e955bb5e8b3101cc8c753cf541beabf5cd037b39
[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 #ifdef WIN32 /* 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 #endif
96
97 #include <unistd.h>
98 #include <stdio.h>
99 #include <sys/stat.h>
100 #include <fcntl.h>
101 #include <stddef.h>
102 #include <stdlib.h>
103 #include <stdarg.h>
104 #include <string.h>
105 #ifdef HAVE_STRINGS_H
106 #include <strings.h> /* for strcasecmp() */
107 #endif
108 #include <errno.h>
109 #include <limits.h>
110 #ifdef NEEDS_SYS_PARAM_H
111 #include <sys/param.h>
112 #endif
113 #include <sys/types.h>
114 #include <dirent.h>
115 #include <sys/time.h>
116 #include <time.h>
117 #include <signal.h>
118 #ifndef USE_WILDMATCH
119 #include <fnmatch.h>
120 #endif
121 #include <assert.h>
122 #include <regex.h>
123 #include <utime.h>
124 #include <syslog.h>
125 #ifndef NO_SYS_POLL_H
126 #include <sys/poll.h>
127 #else
128 #include <poll.h>
129 #endif
130 #if defined(__MINGW32__)
131 /* pull in Windows compatibility stuff */
132 #include "compat/mingw.h"
133 #elif defined(_MSC_VER)
134 #include "compat/msvc.h"
135 #else
136 #include <sys/wait.h>
137 #include <sys/resource.h>
138 #include <sys/socket.h>
139 #include <sys/ioctl.h>
140 #include <termios.h>
141 #ifndef NO_SYS_SELECT_H
142 #include <sys/select.h>
143 #endif
144 #include <netinet/in.h>
145 #include <netinet/tcp.h>
146 #include <arpa/inet.h>
147 #include <netdb.h>
148 #include <pwd.h>
149 #include <sys/un.h>
150 #ifndef NO_INTTYPES_H
151 #include <inttypes.h>
152 #else
153 #include <stdint.h>
154 #endif
155 #ifdef NO_INTPTR_T
156 /*
157 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
158 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
159 * while on IP16 and IP16L32 it is "int" (resp. "short")
160 * Size needs to match (or exceed) 'sizeof(void *)'.
161 * We can't take "long long" here as not everybody has it.
162 */
163 typedef long intptr_t;
164 typedef unsigned long uintptr_t;
165 #endif
166 int get_st_mode_bits(const char *path, int *mode);
167 #if defined(__CYGWIN__)
168 #undef _XOPEN_SOURCE
169 #include <grp.h>
170 #define _XOPEN_SOURCE 600
171 #include "compat/cygwin.h"
172 #else
173 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
174 #include <grp.h>
175 #define _ALL_SOURCE 1
176 #endif
177 #endif
178
179 /* used on Mac OS X */
180 #ifdef PRECOMPOSE_UNICODE
181 #include "compat/precompose_utf8.h"
182 #else
183 #define precompose_str(in,i_nfd2nfc)
184 #define precompose_argv(c,v)
185 #define probe_utf8_pathname_composition(a,b)
186 #endif
187
188 #ifdef MKDIR_WO_TRAILING_SLASH
189 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
190 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
191 #endif
192
193 #ifdef NO_STRUCT_ITIMERVAL
194 struct itimerval {
195 struct timeval it_interval;
196 struct timeval it_value;
197 }
198 #endif
199
200 #ifdef NO_SETITIMER
201 #define setitimer(which,value,ovalue)
202 #endif
203
204 #ifndef NO_LIBGEN_H
205 #include <libgen.h>
206 #else
207 #define basename gitbasename
208 extern char *gitbasename(char *);
209 #endif
210
211 #ifndef NO_ICONV
212 #include <iconv.h>
213 #endif
214
215 #ifndef NO_OPENSSL
216 #include <openssl/ssl.h>
217 #include <openssl/err.h>
218 #endif
219
220 /* On most systems <netdb.h> would have given us this, but
221 * not on some systems (e.g. z/OS).
222 */
223 #ifndef NI_MAXHOST
224 #define NI_MAXHOST 1025
225 #endif
226
227 #ifndef NI_MAXSERV
228 #define NI_MAXSERV 32
229 #endif
230
231 /* On most systems <limits.h> would have given us this, but
232 * not on some systems (e.g. GNU/Hurd).
233 */
234 #ifndef PATH_MAX
235 #define PATH_MAX 4096
236 #endif
237
238 #ifndef PRIuMAX
239 #define PRIuMAX "llu"
240 #endif
241
242 #ifndef PRIu32
243 #define PRIu32 "u"
244 #endif
245
246 #ifndef PRIx32
247 #define PRIx32 "x"
248 #endif
249
250 #ifndef PRIo32
251 #define PRIo32 "o"
252 #endif
253
254 #ifndef PATH_SEP
255 #define PATH_SEP ':'
256 #endif
257
258 #ifdef HAVE_PATHS_H
259 #include <paths.h>
260 #endif
261 #ifndef _PATH_DEFPATH
262 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
263 #endif
264
265 #ifndef STRIP_EXTENSION
266 #define STRIP_EXTENSION ""
267 #endif
268
269 #ifndef has_dos_drive_prefix
270 #define has_dos_drive_prefix(path) 0
271 #endif
272
273 #ifndef is_dir_sep
274 #define is_dir_sep(c) ((c) == '/')
275 #endif
276
277 #ifndef find_last_dir_sep
278 #define find_last_dir_sep(path) strrchr(path, '/')
279 #endif
280
281 #if defined(__HP_cc) && (__HP_cc >= 61000)
282 #define NORETURN __attribute__((noreturn))
283 #define NORETURN_PTR
284 #elif defined(__GNUC__) && !defined(NO_NORETURN)
285 #define NORETURN __attribute__((__noreturn__))
286 #define NORETURN_PTR __attribute__((__noreturn__))
287 #elif defined(_MSC_VER)
288 #define NORETURN __declspec(noreturn)
289 #define NORETURN_PTR
290 #else
291 #define NORETURN
292 #define NORETURN_PTR
293 #ifndef __attribute__
294 #define __attribute__(x)
295 #endif
296 #endif
297
298 #include "compat/bswap.h"
299
300 #ifdef USE_WILDMATCH
301 #include "wildmatch.h"
302 #define FNM_PATHNAME WM_PATHNAME
303 #define FNM_CASEFOLD WM_CASEFOLD
304 #define FNM_NOMATCH WM_NOMATCH
305 static inline int fnmatch(const char *pattern, const char *string, int flags)
306 {
307 return wildmatch(pattern, string, flags, NULL);
308 }
309 #endif
310
311 /* General helper functions */
312 extern void vreportf(const char *prefix, const char *err, va_list params);
313 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
314 extern NORETURN void usage(const char *err);
315 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
316 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
317 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
318 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
319 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
320
321 /*
322 * Let callers be aware of the constant return value; this can help
323 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
324 * because some compilers may not support variadic macros. Since we're only
325 * trying to help gcc, anyway, it's OK; other compilers will fall back to
326 * using the function as usual.
327 */
328 #if defined(__GNUC__) && ! defined(__clang__)
329 #define error(...) (error(__VA_ARGS__), -1)
330 #endif
331
332 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
333 extern void set_error_routine(void (*routine)(const char *err, va_list params));
334 extern void set_die_is_recursing_routine(int (*routine)(void));
335
336 extern int prefixcmp(const char *str, const char *prefix);
337 extern int suffixcmp(const char *str, const char *suffix);
338
339 static inline const char *skip_prefix(const char *str, const char *prefix)
340 {
341 size_t len = strlen(prefix);
342 return strncmp(str, prefix, len) ? NULL : str + len;
343 }
344
345 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
346
347 #ifndef PROT_READ
348 #define PROT_READ 1
349 #define PROT_WRITE 2
350 #define MAP_PRIVATE 1
351 #endif
352
353 #define mmap git_mmap
354 #define munmap git_munmap
355 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
356 extern int git_munmap(void *start, size_t length);
357
358 #else /* NO_MMAP || USE_WIN32_MMAP */
359
360 #include <sys/mman.h>
361
362 #endif /* NO_MMAP || USE_WIN32_MMAP */
363
364 #ifdef NO_MMAP
365
366 /* This value must be multiple of (pagesize * 2) */
367 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
368
369 #else /* NO_MMAP */
370
371 /* This value must be multiple of (pagesize * 2) */
372 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
373 (sizeof(void*) >= 8 \
374 ? 1 * 1024 * 1024 * 1024 \
375 : 32 * 1024 * 1024)
376
377 #endif /* NO_MMAP */
378
379 #ifndef MAP_FAILED
380 #define MAP_FAILED ((void *)-1)
381 #endif
382
383 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
384 #define on_disk_bytes(st) ((st).st_size)
385 #else
386 #define on_disk_bytes(st) ((st).st_blocks * 512)
387 #endif
388
389 #define DEFAULT_PACKED_GIT_LIMIT \
390 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
391
392 #ifdef NO_PREAD
393 #define pread git_pread
394 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
395 #endif
396 /*
397 * Forward decl that will remind us if its twin in cache.h changes.
398 * This function is used in compat/pread.c. But we can't include
399 * cache.h there.
400 */
401 extern ssize_t read_in_full(int fd, void *buf, size_t count);
402
403 #ifdef NO_SETENV
404 #define setenv gitsetenv
405 extern int gitsetenv(const char *, const char *, int);
406 #endif
407
408 #ifdef NO_MKDTEMP
409 #define mkdtemp gitmkdtemp
410 extern char *gitmkdtemp(char *);
411 #endif
412
413 #ifdef NO_MKSTEMPS
414 #define mkstemps gitmkstemps
415 extern int gitmkstemps(char *, int);
416 #endif
417
418 #ifdef NO_UNSETENV
419 #define unsetenv gitunsetenv
420 extern void gitunsetenv(const char *);
421 #endif
422
423 #ifdef NO_STRCASESTR
424 #define strcasestr gitstrcasestr
425 extern char *gitstrcasestr(const char *haystack, const char *needle);
426 #endif
427
428 #ifdef NO_STRLCPY
429 #define strlcpy gitstrlcpy
430 extern size_t gitstrlcpy(char *, const char *, size_t);
431 #endif
432
433 #ifdef NO_STRTOUMAX
434 #define strtoumax gitstrtoumax
435 extern uintmax_t gitstrtoumax(const char *, char **, int);
436 #define strtoimax gitstrtoimax
437 extern intmax_t gitstrtoimax(const char *, char **, int);
438 #endif
439
440 #ifdef NO_HSTRERROR
441 #define hstrerror githstrerror
442 extern const char *githstrerror(int herror);
443 #endif
444
445 #ifdef NO_MEMMEM
446 #define memmem gitmemmem
447 void *gitmemmem(const void *haystack, size_t haystacklen,
448 const void *needle, size_t needlelen);
449 #endif
450
451 #ifdef NO_GETPAGESIZE
452 #define getpagesize() sysconf(_SC_PAGESIZE)
453 #endif
454
455 #ifdef FREAD_READS_DIRECTORIES
456 #ifdef fopen
457 #undef fopen
458 #endif
459 #define fopen(a,b) git_fopen(a,b)
460 extern FILE *git_fopen(const char*, const char*);
461 #endif
462
463 #ifdef SNPRINTF_RETURNS_BOGUS
464 #define snprintf git_snprintf
465 extern int git_snprintf(char *str, size_t maxsize,
466 const char *format, ...);
467 #define vsnprintf git_vsnprintf
468 extern int git_vsnprintf(char *str, size_t maxsize,
469 const char *format, va_list ap);
470 #endif
471
472 #ifdef __GLIBC_PREREQ
473 #if __GLIBC_PREREQ(2, 1)
474 #define HAVE_STRCHRNUL
475 #define HAVE_MEMPCPY
476 #endif
477 #endif
478
479 #ifndef HAVE_STRCHRNUL
480 #define strchrnul gitstrchrnul
481 static inline char *gitstrchrnul(const char *s, int c)
482 {
483 while (*s && *s != c)
484 s++;
485 return (char *)s;
486 }
487 #endif
488
489 #ifndef HAVE_MEMPCPY
490 #define mempcpy gitmempcpy
491 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
492 {
493 return (char *)memcpy(dest, src, n) + n;
494 }
495 #endif
496
497 #ifdef NO_INET_PTON
498 int inet_pton(int af, const char *src, void *dst);
499 #endif
500
501 #ifdef NO_INET_NTOP
502 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
503 #endif
504
505 extern void release_pack_memory(size_t, int);
506
507 typedef void (*try_to_free_t)(size_t);
508 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
509
510 extern char *xstrdup(const char *str);
511 extern void *xmalloc(size_t size);
512 extern void *xmallocz(size_t size);
513 extern void *xmemdupz(const void *data, size_t len);
514 extern char *xstrndup(const char *str, size_t len);
515 extern void *xrealloc(void *ptr, size_t size);
516 extern void *xcalloc(size_t nmemb, size_t size);
517 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
518 extern ssize_t xread(int fd, void *buf, size_t len);
519 extern ssize_t xwrite(int fd, const void *buf, size_t len);
520 extern int xdup(int fd);
521 extern FILE *xfdopen(int fd, const char *mode);
522 extern int xmkstemp(char *template);
523 extern int xmkstemp_mode(char *template, int mode);
524 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
525 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
526
527 static inline size_t xsize_t(off_t len)
528 {
529 if (len > (size_t) len)
530 die("Cannot handle files this big");
531 return (size_t)len;
532 }
533
534 static inline int has_extension(const char *filename, const char *ext)
535 {
536 size_t len = strlen(filename);
537 size_t extlen = strlen(ext);
538 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
539 }
540
541 /* in ctype.c, for kwset users */
542 extern const char tolower_trans_tbl[256];
543
544 /* Sane ctype - no locale, and works with signed chars */
545 #undef isascii
546 #undef isspace
547 #undef isdigit
548 #undef isalpha
549 #undef isalnum
550 #undef isprint
551 #undef islower
552 #undef isupper
553 #undef tolower
554 #undef toupper
555 #undef iscntrl
556 #undef ispunct
557 #undef isxdigit
558
559 extern const unsigned char sane_ctype[256];
560 #define GIT_SPACE 0x01
561 #define GIT_DIGIT 0x02
562 #define GIT_ALPHA 0x04
563 #define GIT_GLOB_SPECIAL 0x08
564 #define GIT_REGEX_SPECIAL 0x10
565 #define GIT_PATHSPEC_MAGIC 0x20
566 #define GIT_CNTRL 0x40
567 #define GIT_PUNCT 0x80
568 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
569 #define isascii(x) (((x) & ~0x7f) == 0)
570 #define isspace(x) sane_istest(x,GIT_SPACE)
571 #define isdigit(x) sane_istest(x,GIT_DIGIT)
572 #define isalpha(x) sane_istest(x,GIT_ALPHA)
573 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
574 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
575 #define islower(x) sane_iscase(x, 1)
576 #define isupper(x) sane_iscase(x, 0)
577 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
578 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
579 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
580 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
581 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
582 #define isxdigit(x) (hexval_table[x] != -1)
583 #define tolower(x) sane_case((unsigned char)(x), 0x20)
584 #define toupper(x) sane_case((unsigned char)(x), 0)
585 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
586
587 static inline int sane_case(int x, int high)
588 {
589 if (sane_istest(x, GIT_ALPHA))
590 x = (x & ~0x20) | high;
591 return x;
592 }
593
594 static inline int sane_iscase(int x, int is_lower)
595 {
596 if (!sane_istest(x, GIT_ALPHA))
597 return 0;
598
599 if (is_lower)
600 return (x & 0x20) != 0;
601 else
602 return (x & 0x20) == 0;
603 }
604
605 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
606 {
607 unsigned long ul;
608 char *p;
609
610 errno = 0;
611 ul = strtoul(s, &p, base);
612 if (errno || *p || p == s || (unsigned int) ul != ul)
613 return -1;
614 *result = ul;
615 return 0;
616 }
617
618 static inline int strtol_i(char const *s, int base, int *result)
619 {
620 long ul;
621 char *p;
622
623 errno = 0;
624 ul = strtol(s, &p, base);
625 if (errno || *p || p == s || (int) ul != ul)
626 return -1;
627 *result = ul;
628 return 0;
629 }
630
631 #ifdef INTERNAL_QSORT
632 void git_qsort(void *base, size_t nmemb, size_t size,
633 int(*compar)(const void *, const void *));
634 #define qsort git_qsort
635 #endif
636
637 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
638 # define FORCE_DIR_SET_GID S_ISGID
639 #else
640 # define FORCE_DIR_SET_GID 0
641 #endif
642
643 #ifdef NO_NSEC
644 #undef USE_NSEC
645 #define ST_CTIME_NSEC(st) 0
646 #define ST_MTIME_NSEC(st) 0
647 #else
648 #ifdef USE_ST_TIMESPEC
649 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
650 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
651 #else
652 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
653 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
654 #endif
655 #endif
656
657 #ifdef UNRELIABLE_FSTAT
658 #define fstat_is_reliable() 0
659 #else
660 #define fstat_is_reliable() 1
661 #endif
662
663 #ifndef va_copy
664 /*
665 * Since an obvious implementation of va_list would be to make it a
666 * pointer into the stack frame, a simple assignment will work on
667 * many systems. But let's try to be more portable.
668 */
669 #ifdef __va_copy
670 #define va_copy(dst, src) __va_copy(dst, src)
671 #else
672 #define va_copy(dst, src) ((dst) = (src))
673 #endif
674 #endif
675
676 /*
677 * Preserves errno, prints a message, but gives no warning for ENOENT.
678 * Always returns the return value of unlink(2).
679 */
680 int unlink_or_warn(const char *path);
681 /*
682 * Likewise for rmdir(2).
683 */
684 int rmdir_or_warn(const char *path);
685 /*
686 * Calls the correct function out of {unlink,rmdir}_or_warn based on
687 * the supplied file mode.
688 */
689 int remove_or_warn(unsigned int mode, const char *path);
690
691 /*
692 * Call access(2), but warn for any error except "missing file"
693 * (ENOENT or ENOTDIR).
694 */
695 int access_or_warn(const char *path, int mode);
696 int access_or_die(const char *path, int mode);
697
698 /* Warn on an inaccessible file that ought to be accessible */
699 void warn_on_inaccessible(const char *path);
700
701 /* Get the passwd entry for the UID of the current process. */
702 struct passwd *xgetpwuid_self(void);
703
704 #endif