Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit Merge branch 'sg/test-lib-simplify-expr-away' into HEAD (777dec6)
   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#endif
 283
 284/* On most systems <netdb.h> would have given us this, but
 285 * not on some systems (e.g. z/OS).
 286 */
 287#ifndef NI_MAXHOST
 288#define NI_MAXHOST 1025
 289#endif
 290
 291#ifndef NI_MAXSERV
 292#define NI_MAXSERV 32
 293#endif
 294
 295/* On most systems <limits.h> would have given us this, but
 296 * not on some systems (e.g. GNU/Hurd).
 297 */
 298#ifndef PATH_MAX
 299#define PATH_MAX 4096
 300#endif
 301
 302#ifndef PRIuMAX
 303#define PRIuMAX "llu"
 304#endif
 305
 306#ifndef SCNuMAX
 307#define SCNuMAX PRIuMAX
 308#endif
 309
 310#ifndef PRIu32
 311#define PRIu32 "u"
 312#endif
 313
 314#ifndef PRIx32
 315#define PRIx32 "x"
 316#endif
 317
 318#ifndef PRIo32
 319#define PRIo32 "o"
 320#endif
 321
 322#ifndef PATH_SEP
 323#define PATH_SEP ':'
 324#endif
 325
 326#ifdef HAVE_PATHS_H
 327#include <paths.h>
 328#endif
 329#ifndef _PATH_DEFPATH
 330#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 331#endif
 332
 333#ifndef has_dos_drive_prefix
 334static inline int git_has_dos_drive_prefix(const char *path)
 335{
 336        return 0;
 337}
 338#define has_dos_drive_prefix git_has_dos_drive_prefix
 339#endif
 340
 341#ifndef skip_dos_drive_prefix
 342static inline int git_skip_dos_drive_prefix(char **path)
 343{
 344        return 0;
 345}
 346#define skip_dos_drive_prefix git_skip_dos_drive_prefix
 347#endif
 348
 349#ifndef is_dir_sep
 350static inline int git_is_dir_sep(int c)
 351{
 352        return c == '/';
 353}
 354#define is_dir_sep git_is_dir_sep
 355#endif
 356
 357#ifndef offset_1st_component
 358static inline int git_offset_1st_component(const char *path)
 359{
 360        return is_dir_sep(path[0]);
 361}
 362#define offset_1st_component git_offset_1st_component
 363#endif
 364
 365#ifndef find_last_dir_sep
 366static inline char *git_find_last_dir_sep(const char *path)
 367{
 368        return strrchr(path, '/');
 369}
 370#define find_last_dir_sep git_find_last_dir_sep
 371#endif
 372
 373#if defined(__HP_cc) && (__HP_cc >= 61000)
 374#define NORETURN __attribute__((noreturn))
 375#define NORETURN_PTR
 376#elif defined(__GNUC__) && !defined(NO_NORETURN)
 377#define NORETURN __attribute__((__noreturn__))
 378#define NORETURN_PTR __attribute__((__noreturn__))
 379#elif defined(_MSC_VER)
 380#define NORETURN __declspec(noreturn)
 381#define NORETURN_PTR
 382#else
 383#define NORETURN
 384#define NORETURN_PTR
 385#ifndef __GNUC__
 386#ifndef __attribute__
 387#define __attribute__(x)
 388#endif
 389#endif
 390#endif
 391
 392/* The sentinel attribute is valid from gcc version 4.0 */
 393#if defined(__GNUC__) && (__GNUC__ >= 4)
 394#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 395#else
 396#define LAST_ARG_MUST_BE_NULL
 397#endif
 398
 399#include "compat/bswap.h"
 400
 401#include "wildmatch.h"
 402
 403struct strbuf;
 404
 405/* General helper functions */
 406extern void vreportf(const char *prefix, const char *err, va_list params);
 407extern NORETURN void usage(const char *err);
 408extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 409extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 410extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 411extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 412extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 413
 414#ifndef NO_OPENSSL
 415#ifdef APPLE_COMMON_CRYPTO
 416#include "compat/apple-common-crypto.h"
 417#else
 418#include <openssl/evp.h>
 419#include <openssl/hmac.h>
 420#endif /* APPLE_COMMON_CRYPTO */
 421#include <openssl/x509v3.h>
 422#endif /* NO_OPENSSL */
 423
 424/*
 425 * Let callers be aware of the constant return value; this can help
 426 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 427 * because some compilers may not support variadic macros. Since we're only
 428 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 429 * using the function as usual.
 430 */
 431#if defined(__GNUC__)
 432static inline int const_error(void)
 433{
 434        return -1;
 435}
 436#define error(...) (error(__VA_ARGS__), const_error())
 437#endif
 438
 439extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 440extern void set_error_routine(void (*routine)(const char *err, va_list params));
 441extern void set_die_is_recursing_routine(int (*routine)(void));
 442extern void set_error_handle(FILE *);
 443
 444extern int starts_with(const char *str, const char *prefix);
 445
 446/*
 447 * If the string "str" begins with the string found in "prefix", return 1.
 448 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 449 * the string right after the prefix).
 450 *
 451 * Otherwise, return 0 and leave "out" untouched.
 452 *
 453 * Examples:
 454 *
 455 *   [extract branch name, fail if not a branch]
 456 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 457 *      return -1;
 458 *
 459 *   [skip prefix if present, otherwise use whole string]
 460 *   skip_prefix(name, "refs/heads/", &name);
 461 */
 462static inline int skip_prefix(const char *str, const char *prefix,
 463                              const char **out)
 464{
 465        do {
 466                if (!*prefix) {
 467                        *out = str;
 468                        return 1;
 469                }
 470        } while (*str++ == *prefix++);
 471        return 0;
 472}
 473
 474/*
 475 * If buf ends with suffix, return 1 and subtract the length of the suffix
 476 * from *len. Otherwise, return 0 and leave *len untouched.
 477 */
 478static inline int strip_suffix_mem(const char *buf, size_t *len,
 479                                   const char *suffix)
 480{
 481        size_t suflen = strlen(suffix);
 482        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 483                return 0;
 484        *len -= suflen;
 485        return 1;
 486}
 487
 488/*
 489 * If str ends with suffix, return 1 and set *len to the size of the string
 490 * without the suffix. Otherwise, return 0 and set *len to the size of the
 491 * string.
 492 *
 493 * Note that we do _not_ NUL-terminate str to the new length.
 494 */
 495static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 496{
 497        *len = strlen(str);
 498        return strip_suffix_mem(str, len, suffix);
 499}
 500
 501static inline int ends_with(const char *str, const char *suffix)
 502{
 503        size_t len;
 504        return strip_suffix(str, suffix, &len);
 505}
 506
 507#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 508
 509#ifndef PROT_READ
 510#define PROT_READ 1
 511#define PROT_WRITE 2
 512#define MAP_PRIVATE 1
 513#endif
 514
 515#define mmap git_mmap
 516#define munmap git_munmap
 517extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 518extern int git_munmap(void *start, size_t length);
 519
 520#else /* NO_MMAP || USE_WIN32_MMAP */
 521
 522#include <sys/mman.h>
 523
 524#endif /* NO_MMAP || USE_WIN32_MMAP */
 525
 526#ifdef NO_MMAP
 527
 528/* This value must be multiple of (pagesize * 2) */
 529#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 530
 531#else /* NO_MMAP */
 532
 533/* This value must be multiple of (pagesize * 2) */
 534#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 535        (sizeof(void*) >= 8 \
 536                ?  1 * 1024 * 1024 * 1024 \
 537                : 32 * 1024 * 1024)
 538
 539#endif /* NO_MMAP */
 540
 541#ifndef MAP_FAILED
 542#define MAP_FAILED ((void *)-1)
 543#endif
 544
 545#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 546#define on_disk_bytes(st) ((st).st_size)
 547#else
 548#define on_disk_bytes(st) ((st).st_blocks * 512)
 549#endif
 550
 551#ifdef NEEDS_MODE_TRANSLATION
 552#undef S_IFMT
 553#undef S_IFREG
 554#undef S_IFDIR
 555#undef S_IFLNK
 556#undef S_IFBLK
 557#undef S_IFCHR
 558#undef S_IFIFO
 559#undef S_IFSOCK
 560#define S_IFMT   0170000
 561#define S_IFREG  0100000
 562#define S_IFDIR  0040000
 563#define S_IFLNK  0120000
 564#define S_IFBLK  0060000
 565#define S_IFCHR  0020000
 566#define S_IFIFO  0010000
 567#define S_IFSOCK 0140000
 568#ifdef stat
 569#undef stat
 570#endif
 571#define stat(path, buf) git_stat(path, buf)
 572extern int git_stat(const char *, struct stat *);
 573#ifdef fstat
 574#undef fstat
 575#endif
 576#define fstat(fd, buf) git_fstat(fd, buf)
 577extern int git_fstat(int, struct stat *);
 578#ifdef lstat
 579#undef lstat
 580#endif
 581#define lstat(path, buf) git_lstat(path, buf)
 582extern int git_lstat(const char *, struct stat *);
 583#endif
 584
 585#define DEFAULT_PACKED_GIT_LIMIT \
 586        ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 587
 588#ifdef NO_PREAD
 589#define pread git_pread
 590extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 591#endif
 592/*
 593 * Forward decl that will remind us if its twin in cache.h changes.
 594 * This function is used in compat/pread.c.  But we can't include
 595 * cache.h there.
 596 */
 597extern ssize_t read_in_full(int fd, void *buf, size_t count);
 598
 599#ifdef NO_SETENV
 600#define setenv gitsetenv
 601extern int gitsetenv(const char *, const char *, int);
 602#endif
 603
 604#ifdef NO_MKDTEMP
 605#define mkdtemp gitmkdtemp
 606extern char *gitmkdtemp(char *);
 607#endif
 608
 609#ifdef NO_MKSTEMPS
 610#define mkstemps gitmkstemps
 611extern int gitmkstemps(char *, int);
 612#endif
 613
 614#ifdef NO_UNSETENV
 615#define unsetenv gitunsetenv
 616extern void gitunsetenv(const char *);
 617#endif
 618
 619#ifdef NO_STRCASESTR
 620#define strcasestr gitstrcasestr
 621extern char *gitstrcasestr(const char *haystack, const char *needle);
 622#endif
 623
 624#ifdef NO_STRLCPY
 625#define strlcpy gitstrlcpy
 626extern size_t gitstrlcpy(char *, const char *, size_t);
 627#endif
 628
 629#ifdef NO_STRTOUMAX
 630#define strtoumax gitstrtoumax
 631extern uintmax_t gitstrtoumax(const char *, char **, int);
 632#define strtoimax gitstrtoimax
 633extern intmax_t gitstrtoimax(const char *, char **, int);
 634#endif
 635
 636#ifdef NO_HSTRERROR
 637#define hstrerror githstrerror
 638extern const char *githstrerror(int herror);
 639#endif
 640
 641#ifdef NO_MEMMEM
 642#define memmem gitmemmem
 643void *gitmemmem(const void *haystack, size_t haystacklen,
 644                const void *needle, size_t needlelen);
 645#endif
 646
 647#ifdef NO_GETPAGESIZE
 648#define getpagesize() sysconf(_SC_PAGESIZE)
 649#endif
 650
 651#ifdef FREAD_READS_DIRECTORIES
 652#ifdef fopen
 653#undef fopen
 654#endif
 655#define fopen(a,b) git_fopen(a,b)
 656extern FILE *git_fopen(const char*, const char*);
 657#endif
 658
 659#ifdef SNPRINTF_RETURNS_BOGUS
 660#ifdef snprintf
 661#undef snprintf
 662#endif
 663#define snprintf git_snprintf
 664extern int git_snprintf(char *str, size_t maxsize,
 665                        const char *format, ...);
 666#ifdef vsnprintf
 667#undef vsnprintf
 668#endif
 669#define vsnprintf git_vsnprintf
 670extern int git_vsnprintf(char *str, size_t maxsize,
 671                         const char *format, va_list ap);
 672#endif
 673
 674#ifdef __GLIBC_PREREQ
 675#if __GLIBC_PREREQ(2, 1)
 676#define HAVE_STRCHRNUL
 677#endif
 678#endif
 679
 680#ifndef HAVE_STRCHRNUL
 681#define strchrnul gitstrchrnul
 682static inline char *gitstrchrnul(const char *s, int c)
 683{
 684        while (*s && *s != c)
 685                s++;
 686        return (char *)s;
 687}
 688#endif
 689
 690#ifdef NO_INET_PTON
 691int inet_pton(int af, const char *src, void *dst);
 692#endif
 693
 694#ifdef NO_INET_NTOP
 695const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 696#endif
 697
 698#ifdef NO_PTHREADS
 699#define atexit git_atexit
 700extern int git_atexit(void (*handler)(void));
 701#endif
 702
 703extern void release_pack_memory(size_t);
 704
 705typedef void (*try_to_free_t)(size_t);
 706extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 707
 708static inline size_t st_add(size_t a, size_t b)
 709{
 710        if (unsigned_add_overflows(a, b))
 711                die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 712                    (uintmax_t)a, (uintmax_t)b);
 713        return a + b;
 714}
 715#define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
 716#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 717
 718static inline size_t st_mult(size_t a, size_t b)
 719{
 720        if (unsigned_mult_overflows(a, b))
 721                die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 722                    (uintmax_t)a, (uintmax_t)b);
 723        return a * b;
 724}
 725
 726static inline size_t st_sub(size_t a, size_t b)
 727{
 728        if (a < b)
 729                die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 730                    (uintmax_t)a, (uintmax_t)b);
 731        return a - b;
 732}
 733
 734#ifdef HAVE_ALLOCA_H
 735# include <alloca.h>
 736# define xalloca(size)      (alloca(size))
 737# define xalloca_free(p)    do {} while (0)
 738#else
 739# define xalloca(size)      (xmalloc(size))
 740# define xalloca_free(p)    (free(p))
 741#endif
 742extern char *xstrdup(const char *str);
 743extern void *xmalloc(size_t size);
 744extern void *xmallocz(size_t size);
 745extern void *xmallocz_gently(size_t size);
 746extern void *xmemdupz(const void *data, size_t len);
 747extern char *xstrndup(const char *str, size_t len);
 748extern void *xrealloc(void *ptr, size_t size);
 749extern void *xcalloc(size_t nmemb, size_t size);
 750extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 751extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 752extern int xopen(const char *path, int flags, ...);
 753extern ssize_t xread(int fd, void *buf, size_t len);
 754extern ssize_t xwrite(int fd, const void *buf, size_t len);
 755extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 756extern int xdup(int fd);
 757extern FILE *xfopen(const char *path, const char *mode);
 758extern FILE *xfdopen(int fd, const char *mode);
 759extern int xmkstemp(char *template);
 760extern int xmkstemp_mode(char *template, int mode);
 761extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 762extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 763extern char *xgetcwd(void);
 764extern FILE *fopen_for_writing(const char *path);
 765
 766#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
 767#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 768
 769/*
 770 * These functions help you allocate structs with flex arrays, and copy
 771 * the data directly into the array. For example, if you had:
 772 *
 773 *   struct foo {
 774 *     int bar;
 775 *     char name[FLEX_ARRAY];
 776 *   };
 777 *
 778 * you can do:
 779 *
 780 *   struct foo *f;
 781 *   FLEX_ALLOC_MEM(f, name, src, len);
 782 *
 783 * to allocate a "foo" with the contents of "src" in the "name" field.
 784 * The resulting struct is automatically zero'd, and the flex-array field
 785 * is NUL-terminated (whether the incoming src buffer was or not).
 786 *
 787 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
 788 * but do want to store a pointer to some extra data in the same allocated
 789 * block. For example, if you have:
 790 *
 791 *   struct foo {
 792 *     char *name;
 793 *     int bar;
 794 *   };
 795 *
 796 * you can do:
 797 *
 798 *   struct foo *f;
 799 *   FLEX_ALLOC_STR(f, name, src);
 800 *
 801 * and "name" will point to a block of memory after the struct, which will be
 802 * freed along with the struct (but the pointer can be repointed anywhere).
 803 *
 804 * The *_STR variants accept a string parameter rather than a ptr/len
 805 * combination.
 806 *
 807 * Note that these macros will evaluate the first parameter multiple
 808 * times, and it must be assignable as an lvalue.
 809 */
 810#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
 811        (x) = NULL; /* silence -Wuninitialized for offset calculation */ \
 812        (x) = xalloc_flex(sizeof(*(x)), (char *)(&((x)->flexname)) - (char *)(x), (buf), (len)); \
 813} while (0)
 814#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
 815        (x) = xalloc_flex(sizeof(*(x)), sizeof(*(x)), (buf), (len)); \
 816        (x)->ptrname = (void *)((x)+1); \
 817} while(0)
 818#define FLEX_ALLOC_STR(x, flexname, str) \
 819        FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
 820#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
 821        FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
 822
 823static inline void *xalloc_flex(size_t base_len, size_t offset,
 824                                const void *src, size_t src_len)
 825{
 826        unsigned char *ret = xcalloc(1, st_add3(base_len, src_len, 1));
 827        memcpy(ret + offset, src, src_len);
 828        return ret;
 829}
 830
 831static inline char *xstrdup_or_null(const char *str)
 832{
 833        return str ? xstrdup(str) : NULL;
 834}
 835
 836static inline size_t xsize_t(off_t len)
 837{
 838        if (len > (size_t) len)
 839                die("Cannot handle files this big");
 840        return (size_t)len;
 841}
 842
 843__attribute__((format (printf, 3, 4)))
 844extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 845
 846/* in ctype.c, for kwset users */
 847extern const unsigned char tolower_trans_tbl[256];
 848
 849/* Sane ctype - no locale, and works with signed chars */
 850#undef isascii
 851#undef isspace
 852#undef isdigit
 853#undef isalpha
 854#undef isalnum
 855#undef isprint
 856#undef islower
 857#undef isupper
 858#undef tolower
 859#undef toupper
 860#undef iscntrl
 861#undef ispunct
 862#undef isxdigit
 863
 864extern const unsigned char sane_ctype[256];
 865#define GIT_SPACE 0x01
 866#define GIT_DIGIT 0x02
 867#define GIT_ALPHA 0x04
 868#define GIT_GLOB_SPECIAL 0x08
 869#define GIT_REGEX_SPECIAL 0x10
 870#define GIT_PATHSPEC_MAGIC 0x20
 871#define GIT_CNTRL 0x40
 872#define GIT_PUNCT 0x80
 873#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 874#define isascii(x) (((x) & ~0x7f) == 0)
 875#define isspace(x) sane_istest(x,GIT_SPACE)
 876#define isdigit(x) sane_istest(x,GIT_DIGIT)
 877#define isalpha(x) sane_istest(x,GIT_ALPHA)
 878#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 879#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 880#define islower(x) sane_iscase(x, 1)
 881#define isupper(x) sane_iscase(x, 0)
 882#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 883#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 884#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 885#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 886                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 887#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 888#define tolower(x) sane_case((unsigned char)(x), 0x20)
 889#define toupper(x) sane_case((unsigned char)(x), 0)
 890#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 891
 892static inline int sane_case(int x, int high)
 893{
 894        if (sane_istest(x, GIT_ALPHA))
 895                x = (x & ~0x20) | high;
 896        return x;
 897}
 898
 899static inline int sane_iscase(int x, int is_lower)
 900{
 901        if (!sane_istest(x, GIT_ALPHA))
 902                return 0;
 903
 904        if (is_lower)
 905                return (x & 0x20) != 0;
 906        else
 907                return (x & 0x20) == 0;
 908}
 909
 910static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 911{
 912        unsigned long ul;
 913        char *p;
 914
 915        errno = 0;
 916        /* negative values would be accepted by strtoul */
 917        if (strchr(s, '-'))
 918                return -1;
 919        ul = strtoul(s, &p, base);
 920        if (errno || *p || p == s || (unsigned int) ul != ul)
 921                return -1;
 922        *result = ul;
 923        return 0;
 924}
 925
 926static inline int strtol_i(char const *s, int base, int *result)
 927{
 928        long ul;
 929        char *p;
 930
 931        errno = 0;
 932        ul = strtol(s, &p, base);
 933        if (errno || *p || p == s || (int) ul != ul)
 934                return -1;
 935        *result = ul;
 936        return 0;
 937}
 938
 939#ifdef INTERNAL_QSORT
 940void git_qsort(void *base, size_t nmemb, size_t size,
 941               int(*compar)(const void *, const void *));
 942#define qsort git_qsort
 943#endif
 944
 945#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 946# define FORCE_DIR_SET_GID S_ISGID
 947#else
 948# define FORCE_DIR_SET_GID 0
 949#endif
 950
 951#ifdef NO_NSEC
 952#undef USE_NSEC
 953#define ST_CTIME_NSEC(st) 0
 954#define ST_MTIME_NSEC(st) 0
 955#else
 956#ifdef USE_ST_TIMESPEC
 957#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 958#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 959#else
 960#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 961#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 962#endif
 963#endif
 964
 965#ifdef UNRELIABLE_FSTAT
 966#define fstat_is_reliable() 0
 967#else
 968#define fstat_is_reliable() 1
 969#endif
 970
 971#ifndef va_copy
 972/*
 973 * Since an obvious implementation of va_list would be to make it a
 974 * pointer into the stack frame, a simple assignment will work on
 975 * many systems.  But let's try to be more portable.
 976 */
 977#ifdef __va_copy
 978#define va_copy(dst, src) __va_copy(dst, src)
 979#else
 980#define va_copy(dst, src) ((dst) = (src))
 981#endif
 982#endif
 983
 984#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 985#define HAVE_VARIADIC_MACROS 1
 986#endif
 987
 988/*
 989 * Preserves errno, prints a message, but gives no warning for ENOENT.
 990 * Returns 0 on success, which includes trying to unlink an object that does
 991 * not exist.
 992 */
 993int unlink_or_warn(const char *path);
 994 /*
 995  * Tries to unlink file.  Returns 0 if unlink succeeded
 996  * or the file already didn't exist.  Returns -1 and
 997  * appends a message to err suitable for
 998  * 'error("%s", err->buf)' on error.
 999  */
1000int unlink_or_msg(const char *file, struct strbuf *err);
1001/*
1002 * Preserves errno, prints a message, but gives no warning for ENOENT.
1003 * Returns 0 on success, which includes trying to remove a directory that does
1004 * not exist.
1005 */
1006int rmdir_or_warn(const char *path);
1007/*
1008 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1009 * the supplied file mode.
1010 */
1011int remove_or_warn(unsigned int mode, const char *path);
1012
1013/*
1014 * Call access(2), but warn for any error except "missing file"
1015 * (ENOENT or ENOTDIR).
1016 */
1017#define ACCESS_EACCES_OK (1U << 0)
1018int access_or_warn(const char *path, int mode, unsigned flag);
1019int access_or_die(const char *path, int mode, unsigned flag);
1020
1021/* Warn on an inaccessible file that ought to be accessible */
1022void warn_on_inaccessible(const char *path);
1023
1024#ifdef GMTIME_UNRELIABLE_ERRORS
1025struct tm *git_gmtime(const time_t *);
1026struct tm *git_gmtime_r(const time_t *, struct tm *);
1027#define gmtime git_gmtime
1028#define gmtime_r git_gmtime_r
1029#endif
1030
1031#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1032#define USE_PARENS_AROUND_GETTEXT_N 1
1033#endif
1034
1035#ifndef SHELL_PATH
1036# define SHELL_PATH "/bin/sh"
1037#endif
1038
1039#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1040#define flockfile(fh)
1041#define funlockfile(fh)
1042#define getc_unlocked(fh) getc(fh)
1043#endif
1044
1045#endif