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git/mailinfo.c

1293 lines
29 KiB

#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 || 60 < name->len || strpbrk(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_insertstr(boundary, 0, "--");
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 skip_header(const struct strbuf *line, const char *hdr,
const char **outval)
{
const char *val;
if (!skip_iprefix(line->buf, hdr, &val) ||
*val++ != ':')
return 0;
while (isspace(*val))
val++;
*outval = val;
return 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;
size_t out_len;
if (!mi->metainfo_charset || !charset || !*charset)
return 0;
if (same_encoding(mi->metainfo_charset, charset))
return 0;
out = reencode_string_len(line->buf, line->len,
mi->metainfo_charset, charset, &out_len);
if (!out) {
mi->input_error = -1;
return error("cannot convert from %s to %s",
charset, mi->metainfo_charset);
}
strbuf_attach(line, out, out_len, out_len);
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;
}
/*
* Returns true if "line" contains a header matching "hdr", in which case "val"
* will contain the value of the header with any RFC2047 B and Q encoding
* unwrapped, and optionally normalize the meta information to utf8.
*/
static int parse_header(const struct strbuf *line,
const char *hdr,
struct mailinfo *mi,
struct strbuf *val)
{
const char *val_str;
if (!skip_header(line, hdr, &val_str))
return 0;
strbuf_addstr(val, val_str);
decode_header(mi, val);
return 1;
}
static int check_header(struct mailinfo *mi,
const struct strbuf *line,
struct strbuf *hdr_data[], int overwrite)
{
int i, ret = 0;
struct strbuf sb = STRBUF_INIT;
/* search for the interesting parts */
for (i = 0; header[i]; i++) {
if ((!hdr_data[i] || overwrite) &&
parse_header(line, header[i], mi, &sb)) {
handle_header(&hdr_data[i], &sb);
ret = 1;
goto check_header_out;
}
}
/* Content stuff */
if (parse_header(line, "Content-Type", mi, &sb)) {
handle_content_type(mi, &sb);
ret = 1;
goto check_header_out;
}
if (parse_header(line, "Content-Transfer-Encoding", mi, &sb)) {
handle_content_transfer_encoding(mi, &sb);
ret = 1;
goto check_header_out;
}
if (parse_header(line, "Message-Id", 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;
const char *val;
for (i = 0; header[i]; i++)
if (!mi->s_hdr_data[i] && skip_header(line, header[i], &val))
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)
first_nonblank = c;
if (*c == '-') {
in_perforation = 1;
perforation++;
continue;
}
if (starts_with(c, ">8") || starts_with(c, "8<") ||
starts_with(c, ">%") || starts_with(c, "%<")) {
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]);
FREE_AND_NULL(mi->s_hdr_data[i]);
}
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) {
if (len >= 2 &&
line->buf[len - 2] == '\r' &&
line->buf[len - 1] == '\n') {
mi->have_quoted_cr = 1;
if (mi->quoted_cr == quoted_cr_strip) {
strbuf_setlen(line, len - 2);
strbuf_addch(line, '\n');
len--;
}
}
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 summarize_quoted_cr(struct mailinfo *mi)
{
if (mi->have_quoted_cr &&
mi->quoted_cr == quoted_cr_warn)
warning(_("quoted CRLF detected"));
}
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);
}
summarize_quoted_cr(mi);
mi->have_quoted_cr = 0;
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)) /* 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);
summarize_quoted_cr(mi);
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 (memchr(hdr->buf, '\0', hdr->len)) {
error("a NUL byte in '%s' is not allowed.", header[i]);
mi->input_error = -1;
}
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;
}
int mailinfo_parse_quoted_cr_action(const char *actionstr, int *action)
{
if (!strcmp(actionstr, "nowarn"))
*action = quoted_cr_nowarn;
else if (!strcmp(actionstr, "warn"))
*action = quoted_cr_warn;
else if (!strcmp(actionstr, "strip"))
*action = quoted_cr_strip;
else
return -1;
return 0;
}
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;
}
if (!strcmp(var, "mailinfo.quotedcr")) {
if (mailinfo_parse_quoted_cr_action(value, &mi->quoted_cr) != 0)
return error(_("bad action '%s' for '%s'"), value, var);
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->quoted_cr = quoted_cr_warn;
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)
{
strbuf_release(&mi->name);
strbuf_release(&mi->email);
strbuf_release(&mi->charset);
strbuf_release(&mi->inbody_header_accum);
free(mi->message_id);
strbuf_list_free(mi->p_hdr_data);
strbuf_list_free(mi->s_hdr_data);
while (mi->content < mi->content_top) {
free(*(mi->content_top));
mi->content_top--;
}
strbuf_release(&mi->log_message);
}