Merge branch 'jk/gcc-function-attributes'
[git/git.git] / git-compat-util.h
1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
3
4 #define _FILE_OFFSET_BITS 64
5
6 #ifndef FLEX_ARRAY
7 /*
8 * See if our compiler is known to support flexible array members.
9 */
10 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
11 # define FLEX_ARRAY /* empty */
12 #elif defined(__GNUC__)
13 # if (__GNUC__ >= 3)
14 # define FLEX_ARRAY /* empty */
15 # else
16 # define FLEX_ARRAY 0 /* older GNU extension */
17 # endif
18 #endif
19
20 /*
21 * Otherwise, default to safer but a bit wasteful traditional style
22 */
23 #ifndef FLEX_ARRAY
24 # define FLEX_ARRAY 1
25 #endif
26 #endif
27
28 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
29 #define bitsizeof(x) (CHAR_BIT * sizeof(x))
30
31 #define maximum_signed_value_of_type(a) \
32 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
33
34 #define maximum_unsigned_value_of_type(a) \
35 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
36
37 /*
38 * Signed integer overflow is undefined in C, so here's a helper macro
39 * to detect if the sum of two integers will overflow.
40 *
41 * Requires: a >= 0, typeof(a) equals typeof(b)
42 */
43 #define signed_add_overflows(a, b) \
44 ((b) > maximum_signed_value_of_type(a) - (a))
45
46 #define unsigned_add_overflows(a, b) \
47 ((b) > maximum_unsigned_value_of_type(a) - (a))
48
49 #ifdef __GNUC__
50 #define TYPEOF(x) (__typeof__(x))
51 #else
52 #define TYPEOF(x)
53 #endif
54
55 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
56 #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
57
58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
59
60 /* Approximation of the length of the decimal representation of this type. */
61 #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
62
63 #if defined(__sun__)
64 /*
65 * On Solaris, when _XOPEN_EXTENDED is set, its header file
66 * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
67 * setting to say we are XPG5 or XPG6. Also on Solaris,
68 * XPG6 programs must be compiled with a c99 compiler, while
69 * non XPG6 programs must be compiled with a pre-c99 compiler.
70 */
71 # if __STDC_VERSION__ - 0 >= 199901L
72 # define _XOPEN_SOURCE 600
73 # else
74 # define _XOPEN_SOURCE 500
75 # endif
76 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
77 !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
78 !defined(__TANDEM) && !defined(__QNX__)
79 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
80 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
81 #endif
82 #define _ALL_SOURCE 1
83 #define _GNU_SOURCE 1
84 #define _BSD_SOURCE 1
85 #define _NETBSD_SOURCE 1
86 #define _SGI_SOURCE 1
87
88 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
89 # if defined (_MSC_VER)
90 # define _WIN32_WINNT 0x0502
91 # endif
92 #define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
93 #include <winsock2.h>
94 #include <windows.h>
95 #define GIT_WINDOWS_NATIVE
96 #endif
97
98 #include <unistd.h>
99 #include <stdio.h>
100 #include <sys/stat.h>
101 #include <fcntl.h>
102 #include <stddef.h>
103 #include <stdlib.h>
104 #include <stdarg.h>
105 #include <string.h>
106 #ifdef HAVE_STRINGS_H
107 #include <strings.h> /* for strcasecmp() */
108 #endif
109 #include <errno.h>
110 #include <limits.h>
111 #ifdef NEEDS_SYS_PARAM_H
112 #include <sys/param.h>
113 #endif
114 #include <sys/types.h>
115 #include <dirent.h>
116 #include <sys/time.h>
117 #include <time.h>
118 #include <signal.h>
119 #ifndef USE_WILDMATCH
120 #include <fnmatch.h>
121 #endif
122 #include <assert.h>
123 #include <regex.h>
124 #include <utime.h>
125 #include <syslog.h>
126 #ifndef NO_SYS_POLL_H
127 #include <sys/poll.h>
128 #else
129 #include <poll.h>
130 #endif
131
132 extern int get_st_mode_bits(const char *path, int *mode);
133
134 #if defined(__MINGW32__)
135 /* pull in Windows compatibility stuff */
136 #include "compat/mingw.h"
137 #elif defined(_MSC_VER)
138 #include "compat/msvc.h"
139 #else
140 #include <sys/wait.h>
141 #include <sys/resource.h>
142 #include <sys/socket.h>
143 #include <sys/ioctl.h>
144 #include <termios.h>
145 #ifndef NO_SYS_SELECT_H
146 #include <sys/select.h>
147 #endif
148 #include <netinet/in.h>
149 #include <netinet/tcp.h>
150 #include <arpa/inet.h>
151 #include <netdb.h>
152 #include <pwd.h>
153 #include <sys/un.h>
154 #ifndef NO_INTTYPES_H
155 #include <inttypes.h>
156 #else
157 #include <stdint.h>
158 #endif
159 #ifdef NO_INTPTR_T
160 /*
161 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
162 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
163 * while on IP16 and IP16L32 it is "int" (resp. "short")
164 * Size needs to match (or exceed) 'sizeof(void *)'.
165 * We can't take "long long" here as not everybody has it.
166 */
167 typedef long intptr_t;
168 typedef unsigned long uintptr_t;
169 #endif
170 #if defined(__CYGWIN__)
171 #undef _XOPEN_SOURCE
172 #include <grp.h>
173 #define _XOPEN_SOURCE 600
174 #include "compat/cygwin.h"
175 #else
176 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
177 #include <grp.h>
178 #define _ALL_SOURCE 1
179 #endif
180 #endif
181
182 /* used on Mac OS X */
183 #ifdef PRECOMPOSE_UNICODE
184 #include "compat/precompose_utf8.h"
185 #else
186 #define precompose_str(in,i_nfd2nfc)
187 #define precompose_argv(c,v)
188 #define probe_utf8_pathname_composition(a,b)
189 #endif
190
191 #ifdef NEEDS_CLIPPED_WRITE
192 ssize_t clipped_write(int fildes, const void *buf, size_t nbyte);
193 #define write(x,y,z) clipped_write((x),(y),(z))
194 #endif
195
196 #ifdef MKDIR_WO_TRAILING_SLASH
197 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
198 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
199 #endif
200
201 #ifdef NO_STRUCT_ITIMERVAL
202 struct itimerval {
203 struct timeval it_interval;
204 struct timeval it_value;
205 }
206 #endif
207
208 #ifdef NO_SETITIMER
209 #define setitimer(which,value,ovalue)
210 #endif
211
212 #ifndef NO_LIBGEN_H
213 #include <libgen.h>
214 #else
215 #define basename gitbasename
216 extern char *gitbasename(char *);
217 #endif
218
219 #ifndef NO_ICONV
220 #include <iconv.h>
221 #endif
222
223 #ifndef NO_OPENSSL
224 #include <openssl/ssl.h>
225 #include <openssl/err.h>
226 #endif
227
228 /* On most systems <netdb.h> would have given us this, but
229 * not on some systems (e.g. z/OS).
230 */
231 #ifndef NI_MAXHOST
232 #define NI_MAXHOST 1025
233 #endif
234
235 #ifndef NI_MAXSERV
236 #define NI_MAXSERV 32
237 #endif
238
239 /* On most systems <limits.h> would have given us this, but
240 * not on some systems (e.g. GNU/Hurd).
241 */
242 #ifndef PATH_MAX
243 #define PATH_MAX 4096
244 #endif
245
246 #ifndef PRIuMAX
247 #define PRIuMAX "llu"
248 #endif
249
250 #ifndef PRIu32
251 #define PRIu32 "u"
252 #endif
253
254 #ifndef PRIx32
255 #define PRIx32 "x"
256 #endif
257
258 #ifndef PRIo32
259 #define PRIo32 "o"
260 #endif
261
262 #ifndef PATH_SEP
263 #define PATH_SEP ':'
264 #endif
265
266 #ifdef HAVE_PATHS_H
267 #include <paths.h>
268 #endif
269 #ifndef _PATH_DEFPATH
270 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
271 #endif
272
273 #ifndef STRIP_EXTENSION
274 #define STRIP_EXTENSION ""
275 #endif
276
277 #ifndef has_dos_drive_prefix
278 #define has_dos_drive_prefix(path) 0
279 #endif
280
281 #ifndef is_dir_sep
282 #define is_dir_sep(c) ((c) == '/')
283 #endif
284
285 #ifndef find_last_dir_sep
286 #define find_last_dir_sep(path) strrchr(path, '/')
287 #endif
288
289 #if defined(__HP_cc) && (__HP_cc >= 61000)
290 #define NORETURN __attribute__((noreturn))
291 #define NORETURN_PTR
292 #elif defined(__GNUC__) && !defined(NO_NORETURN)
293 #define NORETURN __attribute__((__noreturn__))
294 #define NORETURN_PTR __attribute__((__noreturn__))
295 #elif defined(_MSC_VER)
296 #define NORETURN __declspec(noreturn)
297 #define NORETURN_PTR
298 #else
299 #define NORETURN
300 #define NORETURN_PTR
301 #ifndef __attribute__
302 #define __attribute__(x)
303 #endif
304 #endif
305
306 /* The sentinel attribute is valid from gcc version 4.0 */
307 #if defined(__GNUC__) && (__GNUC__ >= 4)
308 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
309 #else
310 #define LAST_ARG_MUST_BE_NULL
311 #endif
312
313 #include "compat/bswap.h"
314
315 #ifdef USE_WILDMATCH
316 #include "wildmatch.h"
317 #define FNM_PATHNAME WM_PATHNAME
318 #define FNM_CASEFOLD WM_CASEFOLD
319 #define FNM_NOMATCH WM_NOMATCH
320 static inline int fnmatch(const char *pattern, const char *string, int flags)
321 {
322 return wildmatch(pattern, string, flags, NULL);
323 }
324 #endif
325
326 /* General helper functions */
327 extern void vreportf(const char *prefix, const char *err, va_list params);
328 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
329 extern NORETURN void usage(const char *err);
330 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
331 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
332 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
333 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
334 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
335
336 /*
337 * Let callers be aware of the constant return value; this can help
338 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
339 * because some compilers may not support variadic macros. Since we're only
340 * trying to help gcc, anyway, it's OK; other compilers will fall back to
341 * using the function as usual.
342 */
343 #if defined(__GNUC__) && ! defined(__clang__)
344 #define error(...) (error(__VA_ARGS__), -1)
345 #endif
346
347 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
348 extern void set_error_routine(void (*routine)(const char *err, va_list params));
349 extern void set_die_is_recursing_routine(int (*routine)(void));
350
351 extern int prefixcmp(const char *str, const char *prefix);
352 extern int suffixcmp(const char *str, const char *suffix);
353
354 static inline const char *skip_prefix(const char *str, const char *prefix)
355 {
356 size_t len = strlen(prefix);
357 return strncmp(str, prefix, len) ? NULL : str + len;
358 }
359
360 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
361
362 #ifndef PROT_READ
363 #define PROT_READ 1
364 #define PROT_WRITE 2
365 #define MAP_PRIVATE 1
366 #endif
367
368 #define mmap git_mmap
369 #define munmap git_munmap
370 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
371 extern int git_munmap(void *start, size_t length);
372
373 #else /* NO_MMAP || USE_WIN32_MMAP */
374
375 #include <sys/mman.h>
376
377 #endif /* NO_MMAP || USE_WIN32_MMAP */
378
379 #ifdef NO_MMAP
380
381 /* This value must be multiple of (pagesize * 2) */
382 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
383
384 #else /* NO_MMAP */
385
386 /* This value must be multiple of (pagesize * 2) */
387 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
388 (sizeof(void*) >= 8 \
389 ? 1 * 1024 * 1024 * 1024 \
390 : 32 * 1024 * 1024)
391
392 #endif /* NO_MMAP */
393
394 #ifndef MAP_FAILED
395 #define MAP_FAILED ((void *)-1)
396 #endif
397
398 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
399 #define on_disk_bytes(st) ((st).st_size)
400 #else
401 #define on_disk_bytes(st) ((st).st_blocks * 512)
402 #endif
403
404 #define DEFAULT_PACKED_GIT_LIMIT \
405 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
406
407 #ifdef NO_PREAD
408 #define pread git_pread
409 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
410 #endif
411 /*
412 * Forward decl that will remind us if its twin in cache.h changes.
413 * This function is used in compat/pread.c. But we can't include
414 * cache.h there.
415 */
416 extern ssize_t read_in_full(int fd, void *buf, size_t count);
417
418 #ifdef NO_SETENV
419 #define setenv gitsetenv
420 extern int gitsetenv(const char *, const char *, int);
421 #endif
422
423 #ifdef NO_MKDTEMP
424 #define mkdtemp gitmkdtemp
425 extern char *gitmkdtemp(char *);
426 #endif
427
428 #ifdef NO_MKSTEMPS
429 #define mkstemps gitmkstemps
430 extern int gitmkstemps(char *, int);
431 #endif
432
433 #ifdef NO_UNSETENV
434 #define unsetenv gitunsetenv
435 extern void gitunsetenv(const char *);
436 #endif
437
438 #ifdef NO_STRCASESTR
439 #define strcasestr gitstrcasestr
440 extern char *gitstrcasestr(const char *haystack, const char *needle);
441 #endif
442
443 #ifdef NO_STRLCPY
444 #define strlcpy gitstrlcpy
445 extern size_t gitstrlcpy(char *, const char *, size_t);
446 #endif
447
448 #ifdef NO_STRTOUMAX
449 #define strtoumax gitstrtoumax
450 extern uintmax_t gitstrtoumax(const char *, char **, int);
451 #define strtoimax gitstrtoimax
452 extern intmax_t gitstrtoimax(const char *, char **, int);
453 #endif
454
455 #ifdef NO_HSTRERROR
456 #define hstrerror githstrerror
457 extern const char *githstrerror(int herror);
458 #endif
459
460 #ifdef NO_MEMMEM
461 #define memmem gitmemmem
462 void *gitmemmem(const void *haystack, size_t haystacklen,
463 const void *needle, size_t needlelen);
464 #endif
465
466 #ifdef NO_GETPAGESIZE
467 #define getpagesize() sysconf(_SC_PAGESIZE)
468 #endif
469
470 #ifdef FREAD_READS_DIRECTORIES
471 #ifdef fopen
472 #undef fopen
473 #endif
474 #define fopen(a,b) git_fopen(a,b)
475 extern FILE *git_fopen(const char*, const char*);
476 #endif
477
478 #ifdef SNPRINTF_RETURNS_BOGUS
479 #define snprintf git_snprintf
480 extern int git_snprintf(char *str, size_t maxsize,
481 const char *format, ...);
482 #define vsnprintf git_vsnprintf
483 extern int git_vsnprintf(char *str, size_t maxsize,
484 const char *format, va_list ap);
485 #endif
486
487 #ifdef __GLIBC_PREREQ
488 #if __GLIBC_PREREQ(2, 1)
489 #define HAVE_STRCHRNUL
490 #define HAVE_MEMPCPY
491 #endif
492 #endif
493
494 #ifndef HAVE_STRCHRNUL
495 #define strchrnul gitstrchrnul
496 static inline char *gitstrchrnul(const char *s, int c)
497 {
498 while (*s && *s != c)
499 s++;
500 return (char *)s;
501 }
502 #endif
503
504 #ifndef HAVE_MEMPCPY
505 #define mempcpy gitmempcpy
506 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
507 {
508 return (char *)memcpy(dest, src, n) + n;
509 }
510 #endif
511
512 #ifdef NO_INET_PTON
513 int inet_pton(int af, const char *src, void *dst);
514 #endif
515
516 #ifdef NO_INET_NTOP
517 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
518 #endif
519
520 extern void release_pack_memory(size_t, int);
521
522 typedef void (*try_to_free_t)(size_t);
523 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
524
525 extern char *xstrdup(const char *str);
526 extern void *xmalloc(size_t size);
527 extern void *xmallocz(size_t size);
528 extern void *xmemdupz(const void *data, size_t len);
529 extern char *xstrndup(const char *str, size_t len);
530 extern void *xrealloc(void *ptr, size_t size);
531 extern void *xcalloc(size_t nmemb, size_t size);
532 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
533 extern ssize_t xread(int fd, void *buf, size_t len);
534 extern ssize_t xwrite(int fd, const void *buf, size_t len);
535 extern int xdup(int fd);
536 extern FILE *xfdopen(int fd, const char *mode);
537 extern int xmkstemp(char *template);
538 extern int xmkstemp_mode(char *template, int mode);
539 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
540 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
541
542 static inline size_t xsize_t(off_t len)
543 {
544 if (len > (size_t) len)
545 die("Cannot handle files this big");
546 return (size_t)len;
547 }
548
549 static inline int has_extension(const char *filename, const char *ext)
550 {
551 size_t len = strlen(filename);
552 size_t extlen = strlen(ext);
553 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
554 }
555
556 /* in ctype.c, for kwset users */
557 extern const char tolower_trans_tbl[256];
558
559 /* Sane ctype - no locale, and works with signed chars */
560 #undef isascii
561 #undef isspace
562 #undef isdigit
563 #undef isalpha
564 #undef isalnum
565 #undef isprint
566 #undef islower
567 #undef isupper
568 #undef tolower
569 #undef toupper
570 #undef iscntrl
571 #undef ispunct
572 #undef isxdigit
573
574 extern const unsigned char sane_ctype[256];
575 #define GIT_SPACE 0x01
576 #define GIT_DIGIT 0x02
577 #define GIT_ALPHA 0x04
578 #define GIT_GLOB_SPECIAL 0x08
579 #define GIT_REGEX_SPECIAL 0x10
580 #define GIT_PATHSPEC_MAGIC 0x20
581 #define GIT_CNTRL 0x40
582 #define GIT_PUNCT 0x80
583 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
584 #define isascii(x) (((x) & ~0x7f) == 0)
585 #define isspace(x) sane_istest(x,GIT_SPACE)
586 #define isdigit(x) sane_istest(x,GIT_DIGIT)
587 #define isalpha(x) sane_istest(x,GIT_ALPHA)
588 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
589 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
590 #define islower(x) sane_iscase(x, 1)
591 #define isupper(x) sane_iscase(x, 0)
592 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
593 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
594 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
595 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
596 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
597 #define isxdigit(x) (hexval_table[x] != -1)
598 #define tolower(x) sane_case((unsigned char)(x), 0x20)
599 #define toupper(x) sane_case((unsigned char)(x), 0)
600 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
601
602 static inline int sane_case(int x, int high)
603 {
604 if (sane_istest(x, GIT_ALPHA))
605 x = (x & ~0x20) | high;
606 return x;
607 }
608
609 static inline int sane_iscase(int x, int is_lower)
610 {
611 if (!sane_istest(x, GIT_ALPHA))
612 return 0;
613
614 if (is_lower)
615 return (x & 0x20) != 0;
616 else
617 return (x & 0x20) == 0;
618 }
619
620 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
621 {
622 unsigned long ul;
623 char *p;
624
625 errno = 0;
626 ul = strtoul(s, &p, base);
627 if (errno || *p || p == s || (unsigned int) ul != ul)
628 return -1;
629 *result = ul;
630 return 0;
631 }
632
633 static inline int strtol_i(char const *s, int base, int *result)
634 {
635 long ul;
636 char *p;
637
638 errno = 0;
639 ul = strtol(s, &p, base);
640 if (errno || *p || p == s || (int) ul != ul)
641 return -1;
642 *result = ul;
643 return 0;
644 }
645
646 #ifdef INTERNAL_QSORT
647 void git_qsort(void *base, size_t nmemb, size_t size,
648 int(*compar)(const void *, const void *));
649 #define qsort git_qsort
650 #endif
651
652 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
653 # define FORCE_DIR_SET_GID S_ISGID
654 #else
655 # define FORCE_DIR_SET_GID 0
656 #endif
657
658 #ifdef NO_NSEC
659 #undef USE_NSEC
660 #define ST_CTIME_NSEC(st) 0
661 #define ST_MTIME_NSEC(st) 0
662 #else
663 #ifdef USE_ST_TIMESPEC
664 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
665 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
666 #else
667 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
668 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
669 #endif
670 #endif
671
672 #ifdef UNRELIABLE_FSTAT
673 #define fstat_is_reliable() 0
674 #else
675 #define fstat_is_reliable() 1
676 #endif
677
678 #ifndef va_copy
679 /*
680 * Since an obvious implementation of va_list would be to make it a
681 * pointer into the stack frame, a simple assignment will work on
682 * many systems. But let's try to be more portable.
683 */
684 #ifdef __va_copy
685 #define va_copy(dst, src) __va_copy(dst, src)
686 #else
687 #define va_copy(dst, src) ((dst) = (src))
688 #endif
689 #endif
690
691 /*
692 * Preserves errno, prints a message, but gives no warning for ENOENT.
693 * Always returns the return value of unlink(2).
694 */
695 int unlink_or_warn(const char *path);
696 /*
697 * Likewise for rmdir(2).
698 */
699 int rmdir_or_warn(const char *path);
700 /*
701 * Calls the correct function out of {unlink,rmdir}_or_warn based on
702 * the supplied file mode.
703 */
704 int remove_or_warn(unsigned int mode, const char *path);
705
706 /*
707 * Call access(2), but warn for any error except "missing file"
708 * (ENOENT or ENOTDIR).
709 */
710 #define ACCESS_EACCES_OK (1U << 0)
711 int access_or_warn(const char *path, int mode, unsigned flag);
712 int access_or_die(const char *path, int mode, unsigned flag);
713
714 /* Warn on an inaccessible file that ought to be accessible */
715 void warn_on_inaccessible(const char *path);
716
717 /* Get the passwd entry for the UID of the current process. */
718 struct passwd *xgetpwuid_self(void);
719
720 #endif