09b0102cae8c8c0e39dc239003ca599a896730cf
1#ifndef GIT_COMPAT_UTIL_H
2#define GIT_COMPAT_UTIL_H
3#define _FILE_OFFSET_BITS 64
5/* Derived from Linux "Features Test Macro" header
8 * Convenience macros to test the versions of gcc (or
9 * a compatible compiler).
10 * Use them like this:
11 * #if GIT_GNUC_PREREQ (2,8)
12 * ... code requiring gcc 2.8 or later ...
13 * #endif
14*/
15#if defined(__GNUC__) && defined(__GNUC_MINOR__)
16# define GIT_GNUC_PREREQ(maj, min) \
17 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
18#else
19 #define GIT_GNUC_PREREQ(maj, min) 0
20#endif
21#ifndef FLEX_ARRAY
24/*
25 * See if our compiler is known to support flexible array members.
26 */
27#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
28# define FLEX_ARRAY /* empty */
29#elif defined(__GNUC__)
30# if (__GNUC__ >= 3)
31# define FLEX_ARRAY /* empty */
32# else
33# define FLEX_ARRAY 0 /* older GNU extension */
34# endif
35#endif
36/*
38 * Otherwise, default to safer but a bit wasteful traditional style
39 */
40#ifndef FLEX_ARRAY
41# define FLEX_ARRAY 1
42#endif
43#endif
44/*
47 * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
48 * @cond: the compile-time condition which must be true.
49 *
50 * Your compile will fail if the condition isn't true, or can't be evaluated
51 * by the compiler. This can be used in an expression: its value is "0".
52 *
53 * Example:
54 * #define foo_to_char(foo) \
55 * ((char *)(foo) \
56 * + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
57 */
58#define BUILD_ASSERT_OR_ZERO(cond) \
59 (sizeof(char [1 - 2*!(cond)]) - 1)
60#if GIT_GNUC_PREREQ(3, 1)
62 /* &arr[0] degrades to a pointer: a different type from an array */
63# define BARF_UNLESS_AN_ARRAY(arr) \
64 BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
65 __typeof__(&(arr)[0])))
66#else
67# define BARF_UNLESS_AN_ARRAY(arr) 0
68#endif
69/*
70 * ARRAY_SIZE - get the number of elements in a visible array
71 * <at> x: the array whose size you want.
72 *
73 * This does not work on pointers, or arrays declared as [], or
74 * function parameters. With correct compiler support, such usage
75 * will cause a build error (see the build_assert_or_zero macro).
76 */
77#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
78#define bitsizeof(x) (CHAR_BIT * sizeof(x))
80#define maximum_signed_value_of_type(a) \
82 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
83#define maximum_unsigned_value_of_type(a) \
85 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
86/*
88 * Signed integer overflow is undefined in C, so here's a helper macro
89 * to detect if the sum of two integers will overflow.
90 *
91 * Requires: a >= 0, typeof(a) equals typeof(b)
92 */
93#define signed_add_overflows(a, b) \
94 ((b) > maximum_signed_value_of_type(a) - (a))
95#define unsigned_add_overflows(a, b) \
97 ((b) > maximum_unsigned_value_of_type(a) - (a))
98/*
100 * Returns true if the multiplication of "a" and "b" will
101 * overflow. The types of "a" and "b" must match and must be unsigned.
102 * Note that this macro evaluates "a" twice!
103 */
104#define unsigned_mult_overflows(a, b) \
105 ((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
106#ifdef __GNUC__
108#define TYPEOF(x) (__typeof__(x))
109#else
110#define TYPEOF(x)
111#endif
112#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
114#define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
115#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
117/* Approximation of the length of the decimal representation of this type. */
119#define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
120#if defined(__sun__)
122 /*
123 * On Solaris, when _XOPEN_EXTENDED is set, its header file
124 * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
125 * setting to say we are XPG5 or XPG6. Also on Solaris,
126 * XPG6 programs must be compiled with a c99 compiler, while
127 * non XPG6 programs must be compiled with a pre-c99 compiler.
128 */
129# if __STDC_VERSION__ - 0 >= 199901L
130# define _XOPEN_SOURCE 600
131# else
132# define _XOPEN_SOURCE 500
133# endif
134#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
135 !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
136 !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
137 !defined(__CYGWIN__)
138#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
139#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
140#endif
141#define _ALL_SOURCE 1
142#define _GNU_SOURCE 1
143#define _BSD_SOURCE 1
144#define _DEFAULT_SOURCE 1
145#define _NETBSD_SOURCE 1
146#define _SGI_SOURCE 1
147#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
149# if !defined(_WIN32_WINNT)
150# define _WIN32_WINNT 0x0600
151# endif
152#define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
153#include <winsock2.h>
154#include <windows.h>
155#define GIT_WINDOWS_NATIVE
156#endif
157#include <unistd.h>
159#include <stdio.h>
160#include <sys/stat.h>
161#include <fcntl.h>
162#include <stddef.h>
163#include <stdlib.h>
164#include <stdarg.h>
165#include <string.h>
166#ifdef HAVE_STRINGS_H
167#include <strings.h> /* for strcasecmp() */
168#endif
169#include <errno.h>
170#include <limits.h>
171#ifdef NEEDS_SYS_PARAM_H
172#include <sys/param.h>
173#endif
174#include <sys/types.h>
175#include <dirent.h>
176#include <sys/time.h>
177#include <time.h>
178#include <signal.h>
179#include <assert.h>
180#include <regex.h>
181#include <utime.h>
182#include <syslog.h>
183#if !defined(NO_POLL_H)
184#include <poll.h>
185#elif !defined(NO_SYS_POLL_H)
186#include <sys/poll.h>
187#else
188/* Pull the compat stuff */
189#include <poll.h>
190#endif
191#ifdef HAVE_BSD_SYSCTL
192#include <sys/sysctl.h>
193#endif
194#if defined(__CYGWIN__)
196#include "compat/cygwin.h"
197#endif
198#if defined(__MINGW32__)
199/* pull in Windows compatibility stuff */
200#include "compat/mingw.h"
201#elif defined(_MSC_VER)
202#include "compat/msvc.h"
203#else
204#include <sys/utsname.h>
205#include <sys/wait.h>
206#include <sys/resource.h>
207#include <sys/socket.h>
208#include <sys/ioctl.h>
209#include <termios.h>
210#ifndef NO_SYS_SELECT_H
211#include <sys/select.h>
212#endif
213#include <netinet/in.h>
214#include <netinet/tcp.h>
215#include <arpa/inet.h>
216#include <netdb.h>
217#include <pwd.h>
218#include <sys/un.h>
219#ifndef NO_INTTYPES_H
220#include <inttypes.h>
221#else
222#include <stdint.h>
223#endif
224#ifdef NO_INTPTR_T
225/*
226 * On I16LP32, ILP32 and LP64 "long" is the safe bet, however
227 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
228 * while on IP16 and IP16L32 it is "int" (resp. "short")
229 * Size needs to match (or exceed) 'sizeof(void *)'.
230 * We can't take "long long" here as not everybody has it.
231 */
232typedef long intptr_t;
233typedef unsigned long uintptr_t;
234#endif
235#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
236#include <grp.h>
237#define _ALL_SOURCE 1
238#endif
239/* used on Mac OS X */
241#ifdef PRECOMPOSE_UNICODE
242#include "compat/precompose_utf8.h"
243#else
244#define precompose_str(in,i_nfd2nfc)
245#define precompose_argv(c,v)
246#define probe_utf8_pathname_composition()
247#endif
248#ifdef MKDIR_WO_TRAILING_SLASH
250#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
251extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
252#endif
253#ifdef NO_STRUCT_ITIMERVAL
255struct itimerval {
256 struct timeval it_interval;
257 struct timeval it_value;
258};
259#endif
260#ifdef NO_SETITIMER
262#define setitimer(which,value,ovalue)
263#endif
264#ifndef NO_LIBGEN_H
266#include <libgen.h>
267#else
268#define basename gitbasename
269extern char *gitbasename(char *);
270#define dirname gitdirname
271extern char *gitdirname(char *);
272#endif
273#ifndef NO_ICONV
275#include <iconv.h>
276#endif
277#ifndef NO_OPENSSL
279#ifdef __APPLE__
280#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
281#include <AvailabilityMacros.h>
282#undef DEPRECATED_ATTRIBUTE
283#define DEPRECATED_ATTRIBUTE
284#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
285#endif
286#include <openssl/ssl.h>
287#include <openssl/err.h>
288#endif
289#ifdef HAVE_SYSINFO
291# include <sys/sysinfo.h>
292#endif
293/* On most systems <netdb.h> would have given us this, but
295 * not on some systems (e.g. z/OS).
296 */
297#ifndef NI_MAXHOST
298#define NI_MAXHOST 1025
299#endif
300#ifndef NI_MAXSERV
302#define NI_MAXSERV 32
303#endif
304/* On most systems <limits.h> would have given us this, but
306 * not on some systems (e.g. GNU/Hurd).
307 */
308#ifndef PATH_MAX
309#define PATH_MAX 4096
310#endif
311#ifndef PRIuMAX
313#define PRIuMAX "llu"
314#endif
315#ifndef SCNuMAX
317#define SCNuMAX PRIuMAX
318#endif
319#ifndef PRIu32
321#define PRIu32 "u"
322#endif
323#ifndef PRIx32
325#define PRIx32 "x"
326#endif
327#ifndef PRIo32
329#define PRIo32 "o"
330#endif
331typedef uintmax_t timestamp_t;
333#define PRItime PRIuMAX
334#define parse_timestamp strtoumax
335#define TIME_MAX UINTMAX_MAX
336#ifndef PATH_SEP
338#define PATH_SEP ':'
339#endif
340#ifdef HAVE_PATHS_H
342#include <paths.h>
343#endif
344#ifndef _PATH_DEFPATH
345#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
346#endif
347#ifndef platform_core_config
349static inline int noop_core_config(const char *var, const char *value, void *cb)
350{
351 return 0;
352}
353#define platform_core_config noop_core_config
354#endif
355#ifndef has_dos_drive_prefix
357static inline int git_has_dos_drive_prefix(const char *path)
358{
359 return 0;
360}
361#define has_dos_drive_prefix git_has_dos_drive_prefix
362#endif
363#ifndef skip_dos_drive_prefix
365static inline int git_skip_dos_drive_prefix(char **path)
366{
367 return 0;
368}
369#define skip_dos_drive_prefix git_skip_dos_drive_prefix
370#endif
371#ifndef is_dir_sep
373static inline int git_is_dir_sep(int c)
374{
375 return c == '/';
376}
377#define is_dir_sep git_is_dir_sep
378#endif
379#ifndef offset_1st_component
381static inline int git_offset_1st_component(const char *path)
382{
383 return is_dir_sep(path[0]);
384}
385#define offset_1st_component git_offset_1st_component
386#endif
387#ifndef find_last_dir_sep
389static inline char *git_find_last_dir_sep(const char *path)
390{
391 return strrchr(path, '/');
392}
393#define find_last_dir_sep git_find_last_dir_sep
394#endif
395#ifndef query_user_email
397#define query_user_email() NULL
398#endif
399#if defined(__HP_cc) && (__HP_cc >= 61000)
401#define NORETURN __attribute__((noreturn))
402#define NORETURN_PTR
403#elif defined(__GNUC__) && !defined(NO_NORETURN)
404#define NORETURN __attribute__((__noreturn__))
405#define NORETURN_PTR __attribute__((__noreturn__))
406#elif defined(_MSC_VER)
407#define NORETURN __declspec(noreturn)
408#define NORETURN_PTR
409#else
410#define NORETURN
411#define NORETURN_PTR
412#ifndef __GNUC__
413#ifndef __attribute__
414#define __attribute__(x)
415#endif
416#endif
417#endif
418/* The sentinel attribute is valid from gcc version 4.0 */
420#if defined(__GNUC__) && (__GNUC__ >= 4)
421#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
422#else
423#define LAST_ARG_MUST_BE_NULL
424#endif
425#define MAYBE_UNUSED __attribute__((__unused__))
427#include "compat/bswap.h"
429#include "wildmatch.h"
431struct strbuf;
433/* General helper functions */
435extern void vreportf(const char *prefix, const char *err, va_list params);
436extern NORETURN void usage(const char *err);
437extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
438extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
439extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
440extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
441extern int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
442extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
443extern void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
444#ifndef NO_OPENSSL
446#ifdef APPLE_COMMON_CRYPTO
447#include "compat/apple-common-crypto.h"
448#else
449#include <openssl/evp.h>
450#include <openssl/hmac.h>
451#endif /* APPLE_COMMON_CRYPTO */
452#include <openssl/x509v3.h>
453#endif /* NO_OPENSSL */
454/*
456 * Let callers be aware of the constant return value; this can help
457 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
458 * because some compilers may not support variadic macros. Since we're only
459 * trying to help gcc, anyway, it's OK; other compilers will fall back to
460 * using the function as usual.
461 */
462#if defined(__GNUC__)
463static inline int const_error(void)
464{
465 return -1;
466}
467#define error(...) (error(__VA_ARGS__), const_error())
468#define error_errno(...) (error_errno(__VA_ARGS__), const_error())
469#endif
470extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
472extern void set_error_routine(void (*routine)(const char *err, va_list params));
473extern void (*get_error_routine(void))(const char *err, va_list params);
474extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
475extern void (*get_warn_routine(void))(const char *warn, va_list params);
476extern void set_die_is_recursing_routine(int (*routine)(void));
477extern int starts_with(const char *str, const char *prefix);
479extern int istarts_with(const char *str, const char *prefix);
480/*
482 * If the string "str" begins with the string found in "prefix", return 1.
483 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
484 * the string right after the prefix).
485 *
486 * Otherwise, return 0 and leave "out" untouched.
487 *
488 * Examples:
489 *
490 * [extract branch name, fail if not a branch]
491 * if (!skip_prefix(ref, "refs/heads/", &branch)
492 * return -1;
493 *
494 * [skip prefix if present, otherwise use whole string]
495 * skip_prefix(name, "refs/heads/", &name);
496 */
497static inline int skip_prefix(const char *str, const char *prefix,
498 const char **out)
499{
500 do {
501 if (!*prefix) {
502 *out = str;
503 return 1;
504 }
505 } while (*str++ == *prefix++);
506 return 0;
507}
508/*
510 * If the string "str" is the same as the string in "prefix", then the "arg"
511 * parameter is set to the "def" parameter and 1 is returned.
512 * If the string "str" begins with the string found in "prefix" and then a
513 * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
514 * (i.e., to the point in the string right after the prefix and the "=" sign),
515 * and 1 is returned.
516 *
517 * Otherwise, return 0 and leave "arg" untouched.
518 *
519 * When we accept both a "--key" and a "--key=<val>" option, this function
520 * can be used instead of !strcmp(arg, "--key") and then
521 * skip_prefix(arg, "--key=", &arg) to parse such an option.
522 */
523int skip_to_optional_arg_default(const char *str, const char *prefix,
524 const char **arg, const char *def);
525static inline int skip_to_optional_arg(const char *str, const char *prefix,
527 const char **arg)
528{
529 return skip_to_optional_arg_default(str, prefix, arg, "");
530}
531/*
533 * Like skip_prefix, but promises never to read past "len" bytes of the input
534 * buffer, and returns the remaining number of bytes in "out" via "outlen".
535 */
536static inline int skip_prefix_mem(const char *buf, size_t len,
537 const char *prefix,
538 const char **out, size_t *outlen)
539{
540 size_t prefix_len = strlen(prefix);
541 if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
542 *out = buf + prefix_len;
543 *outlen = len - prefix_len;
544 return 1;
545 }
546 return 0;
547}
548/*
550 * If buf ends with suffix, return 1 and subtract the length of the suffix
551 * from *len. Otherwise, return 0 and leave *len untouched.
552 */
553static inline int strip_suffix_mem(const char *buf, size_t *len,
554 const char *suffix)
555{
556 size_t suflen = strlen(suffix);
557 if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
558 return 0;
559 *len -= suflen;
560 return 1;
561}
562/*
564 * If str ends with suffix, return 1 and set *len to the size of the string
565 * without the suffix. Otherwise, return 0 and set *len to the size of the
566 * string.
567 *
568 * Note that we do _not_ NUL-terminate str to the new length.
569 */
570static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
571{
572 *len = strlen(str);
573 return strip_suffix_mem(str, len, suffix);
574}
575static inline int ends_with(const char *str, const char *suffix)
577{
578 size_t len;
579 return strip_suffix(str, suffix, &len);
580}
581#define SWAP(a, b) do { \
583 void *_swap_a_ptr = &(a); \
584 void *_swap_b_ptr = &(b); \
585 unsigned char _swap_buffer[sizeof(a)]; \
586 memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \
587 memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) + \
588 BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b))); \
589 memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \
590} while (0)
591#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
593#ifndef PROT_READ
595#define PROT_READ 1
596#define PROT_WRITE 2
597#define MAP_PRIVATE 1
598#endif
599#define mmap git_mmap
601#define munmap git_munmap
602extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
603extern int git_munmap(void *start, size_t length);
604#else /* NO_MMAP || USE_WIN32_MMAP */
606#include <sys/mman.h>
608#endif /* NO_MMAP || USE_WIN32_MMAP */
610#ifdef NO_MMAP
612/* This value must be multiple of (pagesize * 2) */
614#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
615#else /* NO_MMAP */
617/* This value must be multiple of (pagesize * 2) */
619#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
620 (sizeof(void*) >= 8 \
621 ? 1 * 1024 * 1024 * 1024 \
622 : 32 * 1024 * 1024)
623#endif /* NO_MMAP */
625#ifndef MAP_FAILED
627#define MAP_FAILED ((void *)-1)
628#endif
629#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
631#define on_disk_bytes(st) ((st).st_size)
632#else
633#define on_disk_bytes(st) ((st).st_blocks * 512)
634#endif
635#ifdef NEEDS_MODE_TRANSLATION
637#undef S_IFMT
638#undef S_IFREG
639#undef S_IFDIR
640#undef S_IFLNK
641#undef S_IFBLK
642#undef S_IFCHR
643#undef S_IFIFO
644#undef S_IFSOCK
645#define S_IFMT 0170000
646#define S_IFREG 0100000
647#define S_IFDIR 0040000
648#define S_IFLNK 0120000
649#define S_IFBLK 0060000
650#define S_IFCHR 0020000
651#define S_IFIFO 0010000
652#define S_IFSOCK 0140000
653#ifdef stat
654#undef stat
655#endif
656#define stat(path, buf) git_stat(path, buf)
657extern int git_stat(const char *, struct stat *);
658#ifdef fstat
659#undef fstat
660#endif
661#define fstat(fd, buf) git_fstat(fd, buf)
662extern int git_fstat(int, struct stat *);
663#ifdef lstat
664#undef lstat
665#endif
666#define lstat(path, buf) git_lstat(path, buf)
667extern int git_lstat(const char *, struct stat *);
668#endif
669#define DEFAULT_PACKED_GIT_LIMIT \
671 ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
672#ifdef NO_PREAD
674#define pread git_pread
675extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
676#endif
677/*
678 * Forward decl that will remind us if its twin in cache.h changes.
679 * This function is used in compat/pread.c. But we can't include
680 * cache.h there.
681 */
682extern ssize_t read_in_full(int fd, void *buf, size_t count);
683#ifdef NO_SETENV
685#define setenv gitsetenv
686extern int gitsetenv(const char *, const char *, int);
687#endif
688#ifdef NO_MKDTEMP
690#define mkdtemp gitmkdtemp
691extern char *gitmkdtemp(char *);
692#endif
693#ifdef NO_UNSETENV
695#define unsetenv gitunsetenv
696extern void gitunsetenv(const char *);
697#endif
698#ifdef NO_STRCASESTR
700#define strcasestr gitstrcasestr
701extern char *gitstrcasestr(const char *haystack, const char *needle);
702#endif
703#ifdef NO_STRLCPY
705#define strlcpy gitstrlcpy
706extern size_t gitstrlcpy(char *, const char *, size_t);
707#endif
708#ifdef NO_STRTOUMAX
710#define strtoumax gitstrtoumax
711extern uintmax_t gitstrtoumax(const char *, char **, int);
712#define strtoimax gitstrtoimax
713extern intmax_t gitstrtoimax(const char *, char **, int);
714#endif
715#ifdef NO_HSTRERROR
717#define hstrerror githstrerror
718extern const char *githstrerror(int herror);
719#endif
720#ifdef NO_MEMMEM
722#define memmem gitmemmem
723void *gitmemmem(const void *haystack, size_t haystacklen,
724 const void *needle, size_t needlelen);
725#endif
726#ifdef OVERRIDE_STRDUP
728#ifdef strdup
729#undef strdup
730#endif
731#define strdup gitstrdup
732char *gitstrdup(const char *s);
733#endif
734#ifdef NO_GETPAGESIZE
736#define getpagesize() sysconf(_SC_PAGESIZE)
737#endif
738#ifndef O_CLOEXEC
740#define O_CLOEXEC 0
741#endif
742#ifdef FREAD_READS_DIRECTORIES
744# if !defined(SUPPRESS_FOPEN_REDEFINITION)
745# ifdef fopen
746# undef fopen
747# endif
748# define fopen(a,b) git_fopen(a,b)
749# endif
750extern FILE *git_fopen(const char*, const char*);
751#endif
752#ifdef SNPRINTF_RETURNS_BOGUS
754#ifdef snprintf
755#undef snprintf
756#endif
757#define snprintf git_snprintf
758extern int git_snprintf(char *str, size_t maxsize,
759 const char *format, ...);
760#ifdef vsnprintf
761#undef vsnprintf
762#endif
763#define vsnprintf git_vsnprintf
764extern int git_vsnprintf(char *str, size_t maxsize,
765 const char *format, va_list ap);
766#endif
767#ifdef __GLIBC_PREREQ
769#if __GLIBC_PREREQ(2, 1)
770#define HAVE_STRCHRNUL
771#endif
772#endif
773#ifndef HAVE_STRCHRNUL
775#define strchrnul gitstrchrnul
776static inline char *gitstrchrnul(const char *s, int c)
777{
778 while (*s && *s != c)
779 s++;
780 return (char *)s;
781}
782#endif
783#ifdef NO_INET_PTON
785int inet_pton(int af, const char *src, void *dst);
786#endif
787#ifdef NO_INET_NTOP
789const char *inet_ntop(int af, const void *src, char *dst, size_t size);
790#endif
791#ifdef NO_PTHREADS
793#define atexit git_atexit
794extern int git_atexit(void (*handler)(void));
795#endif
796typedef void (*try_to_free_t)(size_t);
798extern try_to_free_t set_try_to_free_routine(try_to_free_t);
799static inline size_t st_add(size_t a, size_t b)
801{
802 if (unsigned_add_overflows(a, b))
803 die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
804 (uintmax_t)a, (uintmax_t)b);
805 return a + b;
806}
807#define st_add3(a,b,c) st_add(st_add((a),(b)),(c))
808#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
809static inline size_t st_mult(size_t a, size_t b)
811{
812 if (unsigned_mult_overflows(a, b))
813 die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
814 (uintmax_t)a, (uintmax_t)b);
815 return a * b;
816}
817static inline size_t st_sub(size_t a, size_t b)
819{
820 if (a < b)
821 die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
822 (uintmax_t)a, (uintmax_t)b);
823 return a - b;
824}
825#ifdef HAVE_ALLOCA_H
827# include <alloca.h>
828# define xalloca(size) (alloca(size))
829# define xalloca_free(p) do {} while (0)
830#else
831# define xalloca(size) (xmalloc(size))
832# define xalloca_free(p) (free(p))
833#endif
834extern char *xstrdup(const char *str);
835extern void *xmalloc(size_t size);
836extern void *xmallocz(size_t size);
837extern void *xmallocz_gently(size_t size);
838extern void *xmemdupz(const void *data, size_t len);
839extern char *xstrndup(const char *str, size_t len);
840extern void *xrealloc(void *ptr, size_t size);
841extern void *xcalloc(size_t nmemb, size_t size);
842extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
843extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
844extern int xopen(const char *path, int flags, ...);
845extern ssize_t xread(int fd, void *buf, size_t len);
846extern ssize_t xwrite(int fd, const void *buf, size_t len);
847extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
848extern int xdup(int fd);
849extern FILE *xfopen(const char *path, const char *mode);
850extern FILE *xfdopen(int fd, const char *mode);
851extern int xmkstemp(char *temp_filename);
852extern int xmkstemp_mode(char *temp_filename, int mode);
853extern char *xgetcwd(void);
854extern FILE *fopen_for_writing(const char *path);
855extern FILE *fopen_or_warn(const char *path, const char *mode);
856/*
858 * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
859 * that ptr is used twice, so don't pass e.g. ptr++.
860 */
861#define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
862#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
864#define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x)));
865#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
866#define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
868 BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
869static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
870{
871 if (n)
872 memcpy(dst, src, st_mult(size, n));
873}
874#define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
876 BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
877static inline void move_array(void *dst, const void *src, size_t n, size_t size)
878{
879 if (n)
880 memmove(dst, src, st_mult(size, n));
881}
882/*
884 * These functions help you allocate structs with flex arrays, and copy
885 * the data directly into the array. For example, if you had:
886 *
887 * struct foo {
888 * int bar;
889 * char name[FLEX_ARRAY];
890 * };
891 *
892 * you can do:
893 *
894 * struct foo *f;
895 * FLEX_ALLOC_MEM(f, name, src, len);
896 *
897 * to allocate a "foo" with the contents of "src" in the "name" field.
898 * The resulting struct is automatically zero'd, and the flex-array field
899 * is NUL-terminated (whether the incoming src buffer was or not).
900 *
901 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
902 * but do want to store a pointer to some extra data in the same allocated
903 * block. For example, if you have:
904 *
905 * struct foo {
906 * char *name;
907 * int bar;
908 * };
909 *
910 * you can do:
911 *
912 * struct foo *f;
913 * FLEXPTR_ALLOC_STR(f, name, src);
914 *
915 * and "name" will point to a block of memory after the struct, which will be
916 * freed along with the struct (but the pointer can be repointed anywhere).
917 *
918 * The *_STR variants accept a string parameter rather than a ptr/len
919 * combination.
920 *
921 * Note that these macros will evaluate the first parameter multiple
922 * times, and it must be assignable as an lvalue.
923 */
924#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
925 size_t flex_array_len_ = (len); \
926 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
927 memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
928} while (0)
929#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
930 size_t flex_array_len_ = (len); \
931 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
932 memcpy((x) + 1, (buf), flex_array_len_); \
933 (x)->ptrname = (void *)((x)+1); \
934} while(0)
935#define FLEX_ALLOC_STR(x, flexname, str) \
936 FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
937#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
938 FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
939static inline char *xstrdup_or_null(const char *str)
941{
942 return str ? xstrdup(str) : NULL;
943}
944static inline size_t xsize_t(off_t len)
946{
947 size_t size = (size_t) len;
948 if (len != (off_t) size)
950 die("Cannot handle files this big");
951 return size;
952}
953__attribute__((format (printf, 3, 4)))
955extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
956#ifndef HOST_NAME_MAX
958#define HOST_NAME_MAX 256
959#endif
960extern int xgethostname(char *buf, size_t len);
962/* in ctype.c, for kwset users */
964extern const unsigned char tolower_trans_tbl[256];
965/* Sane ctype - no locale, and works with signed chars */
967#undef isascii
968#undef isspace
969#undef isdigit
970#undef isalpha
971#undef isalnum
972#undef isprint
973#undef islower
974#undef isupper
975#undef tolower
976#undef toupper
977#undef iscntrl
978#undef ispunct
979#undef isxdigit
980extern const unsigned char sane_ctype[256];
982#define GIT_SPACE 0x01
983#define GIT_DIGIT 0x02
984#define GIT_ALPHA 0x04
985#define GIT_GLOB_SPECIAL 0x08
986#define GIT_REGEX_SPECIAL 0x10
987#define GIT_PATHSPEC_MAGIC 0x20
988#define GIT_CNTRL 0x40
989#define GIT_PUNCT 0x80
990#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
991#define isascii(x) (((x) & ~0x7f) == 0)
992#define isspace(x) sane_istest(x,GIT_SPACE)
993#define isdigit(x) sane_istest(x,GIT_DIGIT)
994#define isalpha(x) sane_istest(x,GIT_ALPHA)
995#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
996#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
997#define islower(x) sane_iscase(x, 1)
998#define isupper(x) sane_iscase(x, 0)
999#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
1000#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
1001#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
1002#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
1003 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
1004#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
1005#define tolower(x) sane_case((unsigned char)(x), 0x20)
1006#define toupper(x) sane_case((unsigned char)(x), 0)
1007#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
1008static inline int sane_case(int x, int high)
1010{
1011 if (sane_istest(x, GIT_ALPHA))
1012 x = (x & ~0x20) | high;
1013 return x;
1014}
1015static inline int sane_iscase(int x, int is_lower)
1017{
1018 if (!sane_istest(x, GIT_ALPHA))
1019 return 0;
1020 if (is_lower)
1022 return (x & 0x20) != 0;
1023 else
1024 return (x & 0x20) == 0;
1025}
1026/*
1028 * Like skip_prefix, but compare case-insensitively. Note that the comparison
1029 * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1030 * locale-specific conversions).
1031 */
1032static inline int skip_iprefix(const char *str, const char *prefix,
1033 const char **out)
1034{
1035 do {
1036 if (!*prefix) {
1037 *out = str;
1038 return 1;
1039 }
1040 } while (tolower(*str++) == tolower(*prefix++));
1041 return 0;
1042}
1043static inline int strtoul_ui(char const *s, int base, unsigned int *result)
1045{
1046 unsigned long ul;
1047 char *p;
1048 errno = 0;
1050 /* negative values would be accepted by strtoul */
1051 if (strchr(s, '-'))
1052 return -1;
1053 ul = strtoul(s, &p, base);
1054 if (errno || *p || p == s || (unsigned int) ul != ul)
1055 return -1;
1056 *result = ul;
1057 return 0;
1058}
1059static inline int strtol_i(char const *s, int base, int *result)
1061{
1062 long ul;
1063 char *p;
1064 errno = 0;
1066 ul = strtol(s, &p, base);
1067 if (errno || *p || p == s || (int) ul != ul)
1068 return -1;
1069 *result = ul;
1070 return 0;
1071}
1072#ifdef INTERNAL_QSORT
1074void git_qsort(void *base, size_t nmemb, size_t size,
1075 int(*compar)(const void *, const void *));
1076#define qsort git_qsort
1077#endif
1078#define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1080static inline void sane_qsort(void *base, size_t nmemb, size_t size,
1081 int(*compar)(const void *, const void *))
1082{
1083 if (nmemb > 1)
1084 qsort(base, nmemb, size, compar);
1085}
1086#ifndef HAVE_ISO_QSORT_S
1088int git_qsort_s(void *base, size_t nmemb, size_t size,
1089 int (*compar)(const void *, const void *, void *), void *ctx);
1090#define qsort_s git_qsort_s
1091#endif
1092#define QSORT_S(base, n, compar, ctx) do { \
1094 if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1095 BUG("qsort_s() failed"); \
1096} while (0)
1097#ifndef REG_STARTEND
1099#error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1100#endif
1101static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1103 size_t nmatch, regmatch_t pmatch[], int eflags)
1104{
1105 assert(nmatch > 0 && pmatch);
1106 pmatch[0].rm_so = 0;
1107 pmatch[0].rm_eo = size;
1108 return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1109}
1110#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1112# define FORCE_DIR_SET_GID S_ISGID
1113#else
1114# define FORCE_DIR_SET_GID 0
1115#endif
1116#ifdef NO_NSEC
1118#undef USE_NSEC
1119#define ST_CTIME_NSEC(st) 0
1120#define ST_MTIME_NSEC(st) 0
1121#else
1122#ifdef USE_ST_TIMESPEC
1123#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1124#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1125#else
1126#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1127#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1128#endif
1129#endif
1130#ifdef UNRELIABLE_FSTAT
1132#define fstat_is_reliable() 0
1133#else
1134#define fstat_is_reliable() 1
1135#endif
1136#ifndef va_copy
1138/*
1139 * Since an obvious implementation of va_list would be to make it a
1140 * pointer into the stack frame, a simple assignment will work on
1141 * many systems. But let's try to be more portable.
1142 */
1143#ifdef __va_copy
1144#define va_copy(dst, src) __va_copy(dst, src)
1145#else
1146#define va_copy(dst, src) ((dst) = (src))
1147#endif
1148#endif
1149#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
1151#define HAVE_VARIADIC_MACROS 1
1152#endif
1153/* usage.c: only to be used for testing BUG() implementation (see test-tool) */
1155extern int BUG_exit_code;
1156#ifdef HAVE_VARIADIC_MACROS
1158__attribute__((format (printf, 3, 4))) NORETURN
1159void BUG_fl(const char *file, int line, const char *fmt, ...);
1160#define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1161#else
1162__attribute__((format (printf, 1, 2))) NORETURN
1163void BUG(const char *fmt, ...);
1164#endif
1165/*
1167 * Preserves errno, prints a message, but gives no warning for ENOENT.
1168 * Returns 0 on success, which includes trying to unlink an object that does
1169 * not exist.
1170 */
1171int unlink_or_warn(const char *path);
1172 /*
1173 * Tries to unlink file. Returns 0 if unlink succeeded
1174 * or the file already didn't exist. Returns -1 and
1175 * appends a message to err suitable for
1176 * 'error("%s", err->buf)' on error.
1177 */
1178int unlink_or_msg(const char *file, struct strbuf *err);
1179/*
1180 * Preserves errno, prints a message, but gives no warning for ENOENT.
1181 * Returns 0 on success, which includes trying to remove a directory that does
1182 * not exist.
1183 */
1184int rmdir_or_warn(const char *path);
1185/*
1186 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1187 * the supplied file mode.
1188 */
1189int remove_or_warn(unsigned int mode, const char *path);
1190/*
1192 * Call access(2), but warn for any error except "missing file"
1193 * (ENOENT or ENOTDIR).
1194 */
1195#define ACCESS_EACCES_OK (1U << 0)
1196int access_or_warn(const char *path, int mode, unsigned flag);
1197int access_or_die(const char *path, int mode, unsigned flag);
1198/* Warn on an inaccessible file if errno indicates this is an error */
1200int warn_on_fopen_errors(const char *path);
1201#ifdef GMTIME_UNRELIABLE_ERRORS
1203struct tm *git_gmtime(const time_t *);
1204struct tm *git_gmtime_r(const time_t *, struct tm *);
1205#define gmtime git_gmtime
1206#define gmtime_r git_gmtime_r
1207#endif
1208#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1210#define USE_PARENS_AROUND_GETTEXT_N 1
1211#endif
1212#ifndef SHELL_PATH
1214# define SHELL_PATH "/bin/sh"
1215#endif
1216#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1218#define flockfile(fh)
1219#define funlockfile(fh)
1220#define getc_unlocked(fh) getc(fh)
1221#endif
1222/*
1224 * Our code often opens a path to an optional file, to work on its
1225 * contents when we can successfully open it. We can ignore a failure
1226 * to open if such an optional file does not exist, but we do want to
1227 * report a failure in opening for other reasons (e.g. we got an I/O
1228 * error, or the file is there, but we lack the permission to open).
1229 *
1230 * Call this function after seeing an error from open() or fopen() to
1231 * see if the errno indicates a missing file that we can safely ignore.
1232 */
1233static inline int is_missing_file_error(int errno_)
1234{
1235 return (errno_ == ENOENT || errno_ == ENOTDIR);
1236}
1237extern int cmd_main(int, const char **);
1239/*
1241 * You can mark a stack variable with UNLEAK(var) to avoid it being
1242 * reported as a leak by tools like LSAN or valgrind. The argument
1243 * should generally be the variable itself (not its address and not what
1244 * it points to). It's safe to use this on pointers which may already
1245 * have been freed, or on pointers which may still be in use.
1246 *
1247 * Use this _only_ for a variable that leaks by going out of scope at
1248 * program exit (so only from cmd_* functions or their direct helpers).
1249 * Normal functions, especially those which may be called multiple
1250 * times, should actually free their memory. This is only meant as
1251 * an annotation, and does nothing in non-leak-checking builds.
1252 */
1253#ifdef SUPPRESS_ANNOTATED_LEAKS
1254extern void unleak_memory(const void *ptr, size_t len);
1255#define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1256#else
1257#define UNLEAK(var) do {} while (0)
1258#endif
1259/*
1261 * This include must come after system headers, since it introduces macros that
1262 * replace system names.
1263 */
1264#include "banned.h"
1265#endif