Don't instantiate structures with FAMs.

Since structures with `flexible array members' are an incomplete datatype ANSI
C99 forbids creating instances of them. This patch removes such an instance
from `diff-lib.c' and replaces it with a pointer to a `struct
combine_diff_path'. Since all neccessary memory is allocated at once the number
of calls to `xmalloc' is not increased.

diff --git a/diff-lib.c b/diff-lib.c
index 2183b41..fdc1173 100644 (file)
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -34,21 +34,23 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
                        continue;
 
                if (ce_stage(ce)) {
-                       struct {
-                               struct combine_diff_path p;
-                               struct combine_diff_parent filler[5];
-                       } combine;
+                       struct combine_diff_path *dpath;
                        int num_compare_stages = 0;
+                       size_t path_len;
 
-                       combine.p.next = NULL;
-                       combine.p.len = ce_namelen(ce);
-                       combine.p.path = xmalloc(combine.p.len + 1);
-                       memcpy(combine.p.path, ce->name, combine.p.len);
-                       combine.p.path[combine.p.len] = 0;
-                       combine.p.mode = 0;
-                       memset(combine.p.sha1, 0, 20);
-                       memset(&combine.p.parent[0], 0,
-                              sizeof(combine.filler));
+                       path_len = ce_namelen(ce);
+
+                       dpath = xmalloc (combine_diff_path_size (5, path_len));
+                       dpath->path = (char *) &(dpath->parent[5]);
+
+                       dpath->next = NULL;
+                       dpath->len = path_len;
+                       memcpy(dpath->path, ce->name, path_len);
+                       dpath->path[path_len] = '\0';
+                       dpath->mode = 0;
+                       memset(dpath->sha1, 0, 20);
+                       memset(&(dpath->parent[0]), 0,
+                                       sizeof(struct combine_diff_parent)*5);
 
                        while (i < entries) {
                                struct cache_entry *nce = active_cache[i];
@@ -64,11 +66,11 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
                                if (2 <= stage) {
                                        int mode = ntohl(nce->ce_mode);
                                        num_compare_stages++;
-                                       memcpy(combine.p.parent[stage-2].sha1,
+                                       memcpy(dpath->parent[stage-2].sha1,
                                               nce->sha1, 20);
-                                       combine.p.parent[stage-2].mode =
+                                       dpath->parent[stage-2].mode =
                                                canon_mode(mode);
-                                       combine.p.parent[stage-2].status =
+                                       dpath->parent[stage-2].status =
                                                DIFF_STATUS_MODIFIED;
                                }
 
@@ -83,13 +85,14 @@ int run_diff_files(struct rev_info *revs, int silent_on_removed)
                        i--;
 
                        if (revs->combine_merges && num_compare_stages == 2) {
-                               show_combined_diff(&combine.p, 2,
+                               show_combined_diff(dpath, 2,
                                                   revs->dense_combined_merges,
                                                   revs);
-                               free(combine.p.path);
+                               free(dpath);
                                continue;
                        }
-                       free(combine.p.path);
+                       free(dpath);
+                       dpath = NULL;
 
                        /*
                         * Show the diff for the 'ce' if we found the one