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