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Import Tcl 8.6.11

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This commit is contained in:
Steve Dower
2021-03-30 00:51:39 +01:00
parent 3bb8e3e086
commit 1aadb2455c
923 changed files with 79104 additions and 62616 deletions
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34
doc/Utf.3
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@@ -141,8 +141,8 @@ 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.
byte of \fIsrc\fR in \fI*chPtr\fR as a Tcl_UniChar between 0x0080 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.
@@ -223,13 +223,27 @@ 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.
\fBTcl_UtfPrev\fR is used to step backward through but not beyond the
UTF-8 string that begins at \fIstart\fR. If the UTF-8 string is made
up entirely of complete and well-formed characters, and \fIsrc\fR points
to the lead byte of one of those characters (or to the location one byte
past the end of the string), then repeated calls of \fBTcl_UtfPrev\fR will
return pointers to the lead bytes of each character in the string, one
character at a time, terminating when it returns \fIstart\fR.
.PP
When the conditions of completeness and well-formedness may not be satisfied,
a more precise description of the function of \fBTcl_UtfPrev\fR is necessary.
It always returns a pointer greater than or equal to \fIstart\fR; that is,
always a pointer to a location in the string. It always returns a pointer to
a byte that begins a character when scanning for characters beginning
from \fIstart\fR. When \fIsrc\fR is greater than \fIstart\fR, it
always returns a pointer less than \fIsrc\fR and greater than or
equal to (\fIsrc\fR - \fBTCL_UTF_MAX\fR). The character that begins
at the returned pointer is the first one that either includes the
byte \fIsrc[-1]\fR, or might include it if the right trail bytes are
present at \fIsrc\fR and greater. \fBTcl_UtfPrev\fR never reads the
byte \fIsrc[0]\fR nor the byte \fIstart[-1]\fR nor the byte
\fIsrc[-\fBTCL_UTF_MAX\fI-1]\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
@@ -240,7 +254,7 @@ characters. Behavior is undefined if a negative \fIindex\fR is given.
\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,
\fBTcl_UtfToUniChar\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