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[git/git.git] / git-compat-util.h
1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
3
4 #define _FILE_OFFSET_BITS 64
5
6
7 /* 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
22
23 #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
37 /*
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
45
46 /*
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
61 #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
79 #define bitsizeof(x) (CHAR_BIT * sizeof(x))
80
81 #define maximum_signed_value_of_type(a) \
82 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
83
84 #define maximum_unsigned_value_of_type(a) \
85 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
86
87 /*
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
96 #define unsigned_add_overflows(a, b) \
97 ((b) > maximum_unsigned_value_of_type(a) - (a))
98
99 /*
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
107 #ifdef __GNUC__
108 #define TYPEOF(x) (__typeof__(x))
109 #else
110 #define TYPEOF(x)
111 #endif
112
113 #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
116 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
117
118 /* 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
121 #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
148 #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
158 #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
192 #if defined(__CYGWIN__)
193 #include "compat/cygwin.h"
194 #endif
195 #if defined(__MINGW32__)
196 /* pull in Windows compatibility stuff */
197 #include "compat/mingw.h"
198 #elif defined(_MSC_VER)
199 #include "compat/msvc.h"
200 #else
201 #include <sys/utsname.h>
202 #include <sys/wait.h>
203 #include <sys/resource.h>
204 #include <sys/socket.h>
205 #include <sys/ioctl.h>
206 #include <termios.h>
207 #ifndef NO_SYS_SELECT_H
208 #include <sys/select.h>
209 #endif
210 #include <netinet/in.h>
211 #include <netinet/tcp.h>
212 #include <arpa/inet.h>
213 #include <netdb.h>
214 #include <pwd.h>
215 #include <sys/un.h>
216 #ifndef NO_INTTYPES_H
217 #include <inttypes.h>
218 #else
219 #include <stdint.h>
220 #endif
221 #ifdef NO_INTPTR_T
222 /*
223 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
224 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
225 * while on IP16 and IP16L32 it is "int" (resp. "short")
226 * Size needs to match (or exceed) 'sizeof(void *)'.
227 * We can't take "long long" here as not everybody has it.
228 */
229 typedef long intptr_t;
230 typedef unsigned long uintptr_t;
231 #endif
232 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
233 #include <grp.h>
234 #define _ALL_SOURCE 1
235 #endif
236
237 /* used on Mac OS X */
238 #ifdef PRECOMPOSE_UNICODE
239 #include "compat/precompose_utf8.h"
240 #else
241 #define precompose_str(in,i_nfd2nfc)
242 #define precompose_argv(c,v)
243 #define probe_utf8_pathname_composition()
244 #endif
245
246 #ifdef MKDIR_WO_TRAILING_SLASH
247 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
248 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
249 #endif
250
251 #ifdef NO_STRUCT_ITIMERVAL
252 struct itimerval {
253 struct timeval it_interval;
254 struct timeval it_value;
255 };
256 #endif
257
258 #ifdef NO_SETITIMER
259 #define setitimer(which,value,ovalue)
260 #endif
261
262 #ifndef NO_LIBGEN_H
263 #include <libgen.h>
264 #else
265 #define basename gitbasename
266 extern char *gitbasename(char *);
267 #define dirname gitdirname
268 extern char *gitdirname(char *);
269 #endif
270
271 #ifndef NO_ICONV
272 #include <iconv.h>
273 #endif
274
275 #ifndef NO_OPENSSL
276 #ifdef __APPLE__
277 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
278 #include <AvailabilityMacros.h>
279 #undef DEPRECATED_ATTRIBUTE
280 #define DEPRECATED_ATTRIBUTE
281 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
282 #endif
283 #include <openssl/ssl.h>
284 #include <openssl/err.h>
285 #endif
286
287 /* On most systems <netdb.h> would have given us this, but
288 * not on some systems (e.g. z/OS).
289 */
290 #ifndef NI_MAXHOST
291 #define NI_MAXHOST 1025
292 #endif
293
294 #ifndef NI_MAXSERV
295 #define NI_MAXSERV 32
296 #endif
297
298 /* On most systems <limits.h> would have given us this, but
299 * not on some systems (e.g. GNU/Hurd).
300 */
301 #ifndef PATH_MAX
302 #define PATH_MAX 4096
303 #endif
304
305 #ifndef PRIuMAX
306 #define PRIuMAX "llu"
307 #endif
308
309 #ifndef SCNuMAX
310 #define SCNuMAX PRIuMAX
311 #endif
312
313 #ifndef PRIu32
314 #define PRIu32 "u"
315 #endif
316
317 #ifndef PRIx32
318 #define PRIx32 "x"
319 #endif
320
321 #ifndef PRIo32
322 #define PRIo32 "o"
323 #endif
324
325 typedef uintmax_t timestamp_t;
326 #define PRItime PRIuMAX
327 #define parse_timestamp strtoumax
328 #define TIME_MAX UINTMAX_MAX
329
330 #ifndef PATH_SEP
331 #define PATH_SEP ':'
332 #endif
333
334 #ifdef HAVE_PATHS_H
335 #include <paths.h>
336 #endif
337 #ifndef _PATH_DEFPATH
338 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
339 #endif
340
341 #ifndef has_dos_drive_prefix
342 static inline int git_has_dos_drive_prefix(const char *path)
343 {
344 return 0;
345 }
346 #define has_dos_drive_prefix git_has_dos_drive_prefix
347 #endif
348
349 #ifndef skip_dos_drive_prefix
350 static inline int git_skip_dos_drive_prefix(char **path)
351 {
352 return 0;
353 }
354 #define skip_dos_drive_prefix git_skip_dos_drive_prefix
355 #endif
356
357 #ifndef is_dir_sep
358 static inline int git_is_dir_sep(int c)
359 {
360 return c == '/';
361 }
362 #define is_dir_sep git_is_dir_sep
363 #endif
364
365 #ifndef offset_1st_component
366 static inline int git_offset_1st_component(const char *path)
367 {
368 return is_dir_sep(path[0]);
369 }
370 #define offset_1st_component git_offset_1st_component
371 #endif
372
373 #ifndef find_last_dir_sep
374 static inline char *git_find_last_dir_sep(const char *path)
375 {
376 return strrchr(path, '/');
377 }
378 #define find_last_dir_sep git_find_last_dir_sep
379 #endif
380
381 #if defined(__HP_cc) && (__HP_cc >= 61000)
382 #define NORETURN __attribute__((noreturn))
383 #define NORETURN_PTR
384 #elif defined(__GNUC__) && !defined(NO_NORETURN)
385 #define NORETURN __attribute__((__noreturn__))
386 #define NORETURN_PTR __attribute__((__noreturn__))
387 #elif defined(_MSC_VER)
388 #define NORETURN __declspec(noreturn)
389 #define NORETURN_PTR
390 #else
391 #define NORETURN
392 #define NORETURN_PTR
393 #ifndef __GNUC__
394 #ifndef __attribute__
395 #define __attribute__(x)
396 #endif
397 #endif
398 #endif
399
400 /* The sentinel attribute is valid from gcc version 4.0 */
401 #if defined(__GNUC__) && (__GNUC__ >= 4)
402 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
403 #else
404 #define LAST_ARG_MUST_BE_NULL
405 #endif
406
407 #include "compat/bswap.h"
408
409 #include "wildmatch.h"
410
411 struct strbuf;
412
413 /* General helper functions */
414 extern void vreportf(const char *prefix, const char *err, va_list params);
415 extern NORETURN void usage(const char *err);
416 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
417 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
418 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
419 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
420 extern int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
421 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
422 extern void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
423
424 #ifndef NO_OPENSSL
425 #ifdef APPLE_COMMON_CRYPTO
426 #include "compat/apple-common-crypto.h"
427 #else
428 #include <openssl/evp.h>
429 #include <openssl/hmac.h>
430 #endif /* APPLE_COMMON_CRYPTO */
431 #include <openssl/x509v3.h>
432 #endif /* NO_OPENSSL */
433
434 /*
435 * Let callers be aware of the constant return value; this can help
436 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
437 * because some compilers may not support variadic macros. Since we're only
438 * trying to help gcc, anyway, it's OK; other compilers will fall back to
439 * using the function as usual.
440 */
441 #if defined(__GNUC__)
442 static inline int const_error(void)
443 {
444 return -1;
445 }
446 #define error(...) (error(__VA_ARGS__), const_error())
447 #define error_errno(...) (error_errno(__VA_ARGS__), const_error())
448 #endif
449
450 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
451 extern void set_error_routine(void (*routine)(const char *err, va_list params));
452 extern void (*get_error_routine(void))(const char *err, va_list params);
453 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
454 extern void (*get_warn_routine(void))(const char *warn, va_list params);
455 extern void set_die_is_recursing_routine(int (*routine)(void));
456
457 extern int starts_with(const char *str, const char *prefix);
458
459 /*
460 * If the string "str" begins with the string found in "prefix", return 1.
461 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
462 * the string right after the prefix).
463 *
464 * Otherwise, return 0 and leave "out" untouched.
465 *
466 * Examples:
467 *
468 * [extract branch name, fail if not a branch]
469 * if (!skip_prefix(ref, "refs/heads/", &branch)
470 * return -1;
471 *
472 * [skip prefix if present, otherwise use whole string]
473 * skip_prefix(name, "refs/heads/", &name);
474 */
475 static inline int skip_prefix(const char *str, const char *prefix,
476 const char **out)
477 {
478 do {
479 if (!*prefix) {
480 *out = str;
481 return 1;
482 }
483 } while (*str++ == *prefix++);
484 return 0;
485 }
486
487 /*
488 * If the string "str" is the same as the string in "prefix", then the "arg"
489 * parameter is set to the "def" parameter and 1 is returned.
490 * If the string "str" begins with the string found in "prefix" and then a
491 * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
492 * (i.e., to the point in the string right after the prefix and the "=" sign),
493 * and 1 is returned.
494 *
495 * Otherwise, return 0 and leave "arg" untouched.
496 *
497 * When we accept both a "--key" and a "--key=<val>" option, this function
498 * can be used instead of !strcmp(arg, "--key") and then
499 * skip_prefix(arg, "--key=", &arg) to parse such an option.
500 */
501 int skip_to_optional_arg_default(const char *str, const char *prefix,
502 const char **arg, const char *def);
503
504 static inline int skip_to_optional_arg(const char *str, const char *prefix,
505 const char **arg)
506 {
507 return skip_to_optional_arg_default(str, prefix, arg, "");
508 }
509
510 /*
511 * Like skip_prefix, but promises never to read past "len" bytes of the input
512 * buffer, and returns the remaining number of bytes in "out" via "outlen".
513 */
514 static inline int skip_prefix_mem(const char *buf, size_t len,
515 const char *prefix,
516 const char **out, size_t *outlen)
517 {
518 size_t prefix_len = strlen(prefix);
519 if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
520 *out = buf + prefix_len;
521 *outlen = len - prefix_len;
522 return 1;
523 }
524 return 0;
525 }
526
527 /*
528 * If buf ends with suffix, return 1 and subtract the length of the suffix
529 * from *len. Otherwise, return 0 and leave *len untouched.
530 */
531 static inline int strip_suffix_mem(const char *buf, size_t *len,
532 const char *suffix)
533 {
534 size_t suflen = strlen(suffix);
535 if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
536 return 0;
537 *len -= suflen;
538 return 1;
539 }
540
541 /*
542 * If str ends with suffix, return 1 and set *len to the size of the string
543 * without the suffix. Otherwise, return 0 and set *len to the size of the
544 * string.
545 *
546 * Note that we do _not_ NUL-terminate str to the new length.
547 */
548 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
549 {
550 *len = strlen(str);
551 return strip_suffix_mem(str, len, suffix);
552 }
553
554 static inline int ends_with(const char *str, const char *suffix)
555 {
556 size_t len;
557 return strip_suffix(str, suffix, &len);
558 }
559
560 #define SWAP(a, b) do { \
561 void *_swap_a_ptr = &(a); \
562 void *_swap_b_ptr = &(b); \
563 unsigned char _swap_buffer[sizeof(a)]; \
564 memcpy(_swap_buffer, _swap_a_ptr, sizeof(a)); \
565 memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) + \
566 BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b))); \
567 memcpy(_swap_b_ptr, _swap_buffer, sizeof(a)); \
568 } while (0)
569
570 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
571
572 #ifndef PROT_READ
573 #define PROT_READ 1
574 #define PROT_WRITE 2
575 #define MAP_PRIVATE 1
576 #endif
577
578 #define mmap git_mmap
579 #define munmap git_munmap
580 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
581 extern int git_munmap(void *start, size_t length);
582
583 #else /* NO_MMAP || USE_WIN32_MMAP */
584
585 #include <sys/mman.h>
586
587 #endif /* NO_MMAP || USE_WIN32_MMAP */
588
589 #ifdef NO_MMAP
590
591 /* This value must be multiple of (pagesize * 2) */
592 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
593
594 #else /* NO_MMAP */
595
596 /* This value must be multiple of (pagesize * 2) */
597 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
598 (sizeof(void*) >= 8 \
599 ? 1 * 1024 * 1024 * 1024 \
600 : 32 * 1024 * 1024)
601
602 #endif /* NO_MMAP */
603
604 #ifndef MAP_FAILED
605 #define MAP_FAILED ((void *)-1)
606 #endif
607
608 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
609 #define on_disk_bytes(st) ((st).st_size)
610 #else
611 #define on_disk_bytes(st) ((st).st_blocks * 512)
612 #endif
613
614 #ifdef NEEDS_MODE_TRANSLATION
615 #undef S_IFMT
616 #undef S_IFREG
617 #undef S_IFDIR
618 #undef S_IFLNK
619 #undef S_IFBLK
620 #undef S_IFCHR
621 #undef S_IFIFO
622 #undef S_IFSOCK
623 #define S_IFMT 0170000
624 #define S_IFREG 0100000
625 #define S_IFDIR 0040000
626 #define S_IFLNK 0120000
627 #define S_IFBLK 0060000
628 #define S_IFCHR 0020000
629 #define S_IFIFO 0010000
630 #define S_IFSOCK 0140000
631 #ifdef stat
632 #undef stat
633 #endif
634 #define stat(path, buf) git_stat(path, buf)
635 extern int git_stat(const char *, struct stat *);
636 #ifdef fstat
637 #undef fstat
638 #endif
639 #define fstat(fd, buf) git_fstat(fd, buf)
640 extern int git_fstat(int, struct stat *);
641 #ifdef lstat
642 #undef lstat
643 #endif
644 #define lstat(path, buf) git_lstat(path, buf)
645 extern int git_lstat(const char *, struct stat *);
646 #endif
647
648 #define DEFAULT_PACKED_GIT_LIMIT \
649 ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
650
651 #ifdef NO_PREAD
652 #define pread git_pread
653 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
654 #endif
655 /*
656 * Forward decl that will remind us if its twin in cache.h changes.
657 * This function is used in compat/pread.c. But we can't include
658 * cache.h there.
659 */
660 extern ssize_t read_in_full(int fd, void *buf, size_t count);
661
662 #ifdef NO_SETENV
663 #define setenv gitsetenv
664 extern int gitsetenv(const char *, const char *, int);
665 #endif
666
667 #ifdef NO_MKDTEMP
668 #define mkdtemp gitmkdtemp
669 extern char *gitmkdtemp(char *);
670 #endif
671
672 #ifdef NO_UNSETENV
673 #define unsetenv gitunsetenv
674 extern void gitunsetenv(const char *);
675 #endif
676
677 #ifdef NO_STRCASESTR
678 #define strcasestr gitstrcasestr
679 extern char *gitstrcasestr(const char *haystack, const char *needle);
680 #endif
681
682 #ifdef NO_STRLCPY
683 #define strlcpy gitstrlcpy
684 extern size_t gitstrlcpy(char *, const char *, size_t);
685 #endif
686
687 #ifdef NO_STRTOUMAX
688 #define strtoumax gitstrtoumax
689 extern uintmax_t gitstrtoumax(const char *, char **, int);
690 #define strtoimax gitstrtoimax
691 extern intmax_t gitstrtoimax(const char *, char **, int);
692 #endif
693
694 #ifdef NO_HSTRERROR
695 #define hstrerror githstrerror
696 extern const char *githstrerror(int herror);
697 #endif
698
699 #ifdef NO_MEMMEM
700 #define memmem gitmemmem
701 void *gitmemmem(const void *haystack, size_t haystacklen,
702 const void *needle, size_t needlelen);
703 #endif
704
705 #ifdef OVERRIDE_STRDUP
706 #ifdef strdup
707 #undef strdup
708 #endif
709 #define strdup gitstrdup
710 char *gitstrdup(const char *s);
711 #endif
712
713 #ifdef NO_GETPAGESIZE
714 #define getpagesize() sysconf(_SC_PAGESIZE)
715 #endif
716
717 #ifndef O_CLOEXEC
718 #define O_CLOEXEC 0
719 #endif
720
721 #ifdef FREAD_READS_DIRECTORIES
722 # if !defined(SUPPRESS_FOPEN_REDEFINITION)
723 # ifdef fopen
724 # undef fopen
725 # endif
726 # define fopen(a,b) git_fopen(a,b)
727 # endif
728 extern FILE *git_fopen(const char*, const char*);
729 #endif
730
731 #ifdef SNPRINTF_RETURNS_BOGUS
732 #ifdef snprintf
733 #undef snprintf
734 #endif
735 #define snprintf git_snprintf
736 extern int git_snprintf(char *str, size_t maxsize,
737 const char *format, ...);
738 #ifdef vsnprintf
739 #undef vsnprintf
740 #endif
741 #define vsnprintf git_vsnprintf
742 extern int git_vsnprintf(char *str, size_t maxsize,
743 const char *format, va_list ap);
744 #endif
745
746 #ifdef __GLIBC_PREREQ
747 #if __GLIBC_PREREQ(2, 1)
748 #define HAVE_STRCHRNUL
749 #endif
750 #endif
751
752 #ifndef HAVE_STRCHRNUL
753 #define strchrnul gitstrchrnul
754 static inline char *gitstrchrnul(const char *s, int c)
755 {
756 while (*s && *s != c)
757 s++;
758 return (char *)s;
759 }
760 #endif
761
762 #ifdef NO_INET_PTON
763 int inet_pton(int af, const char *src, void *dst);
764 #endif
765
766 #ifdef NO_INET_NTOP
767 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
768 #endif
769
770 #ifdef NO_PTHREADS
771 #define atexit git_atexit
772 extern int git_atexit(void (*handler)(void));
773 #endif
774
775 typedef void (*try_to_free_t)(size_t);
776 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
777
778 static inline size_t st_add(size_t a, size_t b)
779 {
780 if (unsigned_add_overflows(a, b))
781 die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
782 (uintmax_t)a, (uintmax_t)b);
783 return a + b;
784 }
785 #define st_add3(a,b,c) st_add(st_add((a),(b)),(c))
786 #define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
787
788 static inline size_t st_mult(size_t a, size_t b)
789 {
790 if (unsigned_mult_overflows(a, b))
791 die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
792 (uintmax_t)a, (uintmax_t)b);
793 return a * b;
794 }
795
796 static inline size_t st_sub(size_t a, size_t b)
797 {
798 if (a < b)
799 die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
800 (uintmax_t)a, (uintmax_t)b);
801 return a - b;
802 }
803
804 #ifdef HAVE_ALLOCA_H
805 # include <alloca.h>
806 # define xalloca(size) (alloca(size))
807 # define xalloca_free(p) do {} while (0)
808 #else
809 # define xalloca(size) (xmalloc(size))
810 # define xalloca_free(p) (free(p))
811 #endif
812 extern char *xstrdup(const char *str);
813 extern void *xmalloc(size_t size);
814 extern void *xmallocz(size_t size);
815 extern void *xmallocz_gently(size_t size);
816 extern void *xmemdupz(const void *data, size_t len);
817 extern char *xstrndup(const char *str, size_t len);
818 extern void *xrealloc(void *ptr, size_t size);
819 extern void *xcalloc(size_t nmemb, size_t size);
820 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
821 extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
822 extern int xopen(const char *path, int flags, ...);
823 extern ssize_t xread(int fd, void *buf, size_t len);
824 extern ssize_t xwrite(int fd, const void *buf, size_t len);
825 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
826 extern int xdup(int fd);
827 extern FILE *xfopen(const char *path, const char *mode);
828 extern FILE *xfdopen(int fd, const char *mode);
829 extern int xmkstemp(char *template);
830 extern int xmkstemp_mode(char *template, int mode);
831 extern char *xgetcwd(void);
832 extern FILE *fopen_for_writing(const char *path);
833 extern FILE *fopen_or_warn(const char *path, const char *mode);
834
835 /*
836 * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
837 * that ptr is used twice, so don't pass e.g. ptr++.
838 */
839 #define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
840
841 #define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
842 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
843
844 #define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
845 BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
846 static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
847 {
848 if (n)
849 memcpy(dst, src, st_mult(size, n));
850 }
851
852 #define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
853 BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
854 static inline void move_array(void *dst, const void *src, size_t n, size_t size)
855 {
856 if (n)
857 memmove(dst, src, st_mult(size, n));
858 }
859
860 /*
861 * These functions help you allocate structs with flex arrays, and copy
862 * the data directly into the array. For example, if you had:
863 *
864 * struct foo {
865 * int bar;
866 * char name[FLEX_ARRAY];
867 * };
868 *
869 * you can do:
870 *
871 * struct foo *f;
872 * FLEX_ALLOC_MEM(f, name, src, len);
873 *
874 * to allocate a "foo" with the contents of "src" in the "name" field.
875 * The resulting struct is automatically zero'd, and the flex-array field
876 * is NUL-terminated (whether the incoming src buffer was or not).
877 *
878 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
879 * but do want to store a pointer to some extra data in the same allocated
880 * block. For example, if you have:
881 *
882 * struct foo {
883 * char *name;
884 * int bar;
885 * };
886 *
887 * you can do:
888 *
889 * struct foo *f;
890 * FLEXPTR_ALLOC_STR(f, name, src);
891 *
892 * and "name" will point to a block of memory after the struct, which will be
893 * freed along with the struct (but the pointer can be repointed anywhere).
894 *
895 * The *_STR variants accept a string parameter rather than a ptr/len
896 * combination.
897 *
898 * Note that these macros will evaluate the first parameter multiple
899 * times, and it must be assignable as an lvalue.
900 */
901 #define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
902 size_t flex_array_len_ = (len); \
903 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
904 memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
905 } while (0)
906 #define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
907 size_t flex_array_len_ = (len); \
908 (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
909 memcpy((x) + 1, (buf), flex_array_len_); \
910 (x)->ptrname = (void *)((x)+1); \
911 } while(0)
912 #define FLEX_ALLOC_STR(x, flexname, str) \
913 FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
914 #define FLEXPTR_ALLOC_STR(x, ptrname, str) \
915 FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
916
917 static inline char *xstrdup_or_null(const char *str)
918 {
919 return str ? xstrdup(str) : NULL;
920 }
921
922 static inline size_t xsize_t(off_t len)
923 {
924 size_t size = (size_t) len;
925
926 if (len != (off_t) size)
927 die("Cannot handle files this big");
928 return size;
929 }
930
931 __attribute__((format (printf, 3, 4)))
932 extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
933
934 #ifndef HOST_NAME_MAX
935 #define HOST_NAME_MAX 256
936 #endif
937
938 extern int xgethostname(char *buf, size_t len);
939
940 /* in ctype.c, for kwset users */
941 extern const unsigned char tolower_trans_tbl[256];
942
943 /* Sane ctype - no locale, and works with signed chars */
944 #undef isascii
945 #undef isspace
946 #undef isdigit
947 #undef isalpha
948 #undef isalnum
949 #undef isprint
950 #undef islower
951 #undef isupper
952 #undef tolower
953 #undef toupper
954 #undef iscntrl
955 #undef ispunct
956 #undef isxdigit
957
958 extern const unsigned char sane_ctype[256];
959 #define GIT_SPACE 0x01
960 #define GIT_DIGIT 0x02
961 #define GIT_ALPHA 0x04
962 #define GIT_GLOB_SPECIAL 0x08
963 #define GIT_REGEX_SPECIAL 0x10
964 #define GIT_PATHSPEC_MAGIC 0x20
965 #define GIT_CNTRL 0x40
966 #define GIT_PUNCT 0x80
967 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
968 #define isascii(x) (((x) & ~0x7f) == 0)
969 #define isspace(x) sane_istest(x,GIT_SPACE)
970 #define isdigit(x) sane_istest(x,GIT_DIGIT)
971 #define isalpha(x) sane_istest(x,GIT_ALPHA)
972 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
973 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
974 #define islower(x) sane_iscase(x, 1)
975 #define isupper(x) sane_iscase(x, 0)
976 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
977 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
978 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
979 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
980 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
981 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
982 #define tolower(x) sane_case((unsigned char)(x), 0x20)
983 #define toupper(x) sane_case((unsigned char)(x), 0)
984 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
985
986 static inline int sane_case(int x, int high)
987 {
988 if (sane_istest(x, GIT_ALPHA))
989 x = (x & ~0x20) | high;
990 return x;
991 }
992
993 static inline int sane_iscase(int x, int is_lower)
994 {
995 if (!sane_istest(x, GIT_ALPHA))
996 return 0;
997
998 if (is_lower)
999 return (x & 0x20) != 0;
1000 else
1001 return (x & 0x20) == 0;
1002 }
1003
1004 /*
1005 * Like skip_prefix, but compare case-insensitively. Note that the comparison
1006 * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1007 * locale-specific conversions).
1008 */
1009 static inline int skip_iprefix(const char *str, const char *prefix,
1010 const char **out)
1011 {
1012 do {
1013 if (!*prefix) {
1014 *out = str;
1015 return 1;
1016 }
1017 } while (tolower(*str++) == tolower(*prefix++));
1018 return 0;
1019 }
1020
1021 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
1022 {
1023 unsigned long ul;
1024 char *p;
1025
1026 errno = 0;
1027 /* negative values would be accepted by strtoul */
1028 if (strchr(s, '-'))
1029 return -1;
1030 ul = strtoul(s, &p, base);
1031 if (errno || *p || p == s || (unsigned int) ul != ul)
1032 return -1;
1033 *result = ul;
1034 return 0;
1035 }
1036
1037 static inline int strtol_i(char const *s, int base, int *result)
1038 {
1039 long ul;
1040 char *p;
1041
1042 errno = 0;
1043 ul = strtol(s, &p, base);
1044 if (errno || *p || p == s || (int) ul != ul)
1045 return -1;
1046 *result = ul;
1047 return 0;
1048 }
1049
1050 #ifdef INTERNAL_QSORT
1051 void git_qsort(void *base, size_t nmemb, size_t size,
1052 int(*compar)(const void *, const void *));
1053 #define qsort git_qsort
1054 #endif
1055
1056 #define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1057 static inline void sane_qsort(void *base, size_t nmemb, size_t size,
1058 int(*compar)(const void *, const void *))
1059 {
1060 if (nmemb > 1)
1061 qsort(base, nmemb, size, compar);
1062 }
1063
1064 #ifndef HAVE_ISO_QSORT_S
1065 int git_qsort_s(void *base, size_t nmemb, size_t size,
1066 int (*compar)(const void *, const void *, void *), void *ctx);
1067 #define qsort_s git_qsort_s
1068 #endif
1069
1070 #define QSORT_S(base, n, compar, ctx) do { \
1071 if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1072 die("BUG: qsort_s() failed"); \
1073 } while (0)
1074
1075 #ifndef REG_STARTEND
1076 #error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1077 #endif
1078
1079 static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1080 size_t nmatch, regmatch_t pmatch[], int eflags)
1081 {
1082 assert(nmatch > 0 && pmatch);
1083 pmatch[0].rm_so = 0;
1084 pmatch[0].rm_eo = size;
1085 return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1086 }
1087
1088 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1089 # define FORCE_DIR_SET_GID S_ISGID
1090 #else
1091 # define FORCE_DIR_SET_GID 0
1092 #endif
1093
1094 #ifdef NO_NSEC
1095 #undef USE_NSEC
1096 #define ST_CTIME_NSEC(st) 0
1097 #define ST_MTIME_NSEC(st) 0
1098 #else
1099 #ifdef USE_ST_TIMESPEC
1100 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1101 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1102 #else
1103 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1104 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1105 #endif
1106 #endif
1107
1108 #ifdef UNRELIABLE_FSTAT
1109 #define fstat_is_reliable() 0
1110 #else
1111 #define fstat_is_reliable() 1
1112 #endif
1113
1114 #ifndef va_copy
1115 /*
1116 * Since an obvious implementation of va_list would be to make it a
1117 * pointer into the stack frame, a simple assignment will work on
1118 * many systems. But let's try to be more portable.
1119 */
1120 #ifdef __va_copy
1121 #define va_copy(dst, src) __va_copy(dst, src)
1122 #else
1123 #define va_copy(dst, src) ((dst) = (src))
1124 #endif
1125 #endif
1126
1127 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
1128 #define HAVE_VARIADIC_MACROS 1
1129 #endif
1130
1131 #ifdef HAVE_VARIADIC_MACROS
1132 __attribute__((format (printf, 3, 4))) NORETURN
1133 void BUG_fl(const char *file, int line, const char *fmt, ...);
1134 #define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1135 #else
1136 __attribute__((format (printf, 1, 2))) NORETURN
1137 void BUG(const char *fmt, ...);
1138 #endif
1139
1140 /*
1141 * Preserves errno, prints a message, but gives no warning for ENOENT.
1142 * Returns 0 on success, which includes trying to unlink an object that does
1143 * not exist.
1144 */
1145 int unlink_or_warn(const char *path);
1146 /*
1147 * Tries to unlink file. Returns 0 if unlink succeeded
1148 * or the file already didn't exist. Returns -1 and
1149 * appends a message to err suitable for
1150 * 'error("%s", err->buf)' on error.
1151 */
1152 int unlink_or_msg(const char *file, struct strbuf *err);
1153 /*
1154 * Preserves errno, prints a message, but gives no warning for ENOENT.
1155 * Returns 0 on success, which includes trying to remove a directory that does
1156 * not exist.
1157 */
1158 int rmdir_or_warn(const char *path);
1159 /*
1160 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1161 * the supplied file mode.
1162 */
1163 int remove_or_warn(unsigned int mode, const char *path);
1164
1165 /*
1166 * Call access(2), but warn for any error except "missing file"
1167 * (ENOENT or ENOTDIR).
1168 */
1169 #define ACCESS_EACCES_OK (1U << 0)
1170 int access_or_warn(const char *path, int mode, unsigned flag);
1171 int access_or_die(const char *path, int mode, unsigned flag);
1172
1173 /* Warn on an inaccessible file if errno indicates this is an error */
1174 int warn_on_fopen_errors(const char *path);
1175
1176 #ifdef GMTIME_UNRELIABLE_ERRORS
1177 struct tm *git_gmtime(const time_t *);
1178 struct tm *git_gmtime_r(const time_t *, struct tm *);
1179 #define gmtime git_gmtime
1180 #define gmtime_r git_gmtime_r
1181 #endif
1182
1183 #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1184 #define USE_PARENS_AROUND_GETTEXT_N 1
1185 #endif
1186
1187 #ifndef SHELL_PATH
1188 # define SHELL_PATH "/bin/sh"
1189 #endif
1190
1191 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1192 #define flockfile(fh)
1193 #define funlockfile(fh)
1194 #define getc_unlocked(fh) getc(fh)
1195 #endif
1196
1197 /*
1198 * Our code often opens a path to an optional file, to work on its
1199 * contents when we can successfully open it. We can ignore a failure
1200 * to open if such an optional file does not exist, but we do want to
1201 * report a failure in opening for other reasons (e.g. we got an I/O
1202 * error, or the file is there, but we lack the permission to open).
1203 *
1204 * Call this function after seeing an error from open() or fopen() to
1205 * see if the errno indicates a missing file that we can safely ignore.
1206 */
1207 static inline int is_missing_file_error(int errno_)
1208 {
1209 return (errno_ == ENOENT || errno_ == ENOTDIR);
1210 }
1211
1212 extern int cmd_main(int, const char **);
1213
1214 /*
1215 * You can mark a stack variable with UNLEAK(var) to avoid it being
1216 * reported as a leak by tools like LSAN or valgrind. The argument
1217 * should generally be the variable itself (not its address and not what
1218 * it points to). It's safe to use this on pointers which may already
1219 * have been freed, or on pointers which may still be in use.
1220 *
1221 * Use this _only_ for a variable that leaks by going out of scope at
1222 * program exit (so only from cmd_* functions or their direct helpers).
1223 * Normal functions, especially those which may be called multiple
1224 * times, should actually free their memory. This is only meant as
1225 * an annotation, and does nothing in non-leak-checking builds.
1226 */
1227 #ifdef SUPPRESS_ANNOTATED_LEAKS
1228 extern void unleak_memory(const void *ptr, size_t len);
1229 #define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1230 #else
1231 #define UNLEAK(var) do {} while (0)
1232 #endif
1233
1234 #endif