git-svn: avoid filling up the disk with temp files.

diff --git a/tree-walk.c b/tree-walk.c
index 8d4b67317f21508a105175686c7ec98a090ed9b5..02e2aed7737207225f1b96eed774a1b75dd6d8d9 100644 (file)
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -7,6 +7,9 @@ static const char *get_mode(const char *str, unsigned int *modep)
        unsigned char c;
        unsigned int mode = 0;
 
+       if (*str == ' ')
+               return NULL;
+
        while ((c = *str++) != ' ') {
                if (c < '0' || c > '7')
                        return NULL;
@@ -16,13 +19,16 @@ static const char *get_mode(const char *str, unsigned int *modep)
        return str;
 }
 
-static void decode_tree_entry(struct tree_desc *desc, const void *buf, unsigned long size)
+static void decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned long size)
 {
        const char *path;
        unsigned int mode, len;
 
+       if (size < 24 || buf[size - 21])
+               die("corrupt tree file");
+
        path = get_mode(buf, &mode);
-       if (!path)
+       if (!path || !*path)
                die("corrupt tree file");
        len = strlen(path) + 1;
 
@@ -56,7 +62,7 @@ void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1)
 
 static int entry_compare(struct name_entry *a, struct name_entry *b)
 {
-       return base_name_compare(
+       return df_name_compare(
                        a->path, tree_entry_len(a->path, a->sha1), a->mode,
                        b->path, tree_entry_len(b->path, b->sha1), b->mode);
 }
@@ -98,12 +104,48 @@ int tree_entry(struct tree_desc *desc, struct name_entry *entry)
        return 1;
 }
 
-void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback)
+void setup_traverse_info(struct traverse_info *info, const char *base)
+{
+       int 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.sha1 = (void *)(base + pathlen + 1);
+       if (pathlen)
+               info->prev = &dummy;
+}
+
+char *make_traverse_path(char *path, const struct traverse_info *info, const struct name_entry *n)
+{
+       int len = tree_entry_len(n->path, n->sha1);
+       int pathlen = info->pathlen;
+
+       path[pathlen + len] = 0;
+       for (;;) {
+               memcpy(path + pathlen, n->path, len);
+               if (!pathlen)
+                       break;
+               path[--pathlen] = '/';
+               n = &info->name;
+               len = tree_entry_len(n->path, n->sha1);
+               info = info->prev;
+               pathlen -= len;
+       }
+       return path;
+}
+
+int traverse_trees(int n, struct tree_desc *t, struct traverse_info *info)
 {
+       int ret = 0;
        struct name_entry *entry = xmalloc(n*sizeof(*entry));
 
        for (;;) {
                unsigned long mask = 0;
+               unsigned long dirmask = 0;
                int i, last;
 
                last = -1;
@@ -128,25 +170,35 @@ void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callb
                                        mask = 0;
                        }
                        mask |= 1ul << i;
+                       if (S_ISDIR(entry[i].mode))
+                               dirmask |= 1ul << i;
                        last = i;
                }
                if (!mask)
                        break;
+               dirmask &= mask;
 
                /*
-                * Update the tree entries we've walked, and clear
-                * all the unused name-entries.
+                * Clear all the unused name-entries.
                 */
                for (i = 0; i < n; i++) {
-                       if (mask & (1ul << i)) {
-                               update_tree_entry(t+i);
+                       if (mask & (1ul << i))
                                continue;
-                       }
                        entry_clear(entry + i);
                }
-               callback(n, mask, entry, base);
+               ret = info->fn(n, mask, dirmask, entry, info);
+               if (ret < 0)
+                       break;
+               if (ret)
+                       mask &= ret;
+               ret = 0;
+               for (i = 0; i < n; i++) {
+                       if (mask & (1ul << i))
+                               update_tree_entry(t + i);
+               }
        }
        free(entry);
+       return ret;
 }
 
 static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)