diff options
Diffstat (limited to 'tcl8.6/doc/Utf.3')
| -rw-r--r-- | tcl8.6/doc/Utf.3 | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/tcl8.6/doc/Utf.3 b/tcl8.6/doc/Utf.3 new file mode 100644 index 0000000..9d0c617 --- /dev/null +++ b/tcl8.6/doc/Utf.3 @@ -0,0 +1,259 @@ +'\" +'\" Copyright (c) 1997 Sun Microsystems, Inc. +'\" +'\" See the file "license.terms" for information on usage and redistribution +'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. +'\" +.TH Utf 3 "8.1" Tcl "Tcl Library Procedures" +.so man.macros +.BS +.SH NAME +Tcl_UniChar, Tcl_UniCharToUtf, Tcl_UtfToUniChar, Tcl_UniCharToUtfDString, Tcl_UtfToUniCharDString, Tcl_UniCharLen, Tcl_UniCharNcmp, Tcl_UniCharNcasecmp, Tcl_UniCharCaseMatch, Tcl_UtfNcmp, Tcl_UtfNcasecmp, Tcl_UtfCharComplete, Tcl_NumUtfChars, Tcl_UtfFindFirst, Tcl_UtfFindLast, Tcl_UtfNext, Tcl_UtfPrev, Tcl_UniCharAtIndex, Tcl_UtfAtIndex, Tcl_UtfBackslash \- routines for manipulating UTF-8 strings +.SH SYNOPSIS +.nf +\fB#include <tcl.h>\fR +.sp +typedef ... \fBTcl_UniChar\fR; +.sp +int +\fBTcl_UniCharToUtf\fR(\fIch, buf\fR) +.sp +int +\fBTcl_UtfToUniChar\fR(\fIsrc, chPtr\fR) +.sp +char * +\fBTcl_UniCharToUtfDString\fR(\fIuniStr, uniLength, dsPtr\fR) +.sp +Tcl_UniChar * +\fBTcl_UtfToUniCharDString\fR(\fIsrc, length, dsPtr\fR) +.sp +int +\fBTcl_UniCharLen\fR(\fIuniStr\fR) +.sp +int +\fBTcl_UniCharNcmp\fR(\fIucs, uct, numChars\fR) +.sp +int +\fBTcl_UniCharNcasecmp\fR(\fIucs, uct, numChars\fR) +.sp +int +\fBTcl_UniCharCaseMatch\fR(\fIuniStr, uniPattern, nocase\fR) +.sp +int +\fBTcl_UtfNcmp\fR(\fIcs, ct, numChars\fR) +.sp +int +\fBTcl_UtfNcasecmp\fR(\fIcs, ct, numChars\fR) +.sp +int +\fBTcl_UtfCharComplete\fR(\fIsrc, length\fR) +.sp +int +\fBTcl_NumUtfChars\fR(\fIsrc, length\fR) +.sp +const char * +\fBTcl_UtfFindFirst\fR(\fIsrc, ch\fR) +.sp +const char * +\fBTcl_UtfFindLast\fR(\fIsrc, ch\fR) +.sp +const char * +\fBTcl_UtfNext\fR(\fIsrc\fR) +.sp +const char * +\fBTcl_UtfPrev\fR(\fIsrc, start\fR) +.sp +Tcl_UniChar +\fBTcl_UniCharAtIndex\fR(\fIsrc, index\fR) +.sp +const char * +\fBTcl_UtfAtIndex\fR(\fIsrc, index\fR) +.sp +int +\fBTcl_UtfBackslash\fR(\fIsrc, readPtr, dst\fR) +.SH ARGUMENTS +.AS "const Tcl_UniChar" *uniPattern in/out +.AP char *buf out +Buffer in which the UTF-8 representation of the Tcl_UniChar is stored. At most +\fBTCL_UTF_MAX\fR bytes are stored in the buffer. +.AP int ch in +The Unicode character to be converted or examined. +.AP Tcl_UniChar *chPtr out +Filled with the Tcl_UniChar represented by the head of the UTF-8 string. +.AP "const char" *src in +Pointer to a UTF-8 string. +.AP "const char" *cs in +Pointer to a UTF-8 string. +.AP "const char" *ct in +Pointer to a UTF-8 string. +.AP "const Tcl_UniChar" *uniStr in +A null-terminated Unicode string. +.AP "const Tcl_UniChar" *ucs in +A null-terminated Unicode string. +.AP "const Tcl_UniChar" *uct in +A null-terminated Unicode string. +.AP "const Tcl_UniChar" *uniPattern in +A null-terminated Unicode string. +.AP int length in +The length of the UTF-8 string in bytes (not UTF-8 characters). If +negative, all bytes up to the first null byte are used. +.AP int uniLength in +The length of the Unicode string in characters. Must be greater than or +equal to 0. +.AP "Tcl_DString" *dsPtr in/out +A pointer to a previously initialized \fBTcl_DString\fR. +.AP "unsigned long" numChars in +The number of characters to compare. +.AP "const char" *start in +Pointer to the beginning of a UTF-8 string. +.AP int index in +The index of a character (not byte) in the UTF-8 string. +.AP int *readPtr out +If non-NULL, filled with the number of bytes in the backslash sequence, +including the backslash character. +.AP char *dst out +Buffer in which the bytes represented by the backslash sequence are stored. +At most \fBTCL_UTF_MAX\fR bytes are stored in the buffer. +.AP int nocase in +Specifies whether the match should be done case-sensitive (0) or +case-insensitive (1). +.BE + +.SH DESCRIPTION +.PP +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 \fBTCL_UTF_MAX\fR bytes. A multibyte UTF-8 +sequence consists of a lead byte followed by some number of trail bytes. +.PP +\fBTCL_UTF_MAX\fR is the maximum number of bytes that it takes to +represent one Unicode character in the UTF-8 representation. +.PP +\fBTcl_UniCharToUtf\fR stores the Tcl_UniChar \fIch\fR as a UTF-8 string +in starting at \fIbuf\fR. The return value is the number of bytes stored +in \fIbuf\fR. +.PP +\fBTcl_UtfToUniChar\fR reads one UTF-8 character starting at \fIsrc\fR +and stores it as a Tcl_UniChar in \fI*chPtr\fR. The return value is the +number of bytes read from \fIsrc\fR. 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, \fBTcl_UtfToUniChar\fR will store the first +byte of \fIsrc\fR in \fI*chPtr\fR as a Tcl_UniChar between 0x0000 and +0x00ff and return 1. +.PP +\fBTcl_UniCharToUtfDString\fR converts the given Unicode string +to UTF-8, storing the result in a previously initialized \fBTcl_DString\fR. +You must specify \fIuniLength\fR, 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 \fBTcl_DString\fR. +.PP +\fBTcl_UtfToUniCharDString\fR converts the given UTF-8 string to Unicode, +storing the result in the previously initialized \fBTcl_DString\fR. +In the argument \fIlength\fR, you may either specify the length of +the given UTF-8 string in bytes or +.QW \-1 , +in which case \fBTcl_UtfToUniCharDString\fR uses \fBstrlen\fR 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 \fBTcl_DString\fR. The Unicode string +is terminated with a Unicode null character. +.PP +\fBTcl_UniCharLen\fR corresponds to \fBstrlen\fR for Unicode +characters. It accepts a null-terminated Unicode string and returns +the number of Unicode characters (not bytes) in that string. +.PP +\fBTcl_UniCharNcmp\fR and \fBTcl_UniCharNcasecmp\fR correspond to +\fBstrncmp\fR and \fBstrncasecmp\fR, respectively, for Unicode characters. +They accept two null-terminated Unicode strings and the number of characters +to compare. Both strings are assumed to be at least \fInumChars\fR characters +long. \fBTcl_UniCharNcmp\fR 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. \fBTcl_UniCharNcasecmp\fR +is the Unicode case insensitive version. +.PP +\fBTcl_UniCharCaseMatch\fR is the Unicode equivalent to +\fBTcl_StringCaseMatch\fR. 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. +.PP +\fBTcl_UtfNcmp\fR corresponds to \fBstrncmp\fR 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 \fInumChars\fR +characters long.) \fBTcl_UtfNcmp\fR 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. +.PP +\fBTcl_UtfNcasecmp\fR corresponds to \fBstrncasecmp\fR for UTF-8 +strings. It is similar to \fBTcl_UtfNcmp\fR except comparisons ignore +differences in case when comparing upper, lower or title case +characters. +.PP +\fBTcl_UtfCharComplete\fR returns 1 if the source UTF-8 string \fIsrc\fR +of \fIlength\fR bytes is long enough to be decoded by +\fBTcl_UtfToUniChar\fR, or 0 otherwise. This function does not guarantee +that the UTF-8 string is properly 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. +.PP +\fBTcl_NumUtfChars\fR corresponds to \fBstrlen\fR for UTF-8 strings. It +returns the number of Tcl_UniChars that are represented by the UTF-8 string +\fIsrc\fR. The length of the source string is \fIlength\fR bytes. If the +length is negative, all bytes up to the first null byte are used. +.PP +\fBTcl_UtfFindFirst\fR corresponds to \fBstrchr\fR for UTF-8 strings. It +returns a pointer to the first occurrence of the Tcl_UniChar \fIch\fR +in the null-terminated UTF-8 string \fIsrc\fR. The null terminator is +considered part of the UTF-8 string. +.PP +\fBTcl_UtfFindLast\fR corresponds to \fBstrrchr\fR for UTF-8 strings. It +returns a pointer to the last occurrence of the Tcl_UniChar \fIch\fR +in the null-terminated UTF-8 string \fIsrc\fR. The null terminator is +considered part of the UTF-8 string. +.PP +Given \fIsrc\fR, a pointer to some location in a UTF-8 string, +\fBTcl_UtfNext\fR 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. +.PP +Given \fIsrc\fR, a pointer to some location in a UTF-8 string (or to a +null byte immediately following such a string), \fBTcl_UtfPrev\fR +returns a pointer to the closest preceding byte that starts a UTF-8 +character. +This function will not back up to a position before \fIstart\fR, +the start of the UTF-8 string. If \fIsrc\fR was already at \fIstart\fR, the +return value will be \fIstart\fR. +.PP +\fBTcl_UniCharAtIndex\fR corresponds to a C string array dereference or the +Pascal Ord() function. It returns the Tcl_UniChar represented at the +specified character (not byte) \fIindex\fR in the UTF-8 string +\fIsrc\fR. The source string must contain at least \fIindex\fR +characters. Behavior is undefined if a negative \fIindex\fR is given. +.PP +\fBTcl_UtfAtIndex\fR returns a pointer to the specified character (not +byte) \fIindex\fR in the UTF-8 string \fIsrc\fR. The source string must +contain at least \fIindex\fR characters. This is equivalent to calling +\fBTcl_UtfNext\fR \fIindex\fR times. If a negative \fIindex\fR is given, +the return pointer points to the first character in the source string. +.PP +\fBTcl_UtfBackslash\fR is a utility procedure used by several of the Tcl +commands. It parses a backslash sequence and stores the properly formed +UTF-8 character represented by the backslash sequence in the output +buffer \fIdst\fR. At most \fBTCL_UTF_MAX\fR bytes are stored in the buffer. +\fBTcl_UtfBackslash\fR modifies \fI*readPtr\fR 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. +.PP +See the \fBTcl\fR manual entry for information on the valid backslash +sequences. All of the sequences described in the Tcl manual entry are +supported by \fBTcl_UtfBackslash\fR. + +.SH KEYWORDS +utf, unicode, backslash |