fc1b5fe1a6c89be9415fa5688fa23dde53eedbf7
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 (_MSC_VER) && !defined(_WIN32_WINNT)
150# define _WIN32_WINNT 0x0502
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#ifndef NO_SYS_POLL_H
184#include <sys/poll.h>
185#else
186#include <poll.h>
187#endif
188#ifdef HAVE_BSD_SYSCTL
189#include <sys/sysctl.h>
190#endif
191#if defined(__MINGW32__)
193/* pull in Windows compatibility stuff */
194#include "compat/mingw.h"
195#elif defined(_MSC_VER)
196#include "compat/msvc.h"
197#else
198#include <sys/utsname.h>
199#include <sys/wait.h>
200#include <sys/resource.h>
201#include <sys/socket.h>
202#include <sys/ioctl.h>
203#include <termios.h>
204#ifndef NO_SYS_SELECT_H
205#include <sys/select.h>
206#endif
207#include <netinet/in.h>
208#include <netinet/tcp.h>
209#include <arpa/inet.h>
210#include <netdb.h>
211#include <pwd.h>
212#include <sys/un.h>
213#ifndef NO_INTTYPES_H
214#include <inttypes.h>
215#else
216#include <stdint.h>
217#endif
218#ifdef NO_INTPTR_T
219/*
220 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
221 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
222 * while on IP16 and IP16L32 it is "int" (resp. "short")
223 * Size needs to match (or exceed) 'sizeof(void *)'.
224 * We can't take "long long" here as not everybody has it.
225 */
226typedef long intptr_t;
227typedef unsigned long uintptr_t;
228#endif
229#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
230#include <grp.h>
231#define _ALL_SOURCE 1
232#endif
233/* used on Mac OS X */
235#ifdef PRECOMPOSE_UNICODE
236#include "compat/precompose_utf8.h"
237#else
238#define precompose_str(in,i_nfd2nfc)
239#define precompose_argv(c,v)
240#define probe_utf8_pathname_composition()
241#endif
242#ifdef MKDIR_WO_TRAILING_SLASH
244#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
245extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
246#endif
247#ifdef NO_STRUCT_ITIMERVAL
249struct itimerval {
250 struct timeval it_interval;
251 struct timeval it_value;
252};
253#endif
254#ifdef NO_SETITIMER
256#define setitimer(which,value,ovalue)
257#endif
258#ifndef NO_LIBGEN_H
260#include <libgen.h>
261#else
262#define basename gitbasename
263extern char *gitbasename(char *);
264#define dirname gitdirname
265extern char *gitdirname(char *);
266#endif
267#ifndef NO_ICONV
269#include <iconv.h>
270#endif
271#ifndef NO_OPENSSL
273#ifdef __APPLE__
274#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
275#include <AvailabilityMacros.h>
276#undef DEPRECATED_ATTRIBUTE
277#define DEPRECATED_ATTRIBUTE
278#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
279#endif
280#include <openssl/ssl.h>
281#include <openssl/err.h>
282#endif
283/* On most systems <netdb.h> would have given us this, but
285 * not on some systems (e.g. z/OS).
286 */
287#ifndef NI_MAXHOST
288#define NI_MAXHOST 1025
289#endif
290#ifndef NI_MAXSERV
292#define NI_MAXSERV 32
293#endif
294/* On most systems <limits.h> would have given us this, but
296 * not on some systems (e.g. GNU/Hurd).
297 */
298#ifndef PATH_MAX
299#define PATH_MAX 4096
300#endif
301#ifndef PRIuMAX
303#define PRIuMAX "llu"
304#endif
305#ifndef SCNuMAX
307#define SCNuMAX PRIuMAX
308#endif
309#ifndef PRIu32
311#define PRIu32 "u"
312#endif
313#ifndef PRIx32
315#define PRIx32 "x"
316#endif
317#ifndef PRIo32
319#define PRIo32 "o"
320#endif
321#define parse_timestamp strtoul
323#ifndef PATH_SEP
325#define PATH_SEP ':'
326#endif
327#ifdef HAVE_PATHS_H
329#include <paths.h>
330#endif
331#ifndef _PATH_DEFPATH
332#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
333#endif
334#ifndef has_dos_drive_prefix
336static inline int git_has_dos_drive_prefix(const char *path)
337{
338 return 0;
339}
340#define has_dos_drive_prefix git_has_dos_drive_prefix
341#endif
342#ifndef skip_dos_drive_prefix
344static inline int git_skip_dos_drive_prefix(char **path)
345{
346 return 0;
347}
348#define skip_dos_drive_prefix git_skip_dos_drive_prefix
349#endif
350#ifndef is_dir_sep
352static inline int git_is_dir_sep(int c)
353{
354 return c == '/';
355}
356#define is_dir_sep git_is_dir_sep
357#endif
358#ifndef offset_1st_component
360static inline int git_offset_1st_component(const char *path)
361{
362 return is_dir_sep(path[0]);
363}
364#define offset_1st_component git_offset_1st_component
365#endif
366#ifndef find_last_dir_sep
368static inline char *git_find_last_dir_sep(const char *path)
369{
370 return strrchr(path, '/');
371}
372#define find_last_dir_sep git_find_last_dir_sep
373#endif
374#if defined(__HP_cc) && (__HP_cc >= 61000)
376#define NORETURN __attribute__((noreturn))
377#define NORETURN_PTR
378#elif defined(__GNUC__) && !defined(NO_NORETURN)
379#define NORETURN __attribute__((__noreturn__))
380#define NORETURN_PTR __attribute__((__noreturn__))
381#elif defined(_MSC_VER)
382#define NORETURN __declspec(noreturn)
383#define NORETURN_PTR
384#else
385#define NORETURN
386#define NORETURN_PTR
387#ifndef __GNUC__
388#ifndef __attribute__
389#define __attribute__(x)
390#endif
391#endif
392#endif
393/* The sentinel attribute is valid from gcc version 4.0 */
395#if defined(__GNUC__) && (__GNUC__ >= 4)
396#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
397#else
398#define LAST_ARG_MUST_BE_NULL
399#endif
400#include "compat/bswap.h"
402#include "wildmatch.h"
404struct strbuf;
406/* General helper functions */
408extern void vreportf(const char *prefix, const char *err, va_list params);
409extern NORETURN void usage(const char *err);
410extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
411extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
412extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
413extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
414extern int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
415extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
416extern void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
417#ifndef NO_OPENSSL
419#ifdef APPLE_COMMON_CRYPTO
420#include "compat/apple-common-crypto.h"
421#else
422#include <openssl/evp.h>
423#include <openssl/hmac.h>
424#endif /* APPLE_COMMON_CRYPTO */
425#include <openssl/x509v3.h>
426#endif /* NO_OPENSSL */
427/*
429 * Let callers be aware of the constant return value; this can help
430 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
431 * because some compilers may not support variadic macros. Since we're only
432 * trying to help gcc, anyway, it's OK; other compilers will fall back to
433 * using the function as usual.
434 */
435#if defined(__GNUC__)
436static inline int const_error(void)
437{
438 return -1;
439}
440#define error(...) (error(__VA_ARGS__), const_error())
441#define error_errno(...) (error_errno(__VA_ARGS__), const_error())
442#endif
443extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
445extern void set_error_routine(void (*routine)(const char *err, va_list params));
446extern void (*get_error_routine(void))(const char *err, va_list params);
447extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
448extern void (*get_warn_routine(void))(const char *warn, va_list params);
449extern void set_die_is_recursing_routine(int (*routine)(void));
450extern void set_error_handle(FILE *);
451extern int starts_with(const char *str, const char *prefix);
453/*
455 * If the string "str" begins with the string found in "prefix", return 1.
456 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
457 * the string right after the prefix).
458 *
459 * Otherwise, return 0 and leave "out" untouched.
460 *
461 * Examples:
462 *
463 * [extract branch name, fail if not a branch]
464 * if (!skip_prefix(ref, "refs/heads/", &branch)
465 * return -1;
466 *
467 * [skip prefix if present, otherwise use whole string]
468 * skip_prefix(name, "refs/heads/", &name);
469 */
470static inline int skip_prefix(const char *str, const char *prefix,
471 const char **out)
472{
473 do {
474 if (!*prefix) {
475 *out = str;
476 return 1;
477 }
478 } while (*str++ == *prefix++);
479 return 0;
480}
481/*
483 * Like skip_prefix, but promises never to read past "len" bytes of the input
484 * buffer, and returns the remaining number of bytes in "out" via "outlen".
485 */
486static inline int skip_prefix_mem(const char *buf, size_t len,
487 const char *prefix,
488 const char **out, size_t *outlen)
489{
490 size_t prefix_len = strlen(prefix);
491 if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
492 *out = buf + prefix_len;
493 *outlen = len - prefix_len;
494 return 1;
495 }
496 return 0;
497}
498/*
500 * If buf ends with suffix, return 1 and subtract the length of the suffix
501 * from *len. Otherwise, return 0 and leave *len untouched.
502 */
503static inline int strip_suffix_mem(const char *buf, size_t *len,
504 const char *suffix)
505{
506 size_t suflen = strlen(suffix);
507 if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
508 return 0;
509 *len -= suflen;
510 return 1;
511}
512/*
514 * If str ends with suffix, return 1 and set *len to the size of the string
515 * without the suffix. Otherwise, return 0 and set *len to the size of the
516 * string.
517 *
518 * Note that we do _not_ NUL-terminate str to the new length.
519 */
520static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
521{
522 *len = strlen(str);
523 return strip_suffix_mem(str, len, suffix);
524}
525static inline int ends_with(const char *str, const char *suffix)
527{
528 size_t len;
529 return strip_suffix(str, suffix, &len);
530}
531#define SWAP(a, b) do { \
533 void *_swap_a_ptr = &(a); \
534 void *_swap_b_ptr = &(b); \
535 unsigned char _swap_buffer[sizeof(a)]; \
536 memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \
537 memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) + \
538 BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b))); \
539 memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \
540} while (0)
541#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
543#ifndef PROT_READ
545#define PROT_READ 1
546#define PROT_WRITE 2
547#define MAP_PRIVATE 1
548#endif
549#define mmap git_mmap
551#define munmap git_munmap
552extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
553extern int git_munmap(void *start, size_t length);
554#else /* NO_MMAP || USE_WIN32_MMAP */
556#include <sys/mman.h>
558#endif /* NO_MMAP || USE_WIN32_MMAP */
560#ifdef NO_MMAP
562/* This value must be multiple of (pagesize * 2) */
564#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
565#else /* NO_MMAP */
567/* This value must be multiple of (pagesize * 2) */
569#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
570 (sizeof(void*) >= 8 \
571 ? 1 * 1024 * 1024 * 1024 \
572 : 32 * 1024 * 1024)
573#endif /* NO_MMAP */
575#ifndef MAP_FAILED
577#define MAP_FAILED ((void *)-1)
578#endif
579#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
581#define on_disk_bytes(st) ((st).st_size)
582#else
583#define on_disk_bytes(st) ((st).st_blocks * 512)
584#endif
585#ifdef NEEDS_MODE_TRANSLATION
587#undef S_IFMT
588#undef S_IFREG
589#undef S_IFDIR
590#undef S_IFLNK
591#undef S_IFBLK
592#undef S_IFCHR
593#undef S_IFIFO
594#undef S_IFSOCK
595#define S_IFMT 0170000
596#define S_IFREG 0100000
597#define S_IFDIR 0040000
598#define S_IFLNK 0120000
599#define S_IFBLK 0060000
600#define S_IFCHR 0020000
601#define S_IFIFO 0010000
602#define S_IFSOCK 0140000
603#ifdef stat
604#undef stat
605#endif
606#define stat(path, buf) git_stat(path, buf)
607extern int git_stat(const char *, struct stat *);
608#ifdef fstat
609#undef fstat
610#endif
611#define fstat(fd, buf) git_fstat(fd, buf)
612extern int git_fstat(int, struct stat *);
613#ifdef lstat
614#undef lstat
615#endif
616#define lstat(path, buf) git_lstat(path, buf)
617extern int git_lstat(const char *, struct stat *);
618#endif
619#define DEFAULT_PACKED_GIT_LIMIT \
621 ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
622#ifdef NO_PREAD
624#define pread git_pread
625extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
626#endif
627/*
628 * Forward decl that will remind us if its twin in cache.h changes.
629 * This function is used in compat/pread.c. But we can't include
630 * cache.h there.
631 */
632extern ssize_t read_in_full(int fd, void *buf, size_t count);
633#ifdef NO_SETENV
635#define setenv gitsetenv
636extern int gitsetenv(const char *, const char *, int);
637#endif
638#ifdef NO_MKDTEMP
640#define mkdtemp gitmkdtemp
641extern char *gitmkdtemp(char *);
642#endif
643#ifdef NO_UNSETENV
645#define unsetenv gitunsetenv
646extern void gitunsetenv(const char *);
647#endif
648#ifdef NO_STRCASESTR
650#define strcasestr gitstrcasestr
651extern char *gitstrcasestr(const char *haystack, const char *needle);
652#endif
653#ifdef NO_STRLCPY
655#define strlcpy gitstrlcpy
656extern size_t gitstrlcpy(char *, const char *, size_t);
657#endif
658#ifdef NO_STRTOUMAX
660#define strtoumax gitstrtoumax
661extern uintmax_t gitstrtoumax(const char *, char **, int);
662#define strtoimax gitstrtoimax
663extern intmax_t gitstrtoimax(const char *, char **, int);
664#endif
665#ifdef NO_HSTRERROR
667#define hstrerror githstrerror
668extern const char *githstrerror(int herror);
669#endif
670#ifdef NO_MEMMEM
672#define memmem gitmemmem
673void *gitmemmem(const void *haystack, size_t haystacklen,
674 const void *needle, size_t needlelen);
675#endif
676#ifdef OVERRIDE_STRDUP
678#ifdef strdup
679#undef strdup
680#endif
681#define strdup gitstrdup
682char *gitstrdup(const char *s);
683#endif
684#ifdef NO_GETPAGESIZE
686#define getpagesize() sysconf(_SC_PAGESIZE)
687#endif
688#ifndef O_CLOEXEC
690#define O_CLOEXEC 0
691#endif
692#ifdef FREAD_READS_DIRECTORIES
694#ifdef fopen
695#undef fopen
696#endif
697#define fopen(a,b) git_fopen(a,b)
698extern FILE *git_fopen(const char*, const char*);
699#endif
700#ifdef SNPRINTF_RETURNS_BOGUS
702#ifdef snprintf
703#undef snprintf
704#endif
705#define snprintf git_snprintf
706extern int git_snprintf(char *str, size_t maxsize,
707 const char *format, ...);
708#ifdef vsnprintf
709#undef vsnprintf
710#endif
711#define vsnprintf git_vsnprintf
712extern int git_vsnprintf(char *str, size_t maxsize,
713 const char *format, va_list ap);
714#endif
715#ifdef __GLIBC_PREREQ
717#if __GLIBC_PREREQ(2, 1)
718#define HAVE_STRCHRNUL
719#endif
720#endif
721#ifndef HAVE_STRCHRNUL
723#define strchrnul gitstrchrnul
724static inline char *gitstrchrnul(const char *s, int c)
725{
726 while (*s && *s != c)
727 s++;
728 return (char *)s;
729}
730#endif
731#ifdef NO_INET_PTON
733int inet_pton(int af, const char *src, void *dst);
734#endif
735#ifdef NO_INET_NTOP
737const char *inet_ntop(int af, const void *src, char *dst, size_t size);
738#endif
739#ifdef NO_PTHREADS
741#define atexit git_atexit
742extern int git_atexit(void (*handler)(void));
743#endif
744extern void release_pack_memory(size_t);
746typedef void (*try_to_free_t)(size_t);
748extern try_to_free_t set_try_to_free_routine(try_to_free_t);
749static inline size_t st_add(size_t a, size_t b)
751{
752 if (unsigned_add_overflows(a, b))
753 die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
754 (uintmax_t)a, (uintmax_t)b);
755 return a + b;
756}
757#define st_add3(a,b,c) st_add(st_add((a),(b)),(c))
758#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
759static inline size_t st_mult(size_t a, size_t b)
761{
762 if (unsigned_mult_overflows(a, b))
763 die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
764 (uintmax_t)a, (uintmax_t)b);
765 return a * b;
766}
767static inline size_t st_sub(size_t a, size_t b)
769{
770 if (a < b)
771 die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
772 (uintmax_t)a, (uintmax_t)b);
773 return a - b;
774}
775#ifdef HAVE_ALLOCA_H
777# include <alloca.h>
778# define xalloca(size) (alloca(size))
779# define xalloca_free(p) do {} while (0)
780#else
781# define xalloca(size) (xmalloc(size))
782# define xalloca_free(p) (free(p))
783#endif
784extern char *xstrdup(const char *str);
785extern void *xmalloc(size_t size);
786extern void *xmallocz(size_t size);
787extern void *xmallocz_gently(size_t size);
788extern void *xmemdupz(const void *data, size_t len);
789extern char *xstrndup(const char *str, size_t len);
790extern void *xrealloc(void *ptr, size_t size);
791extern void *xcalloc(size_t nmemb, size_t size);
792extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
793extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
794extern int xopen(const char *path, int flags, ...);
795extern ssize_t xread(int fd, void *buf, size_t len);
796extern ssize_t xwrite(int fd, const void *buf, size_t len);
797extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
798extern int xdup(int fd);
799extern FILE *xfopen(const char *path, const char *mode);
800extern FILE *xfdopen(int fd, const char *mode);
801extern int xmkstemp(char *template);
802extern int xmkstemp_mode(char *template, int mode);
803extern char *xgetcwd(void);
804extern FILE *fopen_for_writing(const char *path);
805#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
807#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
808#define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
810 BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
811static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
812{
813 if (n)
814 memcpy(dst, src, st_mult(size, n));
815}
816/*
818 * These functions help you allocate structs with flex arrays, and copy
819 * the data directly into the array. For example, if you had:
820 *
821 * struct foo {
822 * int bar;
823 * char name[FLEX_ARRAY];
824 * };
825 *
826 * you can do:
827 *
828 * struct foo *f;
829 * FLEX_ALLOC_MEM(f, name, src, len);
830 *
831 * to allocate a "foo" with the contents of "src" in the "name" field.
832 * The resulting struct is automatically zero'd, and the flex-array field
833 * is NUL-terminated (whether the incoming src buffer was or not).
834 *
835 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
836 * but do want to store a pointer to some extra data in the same allocated
837 * block. For example, if you have:
838 *
839 * struct foo {
840 * char *name;
841 * int bar;
842 * };
843 *
844 * you can do:
845 *
846 * struct foo *f;
847 * FLEXPTR_ALLOC_STR(f, name, src);
848 *
849 * and "name" will point to a block of memory after the struct, which will be
850 * freed along with the struct (but the pointer can be repointed anywhere).
851 *
852 * The *_STR variants accept a string parameter rather than a ptr/len
853 * combination.
854 *
855 * Note that these macros will evaluate the first parameter multiple
856 * times, and it must be assignable as an lvalue.
857 */
858#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
859 size_t flex_array_len_ = (len); \
860 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
861 memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
862} while (0)
863#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
864 size_t flex_array_len_ = (len); \
865 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
866 memcpy((x) + 1, (buf), flex_array_len_); \
867 (x)->ptrname = (void *)((x)+1); \
868} while(0)
869#define FLEX_ALLOC_STR(x, flexname, str) \
870 FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
871#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
872 FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
873static inline char *xstrdup_or_null(const char *str)
875{
876 return str ? xstrdup(str) : NULL;
877}
878static inline size_t xsize_t(off_t len)
880{
881 if (len > (size_t) len)
882 die("Cannot handle files this big");
883 return (size_t)len;
884}
885__attribute__((format (printf, 3, 4)))
887extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
888/* in ctype.c, for kwset users */
890extern const unsigned char tolower_trans_tbl[256];
891/* Sane ctype - no locale, and works with signed chars */
893#undef isascii
894#undef isspace
895#undef isdigit
896#undef isalpha
897#undef isalnum
898#undef isprint
899#undef islower
900#undef isupper
901#undef tolower
902#undef toupper
903#undef iscntrl
904#undef ispunct
905#undef isxdigit
906extern const unsigned char sane_ctype[256];
908#define GIT_SPACE 0x01
909#define GIT_DIGIT 0x02
910#define GIT_ALPHA 0x04
911#define GIT_GLOB_SPECIAL 0x08
912#define GIT_REGEX_SPECIAL 0x10
913#define GIT_PATHSPEC_MAGIC 0x20
914#define GIT_CNTRL 0x40
915#define GIT_PUNCT 0x80
916#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
917#define isascii(x) (((x) & ~0x7f) == 0)
918#define isspace(x) sane_istest(x,GIT_SPACE)
919#define isdigit(x) sane_istest(x,GIT_DIGIT)
920#define isalpha(x) sane_istest(x,GIT_ALPHA)
921#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
922#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
923#define islower(x) sane_iscase(x, 1)
924#define isupper(x) sane_iscase(x, 0)
925#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
926#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
927#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
928#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
929 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
930#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
931#define tolower(x) sane_case((unsigned char)(x), 0x20)
932#define toupper(x) sane_case((unsigned char)(x), 0)
933#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
934static inline int sane_case(int x, int high)
936{
937 if (sane_istest(x, GIT_ALPHA))
938 x = (x & ~0x20) | high;
939 return x;
940}
941static inline int sane_iscase(int x, int is_lower)
943{
944 if (!sane_istest(x, GIT_ALPHA))
945 return 0;
946 if (is_lower)
948 return (x & 0x20) != 0;
949 else
950 return (x & 0x20) == 0;
951}
952static inline int strtoul_ui(char const *s, int base, unsigned int *result)
954{
955 unsigned long ul;
956 char *p;
957 errno = 0;
959 /* negative values would be accepted by strtoul */
960 if (strchr(s, '-'))
961 return -1;
962 ul = strtoul(s, &p, base);
963 if (errno || *p || p == s || (unsigned int) ul != ul)
964 return -1;
965 *result = ul;
966 return 0;
967}
968static inline int strtol_i(char const *s, int base, int *result)
970{
971 long ul;
972 char *p;
973 errno = 0;
975 ul = strtol(s, &p, base);
976 if (errno || *p || p == s || (int) ul != ul)
977 return -1;
978 *result = ul;
979 return 0;
980}
981#ifdef INTERNAL_QSORT
983void git_qsort(void *base, size_t nmemb, size_t size,
984 int(*compar)(const void *, const void *));
985#define qsort git_qsort
986#endif
987#define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
989static inline void sane_qsort(void *base, size_t nmemb, size_t size,
990 int(*compar)(const void *, const void *))
991{
992 if (nmemb > 1)
993 qsort(base, nmemb, size, compar);
994}
995#ifndef HAVE_ISO_QSORT_S
997int git_qsort_s(void *base, size_t nmemb, size_t size,
998 int (*compar)(const void *, const void *, void *), void *ctx);
999#define qsort_s git_qsort_s
1000#endif
1001#define QSORT_S(base, n, compar, ctx) do { \
1003 if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1004 die("BUG: qsort_s() failed"); \
1005} while (0)
1006#ifndef REG_STARTEND
1008#error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1009#endif
1010static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1012 size_t nmatch, regmatch_t pmatch[], int eflags)
1013{
1014 assert(nmatch > 0 && pmatch);
1015 pmatch[0].rm_so = 0;
1016 pmatch[0].rm_eo = size;
1017 return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1018}
1019#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1021# define FORCE_DIR_SET_GID S_ISGID
1022#else
1023# define FORCE_DIR_SET_GID 0
1024#endif
1025#ifdef NO_NSEC
1027#undef USE_NSEC
1028#define ST_CTIME_NSEC(st) 0
1029#define ST_MTIME_NSEC(st) 0
1030#else
1031#ifdef USE_ST_TIMESPEC
1032#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1033#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1034#else
1035#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1036#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1037#endif
1038#endif
1039#ifdef UNRELIABLE_FSTAT
1041#define fstat_is_reliable() 0
1042#else
1043#define fstat_is_reliable() 1
1044#endif
1045#ifndef va_copy
1047/*
1048 * Since an obvious implementation of va_list would be to make it a
1049 * pointer into the stack frame, a simple assignment will work on
1050 * many systems. But let's try to be more portable.
1051 */
1052#ifdef __va_copy
1053#define va_copy(dst, src) __va_copy(dst, src)
1054#else
1055#define va_copy(dst, src) ((dst) = (src))
1056#endif
1057#endif
1058#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
1060#define HAVE_VARIADIC_MACROS 1
1061#endif
1062/*
1064 * Preserves errno, prints a message, but gives no warning for ENOENT.
1065 * Returns 0 on success, which includes trying to unlink an object that does
1066 * not exist.
1067 */
1068int unlink_or_warn(const char *path);
1069 /*
1070 * Tries to unlink file. Returns 0 if unlink succeeded
1071 * or the file already didn't exist. Returns -1 and
1072 * appends a message to err suitable for
1073 * 'error("%s", err->buf)' on error.
1074 */
1075int unlink_or_msg(const char *file, struct strbuf *err);
1076/*
1077 * Preserves errno, prints a message, but gives no warning for ENOENT.
1078 * Returns 0 on success, which includes trying to remove a directory that does
1079 * not exist.
1080 */
1081int rmdir_or_warn(const char *path);
1082/*
1083 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1084 * the supplied file mode.
1085 */
1086int remove_or_warn(unsigned int mode, const char *path);
1087/*
1089 * Call access(2), but warn for any error except "missing file"
1090 * (ENOENT or ENOTDIR).
1091 */
1092#define ACCESS_EACCES_OK (1U << 0)
1093int access_or_warn(const char *path, int mode, unsigned flag);
1094int access_or_die(const char *path, int mode, unsigned flag);
1095/* Warn on an inaccessible file that ought to be accessible */
1097void warn_on_inaccessible(const char *path);
1098#ifdef GMTIME_UNRELIABLE_ERRORS
1100struct tm *git_gmtime(const time_t *);
1101struct tm *git_gmtime_r(const time_t *, struct tm *);
1102#define gmtime git_gmtime
1103#define gmtime_r git_gmtime_r
1104#endif
1105#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1107#define USE_PARENS_AROUND_GETTEXT_N 1
1108#endif
1109#ifndef SHELL_PATH
1111# define SHELL_PATH "/bin/sh"
1112#endif
1113#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1115#define flockfile(fh)
1116#define funlockfile(fh)
1117#define getc_unlocked(fh) getc(fh)
1118#endif
1119extern int cmd_main(int, const char **);
1121#endif