1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
4 #define _FILE_OFFSET_BITS 64
8 * See if our compiler is known to support flexible array members.
10 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
11 # define FLEX_ARRAY /* empty */
12 #elif defined(__GNUC__)
14 # define FLEX_ARRAY /* empty */
16 # define FLEX_ARRAY 0 /* older GNU extension */
21 * Otherwise, default to safer but a bit wasteful traditional style
28 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
29 #define bitsizeof(x) (CHAR_BIT * sizeof(x))
31 #define maximum_signed_value_of_type(a) \
32 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
34 #define maximum_unsigned_value_of_type(a) \
35 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
38 * Signed integer overflow is undefined in C, so here's a helper macro
39 * to detect if the sum of two integers will overflow.
41 * Requires: a >= 0, typeof(a) equals typeof(b)
43 #define signed_add_overflows(a, b) \
44 ((b) > maximum_signed_value_of_type(a) - (a))
46 #define unsigned_add_overflows(a, b) \
47 ((b) > maximum_unsigned_value_of_type(a) - (a))
50 #define TYPEOF(x) (__typeof__(x))
55 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
56 #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
60 /* Approximation of the length of the decimal representation of this type. */
61 #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
65 * On Solaris, when _XOPEN_EXTENDED is set, its header file
66 * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
67 * setting to say we are XPG5 or XPG6. Also on Solaris,
68 * XPG6 programs must be compiled with a c99 compiler, while
69 * non XPG6 programs must be compiled with a pre-c99 compiler.
71 # if __STDC_VERSION__ - 0 >= 199901L
72 # define _XOPEN_SOURCE 600
74 # define _XOPEN_SOURCE 500
76 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
77 !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__)
78 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
79 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
84 #define _NETBSD_SOURCE 1
87 #ifdef WIN32 /* Both MinGW and MSVC */
88 #define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
103 #include <sys/param.h>
104 #include <sys/types.h>
106 #include <sys/time.h>
114 #ifndef NO_SYS_POLL_H
115 #include <sys/poll.h>
120 #include <sys/wait.h>
121 #include <sys/resource.h>
122 #include <sys/socket.h>
123 #include <sys/ioctl.h>
125 #ifndef NO_SYS_SELECT_H
126 #include <sys/select.h>
128 #include <netinet/in.h>
129 #include <netinet/tcp.h>
130 #include <arpa/inet.h>
134 #ifndef NO_INTTYPES_H
135 #include <inttypes.h>
139 #if defined(__CYGWIN__)
142 #define _XOPEN_SOURCE 600
143 #include "compat/cygwin.h"
145 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
147 #define _ALL_SOURCE 1
149 #else /* __MINGW32__ */
150 /* pull in Windows compatibility stuff */
151 #include "compat/mingw.h"
152 #endif /* __MINGW32__ */
154 #include "compat/msvc.h"
160 #define basename gitbasename
161 extern char *gitbasename(char *);
169 #include <openssl/ssl.h>
170 #include <openssl/err.h>
173 /* On most systems <limits.h> would have given us this, but
174 * not on some systems (e.g. GNU/Hurd).
177 #define PATH_MAX 4096
181 #define PRIuMAX "llu"
203 #ifndef _PATH_DEFPATH
204 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
207 #ifndef STRIP_EXTENSION
208 #define STRIP_EXTENSION ""
211 #ifndef has_dos_drive_prefix
212 #define has_dos_drive_prefix(path) 0
216 #define is_dir_sep(c) ((c) == '/')
219 #ifndef find_last_dir_sep
220 #define find_last_dir_sep(path) strrchr(path, '/')
224 #define NORETURN __attribute__((noreturn))
226 #elif defined(__GNUC__) && !defined(NO_NORETURN)
227 #define NORETURN __attribute__((__noreturn__))
228 #define NORETURN_PTR __attribute__((__noreturn__))
229 #elif defined(_MSC_VER)
230 #define NORETURN __declspec(noreturn)
235 #ifndef __attribute__
236 #define __attribute__(x)
240 #include "compat/bswap.h"
242 /* General helper functions */
243 extern void vreportf(const char *prefix, const char *err, va_list params);
244 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
245 extern NORETURN void usage(const char *err);
246 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
247 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
248 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
249 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
250 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
252 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
253 extern void set_error_routine(void (*routine)(const char *err, va_list params));
255 extern int prefixcmp(const char *str, const char *prefix);
256 extern int suffixcmp(const char *str, const char *suffix);
258 static inline const char *skip_prefix(const char *str, const char *prefix)
260 size_t len = strlen(prefix);
261 return strncmp(str, prefix, len) ? NULL : str + len;
264 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
269 #define MAP_PRIVATE 1
272 #define mmap git_mmap
273 #define munmap git_munmap
274 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
275 extern int git_munmap(void *start, size_t length);
277 #else /* NO_MMAP || USE_WIN32_MMAP */
279 #include <sys/mman.h>
281 #endif /* NO_MMAP || USE_WIN32_MMAP */
285 /* This value must be multiple of (pagesize * 2) */
286 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
290 /* This value must be multiple of (pagesize * 2) */
291 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
292 (sizeof(void*) >= 8 \
293 ? 1 * 1024 * 1024 * 1024 \
299 #define MAP_FAILED ((void *)-1)
302 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
303 #define on_disk_bytes(st) ((st).st_size)
305 #define on_disk_bytes(st) ((st).st_blocks * 512)
308 #define DEFAULT_PACKED_GIT_LIMIT \
309 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
312 #define pread git_pread
313 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
316 * Forward decl that will remind us if its twin in cache.h changes.
317 * This function is used in compat/pread.c. But we can't include
320 extern ssize_t read_in_full(int fd, void *buf, size_t count);
323 #define setenv gitsetenv
324 extern int gitsetenv(const char *, const char *, int);
328 #define mkdtemp gitmkdtemp
329 extern char *gitmkdtemp(char *);
333 #define mkstemps gitmkstemps
334 extern int gitmkstemps(char *, int);
338 #define unsetenv gitunsetenv
339 extern void gitunsetenv(const char *);
343 #define strcasestr gitstrcasestr
344 extern char *gitstrcasestr(const char *haystack, const char *needle);
348 #define strlcpy gitstrlcpy
349 extern size_t gitstrlcpy(char *, const char *, size_t);
353 #define strtoumax gitstrtoumax
354 extern uintmax_t gitstrtoumax(const char *, char **, int);
358 #define strtok_r gitstrtok_r
359 extern char *gitstrtok_r(char *s, const char *delim, char **save_ptr);
363 #define hstrerror githstrerror
364 extern const char *githstrerror(int herror);
368 #define memmem gitmemmem
369 void *gitmemmem(const void *haystack, size_t haystacklen,
370 const void *needle, size_t needlelen);
373 #ifdef FREAD_READS_DIRECTORIES
377 #define fopen(a,b) git_fopen(a,b)
378 extern FILE *git_fopen(const char*, const char*);
381 #ifdef SNPRINTF_RETURNS_BOGUS
382 #define snprintf git_snprintf
383 extern int git_snprintf(char *str, size_t maxsize,
384 const char *format, ...);
385 #define vsnprintf git_vsnprintf
386 extern int git_vsnprintf(char *str, size_t maxsize,
387 const char *format, va_list ap);
390 #ifdef __GLIBC_PREREQ
391 #if __GLIBC_PREREQ(2, 1)
392 #define HAVE_STRCHRNUL
397 #ifndef HAVE_STRCHRNUL
398 #define strchrnul gitstrchrnul
399 static inline char *gitstrchrnul(const char *s, int c)
401 while (*s && *s != c)
408 #define mempcpy gitmempcpy
409 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
411 return (char *)memcpy(dest, src, n) + n;
416 int inet_pton(int af, const char *src, void *dst);
420 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
423 extern void release_pack_memory(size_t, int);
425 typedef void (*try_to_free_t)(size_t);
426 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
428 extern char *xstrdup(const char *str);
429 extern void *xmalloc(size_t size);
430 extern void *xmallocz(size_t size);
431 extern void *xmemdupz(const void *data, size_t len);
432 extern char *xstrndup(const char *str, size_t len);
433 extern void *xrealloc(void *ptr, size_t size);
434 extern void *xcalloc(size_t nmemb, size_t size);
435 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
436 extern ssize_t xread(int fd, void *buf, size_t len);
437 extern ssize_t xwrite(int fd, const void *buf, size_t len);
438 extern int xdup(int fd);
439 extern FILE *xfdopen(int fd, const char *mode);
440 extern int xmkstemp(char *template);
441 extern int xmkstemp_mode(char *template, int mode);
442 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
443 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
445 static inline size_t xsize_t(off_t len)
447 if (len > (size_t) len)
448 die("Cannot handle files this big");
452 static inline int has_extension(const char *filename, const char *ext)
454 size_t len = strlen(filename);
455 size_t extlen = strlen(ext);
456 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
459 /* Sane ctype - no locale, and works with signed chars */
467 extern unsigned char sane_ctype[256];
468 #define GIT_SPACE 0x01
469 #define GIT_DIGIT 0x02
470 #define GIT_ALPHA 0x04
471 #define GIT_GLOB_SPECIAL 0x08
472 #define GIT_REGEX_SPECIAL 0x10
473 #define GIT_PATHSPEC_MAGIC 0x20
474 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
475 #define isascii(x) (((x) & ~0x7f) == 0)
476 #define isspace(x) sane_istest(x,GIT_SPACE)
477 #define isdigit(x) sane_istest(x,GIT_DIGIT)
478 #define isalpha(x) sane_istest(x,GIT_ALPHA)
479 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
480 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
481 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
482 #define tolower(x) sane_case((unsigned char)(x), 0x20)
483 #define toupper(x) sane_case((unsigned char)(x), 0)
484 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
486 static inline int sane_case(int x, int high)
488 if (sane_istest(x, GIT_ALPHA))
489 x = (x & ~0x20) | high;
493 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
499 ul = strtoul(s, &p, base);
500 if (errno || *p || p == s || (unsigned int) ul != ul)
506 static inline int strtol_i(char const *s, int base, int *result)
512 ul = strtol(s, &p, base);
513 if (errno || *p || p == s || (int) ul != ul)
519 #ifdef INTERNAL_QSORT
520 void git_qsort(void *base, size_t nmemb, size_t size,
521 int(*compar)(const void *, const void *));
522 #define qsort git_qsort
525 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
526 # define FORCE_DIR_SET_GID S_ISGID
528 # define FORCE_DIR_SET_GID 0
533 #define ST_CTIME_NSEC(st) 0
534 #define ST_MTIME_NSEC(st) 0
536 #ifdef USE_ST_TIMESPEC
537 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
538 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
540 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
541 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
545 #ifdef UNRELIABLE_FSTAT
546 #define fstat_is_reliable() 0
548 #define fstat_is_reliable() 1
553 * Since an obvious implementation of va_list would be to make it a
554 * pointer into the stack frame, a simple assignment will work on
555 * many systems. But let's try to be more portable.
558 #define va_copy(dst, src) __va_copy(dst, src)
560 #define va_copy(dst, src) ((dst) = (src))
565 * Preserves errno, prints a message, but gives no warning for ENOENT.
566 * Always returns the return value of unlink(2).
568 int unlink_or_warn(const char *path);
570 * Likewise for rmdir(2).
572 int rmdir_or_warn(const char *path);
574 * Calls the correct function out of {unlink,rmdir}_or_warn based on
575 * the supplied file mode.
577 int remove_or_warn(unsigned int mode, const char *path);