Tcl_UtfPrev man page on UnixWare

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Utf(3)			    Tcl Library Procedures			Utf(3)

______________________________________________________________________________

NAME
       Tcl_UniChar,   Tcl_UniCharToUtf,	 Tcl_UtfToUniChar,  Tcl_UniCharToUtfD‐
       String,	 Tcl_UtfToUniCharDString,   Tcl_UniCharLen,   Tcl_UniCharNcmp,
       Tcl_UtfCharComplete,  Tcl_NumUtfChars,  Tcl_UtfFindFirst,  Tcl_UtfFind‐
       Last,  Tcl_UtfNext,  Tcl_UtfPrev,  Tcl_UniCharAtIndex,  Tcl_UtfAtIndex,
       Tcl_UtfBackslash - 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_UtfNcmp(src, src, num)

       int
       Tcl_UtfNcasecmp(src, src, num)

       int
       Tcl_UtfCharComplete(src, len)

       int
       Tcl_NumUtfChars(src, len)

       char *
       Tcl_UtfFindFirst(src, ch)

       char *
       Tcl_UtfFindLast(src, ch)

       char *
       Tcl_UtfNext(src)

       char *
       Tcl_UtfPrev(src, start)

       Tcl_UniChar
       Tcl_UniCharAtIndex(src, index)

       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.

       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.
_________________________________________________________________

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 coverts 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	corresponds  to	 strncmp  for  Unicode characters.  It
       accepts two NULL-terminated Unicode strings and the number  of  charac‐
       ters  to compare.  (Both strings are assumed to be at least len charac‐
       ters 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_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 occurance 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.

       Tcl_UtfFindLast corresponds to strrchr for UTF-8 strings.  It returns a
       pointer to the last occurance 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 call‐
       er must not ask for the next character after the last character in  the
       string.

       Given  src,  a  pointer to some location in a UTF-8 string, Tcl_UtfPrev
       returns a pointer to the previous UTF-8 character in the string.	  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.

       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.

       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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