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