cache.h

   1 #ifndef CACHE_H
   2 #define CACHE_H
   3
   4 #include "git-compat-util.h"
   5
   6 #include SHA1_HEADER
   7 #include <zlib.h>
   8
   9 #if ZLIB_VERNUM < 0x1200
  10 #define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  11 #endif
  12
  13 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  14 #define DTYPE(de)       ((de)->d_type)
  15 #else
  16 #undef DT_UNKNOWN
  17 #undef DT_DIR
  18 #undef DT_REG
  19 #undef DT_LNK
  20 #define DT_UNKNOWN      0
  21 #define DT_DIR          1
  22 #define DT_REG          2
  23 #define DT_LNK          3
  24 #define DTYPE(de)       DT_UNKNOWN
  25 #endif
  26
  27 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  28 #define S_IFINVALID     0030000
  29
  30 /*
  31  * A "directory link" is a link to another git directory.
  32  *
  33  * The value 0160000 is not normally a valid mode, and
  34  * also just happens to be S_IFDIR + S_IFLNK
  35  *
  36  * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  37  * always having the same values everywhere. We should use
  38  * our internal git values for these things, and then we can
  39  * translate that to the OS-specific value. It just so
  40  * happens that everybody shares the same bit representation
  41  * in the UNIX world (and apparently wider too..)
  42  */
  43 #define S_IFGITLINK     0160000
  44 #define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  45
  46 /*
  47  * Intensive research over the course of many years has shown that
  48  * port 9418 is totally unused by anything else. Or
  49  *
  50  *      Your search - "port 9418" - did not match any documents.
  51  *
  52  * as www.google.com puts it.
  53  *
  54  * This port has been properly assigned for git use by IANA:
  55  * git (Assigned-9418) [I06-050728-0001].
  56  *
  57  *      git  9418/tcp   git pack transfer service
  58  *      git  9418/udp   git pack transfer service
  59  *
  60  * with Linus Torvalds <torvalds@osdl.org> as the point of
  61  * contact. September 2005.
  62  *
  63  * See http://www.iana.org/assignments/port-numbers
  64  */
  65 #define DEFAULT_GIT_PORT 9418
  66
  67 /*
  68  * Basic data structures for the directory cache
  69  */
  70
  71 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  72 struct cache_header {
  73         unsigned int hdr_signature;
  74         unsigned int hdr_version;
  75         unsigned int hdr_entries;
  76 };
  77
  78 /*
  79  * The "cache_time" is just the low 32 bits of the
  80  * time. It doesn't matter if it overflows - we only
  81  * check it for equality in the 32 bits we save.
  82  */
  83 struct cache_time {
  84         unsigned int sec;
  85         unsigned int nsec;
  86 };
  87
  88 /*
  89  * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  90  * Again - this is just a (very strong in practice) heuristic that
  91  * the inode hasn't changed.
  92  *
  93  * We save the fields in big-endian order to allow using the
  94  * index file over NFS transparently.
  95  */
  96 struct cache_entry {
  97         struct cache_time ce_ctime;
  98         struct cache_time ce_mtime;
  99         unsigned int ce_dev;
 100         unsigned int ce_ino;
 101         unsigned int ce_mode;
 102         unsigned int ce_uid;
 103         unsigned int ce_gid;
 104         unsigned int ce_size;
 105         unsigned char sha1[20];
 106         unsigned short ce_flags;
 107         char name[FLEX_ARRAY]; /* more */
 108 };
 109
 110 #define CE_NAMEMASK  (0x0fff)
 111 #define CE_STAGEMASK (0x3000)
 112 #define CE_UPDATE    (0x4000)
 113 #define CE_VALID     (0x8000)
 114 #define CE_STAGESHIFT 12
 115
 116 #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
 117 #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
 118 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 119 #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
 120
 121 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 122 static inline unsigned int create_ce_mode(unsigned int mode)
 123 {
 124         if (S_ISLNK(mode))
 125                 return htonl(S_IFLNK);
 126         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 127                 return htonl(S_IFGITLINK);
 128         return htonl(S_IFREG | ce_permissions(mode));
 129 }
 130 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 131 {
 132         extern int trust_executable_bit, has_symlinks;
 133         if (!has_symlinks && S_ISREG(mode) &&
 134             ce && S_ISLNK(ntohl(ce->ce_mode)))
 135                 return ce->ce_mode;
 136         if (!trust_executable_bit && S_ISREG(mode)) {
 137                 if (ce && S_ISREG(ntohl(ce->ce_mode)))
 138                         return ce->ce_mode;
 139                 return create_ce_mode(0666);
 140         }
 141         return create_ce_mode(mode);
 142 }
 143 #define canon_mode(mode) \
 144         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 145         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 146
 147 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 148
 149 struct index_state {
 150         struct cache_entry **cache;
 151         unsigned int cache_nr, cache_alloc, cache_changed;
 152         struct cache_tree *cache_tree;
 153         time_t timestamp;
 154         void *mmap;
 155         size_t mmap_size;
 156 };
 157
 158 extern struct index_state the_index;
 159
 160 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 161 #define active_cache (the_index.cache)
 162 #define active_nr (the_index.cache_nr)
 163 #define active_alloc (the_index.cache_alloc)
 164 #define active_cache_changed (the_index.cache_changed)
 165 #define active_cache_tree (the_index.cache_tree)
 166
 167 #define read_cache() read_index(&the_index)
 168 #define read_cache_from(path) read_index_from(&the_index, (path))
 169 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 170 #define discard_cache() discard_index(&the_index)
 171 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 172 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 173 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 174 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 175 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 176 #define refresh_cache(flags) refresh_index(&the_index, flags)
 177 #define ce_match_stat(ce, st, really) ie_match_stat(&the_index, (ce), (st), (really))
 178 #define ce_modified(ce, st, really) ie_modified(&the_index, (ce), (st), (really))
 179 #endif
 180
 181 enum object_type {
 182         OBJ_BAD = -1,
 183         OBJ_NONE = 0,
 184         OBJ_COMMIT = 1,
 185         OBJ_TREE = 2,
 186         OBJ_BLOB = 3,
 187         OBJ_TAG = 4,
 188         /* 5 for future expansion */
 189         OBJ_OFS_DELTA = 6,
 190         OBJ_REF_DELTA = 7,
 191         OBJ_MAX,
 192 };
 193
 194 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 195 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 196 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 197 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 198 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 199 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 200 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 201 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 202 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 203 #define GITATTRIBUTES_FILE ".gitattributes"
 204 #define INFOATTRIBUTES_FILE "info/attributes"
 205 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 206
 207 extern int is_bare_repository_cfg;
 208 extern int is_bare_repository(void);
 209 extern int is_inside_git_dir(void);
 210 extern const char *get_git_dir(void);
 211 extern char *get_object_directory(void);
 212 extern char *get_refs_directory(void);
 213 extern char *get_index_file(void);
 214 extern char *get_graft_file(void);
 215
 216 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 217
 218 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 219 extern const char *setup_git_directory_gently(int *);
 220 extern const char *setup_git_directory(void);
 221 extern const char *prefix_path(const char *prefix, int len, const char *path);
 222 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 223 extern void verify_filename(const char *prefix, const char *name);
 224 extern void verify_non_filename(const char *prefix, const char *name);
 225
 226 #define alloc_nr(x) (((x)+16)*3/2)
 227
 228 /* Initialize and use the cache information */
 229 extern int read_index(struct index_state *);
 230 extern int read_index_from(struct index_state *, const char *path);
 231 extern int write_index(struct index_state *, int newfd);
 232 extern int discard_index(struct index_state *);
 233 extern int verify_path(const char *path);
 234 extern int index_name_pos(struct index_state *, const char *name, int namelen);
 235 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 236 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 237 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 238 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 239 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 240 extern int remove_index_entry_at(struct index_state *, int pos);
 241 extern int remove_file_from_index(struct index_state *, const char *path);
 242 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 243 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 244 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, int);
 245 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, int);
 246 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 247 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 248 extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
 249 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 250 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 251 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 252
 253 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 254 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 255 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 256 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 257 extern int refresh_index(struct index_state *, unsigned int flags);
 258
 259 struct lock_file {
 260         struct lock_file *next;
 261         pid_t owner;
 262         char on_list;
 263         char filename[PATH_MAX];
 264 };
 265 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 266 extern int commit_lock_file(struct lock_file *);
 267
 268 extern int hold_locked_index(struct lock_file *, int);
 269 extern int commit_locked_index(struct lock_file *);
 270 extern void set_alternate_index_output(const char *);
 271
 272 extern void rollback_lock_file(struct lock_file *);
 273 extern int delete_ref(const char *, const unsigned char *sha1);
 274
 275 /* Environment bits from configuration mechanism */
 276 extern int trust_executable_bit;
 277 extern int has_symlinks;
 278 extern int assume_unchanged;
 279 extern int prefer_symlink_refs;
 280 extern int log_all_ref_updates;
 281 extern int warn_ambiguous_refs;
 282 extern int shared_repository;
 283 extern const char *apply_default_whitespace;
 284 extern int zlib_compression_level;
 285 extern int core_compression_level;
 286 extern int core_compression_seen;
 287 extern size_t packed_git_window_size;
 288 extern size_t packed_git_limit;
 289 extern size_t delta_base_cache_limit;
 290 extern int auto_crlf;
 291
 292 #define GIT_REPO_VERSION 0
 293 extern int repository_format_version;
 294 extern int check_repository_format(void);
 295
 296 #define MTIME_CHANGED   0x0001
 297 #define CTIME_CHANGED   0x0002
 298 #define OWNER_CHANGED   0x0004
 299 #define MODE_CHANGED    0x0008
 300 #define INODE_CHANGED   0x0010
 301 #define DATA_CHANGED    0x0020
 302 #define TYPE_CHANGED    0x0040
 303
 304 /* Return a statically allocated filename matching the sha1 signature */
 305 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 306 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 307 extern char *sha1_file_name(const unsigned char *sha1);
 308 extern char *sha1_pack_name(const unsigned char *sha1);
 309 extern char *sha1_pack_index_name(const unsigned char *sha1);
 310 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 311 extern const unsigned char null_sha1[20];
 312 static inline int is_null_sha1(const unsigned char *sha1)
 313 {
 314         return !memcmp(sha1, null_sha1, 20);
 315 }
 316 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 317 {
 318         return memcmp(sha1, sha2, 20);
 319 }
 320 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 321 {
 322         memcpy(sha_dst, sha_src, 20);
 323 }
 324 static inline void hashclr(unsigned char *hash)
 325 {
 326         memset(hash, 0, 20);
 327 }
 328
 329 int git_mkstemp(char *path, size_t n, const char *template);
 330
 331 enum sharedrepo {
 332         PERM_UMASK = 0,
 333         PERM_GROUP,
 334         PERM_EVERYBODY
 335 };
 336 int git_config_perm(const char *var, const char *value);
 337 int adjust_shared_perm(const char *path);
 338 int safe_create_leading_directories(char *path);
 339 char *enter_repo(char *path, int strict);
 340
 341 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 342 extern int sha1_object_info(const unsigned char *, unsigned long *);
 343 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 344 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 345 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 346 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 347
 348 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 349
 350 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 351                               size_t bufsize, size_t *bufposn);
 352 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 353 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 354
 355 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 356 extern int has_sha1_file(const unsigned char *sha1);
 357 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
 358
 359 extern int has_pack_file(const unsigned char *sha1);
 360 extern int has_pack_index(const unsigned char *sha1);
 361
 362 extern signed char hexval_table[256];
 363 static inline unsigned int hexval(unsigned int c)
 364 {
 365         return hexval_table[c];
 366 }
 367
 368 /* Convert to/from hex/sha1 representation */
 369 #define MINIMUM_ABBREV 4
 370 #define DEFAULT_ABBREV 7
 371
 372 extern int get_sha1(const char *str, unsigned char *sha1);
 373 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 374 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 375 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 376 extern int read_ref(const char *filename, unsigned char *sha1);
 377 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 378 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 379 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 380
 381 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 382 extern int validate_headref(const char *ref);
 383
 384 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 385 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 386
 387 extern void *read_object_with_reference(const unsigned char *sha1,
 388                                         const char *required_type,
 389                                         unsigned long *size,
 390                                         unsigned char *sha1_ret);
 391
 392 enum date_mode { DATE_NORMAL = 0, DATE_RELATIVE, DATE_SHORT, DATE_LOCAL };
 393 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 394 const char *show_rfc2822_date(unsigned long time, int timezone);
 395 int parse_date(const char *date, char *buf, int bufsize);
 396 void datestamp(char *buf, int bufsize);
 397 unsigned long approxidate(const char *);
 398
 399 extern const char *git_author_info(int);
 400 extern const char *git_committer_info(int);
 401 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 402
 403 struct checkout {
 404         const char *base_dir;
 405         int base_dir_len;
 406         unsigned force:1,
 407                  quiet:1,
 408                  not_new:1,
 409                  refresh_cache:1;
 410 };
 411
 412 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 413 extern int has_symlink_leading_path(const char *name, char *last_symlink);
 414
 415 extern struct alternate_object_database {
 416         struct alternate_object_database *next;
 417         char *name;
 418         char base[FLEX_ARRAY]; /* more */
 419 } *alt_odb_list;
 420 extern void prepare_alt_odb(void);
 421
 422 struct pack_window {
 423         struct pack_window *next;
 424         unsigned char *base;
 425         off_t offset;
 426         size_t len;
 427         unsigned int last_used;
 428         unsigned int inuse_cnt;
 429 };
 430
 431 extern struct packed_git {
 432         struct packed_git *next;
 433         struct pack_window *windows;
 434         off_t pack_size;
 435         const void *index_data;
 436         size_t index_size;
 437         uint32_t num_objects;
 438         int index_version;
 439         time_t mtime;
 440         int pack_fd;
 441         int pack_local;
 442         unsigned char sha1[20];
 443         /* something like ".git/objects/pack/xxxxx.pack" */
 444         char pack_name[FLEX_ARRAY]; /* more */
 445 } *packed_git;
 446
 447 struct pack_entry {
 448         off_t offset;
 449         unsigned char sha1[20];
 450         struct packed_git *p;
 451 };
 452
 453 struct ref {
 454         struct ref *next;
 455         unsigned char old_sha1[20];
 456         unsigned char new_sha1[20];
 457         unsigned char force;
 458         struct ref *peer_ref; /* when renaming */
 459         char name[FLEX_ARRAY]; /* more */
 460 };
 461
 462 #define REF_NORMAL      (1u << 0)
 463 #define REF_HEADS       (1u << 1)
 464 #define REF_TAGS        (1u << 2)
 465
 466 #define CONNECT_VERBOSE       (1u << 0)
 467 extern pid_t git_connect(int fd[2], char *url, const char *prog, int flags);
 468 extern int finish_connect(pid_t pid);
 469 extern int path_match(const char *path, int nr, char **match);
 470 extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 471                       int nr_refspec, char **refspec, int all);
 472 extern int get_ack(int fd, unsigned char *result_sha1);
 473 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 474 extern int server_supports(const char *feature);
 475
 476 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 477 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 478                                                 const char *idx_path);
 479
 480 extern void prepare_packed_git(void);
 481 extern void reprepare_packed_git(void);
 482 extern void install_packed_git(struct packed_git *pack);
 483
 484 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 485                                          struct packed_git *packs);
 486
 487 extern void pack_report(void);
 488 extern int open_pack_index(struct packed_git *);
 489 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 490 extern void unuse_pack(struct pack_window **);
 491 extern struct packed_git *add_packed_git(const char *, int, int);
 492 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 493 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 494 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 495 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 496 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 497 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 498
 499 /* Dumb servers support */
 500 extern int update_server_info(int);
 501
 502 typedef int (*config_fn_t)(const char *, const char *);
 503 extern int git_default_config(const char *, const char *);
 504 extern int git_config_from_file(config_fn_t fn, const char *);
 505 extern int git_config(config_fn_t fn);
 506 extern int git_config_int(const char *, const char *);
 507 extern int git_config_bool(const char *, const char *);
 508 extern int git_config_set(const char *, const char *);
 509 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 510 extern int git_config_rename_section(const char *, const char *);
 511 extern int check_repository_format_version(const char *var, const char *value);
 512
 513 #define MAX_GITNAME (1000)
 514 extern char git_default_email[MAX_GITNAME];
 515 extern char git_default_name[MAX_GITNAME];
 516
 517 extern const char *git_commit_encoding;
 518 extern const char *git_log_output_encoding;
 519
 520 extern int copy_fd(int ifd, int ofd);
 521 extern int read_in_full(int fd, void *buf, size_t count);
 522 extern int write_in_full(int fd, const void *buf, size_t count);
 523 extern void write_or_die(int fd, const void *buf, size_t count);
 524 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 525 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 526
 527 /* pager.c */
 528 extern void setup_pager(void);
 529 extern int pager_in_use;
 530 extern int pager_use_color;
 531
 532 /* base85 */
 533 int decode_85(char *dst, const char *line, int linelen);
 534 void encode_85(char *buf, const unsigned char *data, int bytes);
 535
 536 /* alloc.c */
 537 extern void *alloc_blob_node(void);
 538 extern void *alloc_tree_node(void);
 539 extern void *alloc_commit_node(void);
 540 extern void *alloc_tag_node(void);
 541 extern void *alloc_object_node(void);
 542 extern void alloc_report(void);
 543
 544 /* trace.c */
 545 extern int nfasprintf(char **str, const char *fmt, ...);
 546 extern int nfvasprintf(char **str, const char *fmt, va_list va);
 547 extern void trace_printf(const char *format, ...);
 548 extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 549
 550 /* convert.c */
 551 extern char *convert_to_git(const char *path, const char *src, unsigned long *sizep);
 552 extern char *convert_to_working_tree(const char *path, const char *src, unsigned long *sizep);
 553 extern void *convert_sha1_file(const char *path, const unsigned char *sha1, unsigned int mode, enum object_type *type, unsigned long *size);
 554
 555 /* match-trees.c */
 556 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 557
 558 #endif /* CACHE_H */