diff options
| -rw-r--r-- | sha1_file.c | 28 |
1 files changed, 24 insertions, 4 deletions
diff --git a/sha1_file.c b/sha1_file.c index bf8fd6a..549d45a 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]); } |