@ -2,20 +2,32 @@
@@ -2,20 +2,32 @@
* Another stupid program, this one parsing the headers of an
* email to figure out authorship and subject
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <iconv.h>
static FILE *cmitmsg, *patchfile;
static int keep_subject = 0;
static int metainfo_utf8 = 0;
static char line[1000];
static char date[1000];
static char name[1000];
static char email[1000];
static char subject[1000];
static enum {
TE_DONTCARE, TE_QP, TE_BASE64,
} transfer_encoding;
static char charset[256];
static char multipart_boundary[1000];
static int multipart_boundary_len;
static int patch_lines = 0;
static char *sanity_check(char *name, char *email)
{
int len = strlen(name);
@ -40,67 +52,188 @@ static int handle_from(char *line)
@@ -40,67 +52,188 @@ static int handle_from(char *line)
if (*email && strchr(at+1, '@'))
return 0;
/* Pick up the string around '@', possibly delimited with <>
* pair; that is the email part. White them out while copying.
*/
while (at > line) {
char c = at[-1];
if (isspace(c) || c == '<')
if (isspace(c))
break;
if (c == '<') {
at[-1] = ' ';
break;
}
at--;
}
dst = email;
for (;;) {
unsigned char c = *at;
if (!c || c == '>' || isspace(c))
if (!c || c == '>' || isspace(c)) {
if (c == '>')
*at = ' ';
break;
}
*at++ = ' ';
*dst++ = c;
}
*dst++ = 0;
/* The remainder is name. It could be "John Doe <john.doe@xz>"
* or "john.doe@xz (John Doe)", but we have whited out the
* email part, so trim from both ends, possibly removing
* the () pair at the end.
*/
at = line + strlen(line);
while (at > line) {
unsigned char c = *--at;
if (isalnum(c))
if (!isspace(c)) {
at[(c == ')') ? 0 : 1] = 0;
break;
*at = 0;
}
}
at = line;
for (;;) {
unsigned char c = *at;
if (!c)
break;
if (isalnum(c))
if (!c || !isspace(c)) {
if (c == '(')
at++;
break;
}
at++;
}
at = sanity_check(at, email);
strcpy(name, at);
return 1;
}
static void handle_date(char *line)
static int handle_date(char *line)
{
strcpy(date, line);
return 0;
}
static void handle_subject(char *line)
static int handle_subject(char *line)
{
strcpy(subject, line);
return 0;
}
/* 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, char *attr)
{
char *ends, *ap = strcasestr(line, name);
size_t sz;
if (!ap) {
*attr = 0;
return 0;
}
ap += strlen(name);
if (*ap == '"') {
ap++;
ends = "\"";
}
else
ends = "; \t";
sz = strcspn(ap, ends);
memcpy(attr, ap, sz);
attr[sz] = 0;
return 1;
}
static int handle_subcontent_type(char *line)
{
/* We do not want to mess with boundary. Note that we do not
* handle nested multipart.
*/
slurp_attr(line, "charset=", charset);
if (*charset) {
int i, c;
for (i = 0; (c = charset[i]) != 0; i++)
charset[i] = tolower(c);
}
return 0;
}
static int handle_content_type(char *line)
{
*multipart_boundary = 0;
if (slurp_attr(line, "boundary=", multipart_boundary + 2)) {
memcpy(multipart_boundary, "--", 2);
multipart_boundary_len = strlen(multipart_boundary);
}
slurp_attr(line, "charset=", charset);
return 0;
}
static int handle_content_transfer_encoding(char *line)
{
if (strcasestr(line, "base64"))
transfer_encoding = TE_BASE64;
else if (strcasestr(line, "quoted-printable"))
transfer_encoding = TE_QP;
else
transfer_encoding = TE_DONTCARE;
return 0;
}
static void check_line(char *line, int len)
static int is_multipart_boundary(const char *line)
{
return (!memcmp(line, multipart_boundary, multipart_boundary_len));
}
static int eatspace(char *line)
{
if (!memcmp(line, "From:", 5) && isspace(line[5]))
handle_from(line+6);
else if (!memcmp(line, "Date:", 5) && isspace(line[5]))
handle_date(line+6);
else if (!memcmp(line, "Subject:", 8) && isspace(line[8]))
handle_subject(line+9);
int len = strlen(line);
while (len > 0 && isspace(line[len-1]))
line[--len] = 0;
return len;
}
static char * cleanup_subject(char *subject)
#define SEEN_FROM 01
#define SEEN_DATE 02
#define SEEN_SUBJECT 04
/* First lines of body can have From:, Date:, and Subject: */
static int handle_inbody_header(int *seen, char *line)
{
if (!memcmp("From:", line, 5) && isspace(line[5])) {
if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
*seen |= SEEN_FROM;
return 1;
}
}
if (!memcmp("Date:", line, 5) && isspace(line[5])) {
if (!(*seen & SEEN_DATE)) {
handle_date(line+6);
*seen |= SEEN_DATE;
return 1;
}
}
if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
if (!(*seen & SEEN_SUBJECT)) {
handle_subject(line+9);
*seen |= SEEN_SUBJECT;
return 1;
}
}
if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
if (!(*seen & SEEN_SUBJECT)) {
handle_subject(line);
*seen |= SEEN_SUBJECT;
return 1;
}
}
return 0;
}
static char *cleanup_subject(char *subject)
{
if (keep_subject)
return subject;
@ -153,109 +286,435 @@ static void cleanup_space(char *buf)
@@ -153,109 +286,435 @@ static void cleanup_space(char *buf)
}
}
static void handle_rest(void)
typedef int (*header_fn_t)(char *);
struct header_def {
const char *name;
header_fn_t func;
int namelen;
};
static void check_header(char *line, int len, struct header_def *header)
{
int i;
if (header[0].namelen <= 0) {
for (i = 0; header[i].name; i++)
header[i].namelen = strlen(header[i].name);
}
for (i = 0; header[i].name; i++) {
int len = header[i].namelen;
if (!strncasecmp(line, header[i].name, len) &&
line[len] == ':' && isspace(line[len + 1])) {
header[i].func(line + len + 2);
break;
}
}
}
static void check_subheader_line(char *line, int len)
{
static struct header_def header[] = {
{ "Content-Type", handle_subcontent_type },
{ "Content-Transfer-Encoding",
handle_content_transfer_encoding },
{ NULL },
};
check_header(line, len, header);
}
static void check_header_line(char *line, int len)
{
static struct header_def header[] = {
{ "From", handle_from },
{ "Date", handle_date },
{ "Subject", handle_subject },
{ "Content-Type", handle_content_type },
{ "Content-Transfer-Encoding",
handle_content_transfer_encoding },
{ NULL },
};
check_header(line, len, header);
}
static int read_one_header_line(char *line, int sz, FILE *in)
{
int ofs = 0;
while (ofs < sz) {
int peek, len;
if (fgets(line + ofs, sz - ofs, in) == NULL)
return ofs;
len = eatspace(line + ofs);
if (len == 0)
return ofs;
peek = fgetc(in); ungetc(peek, in);
if (peek == ' ' || peek == '\t') {
/* Yuck, 2822 header "folding" */
ofs += len;
continue;
}
return ofs + len;
}
return ofs;
}
static unsigned hexval(int c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return ~0;
}
static int decode_q_segment(char *in, char *ot, char *ep)
{
int c;
while ((c = *in++) != 0 && (in <= ep)) {
if (c == '=') {
int d = *in++;
if (d == '\n' || !d)
break; /* drop trailing newline */
*ot++ = ((hexval(d) << 4) | hexval(*in++));
}
else
*ot++ = c;
}
*ot = 0;
return 0;
}
static int decode_b_segment(char *in, char *ot, char *ep)
{
/* Decode in..ep, possibly in-place to ot */
int c, pos = 0, acc = 0;
while ((c = *in++) != 0 && (in <= ep)) {
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 if (c == '=') {
/* padding is almost like (c == 0), except we do
* not output NUL resulting only from it;
* for now we just trust the data.
*/
c = 0;
}
else
continue; /* garbage */
switch (pos++) {
case 0:
acc = (c << 2);
break;
case 1:
*ot++ = (acc | (c >> 4));
acc = (c & 15) << 4;
break;
case 2:
*ot++ = (acc | (c >> 2));
acc = (c & 3) << 6;
break;
case 3:
*ot++ = (acc | c);
acc = pos = 0;
break;
}
}
*ot = 0;
return 0;
}
static void convert_to_utf8(char *line, char *charset)
{
if (*charset) {
char *in, *out;
size_t insize, outsize, nrc;
char outbuf[4096]; /* cheat */
iconv_t conv = iconv_open("utf-8", charset);
if (conv == (iconv_t) -1) {
fprintf(stderr, "cannot convert from %s to utf-8\n",
charset);
*charset = 0;
return;
}
in = line;
insize = strlen(in);
out = outbuf;
outsize = sizeof(outbuf);
nrc = iconv(conv, &in, &insize, &out, &outsize);
iconv_close(conv);
if (nrc == (size_t) -1)
return;
*out = 0;
strcpy(line, outbuf);
}
}
static void decode_header_bq(char *it)
{
char *in, *out, *ep, *cp, *sp;
char outbuf[1000];
in = it;
out = outbuf;
while ((ep = strstr(in, "=?")) != NULL) {
int sz, encoding;
char charset_q[256], piecebuf[256];
if (in != ep) {
sz = ep - in;
memcpy(out, in, sz);
out += sz;
in += sz;
}
/* E.g.
* ep : "=?iso-2022-jp?B?GyR...?= foo"
* ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
*/
ep += 2;
cp = strchr(ep, '?');
if (!cp)
return; /* no munging */
for (sp = ep; sp < cp; sp++)
charset_q[sp - ep] = tolower(*sp);
charset_q[cp - ep] = 0;
encoding = cp[1];
if (!encoding || cp[2] != '?')
return; /* no munging */
ep = strstr(cp + 3, "?=");
if (!ep)
return; /* no munging */
switch (tolower(encoding)) {
default:
return; /* no munging */
case 'b':
sz = decode_b_segment(cp + 3, piecebuf, ep);
break;
case 'q':
sz = decode_q_segment(cp + 3, piecebuf, ep);
break;
}
if (sz < 0)
return;
if (metainfo_utf8)
convert_to_utf8(piecebuf, charset_q);
strcpy(out, piecebuf);
out += strlen(out);
in = ep + 2;
}
strcpy(out, in);
strcpy(it, outbuf);
}
static void decode_transfer_encoding(char *line)
{
char *ep;
switch (transfer_encoding) {
case TE_QP:
ep = line + strlen(line);
decode_q_segment(line, line, ep);
break;
case TE_BASE64:
ep = line + strlen(line);
decode_b_segment(line, line, ep);
break;
case TE_DONTCARE:
break;
}
}
static void handle_info(void)
{
FILE *out = cmitmsg;
char *sub = cleanup_subject(subject);
char *sub;
static int done_info = 0;
if (done_info)
return;
done_info = 1;
sub = cleanup_subject(subject);
cleanup_space(name);
cleanup_space(date);
cleanup_space(email);
cleanup_space(sub);
printf("Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n", name, email, sub, date);
/* Unwrap inline B and Q encoding, and optionally
* normalize the meta information to utf8.
*/
decode_header_bq(name);
decode_header_bq(date);
decode_header_bq(email);
decode_header_bq(sub);
printf("Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
name, email, sub, date);
}
/* We are inside message body and have read line[] already.
* Spit out the commit log.
*/
static int handle_commit_msg(void)
{
if (!cmitmsg)
return 0;
do {
if (!memcmp("diff -", line, 6) ||
!memcmp("---", line, 3) ||
!memcmp("Index: ", line, 7))
out = patchfile;
break;
if ((multipart_boundary[0] && is_multipart_boundary(line))) {
/* We come here when the first part had only
* the commit message without any patch. We
* pretend we have not seen this line yet, and
* go back to the loop.
*/
return 1;
}
fputs(line, out);
/* Unwrap transfer encoding and optionally
* normalize the log message to UTF-8.
*/
decode_transfer_encoding(line);
if (metainfo_utf8)
convert_to_utf8(line, charset);
fputs(line, cmitmsg);
} while (fgets(line, sizeof(line), stdin) != NULL);
if (out == cmitmsg) {
fprintf(stderr, "No patch found\n");
exit(1);
}
fclose(cmitmsg);
fclose(patchfile);
cmitmsg = NULL;
return 0;
}
static int eatspace(char *line)
/* We have done the commit message and have the first
* line of the patch in line[].
*/
static void handle_patch(void)
{
int len = strlen(line);
while (len > 0 && isspace(line[len-1]))
line[--len] = 0;
return len;
do {
if (multipart_boundary[0] && is_multipart_boundary(line))
break;
/* Only unwrap transfer encoding but otherwise do not
* do anything. We do *NOT* want UTF-8 conversion
* here; we are dealing with the user payload.
*/
decode_transfer_encoding(line);
fputs(line, patchfile);
patch_lines++;
} while (fgets(line, sizeof(line), stdin) != NULL);
}
static void handle_body(void)
/* multipart boundary and transfer encoding are set up for us, and we
* are at the end of the sub header. do equivalent of handle_body up
* to the next boundary without closing patchfile --- we will expect
* that the first part to contain commit message and a patch, and
* handle other parts as pure patches.
*/
static int handle_multipart_one_part(void)
{
int has_from = 0;
int has_date = 0;
int seen = 0;
int n = 0;
int len;
/* First lines of body can have From: and Date: */
while (fgets(line, sizeof(line), stdin) != NULL) {
int len = eatspace(line);
again:
len = eatspace(line);
n++;
if (!len)
continue;
if (!memcmp("From:", line, 5) && isspace(line[5])) {
if (!has_from && handle_from(line+6)) {
has_from = 1;
continue;
}
}
if (!memcmp("Date:", line, 5) && isspace(line[5])) {
if (!has_date) {
handle_date(line+6);
has_date = 1;
continue;
}
}
if (is_multipart_boundary(line))
break;
if (0 <= seen && handle_inbody_header(&seen, line))
continue;
seen = -1; /* no more inbody headers */
line[len] = '\n';
handle_rest();
handle_info();
if (handle_commit_msg())
goto again;
handle_patch();
break;
}
if (n == 0)
return -1;
return 0;
}
static int read_one_header_line(char *line, int sz, FILE *in)
static void handle_multipart_body(void)
{
int ofs = 0;
while (ofs < sz) {
int peek, len;
if (fgets(line + ofs, sz - ofs, in) == NULL)
return ofs;
len = eatspace(line + ofs);
if (len == 0)
return ofs;
peek = fgetc(in); ungetc(peek, in);
if (peek == ' ' || peek == '\t') {
/* Yuck, 2822 header "folding" */
ofs += len;
continue;
int part_num = 0;
/* Skip up to the first boundary */
while (fgets(line, sizeof(line), stdin) != NULL)
if (is_multipart_boundary(line)) {
part_num = 1;
break;
}
return ofs + len;
if (!part_num)
return;
/* We are on boundary line. Start slurping the subhead. */
while (1) {
int len = read_one_header_line(line, sizeof(line), stdin);
if (!len) {
if (handle_multipart_one_part() < 0)
return;
}
else
check_subheader_line(line, len);
}
fclose(patchfile);
if (!patch_lines) {
fprintf(stderr, "No patch found\n");
exit(1);
}
return ofs;
}
static void usage(void)
/* Non multipart message */
static void handle_body(void)
{
fprintf(stderr, "mailinfo msg-file patch-file < email\n");
exit(1);
int seen = 0;
while (fgets(line, sizeof(line), stdin) != NULL) {
int len = eatspace(line);
if (!len)
continue;
if (0 <= seen && handle_inbody_header(&seen, line))
continue;
seen = -1; /* no more inbody headers */
line[len] = '\n';
handle_info();
handle_commit_msg();
handle_patch();
break;
}
fclose(patchfile);
if (!patch_lines) {
fprintf(stderr, "No patch found\n");
exit(1);
}
}
static const char mailinfo_usage[] =
"git-mailinfo [-k] msg patch <mail >info";
int main(int argc, char ** argv)
"git-mailinfo [-k] [-u] msg patch <mail >info";
static void usage(void) {
fprintf(stderr, "%s\n", mailinfo_usage);
exit(1);
}
int main(int argc, char **argv)
{
while (1 < argc && argv[1][0] == '-') {
if (!strcmp(argv[1], "-k"))
keep_subject = 1;
else {
fprintf(stderr, "usage: %s\n", mailinfo_usage);
exit(1);
}
else if (!strcmp(argv[1], "-u"))
metainfo_utf8 = 1;
else
usage();
argc--; argv++;
}
@ -274,10 +733,13 @@ int main(int argc, char ** argv)
@@ -274,10 +733,13 @@ int main(int argc, char ** argv)
while (1) {
int len = read_one_header_line(line, sizeof(line), stdin);
if (!len) {
handle_body();
if (multipart_boundary[0])
handle_multipart_body();
else
handle_body();
break;
}
check_line(line, len);
check_header_line(line, len);
}
return 0;
}
Junio C Hamano
20 years ago