[PATCH] mailinfo: handle folded header.

Some people split their long E-mail address over two lines
using the RFC2822 header "folding".  We can lose authorship
information this way, so make a minimum effort to deal with it,
instead of special casing only the "Subject:" field.

We could teach mailsplit to unfold the folded header, but
teaching mailinfo about folding would make more sense; a single
message can be fed to mailinfo without going through mailsplit.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/tools/mailinfo.c b/tools/mailinfo.c
index 4dcc099..5a857f7 100644 (file)
--- a/tools/mailinfo.c
+++ b/tools/mailinfo.c
@@ -89,45 +89,14 @@ static void handle_subject(char *line)
        strcpy(subject, line);
 }
 
-static void add_subject_line(char *line)
-{
-       while (isspace(*line))
-               line++;
-       *--line = ' ';
-       strcat(subject, line);
-}
-
 static void check_line(char *line, int len)
 {
-       static int cont = -1;
-       if (!memcmp(line, "From:", 5) && isspace(line[5])) {
+       if (!memcmp(line, "From:", 5) && isspace(line[5]))
                handle_from(line+6);
-               cont = 0;
-               return;
-       }
-       if (!memcmp(line, "Date:", 5) && isspace(line[5])) {
+       else if (!memcmp(line, "Date:", 5) && isspace(line[5]))
                handle_date(line+6);
-               cont = 0;
-               return;
-       }
-       if (!memcmp(line, "Subject:", 8) && isspace(line[8])) {
+       else if (!memcmp(line, "Subject:", 8) && isspace(line[8]))
                handle_subject(line+9);
-               cont = 1;
-               return;
-       }
-       if (isspace(*line)) {
-               switch (cont) {
-               case 0:
-                       fprintf(stderr, "I don't do 'Date:' or 'From:' line continuations\n");
-                       break;
-               case 1:
-                       add_subject_line(line);
-                       return;
-               default:
-                       break;
-               }
-       }
-       cont = -1;
 }
 
 static char * cleanup_subject(char *subject)
@@ -246,9 +215,30 @@ static void handle_body(void)
        }
 }
 
+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 void usage(void)
 {
-       fprintf(stderr, "mailinfo msg-file path-file < email\n");
+       fprintf(stderr, "mailinfo msg-file patch-file < email\n");
        exit(1);
 }
 
@@ -266,8 +256,8 @@ int main(int argc, char ** argv)
                perror(argv[2]);
                exit(1);
        }
-       while (fgets(line, sizeof(line), stdin) != NULL) {
-               int len = eatspace(line);
+       while (1) {
+               int len = read_one_header_line(line, sizeof(line), stdin);
                if (!len) {
                        handle_body();
                        break;