interpret-trailers: access trailer_info with new helpers

Instead of directly accessing trailer_info members, access them
indirectly through new helper functions exposed by the trailer API.

This is the first of two preparatory commits which will allow us to
use the so-called "pimpl" (pointer to implementation) idiom for the
trailer API, by making the trailer_info struct private to the trailer
implementation (and thus hidden from the API).

Helped-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Linus Arver <linus@ucla.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

3 files changed, 31 insertions, 6 deletions

diff --git a/builtin/interpret-trailers.c b/builtin/interpret-trailers.c
index 11f4ce9e4a..f3240682e3 100644
--- a/builtin/interpret-trailers.c
+++ b/builtin/interpret-trailers.c
@@ -141,7 +141,7 @@ static void interpret_trailers(const struct process_trailer_options *opts,
 	LIST_HEAD(head);
 	struct strbuf sb = STRBUF_INIT;
 	struct strbuf trailer_block = STRBUF_INIT;
-	struct trailer_info info;
+	struct trailer_info *info = trailer_info_new();
 	FILE *outfile = stdout;
 
 	trailer_config_init();
@@ -151,13 +151,13 @@ static void interpret_trailers(const struct process_trailer_options *opts,
 	if (opts->in_place)
 		outfile = create_in_place_tempfile(file);
 
-	parse_trailers(opts, &info, sb.buf, &head);
+	parse_trailers(opts, info, sb.buf, &head);
 
 	/* Print the lines before the trailers */
 	if (!opts->only_trailers)
-		fwrite(sb.buf, 1, info.trailer_block_start, outfile);
+		fwrite(sb.buf, 1, trailer_block_start(info), outfile);
 
-	if (!opts->only_trailers && !info.blank_line_before_trailer)
+	if (!opts->only_trailers && !blank_line_before_trailer_block(info))
 		fprintf(outfile, "\n");
 
 
@@ -178,8 +178,8 @@ static void interpret_trailers(const struct process_trailer_options *opts,
 
 	/* Print the lines after the trailers as is */
 	if (!opts->only_trailers)
-		fwrite(sb.buf + info.trailer_block_end, 1, sb.len - info.trailer_block_end, outfile);
-	trailer_info_release(&info);
+		fwrite(sb.buf + trailer_block_end(info), 1, sb.len - trailer_block_end(info), outfile);
+	trailer_info_release(info);
 
 	if (opts->in_place)
 		if (rename_tempfile(&trailers_tempfile, file))
diff --git a/trailer.c b/trailer.c
index 4700c44144..95b4c9b8f1 100644
--- a/trailer.c
+++ b/trailer.c
@@ -952,6 +952,12 @@ static void unfold_value(struct strbuf *val)
 	strbuf_release(&out);
 }
 
+struct trailer_info *trailer_info_new(void)
+{
+	struct trailer_info *info = xcalloc(1, sizeof(*info));
+	return info;
+}
+
 /*
  * Parse trailers in "str", populating the trailer info and "head"
  * linked list structure.
@@ -1000,6 +1006,21 @@ void free_trailers(struct list_head *trailers)
 	}
 }
 
+size_t trailer_block_start(struct trailer_info *info)
+{
+	return info->trailer_block_start;
+}
+
+size_t trailer_block_end(struct trailer_info *info)
+{
+	return info->trailer_block_end;
+}
+
+int blank_line_before_trailer_block(struct trailer_info *info)
+{
+	return info->blank_line_before_trailer;
+}
+
 void trailer_info_get(const struct process_trailer_options *opts,
 		      const char *str,
 		      struct trailer_info *info)
diff --git a/trailer.h b/trailer.h
index 7e36da7d13..9ba9672139 100644
--- a/trailer.h
+++ b/trailer.h
@@ -97,6 +97,10 @@ void parse_trailers(const struct process_trailer_options *,
 void trailer_info_get(const struct process_trailer_options *,
 		      const char *str,
 		      struct trailer_info *);
+size_t trailer_block_start(struct trailer_info *);
+size_t trailer_block_end(struct trailer_info *);
+int blank_line_before_trailer_block(struct trailer_info *);
+struct trailer_info *trailer_info_new(void);
 
 void trailer_info_release(struct trailer_info *info);