
error_prefix(bool fileline)1373 error_prefix(bool fileline)
1374 {
1375 /* Avoid foo: foo[2]: ... */
1376 if (!fileline || !source || !source->file ||
1377 strcmp(source->file, kshname) != 0)
1378 shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-'));
1379 if (fileline && source && source->file != NULL) {
1380 shf_fprintf(shl_out, "%s[%lu]: ", source->file,
1381 (unsigned long)(source->errline ?
1382 source->errline : source->line));
1383 source->errline = 0;
1384 }
1385 }
1386
1387 /* printf to shl_out (stderr) with flush */
1388 void
shellf(const char * fmt,...)1389 shellf(const char *fmt, ...)
1390 {
1391 va_list va;
1392
1393 if (!initio_done)
1394 /* shl_out may not be set up yet... */
1395 return;
1396 va_start(va, fmt);
1397 shf_vfprintf(shl_out, fmt, va);
1398 va_end(va);
1399 shf_flush(shl_out);
1400 }
1401
1402 /* printf to shl_stdout (stdout) */
1403 void
shprintf(const char * fmt,...)1404 shprintf(const char *fmt, ...)
1405 {
1406 va_list va;
1407
1408 if (!shl_stdout_ok)
1409 internal_errorf("shl_stdout not valid");
1410 va_start(va, fmt);
1411 shf_vfprintf(shl_stdout, fmt, va);
1412 va_end(va);
1413 }
1414
1415 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
1416 int
can_seek(int fd)1417 can_seek(int fd)
1418 {
1419 struct stat statb;
1420
1421 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
1422 SHF_UNBUF : 0);
1423 }
1424
1425 #ifdef DF
1426 int shl_dbg_fd;
1427 #define NSHF_IOB 4
1428 #else
1429 #define NSHF_IOB 3
1430 #endif
1431 struct shf shf_iob[NSHF_IOB];
1432
1433 void
initio(void)1434 initio(void)
1435 {
1436 #ifdef DF
1437 const char *lfp;
1438 #endif
1439
1440 /* force buffer allocation */
1441 shf_fdopen(1, SHF_WR, shl_stdout);
1442 shf_fdopen(2, SHF_WR, shl_out);
1443 shf_fdopen(2, SHF_WR, shl_xtrace);
1444 #ifdef DF
1445 if ((lfp = getenv("SDMKSH_PATH")) == NULL) {
1446 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp))
1447 errorf("can't get home directory");
1448 lfp = shf_smprintf(Tf_sSs, lfp, "mksh-dbg.txt");
1449 }
1450
1451 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0)
1452 errorf("can't open debug output file %s", lfp);
1453 if (shl_dbg_fd < FDBASE) {
1454 int nfd;
1455
1456 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE);
1457 close(shl_dbg_fd);
1458 if ((shl_dbg_fd = nfd) == -1)
1459 errorf("can't dup debug output file");
1460 }
1461 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC);
1462 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg);
1463 DF("=== open ===");
1464 #endif
1465 initio_done = true;
1466 }
1467
1468 /* A dup2() with error checking */
1469 int
ksh_dup2(int ofd,int nfd,bool errok)1470 ksh_dup2(int ofd, int nfd, bool errok)
1471 {
1472 int rv;
1473
1474 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
1475 errorf(Ttoo_many_files);
1476
1477 #ifdef __ultrix
1478 /*XXX imake style */
1479 if (rv >= 0)
1480 fcntl(nfd, F_SETFD, 0);
1481 #endif
1482
1483 return (rv);
1484 }
1485
1486 /*
1487 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10),
1488 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here.
1489 */
1490 short
savefd(int fd)1491 savefd(int fd)
1492 {
1493 int nfd = fd;
1494
1495 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
1496 (errno == EBADF || errno == EPERM))
1497 return (-1);
1498 if (nfd < 0 || nfd > SHRT_MAX)
1499 errorf(Ttoo_many_files);
1500 fcntl(nfd, F_SETFD, FD_CLOEXEC);
1501 return ((short)nfd);
1502 }
1503
1504 void
restfd(int fd,int ofd)1505 restfd(int fd, int ofd)
1506 {
1507 if (fd == 2)
1508 shf_flush(&shf_iob[/* fd */ 2]);
1509 if (ofd < 0)
1510 /* original fd closed */
1511 close(fd);
1512 else if (fd != ofd) {
1513 /*XXX: what to do if this dup fails? */
1514 ksh_dup2(ofd, fd, true);
1515 close(ofd);
1516 }
1517 }
1518
1519 void
openpipe(int * pv)1520 openpipe(int *pv)
1521 {
1522 int lpv[2];
1523
1524 if (pipe(lpv) < 0)
1525 errorf("can't create pipe - try again");
1526 pv[0] = savefd(lpv[0]);
1527 if (pv[0] != lpv[0])
1528 close(lpv[0]);
1529 pv[1] = savefd(lpv[1]);
1530 if (pv[1] != lpv[1])
1531 close(lpv[1]);
1532 #ifdef __OS2__
1533 setmode(pv[0], O_BINARY);
1534 setmode(pv[1], O_BINARY);
1535 #endif
1536 }
1537
1538 void
closepipe(int * pv)1539 closepipe(int *pv)
1540 {
1541 close(pv[0]);
1542 close(pv[1]);
1543 }
1544
1545 /*
1546 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
1547 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
1548 */
1549 int
check_fd(const char * name,int mode,const char ** emsgp)1550 check_fd(const char *name, int mode, const char **emsgp)
1551 {
1552 int fd, fl;
1553
1554 if (!name[0] || name[1])
1555 goto illegal_fd_name;
1556 if (name[0] == 'p')
1557 return (coproc_getfd(mode, emsgp));
1558 if (!ctype(name[0], C_DIGIT)) {
1559 illegal_fd_name:
1560 if (emsgp)
1561 *emsgp = "illegal file descriptor name";
1562 return (-1);
1563 }
1564
1565 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) {
1566 if (emsgp)
1567 *emsgp = "bad file descriptor";
1568 return (-1);
1569 }
1570 fl &= O_ACCMODE;
1571 /*
1572 * X_OK is a kludge to disable this check for dups (x<&1):
1573 * historical shells never did this check (XXX don't know what
1574 * POSIX has to say).
1575 */
1576 if (!(mode & X_OK) && fl != O_RDWR && (
1577 ((mode & R_OK) && fl != O_RDONLY) ||
1578 ((mode & W_OK) && fl != O_WRONLY))) {
1579 if (emsgp)
1580 *emsgp = (fl == O_WRONLY) ?
1581 "fd not open for reading" :
1582 "fd not open for writing";
1583 return (-1);
1584 }
1585 return (fd);
1586 }
1587
1588 /* Called once from main */
1589 void
coproc_init(void)1590 coproc_init(void)
1591 {
1592 coproc.read = coproc.readw = coproc.write = -1;
1593 coproc.njobs = 0;
1594 coproc.id = 0;
1595 }
1596
1597 /* Called by c_read() when eof is read - close fd if it is the co-process fd */
1598 void
coproc_read_close(int fd)1599 coproc_read_close(int fd)
1600 {
1601 if (coproc.read >= 0 && fd == coproc.read) {
1602 coproc_readw_close(fd);
1603 close(coproc.read);
1604 coproc.read = -1;
1605 }
1606 }
1607
1608 /*
1609 * Called by c_read() and by iosetup() to close the other side of the
1610 * read pipe, so reads will actually terminate.
1611 */
1612 void
coproc_readw_close(int fd)1613 coproc_readw_close(int fd)
1614 {
1615 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
1616 close(coproc.readw);
1617 coproc.readw = -1;
1618 }
1619 }
1620
1621 /*
1622 * Called by c_print when a write to a fd fails with EPIPE and by iosetup
1623 * when co-process input is dup'd
1624 */
1625 void
coproc_write_close(int fd)1626 coproc_write_close(int fd)
1627 {
1628 if (coproc.write >= 0 && fd == coproc.write) {
1629 close(coproc.write);
1630 coproc.write = -1;
1631 }
1632 }
1633
1634 /*
1635 * Called to check for existence of/value of the co-process file descriptor.
1636 * (Used by check_fd() and by c_read/c_print to deal with -p option).
1637 */
1638 int
coproc_getfd(int mode,const char ** emsgp)1639 coproc_getfd(int mode, const char **emsgp)
1640 {
1641 int fd = (mode & R_OK) ? coproc.read : coproc.write;
1642
1643 if (fd >= 0)
1644 return (fd);
1645 if (emsgp)
1646 *emsgp = "no coprocess";
1647 return (-1);
1648 }
1649
1650 /*
1651 * called to close file descriptors related to the coprocess (if any)
1652 * Should be called with SIGCHLD blocked.
1653 */
1654 void
coproc_cleanup(int reuse)1655 coproc_cleanup(int reuse)
1656 {
1657 /* This to allow co-processes to share output pipe */
1658 if (!reuse || coproc.readw < 0 || coproc.read < 0) {
1659 if (coproc.read >= 0) {
1660 close(coproc.read);
1661 coproc.read = -1;
1662 }
1663 if (coproc.readw >= 0) {
1664 close(coproc.readw);
1665 coproc.readw = -1;
1666 }
1667 }
1668 if (coproc.write >= 0) {
1669 close(coproc.write);
1670 coproc.write = -1;
1671 }
1672 }
1673
1674 struct temp *
maketemp(Area * ap,Temp_type type,struct temp ** tlist)1675 maketemp(Area *ap, Temp_type type, struct temp **tlist)
1676 {
1677 char *cp;
1678 size_t len;
1679 int i, j;
1680 struct temp *tp;
1681 const char *dir;
1682 struct stat sb;
1683
1684 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
1685 /* add "/shXXXXXX.tmp" plus NUL */
1686 len = strlen(dir);
1687 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
1688 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
1689
1690 tp->shf = NULL;
1691 tp->pid = procpid;
1692 tp->type = type;
1693
1694 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
1695 tp->tffn[0] = '\0';
1696 goto maketemp_out;
1697 }
1698
1699 cp = (void *)tp;
1700 cp += offsetof(struct temp, tffn[0]);
1701 memcpy(cp, dir, len);
1702 cp += len;
1703 memcpy(cp, "/shXXXXXX.tmp", 14);
1704 /* point to the first of six Xes */
1705 cp += 3;
1706
1707 /* cyclically attempt to open a temporary file */
1708 do {
1709 /* generate random part of filename */
1710 len = 0;
1711 do {
1712 cp[len++] = digits_lc[rndget() % 36];
1713 } while (len < 6);
1714
1715 /* check if this one works */
1716 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR,
1717 0600)) < 0 && errno != EEXIST)
1718 goto maketemp_out;
1719 } while (i < 0);
1720
1721 if (type == TT_FUNSUB) {
1722 /* map us high and mark as close-on-exec */
1723 if ((j = savefd(i)) != i) {
1724 close(i);
1725 i = j;
1726 }
1727
1728 /* operation mode for the shf */
1729 j = SHF_RD;
1730 } else
1731 j = SHF_WR;
1732
1733 /* shf_fdopen cannot fail, so no fd leak */
1734 tp->shf = shf_fdopen(i, j, NULL);
1735
1736 maketemp_out:
1737 tp->next = *tlist;
1738 *tlist = tp;
1739 return (tp);
1740 }
1741
1742 /*
1743 * We use a similar collision resolution algorithm as Python 2.5.4
1744 * but with a slightly tweaked implementation written from scratch.
1745 */
1746
1747 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */
1748 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
1749
1750 static void tgrow(struct table *);
1751 static int tnamecmp(const void *, const void *);
1752
1753 static void
tgrow(struct table * tp)1754 tgrow(struct table *tp)
1755 {
1756 size_t i, j, osize, mask, perturb;
1757 struct tbl *tblp, **pp;
1758 struct tbl **ntblp, **otblp = tp->tbls;
1759
1760 if (tp->tshift > 29)
1761 internal_errorf("hash table size limit reached");
1762
1763 /* calculate old size, new shift and new size */
1764 osize = (size_t)1 << (tp->tshift++);
1765 i = osize << 1;
1766
1767 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap);
1768 /* multiplication cannot overflow: alloc2 checked that */
1769 memset(ntblp, 0, i * sizeof(struct tbl *));
1770
1771 /* table can get very full when reaching its size limit */
1772 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL :
1773 /* but otherwise, only 75% */
1774 ((i * 3) / 4);
1775 tp->tbls = ntblp;
1776 if (otblp == NULL)
1777 return;
1778
1779 mask = i - 1;
1780 for (i = 0; i < osize; i++)
1781 if ((tblp = otblp[i]) != NULL) {
1782 if ((tblp->flag & DEFINED)) {
1783 /* search for free hash table slot */
1784 j = perturb = tblp->ua.hval;
1785 goto find_first_empty_slot;
1786 find_next_empty_slot:
1787 j = (j << 2) + j + perturb + 1;
1788 perturb >>= PERTURB_SHIFT;
1789 find_first_empty_slot:
1790 pp = &ntblp[j & mask];
1791 if (*pp != NULL)
1792 goto find_next_empty_slot;
1793 /* found an empty hash table slot */
1794 *pp = tblp;
1795 tp->nfree--;
1796 } else if (!(tblp->flag & FINUSE)) {
1797 afree(tblp, tp->areap);
1798 }
1799 }
1800 afree(otblp, tp->areap);
1801 }
1802
1803 void
ktinit(Area * ap,struct table * tp,uint8_t initshift)1804 ktinit(Area *ap, struct table *tp, uint8_t initshift)
1805 {
1806 tp->areap = ap;
1807 tp->tbls = NULL;
1808 tp->tshift = ((initshift > INIT_TBLSHIFT) ?
1809 initshift : INIT_TBLSHIFT) - 1;
1810 tgrow(tp);
1811 }
1812
1813 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
1814 struct tbl *
ktscan(struct table * tp,const char * name,uint32_t h,struct tbl *** ppp)1815 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
1816 {
1817 size_t j, perturb, mask;
1818 struct tbl **pp, *p;
1819
1820 mask = ((size_t)1 << (tp->tshift)) - 1;
1821 /* search for hash table slot matching name */
1822 j = perturb = h;
1823 goto find_first_slot;
1824 find_next_slot:
1825 j = (j << 2) + j + perturb + 1;
1826 perturb >>= PERTURB_SHIFT;
1827 find_first_slot:
1828 pp = &tp->tbls[j & mask];
1829 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
1830 strcmp(p->name, name)))
1831 goto find_next_slot;
1832 /* p == NULL if not found, correct found entry otherwise */
1833 if (ppp)
1834 *ppp = pp;
1835 return (p);
1836 }
1837
1838 /* table, name (key) to enter, hash(n) */
1839 struct tbl *
ktenter(struct table * tp,const char * n,uint32_t h)1840 ktenter(struct table *tp, const char *n, uint32_t h)
1841 {
1842 struct tbl **pp, *p;
1843 size_t len;
1844
1845 Search:
1846 if ((p = ktscan(tp, n, h, &pp)))
1847 return (p);
1848
1849 if (tp->nfree == 0) {
1850 /* too full */
1851 tgrow(tp);
1852 goto Search;
1853 }
1854
1855 /* create new tbl entry */
1856 len = strlen(n);
1857 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1);
1858 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap);
1859 p->flag = 0;
1860 p->type = 0;
1861 p->areap = tp->areap;
1862 p->ua.hval = h;
1863 p->u2.field = 0;
1864 p->u.array = NULL;
1865 memcpy(p->name, n, len);
1866
1867 /* enter in tp->tbls */
1868 tp->nfree--;
1869 *pp = p;
1870 return (p);
1871 }
1872
1873 void
ktwalk(struct tstate * ts,struct table * tp)1874 ktwalk(struct tstate *ts, struct table *tp)
1875 {
1876 ts->left = (size_t)1 << (tp->tshift);
1877 ts->next = tp->tbls;
1878 }
1879
1880 struct tbl *
ktnext(struct tstate * ts)1881 ktnext(struct tstate *ts)
1882 {
1883 while (--ts->left >= 0) {
1884 struct tbl *p = *ts->next++;
1885 if (p != NULL && (p->flag & DEFINED))
1886 return (p);
1887 }
1888 return (NULL);
1889 }
1890
1891 static int
tnamecmp(const void * p1,const void * p2)1892 tnamecmp(const void *p1, const void *p2)
1893 {
1894 const struct tbl *a = *((const struct tbl * const *)p1);
1895 const struct tbl *b = *((const struct tbl * const *)p2);
1896
1897 return (ascstrcmp(a->name, b->name));
1898 }
1899
1900 struct tbl **
ktsort(struct table * tp)1901 ktsort(struct table *tp)
1902 {
1903 size_t i;
1904 struct tbl **p, **sp, **dp;
1905
1906 /*
1907 * since the table is never entirely full, no need to reserve
1908 * additional space for the trailing NULL appended below
1909 */
1910 i = (size_t)1 << (tp->tshift);
1911 p = alloc2(i, sizeof(struct tbl *), ATEMP);
1912 sp = tp->tbls; /* source */
1913 dp = p; /* dest */
1914 while (i--)
1915 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
1916 ((*dp)->flag & ARRAY)))
1917 dp++;
1918 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp);
1919 p[i] = NULL;
1920 return (p);
1921 }
1922
1923 #ifdef SIGWINCH
1924 static void
x_sigwinch(int sig MKSH_A_UNUSED)1925 x_sigwinch(int sig MKSH_A_UNUSED)
1926 {
1927 /* this runs inside interrupt context, with errno saved */
1928
1929 got_winch = 1;
1930 }
1931 #endif
1932
1933 #ifdef DF
1934 void
DF(const char * fmt,...)1935 DF(const char *fmt, ...)
1936 {
1937 va_list args;
1938 struct timeval tv;
1939 mirtime_mjd mjd;
1940
1941 mksh_lockfd(shl_dbg_fd);
1942 mksh_TIME(tv);
1943 timet2mjd(&mjd, tv.tv_sec);
1944 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ",
1945 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60,
1946 (unsigned)mjd.sec % 60, (unsigned)getpid(),
1947 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
1948 va_start(args, fmt);
1949 shf_vfprintf(shl_dbg, fmt, args);
1950 va_end(args);
1951 shf_putc('\n', shl_dbg);
1952 shf_flush(shl_dbg);
1953 mksh_unlkfd(shl_dbg_fd);
1954 }
1955 #endif
1956
1957 void
x_mkraw(int fd,mksh_ttyst * ocb,bool forread)1958 x_mkraw(int fd, mksh_ttyst *ocb, bool forread)
1959 {
1960 mksh_ttyst cb;
1961
1962 if (ocb)
1963 mksh_tcget(fd, ocb);
1964 else
1965 ocb = &tty_state;
1966
1967 cb = *ocb;
1968 if (forread) {
1969 cb.c_iflag &= ~(ISTRIP);
1970 cb.c_lflag &= ~(ICANON) | ECHO;
1971 } else {
1972 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP);
1973 cb.c_lflag &= ~(ISIG | ICANON | ECHO);
1974 }
1975 #if defined(VLNEXT) && defined(_POSIX_VDISABLE)
1976 /* OSF/1 processes lnext when ~icanon */
1977 cb.c_cc[VLNEXT] = _POSIX_VDISABLE;
1978 #endif
1979 /* SunOS 4.1.x and OSF/1 process discard(flush) when ~icanon */
1980 #if defined(VDISCARD) && defined(_POSIX_VDISABLE)
1981 cb.c_cc[VDISCARD] = _POSIX_VDISABLE;
1982 #endif
1983 cb.c_cc[VTIME] = 0;
1984 cb.c_cc[VMIN] = 1;
1985
1986 mksh_tcset(fd, &cb);
1987 }
1988
1989 #ifdef MKSH_ENVDIR
1990 static void
init_environ(void)1991 init_environ(void)
1992 {
1993 char *xp;
1994 ssize_t n;
1995 XString xs;
1996 struct shf *shf;
1997 DIR *dirp;
1998 struct dirent *dent;
1999
2000 if ((dirp = opendir(MKSH_ENVDIR)) == NULL) {
2001 warningf(false, "cannot read environment from %s: %s",
2002 MKSH_ENVDIR, cstrerror(errno));
2003 return;
2004 }
2005 XinitN(xs, 256, ATEMP);
2006 read_envfile:
2007 errno = 0;
2008 if ((dent = readdir(dirp)) != NULL) {
2009 if (skip_varname(dent->d_name, true)[0] == '\0') {
2010 xp = shf_smprintf(Tf_sSs, MKSH_ENVDIR, dent->d_name);
2011 if (!(shf = shf_open(xp, O_RDONLY, 0, 0))) {
2012 warningf(false,
2013 "cannot read environment %s from %s: %s",
2014 dent->d_name, MKSH_ENVDIR,
2015 cstrerror(errno));
2016 goto read_envfile;
2017 }
2018 afree(xp, ATEMP);
2019 n = strlen(dent->d_name);
2020 xp = Xstring(xs, xp);
2021 XcheckN(xs, xp, n + 32);
2022 memcpy(xp, dent->d_name, n);
2023 xp += n;
2024 *xp++ = '=';
2025 while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) {
2026 xp += n;
2027 if (Xnleft(xs, xp) <= 0)
2028 XcheckN(xs, xp, Xlength(xs, xp));
2029 }
2030 if (n < 0) {
2031 warningf(false,
2032 "cannot read environment %s from %s: %s",
2033 dent->d_name, MKSH_ENVDIR,
2034 cstrerror(shf_errno(shf)));
2035 } else {
2036 *xp = '\0';
2037 xp = Xstring(xs, xp);
2038 rndpush(xp);
2039 typeset(xp, IMPORT | EXPORT, 0, 0, 0);
2040 }
2041 shf_close(shf);
2042 }
2043 goto read_envfile;
2044 } else if (errno)
2045 warningf(false, "cannot read environment from %s: %s",
2046 MKSH_ENVDIR, cstrerror(errno));
2047 closedir(dirp);
2048 Xfree(xs, xp);
2049 }
2050 #else
2051 extern char **environ;
2052
2053 static void
init_environ(void)2054 init_environ(void)
2055 {
2056 const char **wp;
2057
2058 if (environ == NULL)
2059 return;
2060
2061 wp = (const char **)environ;
2062 while (*wp != NULL) {
2063 rndpush(*wp);
2064 typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
2065 ++wp;
2066 }
2067 }
2068 #endif
2069
2070 #ifdef MKSH_EARLY_LOCALE_TRACKING
2071 void
recheck_ctype(void)2072 recheck_ctype(void)
2073 {
2074 const char *ccp;
2075 uint8_t old_utfmode = UTFMODE;
2076
2077 ccp = str_val(global("LC_ALL"));
2078 if (ccp == null)
2079 ccp = str_val(global("LC_CTYPE"));
2080 if (ccp == null)
2081 ccp = str_val(global("LANG"));
2082 UTFMODE = isuc(ccp);
2083 #if HAVE_SETLOCALE_CTYPE
2084 ccp = setlocale(LC_CTYPE, ccp);
2085 #if HAVE_LANGINFO_CODESET
2086 if (!isuc(ccp))
2087 ccp = nl_langinfo(CODESET);
2088 #endif
2089 if (isuc(ccp))
2090 UTFMODE = 1;
2091 #endif
2092
2093 if (Flag(FPOSIX) && UTFMODE && !old_utfmode)
2094 warningf(true, "early locale tracking enabled UTF-8 mode while in POSIX mode, you are now noncompliant");
2095 }
2096 #endif
2097