Andrew's git - gitweb.git/blob

9dc733e56ceb2c2e95dfc3b14c29e825b3c25615
   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#ifndef PATH_SEP
 114#define PATH_SEP ':'
 115#endif
 116
 117#ifdef __GNUC__
 118#define NORETURN __attribute__((__noreturn__))
 119#else
 120#define NORETURN
 121#ifndef __attribute__
 122#define __attribute__(x)
 123#endif
 124#endif
 125
 126/* General helper functions */
 127extern void usage(const char *err) NORETURN;
 128extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 129extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 130extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 131
 132extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 133extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 134extern void set_error_routine(void (*routine)(const char *err, va_list params));
 135extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 136
 137extern int prefixcmp(const char *str, const char *prefix);
 138
 139#ifdef NO_MMAP
 140
 141#ifndef PROT_READ
 142#define PROT_READ 1
 143#define PROT_WRITE 2
 144#define MAP_PRIVATE 1
 145#define MAP_FAILED ((void*)-1)
 146#endif
 147
 148#define mmap git_mmap
 149#define munmap git_munmap
 150extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 151extern int git_munmap(void *start, size_t length);
 152
 153/* This value must be multiple of (pagesize * 2) */
 154#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 155
 156#else /* NO_MMAP */
 157
 158#include <sys/mman.h>
 159
 160/* This value must be multiple of (pagesize * 2) */
 161#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 162        (sizeof(void*) >= 8 \
 163                ?  1 * 1024 * 1024 * 1024 \
 164                : 32 * 1024 * 1024)
 165
 166#endif /* NO_MMAP */
 167
 168#define DEFAULT_PACKED_GIT_LIMIT \
 169        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 170
 171#ifdef NO_PREAD
 172#define pread git_pread
 173extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 174#endif
 175
 176#ifdef NO_SETENV
 177#define setenv gitsetenv
 178extern int gitsetenv(const char *, const char *, int);
 179#endif
 180
 181#ifdef NO_MKDTEMP
 182#define mkdtemp gitmkdtemp
 183extern char *gitmkdtemp(char *);
 184#endif
 185
 186#ifdef NO_UNSETENV
 187#define unsetenv gitunsetenv
 188extern void gitunsetenv(const char *);
 189#endif
 190
 191#ifdef NO_STRCASESTR
 192#define strcasestr gitstrcasestr
 193extern char *gitstrcasestr(const char *haystack, const char *needle);
 194#endif
 195
 196#ifdef NO_STRLCPY
 197#define strlcpy gitstrlcpy
 198extern size_t gitstrlcpy(char *, const char *, size_t);
 199#endif
 200
 201#ifdef NO_STRTOUMAX
 202#define strtoumax gitstrtoumax
 203extern uintmax_t gitstrtoumax(const char *, char **, int);
 204#endif
 205
 206#ifdef NO_HSTRERROR
 207#define hstrerror githstrerror
 208extern const char *githstrerror(int herror);
 209#endif
 210
 211#ifdef NO_MEMMEM
 212#define memmem gitmemmem
 213void *gitmemmem(const void *haystack, size_t haystacklen,
 214                const void *needle, size_t needlelen);
 215#endif
 216
 217#ifdef FREAD_READS_DIRECTORIES
 218#ifdef fopen
 219#undef fopen
 220#endif
 221#define fopen(a,b) git_fopen(a,b)
 222extern FILE *git_fopen(const char*, const char*);
 223#endif
 224
 225#ifdef SNPRINTF_RETURNS_BOGUS
 226#define snprintf git_snprintf
 227extern int git_snprintf(char *str, size_t maxsize,
 228                        const char *format, ...);
 229#define vsnprintf git_vsnprintf
 230extern int git_vsnprintf(char *str, size_t maxsize,
 231                         const char *format, va_list ap);
 232#endif
 233
 234#ifdef __GLIBC_PREREQ
 235#if __GLIBC_PREREQ(2, 1)
 236#define HAVE_STRCHRNUL
 237#endif
 238#endif
 239
 240#ifndef HAVE_STRCHRNUL
 241#define strchrnul gitstrchrnul
 242static inline char *gitstrchrnul(const char *s, int c)
 243{
 244        while (*s && *s != c)
 245                s++;
 246        return (char *)s;
 247}
 248#endif
 249
 250extern void release_pack_memory(size_t, int);
 251
 252static inline char* xstrdup(const char *str)
 253{
 254        char *ret = strdup(str);
 255        if (!ret) {
 256                release_pack_memory(strlen(str) + 1, -1);
 257                ret = strdup(str);
 258                if (!ret)
 259                        die("Out of memory, strdup failed");
 260        }
 261        return ret;
 262}
 263
 264static inline void *xmalloc(size_t size)
 265{
 266        void *ret = malloc(size);
 267        if (!ret && !size)
 268                ret = malloc(1);
 269        if (!ret) {
 270                release_pack_memory(size, -1);
 271                ret = malloc(size);
 272                if (!ret && !size)
 273                        ret = malloc(1);
 274                if (!ret)
 275                        die("Out of memory, malloc failed");
 276        }
 277#ifdef XMALLOC_POISON
 278        memset(ret, 0xA5, size);
 279#endif
 280        return ret;
 281}
 282
 283/*
 284 * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of
 285 * "data" to the allocated memory, zero terminates the allocated memory,
 286 * and returns a pointer to the allocated memory. If the allocation fails,
 287 * the program dies.
 288 */
 289static inline void *xmemdupz(const void *data, size_t len)
 290{
 291        char *p = xmalloc(len + 1);
 292        memcpy(p, data, len);
 293        p[len] = '\0';
 294        return p;
 295}
 296
 297static inline char *xstrndup(const char *str, size_t len)
 298{
 299        char *p = memchr(str, '\0', len);
 300        return xmemdupz(str, p ? p - str : len);
 301}
 302
 303static inline void *xrealloc(void *ptr, size_t size)
 304{
 305        void *ret = realloc(ptr, size);
 306        if (!ret && !size)
 307                ret = realloc(ptr, 1);
 308        if (!ret) {
 309                release_pack_memory(size, -1);
 310                ret = realloc(ptr, size);
 311                if (!ret && !size)
 312                        ret = realloc(ptr, 1);
 313                if (!ret)
 314                        die("Out of memory, realloc failed");
 315        }
 316        return ret;
 317}
 318
 319static inline void *xcalloc(size_t nmemb, size_t size)
 320{
 321        void *ret = calloc(nmemb, size);
 322        if (!ret && (!nmemb || !size))
 323                ret = calloc(1, 1);
 324        if (!ret) {
 325                release_pack_memory(nmemb * size, -1);
 326                ret = calloc(nmemb, size);
 327                if (!ret && (!nmemb || !size))
 328                        ret = calloc(1, 1);
 329                if (!ret)
 330                        die("Out of memory, calloc failed");
 331        }
 332        return ret;
 333}
 334
 335static inline void *xmmap(void *start, size_t length,
 336        int prot, int flags, int fd, off_t offset)
 337{
 338        void *ret = mmap(start, length, prot, flags, fd, offset);
 339        if (ret == MAP_FAILED) {
 340                if (!length)
 341                        return NULL;
 342                release_pack_memory(length, fd);
 343                ret = mmap(start, length, prot, flags, fd, offset);
 344                if (ret == MAP_FAILED)
 345                        die("Out of memory? mmap failed: %s", strerror(errno));
 346        }
 347        return ret;
 348}
 349
 350/*
 351 * xread() is the same a read(), but it automatically restarts read()
 352 * operations with a recoverable error (EAGAIN and EINTR). xread()
 353 * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 354 */
 355static inline ssize_t xread(int fd, void *buf, size_t len)
 356{
 357        ssize_t nr;
 358        while (1) {
 359                nr = read(fd, buf, len);
 360                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 361                        continue;
 362                return nr;
 363        }
 364}
 365
 366/*
 367 * xwrite() is the same a write(), but it automatically restarts write()
 368 * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT
 369 * GUARANTEE that "len" bytes is written even if the operation is successful.
 370 */
 371static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 372{
 373        ssize_t nr;
 374        while (1) {
 375                nr = write(fd, buf, len);
 376                if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
 377                        continue;
 378                return nr;
 379        }
 380}
 381
 382static inline int xdup(int fd)
 383{
 384        int ret = dup(fd);
 385        if (ret < 0)
 386                die("dup failed: %s", strerror(errno));
 387        return ret;
 388}
 389
 390static inline FILE *xfdopen(int fd, const char *mode)
 391{
 392        FILE *stream = fdopen(fd, mode);
 393        if (stream == NULL)
 394                die("Out of memory? fdopen failed: %s", strerror(errno));
 395        return stream;
 396}
 397
 398static inline int xmkstemp(char *template)
 399{
 400        int fd;
 401
 402        fd = mkstemp(template);
 403        if (fd < 0)
 404                die("Unable to create temporary file: %s", strerror(errno));
 405        return fd;
 406}
 407
 408static inline size_t xsize_t(off_t len)
 409{
 410        return (size_t)len;
 411}
 412
 413static inline int has_extension(const char *filename, const char *ext)
 414{
 415        size_t len = strlen(filename);
 416        size_t extlen = strlen(ext);
 417        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 418}
 419
 420/* Sane ctype - no locale, and works with signed chars */
 421#undef isspace
 422#undef isdigit
 423#undef isalpha
 424#undef isalnum
 425#undef tolower
 426#undef toupper
 427extern unsigned char sane_ctype[256];
 428#define GIT_SPACE 0x01
 429#define GIT_DIGIT 0x02
 430#define GIT_ALPHA 0x04
 431#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 432#define isspace(x) sane_istest(x,GIT_SPACE)
 433#define isdigit(x) sane_istest(x,GIT_DIGIT)
 434#define isalpha(x) sane_istest(x,GIT_ALPHA)
 435#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 436#define tolower(x) sane_case((unsigned char)(x), 0x20)
 437#define toupper(x) sane_case((unsigned char)(x), 0)
 438
 439static inline int sane_case(int x, int high)
 440{
 441        if (sane_istest(x, GIT_ALPHA))
 442                x = (x & ~0x20) | high;
 443        return x;
 444}
 445
 446static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 447{
 448        unsigned long ul;
 449        char *p;
 450
 451        errno = 0;
 452        ul = strtoul(s, &p, base);
 453        if (errno || *p || p == s || (unsigned int) ul != ul)
 454                return -1;
 455        *result = ul;
 456        return 0;
 457}
 458
 459static inline int strtol_i(char const *s, int base, int *result)
 460{
 461        long ul;
 462        char *p;
 463
 464        errno = 0;
 465        ul = strtol(s, &p, base);
 466        if (errno || *p || p == s || (int) ul != ul)
 467                return -1;
 468        *result = ul;
 469        return 0;
 470}
 471
 472#ifdef INTERNAL_QSORT
 473void git_qsort(void *base, size_t nmemb, size_t size,
 474               int(*compar)(const void *, const void *));
 475#define qsort git_qsort
 476#endif
 477
 478#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 479# define FORCE_DIR_SET_GID S_ISGID
 480#else
 481# define FORCE_DIR_SET_GID 0
 482#endif
 483
 484#endif