commit: make ignore_non_trailer take buf/len

Make ignore_non_trailer take a buf/len pair instead of struct strbuf.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/commit.c

@@ -790,7 +790,7 @@ static int prepare_to_commit(const char *index_file, const char *prefix,
 		strbuf_stripspace(&sb, 0);
 
 	if (signoff)
-		append_signoff(&sb, ignore_non_trailer(&sb), 0);
+		append_signoff(&sb, ignore_non_trailer(sb.buf, sb.len), 0);
 
 	if (fwrite(sb.buf, 1, sb.len, s->fp) < sb.len)
 		die_errno(_("could not write commit template"));

commit.c

@@ -1649,7 +1649,7 @@ const char *find_commit_header(const char *msg, const char *key, size_t *out_len
 }
 
 /*
- * Inspect sb and determine the true "end" of the log message, in
+ * Inspect the given string and determine the true "end" of the log message, in
  * order to find where to put a new Signed-off-by: line.  Ignored are
  * trailing comment lines and blank lines, and also the traditional
  * "Conflicts:" block that is not commented out, so that we can use
@@ -1659,37 +1659,37 @@ const char *find_commit_header(const char *msg, const char *key, size_t *out_len
  * Returns the number of bytes from the tail to ignore, to be fed as
  * the second parameter to append_signoff().
  */
-int ignore_non_trailer(struct strbuf *sb)
+int ignore_non_trailer(const char *buf, size_t len)
 {
 	int boc = 0;
 	int bol = 0;
 	int in_old_conflicts_block = 0;
 
-	while (bol < sb->len) {
-		char *next_line;
+	while (bol < len) {
+		const char *next_line = memchr(buf + bol, '\n', len - bol);
 
-		if (!(next_line = memchr(sb->buf + bol, '\n', sb->len - bol)))
-			next_line = sb->buf + sb->len;
+		if (!next_line)
+			next_line = buf + len;
 		else
 			next_line++;
 
-		if (sb->buf[bol] == comment_line_char || sb->buf[bol] == '\n') {
+		if (buf[bol] == comment_line_char || buf[bol] == '\n') {
 			/* is this the first of the run of comments? */
 			if (!boc)
 				boc = bol;
 			/* otherwise, it is just continuing */
-		} else if (starts_with(sb->buf + bol, "Conflicts:\n")) {
+		} else if (starts_with(buf + bol, "Conflicts:\n")) {
 			in_old_conflicts_block = 1;
 			if (!boc)
 				boc = bol;
-		} else if (in_old_conflicts_block && sb->buf[bol] == '\t') {
+		} else if (in_old_conflicts_block && buf[bol] == '\t') {
 			; /* a pathname in the conflicts block */
 		} else if (boc) {
 			/* the previous was not trailing comment */
 			boc = 0;
 			in_old_conflicts_block = 0;
 		}
-		bol = next_line - sb->buf;
+		bol = next_line - buf;
 	}
-	return boc ? sb->len - boc : 0;
+	return boc ? len - boc : 0;
 }

commit.h

@@ -355,7 +355,7 @@ extern const char *find_commit_header(const char *msg, const char *key,
 				      size_t *out_len);
 
 /* Find the end of the log message, the right place for a new trailer. */
-extern int ignore_non_trailer(struct strbuf *sb);
+extern int ignore_non_trailer(const char *buf, size_t len);
 
 typedef void (*each_mergetag_fn)(struct commit *commit, struct commit_extra_header *extra,
 				 void *cb_data);

trailer.c

@@ -842,7 +842,7 @@ static int find_trailer_end(struct strbuf **lines, int patch_start)
 
 	for (i = 0; i < patch_start; i++)
 		strbuf_addbuf(&sb, lines[i]);
-	ignore_bytes = ignore_non_trailer(&sb);
+	ignore_bytes = ignore_non_trailer(sb.buf, sb.len);
 	strbuf_release(&sb);
 	for (i = patch_start - 1; i >= 0 && ignore_bytes > 0; i--)
 		ignore_bytes -= lines[i]->len;