5 * The low 16 bits of the "flags" field shows whether
6 * a commit is part of the path to the root for that
9 * Bit 16 is an internal flag that we've seen the
10 * definition for this rev, and not just seen it as
13 #define marked(rev) ((rev)->flags & 0xffff)
16 #define REACHABLE 0x40000
19 struct revision *parent;
25 unsigned char sha1[20];
27 struct parent *parent;
30 static struct revision **revs;
31 static int nr_revs, rev_allocs;
33 static int find_rev(unsigned char *sha1)
35 int first = 0, last = nr_revs;
37 while (first < last) {
38 int next = (first + last) / 2;
39 struct revision *rev = revs[next];
42 cmp = memcmp(sha1, rev->sha1, 20);
54 static struct revision *lookup_rev(unsigned char *sha1)
56 int pos = find_rev(sha1);
64 if (rev_allocs == nr_revs) {
65 rev_allocs = alloc_nr(rev_allocs);
66 revs = realloc(revs, rev_allocs * sizeof(struct revision *));
68 n = malloc(sizeof(struct revision));
71 memcpy(n->sha1, sha1, 20);
74 /* Insert it into the right place */
75 memmove(revs + pos + 1, revs + pos, (nr_revs - pos) * sizeof(struct revision *));
82 static struct revision *add_relationship(struct revision *rev, unsigned char *needs)
84 struct revision *parent_rev = lookup_rev(needs);
85 struct parent **pp = &rev->parent, *p;
87 while ((p = *pp) != NULL) {
88 if (p->parent == parent_rev)
93 p = malloc(sizeof(*p));
94 p->parent = parent_rev;
100 static void mark_reachable(struct revision *rev, unsigned int mask)
102 struct parent *p = rev->parent;
104 /* If we've been here already, don't bother */
105 if (rev->flags & mask)
107 rev->flags |= mask | USED;
109 mark_reachable(p->parent, mask);
114 static unsigned long parse_commit_date(const char *buf)
118 if (memcmp(buf, "author", 6))
120 while (*buf++ != '\n')
122 if (memcmp(buf, "committer", 9))
124 while (*buf++ != '>')
126 date = strtoul(buf, NULL, 10);
127 if (date == ULONG_MAX)
132 static int parse_commit(unsigned char *sha1)
134 struct revision *rev = lookup_rev(sha1);
136 if (!(rev->flags & SEEN)) {
137 void *buffer, *bufptr;
140 unsigned char parent[20];
143 buffer = bufptr = read_sha1_file(sha1, type, &size);
144 if (!buffer || strcmp(type, "commit"))
146 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
147 while (!memcmp(bufptr, "parent ", 7) && !get_sha1_hex(bufptr+7, parent)) {
148 add_relationship(rev, parent);
149 parse_commit(parent);
150 bufptr += 48; /* "parent " + "hex sha1" + "\n" */
152 rev->date = parse_commit_date(bufptr);
158 #endif /* REVISION_H */