date: make DATE_MODE thread-safe
[git.git] / git-compat-util.h
blob7c2a6538e5afea607f3d9a1c09cc6aea5539d8de
1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
4 #if __STDC_VERSION__ - 0 < 199901L
5 /*
6 * Git is in a testing period for mandatory C99 support in the compiler. If
7 * your compiler is reasonably recent, you can try to enable C99 support (or,
8 * for MSVC, C11 support). If you encounter a problem and can't enable C99
9 * support with your compiler (such as with "-std=gnu99") and don't have access
10 * to one with this support, such as GCC or Clang, you can remove this #if
11 * directive, but please report the details of your system to
12 * git@vger.kernel.org.
14 #error "Required C99 support is in a test phase. Please see git-compat-util.h for more details."
15 #endif
17 #ifdef USE_MSVC_CRTDBG
19 * For these to work they must appear very early in each
20 * file -- before most of the standard header files.
22 #include <stdlib.h>
23 #include <crtdbg.h>
24 #endif
26 struct strbuf;
29 #define _FILE_OFFSET_BITS 64
32 /* Derived from Linux "Features Test Macro" header
33 * Convenience macros to test the versions of gcc (or
34 * a compatible compiler).
35 * Use them like this:
36 * #if GIT_GNUC_PREREQ (2,8)
37 * ... code requiring gcc 2.8 or later ...
38 * #endif
40 #if defined(__GNUC__) && defined(__GNUC_MINOR__)
41 # define GIT_GNUC_PREREQ(maj, min) \
42 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
43 #else
44 #define GIT_GNUC_PREREQ(maj, min) 0
45 #endif
48 #ifndef FLEX_ARRAY
50 * See if our compiler is known to support flexible array members.
54 * Check vendor specific quirks first, before checking the
55 * __STDC_VERSION__, as vendor compilers can lie and we need to be
56 * able to work them around. Note that by not defining FLEX_ARRAY
57 * here, we can fall back to use the "safer but a bit wasteful" one
58 * later.
60 #if defined(__SUNPRO_C) && (__SUNPRO_C <= 0x580)
61 #elif defined(__GNUC__)
62 # if (__GNUC__ >= 3)
63 # define FLEX_ARRAY /* empty */
64 # else
65 # define FLEX_ARRAY 0 /* older GNU extension */
66 # endif
67 #elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
68 # define FLEX_ARRAY /* empty */
69 #endif
72 * Otherwise, default to safer but a bit wasteful traditional style
74 #ifndef FLEX_ARRAY
75 # define FLEX_ARRAY 1
76 #endif
77 #endif
81 * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
82 * @cond: the compile-time condition which must be true.
84 * Your compile will fail if the condition isn't true, or can't be evaluated
85 * by the compiler. This can be used in an expression: its value is "0".
87 * Example:
88 * #define foo_to_char(foo) \
89 * ((char *)(foo) \
90 * + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
92 #define BUILD_ASSERT_OR_ZERO(cond) \
93 (sizeof(char [1 - 2*!(cond)]) - 1)
95 #if GIT_GNUC_PREREQ(3, 1)
96 /* &arr[0] degrades to a pointer: a different type from an array */
97 # define BARF_UNLESS_AN_ARRAY(arr) \
98 BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
99 __typeof__(&(arr)[0])))
100 # define BARF_UNLESS_COPYABLE(dst, src) \
101 BUILD_ASSERT_OR_ZERO(__builtin_types_compatible_p(__typeof__(*(dst)), \
102 __typeof__(*(src))))
103 #else
104 # define BARF_UNLESS_AN_ARRAY(arr) 0
105 # define BARF_UNLESS_COPYABLE(dst, src) \
106 BUILD_ASSERT_OR_ZERO(0 ? ((*(dst) = *(src)), 0) : \
107 sizeof(*(dst)) == sizeof(*(src)))
108 #endif
110 * ARRAY_SIZE - get the number of elements in a visible array
111 * @x: the array whose size you want.
113 * This does not work on pointers, or arrays declared as [], or
114 * function parameters. With correct compiler support, such usage
115 * will cause a build error (see the build_assert_or_zero macro).
117 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
119 #define bitsizeof(x) (CHAR_BIT * sizeof(x))
121 #define maximum_signed_value_of_type(a) \
122 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
124 #define maximum_unsigned_value_of_type(a) \
125 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
128 * Signed integer overflow is undefined in C, so here's a helper macro
129 * to detect if the sum of two integers will overflow.
131 * Requires: a >= 0, typeof(a) equals typeof(b)
133 #define signed_add_overflows(a, b) \
134 ((b) > maximum_signed_value_of_type(a) - (a))
136 #define unsigned_add_overflows(a, b) \
137 ((b) > maximum_unsigned_value_of_type(a) - (a))
140 * Returns true if the multiplication of "a" and "b" will
141 * overflow. The types of "a" and "b" must match and must be unsigned.
142 * Note that this macro evaluates "a" twice!
144 #define unsigned_mult_overflows(a, b) \
145 ((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
148 * Returns true if the left shift of "a" by "shift" bits will
149 * overflow. The type of "a" must be unsigned.
151 #define unsigned_left_shift_overflows(a, shift) \
152 ((shift) < bitsizeof(a) && \
153 (a) > maximum_unsigned_value_of_type(a) >> (shift))
155 #ifdef __GNUC__
156 #define TYPEOF(x) (__typeof__(x))
157 #else
158 #define TYPEOF(x)
159 #endif
161 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
162 #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
164 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
166 /* Approximation of the length of the decimal representation of this type. */
167 #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
169 #ifdef __MINGW64__
170 #define _POSIX_C_SOURCE 1
171 #elif defined(__sun__)
173 * On Solaris, when _XOPEN_EXTENDED is set, its header file
174 * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
175 * setting to say we are XPG5 or XPG6. Also on Solaris,
176 * XPG6 programs must be compiled with a c99 compiler, while
177 * non XPG6 programs must be compiled with a pre-c99 compiler.
179 # if __STDC_VERSION__ - 0 >= 199901L
180 # define _XOPEN_SOURCE 600
181 # else
182 # define _XOPEN_SOURCE 500
183 # endif
184 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
185 !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
186 !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
187 !defined(__CYGWIN__)
188 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
189 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
190 #endif
191 #define _ALL_SOURCE 1
192 #define _GNU_SOURCE 1
193 #define _BSD_SOURCE 1
194 #define _DEFAULT_SOURCE 1
195 #define _NETBSD_SOURCE 1
196 #define _SGI_SOURCE 1
198 #if GIT_GNUC_PREREQ(4, 5)
199 #define UNUSED __attribute__((unused)) \
200 __attribute__((deprecated ("parameter declared as UNUSED")))
201 #elif defined(__GNUC__)
202 #define UNUSED __attribute__((unused)) \
203 __attribute__((deprecated))
204 #else
205 #define UNUSED
206 #endif
208 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
209 # if !defined(_WIN32_WINNT)
210 # define _WIN32_WINNT 0x0600
211 # endif
212 #define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
213 #include <winsock2.h>
214 #ifndef NO_UNIX_SOCKETS
215 #include <afunix.h>
216 #endif
217 #include <windows.h>
218 #define GIT_WINDOWS_NATIVE
219 #endif
221 #include <unistd.h>
222 #include <stdio.h>
223 #include <sys/stat.h>
224 #include <fcntl.h>
225 #include <stddef.h>
226 #include <stdlib.h>
227 #include <stdarg.h>
228 #include <stdbool.h>
229 #include <string.h>
230 #ifdef HAVE_STRINGS_H
231 #include <strings.h> /* for strcasecmp() */
232 #endif
233 #include <errno.h>
234 #include <limits.h>
235 #include <locale.h>
236 #ifdef NEEDS_SYS_PARAM_H
237 #include <sys/param.h>
238 #endif
239 #include <sys/types.h>
240 #include <dirent.h>
241 #include <sys/time.h>
242 #include <time.h>
243 #include <signal.h>
244 #include <assert.h>
245 #include <regex.h>
246 #include <utime.h>
247 #include <syslog.h>
248 #if !defined(NO_POLL_H)
249 #include <poll.h>
250 #elif !defined(NO_SYS_POLL_H)
251 #include <sys/poll.h>
252 #else
253 /* Pull the compat stuff */
254 #include <poll.h>
255 #endif
256 #ifdef HAVE_BSD_SYSCTL
257 #include <sys/sysctl.h>
258 #endif
260 /* Used by compat/win32/path-utils.h, and more */
261 static inline int is_xplatform_dir_sep(int c)
263 return c == '/' || c == '\\';
266 #if defined(__CYGWIN__)
267 #include "compat/win32/path-utils.h"
268 #endif
269 #if defined(__MINGW32__)
270 /* pull in Windows compatibility stuff */
271 #include "compat/win32/path-utils.h"
272 #include "compat/mingw.h"
273 #elif defined(_MSC_VER)
274 #include "compat/win32/path-utils.h"
275 #include "compat/msvc.h"
276 #else
277 #include <sys/utsname.h>
278 #include <sys/wait.h>
279 #include <sys/resource.h>
280 #include <sys/socket.h>
281 #include <sys/ioctl.h>
282 #include <sys/statvfs.h>
283 #include <termios.h>
284 #ifndef NO_SYS_SELECT_H
285 #include <sys/select.h>
286 #endif
287 #include <netinet/in.h>
288 #include <netinet/tcp.h>
289 #include <arpa/inet.h>
290 #include <netdb.h>
291 #include <pwd.h>
292 #include <sys/un.h>
293 #ifndef NO_INTTYPES_H
294 #include <inttypes.h>
295 #else
296 #include <stdint.h>
297 #endif
298 #ifdef HAVE_ARC4RANDOM_LIBBSD
299 #include <bsd/stdlib.h>
300 #endif
301 #ifdef HAVE_GETRANDOM
302 #include <sys/random.h>
303 #endif
304 #ifdef NO_INTPTR_T
306 * On I16LP32, ILP32 and LP64 "long" is the safe bet, however
307 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
308 * while on IP16 and IP16L32 it is "int" (resp. "short")
309 * Size needs to match (or exceed) 'sizeof(void *)'.
310 * We can't take "long long" here as not everybody has it.
312 typedef long intptr_t;
313 typedef unsigned long uintptr_t;
314 #endif
315 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
316 #include <grp.h>
317 #define _ALL_SOURCE 1
318 #endif
320 /* used on Mac OS X */
321 #ifdef PRECOMPOSE_UNICODE
322 #include "compat/precompose_utf8.h"
323 #else
324 static inline const char *precompose_argv_prefix(int argc UNUSED,
325 const char **argv UNUSED,
326 const char *prefix)
328 return prefix;
330 static inline const char *precompose_string_if_needed(const char *in)
332 return in;
335 #define probe_utf8_pathname_composition()
336 #endif
338 #ifdef MKDIR_WO_TRAILING_SLASH
339 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
340 int compat_mkdir_wo_trailing_slash(const char*, mode_t);
341 #endif
343 #ifdef time
344 #undef time
345 #endif
346 static inline time_t git_time(time_t *tloc)
348 struct timeval tv;
351 * Avoid time(NULL), which can disagree with gettimeofday(2)
352 * and filesystem timestamps.
354 gettimeofday(&tv, NULL);
356 if (tloc)
357 *tloc = tv.tv_sec;
358 return tv.tv_sec;
360 #define time git_time
362 #ifdef NO_STRUCT_ITIMERVAL
363 struct itimerval {
364 struct timeval it_interval;
365 struct timeval it_value;
367 #endif
369 #ifdef NO_SETITIMER
370 static inline int git_setitimer(int which UNUSED,
371 const struct itimerval *value UNUSED,
372 struct itimerval *newvalue UNUSED) {
373 return 0; /* pretend success */
375 #undef setitimer
376 #define setitimer(which,value,ovalue) git_setitimer(which,value,ovalue)
377 #endif
379 #ifndef NO_LIBGEN_H
380 #include <libgen.h>
381 #else
382 #define basename gitbasename
383 char *gitbasename(char *);
384 #define dirname gitdirname
385 char *gitdirname(char *);
386 #endif
388 #ifndef NO_ICONV
389 #include <iconv.h>
390 #endif
392 #ifndef NO_OPENSSL
393 #ifdef __APPLE__
394 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
395 #include <AvailabilityMacros.h>
396 #undef DEPRECATED_ATTRIBUTE
397 #define DEPRECATED_ATTRIBUTE
398 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
399 #endif
400 #include <openssl/ssl.h>
401 #include <openssl/err.h>
402 #endif
404 #ifdef HAVE_SYSINFO
405 # include <sys/sysinfo.h>
406 #endif
408 /* On most systems <netdb.h> would have given us this, but
409 * not on some systems (e.g. z/OS).
411 #ifndef NI_MAXHOST
412 #define NI_MAXHOST 1025
413 #endif
415 #ifndef NI_MAXSERV
416 #define NI_MAXSERV 32
417 #endif
419 /* On most systems <limits.h> would have given us this, but
420 * not on some systems (e.g. GNU/Hurd).
422 #ifndef PATH_MAX
423 #define PATH_MAX 4096
424 #endif
426 #ifndef NAME_MAX
427 #define NAME_MAX 255
428 #endif
430 typedef uintmax_t timestamp_t;
431 #define PRItime PRIuMAX
432 #define parse_timestamp strtoumax
433 #define TIME_MAX UINTMAX_MAX
434 #define TIME_MIN 0
436 #ifndef PATH_SEP
437 #define PATH_SEP ':'
438 #endif
440 #ifdef HAVE_PATHS_H
441 #include <paths.h>
442 #endif
443 #ifndef _PATH_DEFPATH
444 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
445 #endif
447 #ifndef platform_core_config
448 struct config_context;
449 static inline int noop_core_config(const char *var UNUSED,
450 const char *value UNUSED,
451 const struct config_context *ctx UNUSED,
452 void *cb UNUSED)
454 return 0;
456 #define platform_core_config noop_core_config
457 #endif
459 int lstat_cache_aware_rmdir(const char *path);
460 #if !defined(__MINGW32__) && !defined(_MSC_VER)
461 #define rmdir lstat_cache_aware_rmdir
462 #endif
464 #ifndef has_dos_drive_prefix
465 static inline int git_has_dos_drive_prefix(const char *path UNUSED)
467 return 0;
469 #define has_dos_drive_prefix git_has_dos_drive_prefix
470 #endif
472 #ifndef skip_dos_drive_prefix
473 static inline int git_skip_dos_drive_prefix(char **path UNUSED)
475 return 0;
477 #define skip_dos_drive_prefix git_skip_dos_drive_prefix
478 #endif
480 static inline int git_is_dir_sep(int c)
482 return c == '/';
484 #ifndef is_dir_sep
485 #define is_dir_sep git_is_dir_sep
486 #endif
488 #ifndef offset_1st_component
489 static inline int git_offset_1st_component(const char *path)
491 return is_dir_sep(path[0]);
493 #define offset_1st_component git_offset_1st_component
494 #endif
496 #ifndef is_valid_path
497 #define is_valid_path(path) 1
498 #endif
500 #ifndef is_path_owned_by_current_user
502 #ifdef __TANDEM
503 #define ROOT_UID 65535
504 #else
505 #define ROOT_UID 0
506 #endif
509 * Do not use this function when
510 * (1) geteuid() did not say we are running as 'root', or
511 * (2) using this function will compromise the system.
513 * PORTABILITY WARNING:
514 * This code assumes uid_t is unsigned because that is what sudo does.
515 * If your uid_t type is signed and all your ids are positive then it
516 * should all work fine.
517 * If your version of sudo uses negative values for uid_t or it is
518 * buggy and return an overflowed value in SUDO_UID, then git might
519 * fail to grant access to your repository properly or even mistakenly
520 * grant access to someone else.
521 * In the unlikely scenario this happened to you, and that is how you
522 * got to this message, we would like to know about it; so sent us an
523 * email to git@vger.kernel.org indicating which platform you are
524 * using and which version of sudo, so we can improve this logic and
525 * maybe provide you with a patch that would prevent this issue again
526 * in the future.
528 static inline void extract_id_from_env(const char *env, uid_t *id)
530 const char *real_uid = getenv(env);
532 /* discard anything empty to avoid a more complex check below */
533 if (real_uid && *real_uid) {
534 char *endptr = NULL;
535 unsigned long env_id;
537 errno = 0;
538 /* silent overflow errors could trigger a bug here */
539 env_id = strtoul(real_uid, &endptr, 10);
540 if (!*endptr && !errno)
541 *id = env_id;
545 static inline int is_path_owned_by_current_uid(const char *path,
546 struct strbuf *report UNUSED)
548 struct stat st;
549 uid_t euid;
551 if (lstat(path, &st))
552 return 0;
554 euid = geteuid();
555 if (euid == ROOT_UID)
557 if (st.st_uid == ROOT_UID)
558 return 1;
559 else
560 extract_id_from_env("SUDO_UID", &euid);
563 return st.st_uid == euid;
566 #define is_path_owned_by_current_user is_path_owned_by_current_uid
567 #endif
569 #ifndef find_last_dir_sep
570 static inline char *git_find_last_dir_sep(const char *path)
572 return strrchr(path, '/');
574 #define find_last_dir_sep git_find_last_dir_sep
575 #endif
577 #ifndef has_dir_sep
578 static inline int git_has_dir_sep(const char *path)
580 return !!strchr(path, '/');
582 #define has_dir_sep(path) git_has_dir_sep(path)
583 #endif
585 #ifndef query_user_email
586 #define query_user_email() NULL
587 #endif
589 #ifdef __TANDEM
590 #include <floss.h(floss_execl,floss_execlp,floss_execv,floss_execvp)>
591 #include <floss.h(floss_getpwuid)>
592 #ifndef NSIG
594 * NonStop NSE and NSX do not provide NSIG. SIGGUARDIAN(99) is the highest
595 * known, by detective work using kill -l as a list is all signals
596 * instead of signal.h where it should be.
598 # define NSIG 100
599 #endif
600 #endif
602 #if defined(__HP_cc) && (__HP_cc >= 61000)
603 #define NORETURN __attribute__((noreturn))
604 #define NORETURN_PTR
605 #elif defined(__GNUC__) && !defined(NO_NORETURN)
606 #define NORETURN __attribute__((__noreturn__))
607 #define NORETURN_PTR __attribute__((__noreturn__))
608 #elif defined(_MSC_VER)
609 #define NORETURN __declspec(noreturn)
610 #define NORETURN_PTR
611 #else
612 #define NORETURN
613 #define NORETURN_PTR
614 #ifndef __GNUC__
615 #ifndef __attribute__
616 #define __attribute__(x)
617 #endif
618 #endif
619 #endif
621 /* The sentinel attribute is valid from gcc version 4.0 */
622 #if defined(__GNUC__) && (__GNUC__ >= 4)
623 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
624 /* warn_unused_result exists as of gcc 3.4.0, but be lazy and check 4.0 */
625 #define RESULT_MUST_BE_USED __attribute__ ((warn_unused_result))
626 #else
627 #define LAST_ARG_MUST_BE_NULL
628 #define RESULT_MUST_BE_USED
629 #endif
631 #define MAYBE_UNUSED __attribute__((__unused__))
633 #include "compat/bswap.h"
635 #include "wrapper.h"
637 /* General helper functions */
638 NORETURN void usage(const char *err);
639 NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
640 NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
641 NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
642 int die_message(const char *err, ...) __attribute__((format (printf, 1, 2)));
643 int die_message_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
644 int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
645 int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
646 void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
647 void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
649 #ifndef NO_OPENSSL
650 #ifdef APPLE_COMMON_CRYPTO
651 #include "compat/apple-common-crypto.h"
652 #else
653 #include <openssl/evp.h>
654 #include <openssl/hmac.h>
655 #endif /* APPLE_COMMON_CRYPTO */
656 #include <openssl/x509v3.h>
657 #endif /* NO_OPENSSL */
659 #ifdef HAVE_OPENSSL_CSPRNG
660 #include <openssl/rand.h>
661 #endif
664 * Let callers be aware of the constant return value; this can help
665 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
666 * because other compilers may be confused by this.
668 #if defined(__GNUC__)
669 static inline int const_error(void)
671 return -1;
673 #define error(...) (error(__VA_ARGS__), const_error())
674 #define error_errno(...) (error_errno(__VA_ARGS__), const_error())
675 #endif
677 typedef void (*report_fn)(const char *, va_list params);
679 void set_die_routine(NORETURN_PTR report_fn routine);
680 report_fn get_die_message_routine(void);
681 void set_error_routine(report_fn routine);
682 report_fn get_error_routine(void);
683 void set_warn_routine(report_fn routine);
684 report_fn get_warn_routine(void);
685 void set_die_is_recursing_routine(int (*routine)(void));
688 * If the string "str" begins with the string found in "prefix", return true.
689 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
690 * the string right after the prefix).
692 * Otherwise, return false and leave "out" untouched.
694 * Examples:
696 * [extract branch name, fail if not a branch]
697 * if (!skip_prefix(ref, "refs/heads/", &branch)
698 * return -1;
700 * [skip prefix if present, otherwise use whole string]
701 * skip_prefix(name, "refs/heads/", &name);
703 static inline bool skip_prefix(const char *str, const char *prefix,
704 const char **out)
706 do {
707 if (!*prefix) {
708 *out = str;
709 return true;
711 } while (*str++ == *prefix++);
712 return false;
716 * Like skip_prefix, but promises never to read past "len" bytes of the input
717 * buffer, and returns the remaining number of bytes in "out" via "outlen".
719 static inline bool skip_prefix_mem(const char *buf, size_t len,
720 const char *prefix,
721 const char **out, size_t *outlen)
723 size_t prefix_len = strlen(prefix);
724 if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
725 *out = buf + prefix_len;
726 *outlen = len - prefix_len;
727 return true;
729 return false;
733 * If buf ends with suffix, return true and subtract the length of the suffix
734 * from *len. Otherwise, return false and leave *len untouched.
736 static inline bool strip_suffix_mem(const char *buf, size_t *len,
737 const char *suffix)
739 size_t suflen = strlen(suffix);
740 if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
741 return false;
742 *len -= suflen;
743 return true;
747 * If str ends with suffix, return true and set *len to the size of the string
748 * without the suffix. Otherwise, return false and set *len to the size of the
749 * string.
751 * Note that we do _not_ NUL-terminate str to the new length.
753 static inline bool strip_suffix(const char *str, const char *suffix,
754 size_t *len)
756 *len = strlen(str);
757 return strip_suffix_mem(str, len, suffix);
760 #define SWAP(a, b) do { \
761 void *_swap_a_ptr = &(a); \
762 void *_swap_b_ptr = &(b); \
763 unsigned char _swap_buffer[sizeof(a)]; \
764 memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \
765 memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) + \
766 BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b))); \
767 memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \
768 } while (0)
770 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
772 #ifndef PROT_READ
773 #define PROT_READ 1
774 #define PROT_WRITE 2
775 #define MAP_PRIVATE 1
776 #endif
778 #define mmap git_mmap
779 #define munmap git_munmap
780 void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
781 int git_munmap(void *start, size_t length);
783 #else /* NO_MMAP || USE_WIN32_MMAP */
785 #include <sys/mman.h>
787 #endif /* NO_MMAP || USE_WIN32_MMAP */
789 #ifdef NO_MMAP
791 /* This value must be multiple of (pagesize * 2) */
792 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
794 #else /* NO_MMAP */
796 /* This value must be multiple of (pagesize * 2) */
797 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
798 (sizeof(void*) >= 8 \
799 ? 1 * 1024 * 1024 * 1024 \
800 : 32 * 1024 * 1024)
802 #endif /* NO_MMAP */
804 #ifndef MAP_FAILED
805 #define MAP_FAILED ((void *)-1)
806 #endif
808 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
809 #define on_disk_bytes(st) ((st).st_size)
810 #else
811 #define on_disk_bytes(st) ((st).st_blocks * 512)
812 #endif
814 #ifdef NEEDS_MODE_TRANSLATION
815 #undef S_IFMT
816 #undef S_IFREG
817 #undef S_IFDIR
818 #undef S_IFLNK
819 #undef S_IFBLK
820 #undef S_IFCHR
821 #undef S_IFIFO
822 #undef S_IFSOCK
823 #define S_IFMT 0170000
824 #define S_IFREG 0100000
825 #define S_IFDIR 0040000
826 #define S_IFLNK 0120000
827 #define S_IFBLK 0060000
828 #define S_IFCHR 0020000
829 #define S_IFIFO 0010000
830 #define S_IFSOCK 0140000
831 #ifdef stat
832 #undef stat
833 #endif
834 #define stat(path, buf) git_stat(path, buf)
835 int git_stat(const char *, struct stat *);
836 #ifdef fstat
837 #undef fstat
838 #endif
839 #define fstat(fd, buf) git_fstat(fd, buf)
840 int git_fstat(int, struct stat *);
841 #ifdef lstat
842 #undef lstat
843 #endif
844 #define lstat(path, buf) git_lstat(path, buf)
845 int git_lstat(const char *, struct stat *);
846 #endif
848 #define DEFAULT_PACKED_GIT_LIMIT \
849 ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
851 #ifdef NO_PREAD
852 #define pread git_pread
853 ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
854 #endif
856 #ifdef NO_SETENV
857 #define setenv gitsetenv
858 int gitsetenv(const char *, const char *, int);
859 #endif
861 #ifdef NO_MKDTEMP
862 #define mkdtemp gitmkdtemp
863 char *gitmkdtemp(char *);
864 #endif
866 #ifdef NO_UNSETENV
867 #define unsetenv gitunsetenv
868 int gitunsetenv(const char *);
869 #endif
871 #ifdef NO_STRCASESTR
872 #define strcasestr gitstrcasestr
873 char *gitstrcasestr(const char *haystack, const char *needle);
874 #endif
876 #ifdef NO_STRLCPY
877 #define strlcpy gitstrlcpy
878 size_t gitstrlcpy(char *, const char *, size_t);
879 #endif
881 #ifdef NO_STRTOUMAX
882 #define strtoumax gitstrtoumax
883 uintmax_t gitstrtoumax(const char *, char **, int);
884 #define strtoimax gitstrtoimax
885 intmax_t gitstrtoimax(const char *, char **, int);
886 #endif
888 #ifdef NO_HSTRERROR
889 #define hstrerror githstrerror
890 const char *githstrerror(int herror);
891 #endif
893 #ifdef NO_MEMMEM
894 #define memmem gitmemmem
895 void *gitmemmem(const void *haystack, size_t haystacklen,
896 const void *needle, size_t needlelen);
897 #endif
899 #ifdef OVERRIDE_STRDUP
900 #ifdef strdup
901 #undef strdup
902 #endif
903 #define strdup gitstrdup
904 char *gitstrdup(const char *s);
905 #endif
907 #ifdef NO_GETPAGESIZE
908 #define getpagesize() sysconf(_SC_PAGESIZE)
909 #endif
911 #ifndef O_CLOEXEC
912 #define O_CLOEXEC 0
913 #endif
915 #ifdef FREAD_READS_DIRECTORIES
916 # if !defined(SUPPRESS_FOPEN_REDEFINITION)
917 # ifdef fopen
918 # undef fopen
919 # endif
920 # define fopen(a,b) git_fopen(a,b)
921 # endif
922 FILE *git_fopen(const char*, const char*);
923 #endif
925 #ifdef SNPRINTF_RETURNS_BOGUS
926 #ifdef snprintf
927 #undef snprintf
928 #endif
929 #define snprintf git_snprintf
930 int git_snprintf(char *str, size_t maxsize,
931 const char *format, ...);
932 #ifdef vsnprintf
933 #undef vsnprintf
934 #endif
935 #define vsnprintf git_vsnprintf
936 int git_vsnprintf(char *str, size_t maxsize,
937 const char *format, va_list ap);
938 #endif
940 #ifdef OPEN_RETURNS_EINTR
941 #undef open
942 #define open git_open_with_retry
943 int git_open_with_retry(const char *path, int flag, ...);
944 #endif
946 #ifdef __GLIBC_PREREQ
947 #if __GLIBC_PREREQ(2, 1)
948 #define HAVE_STRCHRNUL
949 #endif
950 #endif
952 #ifndef HAVE_STRCHRNUL
953 #define strchrnul gitstrchrnul
954 static inline char *gitstrchrnul(const char *s, int c)
956 while (*s && *s != c)
957 s++;
958 return (char *)s;
960 #endif
962 #ifdef NO_INET_PTON
963 int inet_pton(int af, const char *src, void *dst);
964 #endif
966 #ifdef NO_INET_NTOP
967 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
968 #endif
970 #ifdef NO_PTHREADS
971 #define atexit git_atexit
972 int git_atexit(void (*handler)(void));
973 #endif
975 static inline size_t st_add(size_t a, size_t b)
977 if (unsigned_add_overflows(a, b))
978 die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
979 (uintmax_t)a, (uintmax_t)b);
980 return a + b;
982 #define st_add3(a,b,c) st_add(st_add((a),(b)),(c))
983 #define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
985 static inline size_t st_mult(size_t a, size_t b)
987 if (unsigned_mult_overflows(a, b))
988 die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
989 (uintmax_t)a, (uintmax_t)b);
990 return a * b;
993 static inline size_t st_sub(size_t a, size_t b)
995 if (a < b)
996 die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
997 (uintmax_t)a, (uintmax_t)b);
998 return a - b;
1001 static inline size_t st_left_shift(size_t a, unsigned shift)
1003 if (unsigned_left_shift_overflows(a, shift))
1004 die("size_t overflow: %"PRIuMAX" << %u",
1005 (uintmax_t)a, shift);
1006 return a << shift;
1009 static inline unsigned long cast_size_t_to_ulong(size_t a)
1011 if (a != (unsigned long)a)
1012 die("object too large to read on this platform: %"
1013 PRIuMAX" is cut off to %lu",
1014 (uintmax_t)a, (unsigned long)a);
1015 return (unsigned long)a;
1018 static inline uint32_t cast_size_t_to_uint32_t(size_t a)
1020 if (a != (uint32_t)a)
1021 die("object too large to read on this platform: %"
1022 PRIuMAX" is cut off to %u",
1023 (uintmax_t)a, (uint32_t)a);
1024 return (uint32_t)a;
1027 static inline int cast_size_t_to_int(size_t a)
1029 if (a > INT_MAX)
1030 die("number too large to represent as int on this platform: %"PRIuMAX,
1031 (uintmax_t)a);
1032 return (int)a;
1036 * Limit size of IO chunks, because huge chunks only cause pain. OS X
1037 * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in
1038 * the absence of bugs, large chunks can result in bad latencies when
1039 * you decide to kill the process.
1041 * We pick 8 MiB as our default, but if the platform defines SSIZE_MAX
1042 * that is smaller than that, clip it to SSIZE_MAX, as a call to
1043 * read(2) or write(2) larger than that is allowed to fail. As the last
1044 * resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value"
1045 * to override this, if the definition of SSIZE_MAX given by the platform
1046 * is broken.
1048 #ifndef MAX_IO_SIZE
1049 # define MAX_IO_SIZE_DEFAULT (8*1024*1024)
1050 # if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT)
1051 # define MAX_IO_SIZE SSIZE_MAX
1052 # else
1053 # define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT
1054 # endif
1055 #endif
1057 #ifdef HAVE_ALLOCA_H
1058 # include <alloca.h>
1059 # define xalloca(size) (alloca(size))
1060 # define xalloca_free(p) do {} while (0)
1061 #else
1062 # define xalloca(size) (xmalloc(size))
1063 # define xalloca_free(p) (free(p))
1064 #endif
1067 * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
1068 * that ptr is used twice, so don't pass e.g. ptr++.
1070 #define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
1072 #define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
1073 #define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x)))
1074 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
1076 #define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
1077 BARF_UNLESS_COPYABLE((dst), (src)))
1078 static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
1080 if (n)
1081 memcpy(dst, src, st_mult(size, n));
1084 #define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
1085 BARF_UNLESS_COPYABLE((dst), (src)))
1086 static inline void move_array(void *dst, const void *src, size_t n, size_t size)
1088 if (n)
1089 memmove(dst, src, st_mult(size, n));
1092 #define DUP_ARRAY(dst, src, n) do { \
1093 size_t dup_array_n_ = (n); \
1094 COPY_ARRAY(ALLOC_ARRAY((dst), dup_array_n_), (src), dup_array_n_); \
1095 } while (0)
1098 * These functions help you allocate structs with flex arrays, and copy
1099 * the data directly into the array. For example, if you had:
1101 * struct foo {
1102 * int bar;
1103 * char name[FLEX_ARRAY];
1104 * };
1106 * you can do:
1108 * struct foo *f;
1109 * FLEX_ALLOC_MEM(f, name, src, len);
1111 * to allocate a "foo" with the contents of "src" in the "name" field.
1112 * The resulting struct is automatically zero'd, and the flex-array field
1113 * is NUL-terminated (whether the incoming src buffer was or not).
1115 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
1116 * but do want to store a pointer to some extra data in the same allocated
1117 * block. For example, if you have:
1119 * struct foo {
1120 * char *name;
1121 * int bar;
1122 * };
1124 * you can do:
1126 * struct foo *f;
1127 * FLEXPTR_ALLOC_STR(f, name, src);
1129 * and "name" will point to a block of memory after the struct, which will be
1130 * freed along with the struct (but the pointer can be repointed anywhere).
1132 * The *_STR variants accept a string parameter rather than a ptr/len
1133 * combination.
1135 * Note that these macros will evaluate the first parameter multiple
1136 * times, and it must be assignable as an lvalue.
1138 #define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
1139 size_t flex_array_len_ = (len); \
1140 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
1141 memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
1142 } while (0)
1143 #define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
1144 size_t flex_array_len_ = (len); \
1145 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
1146 memcpy((x) + 1, (buf), flex_array_len_); \
1147 (x)->ptrname = (void *)((x)+1); \
1148 } while(0)
1149 #define FLEX_ALLOC_STR(x, flexname, str) \
1150 FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
1151 #define FLEXPTR_ALLOC_STR(x, ptrname, str) \
1152 FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
1154 #define alloc_nr(x) (((x)+16)*3/2)
1157 * Dynamically growing an array using realloc() is error prone and boring.
1159 * Define your array with:
1161 * - a pointer (`item`) that points at the array, initialized to `NULL`
1162 * (although please name the variable based on its contents, not on its
1163 * type);
1165 * - an integer variable (`alloc`) that keeps track of how big the current
1166 * allocation is, initialized to `0`;
1168 * - another integer variable (`nr`) to keep track of how many elements the
1169 * array currently has, initialized to `0`.
1171 * Then before adding `n`th element to the item, call `ALLOC_GROW(item, n,
1172 * alloc)`. This ensures that the array can hold at least `n` elements by
1173 * calling `realloc(3)` and adjusting `alloc` variable.
1175 * ------------
1176 * sometype *item;
1177 * size_t nr;
1178 * size_t alloc
1180 * for (i = 0; i < nr; i++)
1181 * if (we like item[i] already)
1182 * return;
1184 * // we did not like any existing one, so add one
1185 * ALLOC_GROW(item, nr + 1, alloc);
1186 * item[nr++] = value you like;
1187 * ------------
1189 * You are responsible for updating the `nr` variable.
1191 * If you need to specify the number of elements to allocate explicitly
1192 * then use the macro `REALLOC_ARRAY(item, alloc)` instead of `ALLOC_GROW`.
1194 * Consider using ALLOC_GROW_BY instead of ALLOC_GROW as it has some
1195 * added niceties.
1197 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
1199 #define ALLOC_GROW(x, nr, alloc) \
1200 do { \
1201 if ((nr) > alloc) { \
1202 if (alloc_nr(alloc) < (nr)) \
1203 alloc = (nr); \
1204 else \
1205 alloc = alloc_nr(alloc); \
1206 REALLOC_ARRAY(x, alloc); \
1208 } while (0)
1211 * Similar to ALLOC_GROW but handles updating of the nr value and
1212 * zeroing the bytes of the newly-grown array elements.
1214 * DO NOT USE any expression with side-effect for any of the
1215 * arguments.
1217 #define ALLOC_GROW_BY(x, nr, increase, alloc) \
1218 do { \
1219 if (increase) { \
1220 size_t new_nr = nr + (increase); \
1221 if (new_nr < nr) \
1222 BUG("negative growth in ALLOC_GROW_BY"); \
1223 ALLOC_GROW(x, new_nr, alloc); \
1224 memset((x) + nr, 0, sizeof(*(x)) * (increase)); \
1225 nr = new_nr; \
1227 } while (0)
1229 static inline char *xstrdup_or_null(const char *str)
1231 return str ? xstrdup(str) : NULL;
1234 static inline size_t xsize_t(off_t len)
1236 if (len < 0 || (uintmax_t) len > SIZE_MAX)
1237 die("Cannot handle files this big");
1238 return (size_t) len;
1241 #ifndef HOST_NAME_MAX
1242 #define HOST_NAME_MAX 256
1243 #endif
1245 #include "sane-ctype.h"
1248 * Like skip_prefix, but compare case-insensitively. Note that the comparison
1249 * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1250 * locale-specific conversions).
1252 static inline int skip_iprefix(const char *str, const char *prefix,
1253 const char **out)
1255 do {
1256 if (!*prefix) {
1257 *out = str;
1258 return 1;
1260 } while (tolower(*str++) == tolower(*prefix++));
1261 return 0;
1265 * Like skip_prefix_mem, but compare case-insensitively. Note that the
1266 * comparison is done via tolower(), so it is strictly ASCII (no multi-byte
1267 * characters or locale-specific conversions).
1269 static inline int skip_iprefix_mem(const char *buf, size_t len,
1270 const char *prefix,
1271 const char **out, size_t *outlen)
1273 do {
1274 if (!*prefix) {
1275 *out = buf;
1276 *outlen = len;
1277 return 1;
1279 } while (len-- > 0 && tolower(*buf++) == tolower(*prefix++));
1280 return 0;
1283 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
1285 unsigned long ul;
1286 char *p;
1288 errno = 0;
1289 /* negative values would be accepted by strtoul */
1290 if (strchr(s, '-'))
1291 return -1;
1292 ul = strtoul(s, &p, base);
1293 if (errno || *p || p == s || (unsigned int) ul != ul)
1294 return -1;
1295 *result = ul;
1296 return 0;
1299 static inline int strtol_i(char const *s, int base, int *result)
1301 long ul;
1302 char *p;
1304 errno = 0;
1305 ul = strtol(s, &p, base);
1306 if (errno || *p || p == s || (int) ul != ul)
1307 return -1;
1308 *result = ul;
1309 return 0;
1312 void git_stable_qsort(void *base, size_t nmemb, size_t size,
1313 int(*compar)(const void *, const void *));
1314 #ifdef INTERNAL_QSORT
1315 #define qsort git_stable_qsort
1316 #endif
1318 #define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1319 static inline void sane_qsort(void *base, size_t nmemb, size_t size,
1320 int(*compar)(const void *, const void *))
1322 if (nmemb > 1)
1323 qsort(base, nmemb, size, compar);
1326 #define STABLE_QSORT(base, n, compar) \
1327 git_stable_qsort((base), (n), sizeof(*(base)), compar)
1329 #ifndef HAVE_ISO_QSORT_S
1330 int git_qsort_s(void *base, size_t nmemb, size_t size,
1331 int (*compar)(const void *, const void *, void *), void *ctx);
1332 #define qsort_s git_qsort_s
1333 #endif
1335 #define QSORT_S(base, n, compar, ctx) do { \
1336 if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1337 BUG("qsort_s() failed"); \
1338 } while (0)
1340 #ifndef REG_STARTEND
1341 #error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1342 #endif
1344 static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1345 size_t nmatch, regmatch_t pmatch[], int eflags)
1347 assert(nmatch > 0 && pmatch);
1348 pmatch[0].rm_so = 0;
1349 pmatch[0].rm_eo = size;
1350 return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1353 #ifdef USE_ENHANCED_BASIC_REGULAR_EXPRESSIONS
1354 int git_regcomp(regex_t *preg, const char *pattern, int cflags);
1355 #define regcomp git_regcomp
1356 #endif
1358 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1359 # define FORCE_DIR_SET_GID S_ISGID
1360 #else
1361 # define FORCE_DIR_SET_GID 0
1362 #endif
1364 #ifdef NO_NSEC
1365 #undef USE_NSEC
1366 #define ST_CTIME_NSEC(st) 0
1367 #define ST_MTIME_NSEC(st) 0
1368 #else
1369 #ifdef USE_ST_TIMESPEC
1370 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1371 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1372 #else
1373 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1374 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1375 #endif
1376 #endif
1378 #ifdef UNRELIABLE_FSTAT
1379 #define fstat_is_reliable() 0
1380 #else
1381 #define fstat_is_reliable() 1
1382 #endif
1384 #ifndef va_copy
1386 * Since an obvious implementation of va_list would be to make it a
1387 * pointer into the stack frame, a simple assignment will work on
1388 * many systems. But let's try to be more portable.
1390 #ifdef __va_copy
1391 #define va_copy(dst, src) __va_copy(dst, src)
1392 #else
1393 #define va_copy(dst, src) ((dst) = (src))
1394 #endif
1395 #endif
1397 /* usage.c: only to be used for testing BUG() implementation (see test-tool) */
1398 extern int BUG_exit_code;
1400 /* usage.c: if bug() is called we should have a BUG_if_bug() afterwards */
1401 extern int bug_called_must_BUG;
1403 __attribute__((format (printf, 3, 4))) NORETURN
1404 void BUG_fl(const char *file, int line, const char *fmt, ...);
1405 #define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1406 __attribute__((format (printf, 3, 4)))
1407 void bug_fl(const char *file, int line, const char *fmt, ...);
1408 #define bug(...) bug_fl(__FILE__, __LINE__, __VA_ARGS__)
1409 #define BUG_if_bug(...) do { \
1410 if (bug_called_must_BUG) \
1411 BUG_fl(__FILE__, __LINE__, __VA_ARGS__); \
1412 } while (0)
1414 #ifndef FSYNC_METHOD_DEFAULT
1415 #ifdef __APPLE__
1416 #define FSYNC_METHOD_DEFAULT FSYNC_METHOD_WRITEOUT_ONLY
1417 #else
1418 #define FSYNC_METHOD_DEFAULT FSYNC_METHOD_FSYNC
1419 #endif
1420 #endif
1422 #ifndef SHELL_PATH
1423 # define SHELL_PATH "/bin/sh"
1424 #endif
1426 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1427 static inline void git_flockfile(FILE *fh UNUSED)
1429 ; /* nothing */
1431 static inline void git_funlockfile(FILE *fh UNUSED)
1433 ; /* nothing */
1435 #undef flockfile
1436 #undef funlockfile
1437 #undef getc_unlocked
1438 #define flockfile(fh) git_flockfile(fh)
1439 #define funlockfile(fh) git_funlockfile(fh)
1440 #define getc_unlocked(fh) getc(fh)
1441 #endif
1443 #ifdef FILENO_IS_A_MACRO
1444 int git_fileno(FILE *stream);
1445 # ifndef COMPAT_CODE_FILENO
1446 # undef fileno
1447 # define fileno(p) git_fileno(p)
1448 # endif
1449 #endif
1451 #ifdef NEED_ACCESS_ROOT_HANDLER
1452 int git_access(const char *path, int mode);
1453 # ifndef COMPAT_CODE_ACCESS
1454 # ifdef access
1455 # undef access
1456 # endif
1457 # define access(path, mode) git_access(path, mode)
1458 # endif
1459 #endif
1462 * Our code often opens a path to an optional file, to work on its
1463 * contents when we can successfully open it. We can ignore a failure
1464 * to open if such an optional file does not exist, but we do want to
1465 * report a failure in opening for other reasons (e.g. we got an I/O
1466 * error, or the file is there, but we lack the permission to open).
1468 * Call this function after seeing an error from open() or fopen() to
1469 * see if the errno indicates a missing file that we can safely ignore.
1471 static inline int is_missing_file_error(int errno_)
1473 return (errno_ == ENOENT || errno_ == ENOTDIR);
1476 int cmd_main(int, const char **);
1479 * Intercept all calls to exit() and route them to trace2 to
1480 * optionally emit a message before calling the real exit().
1482 int common_exit(const char *file, int line, int code);
1483 #define exit(code) exit(common_exit(__FILE__, __LINE__, (code)))
1486 * You can mark a stack variable with UNLEAK(var) to avoid it being
1487 * reported as a leak by tools like LSAN or valgrind. The argument
1488 * should generally be the variable itself (not its address and not what
1489 * it points to). It's safe to use this on pointers which may already
1490 * have been freed, or on pointers which may still be in use.
1492 * Use this _only_ for a variable that leaks by going out of scope at
1493 * program exit (so only from cmd_* functions or their direct helpers).
1494 * Normal functions, especially those which may be called multiple
1495 * times, should actually free their memory. This is only meant as
1496 * an annotation, and does nothing in non-leak-checking builds.
1498 #ifdef SUPPRESS_ANNOTATED_LEAKS
1499 void unleak_memory(const void *ptr, size_t len);
1500 #define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1501 #else
1502 #define UNLEAK(var) do {} while (0)
1503 #endif
1505 #define z_const
1506 #include <zlib.h>
1508 #if ZLIB_VERNUM < 0x1290
1510 * This is uncompress2, which is only available in zlib >= 1.2.9
1511 * (released as of early 2017). See compat/zlib-uncompress2.c.
1513 int uncompress2(Bytef *dest, uLongf *destLen, const Bytef *source,
1514 uLong *sourceLen);
1515 #endif
1518 * This include must come after system headers, since it introduces macros that
1519 * replace system names.
1521 #include "banned.h"
1524 * container_of - Get the address of an object containing a field.
1526 * @ptr: pointer to the field.
1527 * @type: type of the object.
1528 * @member: name of the field within the object.
1530 #define container_of(ptr, type, member) \
1531 ((type *) ((char *)(ptr) - offsetof(type, member)))
1534 * helper function for `container_of_or_null' to avoid multiple
1535 * evaluation of @ptr
1537 static inline void *container_of_or_null_offset(void *ptr, size_t offset)
1539 return ptr ? (char *)ptr - offset : NULL;
1543 * like `container_of', but allows returned value to be NULL
1545 #define container_of_or_null(ptr, type, member) \
1546 (type *)container_of_or_null_offset(ptr, offsetof(type, member))
1549 * like offsetof(), but takes a pointer to a variable of type which
1550 * contains @member, instead of a specified type.
1551 * @ptr is subject to multiple evaluation since we can't rely on __typeof__
1552 * everywhere.
1554 #if defined(__GNUC__) /* clang sets this, too */
1555 #define OFFSETOF_VAR(ptr, member) offsetof(__typeof__(*ptr), member)
1556 #else /* !__GNUC__ */
1557 #define OFFSETOF_VAR(ptr, member) \
1558 ((uintptr_t)&(ptr)->member - (uintptr_t)(ptr))
1559 #endif /* !__GNUC__ */
1561 #endif