Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit Update sample pre-commit hook to use "diff --check" (03e2b63)
   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
 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
 243extern char *xstrdup(const char *str);
 244extern void *xmalloc(size_t size);
 245extern void *xmemdupz(const void *data, size_t len);
 246extern char *xstrndup(const char *str, size_t len);
 247extern void *xrealloc(void *ptr, size_t size);
 248extern void *xcalloc(size_t nmemb, size_t size);
 249extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 250extern ssize_t xread(int fd, void *buf, size_t len);
 251extern ssize_t xwrite(int fd, const void *buf, size_t len);
 252extern int xdup(int fd);
 253extern FILE *xfdopen(int fd, const char *mode);
 254extern int xmkstemp(char *template);
 255
 256static inline size_t xsize_t(off_t len)
 257{
 258        return (size_t)len;
 259}
 260
 261static inline int has_extension(const char *filename, const char *ext)
 262{
 263        size_t len = strlen(filename);
 264        size_t extlen = strlen(ext);
 265        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 266}
 267
 268/* Sane ctype - no locale, and works with signed chars */
 269#undef isspace
 270#undef isdigit
 271#undef isalpha
 272#undef isalnum
 273#undef tolower
 274#undef toupper
 275extern unsigned char sane_ctype[256];
 276#define GIT_SPACE 0x01
 277#define GIT_DIGIT 0x02
 278#define GIT_ALPHA 0x04
 279#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 280#define isspace(x) sane_istest(x,GIT_SPACE)
 281#define isdigit(x) sane_istest(x,GIT_DIGIT)
 282#define isalpha(x) sane_istest(x,GIT_ALPHA)
 283#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 284#define tolower(x) sane_case((unsigned char)(x), 0x20)
 285#define toupper(x) sane_case((unsigned char)(x), 0)
 286
 287static inline int sane_case(int x, int high)
 288{
 289        if (sane_istest(x, GIT_ALPHA))
 290                x = (x & ~0x20) | high;
 291        return x;
 292}
 293
 294static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 295{
 296        unsigned long ul;
 297        char *p;
 298
 299        errno = 0;
 300        ul = strtoul(s, &p, base);
 301        if (errno || *p || p == s || (unsigned int) ul != ul)
 302                return -1;
 303        *result = ul;
 304        return 0;
 305}
 306
 307static inline int strtol_i(char const *s, int base, int *result)
 308{
 309        long ul;
 310        char *p;
 311
 312        errno = 0;
 313        ul = strtol(s, &p, base);
 314        if (errno || *p || p == s || (int) ul != ul)
 315                return -1;
 316        *result = ul;
 317        return 0;
 318}
 319
 320#ifdef INTERNAL_QSORT
 321void git_qsort(void *base, size_t nmemb, size_t size,
 322               int(*compar)(const void *, const void *));
 323#define qsort git_qsort
 324#endif
 325
 326#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 327# define FORCE_DIR_SET_GID S_ISGID
 328#else
 329# define FORCE_DIR_SET_GID 0
 330#endif
 331
 332#endif