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git-compat-util.h
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#ifndef GIT_COMPAT_UTIL_H
#define GIT_COMPAT_UTIL_H
#if __STDC_VERSION__ - 0 < 199901L
/*
* Git is in a testing period for mandatory C99 support in the compiler. If
* your compiler is reasonably recent, you can try to enable C99 support (or,
* for MSVC, C11 support). If you encounter a problem and can't enable C99
* support with your compiler (such as with "-std=gnu99") and don't have access
* to one with this support, such as GCC or Clang, you can remove this #if
* directive, but please report the details of your system to
*/
#error "Required C99 support is in a test phase. Please see git-compat-util.h for more details."
#endif
#ifdef USE_MSVC_CRTDBG
/*
* For these to work they must appear very early in each
* file -- before most of the standard header files.
*/
#include <stdlib.h>
#include <crtdbg.h>
#endif
struct strbuf;
#define _FILE_OFFSET_BITS 64
/* Derived from Linux "Features Test Macro" header
* Convenience macros to test the versions of gcc (or
* a compatible compiler).
* Use them like this:
* #if GIT_GNUC_PREREQ (2,8)
* ... code requiring gcc 2.8 or later ...
* #endif
*/
#if defined(__GNUC__) && defined(__GNUC_MINOR__)
# define GIT_GNUC_PREREQ(maj, min) \
((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
#define GIT_GNUC_PREREQ(maj, min) 0
#endif
#ifndef FLEX_ARRAY
/*
* See if our compiler is known to support flexible array members.
*/
/*
* Check vendor specific quirks first, before checking the
* __STDC_VERSION__, as vendor compilers can lie and we need to be
* able to work them around. Note that by not defining FLEX_ARRAY
* here, we can fall back to use the "safer but a bit wasteful" one
* later.
*/
#if defined(__SUNPRO_C) && (__SUNPRO_C <= 0x580)
#elif defined(__GNUC__)
# if (__GNUC__ >= 3)
# define FLEX_ARRAY /* empty */
# else
# define FLEX_ARRAY 0 /* older GNU extension */
# endif
#elif defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# define FLEX_ARRAY /* empty */
#endif
/*
* Otherwise, default to safer but a bit wasteful traditional style
*/
#ifndef FLEX_ARRAY
# define FLEX_ARRAY 1
#endif
#endif
/*
* BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
* @cond: the compile-time condition which must be true.
*
* Your compile will fail if the condition isn't true, or can't be evaluated
* by the compiler. This can be used in an expression: its value is "0".
*
* Example:
* #define foo_to_char(foo) \
* ((char *)(foo) \
* + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
*/
#define BUILD_ASSERT_OR_ZERO(cond) \
(sizeof(char [1 - 2*!(cond)]) - 1)
#if GIT_GNUC_PREREQ(3, 1)
/* &arr[0] degrades to a pointer: a different type from an array */
# define BARF_UNLESS_AN_ARRAY(arr) \
BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
__typeof__(&(arr)[0])))
# define BARF_UNLESS_COPYABLE(dst, src) \
BUILD_ASSERT_OR_ZERO(__builtin_types_compatible_p(__typeof__(*(dst)), \
__typeof__(*(src))))
#else
# define BARF_UNLESS_AN_ARRAY(arr) 0
# define BARF_UNLESS_COPYABLE(dst, src) \
BUILD_ASSERT_OR_ZERO(0 ? ((*(dst) = *(src)), 0) : \
sizeof(*(dst)) == sizeof(*(src)))
#endif
/*
* ARRAY_SIZE - get the number of elements in a visible array
* @x: the array whose size you want.
*
* This does not work on pointers, or arrays declared as [], or
* function parameters. With correct compiler support, such usage
* will cause a build error (see the build_assert_or_zero macro).
*/
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
#define bitsizeof(x) (CHAR_BIT * sizeof(x))
#define maximum_signed_value_of_type(a) \
(INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
#define maximum_unsigned_value_of_type(a) \
(UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
/*
* Signed integer overflow is undefined in C, so here's a helper macro
* to detect if the sum of two integers will overflow.
*
* Requires: a >= 0, typeof(a) equals typeof(b)
*/
#define signed_add_overflows(a, b) \
((b) > maximum_signed_value_of_type(a) - (a))
#define unsigned_add_overflows(a, b) \
((b) > maximum_unsigned_value_of_type(a) - (a))
/*
* Returns true if the multiplication of "a" and "b" will
* overflow. The types of "a" and "b" must match and must be unsigned.
* Note that this macro evaluates "a" twice!
*/
#define unsigned_mult_overflows(a, b) \
((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
/*
* Returns true if the left shift of "a" by "shift" bits will
* overflow. The type of "a" must be unsigned.
*/
#define unsigned_left_shift_overflows(a, shift) \
((shift) < bitsizeof(a) && \
(a) > maximum_unsigned_value_of_type(a) >> (shift))
#ifdef __GNUC__
#define TYPEOF(x) (__typeof__(x))
#else
#define TYPEOF(x)
#endif
#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
#define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
/* Approximation of the length of the decimal representation of this type. */
#define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
#ifdef __MINGW64__
#define _POSIX_C_SOURCE 1
#elif defined(__sun__)
/*
* On Solaris, when _XOPEN_EXTENDED is set, its header file
* forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
* setting to say we are XPG5 or XPG6. Also on Solaris,
* XPG6 programs must be compiled with a c99 compiler, while
* non XPG6 programs must be compiled with a pre-c99 compiler.
*/
# if __STDC_VERSION__ - 0 >= 199901L
# define _XOPEN_SOURCE 600
# else
# define _XOPEN_SOURCE 500
# endif
#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
!defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
!defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
!defined(__CYGWIN__)
#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
#endif
#define _ALL_SOURCE 1
#define _GNU_SOURCE 1
#define _BSD_SOURCE 1
#define _DEFAULT_SOURCE 1
#define _NETBSD_SOURCE 1
#define _SGI_SOURCE 1
/*
* UNUSED marks a function parameter that is always unused. It also
* can be used to annotate a function, a variable, or a type that is
* always unused.
*
* A callback interface may dictate that a function accepts a
* parameter at that position, but the implementation of the function
* may not need to use the parameter. In such a case, mark the parameter
* with UNUSED.
*
* When a parameter may be used or unused, depending on conditional
* compilation, consider using MAYBE_UNUSED instead.
*/
#if GIT_GNUC_PREREQ(4, 5)
#define UNUSED __attribute__((unused)) \
__attribute__((deprecated ("parameter declared as UNUSED")))
#elif defined(__GNUC__)
#define UNUSED __attribute__((unused)) \
__attribute__((deprecated))
#else
#define UNUSED
#endif
#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
# if !defined(_WIN32_WINNT)
# define _WIN32_WINNT 0x0600
# endif
#define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
#include <winsock2.h>
#ifndef NO_UNIX_SOCKETS
#include <afunix.h>
#endif
#include <windows.h>
#define GIT_WINDOWS_NATIVE
#endif
#if defined(NO_UNIX_SOCKETS) || !defined(GIT_WINDOWS_NATIVE)
static inline int _have_unix_sockets(void)
{
#if defined(NO_UNIX_SOCKETS)
return 0;
#else
return 1;
#endif
}
#define have_unix_sockets _have_unix_sockets
#endif
#include <unistd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
#include <strings.h> /* for strcasecmp() */
#endif
#include <errno.h>
#include <limits.h>
#include <locale.h>
#ifdef NEEDS_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <sys/types.h>
#include <dirent.h>
#include <sys/time.h>
#include <time.h>
#include <signal.h>
#include <assert.h>
#include <regex.h>
#include <utime.h>
#include <syslog.h>
#if !defined(NO_POLL_H)
#include <poll.h>
#elif !defined(NO_SYS_POLL_H)
#include <sys/poll.h>
#else
/* Pull the compat stuff */
#include <poll.h>
#endif
#ifdef HAVE_BSD_SYSCTL
#include <sys/sysctl.h>
#endif
/* Used by compat/win32/path-utils.h, and more */
static inline int is_xplatform_dir_sep(int c)
{
return c == '/' || c == '\\';
}
#if defined(__CYGWIN__)
#include "compat/win32/path-utils.h"
#endif
#if defined(__MINGW32__)
/* pull in Windows compatibility stuff */
#include "compat/win32/path-utils.h"
#include "compat/mingw.h"
#elif defined(_MSC_VER)
#include "compat/win32/path-utils.h"
#include "compat/msvc.h"
#else
#include <sys/utsname.h>
#include <sys/wait.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/statvfs.h>
#include <termios.h>
#ifndef NO_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <pwd.h>
#include <sys/un.h>
#ifndef NO_INTTYPES_H
#include <inttypes.h>
#else
#include <stdint.h>
#endif
#ifdef HAVE_ARC4RANDOM_LIBBSD
#include <bsd/stdlib.h>
#endif
#ifdef HAVE_GETRANDOM
#include <sys/random.h>
#endif
#ifdef NO_INTPTR_T
/*
* On I16LP32, ILP32 and LP64 "long" is the safe bet, however
* on LLP86, IL33LLP64 and P64 it needs to be "long long",
* while on IP16 and IP16L32 it is "int" (resp. "short")
* Size needs to match (or exceed) 'sizeof(void *)'.
* We can't take "long long" here as not everybody has it.
*/
typedef long intptr_t;
typedef unsigned long uintptr_t;
#endif
#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
#include <grp.h>
#define _ALL_SOURCE 1
#endif
/* used on Mac OS X */
#ifdef PRECOMPOSE_UNICODE
#include "compat/precompose_utf8.h"
#else
static inline const char *precompose_argv_prefix(int argc UNUSED,
const char **argv UNUSED,
const char *prefix)
{
return prefix;
}
static inline const char *precompose_string_if_needed(const char *in)
{
return in;
}
#define probe_utf8_pathname_composition()
#endif
#ifdef MKDIR_WO_TRAILING_SLASH
#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
int compat_mkdir_wo_trailing_slash(const char*, mode_t);
#endif
#ifdef time
#undef time
#endif
static inline time_t git_time(time_t *tloc)
{
struct timeval tv;
/*
* Avoid time(NULL), which can disagree with gettimeofday(2)
* and filesystem timestamps.
*/
gettimeofday(&tv, NULL);
if (tloc)
*tloc = tv.tv_sec;
return tv.tv_sec;
}
#define time git_time
#ifdef NO_STRUCT_ITIMERVAL
struct itimerval {
struct timeval it_interval;
struct timeval it_value;
};
#endif
#ifdef NO_SETITIMER
static inline int git_setitimer(int which UNUSED,
const struct itimerval *value UNUSED,
struct itimerval *newvalue UNUSED) {
return 0; /* pretend success */
}
#undef setitimer
#define setitimer(which,value,ovalue) git_setitimer(which,value,ovalue)
#endif
#ifndef NO_LIBGEN_H
#include <libgen.h>
#else
#define basename gitbasename
char *gitbasename(char *);
#define dirname gitdirname
char *gitdirname(char *);
#endif
#ifndef NO_ICONV
#include <iconv.h>
#endif
#ifndef NO_OPENSSL
#ifdef __APPLE__
#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
#include <AvailabilityMacros.h>
#undef DEPRECATED_ATTRIBUTE
#define DEPRECATED_ATTRIBUTE
#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
#endif
#include <openssl/ssl.h>
#include <openssl/err.h>
#endif
#ifdef HAVE_SYSINFO
# include <sys/sysinfo.h>
#endif
/* On most systems <netdb.h> would have given us this, but
* not on some systems (e.g. z/OS).
*/
#ifndef NI_MAXHOST
#define NI_MAXHOST 1025
#endif
#ifndef NI_MAXSERV
#define NI_MAXSERV 32
#endif
/* On most systems <limits.h> would have given us this, but
* not on some systems (e.g. GNU/Hurd).
*/
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
#ifndef NAME_MAX
#define NAME_MAX 255
#endif
typedef uintmax_t timestamp_t;
#define PRItime PRIuMAX
#define parse_timestamp strtoumax
#define TIME_MAX UINTMAX_MAX
#define TIME_MIN 0
#ifndef PATH_SEP
#define PATH_SEP ':'
#endif
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#ifndef _PATH_DEFPATH
#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
#endif
#ifndef platform_core_config
struct config_context;
static inline int noop_core_config(const char *var UNUSED,
const char *value UNUSED,
const struct config_context *ctx UNUSED,
void *cb UNUSED)
{
return 0;
}
#define platform_core_config noop_core_config
#endif
int lstat_cache_aware_rmdir(const char *path);
#if !defined(__MINGW32__) && !defined(_MSC_VER)
#define rmdir lstat_cache_aware_rmdir
#endif
#ifndef has_dos_drive_prefix
static inline int git_has_dos_drive_prefix(const char *path UNUSED)
{
return 0;
}
#define has_dos_drive_prefix git_has_dos_drive_prefix
#endif
#ifndef skip_dos_drive_prefix
static inline int git_skip_dos_drive_prefix(char **path UNUSED)
{
return 0;
}
#define skip_dos_drive_prefix git_skip_dos_drive_prefix
#endif
static inline int git_is_dir_sep(int c)
{
return c == '/';
}
#ifndef is_dir_sep
#define is_dir_sep git_is_dir_sep
#endif
#ifndef offset_1st_component
static inline int git_offset_1st_component(const char *path)
{
return is_dir_sep(path[0]);
}
#define offset_1st_component git_offset_1st_component
#endif
#ifndef fspathcmp
#define fspathcmp git_fspathcmp
#endif
#ifndef fspathncmp
#define fspathncmp git_fspathncmp
#endif
#ifndef is_valid_path
#define is_valid_path(path) 1
#endif
#ifndef is_path_owned_by_current_user
#ifdef __TANDEM
#define ROOT_UID 65535
#else
#define ROOT_UID 0
#endif
/*
* Do not use this function when
* (1) geteuid() did not say we are running as 'root', or
* (2) using this function will compromise the system.
*
* PORTABILITY WARNING:
* This code assumes uid_t is unsigned because that is what sudo does.
* If your uid_t type is signed and all your ids are positive then it
* should all work fine.
* If your version of sudo uses negative values for uid_t or it is
* buggy and return an overflowed value in SUDO_UID, then git might
* fail to grant access to your repository properly or even mistakenly
* grant access to someone else.
* In the unlikely scenario this happened to you, and that is how you
* got to this message, we would like to know about it; so sent us an
* email to [email protected] indicating which platform you are
* using and which version of sudo, so we can improve this logic and
* maybe provide you with a patch that would prevent this issue again
* in the future.
*/
static inline void extract_id_from_env(const char *env, uid_t *id)
{
const char *real_uid = getenv(env);
/* discard anything empty to avoid a more complex check below */
if (real_uid && *real_uid) {
char *endptr = NULL;
unsigned long env_id;
errno = 0;
/* silent overflow errors could trigger a bug here */
env_id = strtoul(real_uid, &endptr, 10);
if (!*endptr && !errno)
*id = env_id;
}
}
static inline int is_path_owned_by_current_uid(const char *path,
struct strbuf *report UNUSED)
{
struct stat st;
uid_t euid;
if (lstat(path, &st))
return 0;
euid = geteuid();
if (euid == ROOT_UID)
{
if (st.st_uid == ROOT_UID)
return 1;
else
extract_id_from_env("SUDO_UID", &euid);
}
return st.st_uid == euid;
}
#define is_path_owned_by_current_user is_path_owned_by_current_uid
#endif
#ifndef find_last_dir_sep
static inline char *git_find_last_dir_sep(const char *path)
{
return strrchr(path, '/');
}
#define find_last_dir_sep git_find_last_dir_sep
#endif
#ifndef has_dir_sep
static inline int git_has_dir_sep(const char *path)
{
return !!strchr(path, '/');
}
#define has_dir_sep(path) git_has_dir_sep(path)
#endif
#ifndef query_user_email
#define query_user_email() NULL
#endif
#ifdef __TANDEM
#include <floss.h(floss_execl,floss_execlp,floss_execv,floss_execvp)>
#include <floss.h(floss_getpwuid)>
#ifndef NSIG
/*
* NonStop NSE and NSX do not provide NSIG. SIGGUARDIAN(99) is the highest
* known, by detective work using kill -l as a list is all signals
* instead of signal.h where it should be.
*/
# define NSIG 100
#endif
#endif
#if defined(__HP_cc) && (__HP_cc >= 61000)
#define NORETURN __attribute__((noreturn))
#define NORETURN_PTR
#elif defined(__GNUC__) && !defined(NO_NORETURN)
#define NORETURN __attribute__((__noreturn__))
#define NORETURN_PTR __attribute__((__noreturn__))
#elif defined(_MSC_VER)
#define NORETURN __declspec(noreturn)
#define NORETURN_PTR
#else
#define NORETURN
#define NORETURN_PTR
#ifndef __GNUC__
#ifndef __attribute__
#define __attribute__(x)
#endif
#endif
#endif
/* The sentinel attribute is valid from gcc version 4.0 */
#if defined(__GNUC__) && (__GNUC__ >= 4)
#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
/* warn_unused_result exists as of gcc 3.4.0, but be lazy and check 4.0 */
#define RESULT_MUST_BE_USED __attribute__ ((warn_unused_result))
#else
#define LAST_ARG_MUST_BE_NULL
#define RESULT_MUST_BE_USED
#endif
/*
* MAYBE_UNUSED marks a function parameter that may be unused, but
* whose use is not an error. It also can be used to annotate a
* function, a variable, or a type that may be unused.
*
* Depending on a configuration, all uses of such a thing may become
* #ifdef'ed away. Marking it with UNUSED would give a warning in a
* compilation where it is indeed used, and not marking it at all
* would give a warning in a compilation where it is unused. In such
* a case, MAYBE_UNUSED is the appropriate annotation to use.
*/
#define MAYBE_UNUSED __attribute__((__unused__))
#include "compat/bswap.h"
#include "wrapper.h"
/* General helper functions */
NORETURN void usage(const char *err);
NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
int die_message(const char *err, ...) __attribute__((format (printf, 1, 2)));
int die_message_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
#ifndef NO_OPENSSL
#ifdef APPLE_COMMON_CRYPTO
#include "compat/apple-common-crypto.h"
#else
#include <openssl/evp.h>
#include <openssl/hmac.h>
#endif /* APPLE_COMMON_CRYPTO */
#include <openssl/x509v3.h>
#endif /* NO_OPENSSL */
#ifdef HAVE_OPENSSL_CSPRNG
#include <openssl/rand.h>
#endif
/*
* Let callers be aware of the constant return value; this can help
* gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
* because other compilers may be confused by this.
*/
#if defined(__GNUC__)
static inline int const_error(void)
{
return -1;
}
#define error(...) (error(__VA_ARGS__), const_error())
#define error_errno(...) (error_errno(__VA_ARGS__), const_error())
#endif
typedef void (*report_fn)(const char *, va_list params);
void set_die_routine(NORETURN_PTR report_fn routine);
report_fn get_die_message_routine(void);
void set_error_routine(report_fn routine);
report_fn get_error_routine(void);
void set_warn_routine(report_fn routine);
report_fn get_warn_routine(void);
void set_die_is_recursing_routine(int (*routine)(void));
/*
* If the string "str" begins with the string found in "prefix", return true.
* The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
* the string right after the prefix).
*
* Otherwise, return false and leave "out" untouched.
*
* Examples:
*
* [extract branch name, fail if not a branch]
* if (!skip_prefix(ref, "refs/heads/", &branch)
* return -1;
*
* [skip prefix if present, otherwise use whole string]
* skip_prefix(name, "refs/heads/", &name);
*/
static inline bool skip_prefix(const char *str, const char *prefix,
const char **out)
{
do {
if (!*prefix) {
*out = str;
return true;
}
} while (*str++ == *prefix++);
return false;
}
/*
* Like skip_prefix, but promises never to read past "len" bytes of the input
* buffer, and returns the remaining number of bytes in "out" via "outlen".
*/
static inline bool skip_prefix_mem(const char *buf, size_t len,
const char *prefix,
const char **out, size_t *outlen)
{
size_t prefix_len = strlen(prefix);
if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
*out = buf + prefix_len;
*outlen = len - prefix_len;
return true;
}
return false;
}
/*
* If buf ends with suffix, return true and subtract the length of the suffix
* from *len. Otherwise, return false and leave *len untouched.
*/
static inline bool strip_suffix_mem(const char *buf, size_t *len,
const char *suffix)
{
size_t suflen = strlen(suffix);
if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
return false;
*len -= suflen;
return true;
}
/*
* If str ends with suffix, return true and set *len to the size of the string
* without the suffix. Otherwise, return false and set *len to the size of the
* string.
*
* Note that we do _not_ NUL-terminate str to the new length.
*/
static inline bool strip_suffix(const char *str, const char *suffix,
size_t *len)
{
*len = strlen(str);
return strip_suffix_mem(str, len, suffix);
}
#define SWAP(a, b) do { \
void *_swap_a_ptr = &(a); \
void *_swap_b_ptr = &(b); \
unsigned char _swap_buffer[sizeof(a)]; \
memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \
memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) + \
BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b))); \
memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \
} while (0)
#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
#ifndef PROT_READ
#define PROT_READ 1
#define PROT_WRITE 2
#define MAP_PRIVATE 1
#endif
#define mmap git_mmap
#define munmap git_munmap
void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
int git_munmap(void *start, size_t length);
#else /* NO_MMAP || USE_WIN32_MMAP */
#include <sys/mman.h>
#endif /* NO_MMAP || USE_WIN32_MMAP */
#ifdef NO_MMAP
/* This value must be multiple of (pagesize * 2) */
#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
#else /* NO_MMAP */
/* This value must be multiple of (pagesize * 2) */
#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
(sizeof(void*) >= 8 \
? 1 * 1024 * 1024 * 1024 \
: 32 * 1024 * 1024)
#endif /* NO_MMAP */
#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1)
#endif
#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
#define on_disk_bytes(st) ((st).st_size)
#else
#define on_disk_bytes(st) ((st).st_blocks * 512)
#endif
#ifdef NEEDS_MODE_TRANSLATION
#undef S_IFMT
#undef S_IFREG
#undef S_IFDIR
#undef S_IFLNK
#undef S_IFBLK
#undef S_IFCHR
#undef S_IFIFO
#undef S_IFSOCK
#define S_IFMT 0170000
#define S_IFREG 0100000
#define S_IFDIR 0040000
#define S_IFLNK 0120000
#define S_IFBLK 0060000
#define S_IFCHR 0020000
#define S_IFIFO 0010000
#define S_IFSOCK 0140000
#ifdef stat
#undef stat
#endif
#define stat(path, buf) git_stat(path, buf)
int git_stat(const char *, struct stat *);
#ifdef fstat
#undef fstat
#endif
#define fstat(fd, buf) git_fstat(fd, buf)
int git_fstat(int, struct stat *);
#ifdef lstat
#undef lstat
#endif
#define lstat(path, buf) git_lstat(path, buf)
int git_lstat(const char *, struct stat *);
#endif
#define DEFAULT_PACKED_GIT_LIMIT \
((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
#ifdef NO_PREAD
#define pread git_pread
ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
#endif
#ifdef NO_SETENV
#define setenv gitsetenv
int gitsetenv(const char *, const char *, int);
#endif
#ifdef NO_MKDTEMP
#define mkdtemp gitmkdtemp
char *gitmkdtemp(char *);
#endif
#ifdef NO_UNSETENV
#define unsetenv gitunsetenv
int gitunsetenv(const char *);
#endif
#ifdef NO_STRCASESTR
#define strcasestr gitstrcasestr
char *gitstrcasestr(const char *haystack, const char *needle);
#endif
#ifdef NO_STRLCPY
#define strlcpy gitstrlcpy
size_t gitstrlcpy(char *, const char *, size_t);
#endif
#ifdef NO_STRTOUMAX
#define strtoumax gitstrtoumax
uintmax_t gitstrtoumax(const char *, char **, int);
#define strtoimax gitstrtoimax
intmax_t gitstrtoimax(const char *, char **, int);
#endif
#ifdef NO_HSTRERROR
#define hstrerror githstrerror
const char *githstrerror(int herror);
#endif
#ifdef NO_MEMMEM
#define memmem gitmemmem
void *gitmemmem(const void *haystack, size_t haystacklen,
const void *needle, size_t needlelen);
#endif
#ifdef OVERRIDE_STRDUP
#ifdef strdup
#undef strdup
#endif
#define strdup gitstrdup
char *gitstrdup(const char *s);
#endif
#ifdef NO_GETPAGESIZE
#define getpagesize() sysconf(_SC_PAGESIZE)
#endif
#ifndef O_CLOEXEC
#define O_CLOEXEC 0
#endif
#ifdef FREAD_READS_DIRECTORIES
# if !defined(SUPPRESS_FOPEN_REDEFINITION)
# ifdef fopen
# undef fopen
# endif
# define fopen(a,b) git_fopen(a,b)
# endif
FILE *git_fopen(const char*, const char*);
#endif
#ifdef SNPRINTF_RETURNS_BOGUS
#ifdef snprintf
#undef snprintf
#endif
#define snprintf git_snprintf
int git_snprintf(char *str, size_t maxsize,
const char *format, ...);
#ifdef vsnprintf
#undef vsnprintf
#endif
#define vsnprintf git_vsnprintf
int git_vsnprintf(char *str, size_t maxsize,
const char *format, va_list ap);
#endif
#ifdef OPEN_RETURNS_EINTR
#undef open
#define open git_open_with_retry
int git_open_with_retry(const char *path, int flag, ...);
#endif
#ifdef __GLIBC_PREREQ
#if __GLIBC_PREREQ(2, 1)
#define HAVE_STRCHRNUL
#endif
#endif
#ifndef HAVE_STRCHRNUL
#define strchrnul gitstrchrnul
static inline char *gitstrchrnul(const char *s, int c)
{