combine-diff: Fix path quoting

Earlier when showing combined diff, the filenames on the ---/+++
header lines were quoted incorrectly.  a/ (or b/) prefix was
output literally and then the path was output, with c-quoting.

This fixes the quoting logic, and while at it, adjusts the code
to use the customizable prefix (a_prefix and b_prefix)
introduced recently.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/combine-diff.c b/combine-diff.c
index e22db8993286a3b3654865d765c9e98f3604b44a..7d710334ffa9ce4fa82145f4b1745d048635c475 100644 (file)
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -646,12 +646,28 @@ static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
        sline->p_lno[i] = sline->p_lno[j];
 }
 
-static void dump_quoted_path(const char *prefix, const char *path,
+static void dump_quoted_path(const char *head,
+                            const char *prefix,
+                            const char *path,
                             const char *c_meta, const char *c_reset)
 {
-       printf("%s%s", c_meta, prefix);
-       quote_c_style(path, NULL, stdout, 0);
-       printf("%s\n", c_reset);
+       static struct strbuf buf = STRBUF_INIT;
+
+       strbuf_reset(&buf);
+       strbuf_addstr(&buf, c_meta);
+       strbuf_addstr(&buf, head);
+       if (quote_c_style(prefix, NULL, NULL, 0) ||
+           quote_c_style(path, NULL, NULL, 0)) {
+               strbuf_addch(&buf, '"');
+               quote_c_style(prefix, &buf, NULL, 1);
+               quote_c_style(path, &buf, NULL, 1);
+               strbuf_addch(&buf, '"');
+       } else {
+               strbuf_addstr(&buf, prefix);
+               strbuf_addstr(&buf, path);
+       }
+       strbuf_addstr(&buf, c_reset);
+       puts(buf.buf);
 }
 
 static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
@@ -793,7 +809,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
                if (rev->loginfo && !rev->no_commit_id)
                        show_log(rev, opt->msg_sep);
                dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
-                                elem->path, c_meta, c_reset);
+                                "", elem->path, c_meta, c_reset);
                printf("%sindex ", c_meta);
                for (i = 0; i < num_parent; i++) {
                        abb = find_unique_abbrev(elem->parent[i].sha1,
@@ -829,14 +845,19 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
                        printf("%s\n", c_reset);
                }
                if (added)
-                       dump_quoted_path("--- /dev/", "null", c_meta, c_reset);
+                       dump_quoted_path("--- ", "", "/dev/null",
+                                        c_meta, c_reset);
                else
-                       dump_quoted_path("--- a/", elem->path, c_meta, c_reset);
+                       dump_quoted_path("--- ", opt->a_prefix, elem->path,
+                                        c_meta, c_reset);
                if (deleted)
-                       dump_quoted_path("+++ /dev/", "null", c_meta, c_reset);
+                       dump_quoted_path("+++ ", "", "/dev/null",
+                                        c_meta, c_reset);
                else
-                       dump_quoted_path("+++ b/", elem->path, c_meta, c_reset);
-               dump_sline(sline, cnt, num_parent, DIFF_OPT_TST(opt, COLOR_DIFF));
+                       dump_quoted_path("+++ ", opt->b_prefix, elem->path,
+                                        c_meta, c_reset);
+               dump_sline(sline, cnt, num_parent,
+                          DIFF_OPT_TST(opt, COLOR_DIFF));
        }
        free(result);