strbuf: introduce strbuf_getline_{lf,nul}()

The strbuf_getline() interface allows a byte other than LF or NUL as
the line terminator, but this is only because I wrote these
codepaths anticipating that there might be a value other than NUL
and LF that could be useful when I introduced line_termination long
time ago.  No useful caller that uses other value has emerged.

By now, it is clear that the interface is overly broad without a
good reason.  Many codepaths have hardcoded preference to read
either LF terminated or NUL terminated records from their input, and
then call strbuf_getline() with LF or NUL as the third parameter.

This step introduces two thin wrappers around strbuf_getline(),
namely, strbuf_getline_lf() and strbuf_getline_nul(), and
mechanically rewrites these call sites to call either one of
them.  The changes contained in this patch are:

 * introduction of these two functions in strbuf.[ch]

 * mechanical conversion of all callers to strbuf_getline() with
   either '\n' or '\0' as the third parameter to instead call the
   respective thin wrapper.

After this step, output from "git grep 'strbuf_getline('" would
become a lot smaller.  An interim goal of this series is to make
this an empty set, so that we can have strbuf_getline_crlf() take
over the shorter name strbuf_getline().

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

1 files changed, 1 insertions, 1 deletions

diff --git a/sequencer.c b/sequencer.c
index 8c58fa2f4d..80487860c8 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -886,7 +886,7 @@ static int sequencer_rollback(struct replay_opts *opts)
 	if (!f)
 		return error(_("cannot open %s: %s"), git_path_head_file(),
 						strerror(errno));
-	if (strbuf_getline(&buf, f, '\n')) {
+	if (strbuf_getline_lf(&buf, f)) {
 		error(_("cannot read %s: %s"), git_path_head_file(),
 		      ferror(f) ?  strerror(errno) : _("unexpected end of file"));
 		fclose(f);