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;
31 static struct revision **revs;
32 static int nr_revs, rev_allocs;
34 static int find_rev(unsigned char *sha1)
36 int first = 0, last = nr_revs;
38 while (first < last) {
39 int next = (first + last) / 2;
40 struct revision *rev = revs[next];
43 cmp = memcmp(sha1, rev->sha1, 20);
55 static struct revision *lookup_rev(unsigned char *sha1, const char *tag)
57 int pos = find_rev(sha1);
62 if (strcmp(n->tag, tag))
63 error("expected tag %s on object %s: got %s", tag, sha1_to_hex(sha1), n->tag);
69 if (rev_allocs == nr_revs) {
70 rev_allocs = alloc_nr(rev_allocs);
71 revs = realloc(revs, rev_allocs * sizeof(struct revision *));
73 n = malloc(sizeof(struct revision) + strlen(tag));
76 memcpy(n->sha1, sha1, 20);
80 /* Insert it into the right place */
81 memmove(revs + pos + 1, revs + pos, (nr_revs - pos) * sizeof(struct revision *));
88 static struct revision *add_relationship(struct revision *rev, unsigned char *needs, const char *tag)
90 struct revision *parent_rev = lookup_rev(needs, tag);
91 struct parent **pp = &rev->parent, *p;
93 while ((p = *pp) != NULL) {
94 if (p->parent == parent_rev)
99 p = malloc(sizeof(*p));
100 p->parent = parent_rev;
106 static void mark_reachable(struct revision *rev, unsigned int mask)
108 struct parent *p = rev->parent;
110 /* If we've been here already, don't bother */
111 if (rev->flags & mask)
113 rev->flags |= mask | USED;
115 mark_reachable(p->parent, mask);
120 static unsigned long parse_commit_date(const char *buf)
124 if (memcmp(buf, "author", 6))
126 while (*buf++ != '\n')
128 if (memcmp(buf, "committer", 9))
130 while (*buf++ != '>')
132 date = strtoul(buf, NULL, 10);
133 if (date == ULONG_MAX)
138 static struct revision * parse_commit(unsigned char *sha1)
140 struct revision *rev = lookup_rev(sha1, "commit");
142 if (!(rev->flags & SEEN)) {
143 void *buffer, *bufptr;
146 unsigned char parent[20];
149 buffer = bufptr = read_sha1_file(sha1, type, &size);
150 if (!buffer || strcmp(type, "commit"))
151 die("%s is not a commit object", sha1_to_hex(sha1));
152 bufptr += 46; /* "tree " + "hex sha1" + "\n" */
153 while (!memcmp(bufptr, "parent ", 7) && !get_sha1_hex(bufptr+7, parent)) {
154 add_relationship(rev, parent, "commit");
155 parse_commit(parent);
156 bufptr += 48; /* "parent " + "hex sha1" + "\n" */
158 rev->date = parse_commit_date(bufptr);
164 #endif /* REVISION_H */