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#include <utime.h>
  72#ifndef NO_SYS_SELECT_H
  73#include <sys/select.h>
  74#endif
  75#include <assert.h>
  76#include <regex.h>
  77#include <netinet/in.h>
  78#include <netinet/tcp.h>
  79#include <arpa/inet.h>
  80#include <netdb.h>
  81#include <pwd.h>
  82#include <inttypes.h>
  83#if defined(__CYGWIN__)
  84#undef _XOPEN_SOURCE
  85#include <grp.h>
  86#define _XOPEN_SOURCE 600
  87#else
  88#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
  89#include <grp.h>
  90#define _ALL_SOURCE 1
  91#endif
  92
  93#ifndef NO_ICONV
  94#include <iconv.h>
  95#endif
  96
  97/* On most systems <limits.h> would have given us this, but
  98 * not on some systems (e.g. GNU/Hurd).
  99 */
 100#ifndef PATH_MAX
 101#define PATH_MAX 4096
 102#endif
 103
 104#ifndef PRIuMAX
 105#define PRIuMAX "llu"
 106#endif
 107
 108#ifdef __GNUC__
 109#define NORETURN __attribute__((__noreturn__))
 110#else
 111#define NORETURN
 112#ifndef __attribute__
 113#define __attribute__(x)
 114#endif
 115#endif
 116
 117/* General helper functions */
 118extern void usage(const char *err) NORETURN;
 119extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 120extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 121extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 122
 123extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 124extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 125extern void set_error_routine(void (*routine)(const char *err, va_list params));
 126extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 127
 128extern int prefixcmp(const char *str, const char *prefix);
 129
 130#ifdef NO_MMAP
 131
 132#ifndef PROT_READ
 133#define PROT_READ 1
 134#define PROT_WRITE 2
 135#define MAP_PRIVATE 1
 136#define MAP_FAILED ((void*)-1)
 137#endif
 138
 139#define mmap git_mmap
 140#define munmap git_munmap
 141extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 142extern int git_munmap(void *start, size_t length);
 143
 144/* This value must be multiple of (pagesize * 2) */
 145#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 146
 147#else /* NO_MMAP */
 148
 149#include <sys/mman.h>
 150
 151/* This value must be multiple of (pagesize * 2) */
 152#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 153        (sizeof(void*) >= 8 \
 154                ?  1 * 1024 * 1024 * 1024 \
 155                : 32 * 1024 * 1024)
 156
 157#endif /* NO_MMAP */
 158
 159#define DEFAULT_PACKED_GIT_LIMIT \
 160        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 161
 162#ifdef NO_PREAD
 163#define pread git_pread
 164extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 165#endif
 166
 167#ifdef NO_SETENV
 168#define setenv gitsetenv
 169extern int gitsetenv(const char *, const char *, int);
 170#endif
 171
 172#ifdef NO_MKDTEMP
 173#define mkdtemp gitmkdtemp
 174extern char *gitmkdtemp(char *);
 175#endif
 176
 177#ifdef NO_UNSETENV
 178#define unsetenv gitunsetenv
 179extern void gitunsetenv(const char *);
 180#endif
 181
 182#ifdef NO_STRCASESTR
 183#define strcasestr gitstrcasestr
 184extern char *gitstrcasestr(const char *haystack, const char *needle);
 185#endif
 186
 187#ifdef NO_STRLCPY
 188#define strlcpy gitstrlcpy
 189extern size_t gitstrlcpy(char *, const char *, size_t);
 190#endif
 191
 192#ifdef NO_STRTOUMAX
 193#define strtoumax gitstrtoumax
 194extern uintmax_t gitstrtoumax(const char *, char **, int);
 195#endif
 196
 197#ifdef NO_HSTRERROR
 198#define hstrerror githstrerror
 199extern const char *githstrerror(int herror);
 200#endif
 201
 202#ifdef NO_MEMMEM
 203#define memmem gitmemmem
 204void *gitmemmem(const void *haystack, size_t haystacklen,
 205                const void *needle, size_t needlelen);
 206#endif
 207
 208#ifdef FREAD_READS_DIRECTORIES
 209#ifdef fopen
 210#undef fopen
 211#endif
 212#define fopen(a,b) git_fopen(a,b)
 213extern FILE *git_fopen(const char*, const char*);
 214#endif
 215
 216#ifdef SNPRINTF_RETURNS_BOGUS
 217#define snprintf git_snprintf
 218extern int git_snprintf(char *str, size_t maxsize,
 219                        const char *format, ...);
 220#define vsnprintf git_vsnprintf
 221extern int git_vsnprintf(char *str, size_t maxsize,
 222                         const char *format, va_list ap);
 223#endif
 224
 225#ifdef __GLIBC_PREREQ
 226#if __GLIBC_PREREQ(2, 1)
 227#define HAVE_STRCHRNUL
 228#endif
 229#endif
 230
 231#ifndef HAVE_STRCHRNUL
 232#define strchrnul gitstrchrnul
 233static inline char *gitstrchrnul(const char *s, int c)
 234{
 235        while (*s && *s != c)
 236                s++;
 237        return (char *)s;
 238}
 239#endif
 240
 241extern void release_pack_memory(size_t, int);
 242
 243static inline char* xstrdup(const char *str)
 244{
 245        char *ret = strdup(str);
 246        if (!ret) {
 247                release_pack_memory(strlen(str) + 1, -1);
 248                ret = strdup(str);
 249                if (!ret)
 250                        die("Out of memory, strdup failed");
 251        }
 252        return ret;
 253}
 254
 255static inline void *xmalloc(size_t size)
 256{
 257        void *ret = malloc(size);
 258        if (!ret && !size)
 259                ret = malloc(1);
 260        if (!ret) {
 261                release_pack_memory(size, -1);
 262                ret = malloc(size);
 263                if (!ret && !size)
 264                        ret = malloc(1);
 265                if (!ret)
 266                        die("Out of memory, malloc failed");
 267        }
 268#ifdef XMALLOC_POISON
 269        memset(ret, 0xA5, size);
 270#endif
 271        return ret;
 272}
 273
 274/*
 275 * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
 276 * "data" to the allocated memory, zero terminates the allocated memory,
 277 * and returns a pointer to the allocated memory. If the allocation fails,
 278 * the program dies.
 279 */
 280static inline void *xmemdupz(const void *data, size_t len)
 281{
 282        char *p = xmalloc(len + 1);
 283        memcpy(p, data, len);
 284        p[len] = '\0';
 285        return p;
 286}
 287
 288static inline char *xstrndup(const char *str, size_t len)
 289{
 290        char *p = memchr(str, '\0', len);
 291        return xmemdupz(str, p ? p - str : len);
 292}
 293
 294static inline void *xrealloc(void *ptr, size_t size)
 295{
 296        void *ret = realloc(ptr, size);
 297        if (!ret && !size)
 298                ret = realloc(ptr, 1);
 299        if (!ret) {
 300                release_pack_memory(size, -1);
 301                ret = realloc(ptr, size);
 302                if (!ret && !size)
 303                        ret = realloc(ptr, 1);
 304                if (!ret)
 305                        die("Out of memory, realloc failed");
 306        }
 307        return ret;
 308}
 309
 310static inline void *xcalloc(size_t nmemb, size_t size)
 311{
 312        void *ret = calloc(nmemb, size);
 313        if (!ret && (!nmemb || !size))
 314                ret = calloc(1, 1);
 315        if (!ret) {
 316                release_pack_memory(nmemb * size, -1);
 317                ret = calloc(nmemb, size);
 318                if (!ret && (!nmemb || !size))
 319                        ret = calloc(1, 1);
 320                if (!ret)
 321                        die("Out of memory, calloc failed");
 322        }
 323        return ret;
 324}
 325
 326static inline void *xmmap(void *start, size_t length,
 327        int prot, int flags, int fd, off_t offset)
 328{
 329        void *ret = mmap(start, length, prot, flags, fd, offset);
 330        if (ret == MAP_FAILED) {
 331                if (!length)
 332                        return NULL;
 333                release_pack_memory(length, fd);
 334                ret = mmap(start, length, prot, flags, fd, offset);
 335                if (ret == MAP_FAILED)
 336                        die("Out of memory? mmap failed: %s", strerror(errno));
 337        }
 338        return ret;
 339}
 340
 341/*
 342 * xread() is the same a read(), but it automatically restarts read()
 343 * operations with a recoverable error (EAGAIN and EINTR). xread()
 344 * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 345 */
 346static inline ssize_t xread(int fd, void *buf, size_t len)
 347{
 348        ssize_t nr;
 349        while (1) {
 350                nr = read(fd, buf, len);
 351                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 352                        continue;
 353                return nr;
 354        }
 355}
 356
 357/*
 358 * xwrite() is the same a write(), but it automatically restarts write()
 359 * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
 360 * GUARANTEE that "len" bytes is written even if the operation is successful.
 361 */
 362static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 363{
 364        ssize_t nr;
 365        while (1) {
 366                nr = write(fd, buf, len);
 367                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 368                        continue;
 369                return nr;
 370        }
 371}
 372
 373static inline int xdup(int fd)
 374{
 375        int ret = dup(fd);
 376        if (ret < 0)
 377                die("dup failed: %s", strerror(errno));
 378        return ret;
 379}
 380
 381static inline FILE *xfdopen(int fd, const char *mode)
 382{
 383        FILE *stream = fdopen(fd, mode);
 384        if (stream == NULL)
 385                die("Out of memory? fdopen failed: %s", strerror(errno));
 386        return stream;
 387}
 388
 389static inline int xmkstemp(char *template)
 390{
 391        int fd;
 392
 393        fd = mkstemp(template);
 394        if (fd < 0)
 395                die("Unable to create temporary file: %s", strerror(errno));
 396        return fd;
 397}
 398
 399static inline size_t xsize_t(off_t len)
 400{
 401        return (size_t)len;
 402}
 403
 404static inline int has_extension(const char *filename, const char *ext)
 405{
 406        size_t len = strlen(filename);
 407        size_t extlen = strlen(ext);
 408        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 409}
 410
 411/* Sane ctype - no locale, and works with signed chars */
 412#undef isspace
 413#undef isdigit
 414#undef isalpha
 415#undef isalnum
 416#undef tolower
 417#undef toupper
 418extern unsigned char sane_ctype[256];
 419#define GIT_SPACE 0x01
 420#define GIT_DIGIT 0x02
 421#define GIT_ALPHA 0x04
 422#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 423#define isspace(x) sane_istest(x,GIT_SPACE)
 424#define isdigit(x) sane_istest(x,GIT_DIGIT)
 425#define isalpha(x) sane_istest(x,GIT_ALPHA)
 426#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 427#define tolower(x) sane_case((unsigned char)(x), 0x20)
 428#define toupper(x) sane_case((unsigned char)(x), 0)
 429
 430static inline int sane_case(int x, int high)
 431{
 432        if (sane_istest(x, GIT_ALPHA))
 433                x = (x & ~0x20) | high;
 434        return x;
 435}
 436
 437static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 438{
 439        unsigned long ul;
 440        char *p;
 441
 442        errno = 0;
 443        ul = strtoul(s, &p, base);
 444        if (errno || *p || p == s || (unsigned int) ul != ul)
 445                return -1;
 446        *result = ul;
 447        return 0;
 448}
 449
 450static inline int strtol_i(char const *s, int base, int *result)
 451{
 452        long ul;
 453        char *p;
 454
 455        errno = 0;
 456        ul = strtol(s, &p, base);
 457        if (errno || *p || p == s || (int) ul != ul)
 458                return -1;
 459        *result = ul;
 460        return 0;
 461}
 462
 463#ifdef INTERNAL_QSORT
 464void git_qsort(void *base, size_t nmemb, size_t size,
 465               int(*compar)(const void *, const void *));
 466#define qsort git_qsort
 467#endif
 468
 469#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 470# define FORCE_DIR_SET_GID S_ISGID
 471#else
 472# define FORCE_DIR_SET_GID 0
 473#endif
 474
 475#endif