Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6#ifndef FLEX_ARRAY
   7/*
   8 * See if our compiler is known to support flexible array members.
   9 */
  10#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  11# define FLEX_ARRAY /* empty */
  12#elif defined(__GNUC__)
  13# if (__GNUC__ >= 3)
  14#  define FLEX_ARRAY /* empty */
  15# else
  16#  define FLEX_ARRAY 0 /* older GNU extension */
  17# endif
  18#endif
  19
  20/*
  21 * Otherwise, default to safer but a bit wasteful traditional style
  22 */
  23#ifndef FLEX_ARRAY
  24# define FLEX_ARRAY 1
  25#endif
  26#endif
  27
  28#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  29#define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  30
  31#ifdef __GNUC__
  32#define TYPEOF(x) (__typeof__(x))
  33#else
  34#define TYPEOF(x)
  35#endif
  36
  37#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
  38#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  39
  40#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  41
  42/* Approximation of the length of the decimal representation of this type. */
  43#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  44
  45#if defined(__sun__)
  46 /*
  47  * On Solaris, when _XOPEN_EXTENDED is set, its header file
  48  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
  49  * setting to say we are XPG5 or XPG6.  Also on Solaris,
  50  * XPG6 programs must be compiled with a c99 compiler, while
  51  * non XPG6 programs must be compiled with a pre-c99 compiler.
  52  */
  53# if __STDC_VERSION__ - 0 >= 199901L
  54# define _XOPEN_SOURCE 600
  55# else
  56# define _XOPEN_SOURCE 500
  57# endif
  58#elif !defined(__APPLE__) && !defined(__FreeBSD__)  && !defined(__USLC__) && !defined(_M_UNIX) && !defined(sgi)
  59#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  60#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  61#endif
  62#define _ALL_SOURCE 1
  63#define _GNU_SOURCE 1
  64#define _BSD_SOURCE 1
  65#define _NETBSD_SOURCE 1
  66#define _SGI_SOURCE 1
  67
  68#ifdef WIN32 /* Both MinGW and MSVC */
  69#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  70#include <winsock2.h>
  71#include <windows.h>
  72#endif
  73
  74#include <unistd.h>
  75#include <stdio.h>
  76#include <sys/stat.h>
  77#include <fcntl.h>
  78#include <stddef.h>
  79#include <stdlib.h>
  80#include <stdarg.h>
  81#include <string.h>
  82#include <errno.h>
  83#include <limits.h>
  84#include <sys/param.h>
  85#include <sys/types.h>
  86#include <dirent.h>
  87#include <sys/time.h>
  88#include <time.h>
  89#include <signal.h>
  90#include <fnmatch.h>
  91#include <assert.h>
  92#include <regex.h>
  93#include <utime.h>
  94#ifndef __MINGW32__
  95#include <sys/wait.h>
  96#include <sys/poll.h>
  97#include <sys/socket.h>
  98#include <sys/ioctl.h>
  99#include <termios.h>
 100#ifndef NO_SYS_SELECT_H
 101#include <sys/select.h>
 102#endif
 103#include <netinet/in.h>
 104#include <netinet/tcp.h>
 105#include <arpa/inet.h>
 106#include <netdb.h>
 107#include <pwd.h>
 108#include <inttypes.h>
 109#if defined(__CYGWIN__)
 110#undef _XOPEN_SOURCE
 111#include <grp.h>
 112#define _XOPEN_SOURCE 600
 113#include "compat/cygwin.h"
 114#else
 115#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 116#include <grp.h>
 117#define _ALL_SOURCE 1
 118#endif
 119#else   /* __MINGW32__ */
 120/* pull in Windows compatibility stuff */
 121#include "compat/mingw.h"
 122#endif  /* __MINGW32__ */
 123#ifdef _MSC_VER
 124#include "compat/msvc.h"
 125#endif
 126
 127#ifndef NO_LIBGEN_H
 128#include <libgen.h>
 129#else
 130#define basename gitbasename
 131extern char *gitbasename(char *);
 132#endif
 133
 134#ifndef NO_ICONV
 135#include <iconv.h>
 136#endif
 137
 138#ifndef NO_OPENSSL
 139#include <openssl/ssl.h>
 140#include <openssl/err.h>
 141#endif
 142
 143/* On most systems <limits.h> would have given us this, but
 144 * not on some systems (e.g. GNU/Hurd).
 145 */
 146#ifndef PATH_MAX
 147#define PATH_MAX 4096
 148#endif
 149
 150#ifndef PRIuMAX
 151#define PRIuMAX "llu"
 152#endif
 153
 154#ifndef PRIu32
 155#define PRIu32 "u"
 156#endif
 157
 158#ifndef PRIx32
 159#define PRIx32 "x"
 160#endif
 161
 162#ifndef PATH_SEP
 163#define PATH_SEP ':'
 164#endif
 165
 166#ifndef STRIP_EXTENSION
 167#define STRIP_EXTENSION ""
 168#endif
 169
 170#ifndef has_dos_drive_prefix
 171#define has_dos_drive_prefix(path) 0
 172#endif
 173
 174#ifndef is_dir_sep
 175#define is_dir_sep(c) ((c) == '/')
 176#endif
 177
 178#ifdef __GNUC__
 179#define NORETURN __attribute__((__noreturn__))
 180#define NORETURN_PTR __attribute__((__noreturn__))
 181#elif defined(_MSC_VER)
 182#define NORETURN __declspec(noreturn)
 183#define NORETURN_PTR
 184#else
 185#define NORETURN
 186#define NORETURN_PTR
 187#ifndef __attribute__
 188#define __attribute__(x)
 189#endif
 190#endif
 191
 192#include "compat/bswap.h"
 193
 194/* General helper functions */
 195extern void vreportf(const char *prefix, const char *err, va_list params);
 196extern NORETURN void usage(const char *err);
 197extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 198extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 199extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 200extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 201extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 202
 203extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 204
 205extern int prefixcmp(const char *str, const char *prefix);
 206extern int suffixcmp(const char *str, const char *suffix);
 207
 208static inline const char *skip_prefix(const char *str, const char *prefix)
 209{
 210        size_t len = strlen(prefix);
 211        return strncmp(str, prefix, len) ? NULL : str + len;
 212}
 213
 214#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 215
 216#ifndef PROT_READ
 217#define PROT_READ 1
 218#define PROT_WRITE 2
 219#define MAP_PRIVATE 1
 220#define MAP_FAILED ((void*)-1)
 221#endif
 222
 223#define mmap git_mmap
 224#define munmap git_munmap
 225extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 226extern int git_munmap(void *start, size_t length);
 227
 228#else /* NO_MMAP || USE_WIN32_MMAP */
 229
 230#include <sys/mman.h>
 231
 232#endif /* NO_MMAP || USE_WIN32_MMAP */
 233
 234#ifdef NO_MMAP
 235
 236/* This value must be multiple of (pagesize * 2) */
 237#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 238
 239#else /* NO_MMAP */
 240
 241/* This value must be multiple of (pagesize * 2) */
 242#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 243        (sizeof(void*) >= 8 \
 244                ?  1 * 1024 * 1024 * 1024 \
 245                : 32 * 1024 * 1024)
 246
 247#endif /* NO_MMAP */
 248
 249#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 250#define on_disk_bytes(st) ((st).st_size)
 251#else
 252#define on_disk_bytes(st) ((st).st_blocks * 512)
 253#endif
 254
 255#define DEFAULT_PACKED_GIT_LIMIT \
 256        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 257
 258#ifdef NO_PREAD
 259#define pread git_pread
 260extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 261#endif
 262/*
 263 * Forward decl that will remind us if its twin in cache.h changes.
 264 * This function is used in compat/pread.c.  But we can't include
 265 * cache.h there.
 266 */
 267extern ssize_t read_in_full(int fd, void *buf, size_t count);
 268
 269#ifdef NO_SETENV
 270#define setenv gitsetenv
 271extern int gitsetenv(const char *, const char *, int);
 272#endif
 273
 274#ifdef NO_MKDTEMP
 275#define mkdtemp gitmkdtemp
 276extern char *gitmkdtemp(char *);
 277#endif
 278
 279#ifdef NO_MKSTEMPS
 280#define mkstemps gitmkstemps
 281extern int gitmkstemps(char *, int);
 282#endif
 283
 284#ifdef NO_UNSETENV
 285#define unsetenv gitunsetenv
 286extern void gitunsetenv(const char *);
 287#endif
 288
 289#ifdef NO_STRCASESTR
 290#define strcasestr gitstrcasestr
 291extern char *gitstrcasestr(const char *haystack, const char *needle);
 292#endif
 293
 294#ifdef NO_STRLCPY
 295#define strlcpy gitstrlcpy
 296extern size_t gitstrlcpy(char *, const char *, size_t);
 297#endif
 298
 299#ifdef NO_STRTOUMAX
 300#define strtoumax gitstrtoumax
 301extern uintmax_t gitstrtoumax(const char *, char **, int);
 302#endif
 303
 304#ifdef NO_HSTRERROR
 305#define hstrerror githstrerror
 306extern const char *githstrerror(int herror);
 307#endif
 308
 309#ifdef NO_MEMMEM
 310#define memmem gitmemmem
 311void *gitmemmem(const void *haystack, size_t haystacklen,
 312                const void *needle, size_t needlelen);
 313#endif
 314
 315#ifdef FREAD_READS_DIRECTORIES
 316#ifdef fopen
 317#undef fopen
 318#endif
 319#define fopen(a,b) git_fopen(a,b)
 320extern FILE *git_fopen(const char*, const char*);
 321#endif
 322
 323#ifdef SNPRINTF_RETURNS_BOGUS
 324#define snprintf git_snprintf
 325extern int git_snprintf(char *str, size_t maxsize,
 326                        const char *format, ...);
 327#define vsnprintf git_vsnprintf
 328extern int git_vsnprintf(char *str, size_t maxsize,
 329                         const char *format, va_list ap);
 330#endif
 331
 332#ifdef __GLIBC_PREREQ
 333#if __GLIBC_PREREQ(2, 1)
 334#define HAVE_STRCHRNUL
 335#endif
 336#endif
 337
 338#ifndef HAVE_STRCHRNUL
 339#define strchrnul gitstrchrnul
 340static inline char *gitstrchrnul(const char *s, int c)
 341{
 342        while (*s && *s != c)
 343                s++;
 344        return (char *)s;
 345}
 346#endif
 347
 348extern void release_pack_memory(size_t, int);
 349
 350extern char *xstrdup(const char *str);
 351extern void *xmalloc(size_t size);
 352extern void *xmallocz(size_t size);
 353extern void *xmemdupz(const void *data, size_t len);
 354extern char *xstrndup(const char *str, size_t len);
 355extern void *xrealloc(void *ptr, size_t size);
 356extern void *xcalloc(size_t nmemb, size_t size);
 357extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 358extern ssize_t xread(int fd, void *buf, size_t len);
 359extern ssize_t xwrite(int fd, const void *buf, size_t len);
 360extern int xdup(int fd);
 361extern FILE *xfdopen(int fd, const char *mode);
 362extern int xmkstemp(char *template);
 363extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 364extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 365
 366static inline size_t xsize_t(off_t len)
 367{
 368        return (size_t)len;
 369}
 370
 371static inline int has_extension(const char *filename, const char *ext)
 372{
 373        size_t len = strlen(filename);
 374        size_t extlen = strlen(ext);
 375        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 376}
 377
 378/* Sane ctype - no locale, and works with signed chars */
 379#undef isascii
 380#undef isspace
 381#undef isdigit
 382#undef isalpha
 383#undef isalnum
 384#undef tolower
 385#undef toupper
 386extern unsigned char sane_ctype[256];
 387#define GIT_SPACE 0x01
 388#define GIT_DIGIT 0x02
 389#define GIT_ALPHA 0x04
 390#define GIT_GLOB_SPECIAL 0x08
 391#define GIT_REGEX_SPECIAL 0x10
 392#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 393#define isascii(x) (((x) & ~0x7f) == 0)
 394#define isspace(x) sane_istest(x,GIT_SPACE)
 395#define isdigit(x) sane_istest(x,GIT_DIGIT)
 396#define isalpha(x) sane_istest(x,GIT_ALPHA)
 397#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 398#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 399#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 400#define tolower(x) sane_case((unsigned char)(x), 0x20)
 401#define toupper(x) sane_case((unsigned char)(x), 0)
 402
 403static inline int sane_case(int x, int high)
 404{
 405        if (sane_istest(x, GIT_ALPHA))
 406                x = (x & ~0x20) | high;
 407        return x;
 408}
 409
 410static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 411{
 412        unsigned long ul;
 413        char *p;
 414
 415        errno = 0;
 416        ul = strtoul(s, &p, base);
 417        if (errno || *p || p == s || (unsigned int) ul != ul)
 418                return -1;
 419        *result = ul;
 420        return 0;
 421}
 422
 423static inline int strtol_i(char const *s, int base, int *result)
 424{
 425        long ul;
 426        char *p;
 427
 428        errno = 0;
 429        ul = strtol(s, &p, base);
 430        if (errno || *p || p == s || (int) ul != ul)
 431                return -1;
 432        *result = ul;
 433        return 0;
 434}
 435
 436#ifdef INTERNAL_QSORT
 437void git_qsort(void *base, size_t nmemb, size_t size,
 438               int(*compar)(const void *, const void *));
 439#define qsort git_qsort
 440#endif
 441
 442#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 443# define FORCE_DIR_SET_GID S_ISGID
 444#else
 445# define FORCE_DIR_SET_GID 0
 446#endif
 447
 448#ifdef NO_NSEC
 449#undef USE_NSEC
 450#define ST_CTIME_NSEC(st) 0
 451#define ST_MTIME_NSEC(st) 0
 452#else
 453#ifdef USE_ST_TIMESPEC
 454#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 455#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 456#else
 457#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 458#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 459#endif
 460#endif
 461
 462#ifdef UNRELIABLE_FSTAT
 463#define fstat_is_reliable() 0
 464#else
 465#define fstat_is_reliable() 1
 466#endif
 467
 468/*
 469 * Preserves errno, prints a message, but gives no warning for ENOENT.
 470 * Always returns the return value of unlink(2).
 471 */
 472int unlink_or_warn(const char *path);
 473
 474#endif