git-compat-util.h

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