Add MIME part boundary generation function

src/fmail.c

@@ -74,6 +74,21 @@ See the COPYING file or <http://www.gnu.org/licenses/gpl.html>.\n\
 
 /* Helper functions. */
 
+static char *
+generate_boundary(char *buffer, size_t len)
+{
+    static const char chars[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                                "abcdefghijklmnopqrstuvwxyz"
+                                "0123456789+/";
+    int i;
+
+    for ( i = 0; i < len - 1; i++ )
+        buffer[i] = chars[rand() % (sizeof(chars) - 1)];
+    buffer[i] = '\0';
+
+    return buffer;
+}
+
 static void
 qp_encode_stream(FILE *in, FILE *out)
 {
@@ -214,6 +229,7 @@ main(int argc, char *argv[])
 
     setprogname(argv[0]);
     setlocale(LC_ALL, "");
+    srand(time(NULL));
 
     headers = sb_new(0);
     sign_ctx = NULL;