1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
6 * For these to work they must appear very early in each
7 * file -- before most of the standard header files.
13 #define _FILE_OFFSET_BITS 64
16 /* Derived from Linux "Features Test Macro" header
17 * Convenience macros to test the versions of gcc (or
18 * a compatible compiler).
20 * #if GIT_GNUC_PREREQ (2,8)
21 * ... code requiring gcc 2.8 or later ...
24 #if defined(__GNUC__) && defined(__GNUC_MINOR__)
25 # define GIT_GNUC_PREREQ(maj, min) \
26 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
28 #define GIT_GNUC_PREREQ(maj, min) 0
34 * See if our compiler is known to support flexible array members.
36 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
37 # define FLEX_ARRAY /* empty */
38 #elif defined(__GNUC__)
40 # define FLEX_ARRAY /* empty */
42 # define FLEX_ARRAY 0 /* older GNU extension */
47 * Otherwise, default to safer but a bit wasteful traditional style
56 * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
57 * @cond: the compile-time condition which must be true.
59 * Your compile will fail if the condition isn't true, or can't be evaluated
60 * by the compiler. This can be used in an expression: its value is "0".
63 * #define foo_to_char(foo) \
65 * + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
67 #define BUILD_ASSERT_OR_ZERO(cond) \
68 (sizeof(char [1 - 2*!(cond)]) - 1)
70 #if GIT_GNUC_PREREQ(3, 1)
71 /* &arr[0] degrades to a pointer: a different type from an array */
72 # define BARF_UNLESS_AN_ARRAY(arr) \
73 BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
74 __typeof__(&(arr)[0])))
76 # define BARF_UNLESS_AN_ARRAY(arr) 0
79 * ARRAY_SIZE - get the number of elements in a visible array
80 * @x: the array whose size you want.
82 * This does not work on pointers, or arrays declared as [], or
83 * function parameters. With correct compiler support, such usage
84 * will cause a build error (see the build_assert_or_zero macro).
86 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
88 #define bitsizeof(x) (CHAR_BIT * sizeof(x))
90 #define maximum_signed_value_of_type(a) \
91 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
93 #define maximum_unsigned_value_of_type(a) \
94 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
97 * Signed integer overflow is undefined in C, so here's a helper macro
98 * to detect if the sum of two integers will overflow.
100 * Requires: a >= 0, typeof(a) equals typeof(b)
102 #define signed_add_overflows(a, b) \
103 ((b) > maximum_signed_value_of_type(a) - (a))
105 #define unsigned_add_overflows(a, b) \
106 ((b) > maximum_unsigned_value_of_type(a) - (a))
109 * Returns true if the multiplication of "a" and "b" will
110 * overflow. The types of "a" and "b" must match and must be unsigned.
111 * Note that this macro evaluates "a" twice!
113 #define unsigned_mult_overflows(a, b) \
114 ((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
117 #define TYPEOF(x) (__typeof__(x))
122 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
123 #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
125 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
127 /* Approximation of the length of the decimal representation of this type. */
128 #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
131 #define _POSIX_C_SOURCE 1
132 #elif defined(__sun__)
134 * On Solaris, when _XOPEN_EXTENDED is set, its header file
135 * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
136 * setting to say we are XPG5 or XPG6. Also on Solaris,
137 * XPG6 programs must be compiled with a c99 compiler, while
138 * non XPG6 programs must be compiled with a pre-c99 compiler.
140 # if __STDC_VERSION__ - 0 >= 199901L
141 # define _XOPEN_SOURCE 600
143 # define _XOPEN_SOURCE 500
145 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
146 !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
147 !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
149 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
150 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
152 #define _ALL_SOURCE 1
153 #define _GNU_SOURCE 1
154 #define _BSD_SOURCE 1
155 #define _DEFAULT_SOURCE 1
156 #define _NETBSD_SOURCE 1
157 #define _SGI_SOURCE 1
159 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
160 # if !defined(_WIN32_WINNT)
161 # define _WIN32_WINNT 0x0600
163 #define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
164 #include <winsock2.h>
166 #define GIT_WINDOWS_NATIVE
171 #include <sys/stat.h>
177 #ifdef HAVE_STRINGS_H
178 #include <strings.h> /* for strcasecmp() */
182 #ifdef NEEDS_SYS_PARAM_H
183 #include <sys/param.h>
185 #include <sys/types.h>
187 #include <sys/time.h>
194 #if !defined(NO_POLL_H)
196 #elif !defined(NO_SYS_POLL_H)
197 #include <sys/poll.h>
199 /* Pull the compat stuff */
202 #ifdef HAVE_BSD_SYSCTL
203 #include <sys/sysctl.h>
206 #if defined(__CYGWIN__)
207 #include "compat/win32/path-utils.h"
209 #if defined(__MINGW32__)
210 /* pull in Windows compatibility stuff */
211 #include "compat/win32/path-utils.h"
212 #include "compat/mingw.h"
213 #elif defined(_MSC_VER)
214 #include "compat/win32/path-utils.h"
215 #include "compat/msvc.h"
217 #include <sys/utsname.h>
218 #include <sys/wait.h>
219 #include <sys/resource.h>
220 #include <sys/socket.h>
221 #include <sys/ioctl.h>
223 #ifndef NO_SYS_SELECT_H
224 #include <sys/select.h>
226 #include <netinet/in.h>
227 #include <netinet/tcp.h>
228 #include <arpa/inet.h>
232 #ifndef NO_INTTYPES_H
233 #include <inttypes.h>
239 * On I16LP32, ILP32 and LP64 "long" is the safe bet, however
240 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
241 * while on IP16 and IP16L32 it is "int" (resp. "short")
242 * Size needs to match (or exceed) 'sizeof(void *)'.
243 * We can't take "long long" here as not everybody has it.
245 typedef long intptr_t;
246 typedef unsigned long uintptr_t;
248 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
250 #define _ALL_SOURCE 1
253 /* used on Mac OS X */
254 #ifdef PRECOMPOSE_UNICODE
255 #include "compat/precompose_utf8.h"
257 static inline const char *precompose_argv_prefix(int argc
, const char **argv
, const char *prefix
)
261 static inline const char *precompose_string_if_needed(const char *in
)
266 #define probe_utf8_pathname_composition()
269 #ifdef MKDIR_WO_TRAILING_SLASH
270 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
271 int compat_mkdir_wo_trailing_slash(const char*, mode_t
);
274 #ifdef NO_STRUCT_ITIMERVAL
276 struct timeval it_interval
;
277 struct timeval it_value
;
282 static inline int setitimer(int which
, const struct itimerval
*value
, struct itimerval
*newvalue
) {
283 return 0; /* pretend success */
290 #define basename gitbasename
291 char *gitbasename(char *);
292 #define dirname gitdirname
293 char *gitdirname(char *);
302 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
303 #include <AvailabilityMacros.h>
304 #undef DEPRECATED_ATTRIBUTE
305 #define DEPRECATED_ATTRIBUTE
306 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
308 #include <openssl/ssl.h>
309 #include <openssl/err.h>
313 # include <sys/sysinfo.h>
316 /* On most systems <netdb.h> would have given us this, but
317 * not on some systems (e.g. z/OS).
320 #define NI_MAXHOST 1025
324 #define NI_MAXSERV 32
327 /* On most systems <limits.h> would have given us this, but
328 * not on some systems (e.g. GNU/Hurd).
331 #define PATH_MAX 4096
334 typedef uintmax_t timestamp_t
;
335 #define PRItime PRIuMAX
336 #define parse_timestamp strtoumax
337 #define TIME_MAX UINTMAX_MAX
347 #ifndef _PATH_DEFPATH
348 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
351 #ifndef platform_core_config
352 static inline int noop_core_config(const char *var
, const char *value
, void *cb
)
356 #define platform_core_config noop_core_config
359 int lstat_cache_aware_rmdir(const char *path
);
360 #if !defined(__MINGW32__) && !defined(_MSC_VER)
361 #define rmdir lstat_cache_aware_rmdir
364 #ifndef has_dos_drive_prefix
365 static inline int git_has_dos_drive_prefix(const char *path
)
369 #define has_dos_drive_prefix git_has_dos_drive_prefix
372 #ifndef skip_dos_drive_prefix
373 static inline int git_skip_dos_drive_prefix(char **path
)
377 #define skip_dos_drive_prefix git_skip_dos_drive_prefix
381 static inline int git_is_dir_sep(int c
)
385 #define is_dir_sep git_is_dir_sep
388 #ifndef offset_1st_component
389 static inline int git_offset_1st_component(const char *path
)
391 return is_dir_sep(path
[0]);
393 #define offset_1st_component git_offset_1st_component
396 #ifndef is_valid_path
397 #define is_valid_path(path) 1
400 #ifndef is_path_owned_by_current_user
403 #define ROOT_UID 65535
409 * Do not use this function when
410 * (1) geteuid() did not say we are running as 'root', or
411 * (2) using this function will compromise the system.
413 * PORTABILITY WARNING:
414 * This code assumes uid_t is unsigned because that is what sudo does.
415 * If your uid_t type is signed and all your ids are positive then it
416 * should all work fine.
417 * If your version of sudo uses negative values for uid_t or it is
418 * buggy and return an overflowed value in SUDO_UID, then git might
419 * fail to grant access to your repository properly or even mistakenly
420 * grant access to someone else.
421 * In the unlikely scenario this happened to you, and that is how you
422 * got to this message, we would like to know about it; so sent us an
423 * email to git@vger.kernel.org indicating which platform you are
424 * using and which version of sudo, so we can improve this logic and
425 * maybe provide you with a patch that would prevent this issue again
428 static inline void extract_id_from_env(const char *env
, uid_t
*id
)
430 const char *real_uid
= getenv(env
);
432 /* discard anything empty to avoid a more complex check below */
433 if (real_uid
&& *real_uid
) {
435 unsigned long env_id
;
438 /* silent overflow errors could trigger a bug here */
439 env_id
= strtoul(real_uid
, &endptr
, 10);
440 if (!*endptr
&& !errno
)
445 static inline int is_path_owned_by_current_uid(const char *path
)
450 if (lstat(path
, &st
))
454 if (euid
== ROOT_UID
)
456 if (st
.st_uid
== ROOT_UID
)
459 extract_id_from_env("SUDO_UID", &euid
);
462 return st
.st_uid
== euid
;
465 #define is_path_owned_by_current_user is_path_owned_by_current_uid
468 #ifndef find_last_dir_sep
469 static inline char *git_find_last_dir_sep(const char *path
)
471 return strrchr(path
, '/');
473 #define find_last_dir_sep git_find_last_dir_sep
477 static inline int git_has_dir_sep(const char *path
)
479 return !!strchr(path
, '/');
481 #define has_dir_sep(path) git_has_dir_sep(path)
484 #ifndef query_user_email
485 #define query_user_email() NULL
489 #include <floss.h(floss_execl,floss_execlp,floss_execv,floss_execvp)>
490 #include <floss.h(floss_getpwuid)>
493 * NonStop NSE and NSX do not provide NSIG. SIGGUARDIAN(99) is the highest
494 * known, by detective work using kill -l as a list is all signals
495 * instead of signal.h where it should be.
501 #if defined(__HP_cc) && (__HP_cc >= 61000)
502 #define NORETURN __attribute__((noreturn))
504 #elif defined(__GNUC__) && !defined(NO_NORETURN)
505 #define NORETURN __attribute__((__noreturn__))
506 #define NORETURN_PTR __attribute__((__noreturn__))
507 #elif defined(_MSC_VER)
508 #define NORETURN __declspec(noreturn)
514 #ifndef __attribute__
515 #define __attribute__(x)
520 /* The sentinel attribute is valid from gcc version 4.0 */
521 #if defined(__GNUC__) && (__GNUC__ >= 4)
522 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
524 #define LAST_ARG_MUST_BE_NULL
527 #define MAYBE_UNUSED __attribute__((__unused__))
529 #include "compat/bswap.h"
531 #include "wildmatch.h"
535 /* General helper functions */
536 void vreportf(const char *prefix
, const char *err
, va_list params
);
537 NORETURN
void usage(const char *err
);
538 NORETURN
void usagef(const char *err
, ...) __attribute__((format (printf
, 1, 2)));
539 NORETURN
void die(const char *err
, ...) __attribute__((format (printf
, 1, 2)));
540 NORETURN
void die_errno(const char *err
, ...) __attribute__((format (printf
, 1, 2)));
541 int error(const char *err
, ...) __attribute__((format (printf
, 1, 2)));
542 int error_errno(const char *err
, ...) __attribute__((format (printf
, 1, 2)));
543 void warning(const char *err
, ...) __attribute__((format (printf
, 1, 2)));
544 void warning_errno(const char *err
, ...) __attribute__((format (printf
, 1, 2)));
547 #ifdef APPLE_COMMON_CRYPTO
548 #include "compat/apple-common-crypto.h"
550 #include <openssl/evp.h>
551 #include <openssl/hmac.h>
552 #endif /* APPLE_COMMON_CRYPTO */
553 #include <openssl/x509v3.h>
554 #endif /* NO_OPENSSL */
557 * Let callers be aware of the constant return value; this can help
558 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
559 * because some compilers may not support variadic macros. Since we're only
560 * trying to help gcc, anyway, it's OK; other compilers will fall back to
561 * using the function as usual.
563 #if defined(__GNUC__)
564 static inline int const_error(void)
568 #define error(...) (error(__VA_ARGS__), const_error())
569 #define error_errno(...) (error_errno(__VA_ARGS__), const_error())
572 typedef void (*report_fn
)(const char *, va_list params
);
574 void set_die_routine(NORETURN_PTR report_fn routine
);
575 void set_error_routine(report_fn routine
);
576 report_fn
get_error_routine(void);
577 void set_warn_routine(report_fn routine
);
578 report_fn
get_warn_routine(void);
579 void set_die_is_recursing_routine(int (*routine
)(void));
581 int starts_with(const char *str
, const char *prefix
);
582 int istarts_with(const char *str
, const char *prefix
);
585 * If the string "str" begins with the string found in "prefix", return 1.
586 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
587 * the string right after the prefix).
589 * Otherwise, return 0 and leave "out" untouched.
593 * [extract branch name, fail if not a branch]
594 * if (!skip_prefix(ref, "refs/heads/", &branch)
597 * [skip prefix if present, otherwise use whole string]
598 * skip_prefix(name, "refs/heads/", &name);
600 static inline int skip_prefix(const char *str
, const char *prefix
,
608 } while (*str
++ == *prefix
++);
613 * If the string "str" is the same as the string in "prefix", then the "arg"
614 * parameter is set to the "def" parameter and 1 is returned.
615 * If the string "str" begins with the string found in "prefix" and then a
616 * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
617 * (i.e., to the point in the string right after the prefix and the "=" sign),
620 * Otherwise, return 0 and leave "arg" untouched.
622 * When we accept both a "--key" and a "--key=<val>" option, this function
623 * can be used instead of !strcmp(arg, "--key") and then
624 * skip_prefix(arg, "--key=", &arg) to parse such an option.
626 int skip_to_optional_arg_default(const char *str
, const char *prefix
,
627 const char **arg
, const char *def
);
629 static inline int skip_to_optional_arg(const char *str
, const char *prefix
,
632 return skip_to_optional_arg_default(str
, prefix
, arg
, "");
636 * Like skip_prefix, but promises never to read past "len" bytes of the input
637 * buffer, and returns the remaining number of bytes in "out" via "outlen".
639 static inline int skip_prefix_mem(const char *buf
, size_t len
,
641 const char **out
, size_t *outlen
)
643 size_t prefix_len
= strlen(prefix
);
644 if (prefix_len
<= len
&& !memcmp(buf
, prefix
, prefix_len
)) {
645 *out
= buf
+ prefix_len
;
646 *outlen
= len
- prefix_len
;
653 * If buf ends with suffix, return 1 and subtract the length of the suffix
654 * from *len. Otherwise, return 0 and leave *len untouched.
656 static inline int strip_suffix_mem(const char *buf
, size_t *len
,
659 size_t suflen
= strlen(suffix
);
660 if (*len
< suflen
|| memcmp(buf
+ (*len
- suflen
), suffix
, suflen
))
667 * If str ends with suffix, return 1 and set *len to the size of the string
668 * without the suffix. Otherwise, return 0 and set *len to the size of the
671 * Note that we do _not_ NUL-terminate str to the new length.
673 static inline int strip_suffix(const char *str
, const char *suffix
, size_t *len
)
676 return strip_suffix_mem(str
, len
, suffix
);
679 static inline int ends_with(const char *str
, const char *suffix
)
682 return strip_suffix(str
, suffix
, &len
);
685 #define SWAP(a, b) do { \
686 void *_swap_a_ptr = &(a); \
687 void *_swap_b_ptr = &(b); \
688 unsigned char _swap_buffer[sizeof(a)]; \
689 memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \
690 memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) + \
691 BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b))); \
692 memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \
695 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
700 #define MAP_PRIVATE 1
703 #define mmap git_mmap
704 #define munmap git_munmap
705 void *git_mmap(void *start
, size_t length
, int prot
, int flags
, int fd
, off_t offset
);
706 int git_munmap(void *start
, size_t length
);
708 #else /* NO_MMAP || USE_WIN32_MMAP */
710 #include <sys/mman.h>
712 #endif /* NO_MMAP || USE_WIN32_MMAP */
716 /* This value must be multiple of (pagesize * 2) */
717 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
721 /* This value must be multiple of (pagesize * 2) */
722 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
723 (sizeof(void*) >= 8 \
724 ? 1 * 1024 * 1024 * 1024 \
730 #define MAP_FAILED ((void *)-1)
733 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
734 #define on_disk_bytes(st) ((st).st_size)
736 #define on_disk_bytes(st) ((st).st_blocks * 512)
739 #ifdef NEEDS_MODE_TRANSLATION
748 #define S_IFMT 0170000
749 #define S_IFREG 0100000
750 #define S_IFDIR 0040000
751 #define S_IFLNK 0120000
752 #define S_IFBLK 0060000
753 #define S_IFCHR 0020000
754 #define S_IFIFO 0010000
755 #define S_IFSOCK 0140000
759 #define stat(path, buf) git_stat(path, buf)
760 int git_stat(const char *, struct stat
*);
764 #define fstat(fd, buf) git_fstat(fd, buf)
765 int git_fstat(int, struct stat
*);
769 #define lstat(path, buf) git_lstat(path, buf)
770 int git_lstat(const char *, struct stat
*);
773 #define DEFAULT_PACKED_GIT_LIMIT \
774 ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
777 #define pread git_pread
778 ssize_t
git_pread(int fd
, void *buf
, size_t count
, off_t offset
);
781 * Forward decl that will remind us if its twin in cache.h changes.
782 * This function is used in compat/pread.c. But we can't include
785 ssize_t
read_in_full(int fd
, void *buf
, size_t count
);
788 #define setenv gitsetenv
789 int gitsetenv(const char *, const char *, int);
793 #define mkdtemp gitmkdtemp
794 char *gitmkdtemp(char *);
798 #define unsetenv gitunsetenv
799 void gitunsetenv(const char *);
803 #define strcasestr gitstrcasestr
804 char *gitstrcasestr(const char *haystack
, const char *needle
);
808 #define strlcpy gitstrlcpy
809 size_t gitstrlcpy(char *, const char *, size_t);
813 #define strtoumax gitstrtoumax
814 uintmax_t gitstrtoumax(const char *, char **, int);
815 #define strtoimax gitstrtoimax
816 intmax_t gitstrtoimax(const char *, char **, int);
820 #define hstrerror githstrerror
821 const char *githstrerror(int herror
);
825 #define memmem gitmemmem
826 void *gitmemmem(const void *haystack
, size_t haystacklen
,
827 const void *needle
, size_t needlelen
);
830 #ifdef OVERRIDE_STRDUP
834 #define strdup gitstrdup
835 char *gitstrdup(const char *s
);
838 #ifdef NO_GETPAGESIZE
839 #define getpagesize() sysconf(_SC_PAGESIZE)
846 #ifdef FREAD_READS_DIRECTORIES
847 # if !defined(SUPPRESS_FOPEN_REDEFINITION)
851 # define fopen(a,b) git_fopen(a,b)
853 FILE *git_fopen(const char*, const char*);
856 #ifdef SNPRINTF_RETURNS_BOGUS
860 #define snprintf git_snprintf
861 int git_snprintf(char *str
, size_t maxsize
,
862 const char *format
, ...);
866 #define vsnprintf git_vsnprintf
867 int git_vsnprintf(char *str
, size_t maxsize
,
868 const char *format
, va_list ap
);
871 #ifdef OPEN_RETURNS_EINTR
873 #define open git_open_with_retry
874 int git_open_with_retry(const char *path
, int flag
, ...);
877 #ifdef __GLIBC_PREREQ
878 #if __GLIBC_PREREQ(2, 1)
879 #define HAVE_STRCHRNUL
883 #ifndef HAVE_STRCHRNUL
884 #define strchrnul gitstrchrnul
885 static inline char *gitstrchrnul(const char *s
, int c
)
887 while (*s
&& *s
!= c
)
894 int inet_pton(int af
, const char *src
, void *dst
);
898 const char *inet_ntop(int af
, const void *src
, char *dst
, size_t size
);
902 #define atexit git_atexit
903 int git_atexit(void (*handler
)(void));
906 static inline size_t st_add(size_t a
, size_t b
)
908 if (unsigned_add_overflows(a
, b
))
909 die("size_t overflow: %"PRIuMAX
" + %"PRIuMAX
,
910 (uintmax_t)a
, (uintmax_t)b
);
913 #define st_add3(a,b,c) st_add(st_add((a),(b)),(c))
914 #define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
916 static inline size_t st_mult(size_t a
, size_t b
)
918 if (unsigned_mult_overflows(a
, b
))
919 die("size_t overflow: %"PRIuMAX
" * %"PRIuMAX
,
920 (uintmax_t)a
, (uintmax_t)b
);
924 static inline size_t st_sub(size_t a
, size_t b
)
927 die("size_t underflow: %"PRIuMAX
" - %"PRIuMAX
,
928 (uintmax_t)a
, (uintmax_t)b
);
934 # define xalloca(size) (alloca(size))
935 # define xalloca_free(p) do {} while (0)
937 # define xalloca(size) (xmalloc(size))
938 # define xalloca_free(p) (free(p))
940 char *xstrdup(const char *str
);
941 void *xmalloc(size_t size
);
942 void *xmallocz(size_t size
);
943 void *xmallocz_gently(size_t size
);
944 void *xmemdupz(const void *data
, size_t len
);
945 char *xstrndup(const char *str
, size_t len
);
946 void *xrealloc(void *ptr
, size_t size
);
947 void *xcalloc(size_t nmemb
, size_t size
);
948 void *xmmap(void *start
, size_t length
, int prot
, int flags
, int fd
, off_t offset
);
949 void *xmmap_gently(void *start
, size_t length
, int prot
, int flags
, int fd
, off_t offset
);
950 int xopen(const char *path
, int flags
, ...);
951 ssize_t
xread(int fd
, void *buf
, size_t len
);
952 ssize_t
xwrite(int fd
, const void *buf
, size_t len
);
953 ssize_t
xpread(int fd
, void *buf
, size_t len
, off_t offset
);
955 FILE *xfopen(const char *path
, const char *mode
);
956 FILE *xfdopen(int fd
, const char *mode
);
957 int xmkstemp(char *temp_filename
);
958 int xmkstemp_mode(char *temp_filename
, int mode
);
960 FILE *fopen_for_writing(const char *path
);
961 FILE *fopen_or_warn(const char *path
, const char *mode
);
964 * Like strncmp, but only return zero if s is NUL-terminated and exactly len
965 * characters long. If it is not, consider it greater than t.
967 int xstrncmpz(const char *s
, const char *t
, size_t len
);
970 * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
971 * that ptr is used twice, so don't pass e.g. ptr++.
973 #define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
975 #define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
976 #define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x)))
977 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
979 #define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
980 BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
981 static inline void copy_array(void *dst
, const void *src
, size_t n
, size_t size
)
984 memcpy(dst
, src
, st_mult(size
, n
));
987 #define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
988 BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
989 static inline void move_array(void *dst
, const void *src
, size_t n
, size_t size
)
992 memmove(dst
, src
, st_mult(size
, n
));
996 * These functions help you allocate structs with flex arrays, and copy
997 * the data directly into the array. For example, if you had:
1001 * char name[FLEX_ARRAY];
1007 * FLEX_ALLOC_MEM(f, name, src, len);
1009 * to allocate a "foo" with the contents of "src" in the "name" field.
1010 * The resulting struct is automatically zero'd, and the flex-array field
1011 * is NUL-terminated (whether the incoming src buffer was or not).
1013 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
1014 * but do want to store a pointer to some extra data in the same allocated
1015 * block. For example, if you have:
1025 * FLEXPTR_ALLOC_STR(f, name, src);
1027 * and "name" will point to a block of memory after the struct, which will be
1028 * freed along with the struct (but the pointer can be repointed anywhere).
1030 * The *_STR variants accept a string parameter rather than a ptr/len
1033 * Note that these macros will evaluate the first parameter multiple
1034 * times, and it must be assignable as an lvalue.
1036 #define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
1037 size_t flex_array_len_ = (len); \
1038 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
1039 memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
1041 #define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
1042 size_t flex_array_len_ = (len); \
1043 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
1044 memcpy((x) + 1, (buf), flex_array_len_); \
1045 (x)->ptrname = (void *)((x)+1); \
1047 #define FLEX_ALLOC_STR(x, flexname, str) \
1048 FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
1049 #define FLEXPTR_ALLOC_STR(x, ptrname, str) \
1050 FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
1052 static inline char *xstrdup_or_null(const char *str
)
1054 return str
? xstrdup(str
) : NULL
;
1057 static inline size_t xsize_t(off_t len
)
1059 size_t size
= (size_t) len
;
1061 if (len
!= (off_t
) size
)
1062 die("Cannot handle files this big");
1066 __attribute__((format (printf
, 3, 4)))
1067 int xsnprintf(char *dst
, size_t max
, const char *fmt
, ...);
1069 #ifndef HOST_NAME_MAX
1070 #define HOST_NAME_MAX 256
1073 int xgethostname(char *buf
, size_t len
);
1075 /* in ctype.c, for kwset users */
1076 extern const unsigned char tolower_trans_tbl
[256];
1078 /* Sane ctype - no locale, and works with signed chars */
1093 extern const unsigned char sane_ctype
[256];
1094 #define GIT_SPACE 0x01
1095 #define GIT_DIGIT 0x02
1096 #define GIT_ALPHA 0x04
1097 #define GIT_GLOB_SPECIAL 0x08
1098 #define GIT_REGEX_SPECIAL 0x10
1099 #define GIT_PATHSPEC_MAGIC 0x20
1100 #define GIT_CNTRL 0x40
1101 #define GIT_PUNCT 0x80
1102 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
1103 #define isascii(x) (((x) & ~0x7f) == 0)
1104 #define isspace(x) sane_istest(x,GIT_SPACE)
1105 #define isdigit(x) sane_istest(x,GIT_DIGIT)
1106 #define isalpha(x) sane_istest(x,GIT_ALPHA)
1107 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
1108 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
1109 #define islower(x) sane_iscase(x, 1)
1110 #define isupper(x) sane_iscase(x, 0)
1111 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
1112 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
1113 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
1114 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
1115 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
1116 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
1117 #define tolower(x) sane_case((unsigned char)(x), 0x20)
1118 #define toupper(x) sane_case((unsigned char)(x), 0)
1119 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
1121 static inline int sane_case(int x
, int high
)
1123 if (sane_istest(x
, GIT_ALPHA
))
1124 x
= (x
& ~0x20) | high
;
1128 static inline int sane_iscase(int x
, int is_lower
)
1130 if (!sane_istest(x
, GIT_ALPHA
))
1134 return (x
& 0x20) != 0;
1136 return (x
& 0x20) == 0;
1140 * Like skip_prefix, but compare case-insensitively. Note that the comparison
1141 * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1142 * locale-specific conversions).
1144 static inline int skip_iprefix(const char *str
, const char *prefix
,
1152 } while (tolower(*str
++) == tolower(*prefix
++));
1156 static inline int strtoul_ui(char const *s
, int base
, unsigned int *result
)
1162 /* negative values would be accepted by strtoul */
1165 ul
= strtoul(s
, &p
, base
);
1166 if (errno
|| *p
|| p
== s
|| (unsigned int) ul
!= ul
)
1172 static inline int strtol_i(char const *s
, int base
, int *result
)
1178 ul
= strtol(s
, &p
, base
);
1179 if (errno
|| *p
|| p
== s
|| (int) ul
!= ul
)
1185 void git_stable_qsort(void *base
, size_t nmemb
, size_t size
,
1186 int(*compar
)(const void *, const void *));
1187 #ifdef INTERNAL_QSORT
1188 #define qsort git_stable_qsort
1191 #define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1192 static inline void sane_qsort(void *base
, size_t nmemb
, size_t size
,
1193 int(*compar
)(const void *, const void *))
1196 qsort(base
, nmemb
, size
, compar
);
1199 #define STABLE_QSORT(base, n, compar) \
1200 git_stable_qsort((base), (n), sizeof(*(base)), compar)
1202 #ifndef HAVE_ISO_QSORT_S
1203 int git_qsort_s(void *base
, size_t nmemb
, size_t size
,
1204 int (*compar
)(const void *, const void *, void *), void *ctx
);
1205 #define qsort_s git_qsort_s
1208 #define QSORT_S(base, n, compar, ctx) do { \
1209 if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1210 BUG("qsort_s() failed"); \
1213 #ifndef REG_STARTEND
1214 #error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1217 static inline int regexec_buf(const regex_t
*preg
, const char *buf
, size_t size
,
1218 size_t nmatch
, regmatch_t pmatch
[], int eflags
)
1220 assert(nmatch
> 0 && pmatch
);
1221 pmatch
[0].rm_so
= 0;
1222 pmatch
[0].rm_eo
= size
;
1223 return regexec(preg
, buf
, nmatch
, pmatch
, eflags
| REG_STARTEND
);
1226 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1227 # define FORCE_DIR_SET_GID S_ISGID
1229 # define FORCE_DIR_SET_GID 0
1234 #define ST_CTIME_NSEC(st) 0
1235 #define ST_MTIME_NSEC(st) 0
1237 #ifdef USE_ST_TIMESPEC
1238 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1239 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1241 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1242 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1246 #ifdef UNRELIABLE_FSTAT
1247 #define fstat_is_reliable() 0
1249 #define fstat_is_reliable() 1
1254 * Since an obvious implementation of va_list would be to make it a
1255 * pointer into the stack frame, a simple assignment will work on
1256 * many systems. But let's try to be more portable.
1259 #define va_copy(dst, src) __va_copy(dst, src)
1261 #define va_copy(dst, src) ((dst) = (src))
1266 * This is always defined as a first step towards making the use of variadic
1267 * macros unconditional. If it causes compilation problems on your platform,
1268 * please report it to the Git mailing list at git@vger.kernel.org.
1270 #define HAVE_VARIADIC_MACROS 1
1272 /* usage.c: only to be used for testing BUG() implementation (see test-tool) */
1273 extern int BUG_exit_code
;
1275 #ifdef HAVE_VARIADIC_MACROS
1276 __attribute__((format (printf
, 3, 4))) NORETURN
1277 void BUG_fl(const char *file
, int line
, const char *fmt
, ...);
1278 #define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1280 __attribute__((format (printf
, 1, 2))) NORETURN
1281 void BUG(const char *fmt
, ...);
1285 * Preserves errno, prints a message, but gives no warning for ENOENT.
1286 * Returns 0 on success, which includes trying to unlink an object that does
1289 int unlink_or_warn(const char *path
);
1291 * Tries to unlink file. Returns 0 if unlink succeeded
1292 * or the file already didn't exist. Returns -1 and
1293 * appends a message to err suitable for
1294 * 'error("%s", err->buf)' on error.
1296 int unlink_or_msg(const char *file
, struct strbuf
*err
);
1298 * Preserves errno, prints a message, but gives no warning for ENOENT.
1299 * Returns 0 on success, which includes trying to remove a directory that does
1302 int rmdir_or_warn(const char *path
);
1304 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1305 * the supplied file mode.
1307 int remove_or_warn(unsigned int mode
, const char *path
);
1310 * Call access(2), but warn for any error except "missing file"
1311 * (ENOENT or ENOTDIR).
1313 #define ACCESS_EACCES_OK (1U << 0)
1314 int access_or_warn(const char *path
, int mode
, unsigned flag
);
1315 int access_or_die(const char *path
, int mode
, unsigned flag
);
1317 /* Warn on an inaccessible file if errno indicates this is an error */
1318 int warn_on_fopen_errors(const char *path
);
1321 * Open with O_NOFOLLOW, or equivalent. Note that the fallback equivalent
1322 * may be racy. Do not use this as protection against an attacker who can
1323 * simultaneously create paths.
1325 int open_nofollow(const char *path
, int flags
);
1327 #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1328 #define USE_PARENS_AROUND_GETTEXT_N 1
1332 # define SHELL_PATH "/bin/sh"
1335 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1336 static inline void flockfile(FILE *fh
)
1340 static inline void funlockfile(FILE *fh
)
1344 #define getc_unlocked(fh) getc(fh)
1347 #ifdef FILENO_IS_A_MACRO
1348 int git_fileno(FILE *stream
);
1349 # ifndef COMPAT_CODE_FILENO
1351 # define fileno(p) git_fileno(p)
1355 #ifdef NEED_ACCESS_ROOT_HANDLER
1356 int git_access(const char *path
, int mode
);
1357 # ifndef COMPAT_CODE_ACCESS
1361 # define access(path, mode) git_access(path, mode)
1366 * Our code often opens a path to an optional file, to work on its
1367 * contents when we can successfully open it. We can ignore a failure
1368 * to open if such an optional file does not exist, but we do want to
1369 * report a failure in opening for other reasons (e.g. we got an I/O
1370 * error, or the file is there, but we lack the permission to open).
1372 * Call this function after seeing an error from open() or fopen() to
1373 * see if the errno indicates a missing file that we can safely ignore.
1375 static inline int is_missing_file_error(int errno_
)
1377 return (errno_
== ENOENT
|| errno_
== ENOTDIR
);
1380 int cmd_main(int, const char **);
1383 * Intercept all calls to exit() and route them to trace2 to
1384 * optionally emit a message before calling the real exit().
1386 int trace2_cmd_exit_fl(const char *file
, int line
, int code
);
1387 #define exit(code) exit(trace2_cmd_exit_fl(__FILE__, __LINE__, (code)))
1390 * You can mark a stack variable with UNLEAK(var) to avoid it being
1391 * reported as a leak by tools like LSAN or valgrind. The argument
1392 * should generally be the variable itself (not its address and not what
1393 * it points to). It's safe to use this on pointers which may already
1394 * have been freed, or on pointers which may still be in use.
1396 * Use this _only_ for a variable that leaks by going out of scope at
1397 * program exit (so only from cmd_* functions or their direct helpers).
1398 * Normal functions, especially those which may be called multiple
1399 * times, should actually free their memory. This is only meant as
1400 * an annotation, and does nothing in non-leak-checking builds.
1402 #ifdef SUPPRESS_ANNOTATED_LEAKS
1403 void unleak_memory(const void *ptr
, size_t len
);
1404 #define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1406 #define UNLEAK(var) do {} while (0)
1410 * This include must come after system headers, since it introduces macros that
1411 * replace system names.
1416 * container_of - Get the address of an object containing a field.
1418 * @ptr: pointer to the field.
1419 * @type: type of the object.
1420 * @member: name of the field within the object.
1422 #define container_of(ptr, type, member) \
1423 ((type *) ((char *)(ptr) - offsetof(type, member)))
1426 * helper function for `container_of_or_null' to avoid multiple
1427 * evaluation of @ptr
1429 static inline void *container_of_or_null_offset(void *ptr
, size_t offset
)
1431 return ptr
? (char *)ptr
- offset
: NULL
;
1435 * like `container_of', but allows returned value to be NULL
1437 #define container_of_or_null(ptr, type, member) \
1438 (type *)container_of_or_null_offset(ptr, offsetof(type, member))
1441 * like offsetof(), but takes a pointer to a a variable of type which
1442 * contains @member, instead of a specified type.
1443 * @ptr is subject to multiple evaluation since we can't rely on __typeof__
1446 #if defined(__GNUC__) /* clang sets this, too */
1447 #define OFFSETOF_VAR(ptr, member) offsetof(__typeof__(*ptr), member)
1448 #else /* !__GNUC__ */
1449 #define OFFSETOF_VAR(ptr, member) \
1450 ((uintptr_t)&(ptr)->member - (uintptr_t)(ptr))
1451 #endif /* !__GNUC__ */
1453 void sleep_millisec(int millisec
);