third_party/re2/util/utf.h

   1 /*
   2  * The authors of this software are Rob Pike and Ken Thompson.
   3  *              Copyright (c) 2002 by Lucent Technologies.
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose without fee is hereby granted, provided that this entire notice
   6  * is included in all copies of any software which is or includes a copy
   7  * or modification of this software and in all copies of the supporting
   8  * documentation for such software.
   9  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
  10  * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
  11  * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
  12  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
  13  *
  14  * This file and rune.cc have been converted to compile as C++ code
  15  * in name space re2.
  16  */
  17 #ifndef RE2_UTIL_UTF_H__
  18 #define RE2_UTIL_UTF_H__
  19
  20 #include <stdint.h>
  21
  22 namespace re2 {
  23
  24 typedef signed int Rune;        /* Code-point values in Unicode 4.0 are 21 bits wide.*/
  25
  26 enum
  27 {
  28   UTFmax        = 4,            /* maximum bytes per rune */
  29   Runesync      = 0x80,         /* cannot represent part of a UTF sequence (<) */
  30   Runeself      = 0x80,         /* rune and UTF sequences are the same (<) */
  31   Runeerror     = 0xFFFD,       /* decoding error in UTF */
  32   Runemax       = 0x10FFFF,     /* maximum rune value */
  33 };
  34
  35 int runetochar(char* s, const Rune* r);
  36 int chartorune(Rune* r, const char* s);
  37 int fullrune(const char* s, int n);
  38 int utflen(const char* s);
  39 char* utfrune(const char*, Rune);
  40
  41 }  // namespace re2
  42
  43 #endif  // RE2_UTIL_UTF_H__