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 1.374 2020/10/01 20:28:54 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, Tdr, initvsn, NULL,
74 Ttypeset, Tdx, "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, Tdr, TPATH, TENV, 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
110 /* this one should be defined by the standard */
111 cta(char_is_1_char, (sizeof(char) == 1) && (sizeof(signed char) == 1) &&
112 (sizeof(unsigned char) == 1));
113 cta(char_is_8_bits, ((CHAR_BIT) == 8) && ((int)(unsigned char)0xFF == 0xFF) &&
114 ((int)(unsigned char)0x100 == 0) && ((int)(unsigned char)(int)-1 == 0xFF));
115 /* the next assertion is probably not really needed */
116 cta(short_is_2_char, sizeof(short) == 2);
117 cta(short_size_no_matter_of_signedness, sizeof(short) == sizeof(unsigned short));
118 /* the next assertion is probably not really needed */
119 cta(int_is_4_char, sizeof(int) == 4);
120 cta(int_size_no_matter_of_signedness, sizeof(int) == sizeof(unsigned int));
121
122 cta(long_ge_int, sizeof(long) >= sizeof(int));
123 cta(long_size_no_matter_of_signedness, sizeof(long) == sizeof(unsigned long));
124
125 #ifndef MKSH_LEGACY_MODE
126 /* the next assertion is probably not really needed */
127 cta(ari_is_4_char, sizeof(mksh_ari_t) == 4);
128 /* but this is */
129 cta(ari_has_31_bit, 0 < (mksh_ari_t)(((((mksh_ari_t)1 << 15) << 15) - 1) * 2 + 1));
130 /* the next assertion is probably not really needed */
131 cta(uari_is_4_char, sizeof(mksh_uari_t) == 4);
132 /* but the next three are; we REQUIRE unsigned integer wraparound */
133 cta(uari_has_31_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 2 + 1));
134 cta(uari_has_32_bit, 0 < (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3));
135 cta(uari_wrap_32_bit,
136 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 3) >
137 (mksh_uari_t)(((((mksh_uari_t)1 << 15) << 15) - 1) * 4 + 4));
138 #endif
139 /* these are always required */
140 cta(ari_is_signed, (mksh_ari_t)-1 < (mksh_ari_t)0);
141 cta(uari_is_unsigned, (mksh_uari_t)-1 > (mksh_uari_t)0);
142 /* we require these to have the precisely same size and assume 2s complement */
143 cta(ari_size_no_matter_of_signedness, sizeof(mksh_ari_t) == sizeof(mksh_uari_t));
144
145 cta(sizet_size_no_matter_of_signedness, sizeof(ssize_t) == sizeof(size_t));
146 cta(sizet_voidptr_same_size, sizeof(size_t) == sizeof(void *));
147 cta(sizet_funcptr_same_size, sizeof(size_t) == sizeof(void (*)(void)));
148 /* our formatting routines assume this */
149 cta(ptr_fits_in_long, sizeof(size_t) <= sizeof(long));
150 cta(ari_fits_in_long, sizeof(mksh_ari_t) <= sizeof(long));
151
152 static mksh_uari_t
rndsetup(void)153 rndsetup(void)
154 {
155 register uint32_t h;
156 struct {
157 ALLOC_ITEM alloc_INT;
158 void *dataptr, *stkptr, *mallocptr;
159 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
160 sigjmp_buf jbuf;
161 #endif
162 struct timeval tv;
163 } *bufptr;
164 char *cp;
165
166 cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM);
167 /* clear the allocated space, for valgrind and to avoid UB */
168 memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM));
169 /* undo what alloc() did to the malloc result address */
170 bufptr = (void *)(cp - sizeof(ALLOC_ITEM));
171 /* PIE or something similar provides us with deltas here */
172 bufptr->dataptr = &rndsetupstate;
173 /* ASLR in at least Windows, Linux, some BSDs */
174 bufptr->stkptr = &bufptr;
175 /* randomised malloc in BSD (and possibly others) */
176 bufptr->mallocptr = bufptr;
177 #if defined(__GLIBC__) && (__GLIBC__ >= 2)
178 /* glibc pointer guard */
179 sigsetjmp(bufptr->jbuf, 1);
180 #endif
181 /* introduce variation (and yes, second arg MBZ for portability) */
182 mksh_TIME(bufptr->tv);
183
184 #ifdef MKSH_ALLOC_CATCH_UNDERRUNS
185 mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE);
186 #endif
187 h = chvt_rndsetup(bufptr, sizeof(*bufptr));
188
189 afree(cp, APERM);
190 return ((mksh_uari_t)h);
191 }
192
193 void
chvt_reinit(void)194 chvt_reinit(void)
195 {
196 kshpid = procpid = getpid();
197 ksheuid = geteuid();
198 kshpgrp = getpgrp();
199 kshppid = getppid();
200 }
201
202 static const char *empty_argv[] = {
203 Tmksh, NULL
204 };
205
206 static uint8_t
isuc(const char * cx)207 isuc(const char *cx) {
208 char *cp, *x;
209 uint8_t rv = 0;
210
211 if (!cx || !*cx)
212 return (0);
213
214 /* uppercase a string duplicate */
215 strdupx(x, cx, ATEMP);
216 cp = x;
217 while ((*cp = ksh_toupper(*cp)))
218 ++cp;
219
220 /* check for UTF-8 */
221 if (strstr(x, "UTF-8") || strstr(x, "UTF8"))
222 rv = 1;
223
224 /* free copy and out */
225 afree(x, ATEMP);
226 return (rv);
227 }
228
229 static int
main_init(int argc,const char * argv[],Source ** sp,struct block ** lp)230 main_init(int argc, const char *argv[], Source **sp, struct block **lp)
231 {
232 int argi, i;
233 Source *s = NULL;
234 struct block *l;
235 unsigned char restricted_shell = 0, errexit, utf_flag;
236 char *cp;
237 #ifndef MKSH_NO_INITCOMS
238 const char *ccp, **wp;
239 #else
240 const char *ccp;
241 #endif // MKSH_NO_INITCOMS
242 struct tbl *vp;
243 struct stat s_stdin;
244 #if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
245 ssize_t k;
246 #endif
247
248 #if defined(MKSH_EBCDIC) || defined(MKSH_FAUX_EBCDIC)
249 ebcdic_init();
250 #endif
251 set_ifs(TC_IFSWS);
252
253 #ifdef __OS2__
254 os2_init(&argc, &argv);
255 #define builtin_name_cmp stricmp
256 #else
257 #define builtin_name_cmp strcmp
258 #endif
259
260 /* do things like getpgrp() et al. */
261 chvt_reinit();
262
263 /* make sure argv[] is sane, for weird OSes */
264 if (!*argv) {
265 argv = empty_argv;
266 argc = 1;
267 }
268 kshname = argv[0];
269
270 /* initialise permanent Area */
271 ainit(&aperm);
272 /* max. name length: -2147483648 = 11 (+ NUL) */
273 vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM);
274
275 /* set up base environment */
276 env.type = E_NONE;
277 ainit(&env.area);
278 /* set up global l->vars and l->funs */
279 newblock();
280
281 /* Do this first so output routines (eg, errorf, shellf) can work */
282 initio();
283
284 /* determine the basename (without '-' or path) of the executable */
285 ccp = kshname;
286 goto begin_parsing_kshname;
287 while ((i = ccp[argi++])) {
288 if (mksh_cdirsep(i)) {
289 ccp += argi;
290 begin_parsing_kshname:
291 argi = 0;
292 }
293 }
294 Flag(FLOGIN) = (ord(*ccp) == ORD('-')) || (ord(*kshname) == ORD('-'));
295 if (ord(*ccp) == ORD('-'))
296 ++ccp;
297 if (!*ccp)
298 ccp = empty_argv[0];
299
300 /*
301 * Turn on nohup by default. (AT&T ksh does not have a nohup
302 * option - it always sends the hup).
303 */
304 Flag(FNOHUP) = 1;
305
306 /*
307 * Turn on brace expansion by default. AT&T kshs that have
308 * alternation always have it on.
309 */
310 Flag(FBRACEEXPAND) = 1;
311
312 /*
313 * Turn on "set -x" inheritance by default.
314 */
315 Flag(FXTRACEREC) = 1;
316
317 /* define built-in commands and see if we were called as one */
318 ktinit(APERM, &builtins,
319 /* currently up to 52 builtins: 75% of 128 = 2^7 */
320 7);
321 for (i = 0; mkshbuiltins[i].name != NULL; ++i) {
322 const char *builtin_name;
323
324 builtin_name = builtin(mkshbuiltins[i].name,
325 mkshbuiltins[i].func);
326 if (!builtin_name_cmp(ccp, builtin_name)) {
327 /* canonicalise argv[0] */
328 ccp = builtin_name;
329 as_builtin = true;
330 }
331 }
332
333 if (!as_builtin) {
334 /* check for -T option early */
335 argi = parse_args(argv, OF_FIRSTTIME, NULL);
336 if (argi < 0)
337 return (1);
338 /* called as rsh, rmksh, -rsh, RKSH.EXE, etc.? */
339 if (ksh_eq(*ccp, 'R', 'r')) {
340 ++ccp;
341 ++restricted_shell;
342 }
343 #if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
344 /* are we called as -rsh or /bin/sh or SH.EXE or so? */
345 if (ksh_eq(ccp[0], 'S', 's') &&
346 ksh_eq(ccp[1], 'H', 'h')) {
347 /* either also turns off braceexpand */
348 #ifdef MKSH_BINSHPOSIX
349 /* enable better POSIX conformance */
350 change_flag(FPOSIX, OF_FIRSTTIME, true);
351 #endif
352 #ifdef MKSH_BINSHREDUCED
353 /* enable kludge/compat mode */
354 change_flag(FSH, OF_FIRSTTIME, true);
355 #endif
356 }
357 #endif
358 }
359
360 initvar();
361
362 inittraps();
363
364 coproc_init();
365
366 /* set up variable and command dictionaries */
367 ktinit(APERM, &taliases, 0);
368 ktinit(APERM, &aliases, 0);
369 #ifndef MKSH_NOPWNAM
370 ktinit(APERM, &homedirs, 0);
371 #endif
372
373 /* define shell keywords */
374 initkeywords();
375
376 init_histvec();
377
378 /* initialise tty size before importing environment */
379 change_winsz();
380
381 #ifdef _PATH_DEFPATH
382 def_path = _PATH_DEFPATH;
383 #else
384 #ifdef _CS_PATH
385 if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
386 confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
387 def_path = cp;
388 else
389 #endif
390 /*
391 * this is uniform across all OSes unless it
392 * breaks somewhere hard; don't try to optimise,
393 * e.g. add stuff for Interix or remove /usr
394 * for HURD, because e.g. Debian GNU/HURD is
395 * "keeping a regular /usr"; this is supposed
396 * to be a sane 'basic' default PATH
397 */
398 def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
399 MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
400 MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
401 MKSH_UNIXROOT "/usr/sbin";
402 #endif
403
404 /*
405 * Set PATH to def_path (will set the path global variable).
406 * (import of environment below will probably change this setting).
407 */
408 vp = global(TPATH);
409 /* setstr can't fail here */
410 setstr(vp, def_path, KSH_RETURN_ERROR);
411
412 #ifndef MKSH_NO_CMDLINE_EDITING
413 /*
414 * Set edit mode to emacs by default, may be overridden
415 * by the environment or the user. Also, we want tab completion
416 * on in vi by default.
417 */
418 change_flag(FEMACS, OF_SPECIAL, true);
419 #if !MKSH_S_NOVI
420 Flag(FVITABCOMPLETE) = 1;
421 #endif
422 #endif
423
424 /* import environment */
425 init_environ();
426
427 /* for security */
428 typeset(TinitIFS, 0, 0, 0, 0);
429
430 /* assign default shell variable values */
431 typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0);
432 substitute(initsubs, 0);
433
434 /* Figure out the current working directory and set $PWD */
435 vp = global(TPWD);
436 cp = str_val(vp);
437 /* Try to use existing $PWD if it is valid */
438 set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
439 Tdot, true)) ? cp : NULL);
440 if (current_wd[0])
441 simplify_path(current_wd);
442 /* Only set pwd if we know where we are or if it had a bogus value */
443 if (current_wd[0] || *cp)
444 /* setstr can't fail here */
445 setstr(vp, current_wd, KSH_RETURN_ERROR);
446
447 #ifndef MKSH_NO_INITCOMS
448 for (wp = initcoms; *wp != NULL; wp++) {
449 c_builtin(wp);
450 while (*wp != NULL)
451 wp++;
452 }
453 #endif // MKSH_NO_INITCOMS
454 setint_n(global("OPTIND"), 1, 10);
455
456 kshuid = getuid();
457 kshgid = getgid();
458 kshegid = getegid();
459
460 safe_prompt = ksheuid ? "$ " : "# ";
461 vp = global("PS1");
462 /* Set PS1 if unset or we are root and prompt doesn't contain a # */
463 if (!(vp->flag & ISSET) ||
464 (!ksheuid && !strchr(str_val(vp), '#')))
465 /* setstr can't fail here */
466 setstr(vp, safe_prompt, KSH_RETURN_ERROR);
467 setint_n((vp = global("BASHPID")), 0, 10);
468 vp->flag |= INT_U;
469 setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
470 vp->flag |= INT_U;
471 setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
472 vp->flag |= INT_U;
473 setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
474 vp->flag |= INT_U;
475 setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
476 vp->flag |= INT_U;
477 setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
478 vp->flag |= INT_U;
479 setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
480 vp->flag |= INT_U;
481 setint_n((vp = global("RANDOM")), rndsetup(), 10);
482 vp->flag |= INT_U;
483 setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
484
485 /* Set this before parsing arguments */
486 Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
487
488 /* record if monitor is set on command line (see j_init() in jobs.c) */
489 #ifndef MKSH_UNEMPLOYED
490 Flag(FMONITOR) = 127;
491 #endif
492 /* this to note if utf-8 mode is set on command line (see below) */
493 UTFMODE = 2;
494
495 if (!as_builtin) {
496 argi = parse_args(argv, OF_CMDLINE, NULL);
497 if (argi < 0)
498 return (1);
499 }
500
501 /* process this later only, default to off (hysterical raisins) */
502 utf_flag = UTFMODE;
503 UTFMODE = 0;
504
505 if (as_builtin) {
506 /* auto-detect from environment variables, always */
507 utf_flag = 3;
508 } else if (Flag(FCOMMAND)) {
509 s = pushs(SSTRINGCMDLINE, ATEMP);
510 if (!(s->start = s->str = argv[argi++]))
511 errorf(Tf_optfoo, "", "", 'c', Treq_arg);
512 while (*s->str) {
513 if (ctype(*s->str, C_QUOTE) && (*s->str != '\''))
514 break;
515 s->str++;
516 }
517 if (!*s->str)
518 s->flags |= SF_MAYEXEC;
519 s->str = s->start;
520 #ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
521 /* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
522 if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
523 ++argi;
524 #endif
525 if (argv[argi])
526 kshname = argv[argi++];
527 } else if (argi < argc && !Flag(FSTDIN)) {
528 s = pushs(SFILE, ATEMP);
529 #ifdef __OS2__
530 /*
531 * A bug in OS/2 extproc (like shebang) handling makes
532 * it not pass the full pathname of a script, so we need
533 * to search for it. This changes the behaviour of a
534 * simple "mksh foo", but can't be helped.
535 */
536 s->file = argv[argi++];
537 if (search_access(s->file, X_OK) != 0)
538 s->file = search_path(s->file, path, X_OK, NULL);
539 if (!s->file || !*s->file)
540 s->file = argv[argi - 1];
541 #else
542 s->file = argv[argi++];
543 #endif
544 s->u.shf = shf_open(s->file, O_RDONLY | O_MAYEXEC, 0,
545 SHF_MAPHI | SHF_CLEXEC);
546 if (s->u.shf == NULL) {
547 shl_stdout_ok = false;
548 warningf(true, Tf_sD_s, s->file, cstrerror(errno));
549 /* mandated by SUSv4 */
550 exstat = 127;
551 unwind(LERROR);
552 }
553 kshname = s->file;
554 } else {
555 Flag(FSTDIN) = 1;
556 s = pushs(SSTDIN, ATEMP);
557 s->file = "<stdin>";
558 s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
559 NULL);
560 if (isatty(0) && isatty(2)) {
561 Flag(FTALKING) = Flag(FTALKING_I) = 1;
562 /* The following only if isatty(0) */
563 s->flags |= SF_TTY;
564 s->u.shf->flags |= SHF_INTERRUPT;
565 s->file = NULL;
566 }
567 }
568
569 /* this bizarreness is mandated by POSIX */
570 if (Flag(FTALKING) && fstat(0, &s_stdin) >= 0 &&
571 S_ISCHR(s_stdin.st_mode))
572 reset_nonblock(0);
573
574 /* initialise job control */
575 j_init();
576 /* do this after j_init() which calls tty_init_state() */
577 if (Flag(FTALKING)) {
578 if (utf_flag == 2) {
579 #ifndef MKSH_ASSUME_UTF8
580 /* auto-detect from locale or environment */
581 utf_flag = 4;
582 #else /* this may not be an #elif */
583 #if MKSH_ASSUME_UTF8
584 utf_flag = 1;
585 #else
586 /* always disable UTF-8 (for interactive) */
587 utf_flag = 0;
588 #endif
589 #endif
590 }
591 #ifndef MKSH_NO_CMDLINE_EDITING
592 x_init();
593 #endif
594 }
595
596 #ifdef SIGWINCH
597 sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
598 setsig(&sigtraps[SIGWINCH], x_sigwinch,
599 SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
600 #endif
601
602 l = e->loc;
603 if (as_builtin) {
604 l->argc = argc;
605 l->argv = argv;
606 l->argv[0] = ccp;
607 } else {
608 l->argc = argc - argi;
609 /*
610 * allocate a new array because otherwise, when we modify
611 * it in-place, ps(1) output changes; the meaning of argc
612 * here is slightly different as it excludes kshname, and
613 * we add a trailing NULL sentinel as well
614 */
615 l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
616 l->argv[0] = kshname;
617 memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
618 l->argv[l->argc + 1] = NULL;
619 getopts_reset(1);
620 }
621
622 /* divine the initial state of the utf8-mode Flag */
623 ccp = null;
624 switch (utf_flag) {
625
626 /* auto-detect from locale or environment */
627 case 4:
628 #if HAVE_SETLOCALE_CTYPE
629 ccp = setlocale(LC_CTYPE, "");
630 #if HAVE_LANGINFO_CODESET
631 if (!isuc(ccp))
632 ccp = nl_langinfo(CODESET);
633 #endif
634 if (!isuc(ccp))
635 ccp = null;
636 #endif
637 /* FALLTHROUGH */
638
639 /* auto-detect from environment */
640 case 3:
641 /* these were imported from environ earlier */
642 if (ccp == null)
643 ccp = str_val(global("LC_ALL"));
644 if (ccp == null)
645 ccp = str_val(global("LC_CTYPE"));
646 if (ccp == null)
647 ccp = str_val(global("LANG"));
648 UTFMODE = isuc(ccp);
649 break;
650
651 /* not set on command line, not FTALKING */
652 case 2:
653 /* unknown values */
654 default:
655 utf_flag = 0;
656 /* FALLTHROUGH */
657
658 /* known values */
659 case 1:
660 case 0:
661 UTFMODE = utf_flag;
662 break;
663 }
664
665 /* Disable during .profile/ENV reading */
666 restricted_shell |= Flag(FRESTRICTED);
667 Flag(FRESTRICTED) = 0;
668 errexit = Flag(FERREXIT);
669 Flag(FERREXIT) = 0;
670
671 /* save flags for "set +o" handling */
672 memcpy(baseline_flags, shell_flags, sizeof(shell_flags));
673 /* disable these because they have special handling */
674 baseline_flags[(int)FPOSIX] = 0;
675 baseline_flags[(int)FSH] = 0;
676 /* ensure these always show up setting, for FPOSIX/FSH */
677 baseline_flags[(int)FBRACEEXPAND] = 0;
678 baseline_flags[(int)FUNNYCODE] = 0;
679 #if !defined(MKSH_SMALL) || defined(DEBUG)
680 /* mark as initialised */
681 baseline_flags[(int)FNFLAGS] = 1;
682 #endif
683 if (as_builtin)
684 goto skip_startup_files;
685
686 /*
687 * Do this before profile/$ENV so that if it causes problems in them,
688 * user will know why things broke.
689 */
690 if (!current_wd[0] && Flag(FTALKING))
691 warningf(false, "can't determine current directory");
692
693 if (Flag(FLOGIN))
694 include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
695 if (Flag(FPRIVILEGED)) {
696 include(MKSH_SUID_PROFILE, 0, NULL, true);
697 /* note whether -p was enabled during startup */
698 if (Flag(FPRIVILEGED) == 1)
699 /* allow set -p to setuid() later */
700 Flag(FPRIVILEGED) = 3;
701 else
702 /* turn off -p if not set explicitly */
703 change_flag(FPRIVILEGED, OF_INTERNAL, false);
704 /* track shell-imposed changes */
705 baseline_flags[(int)FPRIVILEGED] = Flag(FPRIVILEGED);
706 } else {
707 if (Flag(FLOGIN))
708 include(substitute("$HOME/.profile", 0), 0, NULL, true);
709 if (Flag(FTALKING)) {
710 #ifndef ADAPT_FOR_LITEOS_A
711 cp = substitute("${ENV:-" MKSHRC_PATH "}", DOTILDE);
712 #else // ADAPT_FOR_LITEOS_A
713 cp = substitute("${ENV:-" MKSHRC_PATH "}", 0);
714 #endif // ADAPT_FOR_LITEOS_A
715 if (cp[0] != '\0')
716 include(cp, 0, NULL, true);
717 }
718 }
719 if (restricted_shell) {
720 c_builtin(restr_com);
721 /* After typeset command... */
722 Flag(FRESTRICTED) = 1;
723 /* track shell-imposed changes */
724 baseline_flags[(int)FRESTRICTED] = 1;
725 }
726 Flag(FERREXIT) = errexit;
727
728 if (Flag(FTALKING) && s)
729 hist_init(s);
730 else {
731 /* set after ENV */
732 skip_startup_files:
733 Flag(FTRACKALL) = 1;
734 /* track shell-imposed change (might lower surprise) */
735 baseline_flags[(int)FTRACKALL] = 1;
736 }
737
738 alarm_init();
739
740 *sp = s;
741 *lp = l;
742 return (0);
743 }
744
745 /* this indirection barrier reduces stack usage during normal operation */
746
747 int
main(int argc,const char * argv[])748 main(int argc, const char *argv[])
749 {
750 int rv;
751 Source *s;
752 struct block *l;
753
754 if ((rv = main_init(argc, argv, &s, &l)) == 0) {
755 if (as_builtin) {
756 rv = c_builtin(l->argv);
757 } else {
758 shell(s, 0);
759 /* NOTREACHED */
760 }
761 }
762 return (rv);
763 }
764
765 int
include(const char * name,int argc,const char ** argv,bool intr_ok)766 include(const char *name, int argc, const char **argv, bool intr_ok)
767 {
768 Source *volatile s = NULL;
769 struct shf *shf;
770 const char **volatile old_argv;
771 volatile int old_argc;
772 int i;
773
774 shf = shf_open(name, O_RDONLY | O_MAYEXEC, 0, SHF_MAPHI | SHF_CLEXEC);
775 if (shf == NULL)
776 return (-1);
777
778 if (argv) {
779 old_argv = e->loc->argv;
780 old_argc = e->loc->argc;
781 } else {
782 old_argv = NULL;
783 old_argc = 0;
784 }
785 newenv(E_INCL);
786 if ((i = kshsetjmp(e->jbuf))) {
787 quitenv(s ? s->u.shf : NULL);
788 if (old_argv) {
789 e->loc->argv = old_argv;
790 e->loc->argc = old_argc;
791 }
792 switch (i) {
793 case LRETURN:
794 case LERROR:
795 case LERREXT:
796 /* see below */
797 return (exstat & 0xFF);
798 case LINTR:
799 /*
800 * intr_ok is set if we are including .profile or $ENV.
801 * If user ^Cs out, we don't want to kill the shell...
802 */
803 if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
804 return (1);
805 /* FALLTHROUGH */
806 case LEXIT:
807 case LLEAVE:
808 case LSHELL:
809 unwind(i);
810 /* NOTREACHED */
811 default:
812 internal_errorf(Tunexpected_type, Tunwind, Tsource, i);
813 /* NOTREACHED */
814 }
815 }
816 if (argv) {
817 e->loc->argv = argv;
818 e->loc->argc = argc;
819 }
820 s = pushs(SFILE, ATEMP);
821 s->u.shf = shf;
822 strdupx(s->file, name, ATEMP);
823 i = shell(s, 1);
824 quitenv(s->u.shf);
825 if (old_argv) {
826 e->loc->argv = old_argv;
827 e->loc->argc = old_argc;
828 }
829 /* & 0xff to ensure value not -1 */
830 return (i & 0xFF);
831 }
832
833 /* spawn a command into a shell optionally keeping track of the line number */
834 int
command(const char * comm,int line)835 command(const char *comm, int line)
836 {
837 Source *s, *sold = source;
838 int rv;
839
840 s = pushs(SSTRING, ATEMP);
841 s->start = s->str = comm;
842 s->line = line;
843 rv = shell(s, 1);
844 source = sold;
845 return (rv);
846 }
847
848 /*
849 * run the commands from the input source, returning status.
850 */
851 int
shell(Source * volatile s,volatile int level)852 shell(Source * volatile s, volatile int level)
853 {
854 struct op *t;
855 volatile bool wastty = tobool(s->flags & SF_TTY);
856 volatile uint8_t attempts = 13;
857 volatile bool interactive = (level == 0) && Flag(FTALKING);
858 volatile bool sfirst = true;
859 Source *volatile old_source = source;
860 int i;
861
862 newenv(level == 2 ? E_EVAL : E_PARSE);
863 if (level == 2)
864 e->flags |= EF_IN_EVAL;
865 if (interactive)
866 really_exit = false;
867 switch ((i = kshsetjmp(e->jbuf))) {
868 case 0:
869 break;
870 case LBREAK:
871 case LCONTIN:
872 /* assert: interactive == false */
873 source = old_source;
874 quitenv(NULL);
875 if (level == 2) {
876 /* keep on going */
877 unwind(i);
878 /* NOTREACHED */
879 }
880 internal_errorf(Tf_cant_s, Tshell,
881 i == LBREAK ? Tbreak : Tcontinue);
882 /* NOTREACHED */
883 case LINTR:
884 /* we get here if SIGINT not caught or ignored */
885 case LERROR:
886 case LERREXT:
887 case LSHELL:
888 if (interactive) {
889 if (i == LINTR)
890 shellf("\n");
891 /*
892 * Reset any eof that was read as part of a
893 * multiline command.
894 */
895 if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
896 s->type = SSTDIN;
897 /*
898 * Used by exit command to get back to
899 * top level shell. Kind of strange since
900 * interactive is set if we are reading from
901 * a tty, but to have stopped jobs, one only
902 * needs FMONITOR set (not FTALKING/SF_TTY)...
903 */
904 /* toss any input we have so far */
905 yyrecursive_pop(true);
906 s->start = s->str = null;
907 retrace_info = NULL;
908 herep = heres;
909 break;
910 }
911 /* FALLTHROUGH */
912 case LEXIT:
913 case LLEAVE:
914 case LRETURN:
915 source = old_source;
916 quitenv(NULL);
917 if (i == LERREXT && level == 2)
918 return (exstat & 0xFF);
919 /* keep on going */
920 unwind(i);
921 /* NOTREACHED */
922 default:
923 source = old_source;
924 quitenv(NULL);
925 internal_errorf(Tunexpected_type, Tunwind, Tshell, i);
926 /* NOTREACHED */
927 }
928 while (/* CONSTCOND */ 1) {
929 if (trap)
930 runtraps(0);
931
932 if (s->next == NULL) {
933 if (Flag(FVERBOSE))
934 s->flags |= SF_ECHO;
935 else
936 s->flags &= ~SF_ECHO;
937 }
938 if (interactive) {
939 j_notify();
940 set_prompt(PS1, s);
941 }
942 t = compile(s, sfirst, true);
943 if (interactive)
944 histsave(&s->line, NULL, HIST_FLUSH, true);
945 sfirst = false;
946 if (!t)
947 goto source_no_tree;
948 if (t->type == TEOF) {
949 if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
950 shellf("Use 'exit' to leave mksh\n");
951 s->type = SSTDIN;
952 } else if (wastty && !really_exit &&
953 j_stopped_running()) {
954 really_exit = true;
955 s->type = SSTDIN;
956 } else {
957 /*
958 * this for POSIX which says EXIT traps
959 * shall be taken in the environment
960 * immediately after the last command
961 * executed.
962 */
963 if (level == 0)
964 unwind(LEXIT);
965 break;
966 }
967 } else if ((s->flags & SF_MAYEXEC) && t->type == TCOM)
968 t->u.evalflags |= DOTCOMEXEC;
969 if (!Flag(FNOEXEC) || (s->flags & SF_TTY))
970 exstat = execute(t, 0, NULL) & 0xFF;
971
972 if (t->type != TEOF && interactive && really_exit)
973 really_exit = false;
974
975 source_no_tree:
976 reclaim();
977 }
978 source = old_source;
979 quitenv(NULL);
980 return (exstat & 0xFF);
981 }
982
983 /* return to closest error handler or shell(), exit if none found */
984 /* note: i MUST NOT be 0 */
985 void
unwind(int i)986 unwind(int i)
987 {
988 /* during eval, skip FERREXIT trap */
989 if (i == LERREXT && (e->flags & EF_IN_EVAL))
990 goto defer_traps;
991
992 /* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
993 if (i == LEXIT || ((i == LERROR || i == LERREXT || i == LINTR) &&
994 sigtraps[ksh_SIGEXIT].trap &&
995 (!Flag(FTALKING) || Flag(FERREXIT)))) {
996 ++trap_nested;
997 runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
998 --trap_nested;
999 i = LLEAVE;
1000 } else if (Flag(FERREXIT) && (i == LERROR || i == LERREXT || i == LINTR)) {
1001 ++trap_nested;
1002 runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
1003 --trap_nested;
1004 i = LLEAVE;
1005 }
1006 defer_traps:
1007
1008 while (/* CONSTCOND */ 1) {
1009 switch (e->type) {
1010 case E_PARSE:
1011 case E_FUNC:
1012 case E_INCL:
1013 case E_LOOP:
1014 case E_ERRH:
1015 case E_EVAL:
1016 kshlongjmp(e->jbuf, i);
1017 /* NOTREACHED */
1018 case E_NONE:
1019 if (i == LINTR)
1020 e->flags |= EF_FAKE_SIGDIE;
1021 /* FALLTHROUGH */
1022 default:
1023 quitenv(NULL);
1024 }
1025 }
1026 }
1027
1028 void
newenv(int type)1029 newenv(int type)
1030 {
1031 struct env *ep;
1032 char *cp;
1033
1034 /*
1035 * struct env includes ALLOC_ITEM for alignment constraints
1036 * so first get the actually used memory, then assign it
1037 */
1038 cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP);
1039 /* undo what alloc() did to the malloc result address */
1040 ep = (void *)(cp - sizeof(ALLOC_ITEM));
1041 /* initialise public members of struct env (not the ALLOC_ITEM) */
1042 ainit(&ep->area);
1043 ep->oenv = e;
1044 ep->loc = e->loc;
1045 ep->savefd = NULL;
1046 ep->temps = NULL;
1047 ep->yyrecursive_statep = NULL;
1048 ep->type = type;
1049 ep->flags = e->flags & EF_IN_EVAL;
1050 e = ep;
1051 }
1052
1053 void
quitenv(struct shf * shf)1054 quitenv(struct shf *shf)
1055 {
1056 struct env *ep = e;
1057 char *cp;
1058 int fd;
1059
1060 yyrecursive_pop(true);
1061 while (ep->oenv && ep->oenv->loc != ep->loc)
1062 popblock();
1063 if (ep->savefd != NULL) {
1064 for (fd = 0; fd < NUFILE; fd++)
1065 /* if ep->savefd[fd] < 0, means fd was closed */
1066 if (ep->savefd[fd])
1067 restfd(fd, ep->savefd[fd]);
1068 if (ep->savefd[2])
1069 /* Clear any write errors */
1070 shf_reopen(2, SHF_WR, shl_out);
1071 }
1072 /*
1073 * Bottom of the stack.
1074 * Either main shell is exiting or cleanup_parents_env() was called.
1075 */
1076 if (ep->oenv == NULL) {
1077 #ifdef DEBUG_LEAKS
1078 int i;
1079 #endif
1080
1081 if (ep->type == E_NONE) {
1082 /* Main shell exiting? */
1083 #if HAVE_PERSISTENT_HISTORY
1084 if (Flag(FTALKING))
1085 hist_finish();
1086 #endif
1087 j_exit();
1088 if (ep->flags & EF_FAKE_SIGDIE) {
1089 int sig = (exstat & 0xFF) - 128;
1090
1091 /*
1092 * ham up our death a bit (AT&T ksh
1093 * only seems to do this for SIGTERM)
1094 * Don't do it for SIGQUIT, since we'd
1095 * dump a core..
1096 */
1097 if ((sig == SIGINT || sig == SIGTERM) &&
1098 (kshpgrp == kshpid)) {
1099 setsig(&sigtraps[sig], SIG_DFL,
1100 SS_RESTORE_CURR | SS_FORCE);
1101 kill(0, sig);
1102 }
1103 }
1104 }
1105 if (shf)
1106 shf_close(shf);
1107 reclaim();
1108 #ifdef DEBUG_LEAKS
1109 #ifndef MKSH_NO_CMDLINE_EDITING
1110 x_done();
1111 #endif
1112 #ifndef MKSH_NOPROSPECTOFWORK
1113 /* block at least SIGCHLD during/after afreeall */
1114 sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
1115 #endif
1116 afreeall(APERM);
1117 for (fd = 3; fd < NUFILE; fd++)
1118 if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
1119 (i & FD_CLOEXEC))
1120 close(fd);
1121 close(2);
1122 close(1);
1123 close(0);
1124 #endif
1125 exit(exstat & 0xFF);
1126 }
1127 if (shf)
1128 shf_close(shf);
1129 reclaim();
1130
1131 e = e->oenv;
1132
1133 /* free the struct env - tricky due to the ALLOC_ITEM inside */
1134 cp = (void *)ep;
1135 afree(cp + sizeof(ALLOC_ITEM), ATEMP);
1136 }
1137
1138 /* Called after a fork to cleanup stuff left over from parents environment */
1139 void
cleanup_parents_env(void)1140 cleanup_parents_env(void)
1141 {
1142 struct env *ep;
1143 int fd;
1144
1145 /*
1146 * Don't clean up temporary files - parent will probably need them.
1147 * Also, can't easily reclaim memory since variables, etc. could be
1148 * anywhere.
1149 */
1150
1151 /* close all file descriptors hiding in savefd */
1152 for (ep = e; ep; ep = ep->oenv) {
1153 if (ep->savefd) {
1154 for (fd = 0; fd < NUFILE; fd++)
1155 if (ep->savefd[fd] > 0)
1156 close(ep->savefd[fd]);
1157 afree(ep->savefd, &ep->area);
1158 ep->savefd = NULL;
1159 }
1160 #ifdef DEBUG_LEAKS
1161 if (ep->type != E_NONE)
1162 ep->type = E_GONE;
1163 #endif
1164 }
1165 #ifndef DEBUG_LEAKS
1166 e->oenv = NULL;
1167 #endif
1168 }
1169
1170 /* Called just before an execve cleanup stuff temporary files */
1171 void
cleanup_proc_env(void)1172 cleanup_proc_env(void)
1173 {
1174 struct env *ep;
1175
1176 for (ep = e; ep; ep = ep->oenv)
1177 remove_temps(ep->temps);
1178 }
1179
1180 /* remove temp files and free ATEMP Area */
1181 static void
reclaim(void)1182 reclaim(void)
1183 {
1184 struct block *l;
1185
1186 while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) {
1187 e->loc = l->next;
1188 afreeall(&l->area);
1189 }
1190
1191 remove_temps(e->temps);
1192 e->temps = NULL;
1193
1194 /*
1195 * if the memory backing source is reclaimed, things
1196 * will end up badly when a function expecting it to
1197 * be valid is run; a NULL pointer is easily debugged
1198 */
1199 if (source && source->areap == &e->area)
1200 source = NULL;
1201 afreeall(&e->area);
1202 }
1203
1204 static void
remove_temps(struct temp * tp)1205 remove_temps(struct temp *tp)
1206 {
1207 while (tp) {
1208 if (tp->pid == procpid)
1209 unlink(tp->tffn);
1210 tp = tp->next;
1211 }
1212 }
1213
1214 /*
1215 * Initialise tty_fd. Used for tracking the size of the terminal,
1216 * saving/resetting tty modes upon foreground job completion, and
1217 * for setting up the tty process group. Return values:
1218 * 0 = got controlling tty
1219 * 1 = got terminal but no controlling tty
1220 * 2 = cannot find a terminal
1221 * 3 = cannot dup fd
1222 * 4 = cannot make fd close-on-exec
1223 * An existing tty_fd is cached if no "better" one could be found,
1224 * i.e. if tty_devtty was already set or the new would not set it.
1225 */
1226 int
tty_init_fd(void)1227 tty_init_fd(void)
1228 {
1229 int fd, rv, eno = 0;
1230 bool do_close = false, is_devtty = true;
1231
1232 if (tty_devtty) {
1233 /* already got a tty which is /dev/tty */
1234 return (0);
1235 }
1236
1237 #ifdef _UWIN
1238 /*XXX imake style */
1239 if (isatty(3)) {
1240 /* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */
1241 fd = 3;
1242 goto got_fd;
1243 }
1244 #endif
1245 if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) {
1246 do_close = true;
1247 goto got_fd;
1248 }
1249 eno = errno;
1250
1251 if (tty_fd >= 0) {
1252 /* already got a non-devtty one */
1253 rv = 1;
1254 goto out;
1255 }
1256 is_devtty = false;
1257
1258 if (isatty((fd = 0)) || isatty((fd = 2)))
1259 goto got_fd;
1260 /* cannot find one */
1261 rv = 2;
1262 /* assert: do_close == false */
1263 goto out;
1264
1265 got_fd:
1266 if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) {
1267 eno = errno;
1268 rv = 3;
1269 goto out;
1270 }
1271 if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) {
1272 eno = errno;
1273 close(rv);
1274 rv = 4;
1275 goto out;
1276 }
1277 tty_fd = rv;
1278 tty_devtty = is_devtty;
1279 rv = eno = 0;
1280 out:
1281 if (do_close)
1282 close(fd);
1283 errno = eno;
1284 return (rv);
1285 }
1286
1287 /* A shell error occurred (eg, syntax error, etc.) */
1288
1289 #define VWARNINGF_ERRORPREFIX 1
1290 #define VWARNINGF_FILELINE 2
1291 #define VWARNINGF_BUILTIN 4
1292 #define VWARNINGF_INTERNAL 8
1293
1294 static void vwarningf(unsigned int, const char *, va_list)
1295 MKSH_A_FORMAT(__printf__, 2, 0);
1296
1297 static void
vwarningf(unsigned int flags,const char * fmt,va_list ap)1298 vwarningf(unsigned int flags, const char *fmt, va_list ap)
1299 {
1300 if (fmt) {
1301 if (flags & VWARNINGF_INTERNAL)
1302 shf_fprintf(shl_out, Tf_sD_, "internal error");
1303 if (flags & VWARNINGF_ERRORPREFIX)
1304 error_prefix(tobool(flags & VWARNINGF_FILELINE));
1305 if ((flags & VWARNINGF_BUILTIN) &&
1306 /* not set when main() calls parse_args() */
1307 builtin_argv0 && builtin_argv0 != kshname)
1308 shf_fprintf(shl_out, Tf_sD_, builtin_argv0);
1309 shf_vfprintf(shl_out, fmt, ap);
1310 shf_putchar('\n', shl_out);
1311 }
1312 shf_flush(shl_out);
1313 }
1314
1315 void
errorfx(int rc,const char * fmt,...)1316 errorfx(int rc, const char *fmt, ...)
1317 {
1318 va_list va;
1319
1320 exstat = rc;
1321
1322 /* debugging: note that stdout not valid */
1323 shl_stdout_ok = false;
1324
1325 va_start(va, fmt);
1326 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1327 va_end(va);
1328 unwind(LERROR);
1329 }
1330
1331 void
errorf(const char * fmt,...)1332 errorf(const char *fmt, ...)
1333 {
1334 va_list va;
1335
1336 exstat = 1;
1337
1338 /* debugging: note that stdout not valid */
1339 shl_stdout_ok = false;
1340
1341 va_start(va, fmt);
1342 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
1343 va_end(va);
1344 unwind(LERROR);
1345 }
1346
1347 /* like errorf(), but no unwind is done */
1348 void
warningf(bool fileline,const char * fmt,...)1349 warningf(bool fileline, const char *fmt, ...)
1350 {
1351 va_list va;
1352
1353 va_start(va, fmt);
1354 vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0),
1355 fmt, va);
1356 va_end(va);
1357 }
1358
1359 /*
1360 * Used by built-in utilities to prefix shell and utility name to message
1361 * (also unwinds environments for special builtins).
1362 */
1363 void
bi_errorf(const char * fmt,...)1364 bi_errorf(const char *fmt, ...)
1365 {
1366 va_list va;
1367
1368 /* debugging: note that stdout not valid */
1369 shl_stdout_ok = false;
1370
1371 exstat = 1;
1372
1373 va_start(va, fmt);
1374 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1375 VWARNINGF_BUILTIN, fmt, va);
1376 va_end(va);
1377
1378 /* POSIX special builtins cause non-interactive shells to exit */
1379 if (builtin_spec) {
1380 builtin_argv0 = NULL;
1381 /* may not want to use LERROR here */
1382 unwind(LERROR);
1383 }
1384 }
1385
1386 /*
1387 * Used by functions called by builtins and not:
1388 * identical to errorfx if first argument is nil,
1389 * like bi_errorf storing the errorlevel into it otherwise
1390 */
1391 void
maybe_errorf(int * ep,int rc,const char * fmt,...)1392 maybe_errorf(int *ep, int rc, const char *fmt, ...)
1393 {
1394 va_list va;
1395
1396 /* debugging: note that stdout not valid */
1397 shl_stdout_ok = false;
1398
1399 exstat = rc;
1400
1401 va_start(va, fmt);
1402 vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
1403 (ep ? VWARNINGF_BUILTIN : 0), fmt, va);
1404 va_end(va);
1405
1406 if (!ep)
1407 goto and_out;
1408 *ep = rc;
1409
1410 /* POSIX special builtins cause non-interactive shells to exit */
1411 if (builtin_spec) {
1412 builtin_argv0 = NULL;
1413 /* may not want to use LERROR here */
1414 and_out:
1415 unwind(LERROR);
1416 }
1417 }
1418
1419 /* Called when something that shouldn't happen does */
1420 void
internal_errorf(const char * fmt,...)1421 internal_errorf(const char *fmt, ...)
1422 {
1423 va_list va;
1424
1425 va_start(va, fmt);
1426 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1427 va_end(va);
1428 unwind(LERROR);
1429 }
1430
1431 void
internal_warningf(const char * fmt,...)1432 internal_warningf(const char *fmt, ...)
1433 {
1434 va_list va;
1435
1436 va_start(va, fmt);
1437 vwarningf(VWARNINGF_INTERNAL, fmt, va);
1438 va_end(va);
1439 }
1440
1441 /* used by error reporting functions to print "ksh: .kshrc[25]: " */
1442 void
error_prefix(bool fileline)1443 error_prefix(bool fileline)
1444 {
1445 /* Avoid foo: foo[2]: ... */
1446 if (!fileline || !source || !source->file ||
1447 strcmp(source->file, kshname) != 0)
1448 shf_fprintf(shl_out, Tf_sD_, kshname +
1449 (*kshname == '-' ? 1 : 0));
1450 if (fileline && source && source->file != NULL) {
1451 shf_fprintf(shl_out, "%s[%lu]: ", source->file,
1452 (unsigned long)(source->errline ?
1453 source->errline : source->line));
1454 source->errline = 0;
1455 }
1456 }
1457
1458 /* printf to shl_out (stderr) with flush */
1459 void
shellf(const char * fmt,...)1460 shellf(const char *fmt, ...)
1461 {
1462 va_list va;
1463
1464 if (!initio_done)
1465 /* shl_out may not be set up yet... */
1466 return;
1467 va_start(va, fmt);
1468 shf_vfprintf(shl_out, fmt, va);
1469 va_end(va);
1470 shf_flush(shl_out);
1471 }
1472
1473 /* printf to shl_stdout (stdout) */
1474 void
shprintf(const char * fmt,...)1475 shprintf(const char *fmt, ...)
1476 {
1477 va_list va;
1478
1479 if (!shl_stdout_ok)
1480 internal_errorf("shl_stdout not valid");
1481 va_start(va, fmt);
1482 shf_vfprintf(shl_stdout, fmt, va);
1483 va_end(va);
1484 }
1485
1486 /* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
1487 int
can_seek(int fd)1488 can_seek(int fd)
1489 {
1490 struct stat statb;
1491
1492 return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
1493 SHF_UNBUF : 0);
1494 }
1495
1496 #ifdef DF
1497 int shl_dbg_fd;
1498 #define NSHF_IOB 4
1499 #else
1500 #define NSHF_IOB 3
1501 #endif
1502 struct shf shf_iob[NSHF_IOB];
1503
1504 void
initio(void)1505 initio(void)
1506 {
1507 #ifdef DF
1508 const char *lfp;
1509 #endif
1510
1511 /* force buffer allocation */
1512 shf_fdopen(1, SHF_WR, shl_stdout);
1513 shf_fdopen(2, SHF_WR, shl_out);
1514 shf_fdopen(2, SHF_WR, shl_xtrace);
1515 #ifdef DF
1516 if ((lfp = getenv("SDMKSH_PATH")) == NULL) {
1517 if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp))
1518 errorf("can't get home directory");
1519 strpathx(lfp, lfp, "mksh-dbg.txt", 1);
1520 }
1521
1522 if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0)
1523 errorf("can't open debug output file %s", lfp);
1524 if (shl_dbg_fd < FDBASE) {
1525 int nfd;
1526
1527 nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE);
1528 close(shl_dbg_fd);
1529 if ((shl_dbg_fd = nfd) == -1)
1530 errorf("can't dup debug output file");
1531 }
1532 fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC);
1533 shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg);
1534 DF("=== open ===");
1535 #endif
1536 initio_done = true;
1537 }
1538
1539 /* A dup2() with error checking */
1540 int
ksh_dup2(int ofd,int nfd,bool errok)1541 ksh_dup2(int ofd, int nfd, bool errok)
1542 {
1543 int rv;
1544
1545 if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
1546 errorf(Ttoo_many_files);
1547
1548 #ifdef __ultrix
1549 /*XXX imake style */
1550 if (rv >= 0)
1551 fcntl(nfd, F_SETFD, 0);
1552 #endif
1553
1554 return (rv);
1555 }
1556
1557 /*
1558 * Move fd from user space (0 <= fd < 10) to shell space (fd >= 10),
1559 * set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here.
1560 */
1561 short
savefd(int fd)1562 savefd(int fd)
1563 {
1564 int nfd = fd;
1565
1566 if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
1567 (errno == EBADF || errno == EPERM))
1568 return (-1);
1569 if (nfd < 0 || nfd > SHRT_MAX)
1570 errorf(Ttoo_many_files);
1571 fcntl(nfd, F_SETFD, FD_CLOEXEC);
1572 return ((short)nfd);
1573 }
1574
1575 void
restfd(int fd,int ofd)1576 restfd(int fd, int ofd)
1577 {
1578 if (fd == 2)
1579 shf_flush(&shf_iob[/* fd */ 2]);
1580 if (ofd < 0)
1581 /* original fd closed */
1582 close(fd);
1583 else if (fd != ofd) {
1584 /*XXX: what to do if this dup fails? */
1585 ksh_dup2(ofd, fd, true);
1586 close(ofd);
1587 }
1588 }
1589
1590 void
openpipe(int * pv)1591 openpipe(int *pv)
1592 {
1593 int lpv[2];
1594
1595 if (pipe(lpv) < 0)
1596 errorf("can't create pipe - try again");
1597 pv[0] = savefd(lpv[0]);
1598 if (pv[0] != lpv[0])
1599 close(lpv[0]);
1600 pv[1] = savefd(lpv[1]);
1601 if (pv[1] != lpv[1])
1602 close(lpv[1]);
1603 #ifdef __OS2__
1604 setmode(pv[0], O_BINARY);
1605 setmode(pv[1], O_BINARY);
1606 #endif
1607 }
1608
1609 void
closepipe(int * pv)1610 closepipe(int *pv)
1611 {
1612 close(pv[0]);
1613 close(pv[1]);
1614 }
1615
1616 /*
1617 * Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
1618 * a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
1619 */
1620 int
check_fd(const char * name,int mode,const char ** emsgp)1621 check_fd(const char *name, int mode, const char **emsgp)
1622 {
1623 int fd, fl;
1624
1625 if (!name[0] || name[1])
1626 goto illegal_fd_name;
1627 if (name[0] == 'p')
1628 return (coproc_getfd(mode, emsgp));
1629 if (!ctype(name[0], C_DIGIT)) {
1630 illegal_fd_name:
1631 if (emsgp)
1632 *emsgp = "illegal file descriptor name";
1633 return (-1);
1634 }
1635
1636 if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) {
1637 if (emsgp)
1638 *emsgp = "bad file descriptor";
1639 return (-1);
1640 }
1641 fl &= O_ACCMODE;
1642 /*
1643 * X_OK is a kludge to disable this check for dups (x<&1):
1644 * historical shells never did this check (XXX don't know what
1645 * POSIX has to say).
1646 */
1647 if (!(mode & X_OK) && fl != O_RDWR && (
1648 ((mode & R_OK) && fl != O_RDONLY) ||
1649 ((mode & W_OK) && fl != O_WRONLY))) {
1650 if (emsgp)
1651 *emsgp = (fl == O_WRONLY) ?
1652 "fd not open for reading" :
1653 "fd not open for writing";
1654 return (-1);
1655 }
1656 return (fd);
1657 }
1658
1659 /* Called once from main */
1660 void
coproc_init(void)1661 coproc_init(void)
1662 {
1663 coproc.read = coproc.readw = coproc.write = -1;
1664 coproc.njobs = 0;
1665 coproc.id = 0;
1666 }
1667
1668 /* Called by c_read() when eof is read - close fd if it is the co-process fd */
1669 void
coproc_read_close(int fd)1670 coproc_read_close(int fd)
1671 {
1672 if (coproc.read >= 0 && fd == coproc.read) {
1673 coproc_readw_close(fd);
1674 close(coproc.read);
1675 coproc.read = -1;
1676 }
1677 }
1678
1679 /*
1680 * Called by c_read() and by iosetup() to close the other side of the
1681 * read pipe, so reads will actually terminate.
1682 */
1683 void
coproc_readw_close(int fd)1684 coproc_readw_close(int fd)
1685 {
1686 if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
1687 close(coproc.readw);
1688 coproc.readw = -1;
1689 }
1690 }
1691
1692 /*
1693 * Called by c_print when a write to a fd fails with EPIPE and by iosetup
1694 * when co-process input is dup'd
1695 */
1696 void
coproc_write_close(int fd)1697 coproc_write_close(int fd)
1698 {
1699 if (coproc.write >= 0 && fd == coproc.write) {
1700 close(coproc.write);
1701 coproc.write = -1;
1702 }
1703 }
1704
1705 /*
1706 * Called to check for existence of/value of the co-process file descriptor.
1707 * (Used by check_fd() and by c_read/c_print to deal with -p option).
1708 */
1709 int
coproc_getfd(int mode,const char ** emsgp)1710 coproc_getfd(int mode, const char **emsgp)
1711 {
1712 int fd = (mode & R_OK) ? coproc.read : coproc.write;
1713
1714 if (fd >= 0)
1715 return (fd);
1716 if (emsgp)
1717 *emsgp = "no coprocess";
1718 return (-1);
1719 }
1720
1721 /*
1722 * called to close file descriptors related to the coprocess (if any)
1723 * Should be called with SIGCHLD blocked.
1724 */
1725 void
coproc_cleanup(int reuse)1726 coproc_cleanup(int reuse)
1727 {
1728 /* This to allow co-processes to share output pipe */
1729 if (!reuse || coproc.readw < 0 || coproc.read < 0) {
1730 if (coproc.read >= 0) {
1731 close(coproc.read);
1732 coproc.read = -1;
1733 }
1734 if (coproc.readw >= 0) {
1735 close(coproc.readw);
1736 coproc.readw = -1;
1737 }
1738 }
1739 if (coproc.write >= 0) {
1740 close(coproc.write);
1741 coproc.write = -1;
1742 }
1743 }
1744
1745 struct temp *
maketemp(Area * ap,Temp_type type,struct temp ** tlist)1746 maketemp(Area *ap, Temp_type type, struct temp **tlist)
1747 {
1748 char *cp;
1749 size_t len;
1750 int i, j;
1751 struct temp *tp;
1752 const char *dir;
1753 struct stat sb;
1754
1755 dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
1756 /* add "/shXXXXXX.tmp" plus NUL */
1757 len = strlen(dir);
1758 checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
1759 tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
1760
1761 tp->shf = NULL;
1762 tp->pid = procpid;
1763 tp->type = type;
1764
1765 if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
1766 tp->tffn[0] = '\0';
1767 goto maketemp_out;
1768 }
1769
1770 cp = (void *)tp;
1771 cp += offsetof(struct temp, tffn[0]);
1772 memcpy(cp, dir, len);
1773 cp += len;
1774 memcpy(cp, "/shXXXXXX.tmp", 14);
1775 /* point to the first of six Xes */
1776 cp += 3;
1777
1778 /* cyclically attempt to open a temporary file */
1779 do {
1780 /* generate random part of filename */
1781 len = 0;
1782 do {
1783 cp[len++] = digits_lc[rndget() % 36];
1784 } while (len < 6);
1785
1786 /* check if this one works */
1787 if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR,
1788 0600)) < 0 && errno != EEXIST)
1789 goto maketemp_out;
1790 } while (i < 0);
1791
1792 if (type == TT_FUNSUB) {
1793 /* map us high and mark as close-on-exec */
1794 if ((j = savefd(i)) != i) {
1795 close(i);
1796 i = j;
1797 }
1798
1799 /* operation mode for the shf */
1800 j = SHF_RD;
1801 } else
1802 j = SHF_WR;
1803
1804 /* shf_fdopen cannot fail, so no fd leak */
1805 tp->shf = shf_fdopen(i, j, NULL);
1806
1807 maketemp_out:
1808 tp->next = *tlist;
1809 *tlist = tp;
1810 return (tp);
1811 }
1812
1813 /*
1814 * We use a similar collision resolution algorithm as Python 2.5.4
1815 * but with a slightly tweaked implementation written from scratch.
1816 */
1817
1818 #define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */
1819 #define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
1820
1821 static void tgrow(struct table *);
1822 static int tnamecmp(const void *, const void *);
1823
1824 static void
tgrow(struct table * tp)1825 tgrow(struct table *tp)
1826 {
1827 size_t i, j, osize, mask, perturb;
1828 struct tbl *tblp, **pp;
1829 struct tbl **ntblp, **otblp = tp->tbls;
1830
1831 if (tp->tshift > 29)
1832 internal_errorf("hash table size limit reached");
1833
1834 /* calculate old size, new shift and new size */
1835 osize = (size_t)1 << (tp->tshift++);
1836 i = osize << 1;
1837
1838 ntblp = alloc2(i, sizeof(struct tbl *), tp->areap);
1839 /* multiplication cannot overflow: alloc2 checked that */
1840 memset(ntblp, 0, i * sizeof(struct tbl *));
1841
1842 /* table can get very full when reaching its size limit */
1843 tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL :
1844 /* but otherwise, only 75% */
1845 ((i * 3) / 4);
1846 tp->tbls = ntblp;
1847 if (otblp == NULL)
1848 return;
1849
1850 mask = i - 1;
1851 for (i = 0; i < osize; i++)
1852 if ((tblp = otblp[i]) != NULL) {
1853 if ((tblp->flag & DEFINED)) {
1854 /* search for free hash table slot */
1855 j = perturb = tblp->ua.hval;
1856 goto find_first_empty_slot;
1857 find_next_empty_slot:
1858 j = (j << 2) + j + perturb + 1;
1859 perturb >>= PERTURB_SHIFT;
1860 find_first_empty_slot:
1861 pp = &ntblp[j & mask];
1862 if (*pp != NULL)
1863 goto find_next_empty_slot;
1864 /* found an empty hash table slot */
1865 *pp = tblp;
1866 tp->nfree--;
1867 } else if (!(tblp->flag & FINUSE)) {
1868 afree(tblp, tp->areap);
1869 }
1870 }
1871 afree(otblp, tp->areap);
1872 }
1873
1874 void
ktinit(Area * ap,struct table * tp,uint8_t initshift)1875 ktinit(Area *ap, struct table *tp, uint8_t initshift)
1876 {
1877 tp->areap = ap;
1878 tp->tbls = NULL;
1879 tp->tshift = ((initshift > INIT_TBLSHIFT) ?
1880 initshift : INIT_TBLSHIFT) - 1;
1881 tgrow(tp);
1882 }
1883
1884 /* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
1885 struct tbl *
ktscan(struct table * tp,const char * name,uint32_t h,struct tbl *** ppp)1886 ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
1887 {
1888 size_t j, perturb, mask;
1889 struct tbl **pp, *p;
1890
1891 mask = ((size_t)1 << (tp->tshift)) - 1;
1892 /* search for hash table slot matching name */
1893 j = perturb = h;
1894 goto find_first_slot;
1895 find_next_slot:
1896 j = (j << 2) + j + perturb + 1;
1897 perturb >>= PERTURB_SHIFT;
1898 find_first_slot:
1899 pp = &tp->tbls[j & mask];
1900 if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
1901 strcmp(p->name, name)))
1902 goto find_next_slot;
1903 /* p == NULL if not found, correct found entry otherwise */
1904 if (ppp)
1905 *ppp = pp;
1906 return (p);
1907 }
1908
1909 /* table, name (key) to enter, hash(n) */
1910 struct tbl *
ktenter(struct table * tp,const char * n,uint32_t h)1911 ktenter(struct table *tp, const char *n, uint32_t h)
1912 {
1913 struct tbl **pp, *p;
1914 size_t len;
1915
1916 Search:
1917 if ((p = ktscan(tp, n, h, &pp)))
1918 return (p);
1919
1920 if (tp->nfree == 0) {
1921 /* too full */
1922 tgrow(tp);
1923 goto Search;
1924 }
1925
1926 /* create new tbl entry */
1927 len = strlen(n);
1928 checkoktoadd(len, offsetof(struct tbl, name[0]) + 1);
1929 p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap);
1930 p->flag = 0;
1931 p->type = 0;
1932 p->areap = tp->areap;
1933 p->ua.hval = h;
1934 p->u2.field = 0;
1935 p->u.array = NULL;
1936 memcpy(p->name, n, len);
1937
1938 /* enter in tp->tbls */
1939 tp->nfree--;
1940 *pp = p;
1941 return (p);
1942 }
1943
1944 void
ktwalk(struct tstate * ts,struct table * tp)1945 ktwalk(struct tstate *ts, struct table *tp)
1946 {
1947 ts->left = (size_t)1 << (tp->tshift);
1948 ts->next = tp->tbls;
1949 }
1950
1951 struct tbl *
ktnext(struct tstate * ts)1952 ktnext(struct tstate *ts)
1953 {
1954 while (--ts->left >= 0) {
1955 struct tbl *p = *ts->next++;
1956 if (p != NULL && (p->flag & DEFINED))
1957 return (p);
1958 }
1959 return (NULL);
1960 }
1961
1962 static int
tnamecmp(const void * p1,const void * p2)1963 tnamecmp(const void *p1, const void *p2)
1964 {
1965 const struct tbl *a = *((const struct tbl * const *)p1);
1966 const struct tbl *b = *((const struct tbl * const *)p2);
1967
1968 return (ascstrcmp(a->name, b->name));
1969 }
1970
1971 struct tbl **
ktsort(struct table * tp)1972 ktsort(struct table *tp)
1973 {
1974 size_t i;
1975 struct tbl **p, **sp, **dp;
1976
1977 /*
1978 * since the table is never entirely full, no need to reserve
1979 * additional space for the trailing NULL appended below
1980 */
1981 i = (size_t)1 << (tp->tshift);
1982 p = alloc2(i, sizeof(struct tbl *), ATEMP);
1983 sp = tp->tbls; /* source */
1984 dp = p; /* dest */
1985 while (i--)
1986 if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
1987 ((*dp)->flag & ARRAY)))
1988 dp++;
1989 qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp);
1990 p[i] = NULL;
1991 return (p);
1992 }
1993
1994 #ifdef SIGWINCH
1995 static void
x_sigwinch(int sig MKSH_A_UNUSED)1996 x_sigwinch(int sig MKSH_A_UNUSED)
1997 {
1998 /* this runs inside interrupt context, with errno saved */
1999
2000 got_winch = 1;
2001 }
2002 #endif
2003
2004 #ifdef DF
2005 void
DF(const char * fmt,...)2006 DF(const char *fmt, ...)
2007 {
2008 va_list args;
2009 struct timeval tv;
2010 mirtime_mjd mjd;
2011
2012 mksh_lockfd(shl_dbg_fd);
2013 mksh_TIME(tv);
2014 timet2mjd(&mjd, tv.tv_sec);
2015 shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ",
2016 (unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60,
2017 (unsigned)mjd.sec % 60, (unsigned)getpid(),
2018 (unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
2019 va_start(args, fmt);
2020 shf_vfprintf(shl_dbg, fmt, args);
2021 va_end(args);
2022 shf_putc('\n', shl_dbg);
2023 shf_flush(shl_dbg);
2024 mksh_unlkfd(shl_dbg_fd);
2025 }
2026 #endif
2027
2028 void
x_mkraw(int fd,mksh_ttyst * ocb,bool forread)2029 x_mkraw(int fd, mksh_ttyst *ocb, bool forread)
2030 {
2031 mksh_ttyst cb;
2032
2033 if (ocb)
2034 mksh_tcget(fd, ocb);
2035 else
2036 ocb = &tty_state;
2037
2038 cb = *ocb;
2039 if (forread) {
2040 cb.c_iflag &= ~(ISTRIP);
2041 cb.c_lflag &= ~(ICANON) | ECHO;
2042 } else {
2043 cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP);
2044 cb.c_lflag &= ~(ISIG | ICANON | ECHO);
2045 }
2046 #if defined(VLNEXT) && defined(_POSIX_VDISABLE)
2047 /* OSF/1 processes lnext when ~icanon */
2048 cb.c_cc[VLNEXT] = _POSIX_VDISABLE;
2049 #endif
2050 /* SunOS 4.1.x and OSF/1 process discard(flush) when ~icanon */
2051 #if defined(VDISCARD) && defined(_POSIX_VDISABLE)
2052 cb.c_cc[VDISCARD] = _POSIX_VDISABLE;
2053 #endif
2054 cb.c_cc[VTIME] = 0;
2055 cb.c_cc[VMIN] = 1;
2056
2057 mksh_tcset(fd, &cb);
2058 }
2059
2060 #ifdef MKSH_ENVDIR
2061 static void
init_environ(void)2062 init_environ(void)
2063 {
2064 char *xp;
2065 ssize_t n;
2066 XString xs;
2067 struct shf *shf;
2068 DIR *dirp;
2069 struct dirent *dent;
2070
2071 if ((dirp = opendir(MKSH_ENVDIR)) == NULL) {
2072 warningf(false, "cannot read environment from %s: %s",
2073 MKSH_ENVDIR, cstrerror(errno));
2074 return;
2075 }
2076 XinitN(xs, 256, ATEMP);
2077 read_envfile:
2078 errno = 0;
2079 if ((dent = readdir(dirp)) != NULL) {
2080 if (skip_varname(dent->d_name, true)[0] == '\0') {
2081 strpathx(xp, MKSH_ENVDIR, dent->d_name, 1);
2082 if (!(shf = shf_open(xp, O_RDONLY, 0, 0))) {
2083 warningf(false,
2084 "cannot read environment %s from %s: %s",
2085 dent->d_name, MKSH_ENVDIR,
2086 cstrerror(errno));
2087 goto read_envfile;
2088 }
2089 afree(xp, ATEMP);
2090 n = strlen(dent->d_name);
2091 xp = Xstring(xs, xp);
2092 XcheckN(xs, xp, n + 32);
2093 memcpy(xp, dent->d_name, n);
2094 xp += n;
2095 *xp++ = '=';
2096 while ((n = shf_read(xp, Xnleft(xs, xp), shf)) > 0) {
2097 xp += n;
2098 if (Xnleft(xs, xp) <= 0)
2099 XcheckN(xs, xp, Xlength(xs, xp));
2100 }
2101 if (n < 0) {
2102 warningf(false,
2103 "cannot read environment %s from %s: %s",
2104 dent->d_name, MKSH_ENVDIR,
2105 cstrerror(shf_errno(shf)));
2106 } else {
2107 *xp = '\0';
2108 xp = Xstring(xs, xp);
2109 rndpush(xp);
2110 typeset(xp, IMPORT | EXPORT, 0, 0, 0);
2111 }
2112 shf_close(shf);
2113 }
2114 goto read_envfile;
2115 } else if (errno)
2116 warningf(false, "cannot read environment from %s: %s",
2117 MKSH_ENVDIR, cstrerror(errno));
2118 closedir(dirp);
2119 Xfree(xs, xp);
2120 }
2121 #else
2122 extern char **environ;
2123
2124 static void
init_environ(void)2125 init_environ(void)
2126 {
2127 const char **wp;
2128
2129 if (environ == NULL)
2130 return;
2131
2132 wp = (const char **)environ;
2133 while (*wp != NULL) {
2134 rndpush(*wp);
2135 typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
2136 ++wp;
2137 }
2138 }
2139 #endif
2140
2141 #ifdef MKSH_EARLY_LOCALE_TRACKING
2142 void
recheck_ctype(void)2143 recheck_ctype(void)
2144 {
2145 const char *ccp;
2146 uint8_t old_utfmode = UTFMODE;
2147
2148 ccp = str_val(global("LC_ALL"));
2149 if (ccp == null)
2150 ccp = str_val(global("LC_CTYPE"));
2151 if (ccp == null)
2152 ccp = str_val(global("LANG"));
2153 UTFMODE = isuc(ccp);
2154 #if HAVE_SETLOCALE_CTYPE
2155 ccp = setlocale(LC_CTYPE, ccp);
2156 #if HAVE_LANGINFO_CODESET
2157 if (!isuc(ccp))
2158 ccp = nl_langinfo(CODESET);
2159 #endif
2160 if (isuc(ccp))
2161 UTFMODE = 1;
2162 #endif
2163
2164 if (Flag(FPOSIX) && UTFMODE && !old_utfmode)
2165 warningf(true, "early locale tracking enabled UTF-8 mode while in POSIX mode, you are now noncompliant");
2166 }
2167 #endif
2168