chore(3p/git): Unvendor git and track patches instead r/2903

This was vendored a long time ago under the expectation that keeping
it in sync with cgit would be easier this way, but it has proven not
to be a big issue.

On the other hand, a vendored copy of git is an annoying maintenance
burden. It is much easier to rebase the single (dottime) patch that we
have.

This removes the vendored copy of git and instead passes the git
source code to cgit via `pkgs.srcOnly`, which includes the applied
patch so that cgit can continue rendering dottime.

Change-Id: If31f62dea7ce688fd1b9050204e9378019775f2b

3 files changed, 0 insertions, 2559 deletions

diff --git a/third_party/git/t/t4256/1/mailinfo.c b/third_party/git/t/t4256/1/mailinfo.c
deleted file mode 100644
index b395adbdf2a4..000000000000
--- a/third_party/git/t/t4256/1/mailinfo.c
+++ /dev/null
@@ -1,1245 +0,0 @@
-#include "cache.h"
-#include "config.h"
-#include "utf8.h"
-#include "strbuf.h"
-#include "mailinfo.h"
-
-static void cleanup_space(struct strbuf *sb)
-{
-	size_t pos, cnt;
-	for (pos = 0; pos < sb->len; pos++) {
-		if (isspace(sb->buf[pos])) {
-			sb->buf[pos] = ' ';
-			for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
-			strbuf_remove(sb, pos + 1, cnt);
-		}
-	}
-}
-
-static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
-{
-	struct strbuf *src = name;
-	if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
-		strchr(name->buf, '<') || strchr(name->buf, '>'))
-		src = email;
-	else if (name == out)
-		return;
-	strbuf_reset(out);
-	strbuf_addbuf(out, src);
-}
-
-static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
-{
-	/* John Doe <johndoe> */
-
-	char *bra, *ket;
-	/* This is fallback, so do not bother if we already have an
-	 * e-mail address.
-	 */
-	if (mi->email.len)
-		return;
-
-	bra = strchr(line->buf, '<');
-	if (!bra)
-		return;
-	ket = strchr(bra, '>');
-	if (!ket)
-		return;
-
-	strbuf_reset(&mi->email);
-	strbuf_add(&mi->email, bra + 1, ket - bra - 1);
-
-	strbuf_reset(&mi->name);
-	strbuf_add(&mi->name, line->buf, bra - line->buf);
-	strbuf_trim(&mi->name);
-	get_sane_name(&mi->name, &mi->name, &mi->email);
-}
-
-static const char *unquote_comment(struct strbuf *outbuf, const char *in)
-{
-	int c;
-	int take_next_literally = 0;
-
-	strbuf_addch(outbuf, '(');
-
-	while ((c = *in++) != 0) {
-		if (take_next_literally == 1) {
-			take_next_literally = 0;
-		} else {
-			switch (c) {
-			case '\\':
-				take_next_literally = 1;
-				continue;
-			case '(':
-				in = unquote_comment(outbuf, in);
-				continue;
-			case ')':
-				strbuf_addch(outbuf, ')');
-				return in;
-			}
-		}
-
-		strbuf_addch(outbuf, c);
-	}
-
-	return in;
-}
-
-static const char *unquote_quoted_string(struct strbuf *outbuf, const char *in)
-{
-	int c;
-	int take_next_literally = 0;
-
-	while ((c = *in++) != 0) {
-		if (take_next_literally == 1) {
-			take_next_literally = 0;
-		} else {
-			switch (c) {
-			case '\\':
-				take_next_literally = 1;
-				continue;
-			case '"':
-				return in;
-			}
-		}
-
-		strbuf_addch(outbuf, c);
-	}
-
-	return in;
-}
-
-static void unquote_quoted_pair(struct strbuf *line)
-{
-	struct strbuf outbuf;
-	const char *in = line->buf;
-	int c;
-
-	strbuf_init(&outbuf, line->len);
-
-	while ((c = *in++) != 0) {
-		switch (c) {
-		case '"':
-			in = unquote_quoted_string(&outbuf, in);
-			continue;
-		case '(':
-			in = unquote_comment(&outbuf, in);
-			continue;
-		}
-
-		strbuf_addch(&outbuf, c);
-	}
-
-	strbuf_swap(&outbuf, line);
-	strbuf_release(&outbuf);
-
-}
-
-static void handle_from(struct mailinfo *mi, const struct strbuf *from)
-{
-	char *at;
-	size_t el;
-	struct strbuf f;
-
-	strbuf_init(&f, from->len);
-	strbuf_addbuf(&f, from);
-
-	unquote_quoted_pair(&f);
-
-	at = strchr(f.buf, '@');
-	if (!at) {
-		parse_bogus_from(mi, from);
-		goto out;
-	}
-
-	/*
-	 * If we already have one email, don't take any confusing lines
-	 */
-	if (mi->email.len && strchr(at + 1, '@'))
-		goto out;
-
-	/* Pick up the string around '@', possibly delimited with <>
-	 * pair; that is the email part.
-	 */
-	while (at > f.buf) {
-		char c = at[-1];
-		if (isspace(c))
-			break;
-		if (c == '<') {
-			at[-1] = ' ';
-			break;
-		}
-		at--;
-	}
-	el = strcspn(at, " \n\t\r\v\f>");
-	strbuf_reset(&mi->email);
-	strbuf_add(&mi->email, at, el);
-	strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
-
-	/* The remainder is name.  It could be
-	 *
-	 * - "John Doe <john.doe@xz>"			(a), or
-	 * - "john.doe@xz (John Doe)"			(b), or
-	 * - "John (zzz) Doe <john.doe@xz> (Comment)"	(c)
-	 *
-	 * but we have removed the email part, so
-	 *
-	 * - remove extra spaces which could stay after email (case 'c'), and
-	 * - trim from both ends, possibly removing the () pair at the end
-	 *   (cases 'a' and 'b').
-	 */
-	cleanup_space(&f);
-	strbuf_trim(&f);
-	if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
-		strbuf_remove(&f, 0, 1);
-		strbuf_setlen(&f, f.len - 1);
-	}
-
-	get_sane_name(&mi->name, &f, &mi->email);
-out:
-	strbuf_release(&f);
-}
-
-static void handle_header(struct strbuf **out, const struct strbuf *line)
-{
-	if (!*out) {
-		*out = xmalloc(sizeof(struct strbuf));
-		strbuf_init(*out, line->len);
-	} else
-		strbuf_reset(*out);
-
-	strbuf_addbuf(*out, line);
-}
-
-/* NOTE NOTE NOTE.  We do not claim we do full MIME.  We just attempt
- * to have enough heuristics to grok MIME encoded patches often found
- * on our mailing lists.  For example, we do not even treat header lines
- * case insensitively.
- */
-
-static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
-{
-	const char *ends, *ap = strcasestr(line, name);
-	size_t sz;
-
-	strbuf_setlen(attr, 0);
-	if (!ap)
-		return 0;
-	ap += strlen(name);
-	if (*ap == '"') {
-		ap++;
-		ends = "\"";
-	}
-	else
-		ends = "; \t";
-	sz = strcspn(ap, ends);
-	strbuf_add(attr, ap, sz);
-	return 1;
-}
-
-static int has_attr_value(const char *line, const char *name, const char *value)
-{
-	struct strbuf sb = STRBUF_INIT;
-	int rc = slurp_attr(line, name, &sb) && !strcasecmp(sb.buf, value);
-	strbuf_release(&sb);
-	return rc;
-}
-
-static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
-	strbuf_init(boundary, line->len);
-
-	mi->format_flowed = has_attr_value(line->buf, "format=", "flowed");
-	mi->delsp = has_attr_value(line->buf, "delsp=", "yes");
-
-	if (slurp_attr(line->buf, "boundary=", boundary)) {
-		strbuf_insert(boundary, 0, "--", 2);
-		if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
-			error("Too many boundaries to handle");
-			mi->input_error = -1;
-			mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
-			return;
-		}
-		*(mi->content_top) = boundary;
-		boundary = NULL;
-	}
-	slurp_attr(line->buf, "charset=", &mi->charset);
-
-	if (boundary) {
-		strbuf_release(boundary);
-		free(boundary);
-	}
-}
-
-static void handle_content_transfer_encoding(struct mailinfo *mi,
-					     const struct strbuf *line)
-{
-	if (strcasestr(line->buf, "base64"))
-		mi->transfer_encoding = TE_BASE64;
-	else if (strcasestr(line->buf, "quoted-printable"))
-		mi->transfer_encoding = TE_QP;
-	else
-		mi->transfer_encoding = TE_DONTCARE;
-}
-
-static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
-{
-	struct strbuf *content_top = *(mi->content_top);
-
-	return ((content_top->len <= line->len) &&
-		!memcmp(line->buf, content_top->buf, content_top->len));
-}
-
-static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
-{
-	size_t at = 0;
-
-	while (at < subject->len) {
-		char *pos;
-		size_t remove;
-
-		switch (subject->buf[at]) {
-		case 'r': case 'R':
-			if (subject->len <= at + 3)
-				break;
-			if ((subject->buf[at + 1] == 'e' ||
-			     subject->buf[at + 1] == 'E') &&
-			    subject->buf[at + 2] == ':') {
-				strbuf_remove(subject, at, 3);
-				continue;
-			}
-			at++;
-			break;
-		case ' ': case '\t': case ':':
-			strbuf_remove(subject, at, 1);
-			continue;
-		case '[':
-			pos = strchr(subject->buf + at, ']');
-			if (!pos)
-				break;
-			remove = pos - subject->buf + at + 1;
-			if (!mi->keep_non_patch_brackets_in_subject ||
-			    (7 <= remove &&
-			     memmem(subject->buf + at, remove, "PATCH", 5)))
-				strbuf_remove(subject, at, remove);
-			else {
-				at += remove;
-				/*
-				 * If the input had a space after the ], keep
-				 * it.  We don't bother with finding the end of
-				 * the space, since we later normalize it
-				 * anyway.
-				 */
-				if (isspace(subject->buf[at]))
-					at += 1;
-			}
-			continue;
-		}
-		break;
-	}
-	strbuf_trim(subject);
-}
-
-#define MAX_HDR_PARSED 10
-static const char *header[MAX_HDR_PARSED] = {
-	"From","Subject","Date",
-};
-
-static inline int cmp_header(const struct strbuf *line, const char *hdr)
-{
-	int len = strlen(hdr);
-	return !strncasecmp(line->buf, hdr, len) && line->len > len &&
-			line->buf[len] == ':' && isspace(line->buf[len + 1]);
-}
-
-static int is_format_patch_separator(const char *line, int len)
-{
-	static const char SAMPLE[] =
-		"From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
-	const char *cp;
-
-	if (len != strlen(SAMPLE))
-		return 0;
-	if (!skip_prefix(line, "From ", &cp))
-		return 0;
-	if (strspn(cp, "0123456789abcdef") != 40)
-		return 0;
-	cp += 40;
-	return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
-}
-
-static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
-{
-	const char *in = q_seg->buf;
-	int c;
-	struct strbuf *out = xmalloc(sizeof(struct strbuf));
-	strbuf_init(out, q_seg->len);
-
-	while ((c = *in++) != 0) {
-		if (c == '=') {
-			int ch, d = *in;
-			if (d == '\n' || !d)
-				break; /* drop trailing newline */
-			ch = hex2chr(in);
-			if (ch >= 0) {
-				strbuf_addch(out, ch);
-				in += 2;
-				continue;
-			}
-			/* garbage -- fall through */
-		}
-		if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
-			c = 0x20;
-		strbuf_addch(out, c);
-	}
-	return out;
-}
-
-static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
-{
-	/* Decode in..ep, possibly in-place to ot */
-	int c, pos = 0, acc = 0;
-	const char *in = b_seg->buf;
-	struct strbuf *out = xmalloc(sizeof(struct strbuf));
-	strbuf_init(out, b_seg->len);
-
-	while ((c = *in++) != 0) {
-		if (c == '+')
-			c = 62;
-		else if (c == '/')
-			c = 63;
-		else if ('A' <= c && c <= 'Z')
-			c -= 'A';
-		else if ('a' <= c && c <= 'z')
-			c -= 'a' - 26;
-		else if ('0' <= c && c <= '9')
-			c -= '0' - 52;
-		else
-			continue; /* garbage */
-		switch (pos++) {
-		case 0:
-			acc = (c << 2);
-			break;
-		case 1:
-			strbuf_addch(out, (acc | (c >> 4)));
-			acc = (c & 15) << 4;
-			break;
-		case 2:
-			strbuf_addch(out, (acc | (c >> 2)));
-			acc = (c & 3) << 6;
-			break;
-		case 3:
-			strbuf_addch(out, (acc | c));
-			acc = pos = 0;
-			break;
-		}
-	}
-	return out;
-}
-
-static int convert_to_utf8(struct mailinfo *mi,
-			   struct strbuf *line, const char *charset)
-{
-	char *out;
-
-	if (!mi->metainfo_charset || !charset || !*charset)
-		return 0;
-
-	if (same_encoding(mi->metainfo_charset, charset))
-		return 0;
-	out = reencode_string(line->buf, mi->metainfo_charset, charset);
-	if (!out) {
-		mi->input_error = -1;
-		return error("cannot convert from %s to %s",
-			     charset, mi->metainfo_charset);
-	}
-	strbuf_attach(line, out, strlen(out), strlen(out));
-	return 0;
-}
-
-static void decode_header(struct mailinfo *mi, struct strbuf *it)
-{
-	char *in, *ep, *cp;
-	struct strbuf outbuf = STRBUF_INIT, *dec;
-	struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
-	int found_error = 1; /* pessimism */
-
-	in = it->buf;
-	while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
-		int encoding;
-		strbuf_reset(&charset_q);
-		strbuf_reset(&piecebuf);
-
-		if (in != ep) {
-			/*
-			 * We are about to process an encoded-word
-			 * that begins at ep, but there is something
-			 * before the encoded word.
-			 */
-			char *scan;
-			for (scan = in; scan < ep; scan++)
-				if (!isspace(*scan))
-					break;
-
-			if (scan != ep || in == it->buf) {
-				/*
-				 * We should not lose that "something",
-				 * unless we have just processed an
-				 * encoded-word, and there is only LWS
-				 * before the one we are about to process.
-				 */
-				strbuf_add(&outbuf, in, ep - in);
-			}
-		}
-		/* E.g.
-		 * ep : "=?iso-2022-jp?B?GyR...?= foo"
-		 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
-		 */
-		ep += 2;
-
-		if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
-			goto release_return;
-
-		if (cp + 3 - it->buf > it->len)
-			goto release_return;
-		strbuf_add(&charset_q, ep, cp - ep);
-
-		encoding = cp[1];
-		if (!encoding || cp[2] != '?')
-			goto release_return;
-		ep = strstr(cp + 3, "?=");
-		if (!ep)
-			goto release_return;
-		strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
-		switch (tolower(encoding)) {
-		default:
-			goto release_return;
-		case 'b':
-			dec = decode_b_segment(&piecebuf);
-			break;
-		case 'q':
-			dec = decode_q_segment(&piecebuf, 1);
-			break;
-		}
-		if (convert_to_utf8(mi, dec, charset_q.buf))
-			goto release_return;
-
-		strbuf_addbuf(&outbuf, dec);
-		strbuf_release(dec);
-		free(dec);
-		in = ep + 2;
-	}
-	strbuf_addstr(&outbuf, in);
-	strbuf_reset(it);
-	strbuf_addbuf(it, &outbuf);
-	found_error = 0;
-release_return:
-	strbuf_release(&outbuf);
-	strbuf_release(&charset_q);
-	strbuf_release(&piecebuf);
-
-	if (found_error)
-		mi->input_error = -1;
-}
-
-static int check_header(struct mailinfo *mi,
-			const struct strbuf *line,
-			struct strbuf *hdr_data[], int overwrite)
-{
-	int i, ret = 0, len;
-	struct strbuf sb = STRBUF_INIT;
-
-	/* search for the interesting parts */
-	for (i = 0; header[i]; i++) {
-		int len = strlen(header[i]);
-		if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
-			/* Unwrap inline B and Q encoding, and optionally
-			 * normalize the meta information to utf8.
-			 */
-			strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
-			decode_header(mi, &sb);
-			handle_header(&hdr_data[i], &sb);
-			ret = 1;
-			goto check_header_out;
-		}
-	}
-
-	/* Content stuff */
-	if (cmp_header(line, "Content-Type")) {
-		len = strlen("Content-Type: ");
-		strbuf_add(&sb, line->buf + len, line->len - len);
-		decode_header(mi, &sb);
-		strbuf_insert(&sb, 0, "Content-Type: ", len);
-		handle_content_type(mi, &sb);
-		ret = 1;
-		goto check_header_out;
-	}
-	if (cmp_header(line, "Content-Transfer-Encoding")) {
-		len = strlen("Content-Transfer-Encoding: ");
-		strbuf_add(&sb, line->buf + len, line->len - len);
-		decode_header(mi, &sb);
-		handle_content_transfer_encoding(mi, &sb);
-		ret = 1;
-		goto check_header_out;
-	}
-	if (cmp_header(line, "Message-Id")) {
-		len = strlen("Message-Id: ");
-		strbuf_add(&sb, line->buf + len, line->len - len);
-		decode_header(mi, &sb);
-		if (mi->add_message_id)
-			mi->message_id = strbuf_detach(&sb, NULL);
-		ret = 1;
-		goto check_header_out;
-	}
-
-check_header_out:
-	strbuf_release(&sb);
-	return ret;
-}
-
-/*
- * Returns 1 if the given line or any line beginning with the given line is an
- * in-body header (that is, check_header will succeed when passed
- * mi->s_hdr_data).
- */
-static int is_inbody_header(const struct mailinfo *mi,
-			    const struct strbuf *line)
-{
-	int i;
-	for (i = 0; header[i]; i++)
-		if (!mi->s_hdr_data[i] && cmp_header(line, header[i]))
-			return 1;
-	return 0;
-}
-
-static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf *ret;
-
-	switch (mi->transfer_encoding) {
-	case TE_QP:
-		ret = decode_q_segment(line, 0);
-		break;
-	case TE_BASE64:
-		ret = decode_b_segment(line);
-		break;
-	case TE_DONTCARE:
-	default:
-		return;
-	}
-	strbuf_reset(line);
-	strbuf_addbuf(line, ret);
-	strbuf_release(ret);
-	free(ret);
-}
-
-static inline int patchbreak(const struct strbuf *line)
-{
-	size_t i;
-
-	/* Beginning of a "diff -" header? */
-	if (starts_with(line->buf, "diff -"))
-		return 1;
-
-	/* CVS "Index: " line? */
-	if (starts_with(line->buf, "Index: "))
-		return 1;
-
-	/*
-	 * "--- <filename>" starts patches without headers
-	 * "---<sp>*" is a manual separator
-	 */
-	if (line->len < 4)
-		return 0;
-
-	if (starts_with(line->buf, "---")) {
-		/* space followed by a filename? */
-		if (line->buf[3] == ' ' && !isspace(line->buf[4]))
-			return 1;
-		/* Just whitespace? */
-		for (i = 3; i < line->len; i++) {
-			unsigned char c = line->buf[i];
-			if (c == '\n')
-				return 1;
-			if (!isspace(c))
-				break;
-		}
-		return 0;
-	}
-	return 0;
-}
-
-static int is_scissors_line(const char *line)
-{
-	const char *c;
-	int scissors = 0, gap = 0;
-	const char *first_nonblank = NULL, *last_nonblank = NULL;
-	int visible, perforation = 0, in_perforation = 0;
-
-	for (c = line; *c; c++) {
-		if (isspace(*c)) {
-			if (in_perforation) {
-				perforation++;
-				gap++;
-			}
-			continue;
-		}
-		last_nonblank = c;
-		if (first_nonblank == NULL)
-			first_nonblank = c;
-		if (*c == '-') {
-			in_perforation = 1;
-			perforation++;
-			continue;
-		}
-		if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
-		     !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
-			in_perforation = 1;
-			perforation += 2;
-			scissors += 2;
-			c++;
-			continue;
-		}
-		in_perforation = 0;
-	}
-
-	/*
-	 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
-	 * Even though there can be arbitrary cruft on the same line
-	 * (e.g. "cut here"), in order to avoid misidentification, the
-	 * perforation must occupy more than a third of the visible
-	 * width of the line, and dashes and scissors must occupy more
-	 * than half of the perforation.
-	 */
-
-	if (first_nonblank && last_nonblank)
-		visible = last_nonblank - first_nonblank + 1;
-	else
-		visible = 0;
-	return (scissors && 8 <= visible &&
-		visible < perforation * 3 &&
-		gap * 2 < perforation);
-}
-
-static void flush_inbody_header_accum(struct mailinfo *mi)
-{
-	if (!mi->inbody_header_accum.len)
-		return;
-	if (!check_header(mi, &mi->inbody_header_accum, mi->s_hdr_data, 0))
-		BUG("inbody_header_accum, if not empty, must always contain a valid in-body header");
-	strbuf_reset(&mi->inbody_header_accum);
-}
-
-static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
-{
-	if (mi->inbody_header_accum.len &&
-	    (line->buf[0] == ' ' || line->buf[0] == '\t')) {
-		if (mi->use_scissors && is_scissors_line(line->buf)) {
-			/*
-			 * This is a scissors line; do not consider this line
-			 * as a header continuation line.
-			 */
-			flush_inbody_header_accum(mi);
-			return 0;
-		}
-		strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
-		strbuf_addbuf(&mi->inbody_header_accum, line);
-		return 1;
-	}
-
-	flush_inbody_header_accum(mi);
-
-	if (starts_with(line->buf, ">From") && isspace(line->buf[5]))
-		return is_format_patch_separator(line->buf + 1, line->len - 1);
-	if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
-		int i;
-		for (i = 0; header[i]; i++)
-			if (!strcmp("Subject", header[i])) {
-				handle_header(&mi->s_hdr_data[i], line);
-				return 1;
-			}
-		return 0;
-	}
-	if (is_inbody_header(mi, line)) {
-		strbuf_addbuf(&mi->inbody_header_accum, line);
-		return 1;
-	}
-	return 0;
-}
-
-static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
-{
-	assert(!mi->filter_stage);
-
-	if (mi->header_stage) {
-		if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
-			if (mi->inbody_header_accum.len) {
-				flush_inbody_header_accum(mi);
-				mi->header_stage = 0;
-			}
-			return 0;
-		}
-	}
-
-	if (mi->use_inbody_headers && mi->header_stage) {
-		mi->header_stage = check_inbody_header(mi, line);
-		if (mi->header_stage)
-			return 0;
-	} else
-		/* Only trim the first (blank) line of the commit message
-		 * when ignoring in-body headers.
-		 */
-		mi->header_stage = 0;
-
-	/* normalize the log message to UTF-8. */
-	if (convert_to_utf8(mi, line, mi->charset.buf))
-		return 0; /* mi->input_error already set */
-
-	if (mi->use_scissors && is_scissors_line(line->buf)) {
-		int i;
-
-		strbuf_setlen(&mi->log_message, 0);
-		mi->header_stage = 1;
-
-		/*
-		 * We may have already read "secondary headers"; purge
-		 * them to give ourselves a clean restart.
-		 */
-		for (i = 0; header[i]; i++) {
-			if (mi->s_hdr_data[i])
-				strbuf_release(mi->s_hdr_data[i]);
-			mi->s_hdr_data[i] = NULL;
-		}
-		return 0;
-	}
-
-	if (patchbreak(line)) {
-		if (mi->message_id)
-			strbuf_addf(&mi->log_message,
-				    "Message-Id: %s\n", mi->message_id);
-		return 1;
-	}
-
-	strbuf_addbuf(&mi->log_message, line);
-	return 0;
-}
-
-static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
-{
-	fwrite(line->buf, 1, line->len, mi->patchfile);
-	mi->patch_lines++;
-}
-
-static void handle_filter(struct mailinfo *mi, struct strbuf *line)
-{
-	switch (mi->filter_stage) {
-	case 0:
-		if (!handle_commit_msg(mi, line))
-			break;
-		mi->filter_stage++;
-		/* fallthrough */
-	case 1:
-		handle_patch(mi, line);
-		break;
-	}
-}
-
-static int is_rfc2822_header(const struct strbuf *line)
-{
-	/*
-	 * The section that defines the loosest possible
-	 * field name is "3.6.8 Optional fields".
-	 *
-	 * optional-field = field-name ":" unstructured CRLF
-	 * field-name = 1*ftext
-	 * ftext = %d33-57 / %59-126
-	 */
-	int ch;
-	char *cp = line->buf;
-
-	/* Count mbox From headers as headers */
-	if (starts_with(cp, "From ") || starts_with(cp, ">From "))
-		return 1;
-
-	while ((ch = *cp++)) {
-		if (ch == ':')
-			return 1;
-		if ((33 <= ch && ch <= 57) ||
-		    (59 <= ch && ch <= 126))
-			continue;
-		break;
-	}
-	return 0;
-}
-
-static int read_one_header_line(struct strbuf *line, FILE *in)
-{
-	struct strbuf continuation = STRBUF_INIT;
-
-	/* Get the first part of the line. */
-	if (strbuf_getline_lf(line, in))
-		return 0;
-
-	/*
-	 * Is it an empty line or not a valid rfc2822 header?
-	 * If so, stop here, and return false ("not a header")
-	 */
-	strbuf_rtrim(line);
-	if (!line->len || !is_rfc2822_header(line)) {
-		/* Re-add the newline */
-		strbuf_addch(line, '\n');
-		return 0;
-	}
-
-	/*
-	 * Now we need to eat all the continuation lines..
-	 * Yuck, 2822 header "folding"
-	 */
-	for (;;) {
-		int peek;
-
-		peek = fgetc(in);
-		if (peek == EOF)
-			break;
-		ungetc(peek, in);
-		if (peek != ' ' && peek != '\t')
-			break;
-		if (strbuf_getline_lf(&continuation, in))
-			break;
-		continuation.buf[0] = ' ';
-		strbuf_rtrim(&continuation);
-		strbuf_addbuf(line, &continuation);
-	}
-	strbuf_release(&continuation);
-
-	return 1;
-}
-
-static int find_boundary(struct mailinfo *mi, struct strbuf *line)
-{
-	while (!strbuf_getline_lf(line, mi->input)) {
-		if (*(mi->content_top) && is_multipart_boundary(mi, line))
-			return 1;
-	}
-	return 0;
-}
-
-static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf newline = STRBUF_INIT;
-
-	strbuf_addch(&newline, '\n');
-again:
-	if (line->len >= (*(mi->content_top))->len + 2 &&
-	    !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
-		/* we hit an end boundary */
-		/* pop the current boundary off the stack */
-		strbuf_release(*(mi->content_top));
-		FREE_AND_NULL(*(mi->content_top));
-
-		/* technically won't happen as is_multipart_boundary()
-		   will fail first.  But just in case..
-		 */
-		if (--mi->content_top < mi->content) {
-			error("Detected mismatched boundaries, can't recover");
-			mi->input_error = -1;
-			mi->content_top = mi->content;
-			strbuf_release(&newline);
-			return 0;
-		}
-		handle_filter(mi, &newline);
-		strbuf_release(&newline);
-		if (mi->input_error)
-			return 0;
-
-		/* skip to the next boundary */
-		if (!find_boundary(mi, line))
-			return 0;
-		goto again;
-	}
-
-	/* set some defaults */
-	mi->transfer_encoding = TE_DONTCARE;
-	strbuf_reset(&mi->charset);
-
-	/* slurp in this section's info */
-	while (read_one_header_line(line, mi->input))
-		check_header(mi, line, mi->p_hdr_data, 0);
-
-	strbuf_release(&newline);
-	/* replenish line */
-	if (strbuf_getline_lf(line, mi->input))
-		return 0;
-	strbuf_addch(line, '\n');
-	return 1;
-}
-
-static void handle_filter_flowed(struct mailinfo *mi, struct strbuf *line,
-				 struct strbuf *prev)
-{
-	size_t len = line->len;
-	const char *rest;
-
-	if (!mi->format_flowed) {
-		handle_filter(mi, line);
-		return;
-	}
-
-	if (line->buf[len - 1] == '\n') {
-		len--;
-		if (len && line->buf[len - 1] == '\r')
-			len--;
-	}
-
-	/* Keep signature separator as-is. */
-	if (skip_prefix(line->buf, "-- ", &rest) && rest - line->buf == len) {
-		if (prev->len) {
-			handle_filter(mi, prev);
-			strbuf_reset(prev);
-		}
-		handle_filter(mi, line);
-		return;
-	}
-
-	/* Unstuff space-stuffed line. */
-	if (len && line->buf[0] == ' ') {
-		strbuf_remove(line, 0, 1);
-		len--;
-	}
-
-	/* Save flowed line for later, but without the soft line break. */
-	if (len && line->buf[len - 1] == ' ') {
-		strbuf_add(prev, line->buf, len - !!mi->delsp);
-		return;
-	}
-
-	/* Prepend any previous partial lines */
-	strbuf_insert(line, 0, prev->buf, prev->len);
-	strbuf_reset(prev);
-
-	handle_filter(mi, line);
-}
-
-static void handle_body(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf prev = STRBUF_INIT;
-
-	/* Skip up to the first boundary */
-	if (*(mi->content_top)) {
-		if (!find_boundary(mi, line))
-			goto handle_body_out;
-	}
-
-	do {
-		/* process any boundary lines */
-		if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
-			/* flush any leftover */
-			if (prev.len) {
-				handle_filter(mi, &prev);
-				strbuf_reset(&prev);
-			}
-			if (!handle_boundary(mi, line))
-				goto handle_body_out;
-		}
-
-		/* Unwrap transfer encoding */
-		decode_transfer_encoding(mi, line);
-
-		switch (mi->transfer_encoding) {
-		case TE_BASE64:
-		case TE_QP:
-		{
-			struct strbuf **lines, **it, *sb;
-
-			/* Prepend any previous partial lines */
-			strbuf_insert(line, 0, prev.buf, prev.len);
-			strbuf_reset(&prev);
-
-			/*
-			 * This is a decoded line that may contain
-			 * multiple new lines.  Pass only one chunk
-			 * at a time to handle_filter()
-			 */
-			lines = strbuf_split(line, '\n');
-			for (it = lines; (sb = *it); it++) {
-				if (*(it + 1) == NULL) /* The last line */
-					if (sb->buf[sb->len - 1] != '\n') {
-						/* Partial line, save it for later. */
-						strbuf_addbuf(&prev, sb);
-						break;
-					}
-				handle_filter_flowed(mi, sb, &prev);
-			}
-			/*
-			 * The partial chunk is saved in "prev" and will be
-			 * appended by the next iteration of read_line_with_nul().
-			 */
-			strbuf_list_free(lines);
-			break;
-		}
-		default:
-			handle_filter_flowed(mi, line, &prev);
-		}
-
-		if (mi->input_error)
-			break;
-	} while (!strbuf_getwholeline(line, mi->input, '\n'));
-
-	if (prev.len)
-		handle_filter(mi, &prev);
-
-	flush_inbody_header_accum(mi);
-
-handle_body_out:
-	strbuf_release(&prev);
-}
-
-static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
-{
-	const char *sp = data->buf;
-	while (1) {
-		char *ep = strchr(sp, '\n');
-		int len;
-		if (!ep)
-			len = strlen(sp);
-		else
-			len = ep - sp;
-		fprintf(fout, "%s: %.*s\n", hdr, len, sp);
-		if (!ep)
-			break;
-		sp = ep + 1;
-	}
-}
-
-static void handle_info(struct mailinfo *mi)
-{
-	struct strbuf *hdr;
-	int i;
-
-	for (i = 0; header[i]; i++) {
-		/* only print inbody headers if we output a patch file */
-		if (mi->patch_lines && mi->s_hdr_data[i])
-			hdr = mi->s_hdr_data[i];
-		else if (mi->p_hdr_data[i])
-			hdr = mi->p_hdr_data[i];
-		else
-			continue;
-
-		if (!strcmp(header[i], "Subject")) {
-			if (!mi->keep_subject) {
-				cleanup_subject(mi, hdr);
-				cleanup_space(hdr);
-			}
-			output_header_lines(mi->output, "Subject", hdr);
-		} else if (!strcmp(header[i], "From")) {
-			cleanup_space(hdr);
-			handle_from(mi, hdr);
-			fprintf(mi->output, "Author: %s\n", mi->name.buf);
-			fprintf(mi->output, "Email: %s\n", mi->email.buf);
-		} else {
-			cleanup_space(hdr);
-			fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
-		}
-	}
-	fprintf(mi->output, "\n");
-}
-
-int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
-{
-	FILE *cmitmsg;
-	int peek;
-	struct strbuf line = STRBUF_INIT;
-
-	cmitmsg = fopen(msg, "w");
-	if (!cmitmsg) {
-		perror(msg);
-		return -1;
-	}
-	mi->patchfile = fopen(patch, "w");
-	if (!mi->patchfile) {
-		perror(patch);
-		fclose(cmitmsg);
-		return -1;
-	}
-
-	mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
-	mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
-
-	do {
-		peek = fgetc(mi->input);
-		if (peek == EOF) {
-			fclose(cmitmsg);
-			return error("empty patch: '%s'", patch);
-		}
-	} while (isspace(peek));
-	ungetc(peek, mi->input);
-
-	/* process the email header */
-	while (read_one_header_line(&line, mi->input))
-		check_header(mi, &line, mi->p_hdr_data, 1);
-
-	handle_body(mi, &line);
-	fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
-	fclose(cmitmsg);
-	fclose(mi->patchfile);
-
-	handle_info(mi);
-	strbuf_release(&line);
-	return mi->input_error;
-}
-
-static int git_mailinfo_config(const char *var, const char *value, void *mi_)
-{
-	struct mailinfo *mi = mi_;
-
-	if (!starts_with(var, "mailinfo."))
-		return git_default_config(var, value, NULL);
-	if (!strcmp(var, "mailinfo.scissors")) {
-		mi->use_scissors = git_config_bool(var, value);
-		return 0;
-	}
-	/* perhaps others here */
-	return 0;
-}
-
-void setup_mailinfo(struct mailinfo *mi)
-{
-	memset(mi, 0, sizeof(*mi));
-	strbuf_init(&mi->name, 0);
-	strbuf_init(&mi->email, 0);
-	strbuf_init(&mi->charset, 0);
-	strbuf_init(&mi->log_message, 0);
-	strbuf_init(&mi->inbody_header_accum, 0);
-	mi->header_stage = 1;
-	mi->use_inbody_headers = 1;
-	mi->content_top = mi->content;
-	git_config(git_mailinfo_config, mi);
-}
-
-void clear_mailinfo(struct mailinfo *mi)
-{
-	int i;
-
-	strbuf_release(&mi->name);
-	strbuf_release(&mi->email);
-	strbuf_release(&mi->charset);
-	strbuf_release(&mi->inbody_header_accum);
-	free(mi->message_id);
-
-	if (mi->p_hdr_data)
-		for (i = 0; mi->p_hdr_data[i]; i++)
-			strbuf_release(mi->p_hdr_data[i]);
-	free(mi->p_hdr_data);
-	if (mi->s_hdr_data)
-		for (i = 0; mi->s_hdr_data[i]; i++)
-			strbuf_release(mi->s_hdr_data[i]);
-	free(mi->s_hdr_data);
-
-	while (mi->content < mi->content_top) {
-		free(*(mi->content_top));
-		mi->content_top--;
-	}
-
-	strbuf_release(&mi->log_message);
-}
diff --git a/third_party/git/t/t4256/1/mailinfo.c.orig b/third_party/git/t/t4256/1/mailinfo.c.orig
deleted file mode 100644
index 3281a37d5183..000000000000
--- a/third_party/git/t/t4256/1/mailinfo.c.orig
+++ /dev/null
@@ -1,1185 +0,0 @@
-#include "cache.h"
-#include "config.h"
-#include "utf8.h"
-#include "strbuf.h"
-#include "mailinfo.h"
-
-static void cleanup_space(struct strbuf *sb)
-{
-	size_t pos, cnt;
-	for (pos = 0; pos < sb->len; pos++) {
-		if (isspace(sb->buf[pos])) {
-			sb->buf[pos] = ' ';
-			for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);
-			strbuf_remove(sb, pos + 1, cnt);
-		}
-	}
-}
-
-static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)
-{
-	struct strbuf *src = name;
-	if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||
-		strchr(name->buf, '<') || strchr(name->buf, '>'))
-		src = email;
-	else if (name == out)
-		return;
-	strbuf_reset(out);
-	strbuf_addbuf(out, src);
-}
-
-static void parse_bogus_from(struct mailinfo *mi, const struct strbuf *line)
-{
-	/* John Doe <johndoe> */
-
-	char *bra, *ket;
-	/* This is fallback, so do not bother if we already have an
-	 * e-mail address.
-	 */
-	if (mi->email.len)
-		return;
-
-	bra = strchr(line->buf, '<');
-	if (!bra)
-		return;
-	ket = strchr(bra, '>');
-	if (!ket)
-		return;
-
-	strbuf_reset(&mi->email);
-	strbuf_add(&mi->email, bra + 1, ket - bra - 1);
-
-	strbuf_reset(&mi->name);
-	strbuf_add(&mi->name, line->buf, bra - line->buf);
-	strbuf_trim(&mi->name);
-	get_sane_name(&mi->name, &mi->name, &mi->email);
-}
-
-static const char *unquote_comment(struct strbuf *outbuf, const char *in)
-{
-	int c;
-	int take_next_literally = 0;
-
-	strbuf_addch(outbuf, '(');
-
-	while ((c = *in++) != 0) {
-		if (take_next_literally == 1) {
-			take_next_literally = 0;
-		} else {
-			switch (c) {
-			case '\\':
-				take_next_literally = 1;
-				continue;
-			case '(':
-				in = unquote_comment(outbuf, in);
-				continue;
-			case ')':
-				strbuf_addch(outbuf, ')');
-				return in;
-			}
-		}
-
-		strbuf_addch(outbuf, c);
-	}
-
-	return in;
-}
-
-static const char *unquote_quoted_string(struct strbuf *outbuf, const char *in)
-{
-	int c;
-	int take_next_literally = 0;
-
-	while ((c = *in++) != 0) {
-		if (take_next_literally == 1) {
-			take_next_literally = 0;
-		} else {
-			switch (c) {
-			case '\\':
-				take_next_literally = 1;
-				continue;
-			case '"':
-				return in;
-			}
-		}
-
-		strbuf_addch(outbuf, c);
-	}
-
-	return in;
-}
-
-static void unquote_quoted_pair(struct strbuf *line)
-{
-	struct strbuf outbuf;
-	const char *in = line->buf;
-	int c;
-
-	strbuf_init(&outbuf, line->len);
-
-	while ((c = *in++) != 0) {
-		switch (c) {
-		case '"':
-			in = unquote_quoted_string(&outbuf, in);
-			continue;
-		case '(':
-			in = unquote_comment(&outbuf, in);
-			continue;
-		}
-
-		strbuf_addch(&outbuf, c);
-	}
-
-	strbuf_swap(&outbuf, line);
-	strbuf_release(&outbuf);
-
-}
-
-static void handle_from(struct mailinfo *mi, const struct strbuf *from)
-{
-	char *at;
-	size_t el;
-	struct strbuf f;
-
-	strbuf_init(&f, from->len);
-	strbuf_addbuf(&f, from);
-
-	unquote_quoted_pair(&f);
-
-	at = strchr(f.buf, '@');
-	if (!at) {
-		parse_bogus_from(mi, from);
-		goto out;
-	}
-
-	/*
-	 * If we already have one email, don't take any confusing lines
-	 */
-	if (mi->email.len && strchr(at + 1, '@'))
-		goto out;
-
-	/* Pick up the string around '@', possibly delimited with <>
-	 * pair; that is the email part.
-	 */
-	while (at > f.buf) {
-		char c = at[-1];
-		if (isspace(c))
-			break;
-		if (c == '<') {
-			at[-1] = ' ';
-			break;
-		}
-		at--;
-	}
-	el = strcspn(at, " \n\t\r\v\f>");
-	strbuf_reset(&mi->email);
-	strbuf_add(&mi->email, at, el);
-	strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));
-
-	/* The remainder is name.  It could be
-	 *
-	 * - "John Doe <john.doe@xz>"			(a), or
-	 * - "john.doe@xz (John Doe)"			(b), or
-	 * - "John (zzz) Doe <john.doe@xz> (Comment)"	(c)
-	 *
-	 * but we have removed the email part, so
-	 *
-	 * - remove extra spaces which could stay after email (case 'c'), and
-	 * - trim from both ends, possibly removing the () pair at the end
-	 *   (cases 'a' and 'b').
-	 */
-	cleanup_space(&f);
-	strbuf_trim(&f);
-	if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {
-		strbuf_remove(&f, 0, 1);
-		strbuf_setlen(&f, f.len - 1);
-	}
-
-	get_sane_name(&mi->name, &f, &mi->email);
-out:
-	strbuf_release(&f);
-}
-
-static void handle_header(struct strbuf **out, const struct strbuf *line)
-{
-	if (!*out) {
-		*out = xmalloc(sizeof(struct strbuf));
-		strbuf_init(*out, line->len);
-	} else
-		strbuf_reset(*out);
-
-	strbuf_addbuf(*out, line);
-}
-
-/* NOTE NOTE NOTE.  We do not claim we do full MIME.  We just attempt
- * to have enough heuristics to grok MIME encoded patches often found
- * on our mailing lists.  For example, we do not even treat header lines
- * case insensitively.
- */
-
-static int slurp_attr(const char *line, const char *name, struct strbuf *attr)
-{
-	const char *ends, *ap = strcasestr(line, name);
-	size_t sz;
-
-	strbuf_setlen(attr, 0);
-	if (!ap)
-		return 0;
-	ap += strlen(name);
-	if (*ap == '"') {
-		ap++;
-		ends = "\"";
-	}
-	else
-		ends = "; \t";
-	sz = strcspn(ap, ends);
-	strbuf_add(attr, ap, sz);
-	return 1;
-}
-
-static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
-	strbuf_init(boundary, line->len);
-
-	if (slurp_attr(line->buf, "boundary=", boundary)) {
-		strbuf_insert(boundary, 0, "--", 2);
-		if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
-			error("Too many boundaries to handle");
-			mi->input_error = -1;
-			mi->content_top = &mi->content[MAX_BOUNDARIES] - 1;
-			return;
-		}
-		*(mi->content_top) = boundary;
-		boundary = NULL;
-	}
-	slurp_attr(line->buf, "charset=", &mi->charset);
-
-	if (boundary) {
-		strbuf_release(boundary);
-		free(boundary);
-	}
-}
-
-static void handle_content_transfer_encoding(struct mailinfo *mi,
-					     const struct strbuf *line)
-{
-	if (strcasestr(line->buf, "base64"))
-		mi->transfer_encoding = TE_BASE64;
-	else if (strcasestr(line->buf, "quoted-printable"))
-		mi->transfer_encoding = TE_QP;
-	else
-		mi->transfer_encoding = TE_DONTCARE;
-}
-
-static int is_multipart_boundary(struct mailinfo *mi, const struct strbuf *line)
-{
-	struct strbuf *content_top = *(mi->content_top);
-
-	return ((content_top->len <= line->len) &&
-		!memcmp(line->buf, content_top->buf, content_top->len));
-}
-
-static void cleanup_subject(struct mailinfo *mi, struct strbuf *subject)
-{
-	size_t at = 0;
-
-	while (at < subject->len) {
-		char *pos;
-		size_t remove;
-
-		switch (subject->buf[at]) {
-		case 'r': case 'R':
-			if (subject->len <= at + 3)
-				break;
-			if ((subject->buf[at + 1] == 'e' ||
-			     subject->buf[at + 1] == 'E') &&
-			    subject->buf[at + 2] == ':') {
-				strbuf_remove(subject, at, 3);
-				continue;
-			}
-			at++;
-			break;
-		case ' ': case '\t': case ':':
-			strbuf_remove(subject, at, 1);
-			continue;
-		case '[':
-			pos = strchr(subject->buf + at, ']');
-			if (!pos)
-				break;
-			remove = pos - subject->buf + at + 1;
-			if (!mi->keep_non_patch_brackets_in_subject ||
-			    (7 <= remove &&
-			     memmem(subject->buf + at, remove, "PATCH", 5)))
-				strbuf_remove(subject, at, remove);
-			else {
-				at += remove;
-				/*
-				 * If the input had a space after the ], keep
-				 * it.  We don't bother with finding the end of
-				 * the space, since we later normalize it
-				 * anyway.
-				 */
-				if (isspace(subject->buf[at]))
-					at += 1;
-			}
-			continue;
-		}
-		break;
-	}
-	strbuf_trim(subject);
-}
-
-#define MAX_HDR_PARSED 10
-static const char *header[MAX_HDR_PARSED] = {
-	"From","Subject","Date",
-};
-
-static inline int cmp_header(const struct strbuf *line, const char *hdr)
-{
-	int len = strlen(hdr);
-	return !strncasecmp(line->buf, hdr, len) && line->len > len &&
-			line->buf[len] == ':' && isspace(line->buf[len + 1]);
-}
-
-static int is_format_patch_separator(const char *line, int len)
-{
-	static const char SAMPLE[] =
-		"From e6807f3efca28b30decfecb1732a56c7db1137ee Mon Sep 17 00:00:00 2001\n";
-	const char *cp;
-
-	if (len != strlen(SAMPLE))
-		return 0;
-	if (!skip_prefix(line, "From ", &cp))
-		return 0;
-	if (strspn(cp, "0123456789abcdef") != 40)
-		return 0;
-	cp += 40;
-	return !memcmp(SAMPLE + (cp - line), cp, strlen(SAMPLE) - (cp - line));
-}
-
-static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)
-{
-	const char *in = q_seg->buf;
-	int c;
-	struct strbuf *out = xmalloc(sizeof(struct strbuf));
-	strbuf_init(out, q_seg->len);
-
-	while ((c = *in++) != 0) {
-		if (c == '=') {
-			int ch, d = *in;
-			if (d == '\n' || !d)
-				break; /* drop trailing newline */
-			ch = hex2chr(in);
-			if (ch >= 0) {
-				strbuf_addch(out, ch);
-				in += 2;
-				continue;
-			}
-			/* garbage -- fall through */
-		}
-		if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
-			c = 0x20;
-		strbuf_addch(out, c);
-	}
-	return out;
-}
-
-static struct strbuf *decode_b_segment(const struct strbuf *b_seg)
-{
-	/* Decode in..ep, possibly in-place to ot */
-	int c, pos = 0, acc = 0;
-	const char *in = b_seg->buf;
-	struct strbuf *out = xmalloc(sizeof(struct strbuf));
-	strbuf_init(out, b_seg->len);
-
-	while ((c = *in++) != 0) {
-		if (c == '+')
-			c = 62;
-		else if (c == '/')
-			c = 63;
-		else if ('A' <= c && c <= 'Z')
-			c -= 'A';
-		else if ('a' <= c && c <= 'z')
-			c -= 'a' - 26;
-		else if ('0' <= c && c <= '9')
-			c -= '0' - 52;
-		else
-			continue; /* garbage */
-		switch (pos++) {
-		case 0:
-			acc = (c << 2);
-			break;
-		case 1:
-			strbuf_addch(out, (acc | (c >> 4)));
-			acc = (c & 15) << 4;
-			break;
-		case 2:
-			strbuf_addch(out, (acc | (c >> 2)));
-			acc = (c & 3) << 6;
-			break;
-		case 3:
-			strbuf_addch(out, (acc | c));
-			acc = pos = 0;
-			break;
-		}
-	}
-	return out;
-}
-
-static int convert_to_utf8(struct mailinfo *mi,
-			   struct strbuf *line, const char *charset)
-{
-	char *out;
-
-	if (!mi->metainfo_charset || !charset || !*charset)
-		return 0;
-
-	if (same_encoding(mi->metainfo_charset, charset))
-		return 0;
-	out = reencode_string(line->buf, mi->metainfo_charset, charset);
-	if (!out) {
-		mi->input_error = -1;
-		return error("cannot convert from %s to %s",
-			     charset, mi->metainfo_charset);
-	}
-	strbuf_attach(line, out, strlen(out), strlen(out));
-	return 0;
-}
-
-static void decode_header(struct mailinfo *mi, struct strbuf *it)
-{
-	char *in, *ep, *cp;
-	struct strbuf outbuf = STRBUF_INIT, *dec;
-	struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;
-	int found_error = 1; /* pessimism */
-
-	in = it->buf;
-	while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {
-		int encoding;
-		strbuf_reset(&charset_q);
-		strbuf_reset(&piecebuf);
-
-		if (in != ep) {
-			/*
-			 * We are about to process an encoded-word
-			 * that begins at ep, but there is something
-			 * before the encoded word.
-			 */
-			char *scan;
-			for (scan = in; scan < ep; scan++)
-				if (!isspace(*scan))
-					break;
-
-			if (scan != ep || in == it->buf) {
-				/*
-				 * We should not lose that "something",
-				 * unless we have just processed an
-				 * encoded-word, and there is only LWS
-				 * before the one we are about to process.
-				 */
-				strbuf_add(&outbuf, in, ep - in);
-			}
-		}
-		/* E.g.
-		 * ep : "=?iso-2022-jp?B?GyR...?= foo"
-		 * ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
-		 */
-		ep += 2;
-
-		if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))
-			goto release_return;
-
-		if (cp + 3 - it->buf > it->len)
-			goto release_return;
-		strbuf_add(&charset_q, ep, cp - ep);
-
-		encoding = cp[1];
-		if (!encoding || cp[2] != '?')
-			goto release_return;
-		ep = strstr(cp + 3, "?=");
-		if (!ep)
-			goto release_return;
-		strbuf_add(&piecebuf, cp + 3, ep - cp - 3);
-		switch (tolower(encoding)) {
-		default:
-			goto release_return;
-		case 'b':
-			dec = decode_b_segment(&piecebuf);
-			break;
-		case 'q':
-			dec = decode_q_segment(&piecebuf, 1);
-			break;
-		}
-		if (convert_to_utf8(mi, dec, charset_q.buf))
-			goto release_return;
-
-		strbuf_addbuf(&outbuf, dec);
-		strbuf_release(dec);
-		free(dec);
-		in = ep + 2;
-	}
-	strbuf_addstr(&outbuf, in);
-	strbuf_reset(it);
-	strbuf_addbuf(it, &outbuf);
-	found_error = 0;
-release_return:
-	strbuf_release(&outbuf);
-	strbuf_release(&charset_q);
-	strbuf_release(&piecebuf);
-
-	if (found_error)
-		mi->input_error = -1;
-}
-
-static int check_header(struct mailinfo *mi,
-			const struct strbuf *line,
-			struct strbuf *hdr_data[], int overwrite)
-{
-	int i, ret = 0, len;
-	struct strbuf sb = STRBUF_INIT;
-
-	/* search for the interesting parts */
-	for (i = 0; header[i]; i++) {
-		int len = strlen(header[i]);
-		if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {
-			/* Unwrap inline B and Q encoding, and optionally
-			 * normalize the meta information to utf8.
-			 */
-			strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);
-			decode_header(mi, &sb);
-			handle_header(&hdr_data[i], &sb);
-			ret = 1;
-			goto check_header_out;
-		}
-	}
-
-	/* Content stuff */
-	if (cmp_header(line, "Content-Type")) {
-		len = strlen("Content-Type: ");
-		strbuf_add(&sb, line->buf + len, line->len - len);
-		decode_header(mi, &sb);
-		strbuf_insert(&sb, 0, "Content-Type: ", len);
-		handle_content_type(mi, &sb);
-		ret = 1;
-		goto check_header_out;
-	}
-	if (cmp_header(line, "Content-Transfer-Encoding")) {
-		len = strlen("Content-Transfer-Encoding: ");
-		strbuf_add(&sb, line->buf + len, line->len - len);
-		decode_header(mi, &sb);
-		handle_content_transfer_encoding(mi, &sb);
-		ret = 1;
-		goto check_header_out;
-	}
-	if (cmp_header(line, "Message-Id")) {
-		len = strlen("Message-Id: ");
-		strbuf_add(&sb, line->buf + len, line->len - len);
-		decode_header(mi, &sb);
-		if (mi->add_message_id)
-			mi->message_id = strbuf_detach(&sb, NULL);
-		ret = 1;
-		goto check_header_out;
-	}
-
-check_header_out:
-	strbuf_release(&sb);
-	return ret;
-}
-
-/*
- * Returns 1 if the given line or any line beginning with the given line is an
- * in-body header (that is, check_header will succeed when passed
- * mi->s_hdr_data).
- */
-static int is_inbody_header(const struct mailinfo *mi,
-			    const struct strbuf *line)
-{
-	int i;
-	for (i = 0; header[i]; i++)
-		if (!mi->s_hdr_data[i] && cmp_header(line, header[i]))
-			return 1;
-	return 0;
-}
-
-static void decode_transfer_encoding(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf *ret;
-
-	switch (mi->transfer_encoding) {
-	case TE_QP:
-		ret = decode_q_segment(line, 0);
-		break;
-	case TE_BASE64:
-		ret = decode_b_segment(line);
-		break;
-	case TE_DONTCARE:
-	default:
-		return;
-	}
-	strbuf_reset(line);
-	strbuf_addbuf(line, ret);
-	strbuf_release(ret);
-	free(ret);
-}
-
-static inline int patchbreak(const struct strbuf *line)
-{
-	size_t i;
-
-	/* Beginning of a "diff -" header? */
-	if (starts_with(line->buf, "diff -"))
-		return 1;
-
-	/* CVS "Index: " line? */
-	if (starts_with(line->buf, "Index: "))
-		return 1;
-
-	/*
-	 * "--- <filename>" starts patches without headers
-	 * "---<sp>*" is a manual separator
-	 */
-	if (line->len < 4)
-		return 0;
-
-	if (starts_with(line->buf, "---")) {
-		/* space followed by a filename? */
-		if (line->buf[3] == ' ' && !isspace(line->buf[4]))
-			return 1;
-		/* Just whitespace? */
-		for (i = 3; i < line->len; i++) {
-			unsigned char c = line->buf[i];
-			if (c == '\n')
-				return 1;
-			if (!isspace(c))
-				break;
-		}
-		return 0;
-	}
-	return 0;
-}
-
-static int is_scissors_line(const char *line)
-{
-	const char *c;
-	int scissors = 0, gap = 0;
-	const char *first_nonblank = NULL, *last_nonblank = NULL;
-	int visible, perforation = 0, in_perforation = 0;
-
-	for (c = line; *c; c++) {
-		if (isspace(*c)) {
-			if (in_perforation) {
-				perforation++;
-				gap++;
-			}
-			continue;
-		}
-		last_nonblank = c;
-		if (first_nonblank == NULL)
-			first_nonblank = c;
-		if (*c == '-') {
-			in_perforation = 1;
-			perforation++;
-			continue;
-		}
-		if ((!memcmp(c, ">8", 2) || !memcmp(c, "8<", 2) ||
-		     !memcmp(c, ">%", 2) || !memcmp(c, "%<", 2))) {
-			in_perforation = 1;
-			perforation += 2;
-			scissors += 2;
-			c++;
-			continue;
-		}
-		in_perforation = 0;
-	}
-
-	/*
-	 * The mark must be at least 8 bytes long (e.g. "-- >8 --").
-	 * Even though there can be arbitrary cruft on the same line
-	 * (e.g. "cut here"), in order to avoid misidentification, the
-	 * perforation must occupy more than a third of the visible
-	 * width of the line, and dashes and scissors must occupy more
-	 * than half of the perforation.
-	 */
-
-	if (first_nonblank && last_nonblank)
-		visible = last_nonblank - first_nonblank + 1;
-	else
-		visible = 0;
-	return (scissors && 8 <= visible &&
-		visible < perforation * 3 &&
-		gap * 2 < perforation);
-}
-
-static void flush_inbody_header_accum(struct mailinfo *mi)
-{
-	if (!mi->inbody_header_accum.len)
-		return;
-	if (!check_header(mi, &mi->inbody_header_accum, mi->s_hdr_data, 0))
-		BUG("inbody_header_accum, if not empty, must always contain a valid in-body header");
-	strbuf_reset(&mi->inbody_header_accum);
-}
-
-static int check_inbody_header(struct mailinfo *mi, const struct strbuf *line)
-{
-	if (mi->inbody_header_accum.len &&
-	    (line->buf[0] == ' ' || line->buf[0] == '\t')) {
-		if (mi->use_scissors && is_scissors_line(line->buf)) {
-			/*
-			 * This is a scissors line; do not consider this line
-			 * as a header continuation line.
-			 */
-			flush_inbody_header_accum(mi);
-			return 0;
-		}
-		strbuf_strip_suffix(&mi->inbody_header_accum, "\n");
-		strbuf_addbuf(&mi->inbody_header_accum, line);
-		return 1;
-	}
-
-	flush_inbody_header_accum(mi);
-
-	if (starts_with(line->buf, ">From") && isspace(line->buf[5]))
-		return is_format_patch_separator(line->buf + 1, line->len - 1);
-	if (starts_with(line->buf, "[PATCH]") && isspace(line->buf[7])) {
-		int i;
-		for (i = 0; header[i]; i++)
-			if (!strcmp("Subject", header[i])) {
-				handle_header(&mi->s_hdr_data[i], line);
-				return 1;
-			}
-		return 0;
-	}
-	if (is_inbody_header(mi, line)) {
-		strbuf_addbuf(&mi->inbody_header_accum, line);
-		return 1;
-	}
-	return 0;
-}
-
-static int handle_commit_msg(struct mailinfo *mi, struct strbuf *line)
-{
-	assert(!mi->filter_stage);
-
-	if (mi->header_stage) {
-		if (!line->len || (line->len == 1 && line->buf[0] == '\n')) {
-			if (mi->inbody_header_accum.len) {
-				flush_inbody_header_accum(mi);
-				mi->header_stage = 0;
-			}
-			return 0;
-		}
-	}
-
-	if (mi->use_inbody_headers && mi->header_stage) {
-		mi->header_stage = check_inbody_header(mi, line);
-		if (mi->header_stage)
-			return 0;
-	} else
-		/* Only trim the first (blank) line of the commit message
-		 * when ignoring in-body headers.
-		 */
-		mi->header_stage = 0;
-
-	/* normalize the log message to UTF-8. */
-	if (convert_to_utf8(mi, line, mi->charset.buf))
-		return 0; /* mi->input_error already set */
-
-	if (mi->use_scissors && is_scissors_line(line->buf)) {
-		int i;
-
-		strbuf_setlen(&mi->log_message, 0);
-		mi->header_stage = 1;
-
-		/*
-		 * We may have already read "secondary headers"; purge
-		 * them to give ourselves a clean restart.
-		 */
-		for (i = 0; header[i]; i++) {
-			if (mi->s_hdr_data[i])
-				strbuf_release(mi->s_hdr_data[i]);
-			mi->s_hdr_data[i] = NULL;
-		}
-		return 0;
-	}
-
-	if (patchbreak(line)) {
-		if (mi->message_id)
-			strbuf_addf(&mi->log_message,
-				    "Message-Id: %s\n", mi->message_id);
-		return 1;
-	}
-
-	strbuf_addbuf(&mi->log_message, line);
-	return 0;
-}
-
-static void handle_patch(struct mailinfo *mi, const struct strbuf *line)
-{
-	fwrite(line->buf, 1, line->len, mi->patchfile);
-	mi->patch_lines++;
-}
-
-static void handle_filter(struct mailinfo *mi, struct strbuf *line)
-{
-	switch (mi->filter_stage) {
-	case 0:
-		if (!handle_commit_msg(mi, line))
-			break;
-		mi->filter_stage++;
-		/* fallthrough */
-	case 1:
-		handle_patch(mi, line);
-		break;
-	}
-}
-
-static int is_rfc2822_header(const struct strbuf *line)
-{
-	/*
-	 * The section that defines the loosest possible
-	 * field name is "3.6.8 Optional fields".
-	 *
-	 * optional-field = field-name ":" unstructured CRLF
-	 * field-name = 1*ftext
-	 * ftext = %d33-57 / %59-126
-	 */
-	int ch;
-	char *cp = line->buf;
-
-	/* Count mbox From headers as headers */
-	if (starts_with(cp, "From ") || starts_with(cp, ">From "))
-		return 1;
-
-	while ((ch = *cp++)) {
-		if (ch == ':')
-			return 1;
-		if ((33 <= ch && ch <= 57) ||
-		    (59 <= ch && ch <= 126))
-			continue;
-		break;
-	}
-	return 0;
-}
-
-static int read_one_header_line(struct strbuf *line, FILE *in)
-{
-	struct strbuf continuation = STRBUF_INIT;
-
-	/* Get the first part of the line. */
-	if (strbuf_getline_lf(line, in))
-		return 0;
-
-	/*
-	 * Is it an empty line or not a valid rfc2822 header?
-	 * If so, stop here, and return false ("not a header")
-	 */
-	strbuf_rtrim(line);
-	if (!line->len || !is_rfc2822_header(line)) {
-		/* Re-add the newline */
-		strbuf_addch(line, '\n');
-		return 0;
-	}
-
-	/*
-	 * Now we need to eat all the continuation lines..
-	 * Yuck, 2822 header "folding"
-	 */
-	for (;;) {
-		int peek;
-
-		peek = fgetc(in);
-		if (peek == EOF)
-			break;
-		ungetc(peek, in);
-		if (peek != ' ' && peek != '\t')
-			break;
-		if (strbuf_getline_lf(&continuation, in))
-			break;
-		continuation.buf[0] = ' ';
-		strbuf_rtrim(&continuation);
-		strbuf_addbuf(line, &continuation);
-	}
-	strbuf_release(&continuation);
-
-	return 1;
-}
-
-static int find_boundary(struct mailinfo *mi, struct strbuf *line)
-{
-	while (!strbuf_getline_lf(line, mi->input)) {
-		if (*(mi->content_top) && is_multipart_boundary(mi, line))
-			return 1;
-	}
-	return 0;
-}
-
-static int handle_boundary(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf newline = STRBUF_INIT;
-
-	strbuf_addch(&newline, '\n');
-again:
-	if (line->len >= (*(mi->content_top))->len + 2 &&
-	    !memcmp(line->buf + (*(mi->content_top))->len, "--", 2)) {
-		/* we hit an end boundary */
-		/* pop the current boundary off the stack */
-		strbuf_release(*(mi->content_top));
-		FREE_AND_NULL(*(mi->content_top));
-
-		/* technically won't happen as is_multipart_boundary()
-		   will fail first.  But just in case..
-		 */
-		if (--mi->content_top < mi->content) {
-			error("Detected mismatched boundaries, can't recover");
-			mi->input_error = -1;
-			mi->content_top = mi->content;
-			strbuf_release(&newline);
-			return 0;
-		}
-		handle_filter(mi, &newline);
-		strbuf_release(&newline);
-		if (mi->input_error)
-			return 0;
-
-		/* skip to the next boundary */
-		if (!find_boundary(mi, line))
-			return 0;
-		goto again;
-	}
-
-	/* set some defaults */
-	mi->transfer_encoding = TE_DONTCARE;
-	strbuf_reset(&mi->charset);
-
-	/* slurp in this section's info */
-	while (read_one_header_line(line, mi->input))
-		check_header(mi, line, mi->p_hdr_data, 0);
-
-	strbuf_release(&newline);
-	/* replenish line */
-	if (strbuf_getline_lf(line, mi->input))
-		return 0;
-	strbuf_addch(line, '\n');
-	return 1;
-}
-
-static void handle_body(struct mailinfo *mi, struct strbuf *line)
-{
-	struct strbuf prev = STRBUF_INIT;
-
-	/* Skip up to the first boundary */
-	if (*(mi->content_top)) {
-		if (!find_boundary(mi, line))
-			goto handle_body_out;
-	}
-
-	do {
-		/* process any boundary lines */
-		if (*(mi->content_top) && is_multipart_boundary(mi, line)) {
-			/* flush any leftover */
-			if (prev.len) {
-				handle_filter(mi, &prev);
-				strbuf_reset(&prev);
-			}
-			if (!handle_boundary(mi, line))
-				goto handle_body_out;
-		}
-
-		/* Unwrap transfer encoding */
-		decode_transfer_encoding(mi, line);
-
-		switch (mi->transfer_encoding) {
-		case TE_BASE64:
-		case TE_QP:
-		{
-			struct strbuf **lines, **it, *sb;
-
-			/* Prepend any previous partial lines */
-			strbuf_insert(line, 0, prev.buf, prev.len);
-			strbuf_reset(&prev);
-
-			/*
-			 * This is a decoded line that may contain
-			 * multiple new lines.  Pass only one chunk
-			 * at a time to handle_filter()
-			 */
-			lines = strbuf_split(line, '\n');
-			for (it = lines; (sb = *it); it++) {
-				if (*(it + 1) == NULL) /* The last line */
-					if (sb->buf[sb->len - 1] != '\n') {
-						/* Partial line, save it for later. */
-						strbuf_addbuf(&prev, sb);
-						break;
-					}
-				handle_filter(mi, sb);
-			}
-			/*
-			 * The partial chunk is saved in "prev" and will be
-			 * appended by the next iteration of read_line_with_nul().
-			 */
-			strbuf_list_free(lines);
-			break;
-		}
-		default:
-			handle_filter(mi, line);
-		}
-
-		if (mi->input_error)
-			break;
-	} while (!strbuf_getwholeline(line, mi->input, '\n'));
-
-	flush_inbody_header_accum(mi);
-
-handle_body_out:
-	strbuf_release(&prev);
-}
-
-static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)
-{
-	const char *sp = data->buf;
-	while (1) {
-		char *ep = strchr(sp, '\n');
-		int len;
-		if (!ep)
-			len = strlen(sp);
-		else
-			len = ep - sp;
-		fprintf(fout, "%s: %.*s\n", hdr, len, sp);
-		if (!ep)
-			break;
-		sp = ep + 1;
-	}
-}
-
-static void handle_info(struct mailinfo *mi)
-{
-	struct strbuf *hdr;
-	int i;
-
-	for (i = 0; header[i]; i++) {
-		/* only print inbody headers if we output a patch file */
-		if (mi->patch_lines && mi->s_hdr_data[i])
-			hdr = mi->s_hdr_data[i];
-		else if (mi->p_hdr_data[i])
-			hdr = mi->p_hdr_data[i];
-		else
-			continue;
-
-		if (!strcmp(header[i], "Subject")) {
-			if (!mi->keep_subject) {
-				cleanup_subject(mi, hdr);
-				cleanup_space(hdr);
-			}
-			output_header_lines(mi->output, "Subject", hdr);
-		} else if (!strcmp(header[i], "From")) {
-			cleanup_space(hdr);
-			handle_from(mi, hdr);
-			fprintf(mi->output, "Author: %s\n", mi->name.buf);
-			fprintf(mi->output, "Email: %s\n", mi->email.buf);
-		} else {
-			cleanup_space(hdr);
-			fprintf(mi->output, "%s: %s\n", header[i], hdr->buf);
-		}
-	}
-	fprintf(mi->output, "\n");
-}
-
-int mailinfo(struct mailinfo *mi, const char *msg, const char *patch)
-{
-	FILE *cmitmsg;
-	int peek;
-	struct strbuf line = STRBUF_INIT;
-
-	cmitmsg = fopen(msg, "w");
-	if (!cmitmsg) {
-		perror(msg);
-		return -1;
-	}
-	mi->patchfile = fopen(patch, "w");
-	if (!mi->patchfile) {
-		perror(patch);
-		fclose(cmitmsg);
-		return -1;
-	}
-
-	mi->p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->p_hdr_data)));
-	mi->s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*(mi->s_hdr_data)));
-
-	do {
-		peek = fgetc(mi->input);
-		if (peek == EOF) {
-			fclose(cmitmsg);
-			return error("empty patch: '%s'", patch);
-		}
-	} while (isspace(peek));
-	ungetc(peek, mi->input);
-
-	/* process the email header */
-	while (read_one_header_line(&line, mi->input))
-		check_header(mi, &line, mi->p_hdr_data, 1);
-
-	handle_body(mi, &line);
-	fwrite(mi->log_message.buf, 1, mi->log_message.len, cmitmsg);
-	fclose(cmitmsg);
-	fclose(mi->patchfile);
-
-	handle_info(mi);
-	strbuf_release(&line);
-	return mi->input_error;
-}
-
-static int git_mailinfo_config(const char *var, const char *value, void *mi_)
-{
-	struct mailinfo *mi = mi_;
-
-	if (!starts_with(var, "mailinfo."))
-		return git_default_config(var, value, NULL);
-	if (!strcmp(var, "mailinfo.scissors")) {
-		mi->use_scissors = git_config_bool(var, value);
-		return 0;
-	}
-	/* perhaps others here */
-	return 0;
-}
-
-void setup_mailinfo(struct mailinfo *mi)
-{
-	memset(mi, 0, sizeof(*mi));
-	strbuf_init(&mi->name, 0);
-	strbuf_init(&mi->email, 0);
-	strbuf_init(&mi->charset, 0);
-	strbuf_init(&mi->log_message, 0);
-	strbuf_init(&mi->inbody_header_accum, 0);
-	mi->header_stage = 1;
-	mi->use_inbody_headers = 1;
-	mi->content_top = mi->content;
-	git_config(git_mailinfo_config, mi);
-}
-
-void clear_mailinfo(struct mailinfo *mi)
-{
-	int i;
-
-	strbuf_release(&mi->name);
-	strbuf_release(&mi->email);
-	strbuf_release(&mi->charset);
-	strbuf_release(&mi->inbody_header_accum);
-	free(mi->message_id);
-
-	if (mi->p_hdr_data)
-		for (i = 0; mi->p_hdr_data[i]; i++)
-			strbuf_release(mi->p_hdr_data[i]);
-	free(mi->p_hdr_data);
-	if (mi->s_hdr_data)
-		for (i = 0; mi->s_hdr_data[i]; i++)
-			strbuf_release(mi->s_hdr_data[i]);
-	free(mi->s_hdr_data);
-
-	while (mi->content < mi->content_top) {
-		free(*(mi->content_top));
-		mi->content_top--;
-	}
-
-	strbuf_release(&mi->log_message);
-}
diff --git a/third_party/git/t/t4256/1/patch b/third_party/git/t/t4256/1/patch
deleted file mode 100644
index bd0d8b025145..000000000000
--- a/third_party/git/t/t4256/1/patch
+++ /dev/null
@@ -1,129 +0,0 @@
-From: A <author@example.com>
-Subject: [PATCH] mailinfo: support format=flowed
-Message-ID: <aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa@example.com>
-Date: Sat, 25 Aug 2018 22:04:50 +0200
-User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
- Thunderbird/60.0
-MIME-Version: 1.0
-Content-Type: text/plain; charset=utf-8; format=flowed
-Content-Language: en-US
-Content-Transfer-Encoding: 7bit
-
----
-  mailinfo.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
-  1 file changed, 62 insertions(+), 2 deletions(-)
-
-diff --git a/mailinfo.c b/mailinfo.c
-index 3281a37d51..b395adbdf2 100644
---- a/mailinfo.c
-+++ b/mailinfo.c
-@@ -237,11 +237,22 @@ static int slurp_attr(const char *line, const char 
-*name, struct strbuf *attr)
-  	return 1;
-  }
-
-+static int has_attr_value(const char *line, const char *name, const 
-char *value)
-+{
-+	struct strbuf sb = STRBUF_INIT;
-+	int rc = slurp_attr(line, name, &sb) && !strcasecmp(sb.buf, value);
-+	strbuf_release(&sb);
-+	return rc;
-+}
-+
-  static void handle_content_type(struct mailinfo *mi, struct strbuf *line)
-  {
-  	struct strbuf *boundary = xmalloc(sizeof(struct strbuf));
-  	strbuf_init(boundary, line->len);
-
-+	mi->format_flowed = has_attr_value(line->buf, "format=", "flowed");
-+	mi->delsp = has_attr_value(line->buf, "delsp=", "yes");
-+
-  	if (slurp_attr(line->buf, "boundary=", boundary)) {
-  		strbuf_insert(boundary, 0, "--", 2);
-  		if (++mi->content_top >= &mi->content[MAX_BOUNDARIES]) {
-@@ -964,6 +975,52 @@ static int handle_boundary(struct mailinfo *mi, 
-struct strbuf *line)
-  	return 1;
-  }
-
-+static void handle_filter_flowed(struct mailinfo *mi, struct strbuf *line,
-+				 struct strbuf *prev)
-+{
-+	size_t len = line->len;
-+	const char *rest;
-+
-+	if (!mi->format_flowed) {
-+		handle_filter(mi, line);
-+		return;
-+	}
-+
-+	if (line->buf[len - 1] == '\n') {
-+		len--;
-+		if (len && line->buf[len - 1] == '\r')
-+			len--;
-+	}
-+
-+	/* Keep signature separator as-is. */
-+	if (skip_prefix(line->buf, "-- ", &rest) && rest - line->buf == len) {
-+		if (prev->len) {
-+			handle_filter(mi, prev);
-+			strbuf_reset(prev);
-+		}
-+		handle_filter(mi, line);
-+		return;
-+	}
-+
-+	/* Unstuff space-stuffed line. */
-+	if (len && line->buf[0] == ' ') {
-+		strbuf_remove(line, 0, 1);
-+		len--;
-+	}
-+
-+	/* Save flowed line for later, but without the soft line break. */
-+	if (len && line->buf[len - 1] == ' ') {
-+		strbuf_add(prev, line->buf, len - !!mi->delsp);
-+		return;
-+	}
-+
-+	/* Prepend any previous partial lines */
-+	strbuf_insert(line, 0, prev->buf, prev->len);
-+	strbuf_reset(prev);
-+
-+	handle_filter(mi, line);
-+}
-+
-  static void handle_body(struct mailinfo *mi, struct strbuf *line)
-  {
-  	struct strbuf prev = STRBUF_INIT;
-@@ -1012,7 +1069,7 @@ static void handle_body(struct mailinfo *mi, 
-struct strbuf *line)
-  						strbuf_addbuf(&prev, sb);
-  						break;
-  					}
--				handle_filter(mi, sb);
-+				handle_filter_flowed(mi, sb, &prev);
-  			}
-  			/*
-  			 * The partial chunk is saved in "prev" and will be
-@@ -1022,13 +1079,16 @@ static void handle_body(struct mailinfo *mi, 
-struct strbuf *line)
-  			break;
-  		}
-  		default:
--			handle_filter(mi, line);
-+			handle_filter_flowed(mi, line, &prev);
-  		}
-
-  		if (mi->input_error)
-  			break;
-  	} while (!strbuf_getwholeline(line, mi->input, '\n'));
-
-+	if (prev.len)
-+		handle_filter(mi, &prev);
-+
-  	flush_inbody_header_accum(mi);
-
-  handle_body_out:
--- 
-2.18.0