2005-04-12 06:46:50 +00:00
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/*
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* Another stupid program, this one parsing the headers of an
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* email to figure out authorship and subject
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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2005-06-23 16:40:23 +00:00
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static FILE *cmitmsg, *patchfile;
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2005-04-12 06:46:50 +00:00
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static char line[1000];
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2005-05-02 04:42:53 +00:00
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static char date[1000];
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2005-04-12 06:46:50 +00:00
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static char name[1000];
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static char email[1000];
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static char subject[1000];
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static char *sanity_check(char *name, char *email)
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{
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int len = strlen(name);
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if (len < 3 || len > 60)
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return email;
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if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
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return email;
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return name;
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}
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static int handle_from(char *line)
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{
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char *at = strchr(line, '@');
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char *dst;
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if (!at)
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return 0;
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/*
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* If we already have one email, don't take any confusing lines
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*/
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if (*email && strchr(at+1, '@'))
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return 0;
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while (at > line) {
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char c = at[-1];
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if (isspace(c) || c == '<')
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break;
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at--;
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}
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dst = email;
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for (;;) {
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unsigned char c = *at;
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if (!c || c == '>' || isspace(c))
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break;
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*at++ = ' ';
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*dst++ = c;
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}
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*dst++ = 0;
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at = line + strlen(line);
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while (at > line) {
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unsigned char c = *--at;
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if (isalnum(c))
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break;
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*at = 0;
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}
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at = line;
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for (;;) {
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unsigned char c = *at;
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if (!c)
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break;
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if (isalnum(c))
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break;
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at++;
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}
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at = sanity_check(at, email);
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strcpy(name, at);
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return 1;
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}
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2005-05-02 04:42:53 +00:00
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static void handle_date(char *line)
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{
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strcpy(date, line);
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}
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2005-04-12 06:46:50 +00:00
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static void handle_subject(char *line)
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{
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strcpy(subject, line);
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}
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static void check_line(char *line, int len)
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{
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2005-07-23 09:10:31 +00:00
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if (!memcmp(line, "From:", 5) && isspace(line[5]))
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2005-04-12 06:46:50 +00:00
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handle_from(line+6);
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2005-07-23 09:10:31 +00:00
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else if (!memcmp(line, "Date:", 5) && isspace(line[5]))
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2005-05-02 04:42:53 +00:00
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handle_date(line+6);
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2005-07-23 09:10:31 +00:00
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else if (!memcmp(line, "Subject:", 8) && isspace(line[8]))
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2005-04-12 06:46:50 +00:00
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handle_subject(line+9);
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}
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static char * cleanup_subject(char *subject)
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{
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for (;;) {
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char *p;
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int len, remove;
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switch (*subject) {
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case 'r': case 'R':
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if (!memcmp("e:", subject+1, 2)) {
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subject +=3;
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continue;
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}
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break;
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case ' ': case '\t': case ':':
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subject++;
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continue;
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case '[':
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p = strchr(subject, ']');
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if (!p) {
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subject++;
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continue;
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}
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len = strlen(p);
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remove = p - subject;
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if (remove <= len *2) {
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subject = p+1;
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continue;
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}
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break;
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}
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return subject;
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}
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}
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static void cleanup_space(char *buf)
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{
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unsigned char c;
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while ((c = *buf) != 0) {
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buf++;
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if (isspace(c)) {
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buf[-1] = ' ';
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c = *buf;
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while (isspace(c)) {
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int len = strlen(buf);
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memmove(buf, buf+1, len);
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c = *buf;
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}
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}
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}
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}
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static void handle_rest(void)
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{
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2005-08-04 03:35:37 +00:00
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FILE *out = cmitmsg;
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2005-04-12 06:46:50 +00:00
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char *sub = cleanup_subject(subject);
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cleanup_space(name);
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2005-05-02 04:42:53 +00:00
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cleanup_space(date);
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2005-04-12 06:46:50 +00:00
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cleanup_space(email);
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cleanup_space(sub);
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2005-05-02 04:42:53 +00:00
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printf("Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n", name, email, sub, date);
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2005-04-12 06:46:50 +00:00
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do {
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2005-06-23 16:40:23 +00:00
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if (!memcmp("diff -", line, 6) ||
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2005-06-23 18:00:23 +00:00
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!memcmp("---", line, 3) ||
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!memcmp("Index: ", line, 7))
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2005-04-12 06:46:50 +00:00
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out = patchfile;
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fputs(line, out);
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} while (fgets(line, sizeof(line), stdin) != NULL);
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if (out == cmitmsg) {
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fprintf(stderr, "No patch found\n");
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exit(1);
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}
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fclose(cmitmsg);
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fclose(patchfile);
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}
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static int eatspace(char *line)
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{
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int len = strlen(line);
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while (len > 0 && isspace(line[len-1]))
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line[--len] = 0;
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return len;
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}
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static void handle_body(void)
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{
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int has_from = 0;
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2005-07-22 23:04:34 +00:00
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int has_date = 0;
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2005-04-12 06:46:50 +00:00
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2005-07-22 23:04:34 +00:00
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/* First lines of body can have From: and Date: */
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2005-04-12 06:46:50 +00:00
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while (fgets(line, sizeof(line), stdin) != NULL) {
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int len = eatspace(line);
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if (!len)
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continue;
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if (!memcmp("From:", line, 5) && isspace(line[5])) {
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if (!has_from && handle_from(line+6)) {
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has_from = 1;
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continue;
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}
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}
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2005-07-22 23:04:34 +00:00
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if (!memcmp("Date:", line, 5) && isspace(line[5])) {
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if (!has_date) {
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handle_date(line+6);
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has_date = 1;
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continue;
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}
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}
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2005-04-12 06:46:50 +00:00
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line[len] = '\n';
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handle_rest();
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break;
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}
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}
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2005-07-23 09:10:31 +00:00
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static int read_one_header_line(char *line, int sz, FILE *in)
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{
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int ofs = 0;
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while (ofs < sz) {
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int peek, len;
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if (fgets(line + ofs, sz - ofs, in) == NULL)
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return ofs;
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len = eatspace(line + ofs);
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if (len == 0)
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return ofs;
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peek = fgetc(in); ungetc(peek, in);
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if (peek == ' ' || peek == '\t') {
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/* Yuck, 2822 header "folding" */
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ofs += len;
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continue;
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}
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return ofs + len;
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}
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return ofs;
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}
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2005-04-12 06:46:50 +00:00
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static void usage(void)
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{
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2005-07-23 09:10:31 +00:00
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fprintf(stderr, "mailinfo msg-file patch-file < email\n");
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2005-04-12 06:46:50 +00:00
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exit(1);
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}
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int main(int argc, char ** argv)
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{
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2005-06-23 16:40:23 +00:00
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if (argc != 3)
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2005-04-12 06:46:50 +00:00
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usage();
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cmitmsg = fopen(argv[1], "w");
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if (!cmitmsg) {
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perror(argv[1]);
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exit(1);
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}
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patchfile = fopen(argv[2], "w");
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if (!patchfile) {
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perror(argv[2]);
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exit(1);
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}
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2005-07-23 09:10:31 +00:00
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while (1) {
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int len = read_one_header_line(line, sizeof(line), stdin);
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2005-04-12 06:46:50 +00:00
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if (!len) {
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handle_body();
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break;
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}
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check_line(line, len);
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}
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return 0;
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}
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