Rework pretty_print_commit to use strbufs instead of custom buffers.

  Also remove the "len" parameter, as:
  (1) it was used as a max boundary, and every caller used ~0u
  (2) we check for final NUL no matter what, so it doesn't help for speed.

  As a result most of the pp_* function takes 3 arguments less, and we need
a lot less local variables, this makes the code way more readable, and
easier to extend if needed.

  This patch also fixes some spacing and cosmetic issues.

  This patch also fixes (as a side effect) a memory leak intoruced in
builtin-archive.c at commit df4a394f (fmt was xmalloc'ed and not free'd)

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 19 insertions, 37 deletions

diff --git a/log-tree.c b/log-tree.c
index a6423718e7..3e5e6acfaf 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -79,25 +79,14 @@ static int detect_any_signoff(char *letter, int size)
 	return seen_head && seen_name;
 }
 
-static unsigned long append_signoff(char **buf_p, unsigned long *buf_sz_p,
-				    unsigned long at, const char *signoff)
+static void append_signoff(struct strbuf *sb, const char *signoff)
 {
 	static const char signed_off_by[] = "Signed-off-by: ";
 	size_t signoff_len = strlen(signoff);
 	int has_signoff = 0;
 	char *cp;
-	char *buf;
-	unsigned long buf_sz;
-
-	buf = *buf_p;
-	buf_sz = *buf_sz_p;
-	if (buf_sz <= at + strlen(signed_off_by) + signoff_len + 3) {
-		buf_sz += strlen(signed_off_by) + signoff_len + 3;
-		buf = xrealloc(buf, buf_sz);
-		*buf_p = buf;
-		*buf_sz_p = buf_sz;
-	}
-	cp = buf;
+
+	cp = sb->buf;
 
 	/* First see if we already have the sign-off by the signer */
 	while ((cp = strstr(cp, signed_off_by))) {
@@ -105,29 +94,25 @@ static unsigned long append_signoff(char **buf_p, unsigned long *buf_sz_p,
 		has_signoff = 1;
 
 		cp += strlen(signed_off_by);
-		if (cp + signoff_len >= buf + at)
+		if (cp + signoff_len >= sb->buf + sb->len)
 			break;
 		if (strncmp(cp, signoff, signoff_len))
 			continue;
 		if (!isspace(cp[signoff_len]))
 			continue;
 		/* we already have him */
-		return at;
+		return;
 	}
 
 	if (!has_signoff)
-		has_signoff = detect_any_signoff(buf, at);
+		has_signoff = detect_any_signoff(sb->buf, sb->len);
 
 	if (!has_signoff)
-		buf[at++] = '\n';
-
-	strcpy(buf + at, signed_off_by);
-	at += strlen(signed_off_by);
-	strcpy(buf + at, signoff);
-	at += signoff_len;
-	buf[at++] = '\n';
-	buf[at] = 0;
-	return at;
+		strbuf_addch(sb, '\n');
+
+	strbuf_addstr(sb, signed_off_by);
+	strbuf_add(sb, signoff, signoff_len);
+	strbuf_addch(sb, '\n');
 }
 
 static unsigned int digits_in_number(unsigned int number)
@@ -142,14 +127,12 @@ static unsigned int digits_in_number(unsigned int number)
 
 void show_log(struct rev_info *opt, const char *sep)
 {
-	char *msgbuf = NULL;
-	unsigned long msgbuf_len = 0;
+	struct strbuf msgbuf;
 	struct log_info *log = opt->loginfo;
 	struct commit *commit = log->commit, *parent = log->parent;
 	int abbrev = opt->diffopt.abbrev;
 	int abbrev_commit = opt->abbrev_commit ? opt->abbrev : 40;
 	const char *extra;
-	int len;
 	const char *subject = NULL, *extra_headers = opt->extra_headers;
 
 	opt->loginfo = NULL;
@@ -288,18 +271,17 @@ void show_log(struct rev_info *opt, const char *sep)
 	/*
 	 * And then the pretty-printed message itself
 	 */
-	len = pretty_print_commit(opt->commit_format, commit, ~0u,
-				  &msgbuf, &msgbuf_len, abbrev, subject,
-				  extra_headers, opt->date_mode);
+	strbuf_init(&msgbuf, 0);
+	pretty_print_commit(opt->commit_format, commit, &msgbuf,
+				  abbrev, subject, extra_headers, opt->date_mode);
 
 	if (opt->add_signoff)
-		len = append_signoff(&msgbuf, &msgbuf_len, len,
-				     opt->add_signoff);
+		append_signoff(&msgbuf, opt->add_signoff);
 	if (opt->show_log_size)
-		printf("log size %i\n", len);
+		printf("log size %i\n", (int)msgbuf.len);
 
-	printf("%s%s%s", msgbuf, extra, sep);
-	free(msgbuf);
+	printf("%s%s%s", msgbuf.buf, extra, sep);
+	strbuf_release(&msgbuf);
 }
 
 int log_tree_diff_flush(struct rev_info *opt)