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__)  && !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 <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
 130static inline const char *skip_prefix(const char *str, const char *prefix)
 131{
 132        size_t len = strlen(prefix);
 133        return strncmp(str, prefix, len) ? NULL : str + len;
 134}
 135
 136#ifdef NO_MMAP
 137
 138#ifndef PROT_READ
 139#define PROT_READ 1
 140#define PROT_WRITE 2
 141#define MAP_PRIVATE 1
 142#define MAP_FAILED ((void*)-1)
 143#endif
 144
 145#define mmap git_mmap
 146#define munmap git_munmap
 147extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 148extern int git_munmap(void *start, size_t length);
 149
 150/* This value must be multiple of (pagesize * 2) */
 151#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 152
 153#else /* NO_MMAP */
 154
 155#include <sys/mman.h>
 156
 157/* This value must be multiple of (pagesize * 2) */
 158#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 159        (sizeof(void*) >= 8 \
 160                ?  1 * 1024 * 1024 * 1024 \
 161                : 32 * 1024 * 1024)
 162
 163#endif /* NO_MMAP */
 164
 165#define DEFAULT_PACKED_GIT_LIMIT \
 166        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 167
 168#ifdef NO_PREAD
 169#define pread git_pread
 170extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 171#endif
 172
 173#ifdef NO_SETENV
 174#define setenv gitsetenv
 175extern int gitsetenv(const char *, const char *, int);
 176#endif
 177
 178#ifdef NO_MKDTEMP
 179#define mkdtemp gitmkdtemp
 180extern char *gitmkdtemp(char *);
 181#endif
 182
 183#ifdef NO_UNSETENV
 184#define unsetenv gitunsetenv
 185extern void gitunsetenv(const char *);
 186#endif
 187
 188#ifdef NO_STRCASESTR
 189#define strcasestr gitstrcasestr
 190extern char *gitstrcasestr(const char *haystack, const char *needle);
 191#endif
 192
 193#ifdef NO_STRLCPY
 194#define strlcpy gitstrlcpy
 195extern size_t gitstrlcpy(char *, const char *, size_t);
 196#endif
 197
 198#ifdef NO_STRTOUMAX
 199#define strtoumax gitstrtoumax
 200extern uintmax_t gitstrtoumax(const char *, char **, int);
 201#endif
 202
 203#ifdef NO_HSTRERROR
 204#define hstrerror githstrerror
 205extern const char *githstrerror(int herror);
 206#endif
 207
 208#ifdef NO_MEMMEM
 209#define memmem gitmemmem
 210void *gitmemmem(const void *haystack, size_t haystacklen,
 211                const void *needle, size_t needlelen);
 212#endif
 213
 214#ifdef FREAD_READS_DIRECTORIES
 215#ifdef fopen
 216#undef fopen
 217#endif
 218#define fopen(a,b) git_fopen(a,b)
 219extern FILE *git_fopen(const char*, const char*);
 220#endif
 221
 222#ifdef SNPRINTF_RETURNS_BOGUS
 223#define snprintf git_snprintf
 224extern int git_snprintf(char *str, size_t maxsize,
 225                        const char *format, ...);
 226#define vsnprintf git_vsnprintf
 227extern int git_vsnprintf(char *str, size_t maxsize,
 228                         const char *format, va_list ap);
 229#endif
 230
 231#ifdef __GLIBC_PREREQ
 232#if __GLIBC_PREREQ(2, 1)
 233#define HAVE_STRCHRNUL
 234#endif
 235#endif
 236
 237#ifndef HAVE_STRCHRNUL
 238#define strchrnul gitstrchrnul
 239static inline char *gitstrchrnul(const char *s, int c)
 240{
 241        while (*s && *s != c)
 242                s++;
 243        return (char *)s;
 244}
 245#endif
 246
 247extern void release_pack_memory(size_t, int);
 248
 249extern char *xstrdup(const char *str);
 250extern void *xmalloc(size_t size);
 251extern void *xmemdupz(const void *data, size_t len);
 252extern char *xstrndup(const char *str, size_t len);
 253extern void *xrealloc(void *ptr, size_t size);
 254extern void *xcalloc(size_t nmemb, size_t size);
 255extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 256extern ssize_t xread(int fd, void *buf, size_t len);
 257extern ssize_t xwrite(int fd, const void *buf, size_t len);
 258extern int xdup(int fd);
 259extern FILE *xfdopen(int fd, const char *mode);
 260extern int xmkstemp(char *template);
 261
 262static inline size_t xsize_t(off_t len)
 263{
 264        return (size_t)len;
 265}
 266
 267static inline int has_extension(const char *filename, const char *ext)
 268{
 269        size_t len = strlen(filename);
 270        size_t extlen = strlen(ext);
 271        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 272}
 273
 274/* Sane ctype - no locale, and works with signed chars */
 275#undef isspace
 276#undef isdigit
 277#undef isalpha
 278#undef isalnum
 279#undef tolower
 280#undef toupper
 281extern unsigned char sane_ctype[256];
 282#define GIT_SPACE 0x01
 283#define GIT_DIGIT 0x02
 284#define GIT_ALPHA 0x04
 285#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 286#define isspace(x) sane_istest(x,GIT_SPACE)
 287#define isdigit(x) sane_istest(x,GIT_DIGIT)
 288#define isalpha(x) sane_istest(x,GIT_ALPHA)
 289#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 290#define tolower(x) sane_case((unsigned char)(x), 0x20)
 291#define toupper(x) sane_case((unsigned char)(x), 0)
 292
 293static inline int sane_case(int x, int high)
 294{
 295        if (sane_istest(x, GIT_ALPHA))
 296                x = (x & ~0x20) | high;
 297        return x;
 298}
 299
 300static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 301{
 302        unsigned long ul;
 303        char *p;
 304
 305        errno = 0;
 306        ul = strtoul(s, &p, base);
 307        if (errno || *p || p == s || (unsigned int) ul != ul)
 308                return -1;
 309        *result = ul;
 310        return 0;
 311}
 312
 313static inline int strtol_i(char const *s, int base, int *result)
 314{
 315        long ul;
 316        char *p;
 317
 318        errno = 0;
 319        ul = strtol(s, &p, base);
 320        if (errno || *p || p == s || (int) ul != ul)
 321                return -1;
 322        *result = ul;
 323        return 0;
 324}
 325
 326#ifdef INTERNAL_QSORT
 327void git_qsort(void *base, size_t nmemb, size_t size,
 328               int(*compar)(const void *, const void *));
 329#define qsort git_qsort
 330#endif
 331
 332#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 333# define FORCE_DIR_SET_GID S_ISGID
 334#else
 335# define FORCE_DIR_SET_GID 0
 336#endif
 337
 338#endif