sha1_file: normalize alt_odb path before comparing and storing

When it needs to compare and add an alt object path to the
alt_odb_list, we normalize this path first since comparing normalized
path is easy to get correct result.

Use strbuf to replace some string operations, since it is cleaner and
safer.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Hui Wang <Hui.Wang@windriver.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/sha1_file.c b/sha1_file.c
index 064a33040812ba8782bf602c693abf08613d6ec7..d880137ef448d36940c5dd25d4c7d6fef5371a78 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -248,27 +248,30 @@ static int link_alt_odb_entry(const char * entry, int len, const char * relative
        const char *objdir = get_object_directory();
        struct alternate_object_database *ent;
        struct alternate_object_database *alt;
-       /* 43 = 40-byte + 2 '/' + terminating NUL */
-       int pfxlen = len;
-       int entlen = pfxlen + 43;
-       int base_len = -1;
+       int pfxlen, entlen;
+       struct strbuf pathbuf = STRBUF_INIT;
 
        if (!is_absolute_path(entry) && relative_base) {
-               /* Relative alt-odb */
-               if (base_len < 0)
-                       base_len = strlen(relative_base) + 1;
-               entlen += base_len;
-               pfxlen += base_len;
+               strbuf_addstr(&pathbuf, real_path(relative_base));
+               strbuf_addch(&pathbuf, '/');
        }
-       ent = xmalloc(sizeof(*ent) + entlen);
+       strbuf_add(&pathbuf, entry, len);
 
-       if (!is_absolute_path(entry) && relative_base) {
-               memcpy(ent->base, relative_base, base_len - 1);
-               ent->base[base_len - 1] = '/';
-               memcpy(ent->base + base_len, entry, len);
-       }
-       else
-               memcpy(ent->base, entry, pfxlen);
+       normalize_path_copy(pathbuf.buf, pathbuf.buf);
+
+       pfxlen = strlen(pathbuf.buf);
+
+       /*
+        * The trailing slash after the directory name is given by
+        * this function at the end. Remove duplicates.
+        */
+       while (pfxlen && pathbuf.buf[pfxlen-1] == '/')
+               pfxlen -= 1;
+
+       entlen = pfxlen + 43; /* '/' + 2 hex + '/' + 38 hex + NUL */
+       ent = xmalloc(sizeof(*ent) + entlen);
+       memcpy(ent->base, pathbuf.buf, pfxlen);
+       strbuf_release(&pathbuf);
 
        ent->name = ent->base + pfxlen + 1;
        ent->base[pfxlen + 3] = '/';