Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit submodule deinit: require '--all' instead of '.' for all submodules (f6a5279)
   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6
   7/* Derived from Linux "Features Test Macro" header
   8 * Convenience macros to test the versions of gcc (or
   9 * a compatible compiler).
  10 * Use them like this:
  11 *  #if GIT_GNUC_PREREQ (2,8)
  12 *   ... code requiring gcc 2.8 or later ...
  13 *  #endif
  14*/
  15#if defined(__GNUC__) && defined(__GNUC_MINOR__)
  16# define GIT_GNUC_PREREQ(maj, min) \
  17        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  18#else
  19 #define GIT_GNUC_PREREQ(maj, min) 0
  20#endif
  21
  22
  23#ifndef FLEX_ARRAY
  24/*
  25 * See if our compiler is known to support flexible array members.
  26 */
  27#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  28# define FLEX_ARRAY /* empty */
  29#elif defined(__GNUC__)
  30# if (__GNUC__ >= 3)
  31#  define FLEX_ARRAY /* empty */
  32# else
  33#  define FLEX_ARRAY 0 /* older GNU extension */
  34# endif
  35#endif
  36
  37/*
  38 * Otherwise, default to safer but a bit wasteful traditional style
  39 */
  40#ifndef FLEX_ARRAY
  41# define FLEX_ARRAY 1
  42#endif
  43#endif
  44
  45
  46/*
  47 * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
  48 * @cond: the compile-time condition which must be true.
  49 *
  50 * Your compile will fail if the condition isn't true, or can't be evaluated
  51 * by the compiler.  This can be used in an expression: its value is "0".
  52 *
  53 * Example:
  54 *      #define foo_to_char(foo)                                        \
  55 *               ((char *)(foo)                                         \
  56 *                + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
  57 */
  58#define BUILD_ASSERT_OR_ZERO(cond) \
  59        (sizeof(char [1 - 2*!(cond)]) - 1)
  60
  61#if GIT_GNUC_PREREQ(3, 1)
  62 /* &arr[0] degrades to a pointer: a different type from an array */
  63# define BARF_UNLESS_AN_ARRAY(arr)                                              \
  64        BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
  65                                                           __typeof__(&(arr)[0])))
  66#else
  67# define BARF_UNLESS_AN_ARRAY(arr) 0
  68#endif
  69/*
  70 * ARRAY_SIZE - get the number of elements in a visible array
  71 *  <at> x: the array whose size you want.
  72 *
  73 * This does not work on pointers, or arrays declared as [], or
  74 * function parameters.  With correct compiler support, such usage
  75 * will cause a build error (see the build_assert_or_zero macro).
  76 */
  77#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
  78
  79#define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  80
  81#define maximum_signed_value_of_type(a) \
  82    (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  83
  84#define maximum_unsigned_value_of_type(a) \
  85    (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  86
  87/*
  88 * Signed integer overflow is undefined in C, so here's a helper macro
  89 * to detect if the sum of two integers will overflow.
  90 *
  91 * Requires: a >= 0, typeof(a) equals typeof(b)
  92 */
  93#define signed_add_overflows(a, b) \
  94    ((b) > maximum_signed_value_of_type(a) - (a))
  95
  96#define unsigned_add_overflows(a, b) \
  97    ((b) > maximum_unsigned_value_of_type(a) - (a))
  98
  99/*
 100 * Returns true if the multiplication of "a" and "b" will
 101 * overflow. The types of "a" and "b" must match and must be unsigned.
 102 * Note that this macro evaluates "a" twice!
 103 */
 104#define unsigned_mult_overflows(a, b) \
 105    ((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
 106
 107#ifdef __GNUC__
 108#define TYPEOF(x) (__typeof__(x))
 109#else
 110#define TYPEOF(x)
 111#endif
 112
 113#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
 114#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 115
 116#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 117
 118/* Approximation of the length of the decimal representation of this type. */
 119#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
 120
 121#if defined(__sun__)
 122 /*
 123  * On Solaris, when _XOPEN_EXTENDED is set, its header file
 124  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
 125  * setting to say we are XPG5 or XPG6.  Also on Solaris,
 126  * XPG6 programs must be compiled with a c99 compiler, while
 127  * non XPG6 programs must be compiled with a pre-c99 compiler.
 128  */
 129# if __STDC_VERSION__ - 0 >= 199901L
 130# define _XOPEN_SOURCE 600
 131# else
 132# define _XOPEN_SOURCE 500
 133# endif
 134#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
 135      !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
 136      !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
 137      !defined(__CYGWIN__)
 138#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 139#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 140#endif
 141#define _ALL_SOURCE 1
 142#define _GNU_SOURCE 1
 143#define _BSD_SOURCE 1
 144#define _DEFAULT_SOURCE 1
 145#define _NETBSD_SOURCE 1
 146#define _SGI_SOURCE 1
 147
 148#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 149# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 150#  define _WIN32_WINNT 0x0502
 151# endif
 152#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 153#include <winsock2.h>
 154#include <windows.h>
 155#define GIT_WINDOWS_NATIVE
 156#endif
 157
 158#include <unistd.h>
 159#include <stdio.h>
 160#include <sys/stat.h>
 161#include <fcntl.h>
 162#include <stddef.h>
 163#include <stdlib.h>
 164#include <stdarg.h>
 165#include <string.h>
 166#ifdef HAVE_STRINGS_H
 167#include <strings.h> /* for strcasecmp() */
 168#endif
 169#include <errno.h>
 170#include <limits.h>
 171#ifdef NEEDS_SYS_PARAM_H
 172#include <sys/param.h>
 173#endif
 174#include <sys/types.h>
 175#include <dirent.h>
 176#include <sys/time.h>
 177#include <time.h>
 178#include <signal.h>
 179#include <assert.h>
 180#include <regex.h>
 181#include <utime.h>
 182#include <syslog.h>
 183#ifndef NO_SYS_POLL_H
 184#include <sys/poll.h>
 185#else
 186#include <poll.h>
 187#endif
 188#ifdef HAVE_BSD_SYSCTL
 189#include <sys/sysctl.h>
 190#endif
 191
 192#if defined(__MINGW32__)
 193/* pull in Windows compatibility stuff */
 194#include "compat/mingw.h"
 195#elif defined(_MSC_VER)
 196#include "compat/msvc.h"
 197#else
 198#include <sys/utsname.h>
 199#include <sys/wait.h>
 200#include <sys/resource.h>
 201#include <sys/socket.h>
 202#include <sys/ioctl.h>
 203#include <termios.h>
 204#ifndef NO_SYS_SELECT_H
 205#include <sys/select.h>
 206#endif
 207#include <netinet/in.h>
 208#include <netinet/tcp.h>
 209#include <arpa/inet.h>
 210#include <netdb.h>
 211#include <pwd.h>
 212#include <sys/un.h>
 213#ifndef NO_INTTYPES_H
 214#include <inttypes.h>
 215#else
 216#include <stdint.h>
 217#endif
 218#ifdef NO_INTPTR_T
 219/*
 220 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 221 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 222 * while on IP16 and IP16L32 it is "int" (resp. "short")
 223 * Size needs to match (or exceed) 'sizeof(void *)'.
 224 * We can't take "long long" here as not everybody has it.
 225 */
 226typedef long intptr_t;
 227typedef unsigned long uintptr_t;
 228#endif
 229#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 230#include <grp.h>
 231#define _ALL_SOURCE 1
 232#endif
 233
 234/* used on Mac OS X */
 235#ifdef PRECOMPOSE_UNICODE
 236#include "compat/precompose_utf8.h"
 237#else
 238#define precompose_str(in,i_nfd2nfc)
 239#define precompose_argv(c,v)
 240#define probe_utf8_pathname_composition()
 241#endif
 242
 243#ifdef MKDIR_WO_TRAILING_SLASH
 244#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 245extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 246#endif
 247
 248#ifdef NO_STRUCT_ITIMERVAL
 249struct itimerval {
 250        struct timeval it_interval;
 251        struct timeval it_value;
 252};
 253#endif
 254
 255#ifdef NO_SETITIMER
 256#define setitimer(which,value,ovalue)
 257#endif
 258
 259#ifndef NO_LIBGEN_H
 260#include <libgen.h>
 261#else
 262#define basename gitbasename
 263extern char *gitbasename(char *);
 264#define dirname gitdirname
 265extern char *gitdirname(char *);
 266#endif
 267
 268#ifndef NO_ICONV
 269#include <iconv.h>
 270#endif
 271
 272#ifndef NO_OPENSSL
 273#ifdef __APPLE__
 274#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 275#include <AvailabilityMacros.h>
 276#undef DEPRECATED_ATTRIBUTE
 277#define DEPRECATED_ATTRIBUTE
 278#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 279#endif
 280#include <openssl/ssl.h>
 281#include <openssl/err.h>
 282#ifdef NO_HMAC_CTX_CLEANUP
 283#define HMAC_CTX_cleanup HMAC_cleanup
 284#endif
 285#endif
 286
 287/* On most systems <netdb.h> would have given us this, but
 288 * not on some systems (e.g. z/OS).
 289 */
 290#ifndef NI_MAXHOST
 291#define NI_MAXHOST 1025
 292#endif
 293
 294#ifndef NI_MAXSERV
 295#define NI_MAXSERV 32
 296#endif
 297
 298/* On most systems <limits.h> would have given us this, but
 299 * not on some systems (e.g. GNU/Hurd).
 300 */
 301#ifndef PATH_MAX
 302#define PATH_MAX 4096
 303#endif
 304
 305#ifndef PRIuMAX
 306#define PRIuMAX "llu"
 307#endif
 308
 309#ifndef SCNuMAX
 310#define SCNuMAX PRIuMAX
 311#endif
 312
 313#ifndef PRIu32
 314#define PRIu32 "u"
 315#endif
 316
 317#ifndef PRIx32
 318#define PRIx32 "x"
 319#endif
 320
 321#ifndef PRIo32
 322#define PRIo32 "o"
 323#endif
 324
 325#ifndef PATH_SEP
 326#define PATH_SEP ':'
 327#endif
 328
 329#ifdef HAVE_PATHS_H
 330#include <paths.h>
 331#endif
 332#ifndef _PATH_DEFPATH
 333#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 334#endif
 335
 336#ifndef has_dos_drive_prefix
 337static inline int git_has_dos_drive_prefix(const char *path)
 338{
 339        return 0;
 340}
 341#define has_dos_drive_prefix git_has_dos_drive_prefix
 342#endif
 343
 344#ifndef skip_dos_drive_prefix
 345static inline int git_skip_dos_drive_prefix(char **path)
 346{
 347        return 0;
 348}
 349#define skip_dos_drive_prefix git_skip_dos_drive_prefix
 350#endif
 351
 352#ifndef is_dir_sep
 353static inline int git_is_dir_sep(int c)
 354{
 355        return c == '/';
 356}
 357#define is_dir_sep git_is_dir_sep
 358#endif
 359
 360#ifndef offset_1st_component
 361static inline int git_offset_1st_component(const char *path)
 362{
 363        return is_dir_sep(path[0]);
 364}
 365#define offset_1st_component git_offset_1st_component
 366#endif
 367
 368#ifndef find_last_dir_sep
 369static inline char *git_find_last_dir_sep(const char *path)
 370{
 371        return strrchr(path, '/');
 372}
 373#define find_last_dir_sep git_find_last_dir_sep
 374#endif
 375
 376#if defined(__HP_cc) && (__HP_cc >= 61000)
 377#define NORETURN __attribute__((noreturn))
 378#define NORETURN_PTR
 379#elif defined(__GNUC__) && !defined(NO_NORETURN)
 380#define NORETURN __attribute__((__noreturn__))
 381#define NORETURN_PTR __attribute__((__noreturn__))
 382#elif defined(_MSC_VER)
 383#define NORETURN __declspec(noreturn)
 384#define NORETURN_PTR
 385#else
 386#define NORETURN
 387#define NORETURN_PTR
 388#ifndef __GNUC__
 389#ifndef __attribute__
 390#define __attribute__(x)
 391#endif
 392#endif
 393#endif
 394
 395/* The sentinel attribute is valid from gcc version 4.0 */
 396#if defined(__GNUC__) && (__GNUC__ >= 4)
 397#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 398#else
 399#define LAST_ARG_MUST_BE_NULL
 400#endif
 401
 402#include "compat/bswap.h"
 403
 404#include "wildmatch.h"
 405
 406struct strbuf;
 407
 408/* General helper functions */
 409extern void vreportf(const char *prefix, const char *err, va_list params);
 410extern NORETURN void usage(const char *err);
 411extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 412extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 413extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 414extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 415extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 416
 417#ifndef NO_OPENSSL
 418#ifdef APPLE_COMMON_CRYPTO
 419#include "compat/apple-common-crypto.h"
 420#else
 421#include <openssl/evp.h>
 422#include <openssl/hmac.h>
 423#endif /* APPLE_COMMON_CRYPTO */
 424#include <openssl/x509v3.h>
 425#endif /* NO_OPENSSL */
 426
 427/*
 428 * Let callers be aware of the constant return value; this can help
 429 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 430 * because some compilers may not support variadic macros. Since we're only
 431 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 432 * using the function as usual.
 433 */
 434#if defined(__GNUC__)
 435static inline int const_error(void)
 436{
 437        return -1;
 438}
 439#define error(...) (error(__VA_ARGS__), const_error())
 440#endif
 441
 442extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 443extern void set_error_routine(void (*routine)(const char *err, va_list params));
 444extern void set_die_is_recursing_routine(int (*routine)(void));
 445extern void set_error_handle(FILE *);
 446
 447extern int starts_with(const char *str, const char *prefix);
 448
 449/*
 450 * If the string "str" begins with the string found in "prefix", return 1.
 451 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 452 * the string right after the prefix).
 453 *
 454 * Otherwise, return 0 and leave "out" untouched.
 455 *
 456 * Examples:
 457 *
 458 *   [extract branch name, fail if not a branch]
 459 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 460 *      return -1;
 461 *
 462 *   [skip prefix if present, otherwise use whole string]
 463 *   skip_prefix(name, "refs/heads/", &name);
 464 */
 465static inline int skip_prefix(const char *str, const char *prefix,
 466                              const char **out)
 467{
 468        do {
 469                if (!*prefix) {
 470                        *out = str;
 471                        return 1;
 472                }
 473        } while (*str++ == *prefix++);
 474        return 0;
 475}
 476
 477/*
 478 * If buf ends with suffix, return 1 and subtract the length of the suffix
 479 * from *len. Otherwise, return 0 and leave *len untouched.
 480 */
 481static inline int strip_suffix_mem(const char *buf, size_t *len,
 482                                   const char *suffix)
 483{
 484        size_t suflen = strlen(suffix);
 485        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 486                return 0;
 487        *len -= suflen;
 488        return 1;
 489}
 490
 491/*
 492 * If str ends with suffix, return 1 and set *len to the size of the string
 493 * without the suffix. Otherwise, return 0 and set *len to the size of the
 494 * string.
 495 *
 496 * Note that we do _not_ NUL-terminate str to the new length.
 497 */
 498static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 499{
 500        *len = strlen(str);
 501        return strip_suffix_mem(str, len, suffix);
 502}
 503
 504static inline int ends_with(const char *str, const char *suffix)
 505{
 506        size_t len;
 507        return strip_suffix(str, suffix, &len);
 508}
 509
 510#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 511
 512#ifndef PROT_READ
 513#define PROT_READ 1
 514#define PROT_WRITE 2
 515#define MAP_PRIVATE 1
 516#endif
 517
 518#define mmap git_mmap
 519#define munmap git_munmap
 520extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 521extern int git_munmap(void *start, size_t length);
 522
 523#else /* NO_MMAP || USE_WIN32_MMAP */
 524
 525#include <sys/mman.h>
 526
 527#endif /* NO_MMAP || USE_WIN32_MMAP */
 528
 529#ifdef NO_MMAP
 530
 531/* This value must be multiple of (pagesize * 2) */
 532#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 533
 534#else /* NO_MMAP */
 535
 536/* This value must be multiple of (pagesize * 2) */
 537#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 538        (sizeof(void*) >= 8 \
 539                ?  1 * 1024 * 1024 * 1024 \
 540                : 32 * 1024 * 1024)
 541
 542#endif /* NO_MMAP */
 543
 544#ifndef MAP_FAILED
 545#define MAP_FAILED ((void *)-1)
 546#endif
 547
 548#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 549#define on_disk_bytes(st) ((st).st_size)
 550#else
 551#define on_disk_bytes(st) ((st).st_blocks * 512)
 552#endif
 553
 554#ifdef NEEDS_MODE_TRANSLATION
 555#undef S_IFMT
 556#undef S_IFREG
 557#undef S_IFDIR
 558#undef S_IFLNK
 559#undef S_IFBLK
 560#undef S_IFCHR
 561#undef S_IFIFO
 562#undef S_IFSOCK
 563#define S_IFMT   0170000
 564#define S_IFREG  0100000
 565#define S_IFDIR  0040000
 566#define S_IFLNK  0120000
 567#define S_IFBLK  0060000
 568#define S_IFCHR  0020000
 569#define S_IFIFO  0010000
 570#define S_IFSOCK 0140000
 571#ifdef stat
 572#undef stat
 573#endif
 574#define stat(path, buf) git_stat(path, buf)
 575extern int git_stat(const char *, struct stat *);
 576#ifdef fstat
 577#undef fstat
 578#endif
 579#define fstat(fd, buf) git_fstat(fd, buf)
 580extern int git_fstat(int, struct stat *);
 581#ifdef lstat
 582#undef lstat
 583#endif
 584#define lstat(path, buf) git_lstat(path, buf)
 585extern int git_lstat(const char *, struct stat *);
 586#endif
 587
 588#define DEFAULT_PACKED_GIT_LIMIT \
 589        ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 590
 591#ifdef NO_PREAD
 592#define pread git_pread
 593extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 594#endif
 595/*
 596 * Forward decl that will remind us if its twin in cache.h changes.
 597 * This function is used in compat/pread.c.  But we can't include
 598 * cache.h there.
 599 */
 600extern ssize_t read_in_full(int fd, void *buf, size_t count);
 601
 602#ifdef NO_SETENV
 603#define setenv gitsetenv
 604extern int gitsetenv(const char *, const char *, int);
 605#endif
 606
 607#ifdef NO_MKDTEMP
 608#define mkdtemp gitmkdtemp
 609extern char *gitmkdtemp(char *);
 610#endif
 611
 612#ifdef NO_MKSTEMPS
 613#define mkstemps gitmkstemps
 614extern int gitmkstemps(char *, int);
 615#endif
 616
 617#ifdef NO_UNSETENV
 618#define unsetenv gitunsetenv
 619extern void gitunsetenv(const char *);
 620#endif
 621
 622#ifdef NO_STRCASESTR
 623#define strcasestr gitstrcasestr
 624extern char *gitstrcasestr(const char *haystack, const char *needle);
 625#endif
 626
 627#ifdef NO_STRLCPY
 628#define strlcpy gitstrlcpy
 629extern size_t gitstrlcpy(char *, const char *, size_t);
 630#endif
 631
 632#ifdef NO_STRTOUMAX
 633#define strtoumax gitstrtoumax
 634extern uintmax_t gitstrtoumax(const char *, char **, int);
 635#define strtoimax gitstrtoimax
 636extern intmax_t gitstrtoimax(const char *, char **, int);
 637#endif
 638
 639#ifdef NO_HSTRERROR
 640#define hstrerror githstrerror
 641extern const char *githstrerror(int herror);
 642#endif
 643
 644#ifdef NO_MEMMEM
 645#define memmem gitmemmem
 646void *gitmemmem(const void *haystack, size_t haystacklen,
 647                const void *needle, size_t needlelen);
 648#endif
 649
 650#ifdef NO_GETPAGESIZE
 651#define getpagesize() sysconf(_SC_PAGESIZE)
 652#endif
 653
 654#ifdef FREAD_READS_DIRECTORIES
 655#ifdef fopen
 656#undef fopen
 657#endif
 658#define fopen(a,b) git_fopen(a,b)
 659extern FILE *git_fopen(const char*, const char*);
 660#endif
 661
 662#ifdef SNPRINTF_RETURNS_BOGUS
 663#ifdef snprintf
 664#undef snprintf
 665#endif
 666#define snprintf git_snprintf
 667extern int git_snprintf(char *str, size_t maxsize,
 668                        const char *format, ...);
 669#ifdef vsnprintf
 670#undef vsnprintf
 671#endif
 672#define vsnprintf git_vsnprintf
 673extern int git_vsnprintf(char *str, size_t maxsize,
 674                         const char *format, va_list ap);
 675#endif
 676
 677#ifdef __GLIBC_PREREQ
 678#if __GLIBC_PREREQ(2, 1)
 679#define HAVE_STRCHRNUL
 680#endif
 681#endif
 682
 683#ifndef HAVE_STRCHRNUL
 684#define strchrnul gitstrchrnul
 685static inline char *gitstrchrnul(const char *s, int c)
 686{
 687        while (*s && *s != c)
 688                s++;
 689        return (char *)s;
 690}
 691#endif
 692
 693#ifdef NO_INET_PTON
 694int inet_pton(int af, const char *src, void *dst);
 695#endif
 696
 697#ifdef NO_INET_NTOP
 698const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 699#endif
 700
 701#ifdef NO_PTHREADS
 702#define atexit git_atexit
 703extern int git_atexit(void (*handler)(void));
 704#endif
 705
 706extern void release_pack_memory(size_t);
 707
 708typedef void (*try_to_free_t)(size_t);
 709extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 710
 711static inline size_t st_add(size_t a, size_t b)
 712{
 713        if (unsigned_add_overflows(a, b))
 714                die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 715                    (uintmax_t)a, (uintmax_t)b);
 716        return a + b;
 717}
 718#define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
 719#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 720
 721static inline size_t st_mult(size_t a, size_t b)
 722{
 723        if (unsigned_mult_overflows(a, b))
 724                die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 725                    (uintmax_t)a, (uintmax_t)b);
 726        return a * b;
 727}
 728
 729static inline size_t st_sub(size_t a, size_t b)
 730{
 731        if (a < b)
 732                die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 733                    (uintmax_t)a, (uintmax_t)b);
 734        return a - b;
 735}
 736
 737#ifdef HAVE_ALLOCA_H
 738# include <alloca.h>
 739# define xalloca(size)      (alloca(size))
 740# define xalloca_free(p)    do {} while (0)
 741#else
 742# define xalloca(size)      (xmalloc(size))
 743# define xalloca_free(p)    (free(p))
 744#endif
 745extern char *xstrdup(const char *str);
 746extern void *xmalloc(size_t size);
 747extern void *xmallocz(size_t size);
 748extern void *xmallocz_gently(size_t size);
 749extern void *xmemdupz(const void *data, size_t len);
 750extern char *xstrndup(const char *str, size_t len);
 751extern void *xrealloc(void *ptr, size_t size);
 752extern void *xcalloc(size_t nmemb, size_t size);
 753extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 754extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 755extern int xopen(const char *path, int flags, ...);
 756extern ssize_t xread(int fd, void *buf, size_t len);
 757extern ssize_t xwrite(int fd, const void *buf, size_t len);
 758extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 759extern int xdup(int fd);
 760extern FILE *xfopen(const char *path, const char *mode);
 761extern FILE *xfdopen(int fd, const char *mode);
 762extern int xmkstemp(char *template);
 763extern int xmkstemp_mode(char *template, int mode);
 764extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 765extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 766extern char *xgetcwd(void);
 767extern FILE *fopen_for_writing(const char *path);
 768
 769#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
 770#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 771
 772/*
 773 * These functions help you allocate structs with flex arrays, and copy
 774 * the data directly into the array. For example, if you had:
 775 *
 776 *   struct foo {
 777 *     int bar;
 778 *     char name[FLEX_ARRAY];
 779 *   };
 780 *
 781 * you can do:
 782 *
 783 *   struct foo *f;
 784 *   FLEX_ALLOC_MEM(f, name, src, len);
 785 *
 786 * to allocate a "foo" with the contents of "src" in the "name" field.
 787 * The resulting struct is automatically zero'd, and the flex-array field
 788 * is NUL-terminated (whether the incoming src buffer was or not).
 789 *
 790 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
 791 * but do want to store a pointer to some extra data in the same allocated
 792 * block. For example, if you have:
 793 *
 794 *   struct foo {
 795 *     char *name;
 796 *     int bar;
 797 *   };
 798 *
 799 * you can do:
 800 *
 801 *   struct foo *f;
 802 *   FLEX_ALLOC_STR(f, name, src);
 803 *
 804 * and "name" will point to a block of memory after the struct, which will be
 805 * freed along with the struct (but the pointer can be repointed anywhere).
 806 *
 807 * The *_STR variants accept a string parameter rather than a ptr/len
 808 * combination.
 809 *
 810 * Note that these macros will evaluate the first parameter multiple
 811 * times, and it must be assignable as an lvalue.
 812 */
 813#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
 814        (x) = NULL; /* silence -Wuninitialized for offset calculation */ \
 815        (x) = xalloc_flex(sizeof(*(x)), (char *)(&((x)->flexname)) - (char *)(x), (buf), (len)); \
 816} while (0)
 817#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
 818        (x) = xalloc_flex(sizeof(*(x)), sizeof(*(x)), (buf), (len)); \
 819        (x)->ptrname = (void *)((x)+1); \
 820} while(0)
 821#define FLEX_ALLOC_STR(x, flexname, str) \
 822        FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
 823#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
 824        FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
 825
 826static inline void *xalloc_flex(size_t base_len, size_t offset,
 827                                const void *src, size_t src_len)
 828{
 829        unsigned char *ret = xcalloc(1, st_add3(base_len, src_len, 1));
 830        memcpy(ret + offset, src, src_len);
 831        return ret;
 832}
 833
 834static inline char *xstrdup_or_null(const char *str)
 835{
 836        return str ? xstrdup(str) : NULL;
 837}
 838
 839static inline size_t xsize_t(off_t len)
 840{
 841        if (len > (size_t) len)
 842                die("Cannot handle files this big");
 843        return (size_t)len;
 844}
 845
 846__attribute__((format (printf, 3, 4)))
 847extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 848
 849/* in ctype.c, for kwset users */
 850extern const unsigned char tolower_trans_tbl[256];
 851
 852/* Sane ctype - no locale, and works with signed chars */
 853#undef isascii
 854#undef isspace
 855#undef isdigit
 856#undef isalpha
 857#undef isalnum
 858#undef isprint
 859#undef islower
 860#undef isupper
 861#undef tolower
 862#undef toupper
 863#undef iscntrl
 864#undef ispunct
 865#undef isxdigit
 866
 867extern const unsigned char sane_ctype[256];
 868#define GIT_SPACE 0x01
 869#define GIT_DIGIT 0x02
 870#define GIT_ALPHA 0x04
 871#define GIT_GLOB_SPECIAL 0x08
 872#define GIT_REGEX_SPECIAL 0x10
 873#define GIT_PATHSPEC_MAGIC 0x20
 874#define GIT_CNTRL 0x40
 875#define GIT_PUNCT 0x80
 876#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 877#define isascii(x) (((x) & ~0x7f) == 0)
 878#define isspace(x) sane_istest(x,GIT_SPACE)
 879#define isdigit(x) sane_istest(x,GIT_DIGIT)
 880#define isalpha(x) sane_istest(x,GIT_ALPHA)
 881#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 882#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 883#define islower(x) sane_iscase(x, 1)
 884#define isupper(x) sane_iscase(x, 0)
 885#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 886#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 887#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 888#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 889                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 890#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 891#define tolower(x) sane_case((unsigned char)(x), 0x20)
 892#define toupper(x) sane_case((unsigned char)(x), 0)
 893#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 894
 895static inline int sane_case(int x, int high)
 896{
 897        if (sane_istest(x, GIT_ALPHA))
 898                x = (x & ~0x20) | high;
 899        return x;
 900}
 901
 902static inline int sane_iscase(int x, int is_lower)
 903{
 904        if (!sane_istest(x, GIT_ALPHA))
 905                return 0;
 906
 907        if (is_lower)
 908                return (x & 0x20) != 0;
 909        else
 910                return (x & 0x20) == 0;
 911}
 912
 913static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 914{
 915        unsigned long ul;
 916        char *p;
 917
 918        errno = 0;
 919        /* negative values would be accepted by strtoul */
 920        if (strchr(s, '-'))
 921                return -1;
 922        ul = strtoul(s, &p, base);
 923        if (errno || *p || p == s || (unsigned int) ul != ul)
 924                return -1;
 925        *result = ul;
 926        return 0;
 927}
 928
 929static inline int strtol_i(char const *s, int base, int *result)
 930{
 931        long ul;
 932        char *p;
 933
 934        errno = 0;
 935        ul = strtol(s, &p, base);
 936        if (errno || *p || p == s || (int) ul != ul)
 937                return -1;
 938        *result = ul;
 939        return 0;
 940}
 941
 942#ifdef INTERNAL_QSORT
 943void git_qsort(void *base, size_t nmemb, size_t size,
 944               int(*compar)(const void *, const void *));
 945#define qsort git_qsort
 946#endif
 947
 948#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 949# define FORCE_DIR_SET_GID S_ISGID
 950#else
 951# define FORCE_DIR_SET_GID 0
 952#endif
 953
 954#ifdef NO_NSEC
 955#undef USE_NSEC
 956#define ST_CTIME_NSEC(st) 0
 957#define ST_MTIME_NSEC(st) 0
 958#else
 959#ifdef USE_ST_TIMESPEC
 960#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 961#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 962#else
 963#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 964#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 965#endif
 966#endif
 967
 968#ifdef UNRELIABLE_FSTAT
 969#define fstat_is_reliable() 0
 970#else
 971#define fstat_is_reliable() 1
 972#endif
 973
 974#ifndef va_copy
 975/*
 976 * Since an obvious implementation of va_list would be to make it a
 977 * pointer into the stack frame, a simple assignment will work on
 978 * many systems.  But let's try to be more portable.
 979 */
 980#ifdef __va_copy
 981#define va_copy(dst, src) __va_copy(dst, src)
 982#else
 983#define va_copy(dst, src) ((dst) = (src))
 984#endif
 985#endif
 986
 987#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 988#define HAVE_VARIADIC_MACROS 1
 989#endif
 990
 991/*
 992 * Preserves errno, prints a message, but gives no warning for ENOENT.
 993 * Returns 0 on success, which includes trying to unlink an object that does
 994 * not exist.
 995 */
 996int unlink_or_warn(const char *path);
 997 /*
 998  * Tries to unlink file.  Returns 0 if unlink succeeded
 999  * or the file already didn't exist.  Returns -1 and
1000  * appends a message to err suitable for
1001  * 'error("%s", err->buf)' on error.
1002  */
1003int unlink_or_msg(const char *file, struct strbuf *err);
1004/*
1005 * Preserves errno, prints a message, but gives no warning for ENOENT.
1006 * Returns 0 on success, which includes trying to remove a directory that does
1007 * not exist.
1008 */
1009int rmdir_or_warn(const char *path);
1010/*
1011 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1012 * the supplied file mode.
1013 */
1014int remove_or_warn(unsigned int mode, const char *path);
1015
1016/*
1017 * Call access(2), but warn for any error except "missing file"
1018 * (ENOENT or ENOTDIR).
1019 */
1020#define ACCESS_EACCES_OK (1U << 0)
1021int access_or_warn(const char *path, int mode, unsigned flag);
1022int access_or_die(const char *path, int mode, unsigned flag);
1023
1024/* Warn on an inaccessible file that ought to be accessible */
1025void warn_on_inaccessible(const char *path);
1026
1027#ifdef GMTIME_UNRELIABLE_ERRORS
1028struct tm *git_gmtime(const time_t *);
1029struct tm *git_gmtime_r(const time_t *, struct tm *);
1030#define gmtime git_gmtime
1031#define gmtime_r git_gmtime_r
1032#endif
1033
1034#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1035#define USE_PARENS_AROUND_GETTEXT_N 1
1036#endif
1037
1038#ifndef SHELL_PATH
1039# define SHELL_PATH "/bin/sh"
1040#endif
1041
1042#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1043#define flockfile(fh)
1044#define funlockfile(fh)
1045#define getc_unlocked(fh) getc(fh)
1046#endif
1047
1048#endif