merge-tool documentation: describe custom command usage

[git.git] / diff-lib.c

diff --git a/diff-lib.c b/diff-lib.c
index 03eaa7cef35dfaec0a8f61b2b96892e5604ed731..4581b594d0a65d5bbe782b1db5d69f33189a0e50 100644 (file)
--- a/diff-lib.c
+++ b/diff-lib.c
@@ -472,22 +472,21 @@ int run_diff_files(struct rev_info *revs, unsigned int option)
 static void diff_index_show_file(struct rev_info *revs,
                                 const char *prefix,
                                 struct cache_entry *ce,
-                                unsigned char *sha1, unsigned int mode)
+                                const unsigned char *sha1, unsigned int mode)
 {
        diff_addremove(&revs->diffopt, prefix[0], mode,
                       sha1, ce->name, NULL);
 }
 
 static int get_stat_data(struct cache_entry *ce,
-                        unsigned char **sha1p,
+                        const unsigned char **sha1p,
                         unsigned int *modep,
                         int cached, int match_missing)
 {
-       unsigned char *sha1 = ce->sha1;
+       const unsigned char *sha1 = ce->sha1;
        unsigned int mode = ce->ce_mode;
 
        if (!cached) {
-               static unsigned char no_sha1[20];
                int changed;
                struct stat st;
                if (lstat(ce->name, &st) < 0) {
@@ -501,7 +500,7 @@ static int get_stat_data(struct cache_entry *ce,
                changed = ce_match_stat(ce, &st, 0);
                if (changed) {
                        mode = ce_mode_from_stat(ce, st.st_mode);
-                       sha1 = no_sha1;
+                       sha1 = null_sha1;
                }
        }
 
@@ -514,7 +513,7 @@ static void show_new_file(struct rev_info *revs,
                          struct cache_entry *new,
                          int cached, int match_missing)
 {
-       unsigned char *sha1;
+       const unsigned char *sha1;
        unsigned int mode;
 
        /* New file in the index: it might actually be different in
@@ -533,7 +532,7 @@ static int show_modified(struct rev_info *revs,
                         int cached, int match_missing)
 {
        unsigned int mode, oldmode;
-       unsigned char *sha1;
+       const unsigned char *sha1;
 
        if (get_stat_data(new, &sha1, &mode, cached, match_missing) < 0) {
                if (report_missing)
@@ -737,7 +736,8 @@ int run_diff_index(struct rev_info *revs, int cached)
        opts.unpack_data = revs;
 
        init_tree_desc(&t, tree->buffer, tree->size);
-       unpack_trees(1, &t, &opts);
+       if (unpack_trees(1, &t, &opts))
+               exit(128);
 
        diffcore_std(&revs->diffopt);
        diff_flush(&revs->diffopt);
@@ -789,6 +789,7 @@ int do_diff_cache(const unsigned char *tree_sha1, struct diff_options *opt)
        opts.unpack_data = &revs;
 
        init_tree_desc(&t, tree->buffer, tree->size);
-       unpack_trees(1, &t, &opts);
+       if (unpack_trees(1, &t, &opts))
+               exit(128);
        return 0;
 }