1 /* system-dependent definitions for coreutils
2 Copyright (C) 1989-2023 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 /* Include this file _after_ system headers if possible. */
18
19 #include <attribute.h>
20
21 #include <alloca.h>
22
23 #include <sys/stat.h>
24
25 /* Commonly used file permission combination. */
26 #define MODE_RW_UGO (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
27
28 #if HAVE_SYS_PARAM_H
29 # include <sys/param.h>
30 #endif
31
32 #include <unistd.h>
33
34 #include <limits.h>
35
36 #include "pathmax.h"
37 #ifndef PATH_MAX
38 # define PATH_MAX 8192
39 #endif
40
41 #include "configmake.h"
42
43 #include <sys/time.h>
44 #include <time.h>
45
46 /* Since major is a function on SVR4, we can't use 'ifndef major'. */
47 #if MAJOR_IN_MKDEV
48 # include <sys/mkdev.h>
49 # define HAVE_MAJOR
50 #endif
51 #if MAJOR_IN_SYSMACROS
52 # include <sys/sysmacros.h>
53 # define HAVE_MAJOR
54 #endif
55 #ifdef major /* Might be defined in sys/types.h. */
56 # define HAVE_MAJOR
57 #endif
58
59 #ifndef HAVE_MAJOR
60 # define major(dev) (((dev) >> 8) & 0xff)
61 # define minor(dev) ((dev) & 0xff)
62 # define makedev(maj, min) (((maj) << 8) | (min))
63 #endif
64 #undef HAVE_MAJOR
65
66 #if ! defined makedev && defined mkdev
67 # define makedev(maj, min) mkdev (maj, min)
68 #endif
69
70 #include <stddef.h>
71 #include <string.h>
72 #include <errno.h>
73
74 /* Some systems don't define this; POSIX mentions it but says it is
75 obsolete. gnulib defines it, but only on native Windows systems,
76 and there only because MSVC 10 does. */
77 #ifndef ENODATA
78 # define ENODATA (-1)
79 #endif
80
81 #include <stdlib.h>
82 #include "version.h"
83
84 /* Exit statuses for programs like 'env' that exec other programs. */
85 enum
86 {
87 EXIT_TIMEDOUT = 124, /* Time expired before child completed. */
88 EXIT_CANCELED = 125, /* Internal error prior to exec attempt. */
89 EXIT_CANNOT_INVOKE = 126, /* Program located, but not usable. */
90 EXIT_ENOENT = 127 /* Could not find program to exec. */
91 };
92
93 #include "exitfail.h"
94
95 /* Set exit_failure to STATUS if that's not the default already. */
96 static inline void
97 initialize_exit_failure (int status)
98 {
99 if (status != EXIT_FAILURE)
100 exit_failure = status;
101 }
102
103 #include <fcntl.h>
104 #ifdef O_PATH
105 enum { O_PATHSEARCH = O_PATH };
106 #else
107 enum { O_PATHSEARCH = O_SEARCH };
108 #endif
109
110 #include <dirent.h>
111 #ifndef _D_EXACT_NAMLEN
112 # define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
113 #endif
114
115 enum
116 {
117 NOT_AN_INODE_NUMBER = 0
118 };
119
120 #ifdef D_INO_IN_DIRENT
121 # define D_INO(dp) (dp)->d_ino
122 #else
123 /* Some systems don't have inodes, so fake them to avoid lots of ifdefs. */
124 # define D_INO(dp) NOT_AN_INODE_NUMBER
125 #endif
126
127 /* include here for SIZE_MAX. */
128 #include <inttypes.h>
129
130 /* Redirection and wildcarding when done by the utility itself.
131 Generally a noop, but used in particular for OS/2. */
132 #ifndef initialize_main
133 # ifndef __OS2__
134 # define initialize_main(ac, av)
135 # else
136 # define initialize_main(ac, av) \
137 do { _wildcard (ac, av); _response (ac, av); } while (0)
138 # endif
139 #endif
140
141 #include "stat-macros.h"
142
143 #include "timespec.h"
144
145 #include <ctype.h>
146
147 /* ISDIGIT differs from isdigit, as follows:
148 - Its arg may be any int or unsigned int; it need not be an unsigned char
149 or EOF.
150 - It's typically faster.
151 POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
152 isdigit unless it's important to use the locale's definition
153 of 'digit' even when the host does not conform to POSIX. */
154 #define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
155
156 /* Convert a possibly-signed character to an unsigned character. This is
157 a bit safer than casting to unsigned char, since it catches some type
158 errors that the cast doesn't. */
159 static inline unsigned char to_uchar (char ch) { return ch; }
160
161 /* '\n' is considered a field separator with --zero-terminated. */
162 static inline bool
163 field_sep (unsigned char ch)
164 {
165 return isblank (ch) || ch == '\n';
166 }
167
168 #include <locale.h>
169
170 /* Take care of NLS matters. */
171
172 #include "gettext.h"
173 #if ! ENABLE_NLS
174 # undef textdomain
175 # define textdomain(Domainname) /* empty */
176 # undef bindtextdomain
177 # define bindtextdomain(Domainname, Dirname) /* empty */
178 #endif
179
180 #define _(msgid) gettext (msgid)
181 #define N_(msgid) msgid
182
183 /* Return a value that pluralizes the same way that N does, in all
184 languages we know of. */
185 static inline unsigned long int
186 select_plural (uintmax_t n)
187 {
188 /* Reduce by a power of ten, but keep it away from zero. The
189 gettext manual says 1000000 should be safe. */
190 enum { PLURAL_REDUCER = 1000000 };
191 return (n <= ULONG_MAX ? n : n % PLURAL_REDUCER + PLURAL_REDUCER);
192 }
193
194 #define STREQ(a, b) (strcmp (a, b) == 0)
195 #define STREQ_LEN(a, b, n) (strncmp (a, b, n) == 0) /* n==-1 means unbounded */
196 #define STRPREFIX(a, b) (strncmp (a, b, strlen (b)) == 0)
197
198 /* Just like strncmp, but the second argument must be a literal string
199 and you don't specify the length; that comes from the literal. */
200 #define STRNCMP_LIT(s, lit) strncmp (s, "" lit "", sizeof (lit) - 1)
201
202 #if !HAVE_DECL_GETLOGIN
203 char *getlogin (void);
204 #endif
205
206 #if !HAVE_DECL_TTYNAME
207 char *ttyname (int);
208 #endif
209
210 #if !HAVE_DECL_GETEUID
211 uid_t geteuid (void);
212 #endif
213
214 #if !HAVE_DECL_GETPWUID
215 struct passwd *getpwuid (uid_t);
216 #endif
217
218 #if !HAVE_DECL_GETGRGID
219 struct group *getgrgid (gid_t);
220 #endif
221
222 /* Interix has replacements for getgr{gid,nam,ent}, that don't
223 query the domain controller for group members when not required.
224 This speeds up the calls tremendously (<1 ms vs. >3 s). */
225 /* To protect any system that could provide _nomembers functions
226 other than interix, check for HAVE_SETGROUPS, as interix is
227 one of the very few (the only?) platform that lacks it */
228 #if ! HAVE_SETGROUPS
229 # if HAVE_GETGRGID_NOMEMBERS
230 # define getgrgid(gid) getgrgid_nomembers(gid)
231 # endif
232 # if HAVE_GETGRNAM_NOMEMBERS
233 # define getgrnam(nam) getgrnam_nomembers(nam)
234 # endif
235 # if HAVE_GETGRENT_NOMEMBERS
236 # define getgrent() getgrent_nomembers()
237 # endif
238 #endif
239
240 #if !HAVE_DECL_GETUID
241 uid_t getuid (void);
242 #endif
243
244 #include "idx.h"
245 #include "xalloc.h"
246 #include "verify.h"
247
248 /* This is simply a shorthand for the common case in which
249 the third argument to x2nrealloc would be 'sizeof *(P)'.
250 Ensure that sizeof *(P) is *not* 1. In that case, it'd be
251 better to use X2REALLOC, although not strictly necessary. */
252 #define X2NREALLOC(P, PN) verify_expr (sizeof *(P) != 1, \
253 x2nrealloc (P, PN, sizeof *(P)))
254
255 /* Using x2realloc (when appropriate) usually makes your code more
256 readable than using x2nrealloc, but it also makes it so your
257 code will malfunction if sizeof *(P) ever becomes 2 or greater.
258 So use this macro instead of using x2realloc directly. */
259 #define X2REALLOC(P, PN) verify_expr (sizeof *(P) == 1, \
260 x2realloc (P, PN))
261
262 #include "unlocked-io.h"
263 #include "same-inode.h"
264
265 #include "dirname.h"
266 #include "openat.h"
267
268 static inline bool
269 dot_or_dotdot (char const *file_name)
270 {
271 if (file_name[0] == '.')
272 {
273 char sep = file_name[(file_name[1] == '.') + 1];
274 return (! sep || ISSLASH (sep));
275 }
276 else
277 return false;
278 }
279
280 /* A wrapper for readdir so that callers don't see entries for '.' or '..'. */
281 static inline struct dirent const *
282 readdir_ignoring_dot_and_dotdot (DIR *dirp)
283 {
284 while (true)
285 {
286 struct dirent const *dp = readdir (dirp);
287 if (dp == nullptr || ! dot_or_dotdot (dp->d_name))
288 return dp;
289 }
290 }
291
292 /* Return -1 if DIR is an empty directory,
293 0 if DIR is a nonempty directory,
294 and a positive error number if there was trouble determining
295 whether DIR is an empty or nonempty directory. */
296 enum {
297 DS_UNKNOWN = -2,
298 DS_EMPTY = -1,
299 DS_NONEMPTY = 0,
300 };
301 static inline int
302 directory_status (int fd_cwd, char const *dir)
303 {
304 DIR *dirp;
305 bool no_direntries;
306 int saved_errno;
307 int fd = openat (fd_cwd, dir,
308 (O_RDONLY | O_DIRECTORY
309 | O_NOCTTY | O_NOFOLLOW | O_NONBLOCK));
310
311 if (fd < 0)
312 return errno;
313
314 dirp = fdopendir (fd);
315 if (dirp == nullptr)
316 {
317 saved_errno = errno;
318 close (fd);
319 return saved_errno;
320 }
321
322 errno = 0;
323 no_direntries = !readdir_ignoring_dot_and_dotdot (dirp);
324 saved_errno = errno;
325 closedir (dirp);
326 return no_direntries && saved_errno == 0 ? DS_EMPTY : saved_errno;
327 }
328
329 /* Factor out some of the common --help and --version processing code. */
330
331 /* These enum values cannot possibly conflict with the option values
332 ordinarily used by commands, including CHAR_MAX + 1, etc. Avoid
333 CHAR_MIN - 1, as it may equal -1, the getopt end-of-options value. */
334 enum
335 {
336 GETOPT_HELP_CHAR = (CHAR_MIN - 2),
337 GETOPT_VERSION_CHAR = (CHAR_MIN - 3)
338 };
339
340 #define GETOPT_HELP_OPTION_DECL \
341 "help", no_argument, nullptr, GETOPT_HELP_CHAR
342 #define GETOPT_VERSION_OPTION_DECL \
343 "version", no_argument, nullptr, GETOPT_VERSION_CHAR
344 #define GETOPT_SELINUX_CONTEXT_OPTION_DECL \
345 "context", optional_argument, nullptr, 'Z'
346
347 #define case_GETOPT_HELP_CHAR \
348 case GETOPT_HELP_CHAR: \
349 usage (EXIT_SUCCESS); \
350 break;
351
352 /* Program_name must be a literal string.
353 Usually it is just PROGRAM_NAME. */
354 #define USAGE_BUILTIN_WARNING \
355 _("\n" \
356 "NOTE: your shell may have its own version of %s, which usually supersedes\n" \
357 "the version described here. Please refer to your shell's documentation\n" \
358 "for details about the options it supports.\n")
359
360 #define HELP_OPTION_DESCRIPTION \
361 _(" --help display this help and exit\n")
362 #define VERSION_OPTION_DESCRIPTION \
363 _(" --version output version information and exit\n")
364
365 #include "closein.h"
366 #include "closeout.h"
367
368 #define emit_bug_reporting_address unused__emit_bug_reporting_address
369 #include "version-etc.h"
370 #undef emit_bug_reporting_address
371
372 #include "propername.h"
373 /* Define away proper_name, since it's not worth the cost of adding ~17KB to
374 the x86_64 text size of every single program. This avoids a 40%
375 (almost ~2MB) increase in the file system space utilization for the set
376 of the 100 binaries. */
377 #define proper_name(x) proper_name_lite (x, x)
378
379 #include "progname.h"
380
381 #define case_GETOPT_VERSION_CHAR(Program_name, Authors) \
382 case GETOPT_VERSION_CHAR: \
383 version_etc (stdout, Program_name, PACKAGE_NAME, Version, Authors, \
384 (char *) nullptr); \
385 exit (EXIT_SUCCESS); \
386 break;
387
388 #include "minmax.h"
389 #include "intprops.h"
390
391 #ifndef SSIZE_MAX
392 # define SSIZE_MAX TYPE_MAXIMUM (ssize_t)
393 #endif
394
395 #ifndef OFF_T_MIN
396 # define OFF_T_MIN TYPE_MINIMUM (off_t)
397 #endif
398
399 #ifndef OFF_T_MAX
400 # define OFF_T_MAX TYPE_MAXIMUM (off_t)
401 #endif
402
403 #ifndef UID_T_MAX
404 # define UID_T_MAX TYPE_MAXIMUM (uid_t)
405 #endif
406
407 #ifndef GID_T_MAX
408 # define GID_T_MAX TYPE_MAXIMUM (gid_t)
409 #endif
410
411 #ifndef PID_T_MAX
412 # define PID_T_MAX TYPE_MAXIMUM (pid_t)
413 #endif
414
415 /* Use this to suppress gcc warnings. */
416 #ifdef lint
417 # define IF_LINT(Code) Code
418 #else
419 # define IF_LINT(Code) /* empty */
420 #endif
421
422 /* main_exit should be called only from the main function. It is
423 equivalent to 'exit'. When checking for lint it calls 'exit', to
424 pacify gcc -fsanitize=lint which would otherwise have false alarms
425 for pointers in the main function's activation record. Otherwise
426 it simply returns from 'main'; this used to be what gcc's static
427 checking preferred and may yet be again. */
428 #ifdef lint
429 # define main_exit(status) exit (status)
430 #else
431 # define main_exit(status) return status
432 #endif
433
434 #ifdef __GNUC__
435 # define LIKELY(cond) __builtin_expect ((cond), 1)
436 # define UNLIKELY(cond) __builtin_expect ((cond), 0)
437 #else
438 # define LIKELY(cond) (cond)
439 # define UNLIKELY(cond) (cond)
440 #endif
441
442
443 #if defined strdupa
444 # define ASSIGN_STRDUPA(DEST, S) \
445 do { DEST = strdupa (S); } while (0)
446 #else
447 # define ASSIGN_STRDUPA(DEST, S) \
448 do \
449 { \
450 char const *s_ = (S); \
451 size_t len_ = strlen (s_) + 1; \
452 char *tmp_dest_ = alloca (len_); \
453 DEST = memcpy (tmp_dest_, s_, len_); \
454 } \
455 while (0)
456 #endif
457
458 #if ! HAVE_SYNC
459 # define sync() /* empty */
460 #endif
461
462 /* Compute the greatest common divisor of U and V using Euclid's
463 algorithm. U and V must be nonzero. */
464
465 ATTRIBUTE_CONST
466 static inline size_t
467 gcd (size_t u, size_t v)
468 {
469 do
470 {
471 size_t t = u % v;
472 u = v;
473 v = t;
474 }
475 while (v);
476
477 return u;
478 }
479
480 /* Compute the least common multiple of U and V. U and V must be
481 nonzero. There is no overflow checking, so callers should not
482 specify outlandish sizes. */
483
484 ATTRIBUTE_CONST
485 static inline size_t
486 lcm (size_t u, size_t v)
487 {
488 return u * (v / gcd (u, v));
489 }
490
491 /* Return PTR, aligned upward to the next multiple of ALIGNMENT.
492 ALIGNMENT must be nonzero. The caller must arrange for ((char *)
493 PTR) through ((char *) PTR + ALIGNMENT - 1) to be addressable
494 locations. */
495
496 static inline void *
497 ptr_align (void const *ptr, size_t alignment)
498 {
499 char const *p0 = ptr;
500 char const *p1 = p0 + alignment - 1;
501 return (void *) (p1 - (size_t) p1 % alignment);
502 }
503
504 /* Return whether the buffer consists entirely of NULs.
505 Based on memeqzero in CCAN by Rusty Russell under CC0 (Public domain). */
506
507 ATTRIBUTE_PURE
508 static inline bool
509 is_nul (void const *buf, size_t length)
510 {
511 const unsigned char *p = buf;
512 /* Using possibly unaligned access for the first 16 bytes
513 saves about 30-40 cycles, though it is strictly undefined behavior
514 and so would need __attribute__ ((__no_sanitize_undefined__))
515 to avoid -fsanitize=undefined warnings.
516 Considering coreutils is mainly concerned with relatively
517 large buffers, we'll just use the defined behavior. */
518 #if 0 && (_STRING_ARCH_unaligned || _STRING_INLINE_unaligned)
519 unsigned long word;
520 #else
521 unsigned char word;
522 #endif
523
524 if (! length)
525 return true;
526
527 /* Check len bytes not aligned on a word. */
528 while (UNLIKELY (length & (sizeof word - 1)))
529 {
530 if (*p)
531 return false;
532 p++;
533 length--;
534 if (! length)
535 return true;
536 }
537
538 /* Check up to 16 bytes a word at a time. */
539 for (;;)
540 {
541 memcpy (&word, p, sizeof word);
542 if (word)
543 return false;
544 p += sizeof word;
545 length -= sizeof word;
546 if (! length)
547 return true;
548 if (UNLIKELY (length & 15) == 0)
549 break;
550 }
551
552 /* Now we know first 16 bytes are NUL, memcmp with self. */
553 return memcmp (buf, p, length) == 0;
554 }
555
556 /* If 10*Accum + Digit_val is larger than the maximum value for Type,
557 then don't update Accum and return false to indicate it would
558 overflow. Otherwise, set Accum to that new value and return true.
559 Verify at compile-time that Type is Accum's type, and that Type is
560 unsigned. Accum must be an object, so that we can take its
561 address. Accum and Digit_val may be evaluated multiple times.
562
563 The "Added check" below is not strictly required, but it causes GCC
564 to return a nonzero exit status instead of merely a warning
565 diagnostic, and that is more useful. */
566
567 #define DECIMAL_DIGIT_ACCUMULATE(Accum, Digit_val, Type) \
568 ( \
569 (void) (&(Accum) == (Type *) nullptr), /* The type matches. */ \
570 verify_expr (! TYPE_SIGNED (Type), /* The type is unsigned. */ \
571 (((Type) -1 / 10 < (Accum) \
572 || (Type) ((Accum) * 10 + (Digit_val)) < (Accum)) \
573 ? false \
574 : (((Accum) = (Accum) * 10 + (Digit_val)), true))) \
575 )
576
577 static inline void
578 emit_stdin_note (void)
579 {
580 fputs (_("\n\
581 With no FILE, or when FILE is -, read standard input.\n\
582 "), stdout);
583 }
584 static inline void
585 emit_mandatory_arg_note (void)
586 {
587 fputs (_("\n\
588 Mandatory arguments to long options are mandatory for short options too.\n\
589 "), stdout);
590 }
591
592 static inline void
593 emit_size_note (void)
594 {
595 fputs (_("\n\
596 The SIZE argument is an integer and optional unit (example: 10K is 10*1024).\n\
597 Units are K,M,G,T,P,E,Z,Y,R,Q (powers of 1024) or KB,MB,... (powers of 1000).\n\
598 Binary prefixes can be used, too: KiB=K, MiB=M, and so on.\n\
599 "), stdout);
600 }
601
602 static inline void
603 emit_blocksize_note (char const *program)
604 {
605 printf (_("\n\
606 Display values are in units of the first available SIZE from --block-size,\n\
607 and the %s_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables.\n\
608 Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).\n\
609 "), program);
610 }
611
612 static inline void
613 emit_update_parameters_note (void)
614 {
615 fputs (_("\
616 \n\
617 UPDATE controls which existing files in the destination are replaced.\n\
618 'all' is the default operation when an --update option is not specified,\n\
619 and results in all existing files in the destination being replaced.\n\
620 'none' is similar to the --no-clobber option, in that no files in the\n\
621 destination are replaced, but also skipped files do not induce a failure.\n\
622 'older' is the default operation when --update is specified, and results\n\
623 in files being replaced if they're older than the corresponding source file.\n\
624 "), stdout);
625 }
626
627 static inline void
628 emit_backup_suffix_note (void)
629 {
630 fputs (_("\
631 \n\
632 The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
633 The version control method may be selected via the --backup option or through\n\
634 the VERSION_CONTROL environment variable. Here are the values:\n\
635 \n\
636 "), stdout);
637 fputs (_("\
638 none, off never make backups (even if --backup is given)\n\
639 numbered, t make numbered backups\n\
640 existing, nil numbered if numbered backups exist, simple otherwise\n\
641 simple, never always make simple backups\n\
642 "), stdout);
643 }
644
645 static inline void
646 emit_exec_status (char const *program)
647 {
648 printf (_("\n\
649 Exit status:\n\
650 125 if the %s command itself fails\n\
651 126 if COMMAND is found but cannot be invoked\n\
652 127 if COMMAND cannot be found\n\
653 - the exit status of COMMAND otherwise\n\
654 "), program);
655 }
656
657 static inline void
658 emit_ancillary_info (char const *program)
659 {
660 struct infomap { char const *program; char const *node; } const infomap[] = {
661 { "[", "test invocation" },
662 { "coreutils", "Multi-call invocation" },
663 { "sha224sum", "sha2 utilities" },
664 { "sha256sum", "sha2 utilities" },
665 { "sha384sum", "sha2 utilities" },
666 { "sha512sum", "sha2 utilities" },
667 { nullptr, nullptr }
668 };
669
670 char const *node = program;
671 struct infomap const *map_prog = infomap;
672
673 while (map_prog->program && ! STREQ (program, map_prog->program))
674 map_prog++;
675
676 if (map_prog->node)
677 node = map_prog->node;
678
679 printf (_("\n%s online help: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
680
681 /* Don't output this redundant message for English locales.
682 Note we still output for 'C' so that it gets included in the man page. */
683 char const *lc_messages = setlocale (LC_MESSAGES, nullptr);
684 if (lc_messages && STRNCMP_LIT (lc_messages, "en_"))
685 {
686 /* TRANSLATORS: Replace LANG_CODE in this URL with your language code
687 <https://translationproject.org/team/LANG_CODE.html> to form one of
688 the URLs at https://translationproject.org/team/. Otherwise, replace
689 the entire URL with your translation team's email address. */
690 fputs (_("Report any translation bugs to "
691 "<https://translationproject.org/team/>\n"), stdout);
692 }
693 /* .htaccess on the coreutils web site maps programs to the appropriate page,
694 however we explicitly handle "[" -> "test" here as the "[" is not
695 recognized as part of a URL by default in terminals. */
696 char const *url_program = STREQ (program, "[") ? "test" : program;
697 printf (_("Full documentation <%s%s>\n"),
698 PACKAGE_URL, url_program);
699 printf (_("or available locally via: info '(coreutils) %s%s'\n"),
700 node, node == program ? " invocation" : "");
701 }
702
703 /* Use a macro rather than an inline function, as this references
704 the global program_name, which causes dynamic linking issues
705 in libstdbuf.so on some systems where unused functions
706 are not removed by the linker. */
707 #define emit_try_help() \
708 do \
709 { \
710 fprintf (stderr, _("Try '%s --help' for more information.\n"), \
711 program_name); \
712 } \
713 while (0)
714
715 #include "inttostr.h"
716
717 static inline char *
718 timetostr (time_t t, char *buf)
719 {
720 return (TYPE_SIGNED (time_t)
721 ? imaxtostr (t, buf)
722 : umaxtostr (t, buf));
723 }
724
725 static inline char *
726 bad_cast (char const *s)
727 {
728 return (char *) s;
729 }
730
731 /* Return a boolean indicating whether SB->st_size is defined. */
732 static inline bool
733 usable_st_size (struct stat const *sb)
734 {
735 return (S_ISREG (sb->st_mode) || S_ISLNK (sb->st_mode)
736 || S_TYPEISSHM (sb) || S_TYPEISTMO (sb));
737 }
738
739 _Noreturn void usage (int status);
740
741 #include "error.h"
742
743 /* Like error(0, 0, ...), but without an implicit newline.
744 Also a noop unless the global DEV_DEBUG is set. */
745 #define devmsg(...) \
746 do \
747 { \
748 if (dev_debug) \
749 fprintf (stderr, __VA_ARGS__); \
750 } \
751 while (0)
752
753 #define emit_cycle_warning(file_name) \
754 do \
755 { \
756 error (0, 0, _("\
757 WARNING: Circular directory structure.\n\
758 This almost certainly means that you have a corrupted file system.\n\
759 NOTIFY YOUR SYSTEM MANAGER.\n\
760 The following directory is part of the cycle:\n %s\n"), \
761 quotef (file_name)); \
762 } \
763 while (0)
764
765 /* exit with a _single_ "write error" diagnostic. */
766
767 static inline void
768 write_error (void)
769 {
770 int saved_errno = errno;
771 fflush (stdout); /* Last attempt to write any buffered data. */
772 fpurge (stdout); /* Ensure nothing buffered that might induce an error. */
773 clearerr (stdout); /* Avoid extraneous diagnostic from close_stdout. */
774 error (EXIT_FAILURE, saved_errno, _("write error"));
775 }
776
777 /* Like stpncpy, but do ensure that the result is NUL-terminated,
778 and do not NUL-pad out to LEN. I.e., when strnlen (src, len) == len,
779 this function writes a NUL byte into dest[len]. Thus, the length
780 of the destination buffer must be at least LEN + 1.
781 The DEST and SRC buffers must not overlap. */
782 static inline char *
783 stzncpy (char *restrict dest, char const *restrict src, size_t len)
784 {
785 size_t i;
786 for (i = 0; i < len && *src; i++)
787 *dest++ = *src++;
788 *dest = 0;
789 return dest;
790 }
791
792 #ifndef ARRAY_CARDINALITY
793 # define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
794 #endif
795
796 /* Return true if ERR is ENOTSUP or EOPNOTSUPP, otherwise false.
797 This wrapper function avoids the redundant 'or'd comparison on
798 systems like Linux for which they have the same value. It also
799 avoids the gcc warning to that effect. */
800 static inline bool
801 is_ENOTSUP (int err)
802 {
803 return err == EOPNOTSUPP || (ENOTSUP != EOPNOTSUPP && err == ENOTSUP);
804 }
805
806
807 /* How coreutils quotes filenames, to minimize use of outer quotes,
808 but also provide better support for copy and paste when used. */
809 #include "quotearg.h"
810
811 /* Use these to shell quote only when necessary,
812 when the quoted item is already delimited with colons. */
813 #define quotef(arg) \
814 quotearg_n_style_colon (0, shell_escape_quoting_style, arg)
815 #define quotef_n(n, arg) \
816 quotearg_n_style_colon (n, shell_escape_quoting_style, arg)
817
818 /* Use these when there are spaces around the file name,
819 in the error message. */
820 #define quoteaf(arg) \
821 quotearg_style (shell_escape_always_quoting_style, arg)
822 #define quoteaf_n(n, arg) \
823 quotearg_n_style (n, shell_escape_always_quoting_style, arg)