--- a/src/lib-imap/imap-util.c	Fri Feb 06 13:38:26 2009 -0500
+++ b/src/lib-imap/imap-util.c	Fri Feb 06 13:38:54 2009 -0500
@@ -3,7 +3,9 @@
 #include "lib.h"
 #include "array.h"
 #include "str.h"
+#include "strescape.h"
 #include "mail-types.h"
+#include "imap-parser.h"
 #include "imap-util.h"
 
 void imap_write_flags(string_t *dest, enum mail_flags flags,
@@ -52,3 +54,51 @@
 			str_printfa(dest, ":%u", range[i].seq2);
 	}
 }
+
+void imap_args_to_str(string_t *dest, const struct imap_arg *args)
+{
+	const ARRAY_TYPE(imap_arg_list) *list;
+	bool first = TRUE;
+
+	for (; args->type != IMAP_ARG_EOL; args++) {
+		if (first)
+			first = FALSE;
+		else
+			str_append_c(dest, ' ');
+
+		switch (args->type) {
+		case IMAP_ARG_NIL:
+			str_append(dest, "NIL");
+			break;
+		case IMAP_ARG_ATOM:
+			str_append(dest, IMAP_ARG_STR(args));
+			break;
+		case IMAP_ARG_STRING:
+			str_append_c(dest, '"');
+			str_append(dest, str_escape(IMAP_ARG_STR(args)));
+			str_append_c(dest, '"');
+			break;
+		case IMAP_ARG_LITERAL: {
+			const char *strarg = IMAP_ARG_STR(args);
+			str_printfa(dest, "{%"PRIuSIZE_T"}\r\n",
+				    strlen(strarg));
+			str_append(dest, strarg);
+			break;
+		}
+		case IMAP_ARG_LIST:
+			str_append_c(dest, '(');
+			list = IMAP_ARG_LIST(args);
+			imap_args_to_str(dest, array_idx(list, 0));
+			str_append_c(dest, ')');
+			break;
+		case IMAP_ARG_LITERAL_SIZE:
+		case IMAP_ARG_LITERAL_SIZE_NONSYNC:
+			str_printfa(dest, "{%"PRIuUOFF_T"}\r\n",
+				    IMAP_ARG_LITERAL_SIZE(args));
+			str_append(dest, "<too large>");
+			break;
+		case IMAP_ARG_EOL:
+			i_unreached();
+		}
+	}
+}

--- a/src/lib-imap/imap-util.h	Fri Feb 06 13:38:26 2009 -0500
+++ b/src/lib-imap/imap-util.h	Fri Feb 06 13:38:54 2009 -0500
@@ -4,6 +4,7 @@
 #include "seq-range-array.h"
 
 enum mail_flags;
+struct imap_arg;
 
 /* Write flags as a space separated string. */
 void imap_write_flags(string_t *dest, enum mail_flags flags,
@@ -11,5 +12,7 @@
 
 /* Write sequence range as IMAP sequence-set */
 void imap_write_seq_range(string_t *dest, const ARRAY_TYPE(seq_range) *array);
+/* Write IMAP args to given string. The string is mainly useful for humans. */
+void imap_args_to_str(string_t *dest, const struct imap_arg *args);
 
 #endif