printf: extract clovers printf impl

Also make the code cleaner and simplier.

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17334>

src/util/u_printf.h

@@ -29,6 +29,13 @@
 extern "C" {
 #endif
 
+typedef struct u_printf_info {
+   unsigned num_args;
+   unsigned *arg_sizes;
+   unsigned string_size;
+   char *strings;
+} u_printf_info;
+
 /* find next valid printf specifier in a C string wrapper */
 size_t util_printf_next_spec_pos(const char *str, size_t pos);
 
@@ -39,6 +46,9 @@ size_t util_printf_next_spec_pos(const char *str, size_t pos);
  */
 size_t u_printf_length(const char *fmt, va_list untouched_args);
 
+void u_printf(FILE *out, const char *buffer, size_t buffer_size,
+              const u_printf_info*, unsigned info_size);
+
 #ifdef __cplusplus
 }
 #endif