Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit "git diff <tree>{3,}": do not reverse order of arguments (dbc2fb6)
   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 PRIu32
 114#define PRIu32 "u"
 115#endif
 116
 117#ifndef PRIx32
 118#define PRIx32 "x"
 119#endif
 120
 121#ifndef PATH_SEP
 122#define PATH_SEP ':'
 123#endif
 124
 125#ifndef STRIP_EXTENSION
 126#define STRIP_EXTENSION ""
 127#endif
 128
 129#ifndef has_dos_drive_prefix
 130#define has_dos_drive_prefix(path) 0
 131#endif
 132
 133#ifndef is_dir_sep
 134#define is_dir_sep(c) ((c) == '/')
 135#endif
 136
 137#ifdef __GNUC__
 138#define NORETURN __attribute__((__noreturn__))
 139#else
 140#define NORETURN
 141#ifndef __attribute__
 142#define __attribute__(x)
 143#endif
 144#endif
 145
 146/* General helper functions */
 147extern void usage(const char *err) NORETURN;
 148extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 149extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 150extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 151
 152extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
 153extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
 154extern void set_error_routine(void (*routine)(const char *err, va_list params));
 155extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 156
 157extern int prefixcmp(const char *str, const char *prefix);
 158extern time_t tm_to_time_t(const struct tm *tm);
 159
 160static inline const char *skip_prefix(const char *str, const char *prefix)
 161{
 162        size_t len = strlen(prefix);
 163        return strncmp(str, prefix, len) ? NULL : str + len;
 164}
 165
 166#ifdef NO_MMAP
 167
 168#ifndef PROT_READ
 169#define PROT_READ 1
 170#define PROT_WRITE 2
 171#define MAP_PRIVATE 1
 172#define MAP_FAILED ((void*)-1)
 173#endif
 174
 175#define mmap git_mmap
 176#define munmap git_munmap
 177extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 178extern int git_munmap(void *start, size_t length);
 179
 180/* This value must be multiple of (pagesize * 2) */
 181#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 182
 183#else /* NO_MMAP */
 184
 185#include <sys/mman.h>
 186
 187/* This value must be multiple of (pagesize * 2) */
 188#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 189        (sizeof(void*) >= 8 \
 190                ?  1 * 1024 * 1024 * 1024 \
 191                : 32 * 1024 * 1024)
 192
 193#endif /* NO_MMAP */
 194
 195#define DEFAULT_PACKED_GIT_LIMIT \
 196        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 197
 198#ifdef NO_PREAD
 199#define pread git_pread
 200extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 201#endif
 202/*
 203 * Forward decl that will remind us if its twin in cache.h changes.
 204 * This function is used in compat/pread.c.  But we can't include
 205 * cache.h there.
 206 */
 207extern ssize_t read_in_full(int fd, void *buf, size_t count);
 208
 209#ifdef NO_SETENV
 210#define setenv gitsetenv
 211extern int gitsetenv(const char *, const char *, int);
 212#endif
 213
 214#ifdef NO_MKDTEMP
 215#define mkdtemp gitmkdtemp
 216extern char *gitmkdtemp(char *);
 217#endif
 218
 219#ifdef NO_UNSETENV
 220#define unsetenv gitunsetenv
 221extern void gitunsetenv(const char *);
 222#endif
 223
 224#ifdef NO_STRCASESTR
 225#define strcasestr gitstrcasestr
 226extern char *gitstrcasestr(const char *haystack, const char *needle);
 227#endif
 228
 229#ifdef NO_STRLCPY
 230#define strlcpy gitstrlcpy
 231extern size_t gitstrlcpy(char *, const char *, size_t);
 232#endif
 233
 234#ifdef NO_STRTOUMAX
 235#define strtoumax gitstrtoumax
 236extern uintmax_t gitstrtoumax(const char *, char **, int);
 237#endif
 238
 239#ifdef NO_HSTRERROR
 240#define hstrerror githstrerror
 241extern const char *githstrerror(int herror);
 242#endif
 243
 244#ifdef NO_MEMMEM
 245#define memmem gitmemmem
 246void *gitmemmem(const void *haystack, size_t haystacklen,
 247                const void *needle, size_t needlelen);
 248#endif
 249
 250#ifdef FREAD_READS_DIRECTORIES
 251#ifdef fopen
 252#undef fopen
 253#endif
 254#define fopen(a,b) git_fopen(a,b)
 255extern FILE *git_fopen(const char*, const char*);
 256#endif
 257
 258#ifdef SNPRINTF_RETURNS_BOGUS
 259#define snprintf git_snprintf
 260extern int git_snprintf(char *str, size_t maxsize,
 261                        const char *format, ...);
 262#define vsnprintf git_vsnprintf
 263extern int git_vsnprintf(char *str, size_t maxsize,
 264                         const char *format, va_list ap);
 265#endif
 266
 267#ifdef __GLIBC_PREREQ
 268#if __GLIBC_PREREQ(2, 1)
 269#define HAVE_STRCHRNUL
 270#endif
 271#endif
 272
 273#ifndef HAVE_STRCHRNUL
 274#define strchrnul gitstrchrnul
 275static inline char *gitstrchrnul(const char *s, int c)
 276{
 277        while (*s && *s != c)
 278                s++;
 279        return (char *)s;
 280}
 281#endif
 282
 283extern void release_pack_memory(size_t, int);
 284
 285extern char *xstrdup(const char *str);
 286extern void *xmalloc(size_t size);
 287extern void *xmemdupz(const void *data, size_t len);
 288extern char *xstrndup(const char *str, size_t len);
 289extern void *xrealloc(void *ptr, size_t size);
 290extern void *xcalloc(size_t nmemb, size_t size);
 291extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 292extern ssize_t xread(int fd, void *buf, size_t len);
 293extern ssize_t xwrite(int fd, const void *buf, size_t len);
 294extern int xdup(int fd);
 295extern FILE *xfdopen(int fd, const char *mode);
 296extern int xmkstemp(char *template);
 297
 298static inline size_t xsize_t(off_t len)
 299{
 300        return (size_t)len;
 301}
 302
 303static inline int has_extension(const char *filename, const char *ext)
 304{
 305        size_t len = strlen(filename);
 306        size_t extlen = strlen(ext);
 307        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 308}
 309
 310/* Sane ctype - no locale, and works with signed chars */
 311#undef isspace
 312#undef isdigit
 313#undef isalpha
 314#undef isalnum
 315#undef tolower
 316#undef toupper
 317extern unsigned char sane_ctype[256];
 318#define GIT_SPACE 0x01
 319#define GIT_DIGIT 0x02
 320#define GIT_ALPHA 0x04
 321#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 322#define isspace(x) sane_istest(x,GIT_SPACE)
 323#define isdigit(x) sane_istest(x,GIT_DIGIT)
 324#define isalpha(x) sane_istest(x,GIT_ALPHA)
 325#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 326#define tolower(x) sane_case((unsigned char)(x), 0x20)
 327#define toupper(x) sane_case((unsigned char)(x), 0)
 328
 329static inline int sane_case(int x, int high)
 330{
 331        if (sane_istest(x, GIT_ALPHA))
 332                x = (x & ~0x20) | high;
 333        return x;
 334}
 335
 336static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 337{
 338        unsigned long ul;
 339        char *p;
 340
 341        errno = 0;
 342        ul = strtoul(s, &p, base);
 343        if (errno || *p || p == s || (unsigned int) ul != ul)
 344                return -1;
 345        *result = ul;
 346        return 0;
 347}
 348
 349static inline int strtol_i(char const *s, int base, int *result)
 350{
 351        long ul;
 352        char *p;
 353
 354        errno = 0;
 355        ul = strtol(s, &p, base);
 356        if (errno || *p || p == s || (int) ul != ul)
 357                return -1;
 358        *result = ul;
 359        return 0;
 360}
 361
 362#ifdef INTERNAL_QSORT
 363void git_qsort(void *base, size_t nmemb, size_t size,
 364               int(*compar)(const void *, const void *));
 365#define qsort git_qsort
 366#endif
 367
 368#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 369# define FORCE_DIR_SET_GID S_ISGID
 370#else
 371# define FORCE_DIR_SET_GID 0
 372#endif
 373
 374#endif