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__)
  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 <sys/wait.h>
  67#include <fnmatch.h>
  68#include <sys/poll.h>
  69#include <sys/socket.h>
  70#include <sys/ioctl.h>
  71#ifndef NO_SYS_SELECT_H
  72#include <sys/select.h>
  73#endif
  74#include <assert.h>
  75#include <regex.h>
  76#include <netinet/in.h>
  77#include <netinet/tcp.h>
  78#include <arpa/inet.h>
  79#include <netdb.h>
  80#include <pwd.h>
  81#include <inttypes.h>
  82#if defined(__CYGWIN__)
  83#undef _XOPEN_SOURCE
  84#include <grp.h>
  85#define _XOPEN_SOURCE 600
  86#else
  87#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  88#include <grp.h>
  89#define _ALL_SOURCE 1
  90#endif
  91
  92#ifndef NO_ICONV
  93#include <iconv.h>
  94#endif
  95
  96/* On most systems <limits.h> would have given us this, but
  97 * not on some systems (e.g. GNU/Hurd).
  98 */
  99#ifndef PATH_MAX
 100#define PATH_MAX 4096
 101#endif
 102
 103#ifndef PRIuMAX
 104#define PRIuMAX "llu"
 105#endif
 106
 107#ifdef __GNUC__
 108#define NORETURN __attribute__((__noreturn__))
 109#else
 110#define NORETURN
 111#ifndef __attribute__
 112#define __attribute__(x)
 113#endif
 114#endif
 115
 116/* General helper functions */
 117extern void usage(const char *err) NORETURN;
 118extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 119extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 120extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 121
 122extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 123extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 124extern void set_error_routine(void (*routine)(const char *err, va_list params));
 125extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 126
 127extern int prefixcmp(const char *str, const char *prefix);
 128
 129#ifdef NO_MMAP
 130
 131#ifndef PROT_READ
 132#define PROT_READ 1
 133#define PROT_WRITE 2
 134#define MAP_PRIVATE 1
 135#define MAP_FAILED ((void*)-1)
 136#endif
 137
 138#define mmap git_mmap
 139#define munmap git_munmap
 140extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 141extern int git_munmap(void *start, size_t length);
 142
 143/* This value must be multiple of (pagesize * 2) */
 144#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 145
 146#else /* NO_MMAP */
 147
 148#include <sys/mman.h>
 149
 150/* This value must be multiple of (pagesize * 2) */
 151#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 152        (sizeof(void*) >= 8 \
 153                ?  1 * 1024 * 1024 * 1024 \
 154                : 32 * 1024 * 1024)
 155
 156#endif /* NO_MMAP */
 157
 158#define DEFAULT_PACKED_GIT_LIMIT \
 159        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 160
 161#ifdef NO_PREAD
 162#define pread git_pread
 163extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 164#endif
 165
 166#ifdef NO_SETENV
 167#define setenv gitsetenv
 168extern int gitsetenv(const char *, const char *, int);
 169#endif
 170
 171#ifdef NO_MKDTEMP
 172#define mkdtemp gitmkdtemp
 173extern char *gitmkdtemp(char *);
 174#endif
 175
 176#ifdef NO_UNSETENV
 177#define unsetenv gitunsetenv
 178extern void gitunsetenv(const char *);
 179#endif
 180
 181#ifdef NO_STRCASESTR
 182#define strcasestr gitstrcasestr
 183extern char *gitstrcasestr(const char *haystack, const char *needle);
 184#endif
 185
 186#ifdef NO_STRLCPY
 187#define strlcpy gitstrlcpy
 188extern size_t gitstrlcpy(char *, const char *, size_t);
 189#endif
 190
 191#ifdef NO_STRTOUMAX
 192#define strtoumax gitstrtoumax
 193extern uintmax_t gitstrtoumax(const char *, char **, int);
 194#endif
 195
 196#ifdef NO_HSTRERROR
 197#define hstrerror githstrerror
 198extern const char *githstrerror(int herror);
 199#endif
 200
 201#ifdef NO_MEMMEM
 202#define memmem gitmemmem
 203void *gitmemmem(const void *haystack, size_t haystacklen,
 204                const void *needle, size_t needlelen);
 205#endif
 206
 207#ifdef FREAD_READS_DIRECTORIES
 208#define fopen(a,b) git_fopen(a,b)
 209extern FILE *git_fopen(const char*, const char*);
 210#endif
 211
 212#ifdef SNPRINTF_RETURNS_BOGUS
 213#define snprintf git_snprintf
 214extern int git_snprintf(char *str, size_t maxsize,
 215                        const char *format, ...);
 216#define vsnprintf git_vsnprintf
 217extern int git_vsnprintf(char *str, size_t maxsize,
 218                         const char *format, va_list ap);
 219#endif
 220
 221#ifdef __GLIBC_PREREQ
 222#if __GLIBC_PREREQ(2, 1)
 223#define HAVE_STRCHRNUL
 224#endif
 225#endif
 226
 227#ifndef HAVE_STRCHRNUL
 228#define strchrnul gitstrchrnul
 229static inline char *gitstrchrnul(const char *s, int c)
 230{
 231        while (*s && *s != c)
 232                s++;
 233        return (char *)s;
 234}
 235#endif
 236
 237extern void release_pack_memory(size_t, int);
 238
 239static inline char* xstrdup(const char *str)
 240{
 241        char *ret = strdup(str);
 242        if (!ret) {
 243                release_pack_memory(strlen(str) + 1, -1);
 244                ret = strdup(str);
 245                if (!ret)
 246                        die("Out of memory, strdup failed");
 247        }
 248        return ret;
 249}
 250
 251static inline void *xmalloc(size_t size)
 252{
 253        void *ret = malloc(size);
 254        if (!ret && !size)
 255                ret = malloc(1);
 256        if (!ret) {
 257                release_pack_memory(size, -1);
 258                ret = malloc(size);
 259                if (!ret && !size)
 260                        ret = malloc(1);
 261                if (!ret)
 262                        die("Out of memory, malloc failed");
 263        }
 264#ifdef XMALLOC_POISON
 265        memset(ret, 0xA5, size);
 266#endif
 267        return ret;
 268}
 269
 270static inline void *xmemdupz(const void *data, size_t len)
 271{
 272        char *p = xmalloc(len + 1);
 273        memcpy(p, data, len);
 274        p[len] = '\0';
 275        return p;
 276}
 277
 278static inline char *xstrndup(const char *str, size_t len)
 279{
 280        char *p = memchr(str, '\0', len);
 281        return xmemdupz(str, p ? p - str : len);
 282}
 283
 284static inline void *xrealloc(void *ptr, size_t size)
 285{
 286        void *ret = realloc(ptr, size);
 287        if (!ret && !size)
 288                ret = realloc(ptr, 1);
 289        if (!ret) {
 290                release_pack_memory(size, -1);
 291                ret = realloc(ptr, size);
 292                if (!ret && !size)
 293                        ret = realloc(ptr, 1);
 294                if (!ret)
 295                        die("Out of memory, realloc failed");
 296        }
 297        return ret;
 298}
 299
 300static inline void *xcalloc(size_t nmemb, size_t size)
 301{
 302        void *ret = calloc(nmemb, size);
 303        if (!ret && (!nmemb || !size))
 304                ret = calloc(1, 1);
 305        if (!ret) {
 306                release_pack_memory(nmemb * size, -1);
 307                ret = calloc(nmemb, size);
 308                if (!ret && (!nmemb || !size))
 309                        ret = calloc(1, 1);
 310                if (!ret)
 311                        die("Out of memory, calloc failed");
 312        }
 313        return ret;
 314}
 315
 316static inline void *xmmap(void *start, size_t length,
 317        int prot, int flags, int fd, off_t offset)
 318{
 319        void *ret = mmap(start, length, prot, flags, fd, offset);
 320        if (ret == MAP_FAILED) {
 321                if (!length)
 322                        return NULL;
 323                release_pack_memory(length, fd);
 324                ret = mmap(start, length, prot, flags, fd, offset);
 325                if (ret == MAP_FAILED)
 326                        die("Out of memory? mmap failed: %s", strerror(errno));
 327        }
 328        return ret;
 329}
 330
 331static inline ssize_t xread(int fd, void *buf, size_t len)
 332{
 333        ssize_t nr;
 334        while (1) {
 335                nr = read(fd, buf, len);
 336                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 337                        continue;
 338                return nr;
 339        }
 340}
 341
 342static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 343{
 344        ssize_t nr;
 345        while (1) {
 346                nr = write(fd, buf, len);
 347                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 348                        continue;
 349                return nr;
 350        }
 351}
 352
 353static inline int xdup(int fd)
 354{
 355        int ret = dup(fd);
 356        if (ret < 0)
 357                die("dup failed: %s", strerror(errno));
 358        return ret;
 359}
 360
 361static inline FILE *xfdopen(int fd, const char *mode)
 362{
 363        FILE *stream = fdopen(fd, mode);
 364        if (stream == NULL)
 365                die("Out of memory? fdopen failed: %s", strerror(errno));
 366        return stream;
 367}
 368
 369static inline int xmkstemp(char *template)
 370{
 371        int fd;
 372
 373        fd = mkstemp(template);
 374        if (fd < 0)
 375                die("Unable to create temporary file: %s", strerror(errno));
 376        return fd;
 377}
 378
 379static inline size_t xsize_t(off_t len)
 380{
 381        return (size_t)len;
 382}
 383
 384static inline int has_extension(const char *filename, const char *ext)
 385{
 386        size_t len = strlen(filename);
 387        size_t extlen = strlen(ext);
 388        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 389}
 390
 391/* Sane ctype - no locale, and works with signed chars */
 392#undef isspace
 393#undef isdigit
 394#undef isalpha
 395#undef isalnum
 396#undef tolower
 397#undef toupper
 398extern unsigned char sane_ctype[256];
 399#define GIT_SPACE 0x01
 400#define GIT_DIGIT 0x02
 401#define GIT_ALPHA 0x04
 402#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 403#define isspace(x) sane_istest(x,GIT_SPACE)
 404#define isdigit(x) sane_istest(x,GIT_DIGIT)
 405#define isalpha(x) sane_istest(x,GIT_ALPHA)
 406#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 407#define tolower(x) sane_case((unsigned char)(x), 0x20)
 408#define toupper(x) sane_case((unsigned char)(x), 0)
 409
 410static inline int sane_case(int x, int high)
 411{
 412        if (sane_istest(x, GIT_ALPHA))
 413                x = (x & ~0x20) | high;
 414        return x;
 415}
 416
 417static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 418{
 419        unsigned long ul;
 420        char *p;
 421
 422        errno = 0;
 423        ul = strtoul(s, &p, base);
 424        if (errno || *p || p == s || (unsigned int) ul != ul)
 425                return -1;
 426        *result = ul;
 427        return 0;
 428}
 429
 430static inline int strtol_i(char const *s, int base, int *result)
 431{
 432        long ul;
 433        char *p;
 434
 435        errno = 0;
 436        ul = strtol(s, &p, base);
 437        if (errno || *p || p == s || (int) ul != ul)
 438                return -1;
 439        *result = ul;
 440        return 0;
 441}
 442
 443#ifdef INTERNAL_QSORT
 444void git_qsort(void *base, size_t nmemb, size_t size,
 445               int(*compar)(const void *, const void *));
 446#define qsort git_qsort
 447#endif
 448
 449#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 450# define FORCE_DIR_SET_GID S_ISGID
 451#else
 452# define FORCE_DIR_SET_GID 0
 453#endif
 454
 455#endif