Andrew's git - gitweb.git/blob

da7249ac1cc5d3ccc69230face67ff43ee23101b
   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#else
  89#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  90#include <grp.h>
  91#define _ALL_SOURCE 1
  92#endif
  93#else   /* __MINGW32__ */
  94/* pull in Windows compatibility stuff */
  95#include "compat/mingw.h"
  96#endif  /* __MINGW32__ */
  97
  98#ifndef NO_ICONV
  99#include <iconv.h>
 100#endif
 101
 102/* On most systems <limits.h> would have given us this, but
 103 * not on some systems (e.g. GNU/Hurd).
 104 */
 105#ifndef PATH_MAX
 106#define PATH_MAX 4096
 107#endif
 108
 109#ifndef PRIuMAX
 110#define PRIuMAX "llu"
 111#endif
 112
 113#ifdef __GNUC__
 114#define NORETURN __attribute__((__noreturn__))
 115#else
 116#define NORETURN
 117#ifndef __attribute__
 118#define __attribute__(x)
 119#endif
 120#endif
 121
 122/* General helper functions */
 123extern void usage(const char *err) NORETURN;
 124extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 125extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 126extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 127
 128extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 129extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 130extern void set_error_routine(void (*routine)(const char *err, va_list params));
 131extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 132
 133extern int prefixcmp(const char *str, const char *prefix);
 134
 135#ifdef NO_MMAP
 136
 137#ifndef PROT_READ
 138#define PROT_READ 1
 139#define PROT_WRITE 2
 140#define MAP_PRIVATE 1
 141#define MAP_FAILED ((void*)-1)
 142#endif
 143
 144#define mmap git_mmap
 145#define munmap git_munmap
 146extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 147extern int git_munmap(void *start, size_t length);
 148
 149/* This value must be multiple of (pagesize * 2) */
 150#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 151
 152#else /* NO_MMAP */
 153
 154#include <sys/mman.h>
 155
 156/* This value must be multiple of (pagesize * 2) */
 157#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 158        (sizeof(void*) >= 8 \
 159                ?  1 * 1024 * 1024 * 1024 \
 160                : 32 * 1024 * 1024)
 161
 162#endif /* NO_MMAP */
 163
 164#define DEFAULT_PACKED_GIT_LIMIT \
 165        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 166
 167#ifdef NO_PREAD
 168#define pread git_pread
 169extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 170#endif
 171
 172#ifdef NO_SETENV
 173#define setenv gitsetenv
 174extern int gitsetenv(const char *, const char *, int);
 175#endif
 176
 177#ifdef NO_MKDTEMP
 178#define mkdtemp gitmkdtemp
 179extern char *gitmkdtemp(char *);
 180#endif
 181
 182#ifdef NO_UNSETENV
 183#define unsetenv gitunsetenv
 184extern void gitunsetenv(const char *);
 185#endif
 186
 187#ifdef NO_STRCASESTR
 188#define strcasestr gitstrcasestr
 189extern char *gitstrcasestr(const char *haystack, const char *needle);
 190#endif
 191
 192#ifdef NO_STRLCPY
 193#define strlcpy gitstrlcpy
 194extern size_t gitstrlcpy(char *, const char *, size_t);
 195#endif
 196
 197#ifdef NO_STRTOUMAX
 198#define strtoumax gitstrtoumax
 199extern uintmax_t gitstrtoumax(const char *, char **, int);
 200#endif
 201
 202#ifdef NO_HSTRERROR
 203#define hstrerror githstrerror
 204extern const char *githstrerror(int herror);
 205#endif
 206
 207#ifdef NO_MEMMEM
 208#define memmem gitmemmem
 209void *gitmemmem(const void *haystack, size_t haystacklen,
 210                const void *needle, size_t needlelen);
 211#endif
 212
 213#ifdef FREAD_READS_DIRECTORIES
 214#ifdef fopen
 215#undef fopen
 216#endif
 217#define fopen(a,b) git_fopen(a,b)
 218extern FILE *git_fopen(const char*, const char*);
 219#endif
 220
 221#ifdef SNPRINTF_RETURNS_BOGUS
 222#define snprintf git_snprintf
 223extern int git_snprintf(char *str, size_t maxsize,
 224                        const char *format, ...);
 225#define vsnprintf git_vsnprintf
 226extern int git_vsnprintf(char *str, size_t maxsize,
 227                         const char *format, va_list ap);
 228#endif
 229
 230#ifdef __GLIBC_PREREQ
 231#if __GLIBC_PREREQ(2, 1)
 232#define HAVE_STRCHRNUL
 233#endif
 234#endif
 235
 236#ifndef HAVE_STRCHRNUL
 237#define strchrnul gitstrchrnul
 238static inline char *gitstrchrnul(const char *s, int c)
 239{
 240        while (*s && *s != c)
 241                s++;
 242        return (char *)s;
 243}
 244#endif
 245
 246extern void release_pack_memory(size_t, int);
 247
 248static inline char* xstrdup(const char *str)
 249{
 250        char *ret = strdup(str);
 251        if (!ret) {
 252                release_pack_memory(strlen(str) + 1, -1);
 253                ret = strdup(str);
 254                if (!ret)
 255                        die("Out of memory, strdup failed");
 256        }
 257        return ret;
 258}
 259
 260static inline void *xmalloc(size_t size)
 261{
 262        void *ret = malloc(size);
 263        if (!ret && !size)
 264                ret = malloc(1);
 265        if (!ret) {
 266                release_pack_memory(size, -1);
 267                ret = malloc(size);
 268                if (!ret && !size)
 269                        ret = malloc(1);
 270                if (!ret)
 271                        die("Out of memory, malloc failed");
 272        }
 273#ifdef XMALLOC_POISON
 274        memset(ret, 0xA5, size);
 275#endif
 276        return ret;
 277}
 278
 279/*
 280 * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
 281 * "data" to the allocated memory, zero terminates the allocated memory,
 282 * and returns a pointer to the allocated memory. If the allocation fails,
 283 * the program dies.
 284 */
 285static inline void *xmemdupz(const void *data, size_t len)
 286{
 287        char *p = xmalloc(len + 1);
 288        memcpy(p, data, len);
 289        p[len] = '\0';
 290        return p;
 291}
 292
 293static inline char *xstrndup(const char *str, size_t len)
 294{
 295        char *p = memchr(str, '\0', len);
 296        return xmemdupz(str, p ? p - str : len);
 297}
 298
 299static inline void *xrealloc(void *ptr, size_t size)
 300{
 301        void *ret = realloc(ptr, size);
 302        if (!ret && !size)
 303                ret = realloc(ptr, 1);
 304        if (!ret) {
 305                release_pack_memory(size, -1);
 306                ret = realloc(ptr, size);
 307                if (!ret && !size)
 308                        ret = realloc(ptr, 1);
 309                if (!ret)
 310                        die("Out of memory, realloc failed");
 311        }
 312        return ret;
 313}
 314
 315static inline void *xcalloc(size_t nmemb, size_t size)
 316{
 317        void *ret = calloc(nmemb, size);
 318        if (!ret && (!nmemb || !size))
 319                ret = calloc(1, 1);
 320        if (!ret) {
 321                release_pack_memory(nmemb * size, -1);
 322                ret = calloc(nmemb, size);
 323                if (!ret && (!nmemb || !size))
 324                        ret = calloc(1, 1);
 325                if (!ret)
 326                        die("Out of memory, calloc failed");
 327        }
 328        return ret;
 329}
 330
 331static inline void *xmmap(void *start, size_t length,
 332        int prot, int flags, int fd, off_t offset)
 333{
 334        void *ret = mmap(start, length, prot, flags, fd, offset);
 335        if (ret == MAP_FAILED) {
 336                if (!length)
 337                        return NULL;
 338                release_pack_memory(length, fd);
 339                ret = mmap(start, length, prot, flags, fd, offset);
 340                if (ret == MAP_FAILED)
 341                        die("Out of memory? mmap failed: %s", strerror(errno));
 342        }
 343        return ret;
 344}
 345
 346/*
 347 * xread() is the same a read(), but it automatically restarts read()
 348 * operations with a recoverable error (EAGAIN and EINTR). xread()
 349 * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 350 */
 351static inline ssize_t xread(int fd, void *buf, size_t len)
 352{
 353        ssize_t nr;
 354        while (1) {
 355                nr = read(fd, buf, len);
 356                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 357                        continue;
 358                return nr;
 359        }
 360}
 361
 362/*
 363 * xwrite() is the same a write(), but it automatically restarts write()
 364 * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
 365 * GUARANTEE that "len" bytes is written even if the operation is successful.
 366 */
 367static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 368{
 369        ssize_t nr;
 370        while (1) {
 371                nr = write(fd, buf, len);
 372                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 373                        continue;
 374                return nr;
 375        }
 376}
 377
 378static inline int xdup(int fd)
 379{
 380        int ret = dup(fd);
 381        if (ret < 0)
 382                die("dup failed: %s", strerror(errno));
 383        return ret;
 384}
 385
 386static inline FILE *xfdopen(int fd, const char *mode)
 387{
 388        FILE *stream = fdopen(fd, mode);
 389        if (stream == NULL)
 390                die("Out of memory? fdopen failed: %s", strerror(errno));
 391        return stream;
 392}
 393
 394static inline int xmkstemp(char *template)
 395{
 396        int fd;
 397
 398        fd = mkstemp(template);
 399        if (fd < 0)
 400                die("Unable to create temporary file: %s", strerror(errno));
 401        return fd;
 402}
 403
 404static inline size_t xsize_t(off_t len)
 405{
 406        return (size_t)len;
 407}
 408
 409static inline int has_extension(const char *filename, const char *ext)
 410{
 411        size_t len = strlen(filename);
 412        size_t extlen = strlen(ext);
 413        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 414}
 415
 416/* Sane ctype - no locale, and works with signed chars */
 417#undef isspace
 418#undef isdigit
 419#undef isalpha
 420#undef isalnum
 421#undef tolower
 422#undef toupper
 423extern unsigned char sane_ctype[256];
 424#define GIT_SPACE 0x01
 425#define GIT_DIGIT 0x02
 426#define GIT_ALPHA 0x04
 427#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 428#define isspace(x) sane_istest(x,GIT_SPACE)
 429#define isdigit(x) sane_istest(x,GIT_DIGIT)
 430#define isalpha(x) sane_istest(x,GIT_ALPHA)
 431#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 432#define tolower(x) sane_case((unsigned char)(x), 0x20)
 433#define toupper(x) sane_case((unsigned char)(x), 0)
 434
 435static inline int sane_case(int x, int high)
 436{
 437        if (sane_istest(x, GIT_ALPHA))
 438                x = (x & ~0x20) | high;
 439        return x;
 440}
 441
 442static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 443{
 444        unsigned long ul;
 445        char *p;
 446
 447        errno = 0;
 448        ul = strtoul(s, &p, base);
 449        if (errno || *p || p == s || (unsigned int) ul != ul)
 450                return -1;
 451        *result = ul;
 452        return 0;
 453}
 454
 455static inline int strtol_i(char const *s, int base, int *result)
 456{
 457        long ul;
 458        char *p;
 459
 460        errno = 0;
 461        ul = strtol(s, &p, base);
 462        if (errno || *p || p == s || (int) ul != ul)
 463                return -1;
 464        *result = ul;
 465        return 0;
 466}
 467
 468#ifdef INTERNAL_QSORT
 469void git_qsort(void *base, size_t nmemb, size_t size,
 470               int(*compar)(const void *, const void *));
 471#define qsort git_qsort
 472#endif
 473
 474#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 475# define FORCE_DIR_SET_GID S_ISGID
 476#else
 477# define FORCE_DIR_SET_GID 0
 478#endif
 479
 480#endif