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Diffstat (limited to 'git-compat-util.h')
| -rw-r--r-- | git-compat-util.h | 1550 |
1 files changed, 1550 insertions, 0 deletions
diff --git a/git-compat-util.h b/git-compat-util.h new file mode 100644 index 0000000..3e7a59b --- /dev/null +++ b/git-compat-util.h @@ -0,0 +1,1550 @@ +#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 + * git@vger.kernel.org. + */ +#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 + +#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 + +#include <unistd.h> +#include <stdio.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <stddef.h> +#include <stdlib.h> +#include <stdarg.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__ +#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 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 git@vger.kernel.org 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 + +#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 1. + * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in + * the string right after the prefix). + * + * Otherwise, return 0 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 int skip_prefix(const char *str, const char *prefix, + const char **out) +{ + do { + if (!*prefix) { + *out = str; + return 1; + } + } while (*str++ == *prefix++); + return 0; +} + +/* + * 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 int 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 1; + } + return 0; +} + +/* + * If buf ends with suffix, return 1 and subtract the length of the suffix + * from *len. Otherwise, return 0 and leave *len untouched. + */ +static inline int 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 0; + *len -= suflen; + return 1; +} + +/* + * If str ends with suffix, return 1 and set *len to the size of the string + * without the suffix. Otherwise, return 0 and set *len to the size of the + * string. + * + * Note that we do _not_ NUL-terminate str to the new length. + */ +static inline int 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) +{ + while (*s && *s != c) + s++; + return (char *)s; +} +#endif + +#ifdef NO_INET_PTON +int inet_pton(int af, const char *src, void *dst); +#endif + +#ifdef NO_INET_NTOP +const char *inet_ntop(int af, const void *src, char *dst, size_t size); +#endif + +#ifdef NO_PTHREADS +#define atexit git_atexit +int git_atexit(void (*handler)(void)); +#endif + +static inline size_t st_add(size_t a, size_t b) +{ + if (unsigned_add_overflows(a, b)) + die("size_t overflow: %"PRIuMAX" + %"PRIuMAX, + (uintmax_t)a, (uintmax_t)b); + return a + b; +} +#define st_add3(a,b,c) st_add(st_add((a),(b)),(c)) +#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d)) + +static inline size_t st_mult(size_t a, size_t b) +{ + if (unsigned_mult_overflows(a, b)) + die("size_t overflow: %"PRIuMAX" * %"PRIuMAX, + (uintmax_t)a, (uintmax_t)b); + return a * b; +} + +static inline size_t st_sub(size_t a, size_t b) +{ + if (a < b) + die("size_t underflow: %"PRIuMAX" - %"PRIuMAX, + (uintmax_t)a, (uintmax_t)b); + return a - b; +} + +static inline size_t st_left_shift(size_t a, unsigned shift) +{ + if (unsigned_left_shift_overflows(a, shift)) + die("size_t overflow: %"PRIuMAX" << %u", + (uintmax_t)a, shift); + return a << shift; +} + +static inline unsigned long cast_size_t_to_ulong(size_t a) +{ + if (a != (unsigned long)a) + die("object too large to read on this platform: %" + PRIuMAX" is cut off to %lu", + (uintmax_t)a, (unsigned long)a); + return (unsigned long)a; +} + +static inline int cast_size_t_to_int(size_t a) +{ + if (a > INT_MAX) + die("number too large to represent as int on this platform: %"PRIuMAX, + (uintmax_t)a); + return (int)a; +} + +/* + * Limit size of IO chunks, because huge chunks only cause pain. OS X + * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in + * the absence of bugs, large chunks can result in bad latencies when + * you decide to kill the process. + * + * We pick 8 MiB as our default, but if the platform defines SSIZE_MAX + * that is smaller than that, clip it to SSIZE_MAX, as a call to + * read(2) or write(2) larger than that is allowed to fail. As the last + * resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value" + * to override this, if the definition of SSIZE_MAX given by the platform + * is broken. + */ +#ifndef MAX_IO_SIZE +# define MAX_IO_SIZE_DEFAULT (8*1024*1024) +# if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT) +# define MAX_IO_SIZE SSIZE_MAX +# else +# define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT +# endif +#endif + +#ifdef HAVE_ALLOCA_H +# include <alloca.h> +# define xalloca(size) (alloca(size)) +# define xalloca_free(p) do {} while (0) +#else +# define xalloca(size) (xmalloc(size)) +# define xalloca_free(p) (free(p)) +#endif + +/* + * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note + * that ptr is used twice, so don't pass e.g. ptr++. + */ +#define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0) + +#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc))) +#define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x))) +#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc))) + +#define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \ + BARF_UNLESS_COPYABLE((dst), (src))) +static inline void copy_array(void *dst, const void *src, size_t n, size_t size) +{ + if (n) + memcpy(dst, src, st_mult(size, n)); +} + +#define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \ + BARF_UNLESS_COPYABLE((dst), (src))) +static inline void move_array(void *dst, const void *src, size_t n, size_t size) +{ + if (n) + memmove(dst, src, st_mult(size, n)); +} + +#define DUP_ARRAY(dst, src, n) do { \ + size_t dup_array_n_ = (n); \ + COPY_ARRAY(ALLOC_ARRAY((dst), dup_array_n_), (src), dup_array_n_); \ +} while (0) + +/* + * These functions help you allocate structs with flex arrays, and copy + * the data directly into the array. For example, if you had: + * + * struct foo { + * int bar; + * char name[FLEX_ARRAY]; + * }; + * + * you can do: + * + * struct foo *f; + * FLEX_ALLOC_MEM(f, name, src, len); + * + * to allocate a "foo" with the contents of "src" in the "name" field. + * The resulting struct is automatically zero'd, and the flex-array field + * is NUL-terminated (whether the incoming src buffer was or not). + * + * The FLEXPTR_* variants operate on structs that don't use flex-arrays, + * but do want to store a pointer to some extra data in the same allocated + * block. For example, if you have: + * + * struct foo { + * char *name; + * int bar; + * }; + * + * you can do: + * + * struct foo *f; + * FLEXPTR_ALLOC_STR(f, name, src); + * + * and "name" will point to a block of memory after the struct, which will be + * freed along with the struct (but the pointer can be repointed anywhere). + * + * The *_STR variants accept a string parameter rather than a ptr/len + * combination. + * + * Note that these macros will evaluate the first parameter multiple + * times, and it must be assignable as an lvalue. + */ +#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \ + size_t flex_array_len_ = (len); \ + (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \ + memcpy((void *)(x)->flexname, (buf), flex_array_len_); \ +} while (0) +#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \ + size_t flex_array_len_ = (len); \ + (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \ + memcpy((x) + 1, (buf), flex_array_len_); \ + (x)->ptrname = (void *)((x)+1); \ +} while(0) +#define FLEX_ALLOC_STR(x, flexname, str) \ + FLEX_ALLOC_MEM((x), flexname, (str), strlen(str)) +#define FLEXPTR_ALLOC_STR(x, ptrname, str) \ + FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str)) + +#define alloc_nr(x) (((x)+16)*3/2) + +/** + * Dynamically growing an array using realloc() is error prone and boring. + * + * Define your array with: + * + * - a pointer (`item`) that points at the array, initialized to `NULL` + * (although please name the variable based on its contents, not on its + * type); + * + * - an integer variable (`alloc`) that keeps track of how big the current + * allocation is, initialized to `0`; + * + * - another integer variable (`nr`) to keep track of how many elements the + * array currently has, initialized to `0`. + * + * Then before adding `n`th element to the item, call `ALLOC_GROW(item, n, + * alloc)`. This ensures that the array can hold at least `n` elements by + * calling `realloc(3)` and adjusting `alloc` variable. + * + * ------------ + * sometype *item; + * size_t nr; + * size_t alloc + * + * for (i = 0; i < nr; i++) + * if (we like item[i] already) + * return; + * + * // we did not like any existing one, so add one + * ALLOC_GROW(item, nr + 1, alloc); + * item[nr++] = value you like; + * ------------ + * + * You are responsible for updating the `nr` variable. + * + * If you need to specify the number of elements to allocate explicitly + * then use the macro `REALLOC_ARRAY(item, alloc)` instead of `ALLOC_GROW`. + * + * Consider using ALLOC_GROW_BY instead of ALLOC_GROW as it has some + * added niceties. + * + * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. + */ +#define ALLOC_GROW(x, nr, alloc) \ + do { \ + if ((nr) > alloc) { \ + if (alloc_nr(alloc) < (nr)) \ + alloc = (nr); \ + else \ + alloc = alloc_nr(alloc); \ + REALLOC_ARRAY(x, alloc); \ + } \ + } while (0) + +/* + * Similar to ALLOC_GROW but handles updating of the nr value and + * zeroing the bytes of the newly-grown array elements. + * + * DO NOT USE any expression with side-effect for any of the + * arguments. + */ +#define ALLOC_GROW_BY(x, nr, increase, alloc) \ + do { \ + if (increase) { \ + size_t new_nr = nr + (increase); \ + if (new_nr < nr) \ + BUG("negative growth in ALLOC_GROW_BY"); \ + ALLOC_GROW(x, new_nr, alloc); \ + memset((x) + nr, 0, sizeof(*(x)) * (increase)); \ + nr = new_nr; \ + } \ + } while (0) + +static inline char *xstrdup_or_null(const char *str) +{ + return str ? xstrdup(str) : NULL; +} + +static inline size_t xsize_t(off_t len) +{ + if (len < 0 || (uintmax_t) len > SIZE_MAX) + die("Cannot handle files this big"); + return (size_t) len; +} + +#ifndef HOST_NAME_MAX +#define HOST_NAME_MAX 256 +#endif + +#include "sane-ctype.h" + +/* + * Like skip_prefix, but compare case-insensitively. Note that the comparison + * is done via tolower(), so it is strictly ASCII (no multi-byte characters or + * locale-specific conversions). + */ +static inline int skip_iprefix(const char *str, const char *prefix, + const char **out) +{ + do { + if (!*prefix) { + *out = str; + return 1; + } + } while (tolower(*str++) == tolower(*prefix++)); + return 0; +} + +/* + * Like skip_prefix_mem, but compare case-insensitively. Note that the + * comparison is done via tolower(), so it is strictly ASCII (no multi-byte + * characters or locale-specific conversions). + */ +static inline int skip_iprefix_mem(const char *buf, size_t len, + const char *prefix, + const char **out, size_t *outlen) +{ + do { + if (!*prefix) { + *out = buf; + *outlen = len; + return 1; + } + } while (len-- > 0 && tolower(*buf++) == tolower(*prefix++)); + return 0; +} + +static inline int strtoul_ui(char const *s, int base, unsigned int *result) +{ + unsigned long ul; + char *p; + + errno = 0; + /* negative values would be accepted by strtoul */ + if (strchr(s, '-')) + return -1; + ul = strtoul(s, &p, base); + if (errno || *p || p == s || (unsigned int) ul != ul) + return -1; + *result = ul; + return 0; +} + +static inline int strtol_i(char const *s, int base, int *result) +{ + long ul; + char *p; + + errno = 0; + ul = strtol(s, &p, base); + if (errno || *p || p == s || (int) ul != ul) + return -1; + *result = ul; + return 0; +} + +void git_stable_qsort(void *base, size_t nmemb, size_t size, + int(*compar)(const void *, const void *)); +#ifdef INTERNAL_QSORT +#define qsort git_stable_qsort +#endif + +#define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar) +static inline void sane_qsort(void *base, size_t nmemb, size_t size, + int(*compar)(const void *, const void *)) +{ + if (nmemb > 1) + qsort(base, nmemb, size, compar); +} + +#define STABLE_QSORT(base, n, compar) \ + git_stable_qsort((base), (n), sizeof(*(base)), compar) + +#ifndef HAVE_ISO_QSORT_S +int git_qsort_s(void *base, size_t nmemb, size_t size, + int (*compar)(const void *, const void *, void *), void *ctx); +#define qsort_s git_qsort_s +#endif + +#define QSORT_S(base, n, compar, ctx) do { \ + if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \ + BUG("qsort_s() failed"); \ +} while (0) + +#ifndef REG_STARTEND +#error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd" +#endif + +static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size, + size_t nmatch, regmatch_t pmatch[], int eflags) +{ + assert(nmatch > 0 && pmatch); + pmatch[0].rm_so = 0; + pmatch[0].rm_eo = size; + return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND); +} + +#ifdef USE_ENHANCED_BASIC_REGULAR_EXPRESSIONS +int git_regcomp(regex_t *preg, const char *pattern, int cflags); +#define regcomp git_regcomp +#endif + +#ifndef DIR_HAS_BSD_GROUP_SEMANTICS +# define FORCE_DIR_SET_GID S_ISGID +#else +# define FORCE_DIR_SET_GID 0 +#endif + +#ifdef NO_NSEC +#undef USE_NSEC +#define ST_CTIME_NSEC(st) 0 +#define ST_MTIME_NSEC(st) 0 +#else +#ifdef USE_ST_TIMESPEC +#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec)) +#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec)) +#else +#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec)) +#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec)) +#endif +#endif + +#ifdef UNRELIABLE_FSTAT +#define fstat_is_reliable() 0 +#else +#define fstat_is_reliable() 1 +#endif + +#ifndef va_copy +/* + * Since an obvious implementation of va_list would be to make it a + * pointer into the stack frame, a simple assignment will work on + * many systems. But let's try to be more portable. + */ +#ifdef __va_copy +#define va_copy(dst, src) __va_copy(dst, src) +#else +#define va_copy(dst, src) ((dst) = (src)) +#endif +#endif + +/* usage.c: only to be used for testing BUG() implementation (see test-tool) */ +extern int BUG_exit_code; + +/* usage.c: if bug() is called we should have a BUG_if_bug() afterwards */ +extern int bug_called_must_BUG; + +__attribute__((format (printf, 3, 4))) NORETURN +void BUG_fl(const char *file, int line, const char *fmt, ...); +#define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__) +__attribute__((format (printf, 3, 4))) +void bug_fl(const char *file, int line, const char *fmt, ...); +#define bug(...) bug_fl(__FILE__, __LINE__, __VA_ARGS__) +#define BUG_if_bug(...) do { \ + if (bug_called_must_BUG) \ + BUG_fl(__FILE__, __LINE__, __VA_ARGS__); \ +} while (0) + +#ifndef FSYNC_METHOD_DEFAULT +#ifdef __APPLE__ +#define FSYNC_METHOD_DEFAULT FSYNC_METHOD_WRITEOUT_ONLY +#else +#define FSYNC_METHOD_DEFAULT FSYNC_METHOD_FSYNC +#endif +#endif + +#ifndef SHELL_PATH +# define SHELL_PATH "/bin/sh" +#endif + +#ifndef _POSIX_THREAD_SAFE_FUNCTIONS +static inline void git_flockfile(FILE *fh UNUSED) +{ + ; /* nothing */ +} +static inline void git_funlockfile(FILE *fh UNUSED) +{ + ; /* nothing */ +} +#undef flockfile +#undef funlockfile +#undef getc_unlocked +#define flockfile(fh) git_flockfile(fh) +#define funlockfile(fh) git_funlockfile(fh) +#define getc_unlocked(fh) getc(fh) +#endif + +#ifdef FILENO_IS_A_MACRO +int git_fileno(FILE *stream); +# ifndef COMPAT_CODE_FILENO +# undef fileno +# define fileno(p) git_fileno(p) +# endif +#endif + +#ifdef NEED_ACCESS_ROOT_HANDLER +int git_access(const char *path, int mode); +# ifndef COMPAT_CODE_ACCESS +# ifdef access +# undef access +# endif +# define access(path, mode) git_access(path, mode) +# endif +#endif + +/* + * Our code often opens a path to an optional file, to work on its + * contents when we can successfully open it. We can ignore a failure + * to open if such an optional file does not exist, but we do want to + * report a failure in opening for other reasons (e.g. we got an I/O + * error, or the file is there, but we lack the permission to open). + * + * Call this function after seeing an error from open() or fopen() to + * see if the errno indicates a missing file that we can safely ignore. + */ +static inline int is_missing_file_error(int errno_) +{ + return (errno_ == ENOENT || errno_ == ENOTDIR); +} + +int cmd_main(int, const char **); + +/* + * Intercept all calls to exit() and route them to trace2 to + * optionally emit a message before calling the real exit(). + */ +int common_exit(const char *file, int line, int code); +#define exit(code) exit(common_exit(__FILE__, __LINE__, (code))) + +/* + * You can mark a stack variable with UNLEAK(var) to avoid it being + * reported as a leak by tools like LSAN or valgrind. The argument + * should generally be the variable itself (not its address and not what + * it points to). It's safe to use this on pointers which may already + * have been freed, or on pointers which may still be in use. + * + * Use this _only_ for a variable that leaks by going out of scope at + * program exit (so only from cmd_* functions or their direct helpers). + * Normal functions, especially those which may be called multiple + * times, should actually free their memory. This is only meant as + * an annotation, and does nothing in non-leak-checking builds. + */ +#ifdef SUPPRESS_ANNOTATED_LEAKS +void unleak_memory(const void *ptr, size_t len); +#define UNLEAK(var) unleak_memory(&(var), sizeof(var)) +#else +#define UNLEAK(var) do {} while (0) +#endif + +#define z_const +#include <zlib.h> + +#if ZLIB_VERNUM < 0x1290 +/* + * This is uncompress2, which is only available in zlib >= 1.2.9 + * (released as of early 2017). See compat/zlib-uncompress2.c. + */ +int uncompress2(Bytef *dest, uLongf *destLen, const Bytef *source, + uLong *sourceLen); +#endif + +/* + * This include must come after system headers, since it introduces macros that + * replace system names. + */ +#include "banned.h" + +/* + * container_of - Get the address of an object containing a field. + * + * @ptr: pointer to the field. + * @type: type of the object. + * @member: name of the field within the object. + */ +#define container_of(ptr, type, member) \ + ((type *) ((char *)(ptr) - offsetof(type, member))) + +/* + * helper function for `container_of_or_null' to avoid multiple + * evaluation of @ptr + */ +static inline void *container_of_or_null_offset(void *ptr, size_t offset) +{ + return ptr ? (char *)ptr - offset : NULL; +} + +/* + * like `container_of', but allows returned value to be NULL + */ +#define container_of_or_null(ptr, type, member) \ + (type *)container_of_or_null_offset(ptr, offsetof(type, member)) + +/* + * like offsetof(), but takes a pointer to a variable of type which + * contains @member, instead of a specified type. + * @ptr is subject to multiple evaluation since we can't rely on __typeof__ + * everywhere. + */ +#if defined(__GNUC__) /* clang sets this, too */ +#define OFFSETOF_VAR(ptr, member) offsetof(__typeof__(*ptr), member) +#else /* !__GNUC__ */ +#define OFFSETOF_VAR(ptr, member) \ + ((uintptr_t)&(ptr)->member - (uintptr_t)(ptr)) +#endif /* !__GNUC__ */ + +#endif |