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