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