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Diffstat (limited to 'replace_object.c')
-rw-r--r--replace_object.c37
1 files changed, 21 insertions, 16 deletions
diff --git a/replace_object.c b/replace_object.c
index d0b1548726..0ab2dc1374 100644
--- a/replace_object.c
+++ b/replace_object.c
@@ -3,8 +3,13 @@
#include "refs.h"
#include "commit.h"
+/*
+ * An array of replacements. The array is kept sorted by the original
+ * sha1.
+ */
static struct replace_object {
- unsigned char sha1[2][20];
+ unsigned char original[20];
+ unsigned char replacement[20];
} **replace_object;
static int replace_object_alloc, replace_object_nr;
@@ -12,7 +17,7 @@ static int replace_object_alloc, replace_object_nr;
static const unsigned char *replace_sha1_access(size_t index, void *table)
{
struct replace_object **replace = table;
- return replace[index]->sha1[0];
+ return replace[index]->original;
}
static int replace_object_pos(const unsigned char *sha1)
@@ -24,7 +29,7 @@ static int replace_object_pos(const unsigned char *sha1)
static int register_replace_object(struct replace_object *replace,
int ignore_dups)
{
- int pos = replace_object_pos(replace->sha1[0]);
+ int pos = replace_object_pos(replace->original);
if (0 <= pos) {
if (ignore_dups)
@@ -36,12 +41,8 @@ static int register_replace_object(struct replace_object *replace,
return 1;
}
pos = -pos - 1;
- if (replace_object_alloc <= ++replace_object_nr) {
- replace_object_alloc = alloc_nr(replace_object_alloc);
- replace_object = xrealloc(replace_object,
- sizeof(*replace_object) *
- replace_object_alloc);
- }
+ ALLOC_GROW(replace_object, replace_object_nr + 1, replace_object_alloc);
+ replace_object_nr++;
if (pos < replace_object_nr)
memmove(replace_object + pos + 1,
replace_object + pos,
@@ -60,14 +61,14 @@ static int register_replace_ref(const char *refname,
const char *hash = slash ? slash + 1 : refname;
struct replace_object *repl_obj = xmalloc(sizeof(*repl_obj));
- if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->sha1[0])) {
+ if (strlen(hash) != 40 || get_sha1_hex(hash, repl_obj->original)) {
free(repl_obj);
warning("bad replace ref name: %s", refname);
return 0;
}
/* Copy sha1 from the read ref */
- hashcpy(repl_obj->sha1[1], sha1);
+ hashcpy(repl_obj->replacement, sha1);
/* Register new object */
if (register_replace_object(repl_obj, 1))
@@ -86,20 +87,24 @@ static void prepare_replace_object(void)
for_each_replace_ref(register_replace_ref, NULL);
replace_object_prepared = 1;
if (!replace_object_nr)
- read_replace_refs = 0;
+ check_replace_refs = 0;
}
/* We allow "recursive" replacement. Only within reason, though */
#define MAXREPLACEDEPTH 5
+/*
+ * If a replacement for object sha1 has been set up, return the
+ * replacement object's name (replaced recursively, if necessary).
+ * The return value is either sha1 or a pointer to a
+ * permanently-allocated value. This function always respects replace
+ * references, regardless of the value of check_replace_refs.
+ */
const unsigned char *do_lookup_replace_object(const unsigned char *sha1)
{
int pos, depth = MAXREPLACEDEPTH;
const unsigned char *cur = sha1;
- if (!read_replace_refs)
- return sha1;
-
prepare_replace_object();
/* Try to recursively replace the object */
@@ -110,7 +115,7 @@ const unsigned char *do_lookup_replace_object(const unsigned char *sha1)
pos = replace_object_pos(cur);
if (0 <= pos)
- cur = replace_object[pos]->sha1[1];
+ cur = replace_object[pos]->replacement;
} while (0 <= pos);
return cur;