[PATCH 2/4] fast-import: allow atom_table to grow dynamically

[Jonathan Nieder <jrnieder@gmail.com>]

From: David Barr <david.barr@cordelta.com>
Date: Thu, 31 Mar 2011 22:59:57 +1100

Use a struct hash_table to allow the table for atom strings to
grow.  See the previous commit for explanations.

[jn: with init_hash call, even though it's technically not needed]

Signed-off-by: David Barr <david.barr@cordelta.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 fast-import.c |   18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/fast-import.c b/fast-import.c
index a79a1260..67769573 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -299,9 +299,8 @@ static size_t total_allocd;
 static struct mem_pool *mem_pool;
 
 /* Atom management */
-static unsigned int atom_table_sz = 4451;
 static unsigned int atom_cnt;
-static struct atom_str **atom_table;
+static struct hash_table atom_table;
 
 /* The .pack file being generated */
 static unsigned int pack_id;
@@ -691,10 +690,11 @@ static struct object_entry *find_mark(uintmax_t idnum)
 
 static struct atom_str *to_atom(const char *s, unsigned short len)
 {
-	unsigned int hc = hc_str(s, len) % atom_table_sz;
+	unsigned int hc = hc_str(s, len);
 	struct atom_str *c;
+	void **pos;
 
-	for (c = atom_table[hc]; c; c = c->next_atom)
+	for (c = lookup_hash(hc, &atom_table); c; c = c->next_atom)
 		if (c->str_len == len && !strncmp(s, c->str_dat, len))
 			return c;
 
@@ -702,8 +702,12 @@ static struct atom_str *to_atom(const char *s, unsigned short len)
 	c->str_len = len;
 	strncpy(c->str_dat, s, len);
 	c->str_dat[len] = 0;
-	c->next_atom = atom_table[hc];
-	atom_table[hc] = c;
+	c->next_atom = NULL;
+	pos = insert_hash(hc, c, &atom_table);
+	if (pos) {
+		c->next_atom = *pos;
+		*pos = c;
+	}
 	atom_cnt++;
 	return c;
 }
@@ -3270,7 +3274,7 @@ int main(int argc, const char **argv)
 
 	alloc_objects(object_entry_alloc);
 	strbuf_init(&command_buf, 0);
-	atom_table = xcalloc(atom_table_sz, sizeof(struct atom_str*));
+	init_hash(&atom_table);
 	branch_table = xcalloc(branch_table_sz, sizeof(struct branch*));
 	avail_tree_table = xcalloc(avail_tree_table_sz, sizeof(struct avail_tree_content*));
 	init_hash(&object_table);
-- 
1.7.10