eval: Split eval.c into smaller files

src/nvim/mbyte.h

@@ -3,6 +3,8 @@
 
 #include <stdbool.h>
 
+#include "nvim/iconv.h"
+
 /*
  * Return byte length of character that starts with byte "b".
  * Returns 1 for a single-byte character.
@@ -40,6 +42,27 @@
 #define mb_ptr2char utf_ptr2char
 #define mb_head_off utf_head_off
 
+/// Flags for vimconv_T
+typedef enum {
+  CONV_NONE      = 0,
+  CONV_TO_UTF8   = 1,
+  CONV_9_TO_UTF8 = 2,
+  CONV_TO_LATIN1 = 3,
+  CONV_TO_LATIN9 = 4,
+  CONV_ICONV     = 5,
+} ConvFlags;
+
+/// Structure used for string conversions
+typedef struct {
+  int vc_type;  ///< Zero or more ConvFlags.
+  int vc_factor;  ///< Maximal expansion factor.
+# ifdef USE_ICONV
+  iconv_t vc_fd;  ///< Value for CONV_ICONV.
+# endif
+  bool vc_fail;  ///< What to do with invalid characters: if true, fail,
+                 ///< otherwise use '?'.
+} vimconv_T;
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "mbyte.h.generated.h"
 #endif