Previously, we did a lot of arithmetic gymnastics to get at the line in
the todo list (as stored in todo_list.buf). This might have been fast,
but only in terms of execution speed, not in terms of developer time.
Let's refactor this to make it a lot easier to read, and hence to
reason about the correctness of the code. It is not performance-critical
code anyway.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
sequencer.c | 60 ++++++++++++++++++++++++++++++++---------------------
1 file changed, 36 insertions(+), 24 deletions(-)
diff --git a/sequencer.c b/sequencer.c
index 1ee70d843c1..3d0a45ab25a 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1870,6 +1870,23 @@ static int count_commands(struct todo_list *todo_list)
return count;
}
+static int get_item_line_offset(struct todo_list *todo_list, int index)
+{
+ return index < todo_list->nr ?
+ todo_list->items[index].offset_in_buf : todo_list->buf.len;
+}
+
+static const char *get_item_line(struct todo_list *todo_list, int index)
+{
+ return todo_list->buf.buf + get_item_line_offset(todo_list, index);
+}
+
+static int get_item_line_length(struct todo_list *todo_list, int index)
+{
+ return get_item_line_offset(todo_list, index + 1)
+ - get_item_line_offset(todo_list, index);
+}
+
static ssize_t strbuf_read_file_or_whine(struct strbuf *sb, const char *path)
{
int fd;
@@ -2244,29 +2261,27 @@ static int save_todo(struct todo_list *todo_list, struct replay_opts *opts)
fd = hold_lock_file_for_update(&todo_lock, todo_path, 0);
if (fd < 0)
return error_errno(_("could not lock '%s'"), todo_path);
- offset = next < todo_list->nr ?
- todo_list->items[next].offset_in_buf : todo_list->buf.len;
+ offset = get_item_line_offset(todo_list, next);
if (write_in_full(fd, todo_list->buf.buf + offset,
todo_list->buf.len - offset) < 0)
return error_errno(_("could not write to '%s'"), todo_path);
if (commit_lock_file(&todo_lock) < 0)
return error(_("failed to finalize '%s'"), todo_path);
- if (is_rebase_i(opts)) {
- const char *done_path = rebase_path_done();
- int fd = open(done_path, O_CREAT | O_WRONLY | O_APPEND, 0666);
- int prev_offset = !next ? 0 :
- todo_list->items[next - 1].offset_in_buf;
+ if (is_rebase_i(opts) && next > 0) {
+ const char *done = rebase_path_done();
+ int fd = open(done, O_CREAT | O_WRONLY | O_APPEND, 0666);
+ int ret = 0;
- if (fd >= 0 && offset > prev_offset &&
- write_in_full(fd, todo_list->buf.buf + prev_offset,
- offset - prev_offset) < 0) {
- close(fd);
- return error_errno(_("could not write to '%s'"),
- done_path);
- }
- if (fd >= 0)
- close(fd);
+ if (fd < 0)
+ return 0;
+ if (write_in_full(fd, get_item_line(todo_list, next - 1),
+ get_item_line_length(todo_list, next - 1))
+ < 0)
+ ret = error_errno(_("could not write to '%s'"), done);
+ if (close(fd) < 0)
+ ret = error_errno(_("failed to finalize '%s'"), done);
+ return ret;
}
return 0;
}
@@ -3297,8 +3312,7 @@ int skip_unnecessary_picks(void)
oid = &item->commit->object.oid;
}
if (i > 0) {
- int offset = i < todo_list.nr ?
- todo_list.items[i].offset_in_buf : todo_list.buf.len;
+ int offset = get_item_line_offset(&todo_list, i);
const char *done_path = rebase_path_done();
fd = open(done_path, O_CREAT | O_WRONLY | O_APPEND, 0666);
@@ -3478,12 +3492,10 @@ int rearrange_squash(void)
continue;
while (cur >= 0) {
- int offset = todo_list.items[cur].offset_in_buf;
- int end_offset = cur + 1 < todo_list.nr ?
- todo_list.items[cur + 1].offset_in_buf :
- todo_list.buf.len;
- char *bol = todo_list.buf.buf + offset;
- char *eol = todo_list.buf.buf + end_offset;
+ const char *bol =
+ get_item_line(&todo_list, cur);
+ const char *eol =
+ get_item_line(&todo_list, cur + 1);
/* replace 'pick', by 'fixup' or 'squash' */
command = todo_list.items[cur].command;
--
2.17.0.windows.1.15.gaa56ade3205
