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