text: #ifndef NVIM_MBYTE_H
  #define NVIM_MBYTE_H
  
  #include <stdbool.h>
  #include <string.h>
  
  #include "nvim/iconv.h"
  #include "nvim/func_attr.h"
  #include "nvim/os/os_defs.h"  // For WCHAR, indirect
  
  /*
   * Return byte length of character that starts with byte "b".
   * Returns 1 for a single-byte character.
   * 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)         utf8len_tab[b]
  #define MB_BYTE2LEN_CHECK(b)   (((b) < 0 || (b) > 255) ? 1 : utf8len_tab[b])
  
  /* properties used in enc_canon_table[] (first three mutually exclusive) */
  #define ENC_8BIT       0x01
  #define ENC_DBCS       0x02
  #define ENC_UNICODE    0x04
  
  #define ENC_ENDIAN_B   0x10        /* Unicode: Big endian */
  #define ENC_ENDIAN_L   0x20        /* Unicode: Little endian */
  
  #define ENC_2BYTE      0x40        /* Unicode: UCS-2 */
  #define ENC_4BYTE      0x80        /* Unicode: UCS-4 */
  #define ENC_2WORD      0x100       /* Unicode: UTF-16 */
  
  #define ENC_LATIN1     0x200       /* Latin1 */
  #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_ptr2len_len utfc_ptr2len_len
  #define mb_char2len utf_char2len
  #define mb_char2bytes utf_char2bytes
  #define mb_ptr2cells utf_ptr2cells
  #define mb_ptr2cells_len utf_ptr2cells_len
  #define mb_char2cells utf_char2cells
  #define mb_off2cells utf_off2cells
  #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
  
  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
  