Experimental rfc822 output helper that folds lines

[citadel.git] / citadel / sysdep.c

diff --git a/citadel/sysdep.c b/citadel/sysdep.c
index d79785a5a5ebebf1d9dc93473ec9dce08f9eafdc..975585c0fe1a897edfa8c4e4a7f5e4f72df1094a 100644 (file)
--- a/citadel/sysdep.c
+++ b/citadel/sysdep.c
@@ -707,9 +707,8 @@ int client_write(char *buf, int nbytes)
 
 
 /*
- * cprintf()  ...   Send formatted printable data to the client.   It is
- *               implemented in terms of client_write() but remains in
- *               sysdep.c in case we port to somewhere without va_args...
+ * cprintf()   Send formatted printable data to the client.
+ *             Implemented in terms of client_write() so it's technically not sysdep...
  */
 void cprintf(const char *format, ...) {   
        va_list arg_ptr;   
@@ -723,6 +722,43 @@ void cprintf(const char *format, ...) {
 }   
 
 
+/*
+ * fold_cprintf()      Like cprintf() except it can do RFC2822-style header folding.
+ */
+void fold_cprintf(const char *format, ...) {   
+       va_list arg_ptr;   
+       char buf[4096];
+       int len;
+       char *bbuf;
+       char *ptr;
+   
+       va_start(arg_ptr, format);   
+       if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
+               buf[sizeof buf - 2] = '\n';
+       va_end(arg_ptr);
+
+       len = strlen(buf);
+       bbuf = buf;
+
+       while (len > 998) {
+               ptr = strchr(&bbuf[900], ',');
+               if (ptr == NULL) {
+                       ptr = bbuf+990;
+               }
+               if ((ptr - bbuf) > 990) {
+                       ptr = bbuf+990;
+               }
+               ++ptr;
+               client_write(bbuf, ptr-bbuf);
+               client_write("\r\n\t", 3);
+               len -= (ptr-bbuf);
+               bbuf = ptr++;
+       }
+
+       client_write(bbuf, len);
+}   
+
+
 /*
  * Read data from the client socket.
  * Return values are: