grep: use writable strbuf from caller for grep_tree()

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/grep.c b/builtin/grep.c
index 16a2fde9477c4c99f0342f156c4e767ef253c203..c9622d6aa99658664e5a72129400987a9e3a5553 100644 (file)
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -619,43 +619,29 @@ static int grep_cache(struct grep_opt *opt, const struct pathspec *pathspec, int
 }
 
 static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
-                    struct tree_desc *tree,
-                    const char *tree_name, const char *base)
+                    struct tree_desc *tree, struct strbuf *base, int tn_len)
 {
-       int len;
        int hit = 0;
        struct name_entry entry;
-       char *down;
-       int tn_len = strlen(tree_name);
-       struct strbuf pathbuf;
-
-       strbuf_init(&pathbuf, PATH_MAX + tn_len);
-
-       if (tn_len) {
-               strbuf_add(&pathbuf, tree_name, tn_len);
-               strbuf_addch(&pathbuf, ':');
-               tn_len = pathbuf.len;
-       }
-       strbuf_addstr(&pathbuf, base);
-       len = pathbuf.len;
+       int old_baselen = base->len;
 
        while (tree_entry(tree, &entry)) {
                int te_len = tree_entry_len(entry.path, entry.sha1);
-               pathbuf.len = len;
-               strbuf_add(&pathbuf, entry.path, te_len);
+
+               strbuf_add(base, entry.path, te_len);
 
                if (S_ISDIR(entry.mode))
                        /* Match "abc/" against pathspec to
                         * decide if we want to descend into "abc"
                         * directory.
                         */
-                       strbuf_addch(&pathbuf, '/');
+                       strbuf_addch(base, '/');
 
-               down = pathbuf.buf + tn_len;
-               if (!pathspec_matches(pathspec->raw, down, opt->max_depth))
+               if (!pathspec_matches(pathspec->raw, base->buf + tn_len, opt->max_depth))
                        ;
-               else if (S_ISREG(entry.mode))
-                       hit |= grep_sha1(opt, entry.sha1, pathbuf.buf, tn_len);
+               else if (S_ISREG(entry.mode)) {
+                       hit |= grep_sha1(opt, entry.sha1, base->buf, tn_len);
+               }
                else if (S_ISDIR(entry.mode)) {
                        enum object_type type;
                        struct tree_desc sub;
@@ -667,13 +653,14 @@ static int grep_tree(struct grep_opt *opt, const struct pathspec *pathspec,
                                die("unable to read tree (%s)",
                                    sha1_to_hex(entry.sha1));
                        init_tree_desc(&sub, data, size);
-                       hit |= grep_tree(opt, pathspec, &sub, tree_name, down);
+                       hit |= grep_tree(opt, pathspec, &sub, base, tn_len);
                        free(data);
                }
+               strbuf_setlen(base, old_baselen);
+
                if (hit && opt->status_only)
                        break;
        }
-       strbuf_release(&pathbuf);
        return hit;
 }
 
@@ -686,13 +673,23 @@ static int grep_object(struct grep_opt *opt, const struct pathspec *pathspec,
                struct tree_desc tree;
                void *data;
                unsigned long size;
-               int hit;
+               struct strbuf base;
+               int hit, len;
+
                data = read_object_with_reference(obj->sha1, tree_type,
                                                  &size, NULL);
                if (!data)
                        die("unable to read tree (%s)", sha1_to_hex(obj->sha1));
+
+               len = name ? strlen(name) : 0;
+               strbuf_init(&base, PATH_MAX + len + 1);
+               if (len) {
+                       strbuf_add(&base, name, len);
+                       strbuf_addch(&base, ':');
+               }
                init_tree_desc(&tree, data, size);
-               hit = grep_tree(opt, pathspec, &tree, name, "");
+               hit = grep_tree(opt, pathspec, &tree, &base, base.len);
+               strbuf_release(&base);
                free(data);
                return hit;
        }