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Overview
Comment:Removed TCL_LINK_ALLOC; it wasn't used.
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Timelines: family | ancestors | descendants | both | tip-312-new
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SHA3-256: 8260b9fa287efd82f378c38eac6da6603a5a1368fee70d8e4db2d20f5bcf4178
User & Date: dkf 2019-04-14 07:52:16
Context
2019-04-14
14:17
Implement TIP 312 check-in: 8dfa9e699b user: dkf tags: core-8-branch
07:52
Removed TCL_LINK_ALLOC; it wasn't used. Closed-Leaf check-in: 8260b9fa28 user: dkf tags: tip-312-new
2019-04-12
19:21
merge 8.7 check-in: 77b29afa6b user: dgp tags: tip-312-new
Changes
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Changes to doc/LinkVar.3. 

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.AP Tcl_Interp *interp in
Interpreter that contains \fIvarName\fR.
Also used by \fBTcl_LinkVar\fR to return error messages.
.AP "const char" *varName in
Name of global variable.
.AP void *addr in
Address of C variable that is to be linked to \fIvarName\fR.





.AP int type in
Type of C variable for \fBTcl_LinkVar\fR or type of array element for
\fBTcl_LinkArray\fR.  Must be one of \fBTCL_LINK_INT\fR,
\fBTCL_LINK_UINT\fR, \fBTCL_LINK_CHAR\fR, \fBTCL_LINK_UCHAR\fR,
\fBTCL_LINK_SHORT\fR, \fBTCL_LINK_USHORT\fR, \fBTCL_LINK_LONG\fR,
\fBTCL_LINK_ULONG\fR, \fBTCL_LINK_WIDE_INT\fR,
\fBTCL_LINK_WIDE_UINT\fR, \fBTCL_LINK_FLOAT\fR, \fBTCL_LINK_DOUBLE\fR,
................................................................................
\fBTCL_LINK_BOOLEAN\fR, or one of the extra ones listed below.
.sp
In \fBTcl_LinkVar\fR, the additional linked type \fBTCL_LINK_STRING\fR may be
used.
.sp
.VS "TIP 312"
In \fBTcl_LinkArray\fR, the additional linked types \fBTCL_LINK_CHARS\fR and
\fBTCL_LINK_BYTES\fR may be used.  \fBTCL_LINK_ALLOC\fR may also be OR'ed in
to tell Tcl to manage the storage for the array in the variable (that is, the
C variable is technically a pointer to an array, not the array itself).
.VE "TIP 312"
.sp
All the above for both functions may be
optionally OR'ed with \fBTCL_LINK_READ_ONLY\fR to make the Tcl
variable read-only.
.AP int size in
.VS "TIP 312"
................................................................................
while setting up the link (e.g. because \fIvarName\fR is the
name of array) then \fBTCL_ERROR\fR is returned and the interpreter's result
contains an error message.
.PP
.VS "TIP 312"
\fBTcl_LinkArray\fR is similar, but for arrays of fixed size (given by
the \fIsize\fR argument). When asked to allocate the backing C array
storage (via the \fBTCL_LINK_ALLOC\fR bit), it writes the address that
it allocated to the Tcl interpreter result in addition to storing the
location of the array in the C variable pointed to by \fIaddr\fR.
.VE "TIP 312"
.PP
The \fItype\fR argument specifies the type of the C variable,
or the type of the elements of the C array,
and must have one of the following values, optionally OR'ed with
\fBTCL_LINK_READ_ONLY\fR:
.TP







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.AP Tcl_Interp *interp in
Interpreter that contains \fIvarName\fR.
Also used by \fBTcl_LinkVar\fR to return error messages.
.AP "const char" *varName in
Name of global variable.
.AP void *addr in
Address of C variable that is to be linked to \fIvarName\fR.
.sp
.VS "TIP 312"
In \fBTcl_LinkArray\fR, may be NULL to tell Tcl to create the storage
for the array in the variable.
.VE "TIP 312"
.AP int type in
Type of C variable for \fBTcl_LinkVar\fR or type of array element for
\fBTcl_LinkArray\fR.  Must be one of \fBTCL_LINK_INT\fR,
\fBTCL_LINK_UINT\fR, \fBTCL_LINK_CHAR\fR, \fBTCL_LINK_UCHAR\fR,
\fBTCL_LINK_SHORT\fR, \fBTCL_LINK_USHORT\fR, \fBTCL_LINK_LONG\fR,
\fBTCL_LINK_ULONG\fR, \fBTCL_LINK_WIDE_INT\fR,
\fBTCL_LINK_WIDE_UINT\fR, \fBTCL_LINK_FLOAT\fR, \fBTCL_LINK_DOUBLE\fR,
................................................................................
\fBTCL_LINK_BOOLEAN\fR, or one of the extra ones listed below.
.sp
In \fBTcl_LinkVar\fR, the additional linked type \fBTCL_LINK_STRING\fR may be
used.
.sp
.VS "TIP 312"
In \fBTcl_LinkArray\fR, the additional linked types \fBTCL_LINK_CHARS\fR and
\fBTCL_LINK_BYTES\fR may be used.


.VE "TIP 312"
.sp
All the above for both functions may be
optionally OR'ed with \fBTCL_LINK_READ_ONLY\fR to make the Tcl
variable read-only.
.AP int size in
.VS "TIP 312"
................................................................................
while setting up the link (e.g. because \fIvarName\fR is the
name of array) then \fBTCL_ERROR\fR is returned and the interpreter's result
contains an error message.
.PP
.VS "TIP 312"
\fBTcl_LinkArray\fR is similar, but for arrays of fixed size (given by
the \fIsize\fR argument). When asked to allocate the backing C array
storage (via the \fIaddr\fR argument being NULL), it writes the
address that it allocated to the Tcl interpreter result.

.VE "TIP 312"
.PP
The \fItype\fR argument specifies the type of the C variable,
or the type of the elements of the C array,
and must have one of the following values, optionally OR'ed with
\fBTCL_LINK_READ_ONLY\fR:
.TP

Changes to generic/tclLink.c. 

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    Tcl_Interp *interp,		/* Interpreter in which varName exists. */
    const char *varName,	/* Name of a global variable in interp. */
    void *addr,			/* Address of a C variable to be linked to
				 * varName. If NULL then the necessary space
				 * will be allocated and returned as the
				 * interpreter result. */
    int type,			/* Type of C variable: TCL_LINK_INT, etc. Also
				 * may have TCL_LINK_READ_ONLY and
				 * TCL_LINK_ALLOC OR'ed in. */
    int size)			/* Size of C variable array, >1 if array */
{
    Tcl_Obj *objPtr;
    Link *linkPtr;
    int code;

    if (size < 1) {







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    Tcl_Interp *interp,		/* Interpreter in which varName exists. */
    const char *varName,	/* Name of a global variable in interp. */
    void *addr,			/* Address of a C variable to be linked to
				 * varName. If NULL then the necessary space
				 * will be allocated and returned as the
				 * interpreter result. */
    int type,			/* Type of C variable: TCL_LINK_INT, etc. Also
				 * may have TCL_LINK_READ_ONLY OR'ed in. */

    int size)			/* Size of C variable array, >1 if array */
{
    Tcl_Obj *objPtr;
    Link *linkPtr;
    int code;

    if (size < 1) {

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