1 files changed, 61 insertions, 2 deletions
diff --git a/src/nvim/mbyte.h b/src/nvim/mbyte.h
index 0cfe2c4bab..ed48705c6d 100644
--- a/src/nvim/mbyte.h
+++ b/src/nvim/mbyte.h
@@ -1,7 +1,14 @@
 #ifndef NVIM_MBYTE_H
 #define NVIM_MBYTE_H
 
+#include <stdint.h>
 #include <stdbool.h>
+#include <string.h>
+
+#include "nvim/iconv.h"
+#include "nvim/func_attr.h"
+#include "nvim/os/os_defs.h"  // For indirect
+#include "nvim/types.h"  // for char_u
 
 /*
  * Return byte length of character that starts with byte "b".
@@ -9,8 +16,11 @@
  * MB_BYTE2LEN_CHECK() can be used to count a special key as one byte.
  * Don't call MB_BYTE2LEN(b) with b < 0 or b > 255!
  */
-#define MB_BYTE2LEN(b)         mb_bytelen_tab[b]
-#define MB_BYTE2LEN_CHECK(b)   (((b) < 0 || (b) > 255) ? 1 : mb_bytelen_tab[b])
+#define MB_BYTE2LEN(b)         utf8len_tab[b]
+#define MB_BYTE2LEN_CHECK(b)   (((b) < 0 || (b) > 255) ? 1 : utf8len_tab[b])
+
+// max length of an unicode char
+#define MB_MAXCHAR     6
 
 /* properties used in enc_canon_table[] (first three mutually exclusive) */
 #define ENC_8BIT       0x01
@@ -28,7 +38,56 @@
 #define ENC_LATIN9     0x400       /* Latin9 */
 #define ENC_MACROMAN   0x800       /* Mac Roman (not Macro Man! :-) */
 
+// TODO(bfredl): eventually we should keep only one of the namings
+#define mb_ptr2len utfc_ptr2len
+#define mb_char2len utf_char2len
+#define mb_char2cells utf_char2cells
+
+/// 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;
+
+#define MBYTE_NONE_CONV { \
+  .vc_type = CONV_NONE, \
+  .vc_factor = 1, \
+  .vc_fail = false, \
+}
+
+/// 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;
+
+extern const uint8_t utf8len_tab_zero[256];
+
+extern const uint8_t utf8len_tab[256];
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "mbyte.h.generated.h"
 #endif
+
+static inline int mb_strcmp_ic(bool ic, const char *s1, const char *s2)
+  REAL_FATTR_NONNULL_ALL REAL_FATTR_PURE REAL_FATTR_WARN_UNUSED_RESULT;
+
+/// Compare strings
+///
+/// @param[in]  ic  True if case is to be ignored.
+///
+/// @return 0 if s1 == s2, <0 if s1 < s2, >0 if s1 > s2.
+static inline int mb_strcmp_ic(bool ic, const char *s1, const char *s2)
+{
+  return (ic ? mb_stricmp(s1, s2) : strcmp(s1, s2));
+}
 #endif  // NVIM_MBYTE_H