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Utf(3)			    Tcl Library Procedures			Utf(3)

______________________________________________________________________________

NAME
       Tcl_UniChar,	    Tcl_UniCharCaseMatch,	  Tcl_UniCharNcasecmp,
       Tcl_UniCharToUtf,      Tcl_UtfToUniChar,	      Tcl_UniCharToUtfDString,
       Tcl_UtfToUniCharDString,	 Tcl_UniCharLen, Tcl_UniCharNcmp, Tcl_UtfChar-
       Complete,    Tcl_NumUtfChars,	Tcl_UtfFindFirst,     Tcl_UtfFindLast,
       Tcl_UtfNext,  Tcl_UtfPrev, Tcl_UniCharAtIndex, Tcl_UtfAtIndex, Tcl_Utf-
       Backslash - routines for manipulating UTF-8 strings.

SYNOPSIS
       #include <tcl.h>

       typedef ... Tcl_UniChar;

       int
       Tcl_UniCharToUtf(ch, buf)

       int
       Tcl_UtfToUniChar(src, chPtr)

       char *								       |
       Tcl_UniCharToUtfDString(uniStr, numChars, dstPtr)		       |

       Tcl_UniChar *							       |
       Tcl_UtfToUniCharDString(src, len, dstPtr)			       |

       int
       Tcl_UniCharLen(uniStr)

       int
       Tcl_UniCharNcmp(uniStr, uniStr, num)

       int								       |
       Tcl_UniCharNcasecmp(uniStr, uniStr, num)				       |

       int								       |
       Tcl_UniCharCaseMatch(uniStr, uniPattern, nocase)			       |

       int
       Tcl_UtfNcmp(src, src, num)

       int
       Tcl_UtfNcasecmp(src, src, num)

       int
       Tcl_UtfCharComplete(src, len)

       int
       Tcl_NumUtfChars(src, len)

       CONST char *							       |
       Tcl_UtfFindFirst(src, ch)					       |

       CONST char *							       |
       Tcl_UtfFindLast(src, ch)						       |

       CONST char *							       |
       Tcl_UtfNext(src)							       |

       CONST char *							       |
       Tcl_UtfPrev(src, start)						       |

       Tcl_UniChar
       Tcl_UniCharAtIndex(src, index)

       CONST char *							       |
       Tcl_UtfAtIndex(src, index)					       |

       int
       Tcl_UtfBackslash(src, readPtr, dst)

ARGUMENTS
       char		   *buf	      (out)	Buffer in which the UTF-8 rep-
						resentation of the Tcl_UniChar
						is    stored.	   At	  most
						TCL_UTF_MAX  bytes  are stored
						in the buffer.

       int		   ch	      (in)	The  Tcl_UniChar  to  be  con-
						verted or examined.

       Tcl_UniChar	   *chPtr     (out)	Filled	with  the  Tcl_UniChar
						represented by the head of the
						UTF-8 string.

       CONST char	   *src	      (in)	Pointer to a UTF-8 string.

       CONST Tcl_UniChar   *uniStr    (in)	A    null-terminated   Unicode
						string.

       CONST Tcl_UniChar   *uniPattern(in)	A   null-terminated    Unicode
						string.

       int		   len	      (in)	The length of the UTF-8 string
						in bytes  (not	UTF-8  charac-
						ters).	If negative, all bytes
						up to the first null byte  are
						used.

       int		   numChars   (in)	The   length  of  the  Unicode
						string in characters.  Must be
						greater than or equal to 0.

       Tcl_DString	   *dstPtr    (in/out)	A pointer to a previously-ini-
						tialized Tcl_DString.

       unsigned long	   num	      (in)	The number  of	characters  to
						compare.

       CONST char	   *start     (in)	Pointer	 to the beginning of a
						UTF-8 string.

       int		   index      (in)	The index of a character  (not
						byte) in the UTF-8 string.

       int		   *readPtr   (out)	If  non-NULL,  filled with the
						number of bytes in  the	 back-
						slash  sequence, including the
						backslash character.

       char		   *dst	      (out)	Buffer in which the bytes rep-
						resented   by	the  backslash
						sequence are stored.  At  most
						TCL_UTF_MAX  bytes  are stored
						in the buffer.		       |

       int		   nocase     (in)				       ||
						Specifies  whether  the	 match |
						should be done	case-sensitive |
						(0) or case-insensitive (1).
_________________________________________________________________

DESCRIPTION
       These  routines	convert	 between  UTF-8	 strings  and Tcl_UniChars.  A
       Tcl_UniChar is a Unicode character represented as an  unsigned,	fixed-
       size quantity.  A UTF-8 character is a Unicode character represented as
       a varying-length sequence of up	to  TCL_UTF_MAX	 bytes.	  A  multibyte
       UTF-8 sequence consists of a lead byte followed by some number of trail
       bytes.

       TCL_UTF_MAX is the maximum number of bytes that it takes	 to  represent
       one Unicode character in the UTF-8 representation.

       Tcl_UniCharToUtf	 stores the Tcl_UniChar ch as a UTF-8 string in start-
       ing at buf.  The return value is the number of bytes stored in buf.

       Tcl_UtfToUniChar reads one UTF-8 character starting at src  and	stores
       it as a Tcl_UniChar in *chPtr.  The return value is the number of bytes
       read from src..	The caller must ensure that the source buffer is  long
       enough  such that this routine does not run off the end and dereference
       non-existent or random memory; if the source  buffer  is	 known	to  be
       null-terminated,	 this  will not happen.	 If the input is not in proper
       UTF-8 format, Tcl_UtfToUniChar will store the  first  byte  of  src  in
       *chPtr as a Tcl_UniChar between 0x0000 and 0x00ff and return 1.

       Tcl_UniCharToUtfDString	converts  the  given  Unicode string to UTF-8,
       storing the result in a previously-initialized Tcl_DString.   You  must
       specify	the length of the given Unicode string.	 The return value is a
       pointer to the UTF-8 representation of the Unicode string.  Storage for
       the return value is appended to the end of the Tcl_DString.

       Tcl_UtfToUniCharDString	converts  the  given  UTF-8 string to Unicode,
       storing the result in the previously-initialized Tcl_DString.  you  may
       either  specify	the length of the given UTF-8 string or "-1", in which
       case Tcl_UtfToUniCharDString uses strlen to calculate the length.   The
       return  value  is  a pointer to the Unicode representation of the UTF-8
       string.	Storage for the return value is appended to  the  end  of  the
       Tcl_DString.   The  Unicode  string  is	terminated with a Unicode null
       character.

       Tcl_UniCharLen  corresponds  to	strlen	for  Unicode  characters.   It
       accepts a null-terminated Unicode string and returns the number of Uni-
       code characters (not bytes) in that string.

       Tcl_UniCharNcmp and Tcl_UniCharNcasecmp correspond to strncmp and strn-
       casecmp,	 respectively, for Unicode characters.	They accepts two null-
       terminated Unicode strings and the number  of  characters  to  compare.
       Both   strings  are  assumed  to	 be  at	 least	len  characters	 long.
       Tcl_UniCharNcmp	 compares  the	two   strings	character-by-character
       according  to  the  Unicode  character ordering.	 It returns an integer
       greater than, equal to, or less than 0 if the first string  is  greater
       than,   equal   to,  or	less  than  the	 second	 string	 respectively.
       Tcl_UniCharNcasecmp is the Unicode case insensitive version.

       Tcl_UniCharCaseMatch is the Unicode equivalent to  Tcl_StringCaseMatch. |
       It  accepts  a null-terminated Unicode string, a Unicode pattern, and a |
       boolean value specifying whether the match should be case sensitive and |
       returns whether the string matches the pattern.

       Tcl_UtfNcmp  corresponds	 to  strncmp for UTF-8 strings. It accepts two
       null-terminated UTF-8 strings and the number of characters to  compare.
       (Both  strings  are  assumed  to	 be  at	 least	len  characters long.)
       Tcl_UtfNcmp compares the two strings  character-by-character  according
       to the Unicode character ordering.  It returns an integer greater than,
       equal to, or less than 0 if the first string is greater than, equal to,
       or less than the second string respectively.

       Tcl_UtfNcasecmp	corresponds  to	 strncasecmp for UTF-8 strings.	 It is
       similar to Tcl_UtfNcmp except comparisons ignore	 differences  in  case
       when comparing upper, lower or title case characters.

       Tcl_UtfCharComplete  returns 1 if the source UTF-8 string src of length
       len bytes is long enough to be decoded by Tcl_UtfToUniChar, or 0 other-
       wise.   This function does not guarantee that the UTF-8 string is prop-
       erly formed.  This routine is used by procedures that are operating  on
       a  byte at a time and need to know if a full Tcl_UniChar has been seen.

       Tcl_NumUtfChars corresponds to strlen for UTF-8	strings.   It  returns
       the  number  of	Tcl_UniChars  that are represented by the UTF-8 string
       src.  The length of the source string is len bytes.  If the  length  is
       negative, all bytes up to the first null byte are used.

       Tcl_UtfFindFirst corresponds to strchr for UTF-8 strings.  It returns a
       pointer to the first occurrence of the Tcl_UniChar ch in the  null-ter-
       minated	UTF-8  string  src.  The null terminator is considered part of
       the UTF-8 string.

       Tcl_UtfFindLast corresponds to strrchr for UTF-8 strings.  It returns a
       pointer to the last occurrence of the Tcl_UniChar ch in the null-termi-
       nated UTF-8 string src.	The null terminator is considered part of  the
       UTF-8 string.

       Given  src,  a  pointer to some location in a UTF-8 string, Tcl_UtfNext
       returns a pointer to the next  UTF-8  character	in  the	 string.   The
       caller  must not ask for the next character after the last character in
       the string if the string is not terminated by a null character.

       Given src, a pointer to some location in a UTF-8 string (or to  a  null
       byte  immediately  following  such  a  string),	Tcl_UtfPrev  returns a
       pointer to the closest preceding byte that starts  a  UTF-8  character.
       This function will not back up to a position before start, the start of
       the UTF-8 string.  If src was already at start, the return  value  will
       be start.

       Tcl_UniCharAtIndex  corresponds	to a C string array dereference or the
       Pascal Ord() function.  It returns the Tcl_UniChar represented  at  the
       specified  character  (not  byte)  index	 in the UTF-8 string src.  The
       source string must contain at  least  index  characters.	  Behavior  is
       undefined if a negative index is given.

       Tcl_UtfAtIndex  returns a pointer to the specified character (not byte)
       index in the UTF-8 string src.  The source string must contain at least
       index  characters.   This  is  equivalent  to calling Tcl_UtfNext index
       times.  If a negative index is given, the return pointer points to  the
       first character in the source string.

       Tcl_UtfBackslash is a utility procedure used by several of the Tcl com-
       mands.  It parses a backslash sequence and stores the  properly	formed
       UTF-8  character	 represented  by  the backslash sequence in the output
       buffer dst.  At most  TCL_UTF_MAX  bytes	 are  stored  in  the  buffer.
       Tcl_UtfBackslash	 modifies  *readPtr  to contain the number of bytes in
       the backslash sequence, including the backslash character.  The	return
       value is the number of bytes stored in the output buffer.

       See  the	 Tcl  manual  entry  for  information  on  the valid backslash
       sequences.  All of the sequences described in the Tcl manual entry  are
       supported by Tcl_UtfBackslash.

KEYWORDS
       utf, unicode, backslash

Tcl				      8.1				Utf(3)
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