[PATCH] Kill a bunch of pointer sign warnings for gcc4
[git/git.git] / cache.h
1 #ifndef CACHE_H
2 #define CACHE_H
3
4 #include <unistd.h>
5 #include <stdio.h>
6 #include <sys/stat.h>
7 #include <fcntl.h>
8 #include <stddef.h>
9 #include <stdlib.h>
10 #include <stdarg.h>
11 #include <string.h>
12 #include <errno.h>
13 #include <sys/mman.h>
14 #include <sys/param.h>
15 #include <netinet/in.h>
16
17 #include SHA1_HEADER
18 #include <zlib.h>
19
20 #if ZLIB_VERNUM < 0x1200
21 #define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
22 #endif
23
24 #ifdef DT_UNKNOWN
25 #define DTYPE(de) ((de)->d_type)
26 #else
27 #define DT_UNKNOWN 0
28 #define DT_DIR 1
29 #define DT_REG 2
30 #define DT_LNK 3
31 #define DTYPE(de) DT_UNKNOWN
32 #endif
33
34 /*
35 * Environment variables transition.
36 * We accept older names for now but warn.
37 */
38 extern char *gitenv_bc(const char *);
39 #define gitenv(e) (getenv(e) ? : gitenv_bc(e))
40
41 /*
42 * Basic data structures for the directory cache
43 */
44
45 #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
46 struct cache_header {
47 unsigned int hdr_signature;
48 unsigned int hdr_version;
49 unsigned int hdr_entries;
50 };
51
52 /*
53 * The "cache_time" is just the low 32 bits of the
54 * time. It doesn't matter if it overflows - we only
55 * check it for equality in the 32 bits we save.
56 */
57 struct cache_time {
58 unsigned int sec;
59 unsigned int nsec;
60 };
61
62 /*
63 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
64 * Again - this is just a (very strong in practice) heuristic that
65 * the inode hasn't changed.
66 *
67 * We save the fields in big-endian order to allow using the
68 * index file over NFS transparently.
69 */
70 struct cache_entry {
71 struct cache_time ce_ctime;
72 struct cache_time ce_mtime;
73 unsigned int ce_dev;
74 unsigned int ce_ino;
75 unsigned int ce_mode;
76 unsigned int ce_uid;
77 unsigned int ce_gid;
78 unsigned int ce_size;
79 unsigned char sha1[20];
80 unsigned short ce_flags;
81 char name[0];
82 };
83
84 #define CE_NAMEMASK (0x0fff)
85 #define CE_STAGEMASK (0x3000)
86 #define CE_STAGESHIFT 12
87
88 #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
89 #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
90 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
91 #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
92
93 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
94 static inline unsigned int create_ce_mode(unsigned int mode)
95 {
96 if (S_ISLNK(mode))
97 return htonl(S_IFLNK);
98 return htonl(S_IFREG | ce_permissions(mode));
99 }
100
101 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
102
103 extern struct cache_entry **active_cache;
104 extern unsigned int active_nr, active_alloc, active_cache_changed;
105
106 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
107 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
108 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
109 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
110
111 extern char *get_object_directory(void);
112 extern char *get_index_file(void);
113
114 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
115
116 #define alloc_nr(x) (((x)+16)*3/2)
117
118 /* Initialize and use the cache information */
119 extern int read_cache(void);
120 extern int write_cache(int newfd, struct cache_entry **cache, int entries);
121 extern int cache_name_pos(const char *name, int namelen);
122 #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
123 #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
124 extern int add_cache_entry(struct cache_entry *ce, int option);
125 extern int remove_cache_entry_at(int pos);
126 extern int remove_file_from_cache(char *path);
127 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
128 extern int ce_match_stat(struct cache_entry *ce, struct stat *st);
129 extern int index_fd(unsigned char *sha1, int fd, struct stat *st);
130
131 #define MTIME_CHANGED 0x0001
132 #define CTIME_CHANGED 0x0002
133 #define OWNER_CHANGED 0x0004
134 #define MODE_CHANGED 0x0008
135 #define INODE_CHANGED 0x0010
136 #define DATA_CHANGED 0x0020
137 #define TYPE_CHANGED 0x0040
138
139 /* Return a statically allocated filename matching the sha1 signature */
140 extern char *sha1_file_name(const unsigned char *sha1);
141
142 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
143 extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size);
144 extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
145 extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
146 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
147
148 extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type);
149
150 /* Read a tree into the cache */
151 extern int read_tree(void *buffer, unsigned long size, int stage);
152
153 extern int write_sha1_from_fd(const unsigned char *sha1, int fd);
154
155 extern int has_sha1_file(const unsigned char *sha1);
156
157 /* Convert to/from hex/sha1 representation */
158 extern int get_sha1(const char *str, unsigned char *sha1);
159 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
160 extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
161
162 /* General helper functions */
163 extern void usage(const char *err);
164 extern void die(const char *err, ...);
165 extern int error(const char *err, ...);
166
167 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
168
169 extern void *read_object_with_reference(const unsigned char *sha1,
170 const char *required_type,
171 unsigned long *size,
172 unsigned char *sha1_ret);
173
174 const char *show_date(unsigned long time, int timezone);
175 void parse_date(char *date, char *buf, int bufsize);
176 void datestamp(char *buf, int bufsize);
177
178 static inline void *xmalloc(size_t size)
179 {
180 void *ret = malloc(size);
181 if (!ret)
182 die("Out of memory, malloc failed");
183 return ret;
184 }
185
186 static inline void *xrealloc(void *ptr, size_t size)
187 {
188 void *ret = realloc(ptr, size);
189 if (!ret)
190 die("Out of memory, realloc failed");
191 return ret;
192 }
193
194 static inline void *xcalloc(size_t nmemb, size_t size)
195 {
196 void *ret = calloc(nmemb, size);
197 if (!ret)
198 die("Out of memory, calloc failed");
199 return ret;
200 }
201
202 #endif /* CACHE_H */