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authorJunio C Hamano <junkio@cox.net>2005-05-08 13:51:13 -0700
committerJunio C Hamano <junkio@cox.net>2005-05-08 13:51:13 -0700
commitddd5d0568d2b3f5f5ec22e13fedbfd041b49019c (patch)
treeeedacfa59dd8bf86b2db1506dda9a042765c0760 /sha1_file.c
parentcf5af17e4561102899ec455d84b6293c9d299910 (diff)
downloadgit-ddd5d0568d2b3f5f5ec22e13fedbfd041b49019c.tar.gz
git-ddd5d0568d2b3f5f5ec22e13fedbfd041b49019c.tar.xz
Stylistic fixes to sha1_file.c
This fixes stylistic problems and one unused variable spotted by Petr Baudis. The buf variable unused in prepare_alt_odb() is gone and the "creepy" function is more heavily documented. Signed-off-by: Junio C Hamano <junkio@cox.net>
Diffstat (limited to 'sha1_file.c')
-rw-r--r--sha1_file.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/sha1_file.c b/sha1_file.c
index bf8fd6aa5..549d45af2 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -141,20 +141,40 @@ char *sha1_file_name(const unsigned char *sha1)
return base;
}
-static struct alternate_object_database
-{
+static struct alternate_object_database {
char *base;
char *name;
} *alt_odb;
+/*
+ * Prepare alternate object database registry.
+ * alt_odb points at an array of struct alternate_object_database.
+ * This array is terminated with an element that has both its base
+ * and name set to NULL. alt_odb[n] comes from n'th non-empty
+ * element from colon separated $SHA1_FILE_DIRECTORIES environment
+ * variable, and its base points at a statically allocated buffer
+ * that contains "/the/directory/corresponding/to/.git/objects/...",
+ * while its name points just after the slash at the end of
+ * ".git/objects/" in the example above, and has enough space to hold
+ * 40-byte hex SHA1, an extra slash for the first level indirection,
+ * and the terminating NUL.
+ * This function allocates the alt_odb array and all the strings
+ * pointed by base fields of the array elements with one xmalloc();
+ * the string pool immediately follows the array.
+ */
static void prepare_alt_odb(void)
{
int pass, totlen, i;
- void *buf;
const char *cp, *last;
char *op = 0;
const char *alt = getenv(ALTERNATE_DB_ENVIRONMENT) ? : "";
+ /* The first pass counts how large an area to allocate to
+ * hold the entire alt_odb structure, including array of
+ * structs and path buffers for them. The second pass fills
+ * the structure and prepares the path buffers for use by
+ * fill_sha1_path().
+ */
for (totlen = pass = 0; pass < 2; pass++) {
last = alt;
i = 0;
@@ -182,7 +202,7 @@ static void prepare_alt_odb(void)
} while (*cp);
if (pass)
break;
- alt_odb = buf = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen);
+ alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen);
alt_odb[i].base = alt_odb[i].name = 0;
op = (char*)(&alt_odb[i+1]);
}