Subject: [PATCH v2 06/31] mailinfo: get rid of function-local static states

From: Junio C Hamano <[email-masked]>
Date: Wed, 14 Oct 2015 13:45:32 -0700

Two helper functions use "static int" in their scope to keep track
of the state while repeatedly getting called once for each input
line.  Move these state variables their ultimate caller and pass
down pointers to them, as a small step in preparation for making
this entire callchain more reentrant.

Signed-off-by: Junio C Hamano <[email-masked]>
---
 builtin/mailinfo.c | 41 +++++++++++++++++++----------------------
 1 file changed, 19 insertions(+), 22 deletions(-)

diff --git a/builtin/mailinfo.c b/builtin/mailinfo.c
index 2b7f97b..1518708 100644
--- a/builtin/mailinfo.c
+++ b/builtin/mailinfo.c
@@ -713,27 +713,25 @@ static int is_scissors_line(const struct strbuf *line)
 		gap * 2 < perforation);
 }
 
-static int handle_commit_msg(struct strbuf *line)
+static int handle_commit_msg(struct strbuf *line, int *still_looking)
 {
-	static int still_looking = 1;
-
 	if (!cmitmsg)
 		return 0;
 
-	if (still_looking) {
+	if (*still_looking) {
 		if (!line->len || (line->len == 1 && line->buf[0] == '\n'))
 			return 0;
 	}
 
-	if (use_inbody_headers && still_looking) {
-		still_looking = check_header(line, s_hdr_data, 0);
-		if (still_looking)
+	if (use_inbody_headers && *still_looking) {
+		*still_looking = check_header(line, s_hdr_data, 0);
+		if (*still_looking)
 			return 0;
 	} else
 		/* Only trim the first (blank) line of the commit message
 		 * when ignoring in-body headers.
 		 */
-		still_looking = 0;
+		*still_looking = 0;
 
 	/* normalize the log message to UTF-8. */
 	if (metainfo_charset)
@@ -745,7 +743,7 @@ static int handle_commit_msg(struct strbuf *line)
 			die_errno("Could not rewind output message file");
 		if (ftruncate(fileno(cmitmsg), 0))
 			die_errno("Could not truncate output message file at scissors");
-		still_looking = 1;
+		*still_looking = 1;
 
 		/*
 		 * We may have already read "secondary headers"; purge
@@ -777,16 +775,13 @@ static void handle_patch(const struct strbuf *line)
 	patch_lines++;
 }
 
-static void handle_filter(struct strbuf *line)
+static void handle_filter(struct strbuf *line, int *filter_stage, int *header_stage)
 {
-	static int filter = 0;
-
-	/* filter tells us which part we left off on */
-	switch (filter) {
+	switch (*filter_stage) {
 	case 0:
-		if (!handle_commit_msg(line))
+		if (!handle_commit_msg(line, header_stage))
 			break;
-		filter++;
+		(*filter_stage)++;
 	case 1:
 		handle_patch(line);
 		break;
@@ -802,7 +797,7 @@ static int find_boundary(void)
 	return 0;
 }
 
-static int handle_boundary(void)
+static int handle_boundary(int *filter_stage, int *header_stage)
 {
 	struct strbuf newline = STRBUF_INIT;
 
@@ -824,7 +819,7 @@ again:
 					"can't recover\n");
 			exit(1);
 		}
-		handle_filter(&newline);
+		handle_filter(&newline, filter_stage, header_stage);
 		strbuf_release(&newline);
 
 		/* skip to the next boundary */
@@ -852,6 +847,8 @@ again:
 static void handle_body(void)
 {
 	struct strbuf prev = STRBUF_INIT;
+	int filter_stage = 0;
+	int header_stage = 1;
 
 	/* Skip up to the first boundary */
 	if (*content_top) {
@@ -864,10 +861,10 @@ static void handle_body(void)
 		if (*content_top && is_multipart_boundary(&line)) {
 			/* flush any leftover */
 			if (prev.len) {
-				handle_filter(&prev);
+				handle_filter(&prev, &filter_stage, &header_stage);
 				strbuf_reset(&prev);
 			}
-			if (!handle_boundary())
+			if (!handle_boundary(&filter_stage, &header_stage))
 				goto handle_body_out;
 		}
 
@@ -897,7 +894,7 @@ static void handle_body(void)
 						strbuf_addbuf(&prev, sb);
 						break;
 					}
-				handle_filter(sb);
+				handle_filter(sb, &filter_stage, &header_stage);
 			}
 			/*
 			 * The partial chunk is saved in "prev" and will be
@@ -907,7 +904,7 @@ static void handle_body(void)
 			break;
 		}
 		default:
-			handle_filter(&line);
+			handle_filter(&line, &filter_stage, &header_stage);
 		}
 
 	} while (!strbuf_getwholeline(&line, fin, '\n'));
-- 
2.6.1-320-g86a1181