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, 2020
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 1.372 2020/05/16 22:51:24 tg Exp $");
39
40 #ifndef MKSHRC_PATH
41 #define MKSHRC_PATH "~/.mkshrc"
42 #endif
43
44 #ifndef MKSH_DEFAULT_TMPDIR
45 #define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp"
46 #endif
47
48 static uint8_t isuc(const char *);
49 static int main_init(int, const char *[], Source **, struct block **);
50 void chvt_reinit(void);
51 static void reclaim(void);
52 static void remove_temps(struct temp *);
53 static mksh_uari_t rndsetup(void);
54 static void init_environ(void);
55 #ifdef SIGWINCH
56 static void x_sigwinch(int);
57 #endif
58
59 static const char initsubs[] =
60 "${PS2=> }"
61 "${PS3=#? }"
62 "${PS4=+ }"
63 "${SECONDS=0}"
64 "${TMOUT=0}"
65 "${EPOCHREALTIME=}";
66
67 static const char *initcoms[] = {
68 Ttypeset, Tdr, initvsn, NULL,
69 Ttypeset, Tdx, "HOME", TPATH, TSHELL, NULL,
70 Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL,
71 Talias,
72 "integer=\\\\builtin typeset -i",
73 "local=\\\\builtin typeset",
74 /* not "alias -t --": hash -r needs to work */
75 "hash=\\\\builtin alias -t",
76 "type=\\\\builtin whence -v",
77 "autoload=\\\\builtin typeset -fu",
78 "functions=\\\\builtin typeset -f",
79 "history=\\\\builtin fc -l",
80 "nameref=\\\\builtin typeset -n",
81 "nohup=nohup ",
82 "r=\\\\builtin fc -e -",
83 "login=\\\\builtin exec login",
84 NULL,
85 /* this is what AT&T ksh seems to track, with the addition of emacs */
86 Talias, "-tU",
87 Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
88 "make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL,
89 NULL
90 };
91
92 static const char *restr_com[] = {
93 Ttypeset, Tdr, TPATH, TENV, TSHELL, NULL
94 };
95
96 static bool initio_done;
97
98 /* top-level parsing and execution environment */
99 static struct env env;
100 struct env *e = &env;
101
102 /* compile-time assertions */
103
104 /* this one should be defined by the standard */
105 cta(char_is_1_char, (sizeof(char) == 1) && (sizeof(signed char) == 1) &&
106 (sizeof(unsigned char) == 1));
107 cta(char_is_8_bits, ((CHAR_BIT) == 8) && ((int)(unsigned char)0xFF == 0xFF) &&
108 ((int)(unsigned char)0x100 == 0) && ((int)(unsigned char)(int)-1 == 0xFF));
109 /* the next assertion is probably not really needed */
110 cta(short_is_2_char, sizeof(short) == 2);
111 cta(short_size_no_matter_of_signedness, sizeof(short) == sizeof(unsigned short));
112 /* the next assertion is probably not really needed */
113 cta(int_is_4_char, sizeof(int) == 4);
114 cta(int_size_no_matter_of_signedness, sizeof(int) == sizeof(unsigned int));
115
116 cta(long_ge_int, sizeof(long) >= sizeof(int));
117 cta(long_size_no_matter_of_signedness, sizeof(long) == sizeof(unsigned long));
118
119 #ifndef MKSH_LEGACY_MODE
120 /* the next assertion is probably not really needed */
121 cta(ari_is_4_char, sizeof(mksh_ari_t) == 4);
122 /* but this is */
123 cta(ari_has_31_bit, 0 < (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1));
124 /* the next assertion is probably not really needed */
125 cta(uari_is_4_char, sizeof(mksh_uari_t) == 4);
126 /* but the next three are; we REQUIRE unsigned integer wraparound */
127 cta(uari_has_31_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 2 + 1));
128 cta(uari_has_32_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3));
129 cta(uari_wrap_32_bit,
130 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3) >
131 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 4));
132 #endif
133 /* these are always required */
134 cta(ari_is_signed, (mksh_ari_t)-1 < (mksh_ari_t)0);
135 cta(uari_is_unsigned, (mksh_uari_t)-1 > (mksh_uari_t)0);
136 /* we require these to have the precisely same size and assume 2s complement */
137 cta(ari_size_no_matter_of_signedness, sizeof(mksh_ari_t) == sizeof(mksh_uari_t));
138
139 cta(sizet_size_no_matter_of_signedness, sizeof(ssize_t) == sizeof(size_t));
140 cta(sizet_voidptr_same_size, sizeof(size_t) == sizeof(void *));
141 cta(sizet_funcptr_same_size, sizeof(size_t) == sizeof(void (*)(void)));
142 /* our formatting routines assume this */
143 cta(ptr_fits_in_long, sizeof(size_t) <= sizeof(long));
144 cta(ari_fits_in_long, sizeof(mksh_ari_t) <= sizeof(long));
145
146 static mksh_uari_t
rndsetup(void)147 rndsetup(void)
148 {
149 register uint32_t h;
150 struct {
151 ALLOC_ITEM alloc_INT;
152 void *dataptr, *stkptr, *mallocptr;
153 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
154 sigjmp_buf jbuf;
155 #endif
156 struct timeval tv;
157 } *bufptr;
158 char *cp;
159
160 cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM);
161 /* clear the allocated space, for valgrind and to avoid UB */
162 memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM));
163 /* undo what alloc() did to the malloc result address */
164 bufptr = (void *)(cp - sizeof(ALLOC_ITEM));
165 /* PIE or something similar provides us with deltas here */
166 bufptr->dataptr = &rndsetupstate;
167 /* ASLR in at least Windows, Linux, some BSDs */
168 bufptr->stkptr = &bufptr;
169 /* randomised malloc in BSD (and possibly others) */
170 bufptr->mallocptr = bufptr;
171 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
172 /* glibc pointer guard */
173 sigsetjmp(bufptr->jbuf, 1);
174 #endif
175 /* introduce variation (and yes, second arg MBZ for portability) */
176 mksh_TIME(bufptr->tv);
177
178 #ifdef MKSH_ALLOC_CATCH_UNDERRUNS
179 mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE);
180 #endif
181 h = chvt_rndsetup(bufptr, sizeof(*bufptr));
182
183 afree(cp, APERM);
184 return ((mksh_uari_t)h);
185 }
186
187 void
chvt_reinit(void)188 chvt_reinit(void)
189 {
190 kshpid = procpid = getpid();
191 ksheuid = geteuid();
192 kshpgrp = getpgrp();
193 kshppid = getppid();
194 }
195
196 static const char *empty_argv[] = {
197 Tmksh, NULL
198 };
199
200 static uint8_t
isuc(const char * cx)201 isuc(const char *cx) {
202 char *cp, *x;
203 uint8_t rv = 0;
204
205 if (!cx || !*cx)
206 return (0);
207
208 /* uppercase a string duplicate */
209 strdupx(x, cx, ATEMP);
210 cp = x;
211 while ((*cp = ksh_toupper(*cp)))
212 ++cp;
213
214 /* check for UTF-8 */
215 if (strstr(x, "UTF-8") || strstr(x, "UTF8"))
216 rv = 1;
217
218 /* free copy and out */
219 afree(x, ATEMP);
220 return (rv);
221 }
222
223 static int
main_init(int argc,const char * argv[],Source ** sp,struct block ** lp)224 main_init(int argc, const char *argv[], Source **sp, struct block **lp)
225 {
226 int argi, i;
227 Source *s = NULL;
228 struct block *l;
229 unsigned char restricted_shell = 0, errexit, utf_flag;
230 char *cp;
231 const char *ccp, **wp;
232 struct tbl *vp;
233 struct stat s_stdin;
234 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
235 ssize_t k;
236 #endif
237
238 #if defined(MKSH_EBCDIC) || defined(MKSH_FAUX_EBCDIC)
239 ebcdic_init();
240 #endif
241 set_ifs(TC_IFSWS);
242
243 #ifdef __OS2__
244 os2_init(&argc, &argv);
245 #define builtin_name_cmp stricmp
246 #else
247 #define builtin_name_cmp strcmp
248 #endif
249
250 /* do things like getpgrp() et al. */
251 chvt_reinit();
252
253 /* make sure argv[] is sane, for weird OSes */
254 if (!*argv) {
255 argv = empty_argv;
256 argc = 1;
257 }
258 kshname = argv[0];
259
260 /* initialise permanent Area */
261 ainit(&aperm);
262 /* max. name length: -2147483648 = 11 (+ NUL) */
263 vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM);
264
265 /* set up base environment */
266 env.type = E_NONE;
267 ainit(&env.area);
268 /* set up global l->vars and l->funs */
269 newblock();
270
271 /* Do this first so output routines (eg, errorf, shellf) can work */
272 initio();
273
274 /* determine the basename (without '-' or path) of the executable */
275 ccp = kshname;
276 goto begin_parsing_kshname;
277 while ((i = ccp[argi++])) {
278 if (mksh_cdirsep(i)) {
279 ccp += argi;
280 begin_parsing_kshname:
281 argi = 0;
282 }
283 }
284 Flag(FLOGIN) = (ord(*ccp) == ORD('-')) || (ord(*kshname) == ORD('-'));
285 if (ord(*ccp) == ORD('-'))
286 ++ccp;
287 if (!*ccp)
288 ccp = empty_argv[0];
289
290 /*
291 * Turn on nohup by default. (AT&T ksh does not have a nohup
292 * option - it always sends the hup).
293 */
294 Flag(FNOHUP) = 1;
295
296 /*
297 * Turn on brace expansion by default. AT&T kshs that have
298 * alternation always have it on.
299 */
300 Flag(FBRACEEXPAND) = 1;
301
302 /*
303 * Turn on "set -x" inheritance by default.
304 */
305 Flag(FXTRACEREC) = 1;
306
307 /* define built-in commands and see if we were called as one */
308 ktinit(APERM, &builtins,
309 /* currently up to 52 builtins: 75% of 128 = 2^7 */
310 7);
311 for (i = 0; mkshbuiltins[i].name != NULL; ++i) {
312 const char *builtin_name;
313
314 builtin_name = builtin(mkshbuiltins[i].name,
315 mkshbuiltins[i].func);
316 if (!builtin_name_cmp(ccp, builtin_name)) {
317 /* canonicalise argv[0] */
318 ccp = builtin_name;
319 as_builtin = true;
320 }
321 }
322
323 if (!as_builtin) {
324 /* check for -T option early */
325 argi = parse_args(argv, OF_FIRSTTIME, NULL);
326 if (argi < 0)
327 return (1);
328 /* called as rsh, rmksh, -rsh, RKSH.EXE, etc.? */
329 if (ksh_eq(*ccp, 'R', 'r')) {
330 ++ccp;
331 ++restricted_shell;
332 }
333 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
334 /* are we called as -rsh or /bin/sh or SH.EXE or so? */
335 if (ksh_eq(ccp[0], 'S', 's') &&
336 ksh_eq(ccp[1], 'H', 'h')) {
337 /* either also turns off braceexpand */
338 #ifdef MKSH_BINSHPOSIX
339 /* enable better POSIX conformance */
340 change_flag(FPOSIX, OF_FIRSTTIME, true);
341 #endif
342 #ifdef MKSH_BINSHREDUCED
343 /* enable kludge/compat mode */
344 change_flag(FSH, OF_FIRSTTIME, true);
345 #endif
346 }
347 #endif
348 }
349
350 initvar();
351
352 inittraps();
353
354 coproc_init();
355
356 /* set up variable and command dictionaries */
357 ktinit(APERM, &taliases, 0);
358 ktinit(APERM, &aliases, 0);
359 #ifndef MKSH_NOPWNAM
360 ktinit(APERM, &homedirs, 0);
361 #endif
362
363 /* define shell keywords */
364 initkeywords();
365
366 init_histvec();
367
368 /* initialise tty size before importing environment */
369 change_winsz();
370
371 #ifdef _PATH_DEFPATH
372 def_path = _PATH_DEFPATH;
373 #else
374 #ifdef _CS_PATH
375 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
376 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
377 def_path = cp;
378 else
379 #endif
380 /*
381 * this is uniform across all OSes unless it
382 * breaks somewhere hard; don't try to optimise,
383 * e.g. add stuff for Interix or remove /usr
384 * for HURD, because e.g. Debian GNU/HURD is
385 * "keeping a regular /usr"; this is supposed
386 * to be a sane 'basic' default PATH
387 */
388 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
389 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
390 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
391 MKSH_UNIXROOT "/usr/sbin";
392 #endif
393
394 /*
395 * Set PATH to def_path (will set the path global variable).
396 * (import of environment below will probably change this setting).
397 */
398 vp = global(TPATH);
399 /* setstr can't fail here */
400 setstr(vp, def_path, KSH_RETURN_ERROR);
401
402 #ifndef MKSH_NO_CMDLINE_EDITING
403 /*
404 * Set edit mode to emacs by default, may be overridden
405 * by the environment or the user. Also, we want tab completion
406 * on in vi by default.
407 */
408 change_flag(FEMACS, OF_SPECIAL, true);
409 #if !MKSH_S_NOVI
410 Flag(FVITABCOMPLETE) = 1;
411 #endif
412 #endif
413
414 /* import environment */
415 init_environ();
416
417 /* override default PATH regardless of environment */
418 #ifdef MKSH_DEFPATH_OVERRIDE
419 vp = global(TPATH);
420 setstr(vp, MKSH_DEFPATH_OVERRIDE, KSH_RETURN_ERROR);
421 #endif
422
423 /* for security */
424 typeset(TinitIFS, 0, 0, 0, 0);
425
426 /* assign default shell variable values */
427 typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0);
428 substitute(initsubs, 0);
429
430 /* Figure out the current working directory and set $PWD */
431 vp = global(TPWD);
432 cp = str_val(vp);
433 /* Try to use existing $PWD if it is valid */
434 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
435 Tdot, true)) ? cp : NULL);
436 if (current_wd[0])
437 simplify_path(current_wd);
438 /* Only set pwd if we know where we are or if it had a bogus value */
439 if (current_wd[0] || *cp)
440 /* setstr can't fail here */
441 setstr(vp, current_wd, KSH_RETURN_ERROR);
442
443 for (wp = initcoms; *wp != NULL; wp++) {
444 c_builtin(wp);
445 while (*wp != NULL)
446 wp++;
447 }
448 setint_n(global("OPTIND"), 1, 10);
449
450 kshuid = getuid();
451 kshgid = getgid();
452 kshegid = getegid();
453
454 safe_prompt = ksheuid ? "$ " : "# ";
455 vp = global("PS1");
456 /* Set PS1 if unset or we are root and prompt doesn't contain a # */
457 if (!(vp->flag & ISSET) ||
458 (!ksheuid && !strchr(str_val(vp), '#')))
459 /* setstr can't fail here */
460 setstr(vp, safe_prompt, KSH_RETURN_ERROR);
461 setint_n((vp = global("BASHPID")), 0, 10);
462 vp->flag |= INT_U;
463 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
464 vp->flag |= INT_U;
465 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
466 vp->flag |= INT_U;
467 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
468 vp->flag |= INT_U;
469 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
470 vp->flag |= INT_U;
471 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
472 vp->flag |= INT_U;
473 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
474 vp->flag |= INT_U;
475 setint_n((vp = global("RANDOM")), rndsetup(), 10);
476 vp->flag |= INT_U;
477 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
478
479 /* Set this before parsing arguments */
480 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
481
482 /* record if monitor is set on command line (see j_init() in jobs.c) */
483 #ifndef MKSH_UNEMPLOYED
484 Flag(FMONITOR) = 127;
485 #endif
486 /* this to note if utf-8 mode is set on command line (see below) */
487 UTFMODE = 2;
488
489 if (!as_builtin) {
490 argi = parse_args(argv, OF_CMDLINE, NULL);
491 if (argi < 0)
492 return (1);
493 }
494
495 /* process this later only, default to off (hysterical raisins) */
496 utf_flag = UTFMODE;
497 UTFMODE = 0;
498
499 if (as_builtin) {
500 /* auto-detect from environment variables, always */
501 utf_flag = 3;
502 } else if (Flag(FCOMMAND)) {
503 s = pushs(SSTRINGCMDLINE, ATEMP);
504 if (!(s->start = s->str = argv[argi++]))
505 errorf(Tf_optfoo, "", "", 'c', Treq_arg);
506 while (*s->str) {
507 if (ctype(*s->str, C_QUOTE))
508 break;
509 s->str++;
510 }
511 if (!*s->str)
512 s->flags |= SF_MAYEXEC;
513 s->str = s->start;
514 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
515 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
516 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
517 ++argi;
518 #endif
519 if (argv[argi])
520 kshname = argv[argi++];
521 } else if (argi < argc && !Flag(FSTDIN)) {
522 s = pushs(SFILE, ATEMP);
523 #ifdef __OS2__
524 /*
525 * A bug in OS/2 extproc (like shebang) handling makes
526 * it not pass the full pathname of a script, so we need
527 * to search for it. This changes the behaviour of a
528 * simple "mksh foo", but can't be helped.
529 */
530 s->file = argv[argi++];
531 if (search_access(s->file, X_OK) != 0)
532 s->file = search_path(s->file, path, X_OK, NULL);
533 if (!s->file || !*s->file)
534 s->file = argv[argi - 1];
535 #else
536 s->file = argv[argi++];
537 #endif
538 s->u.shf = shf_open(s->file, O_RDONLY | O_MAYEXEC, 0,
539 SHF_MAPHI | SHF_CLEXEC);
540 if (s->u.shf == NULL) {
541 shl_stdout_ok = false;
542 warningf(true, Tf_sD_s, s->file, cstrerror(errno));
543 /* mandated by SUSv4 */
544 exstat = 127;
545 unwind(LERROR);
546 }
547 kshname = s->file;
548 } else {
549 Flag(FSTDIN) = 1;
550 s = pushs(SSTDIN, ATEMP);
551 s->file = "<stdin>";
552 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
553 NULL);
554 if (isatty(0) && isatty(2)) {
555 Flag(FTALKING) = Flag(FTALKING_I) = 1;
556 /* The following only if isatty(0) */
557 s->flags |= SF_TTY;
558 s->u.shf->flags |= SHF_INTERRUPT;
559 s->file = NULL;
560 }
561 }
562
563 /* this bizarreness is mandated by POSIX */
564 if (Flag(FTALKING) && fstat(0, &s_stdin) >= 0 &&
565 S_ISCHR(s_stdin.st_mode))
566 reset_nonblock(0);
567
568 /* initialise job control */
569 j_init();
570 /* do this after j_init() which calls tty_init_state() */
571 if (Flag(FTALKING)) {
572 if (utf_flag == 2) {
573 #ifndef MKSH_ASSUME_UTF8
574 /* auto-detect from locale or environment */
575 utf_flag = 4;
576 #else /* this may not be an #elif */
577 #if MKSH_ASSUME_UTF8
578 utf_flag = 1;
579 #else
580 /* always disable UTF-8 (for interactive) */
581 utf_flag = 0;
582 #endif
583 #endif
584 }
585 #ifndef MKSH_NO_CMDLINE_EDITING
586 x_init();
587 #endif
588 }
589
590 #ifdef SIGWINCH
591 sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
592 setsig(&sigtraps[SIGWINCH], x_sigwinch,
593 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
594 #endif
595
596 l = e->loc;
597 if (as_builtin) {
598 l->argc = argc;
599 l->argv = argv;
600 l->argv[0] = ccp;
601 } else {
602 l->argc = argc - argi;
603 /*
604 * allocate a new array because otherwise, when we modify
605 * it in-place, ps(1) output changes; the meaning of argc
606 * here is slightly different as it excludes kshname, and
607 * we add a trailing NULL sentinel as well
608 */
609 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
610 l->argv[0] = kshname;
611 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
612 l->argv[l->argc + 1] = NULL;
613 getopts_reset(1);
614 }
615
616 /* divine the initial state of the utf8-mode Flag */
617 ccp = null;
618 switch (utf_flag) {
619
620 /* auto-detect from locale or environment */
621 case 4:
622 #if HAVE_SETLOCALE_CTYPE
623 ccp = setlocale(LC_CTYPE, "");
624 #if HAVE_LANGINFO_CODESET
625 if (!isuc(ccp))
626 ccp = nl_langinfo(CODESET);
627 #endif
628 if (!isuc(ccp))
629 ccp = null;
630 #endif
631 /* FALLTHROUGH */
632
633 /* auto-detect from environment */
634 case 3:
635 /* these were imported from environ earlier */
636 if (ccp == null)
637 ccp = str_val(global("LC_ALL"));
638 if (ccp == null)
639 ccp = str_val(global("LC_CTYPE"));
640 if (ccp == null)
641 ccp = str_val(global("LANG"));
642 UTFMODE = isuc(ccp);
643 break;
644
645 /* not set on command line, not FTALKING */
646 case 2:
647 /* unknown values */
648 default:
649 utf_flag = 0;
650 /* FALLTHROUGH */
651
652 /* known values */
653 case 1:
654 case 0:
655 UTFMODE = utf_flag;
656 break;
657 }
658
659 /* Disable during .profile/ENV reading */
660 restricted_shell |= Flag(FRESTRICTED);
661 Flag(FRESTRICTED) = 0;
662 errexit = Flag(FERREXIT);
663 Flag(FERREXIT) = 0;
664
665 /* save flags for "set +o" handling */
666 memcpy(baseline_flags, shell_flags, sizeof(shell_flags));
667 /* disable these because they have special handling */
668 baseline_flags[(int)FPOSIX] = 0;
669 baseline_flags[(int)FSH] = 0;
670 /* ensure these always show up setting, for FPOSIX/FSH */
671 baseline_flags[(int)FBRACEEXPAND] = 0;
672 baseline_flags[(int)FUNNYCODE] = 0;
673 #if !defined(MKSH_SMALL) || defined(DEBUG)
674 /* mark as initialised */
675 baseline_flags[(int)FNFLAGS] = 1;
676 #endif
677 if (as_builtin)
678 goto skip_startup_files;
679
680 /*
681 * Do this before profile/$ENV so that if it causes problems in them,
682 * user will know why things broke.
683 */
684 if (!current_wd[0] && Flag(FTALKING))
685 warningf(false, "can't determine current directory");
686
687 if (Flag(FLOGIN))
688 include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
689 if (Flag(FPRIVILEGED)) {
690 include(MKSH_SUID_PROFILE, 0, NULL, true);
691 /* note whether -p was enabled during startup */
692 if (Flag(FPRIVILEGED) == 1)
693 /* allow set -p to setuid() later */
694 Flag(FPRIVILEGED) = 3;
695 else
696 /* turn off -p if not set explicitly */
697 change_flag(FPRIVILEGED, OF_INTERNAL, false);
698 /* track shell-imposed changes */
699 baseline_flags[(int)FPRIVILEGED] = Flag(FPRIVILEGED);
700 } else {
701 if (Flag(FLOGIN))
702 include(substitute("$HOME/.profile", 0), 0, NULL, true);
703 if (Flag(FTALKING)) {
704 cp = substitute("${ENV:-" MKSHRC_PATH "}", DOTILDE);
705 if (cp[0] != '\0')
706 include(cp, 0, NULL, true);
707 }
708 }
709 if (restricted_shell) {
710 c_builtin(restr_com);
711 /* After typeset command... */
712 Flag(FRESTRICTED) = 1;
713 /* track shell-imposed changes */
714 baseline_flags[(int)FRESTRICTED] = 1;
715 }
716 Flag(FERREXIT) = errexit;
717
718 if (Flag(FTALKING) && s)
719 hist_init(s);
720 else {
721 /* set after ENV */
722 skip_startup_files:
723 Flag(FTRACKALL) = 1;
724 /* track shell-imposed change (might lower surprise) */
725 baseline_flags[(int)FTRACKALL] = 1;
726 }
727
728 alarm_init();
729
730 *sp = s;
731 *lp = l;
732 return (0);
733 }
734
735 /* this indirection barrier reduces stack usage during normal operation */
736
737 int
main(int argc,const char * argv[])738 main(int argc, const char *argv[])
739 {
740 int rv;
741 Source *s;
742 struct block *l;
743
744 if ((rv = main_init(argc, argv, &s, &l)) == 0) {
745 if (as_builtin) {
746 rv = c_builtin(l->argv);
747 } else {
748 shell(s, 0);
749 /* NOTREACHED */
750 }
751 }
752 return (rv);
753 }
754
755 int
include(const char * name,int argc,const char ** argv,bool intr_ok)756 include(const char *name, int argc, const char **argv, bool intr_ok)
757 {
758 Source *volatile s = NULL;
759 struct shf *shf;
760 const char **volatile old_argv;
761 volatile int old_argc;
762 int i;
763
764 shf = shf_open(name, O_RDONLY | O_MAYEXEC, 0, SHF_MAPHI | SHF_CLEXEC);
765 if (shf == NULL)
766 return (-1);
767
768 if (argv) {
769 old_argv = e->loc->argv;
770 old_argc = e->loc->argc;
771 } else {
772 old_argv = NULL;
773 old_argc = 0;
774 }
775 newenv(E_INCL);
776 if ((i = kshsetjmp(e->jbuf))) {
777 quitenv(s ? s->u.shf : NULL);
778 if (old_argv) {
779 e->loc->argv = old_argv;
780 e->loc->argc = old_argc;
781 }
782 switch (i) {
783 case LRETURN:
784 case LERROR:
785 case LERREXT:
786 /* see below */
787 return (exstat & 0xFF);
788 case LINTR:
789 /*
790 * intr_ok is set if we are including .profile or $ENV.
791 * If user ^Cs out, we don't want to kill the shell...
792 */
793 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
794 return (1);
795 /* FALLTHROUGH */
796 case LEXIT:
797 case LLEAVE:
798 case LSHELL:
799 unwind(i);
800 /* NOTREACHED */
801 default:
802 internal_errorf(Tunexpected_type, Tunwind, Tsource, i);
803 /* NOTREACHED */
804 }
805 }
806 if (argv) {
807 e->loc->argv = argv;
808 e->loc->argc = argc;
809 }
810 s = pushs(SFILE, ATEMP);
811 s->u.shf = shf;
812 strdupx(s->file, name, ATEMP);
813 i = shell(s, 1);
814 quitenv(s->u.shf);
815 if (old_argv) {
816 e->loc->argv = old_argv;
817 e->loc->argc = old_argc;
818 }
819 /* & 0xff to ensure value not -1 */
820 return (i & 0xFF);
821 }
822
823 /* spawn a command into a shell optionally keeping track of the line number */
824 int
command(const char * comm,int line)825 command(const char *comm, int line)
826 {
827 Source *s, *sold = source;
828 int rv;
829
830 s = pushs(SSTRING, ATEMP);
831 s->start = s->str = comm;
832 s->line = line;
833 rv = shell(s, 1);
834 source = sold;
835 return (rv);
836 }
837
838 /*
839 * run the commands from the input source, returning status.
840 */
841 int
shell(Source * volatile s,volatile int level)842 shell(Source * volatile s, volatile int level)
843 {
844 struct op *t;
845 volatile bool wastty = tobool(s->flags & SF_TTY);
846 volatile uint8_t attempts = 13;
847 volatile bool interactive = (level == 0) && Flag(FTALKING);
848 volatile bool sfirst = true;
849 Source *volatile old_source = source;
850 int i;
851
852 newenv(level == 2 ? E_EVAL : E_PARSE);
853 if (level == 2)
854 e->flags |= EF_IN_EVAL;
855 if (interactive)
856 really_exit = false;
857 switch ((i = kshsetjmp(e->jbuf))) {
858 case 0:
859 break;
860 case LBREAK:
861 case LCONTIN:
862 /* assert: interactive == false */
863 source = old_source;
864 quitenv(NULL);
865 if (level == 2) {
866 /* keep on going */
867 unwind(i);
868 /* NOTREACHED */
869 }
870 internal_errorf(Tf_cant_s, Tshell,
871 i == LBREAK ? Tbreak : Tcontinue);
872 /* NOTREACHED */
873 case LINTR:
874 /* we get here if SIGINT not caught or ignored */
875 case LERROR:
876 case LERREXT:
877 case LSHELL:
878 if (interactive) {
879 if (i == LINTR)
880 shellf("\n");
881 /*
882 * Reset any eof that was read as part of a
883 * multiline command.
884 */
885 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
886 s->type = SSTDIN;
887 /*
888 * Used by exit command to get back to
889 * top level shell. Kind of strange since
890 * interactive is set if we are reading from
891 * a tty, but to have stopped jobs, one only
892 * needs FMONITOR set (not FTALKING/SF_TTY)...
893 */
894 /* toss any input we have so far */
895 yyrecursive_pop(true);
896 s->start = s->str = null;
897 retrace_info = NULL;
898 herep = heres;
899 break;
900 }
901 /* FALLTHROUGH */
902 case LEXIT:
903 case LLEAVE:
904 case LRETURN:
905 source = old_source;
906 quitenv(NULL);
907 if (i == LERREXT && level == 2)
908 return (exstat & 0xFF);
909 /* keep on going */
910 unwind(i);
911 /* NOTREACHED */
912 default:
913 source = old_source;
914 quitenv(NULL);
915 internal_errorf(Tunexpected_type, Tunwind, Tshell, i);
916 /* NOTREACHED */
917 }
918 while (/* CONSTCOND */ 1) {
919 if (trap)
920 runtraps(0);
921
922 if (s->next == NULL) {
923 if (Flag(FVERBOSE))
924 s->flags |= SF_ECHO;
925 else
926 s->flags &= ~SF_ECHO;
927 }
928 if (interactive) {
929 j_notify();
930 set_prompt(PS1, s);
931 }
932 t = compile(s, sfirst, true);
933 if (interactive)
934 histsave(&s->line, NULL, HIST_FLUSH, true);
935 sfirst = false;
936 if (!t)
937 goto source_no_tree;
938 if (t->type == TEOF) {
939 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
940 shellf("Use 'exit' to leave mksh\n");
941 s->type = SSTDIN;
942 } else if (wastty && !really_exit &&
943 j_stopped_running()) {
944 really_exit = true;
945 s->type = SSTDIN;
946 } else {
947 /*
948 * this for POSIX which says EXIT traps
949 * shall be taken in the environment
950 * immediately after the last command
951 * executed.
952 */
953 if (level == 0)
954 unwind(LEXIT);
955 break;
956 }
957 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM)
958 t->u.evalflags |= DOTCOMEXEC;
959 if (!Flag(FNOEXEC) || (s->flags & SF_TTY))
960 exstat = execute(t, 0, NULL) & 0xFF;
961
962 if (t->type != TEOF && interactive && really_exit)
963 really_exit = false;
964
965 source_no_tree:
966 reclaim();
967 }
968 source = old_source;
969 quitenv(NULL);
970 return (exstat & 0xFF);
971 }
972
973 /* return to closest error handler or shell(), exit if none found */
974 /* note: i MUST NOT be 0 */
975 void
unwind(int i)976 unwind(int i)
977 {
978 /* during eval, skip FERREXIT trap */
979 if (i == LERREXT && (e->flags & EF_IN_EVAL))
980 goto defer_traps;
981
982 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
983 if (i == LEXIT || ((i == LERROR || i == LERREXT || i == LINTR) &&
984 sigtraps[ksh_SIGEXIT].trap &&
985 (!Flag(FTALKING) || Flag(FERREXIT)))) {
986 ++trap_nested;
987 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
988 --trap_nested;
989 i = LLEAVE;
990 } else if (Flag(FERREXIT) && (i == LERROR || i == LERREXT || i == LINTR)) {
991 ++trap_nested;
992 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
993 --trap_nested;
994 i = LLEAVE;
995 }
996 defer_traps:
997
998 while (/* CONSTCOND */ 1) {
999 switch (e->type) {
1000 case E_PARSE:
1001 case E_FUNC:
1002 case E_INCL:
1003 case E_LOOP:
1004 case E_ERRH:
1005 case E_EVAL:
1006 kshlongjmp(e->jbuf, i);
1007 /* NOTREACHED */
1008 case E_NONE:
1009 if (i == LINTR)
1010 e->flags |= EF_FAKE_SIGDIE;
1011 /* FALLTHROUGH */
1012 default:
1013 quitenv(NULL);
1014 }
1015 }
1016 }
1017
1018 void
newenv(int type)1019 newenv(int type)
1020 {
1021 struct env *ep;
1022 char *cp;
1023
1024 /*
1025 * struct env includes ALLOC_ITEM for alignment constraints
1026 * so first get the actually used memory, then assign it
1027 */
1028 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP);
1029 /* undo what alloc() did to the malloc result address */
1030 ep = (void *)(cp - sizeof(ALLOC_ITEM));
1031 /* initialise public members of struct env (not the ALLOC_ITEM) */
1032 ainit(&ep->area);
1033 ep->oenv = e;
1034 ep->loc = e->loc;
1035 ep->savefd = NULL;
1036 ep->temps = NULL;
1037 ep->yyrecursive_statep = NULL;
1038 ep->type = type;
1039 ep->flags = e->flags & EF_IN_EVAL;
1040 e = ep;
1041 }
1042
1043 void
quitenv(struct shf * shf)1044 quitenv(struct shf *shf)
1045 {
1046 struct env *ep = e;
1047 char *cp;
1048 int fd;
1049
1050 yyrecursive_pop(true);
1051 while (ep->oenv && ep->oenv->loc != ep->loc)
1052 popblock();
1053 if (ep->savefd != NULL) {
1054 for (fd = 0; fd < NUFILE; fd++)
1055 /* if ep->savefd[fd] < 0, means fd was closed */
1056 if (ep->savefd[fd])
1057 restfd(fd, ep->savefd[fd]);
1058 if (ep->savefd[2])
1059 /* Clear any write errors */
1060 shf_reopen(2, SHF_WR, shl_out);
1061 }
1062 /*
1063 * Bottom of the stack.
1064 * Either main shell is exiting or cleanup_parents_env() was called.
1065 */
1066 if (ep->oenv == NULL) {
1067 #ifdef DEBUG_LEAKS
1068 int i;
1069 #endif
1070
1071 if (ep->type == E_NONE) {
1072 /* Main shell exiting? */
1073 #if HAVE_PERSISTENT_HISTORY
1074 if (Flag(FTALKING))
1075 hist_finish();
1076 #endif
1077 j_exit();
1078 if (ep->flags & EF_FAKE_SIGDIE) {
1079 int sig = (exstat & 0xFF) - 128;
1080
1081 /*
1082 * ham up our death a bit (AT&T ksh
1083 * only seems to do this for SIGTERM)
1084 * Don't do it for SIGQUIT, since we'd
1085 * dump a core..
1086 */
1087 if ((sig == SIGINT || sig == SIGTERM) &&
1088 (kshpgrp == kshpid)) {
1089 setsig(&sigtraps[sig], SIG_DFL,
1090 SS_RESTORE_CURR | SS_FORCE);
1091 kill(0, sig);
1092 }
1093 }
1094 }
1095 if (shf)
1096 shf_close(shf);
1097 reclaim();
1098 #ifdef DEBUG_LEAKS
1099 #ifndef MKSH_NO_CMDLINE_EDITING
1100 x_done();
1101 #endif
1102 #ifndef MKSH_NOPROSPECTOFWORK
1103 /* block at least SIGCHLD during/after afreeall */
1104 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
1105 #endif
1106 afreeall(APERM);
1107 for (fd = 3; fd < NUFILE; fd++)
1108 if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
1109 (i & FD_CLOEXEC))
1110 close(fd);
1111 close(2);
1112 close(1);
1113 close(0);
1114 #endif
1115 exit(exstat & 0xFF);
1116 }
1117 if (shf)
1118 shf_close(shf);
1119 reclaim();
1120
1121 e = e->oenv;
1122
1123 /* free the struct env - tricky due to the ALLOC_ITEM inside */
1124 cp = (void *)ep;
1125 afree(cp + sizeof(ALLOC_ITEM), ATEMP);
1126 }
1127
1128 /* Called after a fork to cleanup stuff left over from parents environment */
1129 void
cleanup_parents_env(void)1130 cleanup_parents_env(void)
1131 {
1132 struct env *ep;
1133 int fd;
1134
1135 /*
1136 * Don't clean up temporary files - parent will probably need them.
1137 * Also, can't easily reclaim memory since variables, etc. could be
1138 * anywhere.
1139 */
1140
1141 /* close all file descriptors hiding in savefd */
1142 for (ep = e; ep; ep = ep->oenv) {
1143 if (ep->savefd) {
1144 for (fd = 0; fd < NUFILE; fd++)
1145 if (ep->savefd[fd] > 0)
1146 close(ep->savefd[fd]);
1147 afree(ep->savefd, &ep->area);
1148 ep->savefd = NULL;
1149 }
1150 #ifdef DEBUG_LEAKS
1151 if (ep->type != E_NONE)
1152 ep->type = E_GONE;
1153 #endif
1154 }
1155 #ifndef DEBUG_LEAKS
1156 e->oenv = NULL;
1157 #endif
1158 }
1159
1160 /* Called just before an execve cleanup stuff temporary files */
1161 void
cleanup_proc_env(void)1162 cleanup_proc_env(void)
1163 {
1164 struct env *ep;
1165
1166 for (ep = e; ep; ep = ep->oenv)
1167 remove_temps(ep->temps);
1168 }
1169
1170 /* remove temp files and free ATEMP Area */
1171 static void
reclaim(void)1172 reclaim(void)
1173 {
1174 struct block *l;
1175
1176 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) {
1177 e->loc = l->next;
1178 afreeall(&l->area);
1179 }
1180
1181 remove_temps(e->temps);
1182 e->temps = NULL;
1183
1184 /*
1185 * if the memory backing source is reclaimed, things
1186 * will end up badly when a function expecting it to
1187 * be valid is run; a NULL pointer is easily debugged
1188 */
1189 if (source && source->areap == &e->area)
1190 source = NULL;
1191 afreeall(&e->area);
1192 }
1193
1194 static void
remove_temps(struct temp * tp)1195 remove_temps(struct temp *tp)
1196 {
1197 while (tp) {
1198 if (tp->pid == procpid)
1199 unlink(tp->tffn);
1200 tp = tp->next;
1201 }
1202 }
1203
1204 /*
1205 * Initialise tty_fd. Used for tracking the size of the terminal,
1206 * saving/resetting tty modes upon forground job completion, and
1207 * for setting up the tty process group. Return values:
1208 * 0 = got controlling tty
1209 * 1 = got terminal but no controlling tty
1210 * 2 = cannot find a terminal
1211 * 3 = cannot dup fd
1212 * 4 = cannot make fd close-on-exec
1213 * An existing tty_fd is cached if no "better" one could be found,
1214 * i.e. if tty_devtty was already set or the new would not set it.
1215 */
1216 int
tty_init_fd(void)1217 tty_init_fd(void)
1218 {
1219 int fd, rv, eno = 0;
1220 bool do_close = false, is_devtty = true;
1221
1222 if (tty_devtty) {
1223 /* already got a tty which is /dev/tty */
1224 return (0);
1225 }
1226
1227 #ifdef _UWIN
1228 /*XXX imake style */
1229 if (isatty(3)) {
1230 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */
1231 fd = 3;
1232 goto got_fd;
1233 }
1234 #endif
1235 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) {
1236 do_close = true;
1237 goto got_fd;
1238 }
1239 eno = errno;
1240
1241 if (tty_fd >= 0) {
1242 /* already got a non-devtty one */
1243 rv = 1;
1244 goto out;
1245 }
1246 is_devtty = false;
1247
1248 if (isatty((fd = 0)) || isatty((fd = 2)))
1249 goto got_fd;
1250 /* cannot find one */
1251 rv = 2;
1252 /* assert: do_close == false */
1253 goto out;
1254
1255 got_fd:
1256 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) {
1257 eno = errno;
1258 rv = 3;
1259 goto out;
1260 }
1261 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) {
1262 eno = errno;
1263 close(rv);
1264 rv = 4;
1265 goto out;
1266 }
1267 tty_fd = rv;
1268 tty_devtty = is_devtty;
1269 rv = eno = 0;
1270 out:
1271 if (do_close)
1272 close(fd);
1273 errno = eno;
1274 return (rv);
1275 }
1276
1277 /* A shell error occurred (eg, syntax error, etc.) */
1278
1279 #define VWARNINGF_ERRORPREFIX 1
1280 #define VWARNINGF_FILELINE 2
1281 #define VWARNINGF_BUILTIN 4
1282 #define VWARNINGF_INTERNAL 8
1283
1284 static void vwarningf(unsigned int, const char *, va_list)
1285 MKSH_A_FORMAT(__printf__, 2, 0);
1286
1287 static void
vwarningf(unsigned int flags,const char * fmt,va_list ap)1288 vwarningf(unsigned int flags, const char *fmt, va_list ap)
1289 {
1290 if (fmt) {
1291 if (flags & VWARNINGF_INTERNAL)
1292 shf_fprintf(shl_out, Tf_sD_, "internal error");
1293 if (flags & VWARNINGF_ERRORPREFIX)
1294 error_prefix(tobool(flags & VWARNINGF_FILELINE));
1295 if ((flags & VWARNINGF_BUILTIN) &&
1296 /* not set when main() calls parse_args() */
1297 builtin_argv0 && builtin_argv0 != kshname)
1298 shf_fprintf(shl_out, Tf_sD_, builtin_argv0);
1299 shf_vfprintf(shl_out, fmt, ap);
1300 shf_putchar('\n', shl_out);
1301 }
1302 shf_flush(shl_out);
1303 }
1304
1305 void
errorfx(int rc,const char * fmt,...)1306 errorfx(int rc, const char *fmt, ...)
1307 {
1308 va_list va;
1309
1310 exstat = rc;
1311
1312 /* debugging: note that stdout not valid */
1313 shl_stdout_ok = false;
1314
1315 va_start(va, fmt);
1316 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1317 va_end(va);
1318 unwind(LERROR);
1319 }
1320
1321 void
errorf(const char * fmt,...)1322 errorf(const char *fmt, ...)
1323 {
1324 va_list va;
1325
1326 exstat = 1;
1327
1328 /* debugging: note that stdout not valid */
1329 shl_stdout_ok = false;
1330
1331 va_start(va, fmt);
1332 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1333 va_end(va);
1334 unwind(LERROR);
1335 }
1336
1337 /* like errorf(), but no unwind is done */
1338 void
warningf(bool fileline,const char * fmt,...)1339 warningf(bool fileline, const char *fmt, ...)
1340 {
1341 va_list va;
1342
1343 va_start(va, fmt);
1344 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0),
1345 fmt, va);
1346 va_end(va);
1347 }
1348
1349 /*
1350 * Used by built-in utilities to prefix shell and utility name to message
1351 * (also unwinds environments for special builtins).
1352 */
1353 void
bi_errorf(const char * fmt,...)1354 bi_errorf(const char *fmt, ...)
1355 {
1356 va_list va;
1357
1358 /* debugging: note that stdout not valid */
1359 shl_stdout_ok = false;
1360
1361 exstat = 1;
1362
1363 va_start(va, fmt);
1364 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1365 VWARNINGF_BUILTIN, fmt, va);
1366 va_end(va);
1367
1368 /* POSIX special builtins cause non-interactive shells to exit */
1369 if (builtin_spec) {
1370 builtin_argv0 = NULL;
1371 /* may not want to use LERROR here */
1372 unwind(LERROR);
1373 }
1374 }
1375
1376 /*
1377 * Used by functions called by builtins and not:
1378 * identical to errorfx if first argument is nil,
1379 * like bi_errorf storing the errorlevel into it otherwise
1380 */
1381 void
maybe_errorf(int * ep,int rc,const char * fmt,...)1382 maybe_errorf(int *ep, int rc, const char *fmt, ...)
1383 {
1384 va_list va;
1385
1386 /* debugging: note that stdout not valid */
1387 shl_stdout_ok = false;
1388
1389 exstat = rc;
1390
1391 va_start(va, fmt);
1392 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1393 (ep ? VWARNINGF_BUILTIN : 0), fmt, va);
1394 va_end(va);
1395
1396 if (!ep)
1397 goto and_out;
1398 *ep = rc;
1399
1400 /* POSIX special builtins cause non-interactive shells to exit */
1401 if (builtin_spec) {
1402 builtin_argv0 = NULL;
1403 /* may not want to use LERROR here */
1404 and_out:
1405 unwind(LERROR);
1406 }
1407 }
1408
1409 /* Called when something that shouldn't happen does */
1410 void
internal_errorf(const char * fmt,...)1411 internal_errorf(const char *fmt, ...)
1412 {
1413 va_list va;
1414
1415 va_start(va, fmt);
1416 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1417 va_end(va);
1418 unwind(LERROR);
1419 }
1420
1421 void
internal_warningf(const char * fmt,...)1422 internal_warningf(const char *fmt, ...)
1423 {
1424 va_list va;
1425
1426 va_start(va, fmt);
1427 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1428 va_end(va);
1429 }
1430
1431 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
1432 void
error_prefix(bool fileline)1433 error_prefix(bool fileline)
1434 {
1435 /* Avoid foo: foo[2]: ... */
1436 if (!fileline || !source || !source->file ||
1437 strcmp(source->file, kshname) != 0)
1438 shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-'));
1439 if (fileline && source && source->file != NULL) {
1440 shf_fprintf(shl_out, "%s[%lu]: ", source->file,
1441 (unsigned long)(source->errline ?
1442 source->errline : source->line));
1443 source->errline = 0;
1444 }
1445 }
1446
1447 /* printf to shl_out (stderr) with flush */
1448 void
shellf(const char * fmt,...)1449 shellf(const char *fmt, ...)
1450 {
1451 va_list va;
1452
1453 if (!initio_done)
1454 /* shl_out may not be set up yet... */
1455 return;
1456 va_start(va, fmt);
1457 shf_vfprintf(shl_out, fmt, va);
1458 va_end(va);
1459 shf_flush(shl_out);
1460 }
1461
1462 /* printf to shl_stdout (stdout) */
1463 void
shprintf(const char * fmt,...)1464 shprintf(const char *fmt, ...)
1465 {
1466 va_list va;
1467
1468 if (!shl_stdout_ok)
1469 internal_errorf("shl_stdout not valid");
1470 va_start(va, fmt);
1471 shf_vfprintf(shl_stdout, fmt, va);
1472 va_end(va);
1473 }
1474
1475 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
1476 int
can_seek(int fd)1477 can_seek(int fd)
1478 {
1479 struct stat statb;
1480
1481 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
1482 SHF_UNBUF : 0);
1483 }
1484
1485 #ifdef DF
1486 int shl_dbg_fd;
1487 #define NSHF_IOB 4
1488 #else
1489 #define NSHF_IOB 3
1490 #endif
1491 struct shf shf_iob[NSHF_IOB];
1492
1493 void
initio(void)1494 initio(void)
1495 {
1496 #ifdef DF
1497 const char *lfp;
1498 #endif
1499
1500 /* force buffer allocation */
1501 shf_fdopen(1, SHF_WR, shl_stdout);
1502 shf_fdopen(2, SHF_WR, shl_out);
1503 shf_fdopen(2, SHF_WR, shl_xtrace);
1504 #ifdef DF
1505 if ((lfp = getenv("SDMKSH_PATH")) == NULL) {
1506 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp))
1507 errorf("can't get home directory");
1508 strpathx(lfp, lfp, "mksh-dbg.txt", 1);
1509 }
1510
1511 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0)
1512 errorf("can't open debug output file %s", lfp);
1513 if (shl_dbg_fd < FDBASE) {
1514 int nfd;
1515
1516 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE);
1517 close(shl_dbg_fd);
1518 if ((shl_dbg_fd = nfd) == -1)
1519 errorf("can't dup debug output file");
1520 }
1521 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC);
1522 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg);
1523 DF("=== open ===");
1524 #endif
1525 initio_done = true;
1526 }
1527
1528 /* A dup2() with error checking */
1529 int
ksh_dup2(int ofd,int nfd,bool errok)1530 ksh_dup2(int ofd, int nfd, bool errok)
1531 {
1532 int rv;
1533
1534 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
1535 errorf(Ttoo_many_files);
1536
1537 #ifdef __ultrix
1538 /*XXX imake style */
1539 if (rv >= 0)
1540 fcntl(nfd, F_SETFD, 0);
1541 #endif
1542
1543 return (rv);
1544 }
1545
1546 /*
1547 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10),
1548 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here.
1549 */
1550 short
savefd(int fd)1551 savefd(int fd)
1552 {
1553 int nfd = fd;
1554
1555 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
1556 (errno == EBADF || errno == EPERM))
1557 return (-1);
1558 if (nfd < 0 || nfd > SHRT_MAX)
1559 errorf(Ttoo_many_files);
1560 fcntl(nfd, F_SETFD, FD_CLOEXEC);
1561 return ((short)nfd);
1562 }
1563
1564 void
restfd(int fd,int ofd)1565 restfd(int fd, int ofd)
1566 {
1567 if (fd == 2)
1568 shf_flush(&shf_iob[/* fd */ 2]);
1569 if (ofd < 0)
1570 /* original fd closed */
1571 close(fd);
1572 else if (fd != ofd) {
1573 /*XXX: what to do if this dup fails? */
1574 ksh_dup2(ofd, fd, true);
1575 close(ofd);
1576 }
1577 }
1578
1579 void
openpipe(int * pv)1580 openpipe(int *pv)
1581 {
1582 int lpv[2];
1583
1584 if (pipe(lpv) < 0)
1585 errorf("can't create pipe - try again");
1586 pv[0] = savefd(lpv[0]);
1587 if (pv[0] != lpv[0])
1588 close(lpv[0]);
1589 pv[1] = savefd(lpv[1]);
1590 if (pv[1] != lpv[1])
1591 close(lpv[1]);
1592 #ifdef __OS2__
1593 setmode(pv[0], O_BINARY);
1594 setmode(pv[1], O_BINARY);
1595 #endif
1596 }
1597
1598 void
closepipe(int * pv)1599 closepipe(int *pv)
1600 {
1601 close(pv[0]);
1602 close(pv[1]);
1603 }
1604
1605 /*
1606 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
1607 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
1608 */
1609 int
check_fd(const char * name,int mode,const char ** emsgp)1610 check_fd(const char *name, int mode, const char **emsgp)
1611 {
1612 int fd, fl;
1613
1614 if (!name[0] || name[1])
1615 goto illegal_fd_name;
1616 if (name[0] == 'p')
1617 return (coproc_getfd(mode, emsgp));
1618 if (!ctype(name[0], C_DIGIT)) {
1619 illegal_fd_name:
1620 if (emsgp)
1621 *emsgp = "illegal file descriptor name";
1622 return (-1);
1623 }
1624
1625 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) {
1626 if (emsgp)
1627 *emsgp = "bad file descriptor";
1628 return (-1);
1629 }
1630 fl &= O_ACCMODE;
1631 /*
1632 * X_OK is a kludge to disable this check for dups (x<&1):
1633 * historical shells never did this check (XXX don't know what
1634 * POSIX has to say).
1635 */
1636 if (!(mode & X_OK) && fl != O_RDWR && (
1637 ((mode & R_OK) && fl != O_RDONLY) ||
1638 ((mode & W_OK) && fl != O_WRONLY))) {
1639 if (emsgp)
1640 *emsgp = (fl == O_WRONLY) ?
1641 "fd not open for reading" :
1642 "fd not open for writing";
1643 return (-1);
1644 }
1645 return (fd);
1646 }
1647
1648 /* Called once from main */
1649 void
coproc_init(void)1650 coproc_init(void)
1651 {
1652 coproc.read = coproc.readw = coproc.write = -1;
1653 coproc.njobs = 0;
1654 coproc.id = 0;
1655 }
1656
1657 /* Called by c_read() when eof is read - close fd if it is the co-process fd */
1658 void
coproc_read_close(int fd)1659 coproc_read_close(int fd)
1660 {
1661 if (coproc.read >= 0 && fd == coproc.read) {
1662 coproc_readw_close(fd);
1663 close(coproc.read);
1664 coproc.read = -1;
1665 }
1666 }
1667
1668 /*
1669 * Called by c_read() and by iosetup() to close the other side of the
1670 * read pipe, so reads will actually terminate.
1671 */
1672 void
coproc_readw_close(int fd)1673 coproc_readw_close(int fd)
1674 {
1675 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
1676 close(coproc.readw);
1677 coproc.readw = -1;
1678 }
1679 }
1680
1681 /*
1682 * Called by c_print when a write to a fd fails with EPIPE and by iosetup
1683 * when co-process input is dup'd
1684 */
1685 void
coproc_write_close(int fd)1686 coproc_write_close(int fd)
1687 {
1688 if (coproc.write >= 0 && fd == coproc.write) {
1689 close(coproc.write);
1690 coproc.write = -1;
1691 }
1692 }
1693
1694 /*
1695 * Called to check for existence of/value of the co-process file descriptor.
1696 * (Used by check_fd() and by c_read/c_print to deal with -p option).
1697 */
1698 int
coproc_getfd(int mode,const char ** emsgp)1699 coproc_getfd(int mode, const char **emsgp)
1700 {
1701 int fd = (mode & R_OK) ? coproc.read : coproc.write;
1702
1703 if (fd >= 0)
1704 return (fd);
1705 if (emsgp)
1706 *emsgp = "no coprocess";
1707 return (-1);
1708 }
1709
1710 /*
1711 * called to close file descriptors related to the coprocess (if any)
1712 * Should be called with SIGCHLD blocked.
1713 */
1714 void
coproc_cleanup(int reuse)1715 coproc_cleanup(int reuse)
1716 {
1717 /* This to allow co-processes to share output pipe */
1718 if (!reuse || coproc.readw < 0 || coproc.read < 0) {
1719 if (coproc.read >= 0) {
1720 close(coproc.read);
1721 coproc.read = -1;
1722 }
1723 if (coproc.readw >= 0) {
1724 close(coproc.readw);
1725 coproc.readw = -1;
1726 }
1727 }
1728 if (coproc.write >= 0) {
1729 close(coproc.write);
1730 coproc.write = -1;
1731 }
1732 }
1733
1734 struct temp *
maketemp(Area * ap,Temp_type type,struct temp ** tlist)1735 maketemp(Area *ap, Temp_type type, struct temp **tlist)
1736 {
1737 char *cp;
1738 size_t len;
1739 int i, j;
1740 struct temp *tp;
1741 const char *dir;
1742 struct stat sb;
1743
1744 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
1745 /* add "/shXXXXXX.tmp" plus NUL */
1746 len = strlen(dir);
1747 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
1748 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
1749
1750 tp->shf = NULL;
1751 tp->pid = procpid;
1752 tp->type = type;
1753
1754 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
1755 tp->tffn[0] = '\0';
1756 goto maketemp_out;
1757 }
1758
1759 cp = (void *)tp;
1760 cp += offsetof(struct temp, tffn[0]);
1761 memcpy(cp, dir, len);
1762 cp += len;
1763 memcpy(cp, "/shXXXXXX.tmp", 14);
1764 /* point to the first of six Xes */
1765 cp += 3;
1766
1767 /* cyclically attempt to open a temporary file */
1768 do {
1769 /* generate random part of filename */
1770 len = 0;
1771 do {
1772 cp[len++] = digits_lc[rndget() % 36];
1773 } while (len < 6);
1774
1775 /* check if this one works */
1776 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR,
1777 0600)) < 0 && errno != EEXIST)
1778 goto maketemp_out;
1779 } while (i < 0);
1780
1781 if (type == TT_FUNSUB) {
1782 /* map us high and mark as close-on-exec */
1783 if ((j = savefd(i)) != i) {
1784 close(i);
1785 i = j;
1786 }
1787
1788 /* operation mode for the shf */
1789 j = SHF_RD;
1790 } else
1791 j = SHF_WR;
1792
1793 /* shf_fdopen cannot fail, so no fd leak */
1794 tp->shf = shf_fdopen(i, j, NULL);
1795
1796 maketemp_out:
1797 tp->next = *tlist;
1798 *tlist = tp;
1799 return (tp);
1800 }
1801
1802 /*
1803 * We use a similar collision resolution algorithm as Python 2.5.4
1804 * but with a slightly tweaked implementation written from scratch.
1805 */
1806
1807 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */
1808 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
1809
1810 static void tgrow(struct table *);
1811 static int tnamecmp(const void *, const void *);
1812
1813 static void
tgrow(struct table * tp)1814 tgrow(struct table *tp)
1815 {
1816 size_t i, j, osize, mask, perturb;
1817 struct tbl *tblp, **pp;
1818 struct tbl **ntblp, **otblp = tp->tbls;
1819
1820 if (tp->tshift > 29)
1821 internal_errorf("hash table size limit reached");
1822
1823 /* calculate old size, new shift and new size */
1824 osize = (size_t)1 << (tp->tshift++);
1825 i = osize << 1;
1826
1827 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap);
1828 /* multiplication cannot overflow: alloc2 checked that */
1829 memset(ntblp, 0, i * sizeof(struct tbl *));
1830
1831 /* table can get very full when reaching its size limit */
1832 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL :
1833 /* but otherwise, only 75% */
1834 ((i * 3) / 4);
1835 tp->tbls = ntblp;
1836 if (otblp == NULL)
1837 return;
1838
1839 mask = i - 1;
1840 for (i = 0; i < osize; i++)
1841 if ((tblp = otblp[i]) != NULL) {
1842 if ((tblp->flag & DEFINED)) {
1843 /* search for free hash table slot */
1844 j = perturb = tblp->ua.hval;
1845 goto find_first_empty_slot;
1846 find_next_empty_slot:
1847 j = (j << 2) + j + perturb + 1;
1848 perturb >>= PERTURB_SHIFT;
1849 find_first_empty_slot:
1850 pp = &ntblp[j & mask];
1851 if (*pp != NULL)
1852 goto find_next_empty_slot;
1853 /* found an empty hash table slot */
1854 *pp = tblp;
1855 tp->nfree--;
1856 } else if (!(tblp->flag & FINUSE)) {
1857 afree(tblp, tp->areap);
1858 }
1859 }
1860 afree(otblp, tp->areap);
1861 }
1862
1863 void
ktinit(Area * ap,struct table * tp,uint8_t initshift)1864 ktinit(Area *ap, struct table *tp, uint8_t initshift)
1865 {
1866 tp->areap = ap;
1867 tp->tbls = NULL;
1868 tp->tshift = ((initshift > INIT_TBLSHIFT) ?
1869 initshift : INIT_TBLSHIFT) - 1;
1870 tgrow(tp);
1871 }
1872
1873 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
1874 struct tbl *
ktscan(struct table * tp,const char * name,uint32_t h,struct tbl *** ppp)1875 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
1876 {
1877 size_t j, perturb, mask;
1878 struct tbl **pp, *p;
1879
1880 mask = ((size_t)1 << (tp->tshift)) - 1;
1881 /* search for hash table slot matching name */
1882 j = perturb = h;
1883 goto find_first_slot;
1884 find_next_slot:
1885 j = (j << 2) + j + perturb + 1;
1886 perturb >>= PERTURB_SHIFT;
1887 find_first_slot:
1888 pp = &tp->tbls[j & mask];
1889 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
1890 strcmp(p->name, name)))
1891 goto find_next_slot;
1892 /* p == NULL if not found, correct found entry otherwise */
1893 if (ppp)
1894 *ppp = pp;
1895 return (p);
1896 }
1897
1898 /* table, name (key) to enter, hash(n) */
1899 struct tbl *
ktenter(struct table * tp,const char * n,uint32_t h)1900 ktenter(struct table *tp, const char *n, uint32_t h)
1901 {
1902 struct tbl **pp, *p;
1903 size_t len;
1904
1905 Search:
1906 if ((p = ktscan(tp, n, h, &pp)))
1907 return (p);
1908
1909 if (tp->nfree == 0) {
1910 /* too full */
1911 tgrow(tp);
1912 goto Search;
1913 }
1914
1915 /* create new tbl entry */
1916 len = strlen(n);
1917 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1);
1918 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap);
1919 p->flag = 0;
1920 p->type = 0;
1921 p->areap = tp->areap;
1922 p->ua.hval = h;
1923 p->u2.field = 0;
1924 p->u.array = NULL;
1925 memcpy(p->name, n, len);
1926
1927 /* enter in tp->tbls */
1928 tp->nfree--;
1929 *pp = p;
1930 return (p);
1931 }
1932
1933 void
ktwalk(struct tstate * ts,struct table * tp)1934 ktwalk(struct tstate *ts, struct table *tp)
1935 {
1936 ts->left = (size_t)1 << (tp->tshift);
1937 ts->next = tp->tbls;
1938 }
1939
1940 struct tbl *
ktnext(struct tstate * ts)1941 ktnext(struct tstate *ts)
1942 {
1943 while (--ts->left >= 0) {
1944 struct tbl *p = *ts->next++;
1945 if (p != NULL && (p->flag & DEFINED))
1946 return (p);
1947 }
1948 return (NULL);
1949 }
1950
1951 static int
tnamecmp(const void * p1,const void * p2)1952 tnamecmp(const void *p1, const void *p2)
1953 {
1954 const struct tbl *a = *((const struct tbl * const *)p1);
1955 const struct tbl *b = *((const struct tbl * const *)p2);
1956
1957 return (ascstrcmp(a->name, b->name));
1958 }
1959
1960 struct tbl **
ktsort(struct table * tp)1961 ktsort(struct table *tp)
1962 {
1963 size_t i;
1964 struct tbl **p, **sp, **dp;
1965
1966 /*
1967 * since the table is never entirely full, no need to reserve
1968 * additional space for the trailing NULL appended below
1969 */
1970 i = (size_t)1 << (tp->tshift);
1971 p = alloc2(i, sizeof(struct tbl *), ATEMP);
1972 sp = tp->tbls; /* source */
1973 dp = p; /* dest */
1974 while (i--)
1975 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
1976 ((*dp)->flag & ARRAY)))
1977 dp++;
1978 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp);
1979 p[i] = NULL;
1980 return (p);
1981 }
1982
1983 #ifdef SIGWINCH
1984 static void
x_sigwinch(int sig MKSH_A_UNUSED)1985 x_sigwinch(int sig MKSH_A_UNUSED)
1986 {
1987 /* this runs inside interrupt context, with errno saved */
1988
1989 got_winch = 1;
1990 }
1991 #endif
1992
1993 #ifdef DF
1994 void
DF(const char * fmt,...)1995 DF(const char *fmt, ...)
1996 {
1997 va_list args;
1998 struct timeval tv;
1999 mirtime_mjd mjd;
2000
2001 mksh_lockfd(shl_dbg_fd);
2002 mksh_TIME(tv);
2003 timet2mjd(&mjd, tv.tv_sec);
2004 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ",
2005 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60,
2006 (unsigned)mjd.sec % 60, (unsigned)getpid(),
2007 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
2008 va_start(args, fmt);
2009 shf_vfprintf(shl_dbg, fmt, args);
2010 va_end(args);
2011 shf_putc('\n', shl_dbg);
2012 shf_flush(shl_dbg);
2013 mksh_unlkfd(shl_dbg_fd);
2014 }
2015 #endif
2016
2017 void
x_mkraw(int fd,mksh_ttyst * ocb,bool forread)2018 x_mkraw(int fd, mksh_ttyst *ocb, bool forread)
2019 {
2020 mksh_ttyst cb;
2021
2022 if (ocb)
2023 mksh_tcget(fd, ocb);
2024 else
2025 ocb = &tty_state;
2026
2027 cb = *ocb;
2028 if (forread) {
2029 cb.c_iflag &= ~(ISTRIP);
2030 cb.c_lflag &= ~(ICANON) | ECHO;
2031 } else {
2032 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP);
2033 cb.c_lflag &= ~(ISIG | ICANON | ECHO);
2034 }
2035 #if defined(VLNEXT) && defined(_POSIX_VDISABLE)
2036 /* OSF/1 processes lnext when ~icanon */
2037 cb.c_cc[VLNEXT] = _POSIX_VDISABLE;
2038 #endif
2039 /* SunOS 4.1.x and OSF/1 process discard(flush) when ~icanon */
2040 #if defined(VDISCARD) && defined(_POSIX_VDISABLE)
2041 cb.c_cc[VDISCARD] = _POSIX_VDISABLE;
2042 #endif
2043 cb.c_cc[VTIME] = 0;
2044 cb.c_cc[VMIN] = 1;
2045
2046 mksh_tcset(fd, &cb);
2047 }
2048
2049 #ifdef MKSH_ENVDIR
2050 static void
init_environ(void)2051 init_environ(void)
2052 {
2053 char *xp;
2054 ssize_t n;
2055 XString xs;
2056 struct shf *shf;
2057 DIR *dirp;
2058 struct dirent *dent;
2059
2060 if ((dirp = opendir(MKSH_ENVDIR)) == NULL) {
2061 warningf(false, "cannot read environment from %s: %s",
2062 MKSH_ENVDIR, cstrerror(errno));
2063 return;
2064 }
2065 XinitN(xs, 256, ATEMP);
2066 read_envfile:
2067 errno = 0;
2068 if ((dent = readdir(dirp)) != NULL) {
2069 if (skip_varname(dent->d_name, true)[0] == '\0') {
2070 strpathx(xp, MKSH_ENVDIR, dent->d_name, 1);
2071 if (!(shf = shf_open(xp, O_RDONLY, 0, 0))) {
2072 warningf(false,
2073 "cannot read environment %s from %s: %s",
2074 dent->d_name, MKSH_ENVDIR,
2075 cstrerror(errno));
2076 goto read_envfile;
2077 }
2078 afree(xp, ATEMP);
2079 n = strlen(dent->d_name);
2080 xp = Xstring(xs, xp);
2081 XcheckN(xs, xp, n + 32);
2082 memcpy(xp, dent->d_name, n);
2083 xp += n;
2084 *xp++ = '=';
2085 while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) {
2086 xp += n;
2087 if (Xnleft(xs, xp) <= 0)
2088 XcheckN(xs, xp, Xlength(xs, xp));
2089 }
2090 if (n < 0) {
2091 warningf(false,
2092 "cannot read environment %s from %s: %s",
2093 dent->d_name, MKSH_ENVDIR,
2094 cstrerror(shf_errno(shf)));
2095 } else {
2096 *xp = '\0';
2097 xp = Xstring(xs, xp);
2098 rndpush(xp);
2099 typeset(xp, IMPORT | EXPORT, 0, 0, 0);
2100 }
2101 shf_close(shf);
2102 }
2103 goto read_envfile;
2104 } else if (errno)
2105 warningf(false, "cannot read environment from %s: %s",
2106 MKSH_ENVDIR, cstrerror(errno));
2107 closedir(dirp);
2108 Xfree(xs, xp);
2109 }
2110 #else
2111 extern char **environ;
2112
2113 static void
init_environ(void)2114 init_environ(void)
2115 {
2116 const char **wp;
2117
2118 if (environ == NULL)
2119 return;
2120
2121 wp = (const char **)environ;
2122 while (*wp != NULL) {
2123 rndpush(*wp);
2124 typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
2125 ++wp;
2126 }
2127 }
2128 #endif
2129
2130 #ifdef MKSH_EARLY_LOCALE_TRACKING
2131 void
recheck_ctype(void)2132 recheck_ctype(void)
2133 {
2134 const char *ccp;
2135 uint8_t old_utfmode = UTFMODE;
2136
2137 ccp = str_val(global("LC_ALL"));
2138 if (ccp == null)
2139 ccp = str_val(global("LC_CTYPE"));
2140 if (ccp == null)
2141 ccp = str_val(global("LANG"));
2142 UTFMODE = isuc(ccp);
2143 #if HAVE_SETLOCALE_CTYPE
2144 ccp = setlocale(LC_CTYPE, ccp);
2145 #if HAVE_LANGINFO_CODESET
2146 if (!isuc(ccp))
2147 ccp = nl_langinfo(CODESET);
2148 #endif
2149 if (isuc(ccp))
2150 UTFMODE = 1;
2151 #endif
2152
2153 if (Flag(FPOSIX) && UTFMODE && !old_utfmode)
2154 warningf(true, "early locale tracking enabled UTF-8 mode while in POSIX mode, you are now noncompliant");
2155 }
2156 #endif
2157