Andrew's git / gitweb.git / cache.h
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cache.hon commit Fix t5516-fetch for systems where `wc -l` outputs whitespace. (9a3c6f7)
   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" */
  72struct 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 */
  83struct 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 */
  96struct 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)
 122static 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}
 130static 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
 149struct 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
 158extern 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
 181enum 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 GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 196#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 197#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 198#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 199#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 200#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 201#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 202#define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 203#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 204#define GITATTRIBUTES_FILE ".gitattributes"
 205#define INFOATTRIBUTES_FILE "info/attributes"
 206#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 207
 208extern int is_bare_repository_cfg;
 209extern int is_bare_repository(void);
 210extern int is_inside_git_dir(void);
 211extern int is_inside_work_tree(void);
 212extern const char *get_git_dir(void);
 213extern char *get_object_directory(void);
 214extern char *get_refs_directory(void);
 215extern char *get_index_file(void);
 216extern char *get_graft_file(void);
 217
 218#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 219
 220extern const char **get_pathspec(const char *prefix, const char **pathspec);
 221extern const char *setup_git_directory_gently(int *);
 222extern const char *setup_git_directory(void);
 223extern const char *prefix_path(const char *prefix, int len, const char *path);
 224extern const char *prefix_filename(const char *prefix, int len, const char *path);
 225extern void verify_filename(const char *prefix, const char *name);
 226extern void verify_non_filename(const char *prefix, const char *name);
 227
 228#define alloc_nr(x) (((x)+16)*3/2)
 229
 230/*
 231 * Realloc the buffer pointed at by variable 'x' so that it can hold
 232 * at least 'nr' entries; the number of entries currently allocated
 233 * is 'alloc', using the standard growing factor alloc_nr() macro.
 234 *
 235 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 236 */
 237#define ALLOC_GROW(x, nr, alloc) \
 238        do { \
 239                if ((nr) > alloc) { \
 240                        if (alloc_nr(alloc) < (nr)) \
 241                                alloc = (nr); \
 242                        else \
 243                                alloc = alloc_nr(alloc); \
 244                        x = xrealloc((x), alloc * sizeof(*(x))); \
 245                } \
 246        } while(0)
 247
 248/* Initialize and use the cache information */
 249extern int read_index(struct index_state *);
 250extern int read_index_from(struct index_state *, const char *path);
 251extern int write_index(struct index_state *, int newfd);
 252extern int discard_index(struct index_state *);
 253extern int verify_path(const char *path);
 254extern int index_name_pos(struct index_state *, const char *name, int namelen);
 255#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 256#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 257#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 258extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 259extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 260extern int remove_index_entry_at(struct index_state *, int pos);
 261extern int remove_file_from_index(struct index_state *, const char *path);
 262extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 263extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 264extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, int);
 265extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, int);
 266extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 267extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 268extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
 269extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 270extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 271extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 272
 273#define REFRESH_REALLY          0x0001  /* ignore_valid */
 274#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 275#define REFRESH_QUIET           0x0004  /* be quiet about it */
 276#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 277extern int refresh_index(struct index_state *, unsigned int flags);
 278
 279struct lock_file {
 280        struct lock_file *next;
 281        pid_t owner;
 282        char on_list;
 283        char filename[PATH_MAX];
 284};
 285extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 286extern int commit_lock_file(struct lock_file *);
 287
 288extern int hold_locked_index(struct lock_file *, int);
 289extern int commit_locked_index(struct lock_file *);
 290extern void set_alternate_index_output(const char *);
 291
 292extern void rollback_lock_file(struct lock_file *);
 293extern int delete_ref(const char *, const unsigned char *sha1);
 294
 295/* Environment bits from configuration mechanism */
 296extern int trust_executable_bit;
 297extern int has_symlinks;
 298extern int assume_unchanged;
 299extern int prefer_symlink_refs;
 300extern int log_all_ref_updates;
 301extern int warn_ambiguous_refs;
 302extern int shared_repository;
 303extern const char *apply_default_whitespace;
 304extern int zlib_compression_level;
 305extern int core_compression_level;
 306extern int core_compression_seen;
 307extern size_t packed_git_window_size;
 308extern size_t packed_git_limit;
 309extern size_t delta_base_cache_limit;
 310extern int auto_crlf;
 311
 312#define GIT_REPO_VERSION 0
 313extern int repository_format_version;
 314extern int check_repository_format(void);
 315
 316#define MTIME_CHANGED   0x0001
 317#define CTIME_CHANGED   0x0002
 318#define OWNER_CHANGED   0x0004
 319#define MODE_CHANGED    0x0008
 320#define INODE_CHANGED   0x0010
 321#define DATA_CHANGED    0x0020
 322#define TYPE_CHANGED    0x0040
 323
 324/* Return a statically allocated filename matching the sha1 signature */
 325extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 326extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 327extern char *sha1_file_name(const unsigned char *sha1);
 328extern char *sha1_pack_name(const unsigned char *sha1);
 329extern char *sha1_pack_index_name(const unsigned char *sha1);
 330extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 331extern const unsigned char null_sha1[20];
 332static inline int is_null_sha1(const unsigned char *sha1)
 333{
 334        return !memcmp(sha1, null_sha1, 20);
 335}
 336static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 337{
 338        return memcmp(sha1, sha2, 20);
 339}
 340static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 341{
 342        memcpy(sha_dst, sha_src, 20);
 343}
 344static inline void hashclr(unsigned char *hash)
 345{
 346        memset(hash, 0, 20);
 347}
 348
 349int git_mkstemp(char *path, size_t n, const char *template);
 350
 351enum sharedrepo {
 352        PERM_UMASK = 0,
 353        PERM_GROUP,
 354        PERM_EVERYBODY
 355};
 356int git_config_perm(const char *var, const char *value);
 357int adjust_shared_perm(const char *path);
 358int safe_create_leading_directories(char *path);
 359char *enter_repo(char *path, int strict);
 360
 361/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 362extern int sha1_object_info(const unsigned char *, unsigned long *);
 363extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 364extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 365extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 366extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 367
 368extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 369
 370extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 371                              size_t bufsize, size_t *bufposn);
 372extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 373extern int move_temp_to_file(const char *tmpfile, const char *filename);
 374
 375extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 376extern int has_sha1_file(const unsigned char *sha1);
 377
 378extern int has_pack_file(const unsigned char *sha1);
 379extern int has_pack_index(const unsigned char *sha1);
 380
 381extern const signed char hexval_table[256];
 382static inline unsigned int hexval(unsigned char c)
 383{
 384        return hexval_table[c];
 385}
 386
 387/* Convert to/from hex/sha1 representation */
 388#define MINIMUM_ABBREV 4
 389#define DEFAULT_ABBREV 7
 390
 391extern int get_sha1(const char *str, unsigned char *sha1);
 392extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 393extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 394extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 395extern int read_ref(const char *filename, unsigned char *sha1);
 396extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 397extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 398extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 399
 400extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 401extern int validate_headref(const char *ref);
 402
 403extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 404extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 405
 406extern void *read_object_with_reference(const unsigned char *sha1,
 407                                        const char *required_type,
 408                                        unsigned long *size,
 409                                        unsigned char *sha1_ret);
 410
 411enum date_mode { DATE_NORMAL = 0, DATE_RELATIVE, DATE_SHORT, DATE_LOCAL };
 412const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 413const char *show_rfc2822_date(unsigned long time, int timezone);
 414int parse_date(const char *date, char *buf, int bufsize);
 415void datestamp(char *buf, int bufsize);
 416unsigned long approxidate(const char *);
 417
 418extern const char *git_author_info(int);
 419extern const char *git_committer_info(int);
 420extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 421
 422struct checkout {
 423        const char *base_dir;
 424        int base_dir_len;
 425        unsigned force:1,
 426                 quiet:1,
 427                 not_new:1,
 428                 refresh_cache:1;
 429};
 430
 431extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 432extern int has_symlink_leading_path(const char *name, char *last_symlink);
 433
 434extern struct alternate_object_database {
 435        struct alternate_object_database *next;
 436        char *name;
 437        char base[FLEX_ARRAY]; /* more */
 438} *alt_odb_list;
 439extern void prepare_alt_odb(void);
 440
 441struct pack_window {
 442        struct pack_window *next;
 443        unsigned char *base;
 444        off_t offset;
 445        size_t len;
 446        unsigned int last_used;
 447        unsigned int inuse_cnt;
 448};
 449
 450extern struct packed_git {
 451        struct packed_git *next;
 452        struct pack_window *windows;
 453        off_t pack_size;
 454        const void *index_data;
 455        size_t index_size;
 456        uint32_t num_objects;
 457        int index_version;
 458        time_t mtime;
 459        int pack_fd;
 460        int pack_local;
 461        unsigned char sha1[20];
 462        /* something like ".git/objects/pack/xxxxx.pack" */
 463        char pack_name[FLEX_ARRAY]; /* more */
 464} *packed_git;
 465
 466struct pack_entry {
 467        off_t offset;
 468        unsigned char sha1[20];
 469        struct packed_git *p;
 470};
 471
 472struct ref {
 473        struct ref *next;
 474        unsigned char old_sha1[20];
 475        unsigned char new_sha1[20];
 476        unsigned char force;
 477        struct ref *peer_ref; /* when renaming */
 478        char name[FLEX_ARRAY]; /* more */
 479};
 480
 481#define REF_NORMAL      (1u << 0)
 482#define REF_HEADS       (1u << 1)
 483#define REF_TAGS        (1u << 2)
 484
 485#define CONNECT_VERBOSE       (1u << 0)
 486extern pid_t git_connect(int fd[2], char *url, const char *prog, int flags);
 487extern int finish_connect(pid_t pid);
 488extern int path_match(const char *path, int nr, char **match);
 489extern int get_ack(int fd, unsigned char *result_sha1);
 490extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 491extern int server_supports(const char *feature);
 492
 493extern struct packed_git *parse_pack_index(unsigned char *sha1);
 494extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 495                                                const char *idx_path);
 496
 497extern void prepare_packed_git(void);
 498extern void reprepare_packed_git(void);
 499extern void install_packed_git(struct packed_git *pack);
 500
 501extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 502                                         struct packed_git *packs);
 503
 504extern void pack_report(void);
 505extern int open_pack_index(struct packed_git *);
 506extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 507extern void unuse_pack(struct pack_window **);
 508extern struct packed_git *add_packed_git(const char *, int, int);
 509extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 510extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 511extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 512extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 513extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 514extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 515
 516/* Dumb servers support */
 517extern int update_server_info(int);
 518
 519typedef int (*config_fn_t)(const char *, const char *);
 520extern int git_default_config(const char *, const char *);
 521extern int git_config_from_file(config_fn_t fn, const char *);
 522extern int git_config(config_fn_t fn);
 523extern int git_config_int(const char *, const char *);
 524extern int git_config_bool(const char *, const char *);
 525extern int git_config_set(const char *, const char *);
 526extern int git_config_set_multivar(const char *, const char *, const char *, int);
 527extern int git_config_rename_section(const char *, const char *);
 528extern int check_repository_format_version(const char *var, const char *value);
 529
 530#define MAX_GITNAME (1000)
 531extern char git_default_email[MAX_GITNAME];
 532extern char git_default_name[MAX_GITNAME];
 533
 534extern const char *git_commit_encoding;
 535extern const char *git_log_output_encoding;
 536
 537/* IO helper functions */
 538extern void maybe_flush_or_die(FILE *, const char *);
 539extern int copy_fd(int ifd, int ofd);
 540extern int read_in_full(int fd, void *buf, size_t count);
 541extern int write_in_full(int fd, const void *buf, size_t count);
 542extern void write_or_die(int fd, const void *buf, size_t count);
 543extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 544extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 545
 546/* pager.c */
 547extern void setup_pager(void);
 548extern int pager_in_use;
 549extern int pager_use_color;
 550
 551/* base85 */
 552int decode_85(char *dst, const char *line, int linelen);
 553void encode_85(char *buf, const unsigned char *data, int bytes);
 554
 555/* alloc.c */
 556extern void *alloc_blob_node(void);
 557extern void *alloc_tree_node(void);
 558extern void *alloc_commit_node(void);
 559extern void *alloc_tag_node(void);
 560extern void *alloc_object_node(void);
 561extern void alloc_report(void);
 562
 563/* trace.c */
 564extern int nfasprintf(char **str, const char *fmt, ...);
 565extern int nfvasprintf(char **str, const char *fmt, va_list va);
 566extern void trace_printf(const char *format, ...);
 567extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 568
 569/* convert.c */
 570extern char *convert_to_git(const char *path, const char *src, unsigned long *sizep);
 571extern char *convert_to_working_tree(const char *path, const char *src, unsigned long *sizep);
 572extern void *convert_sha1_file(const char *path, const unsigned char *sha1, unsigned int mode, enum object_type *type, unsigned long *size);
 573
 574/* match-trees.c */
 575void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 576
 577#endif /* CACHE_H */