X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=blobdiff_plain;f=commit.c;h=f86fa776c05b27d0e353cc70ee2b49d29a8de2e7;hb=182af8343c307436bb5364309aa6d4d46fa5911d;hp=4ca4d44ba0d648c6c102ac17160b69f6f0f02836;hpb=f26cacf4956b08238868b21a8eac6b5e51a17d7f;p=git.git

diff --git a/commit.c b/commit.c
index 4ca4d44ba..f86fa776c 100644
--- a/commit.c
+++ b/commit.c
@@ -27,7 +27,7 @@ struct sort_node
 
 const char *commit_type = "commit";
 
-struct cmt_fmt_map {
+static struct cmt_fmt_map {
 	const char *n;
 	size_t cmp_len;
 	enum cmit_fmt v;
@@ -458,11 +458,11 @@ void clear_commit_marks(struct commit *commit, unsigned int mark)
 /*
  * Generic support for pretty-printing the header
  */
-static int get_one_line(const char *msg, unsigned long len)
+static int get_one_line(const char *msg)
 {
 	int ret = 0;
 
-	while (len--) {
+	for (;;) {
 		char c = *msg++;
 		if (!c)
 			break;
@@ -485,31 +485,25 @@ static int is_rfc2047_special(char ch)
 	return (non_ascii(ch) || (ch == '=') || (ch == '?') || (ch == '_'));
 }
 
-static int add_rfc2047(char *buf, const char *line, int len,
+static void add_rfc2047(struct strbuf *sb, const char *line, int len,
 		       const char *encoding)
 {
-	char *bp = buf;
-	int i, needquote;
-	char q_encoding[128];
-	const char *q_encoding_fmt = "=?%s?q?";
+	int i, last;
 
-	for (i = needquote = 0; !needquote && i < len; i++) {
+	for (i = 0; i < len; i++) {
 		int ch = line[i];
 		if (non_ascii(ch))
-			needquote++;
-		if ((i + 1 < len) &&
-		    (ch == '=' && line[i+1] == '?'))
-			needquote++;
+			goto needquote;
+		if ((i + 1 < len) && (ch == '=' && line[i+1] == '?'))
+			goto needquote;
 	}
-	if (!needquote)
-		return sprintf(buf, "%.*s", len, line);
-
-	i = snprintf(q_encoding, sizeof(q_encoding), q_encoding_fmt, encoding);
-	if (sizeof(q_encoding) < i)
-		die("Insanely long encoding name %s", encoding);
-	memcpy(bp, q_encoding, i);
-	bp += i;
-	for (i = 0; i < len; i++) {
+	strbuf_add(sb, line, len);
+	return;
+
+needquote:
+	strbuf_grow(sb, len * 3 + strlen(encoding) + 100);
+	strbuf_addf(sb, "=?%s?q?", encoding);
+	for (i = last = 0; i < len; i++) {
 		unsigned ch = line[i] & 0xFF;
 		/*
 		 * We encode ' ' using '=20' even though rfc2047
@@ -518,32 +512,30 @@ static int add_rfc2047(char *buf, const char *line, int len,
 		 * leave the underscore in place.
 		 */
 		if (is_rfc2047_special(ch) || ch == ' ') {
-			sprintf(bp, "=%02X", ch);
-			bp += 3;
+			strbuf_add(sb, line + last, i - last);
+			strbuf_addf(sb, "=%02X", ch);
+			last = i + 1;
 		}
-		else
-			*bp++ = ch;
 	}
-	memcpy(bp, "?=", 2);
-	bp += 2;
-	return bp - buf;
+	strbuf_add(sb, line + last, len - last);
+	strbuf_addstr(sb, "?=");
 }
 
-static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
+static void add_user_info(const char *what, enum cmit_fmt fmt, struct strbuf *sb,
 			 const char *line, enum date_mode dmode,
 			 const char *encoding)
 {
 	char *date;
 	int namelen;
 	unsigned long time;
-	int tz, ret;
+	int tz;
 	const char *filler = "    ";
 
 	if (fmt == CMIT_FMT_ONELINE)
-		return 0;
+		return;
 	date = strchr(line, '>');
 	if (!date)
-		return 0;
+		return;
 	namelen = ++date - line;
 	time = strtoul(date, &date, 10);
 	tz = strtol(date, NULL, 10);
@@ -552,42 +544,34 @@ static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf,
 		char *name_tail = strchr(line, '<');
 		int display_name_length;
 		if (!name_tail)
-			return 0;
+			return;
 		while (line < name_tail && isspace(name_tail[-1]))
 			name_tail--;
 		display_name_length = name_tail - line;
 		filler = "";
-		strcpy(buf, "From: ");
-		ret = strlen(buf);
-		ret += add_rfc2047(buf + ret, line, display_name_length,
-				   encoding);
-		memcpy(buf + ret, name_tail, namelen - display_name_length);
-		ret += namelen - display_name_length;
-		buf[ret++] = '\n';
-	}
-	else {
-		ret = sprintf(buf, "%s: %.*s%.*s\n", what,
+		strbuf_addstr(sb, "From: ");
+		add_rfc2047(sb, line, display_name_length, encoding);
+		strbuf_add(sb, name_tail, namelen - display_name_length);
+		strbuf_addch(sb, '\n');
+	} else {
+		strbuf_addf(sb, "%s: %.*s%.*s\n", what,
 			      (fmt == CMIT_FMT_FULLER) ? 4 : 0,
 			      filler, namelen, line);
 	}
 	switch (fmt) {
 	case CMIT_FMT_MEDIUM:
-		ret += sprintf(buf + ret, "Date:   %s\n",
-			       show_date(time, tz, dmode));
+		strbuf_addf(sb, "Date:   %s\n", show_date(time, tz, dmode));
 		break;
 	case CMIT_FMT_EMAIL:
-		ret += sprintf(buf + ret, "Date: %s\n",
-			       show_rfc2822_date(time, tz));
+		strbuf_addf(sb, "Date: %s\n", show_date(time, tz, DATE_RFC2822));
 		break;
 	case CMIT_FMT_FULLER:
-		ret += sprintf(buf + ret, "%sDate: %s\n", what,
-			       show_date(time, tz, dmode));
+		strbuf_addf(sb, "%sDate: %s\n", what, show_date(time, tz, dmode));
 		break;
 	default:
 		/* notin' */
 		break;
 	}
-	return ret;
 }
 
 static int is_empty_line(const char *line, int *len_p)
@@ -599,16 +583,16 @@ static int is_empty_line(const char *line, int *len_p)
 	return !len;
 }
 
-static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
+static void add_merge_info(enum cmit_fmt fmt, struct strbuf *sb,
+			const struct commit *commit, int abbrev)
 {
 	struct commit_list *parent = commit->parents;
-	int offset;
 
 	if ((fmt == CMIT_FMT_ONELINE) || (fmt == CMIT_FMT_EMAIL) ||
 	    !parent || !parent->next)
-		return 0;
+		return;
 
-	offset = sprintf(buf, "Merge:");
+	strbuf_addstr(sb, "Merge:");
 
 	while (parent) {
 		struct commit *p = parent->item;
@@ -621,10 +605,9 @@ static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *com
 		dots = (abbrev && strlen(hex) != 40) ?  "..." : "";
 		parent = parent->next;
 
-		offset += sprintf(buf + offset, " %s%s", hex, dots);
+		strbuf_addf(sb, " %s%s", hex, dots);
 	}
-	buf[offset++] = '\n';
-	return offset;
+	strbuf_addch(sb, '\n');
 }
 
 static char *get_header(const struct commit *commit, const char *key)
@@ -645,11 +628,7 @@ static char *get_header(const struct commit *commit, const char *key)
 		if (eol - line > key_len &&
 		    !strncmp(line, key, key_len) &&
 		    line[key_len] == ' ') {
-			int len = eol - line - key_len;
-			char *ret = xmalloc(len);
-			memcpy(ret, line + key_len + 1, len - 1);
-			ret[len - 1] = '\0';
-			return ret;
+			return xmemdupz(line + key_len + 1, eol - line - key_len - 1);
 		}
 		line = next;
 	}
@@ -657,47 +636,34 @@ static char *get_header(const struct commit *commit, const char *key)
 
 static char *replace_encoding_header(char *buf, const char *encoding)
 {
-	char *encoding_header = strstr(buf, "\nencoding ");
-	char *header_end = strstr(buf, "\n\n");
-	char *end_of_encoding_header;
-	int encoding_header_pos;
-	int encoding_header_len;
-	int new_len;
-	int need_len;
-	int buflen = strlen(buf) + 1;
-
-	if (!header_end)
-		header_end = buf + buflen;
-	if (!encoding_header || encoding_header >= header_end)
-		return buf;
-	encoding_header++;
-	end_of_encoding_header = strchr(encoding_header, '\n');
-	if (!end_of_encoding_header)
+	struct strbuf tmp;
+	size_t start, len;
+	char *cp = buf;
+
+	/* guess if there is an encoding header before a \n\n */
+	while (strncmp(cp, "encoding ", strlen("encoding "))) {
+		cp = strchr(cp, '\n');
+		if (!cp || *++cp == '\n')
+			return buf;
+	}
+	start = cp - buf;
+	cp = strchr(cp, '\n');
+	if (!cp)
 		return buf; /* should not happen but be defensive */
-	end_of_encoding_header++;
-
-	encoding_header_len = end_of_encoding_header - encoding_header;
-	encoding_header_pos = encoding_header - buf;
+	len = cp + 1 - (buf + start);
 
+	strbuf_init(&tmp, 0);
+	strbuf_attach(&tmp, buf, strlen(buf), strlen(buf) + 1);
 	if (is_encoding_utf8(encoding)) {
 		/* we have re-coded to UTF-8; drop the header */
-		memmove(encoding_header, end_of_encoding_header,
-			buflen - (encoding_header_pos + encoding_header_len));
-		return buf;
+		strbuf_splice(&tmp, start, len, NULL, 0);
+	} else {
+		/* just replaces XXXX in 'encoding XXXX\n' */
+		strbuf_splice(&tmp, start + strlen("encoding "),
+					  len - strlen("encoding \n"),
+					  encoding, strlen(encoding));
 	}
-	new_len = strlen(encoding);
-	need_len = new_len + strlen("encoding \n");
-	if (encoding_header_len < need_len) {
-		buf = xrealloc(buf, buflen + (need_len - encoding_header_len));
-		encoding_header = buf + encoding_header_pos;
-		end_of_encoding_header = encoding_header + encoding_header_len;
-	}
-	memmove(end_of_encoding_header + (need_len - encoding_header_len),
-		end_of_encoding_header,
-		buflen - (encoding_header_pos + encoding_header_len));
-	memcpy(encoding_header + 9, encoding, strlen(encoding));
-	encoding_header[9 + new_len] = '\n';
-	return buf;
+	return tmp.buf;
 }
 
 static char *logmsg_reencode(const struct commit *commit,
@@ -713,7 +679,10 @@ static char *logmsg_reencode(const struct commit *commit,
 	encoding = get_header(commit, "encoding");
 	use_encoding = encoding ? encoding : utf8;
 	if (!strcmp(use_encoding, output_encoding))
-		out = xstrdup(commit->buffer);
+		if (encoding) /* we'll strip encoding header later */
+			out = xstrdup(commit->buffer);
+		else
+			return NULL; /* nothing to do */
 	else
 		out = reencode_string(commit->buffer,
 				      output_encoding, use_encoding);
@@ -736,7 +705,7 @@ static void fill_person(struct interp *table, const char *msg, int len)
 	start = end + 1;
 	while (end > 0 && isspace(msg[end - 1]))
 		end--;
-	table[0].value = xstrndup(msg, end);
+	table[0].value = xmemdupz(msg, end);
 
 	if (start >= len)
 		return;
@@ -748,7 +717,7 @@ static void fill_person(struct interp *table, const char *msg, int len)
 	if (end >= len)
 		return;
 
-	table[1].value = xstrndup(msg + start, end - start);
+	table[1].value = xmemdupz(msg + start, end - start);
 
 	/* parse date */
 	for (start = end + 1; start < len && isspace(msg[start]); start++)
@@ -759,7 +728,7 @@ static void fill_person(struct interp *table, const char *msg, int len)
 	if (msg + start == ep)
 		return;
 
-	table[5].value = xstrndup(msg + start, ep - (msg + start));
+	table[5].value = xmemdupz(msg + start, ep - (msg + start));
 
 	/* parse tz */
 	for (start = ep - msg + 1; start < len && isspace(msg[start]); start++)
@@ -770,13 +739,14 @@ static void fill_person(struct interp *table, const char *msg, int len)
 			tz = -tz;
 	}
 
-	interp_set_entry(table, 2, show_date(date, tz, 0));
-	interp_set_entry(table, 3, show_rfc2822_date(date, tz));
-	interp_set_entry(table, 4, show_date(date, tz, 1));
+	interp_set_entry(table, 2, show_date(date, tz, DATE_NORMAL));
+	interp_set_entry(table, 3, show_date(date, tz, DATE_RFC2822));
+	interp_set_entry(table, 4, show_date(date, tz, DATE_RELATIVE));
+	interp_set_entry(table, 6, show_date(date, tz, DATE_ISO8601));
 }
 
-static long format_commit_message(const struct commit *commit,
-		const char *msg, char *buf, unsigned long space)
+void format_commit_message(const struct commit *commit,
+                           const void *format, struct strbuf *sb)
 {
 	struct interp table[] = {
 		{ "%H" },	/* commit hash */
@@ -791,12 +761,14 @@ static long format_commit_message(const struct commit *commit,
 		{ "%aD" },	/* author date, RFC2822 style */
 		{ "%ar" },	/* author date, relative */
 		{ "%at" },	/* author date, UNIX timestamp */
+		{ "%ai" },	/* author date, ISO 8601 */
 		{ "%cn" },	/* committer name */
 		{ "%ce" },	/* committer email */
 		{ "%cd" },	/* committer date */
 		{ "%cD" },	/* committer date, RFC2822 style */
 		{ "%cr" },	/* committer date, relative */
 		{ "%ct" },	/* committer date, UNIX timestamp */
+		{ "%ci" },	/* committer date, ISO 8601 */
 		{ "%e" },	/* encoding */
 		{ "%s" },	/* subject */
 		{ "%b" },	/* body */
@@ -813,10 +785,11 @@ static long format_commit_message(const struct commit *commit,
 		IPARENTS, IPARENTS_ABBREV,
 		IAUTHOR_NAME, IAUTHOR_EMAIL,
 		IAUTHOR_DATE, IAUTHOR_DATE_RFC2822, IAUTHOR_DATE_RELATIVE,
-		IAUTHOR_TIMESTAMP,
+		IAUTHOR_TIMESTAMP, IAUTHOR_ISO8601,
 		ICOMMITTER_NAME, ICOMMITTER_EMAIL,
 		ICOMMITTER_DATE, ICOMMITTER_DATE_RFC2822,
 		ICOMMITTER_DATE_RELATIVE, ICOMMITTER_TIMESTAMP,
+		ICOMMITTER_ISO8601,
 		IENCODING,
 		ISUBJECT,
 		IBODY,
@@ -826,8 +799,10 @@ static long format_commit_message(const struct commit *commit,
 	};
 	struct commit_list *p;
 	char parents[1024];
+	unsigned long len;
 	int i;
 	enum { HEADER, SUBJECT, BODY } state;
+	const char *msg = commit->buffer;
 
 	if (ILEFT_RIGHT + 1 != ARRAY_SIZE(table))
 		die("invalid interp table!");
@@ -880,7 +855,7 @@ static long format_commit_message(const struct commit *commit,
 			; /* do nothing */
 
 		if (state == SUBJECT) {
-			table[ISUBJECT].value = xstrndup(msg + i, eol - i);
+			table[ISUBJECT].value = xmemdupz(msg + i, eol - i);
 			i = eol;
 		}
 		if (i == eol) {
@@ -896,7 +871,7 @@ static long format_commit_message(const struct commit *commit,
 					msg + i + 10, eol - i - 10);
 		else if (!prefixcmp(msg + i, "encoding "))
 			table[IENCODING].value =
-				xstrndup(msg + i + 9, eol - i - 9);
+				xmemdupz(msg + i + 9, eol - i - 9);
 		i = eol;
 	}
 	if (msg[i])
@@ -905,31 +880,183 @@ static long format_commit_message(const struct commit *commit,
 		if (!table[i].value)
 			interp_set_entry(table, i, "<unknown>");
 
-	interpolate(buf, space, user_format, table, ARRAY_SIZE(table));
+	len = interpolate(sb->buf + sb->len, strbuf_avail(sb),
+				format, table, ARRAY_SIZE(table));
+	if (len > strbuf_avail(sb)) {
+		strbuf_grow(sb, len);
+		interpolate(sb->buf + sb->len, strbuf_avail(sb) + 1,
+					format, table, ARRAY_SIZE(table));
+	}
+	strbuf_setlen(sb, sb->len + len);
 	interp_clear_table(table, ARRAY_SIZE(table));
+}
+
+static void pp_header(enum cmit_fmt fmt,
+		      int abbrev,
+		      enum date_mode dmode,
+		      const char *encoding,
+		      const struct commit *commit,
+		      const char **msg_p,
+		      struct strbuf *sb)
+{
+	int parents_shown = 0;
+
+	for (;;) {
+		const char *line = *msg_p;
+		int linelen = get_one_line(*msg_p);
+
+		if (!linelen)
+			return;
+		*msg_p += linelen;
+
+		if (linelen == 1)
+			/* End of header */
+			return;
+
+		if (fmt == CMIT_FMT_RAW) {
+			strbuf_add(sb, line, linelen);
+			continue;
+		}
+
+		if (!memcmp(line, "parent ", 7)) {
+			if (linelen != 48)
+				die("bad parent line in commit");
+			continue;
+		}
+
+		if (!parents_shown) {
+			struct commit_list *parent;
+			int num;
+			for (parent = commit->parents, num = 0;
+			     parent;
+			     parent = parent->next, num++)
+				;
+			/* with enough slop */
+			strbuf_grow(sb, num * 50 + 20);
+			add_merge_info(fmt, sb, commit, abbrev);
+			parents_shown = 1;
+		}
+
+		/*
+		 * MEDIUM == DEFAULT shows only author with dates.
+		 * FULL shows both authors but not dates.
+		 * FULLER shows both authors and dates.
+		 */
+		if (!memcmp(line, "author ", 7)) {
+			strbuf_grow(sb, linelen + 80);
+			add_user_info("Author", fmt, sb, line + 7, dmode, encoding);
+		}
+		if (!memcmp(line, "committer ", 10) &&
+		    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER)) {
+			strbuf_grow(sb, linelen + 80);
+			add_user_info("Commit", fmt, sb, line + 10, dmode, encoding);
+		}
+	}
+}
+
+static void pp_title_line(enum cmit_fmt fmt,
+			  const char **msg_p,
+			  struct strbuf *sb,
+			  const char *subject,
+			  const char *after_subject,
+			  const char *encoding,
+			  int plain_non_ascii)
+{
+	struct strbuf title;
+
+	strbuf_init(&title, 80);
+
+	for (;;) {
+		const char *line = *msg_p;
+		int linelen = get_one_line(line);
+
+		*msg_p += linelen;
+		if (!linelen || is_empty_line(line, &linelen))
+			break;
+
+		strbuf_grow(&title, linelen + 2);
+		if (title.len) {
+			if (fmt == CMIT_FMT_EMAIL) {
+				strbuf_addch(&title, '\n');
+			}
+			strbuf_addch(&title, ' ');
+		}
+		strbuf_add(&title, line, linelen);
+	}
+
+	strbuf_grow(sb, title.len + 1024);
+	if (subject) {
+		strbuf_addstr(sb, subject);
+		add_rfc2047(sb, title.buf, title.len, encoding);
+	} else {
+		strbuf_addbuf(sb, &title);
+	}
+	strbuf_addch(sb, '\n');
+
+	if (plain_non_ascii) {
+		const char *header_fmt =
+			"MIME-Version: 1.0\n"
+			"Content-Type: text/plain; charset=%s\n"
+			"Content-Transfer-Encoding: 8bit\n";
+		strbuf_addf(sb, header_fmt, encoding);
+	}
+	if (after_subject) {
+		strbuf_addstr(sb, after_subject);
+	}
+	if (fmt == CMIT_FMT_EMAIL) {
+		strbuf_addch(sb, '\n');
+	}
+	strbuf_release(&title);
+}
+
+static void pp_remainder(enum cmit_fmt fmt,
+			 const char **msg_p,
+			 struct strbuf *sb,
+			 int indent)
+{
+	int first = 1;
+	for (;;) {
+		const char *line = *msg_p;
+		int linelen = get_one_line(line);
+		*msg_p += linelen;
 
-	return strlen(buf);
+		if (!linelen)
+			break;
+
+		if (is_empty_line(line, &linelen)) {
+			if (first)
+				continue;
+			if (fmt == CMIT_FMT_SHORT)
+				break;
+		}
+		first = 0;
+
+		strbuf_grow(sb, linelen + indent + 20);
+		if (indent) {
+			memset(sb->buf + sb->len, ' ', indent);
+			strbuf_setlen(sb, sb->len + indent);
+		}
+		strbuf_add(sb, line, linelen);
+		strbuf_addch(sb, '\n');
+	}
 }
 
-unsigned long pretty_print_commit(enum cmit_fmt fmt,
-				  const struct commit *commit,
-				  unsigned long len,
-				  char *buf, unsigned long space,
-				  int abbrev, const char *subject,
-				  const char *after_subject,
+void pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit,
+				  struct strbuf *sb, int abbrev,
+				  const char *subject, const char *after_subject,
 				  enum date_mode dmode)
 {
-	int hdr = 1, body = 0, seen_title = 0;
-	unsigned long offset = 0;
+	unsigned long beginning_of_body;
 	int indent = 4;
-	int parents_shown = 0;
 	const char *msg = commit->buffer;
 	int plain_non_ascii = 0;
 	char *reencoded;
 	const char *encoding;
 
-	if (fmt == CMIT_FMT_USERFORMAT)
-		return format_commit_message(commit, msg, buf, space);
+	if (fmt == CMIT_FMT_USERFORMAT) {
+		format_commit_message(commit, user_format, sb);
+		return;
+	}
 
 	encoding = (git_log_output_encoding
 		    ? git_log_output_encoding
@@ -937,8 +1064,9 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
 	if (!encoding)
 		encoding = "utf-8";
 	reencoded = logmsg_reencode(commit, encoding);
-	if (reencoded)
+	if (reencoded) {
 		msg = reencoded;
+	}
 
 	if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
 		indent = 0;
@@ -952,14 +1080,13 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
 	if (fmt == CMIT_FMT_EMAIL && !after_subject) {
 		int i, ch, in_body;
 
-		for (in_body = i = 0; (ch = msg[i]) && i < len; i++) {
+		for (in_body = i = 0; (ch = msg[i]); i++) {
 			if (!in_body) {
 				/* author could be non 7-bit ASCII but
 				 * the log may be so; skip over the
 				 * header part first.
 				 */
-				if (ch == '\n' &&
-				    i + 1 < len && msg[i+1] == '\n')
+				if (ch == '\n' && msg[i+1] == '\n')
 					in_body = 1;
 			}
 			else if (non_ascii(ch)) {
@@ -969,139 +1096,44 @@ unsigned long pretty_print_commit(enum cmit_fmt fmt,
 		}
 	}
 
-	for (;;) {
-		const char *line = msg;
-		int linelen = get_one_line(msg, len);
+	pp_header(fmt, abbrev, dmode, encoding, commit, &msg, sb);
+	if (fmt != CMIT_FMT_ONELINE && !subject) {
+		strbuf_addch(sb, '\n');
+	}
 
+	/* Skip excess blank lines at the beginning of body, if any... */
+	for (;;) {
+		int linelen = get_one_line(msg);
+		int ll = linelen;
 		if (!linelen)
 			break;
-
-		/*
-		 * We want some slop for indentation and a possible
-		 * final "...". Thus the "+ 20".
-		 */
-		if (offset + linelen + 20 > space) {
-			memcpy(buf + offset, "    ...\n", 8);
-			offset += 8;
+		if (!is_empty_line(msg, &ll))
 			break;
-		}
-
 		msg += linelen;
-		len -= linelen;
-		if (hdr) {
-			if (linelen == 1) {
-				hdr = 0;
-				if ((fmt != CMIT_FMT_ONELINE) && !subject)
-					buf[offset++] = '\n';
-				continue;
-			}
-			if (fmt == CMIT_FMT_RAW) {
-				memcpy(buf + offset, line, linelen);
-				offset += linelen;
-				continue;
-			}
-			if (!memcmp(line, "parent ", 7)) {
-				if (linelen != 48)
-					die("bad parent line in commit");
-				continue;
-			}
-
-			if (!parents_shown) {
-				offset += add_merge_info(fmt, buf + offset,
-							 commit, abbrev);
-				parents_shown = 1;
-				continue;
-			}
-			/*
-			 * MEDIUM == DEFAULT shows only author with dates.
-			 * FULL shows both authors but not dates.
-			 * FULLER shows both authors and dates.
-			 */
-			if (!memcmp(line, "author ", 7))
-				offset += add_user_info("Author", fmt,
-							buf + offset,
-							line + 7,
-							dmode,
-							encoding);
-			if (!memcmp(line, "committer ", 10) &&
-			    (fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
-				offset += add_user_info("Commit", fmt,
-							buf + offset,
-							line + 10,
-							dmode,
-							encoding);
-			continue;
-		}
+	}
 
-		if (!subject)
-			body = 1;
+	/* These formats treat the title line specially. */
+	if (fmt == CMIT_FMT_ONELINE || fmt == CMIT_FMT_EMAIL)
+		pp_title_line(fmt, &msg, sb, subject,
+			      after_subject, encoding, plain_non_ascii);
 
-		if (is_empty_line(line, &linelen)) {
-			if (!seen_title)
-				continue;
-			if (!body)
-				continue;
-			if (subject)
-				continue;
-			if (fmt == CMIT_FMT_SHORT)
-				break;
-		}
+	beginning_of_body = sb->len;
+	if (fmt != CMIT_FMT_ONELINE)
+		pp_remainder(fmt, &msg, sb, indent);
+	strbuf_rtrim(sb);
 
-		seen_title = 1;
-		if (subject) {
-			int slen = strlen(subject);
-			memcpy(buf + offset, subject, slen);
-			offset += slen;
-			offset += add_rfc2047(buf + offset, line, linelen,
-					      encoding);
-		}
-		else {
-			memset(buf + offset, ' ', indent);
-			memcpy(buf + offset + indent, line, linelen);
-			offset += linelen + indent;
-		}
-		buf[offset++] = '\n';
-		if (fmt == CMIT_FMT_ONELINE)
-			break;
-		if (subject && plain_non_ascii) {
-			int sz;
-			char header[512];
-			const char *header_fmt =
-				"MIME-Version: 1.0\n"
-				"Content-Type: text/plain; charset=%s\n"
-				"Content-Transfer-Encoding: 8bit\n";
-			sz = snprintf(header, sizeof(header), header_fmt,
-				      encoding);
-			if (sizeof(header) < sz)
-				die("Encoding name %s too long", encoding);
-			memcpy(buf + offset, header, sz);
-			offset += sz;
-		}
-		if (after_subject) {
-			int slen = strlen(after_subject);
-			if (slen > space - offset - 1)
-				slen = space - offset - 1;
-			memcpy(buf + offset, after_subject, slen);
-			offset += slen;
-			after_subject = NULL;
-		}
-		subject = NULL;
-	}
-	while (offset && isspace(buf[offset-1]))
-		offset--;
 	/* Make sure there is an EOLN for the non-oneline case */
 	if (fmt != CMIT_FMT_ONELINE)
-		buf[offset++] = '\n';
+		strbuf_addch(sb, '\n');
+
 	/*
-	 * make sure there is another EOLN to separate the headers from whatever
-	 * body the caller appends if we haven't already written a body
+	 * The caller may append additional body text in e-mail
+	 * format.  Make sure we did not strip the blank line
+	 * between the header and the body.
 	 */
-	if (fmt == CMIT_FMT_EMAIL && !body)
-		buf[offset++] = '\n';
-	buf[offset] = '\0';
-
+	if (fmt == CMIT_FMT_EMAIL && sb->len <= beginning_of_body)
+		strbuf_addch(sb, '\n');
 	free(reencoded);
-	return offset;
 }
 
 struct commit *pop_commit(struct commit_list **stack)
@@ -1180,12 +1212,12 @@ void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
 		next=next->next;
 	}
 	/*
-         * find the tips
-         *
-         * tips are nodes not reachable from any other node in the list
-         *
-         * the tips serve as a starting set for the work queue.
-         */
+	 * find the tips
+	 *
+	 * tips are nodes not reachable from any other node in the list
+	 *
+	 * the tips serve as a starting set for the work queue.
+	 */
 	next=*list;
 	insert = &work;
 	while (next) {
@@ -1212,9 +1244,9 @@ void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
 			if (pn) {
 				/*
 				 * parents are only enqueued for emission
-                                 * when all their children have been emitted thereby
-                                 * guaranteeing topological order.
-                                 */
+				 * when all their children have been emitted thereby
+				 * guaranteeing topological order.
+				 */
 				pn->indegree--;
 				if (!pn->indegree) {
 					if (!lifo)
@@ -1226,9 +1258,9 @@ void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
 			parents=parents->next;
 		}
 		/*
-                 * work_item is a commit all of whose children
-                 * have already been emitted. we can emit it now.
-                 */
+		 * work_item is a commit all of whose children
+		 * have already been emitted. we can emit it now.
+		 */
 		*pptr = work_node->list_item;
 		pptr = &(*pptr)->next;
 		*pptr = NULL;
@@ -1324,8 +1356,7 @@ static struct commit_list *merge_bases(struct commit *one, struct commit *two)
 }
 
 struct commit_list *get_merge_bases(struct commit *one,
-				    struct commit *two,
-                                    int cleanup)
+					struct commit *two, int cleanup)
 {
 	struct commit_list *list;
 	struct commit **rslt;