lib/uniwidth.in.h

   1 /* Display width functions.
   2    Copyright (C) 2001-2002, 2005, 2007, 2009-2021 Free Software Foundation,
   3    Inc.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _UNIWIDTH_H
  19 #define _UNIWIDTH_H
  20
  21 #include "unitypes.h"
  22
  23 /* Get size_t.  */
  24 #include <stddef.h>
  25
  26 /* Get locale_charset() declaration.  */
  27 #include "localcharset.h"
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33
  34 /* Display width.  */
  35
  36 /* These functions are locale dependent.  The encoding argument identifies
  37    the encoding (e.g. "ISO-8859-2" for Polish).  */
  38
  39 /* Determine number of column positions required for UC.  */
  40 extern int
  41        uc_width (ucs4_t uc, const char *encoding)
  42        _UC_ATTRIBUTE_PURE;
  43
  44 /* Determine number of column positions required for first N units
  45    (or fewer if S ends before this) in S.  */
  46 extern int
  47        u8_width (const uint8_t *s, size_t n, const char *encoding)
  48        _UC_ATTRIBUTE_PURE;
  49 extern int
  50        u16_width (const uint16_t *s, size_t n, const char *encoding)
  51        _UC_ATTRIBUTE_PURE;
  52 extern int
  53        u32_width (const uint32_t *s, size_t n, const char *encoding)
  54        _UC_ATTRIBUTE_PURE;
  55
  56 /* Determine number of column positions required for S.  */
  57 extern int
  58        u8_strwidth (const uint8_t *s, const char *encoding)
  59        _UC_ATTRIBUTE_PURE;
  60 extern int
  61        u16_strwidth (const uint16_t *s, const char *encoding)
  62        _UC_ATTRIBUTE_PURE;
  63 extern int
  64        u32_strwidth (const uint32_t *s, const char *encoding)
  65        _UC_ATTRIBUTE_PURE;
  66
  67
  68 #ifdef __cplusplus
  69 }
  70 #endif
  71
  72 #endif /* _UNIWIDTH_H */