t4039: abstract away SHA-1-specific constants

[thirdparty/git.git] / tree-walk.c

diff --git a/tree-walk.c b/tree-walk.c
index c20b62f49e4709253d71e18eea0a2472809d8e9d..bea819d826fb1c855a7b92dbe2605885c12f5c16 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -170,40 +170,61 @@ int tree_entry_gently(struct tree_desc *desc, struct name_entry *entry)
 
 void setup_traverse_info(struct traverse_info *info, const char *base)
 {
-       int pathlen = strlen(base);
+       size_t pathlen = strlen(base);
        static struct traverse_info dummy;
 
        memset(info, 0, sizeof(*info));
        if (pathlen && base[pathlen-1] == '/')
                pathlen--;
        info->pathlen = pathlen ? pathlen + 1 : 0;
-       info->name.path = base;
-       info->name.pathlen = pathlen;
-       if (pathlen) {
-               hashcpy(info->name.oid.hash, (const unsigned char *)base + pathlen + 1);
+       info->name = base;
+       info->namelen = pathlen;
+       if (pathlen)
                info->prev = &dummy;
-       }
 }
 
-char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n)
+char *make_traverse_path(char *path, size_t pathlen,
+                        const struct traverse_info *info,
+                        const char *name, size_t namelen)
 {
-       int len = tree_entry_len(n);
-       int pathlen = info->pathlen;
+       /* Always points to the end of the name we're about to add */
+       size_t pos = st_add(info->pathlen, namelen);
+
+       if (pos >= pathlen)
+               BUG("too small buffer passed to make_traverse_path");
 
-       path[pathlen + len] = 0;
+       path[pos] = 0;
        for (;;) {
-               memcpy(path + pathlen, n->path, len);
-               if (!pathlen)
+               if (pos < namelen)
+                       BUG("traverse_info pathlen does not match strings");
+               pos -= namelen;
+               memcpy(path + pos, name, namelen);
+
+               if (!pos)
                        break;
-               path[--pathlen] = '/';
-               n = &info->name;
-               len = tree_entry_len(n);
+               path[--pos] = '/';
+
+               if (!info)
+                       BUG("traverse_info ran out of list items");
+               name = info->name;
+               namelen = info->namelen;
                info = info->prev;
-               pathlen -= len;
        }
        return path;
 }
 
+void strbuf_make_traverse_path(struct strbuf *out,
+                              const struct traverse_info *info,
+                              const char *name, size_t namelen)
+{
+       size_t len = traverse_path_len(info, namelen);
+
+       strbuf_grow(out, len);
+       make_traverse_path(out->buf + out->len, out->alloc - out->len,
+                          info, name, namelen);
+       strbuf_setlen(out, out->len + len);
+}
+
 struct tree_desc_skip {
        struct tree_desc_skip *prev;
        const void *ptr;
@@ -400,13 +421,12 @@ int traverse_trees(struct index_state *istate,
                tx[i].d = t[i];
 
        if (info->prev) {
-               strbuf_grow(&base, info->pathlen);
-               make_traverse_path(base.buf, info->prev, &info->name);
-               base.buf[info->pathlen-1] = '/';
-               strbuf_setlen(&base, info->pathlen);
-               traverse_path = xstrndup(base.buf, info->pathlen);
+               strbuf_make_traverse_path(&base, info->prev,
+                                         info->name, info->namelen);
+               strbuf_addch(&base, '/');
+               traverse_path = xstrndup(base.buf, base.len);
        } else {
-               traverse_path = xstrndup(info->name.path, info->pathlen);
+               traverse_path = xstrndup(info->name, info->pathlen);
        }
        info->traverse_path = traverse_path;
        for (;;) {