misc: Add `vformat_len_copy()`

This works the same as `vformat_len()`, except that it copies `args`
into a temporary `va_list`.

This can be useful when you're already using a `va_list`, and thus need
to copy the list already.

1 files changed, 1 insertions, 0 deletions

diff --git a/misc.h b/misc.h
index 9110197..eb839de 100644
--- a/misc.h
+++ b/misc.h
@@ -18,6 +18,7 @@ extern char *find_alpha(const char *str);
 extern char *create_num_str(const char *str, int num);
 extern int is_empty(const char *str);
 extern char *skip_whitespace(const char *str);
+extern int vformat_len_copy(const char *fmt, va_list args);
 extern int vformat_len(const char *fmt, va_list args);
 extern int format_len(const char *fmt, ...);
 extern int is_dir(const char *path);