Check-in [282fd21df6]

{"tip": {

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{"tip": {
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................................................................................
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<th>Type</th>
<th>Tcl Version</th>
<th>Status</th>
<th>Title</th>
<th>Impl.</th>
</tr></thead><tbody>









<tr class='project projectdraft projectdraft86 project86'>
<td valign='top'><a href='./tip/536.md'>536</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.6</td>
<td valign='top'>Draft</td>
<td valign='top'># TIP 536: Improvements to Mac-specific IPC in Tk</td>
<td valign='top'><a href='/tk/timeline?r=mac_services'>Link</a></td>

<th>Type</th>
<th>Tcl Version</th>
<th>Status</th>
<th>Title</th>
<th>Impl.</th>
</tr></thead><tbody>

<tr class='project projectdraft projectdraft90 project90'>
<td valign='top'><a href='./tip/537.md'>537</a></td>
<td valign='top'>Project</td>
<td valign='top'>9.0</td>
<td valign='top'>Draft</td>
<td valign='top'># TIP 537: Enable 64-bit indexes in regexp matching</td>
<td valign='top'><a href='/tcl/timeline?r=regexp-api-64bit'>Link</a></td>
</tr>
<tr class='project projectdraft projectdraft86 project86'>
<td valign='top'><a href='./tip/536.md'>536</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.6</td>
<td valign='top'>Draft</td>
<td valign='top'># TIP 536: Improvements to Mac-specific IPC in Tk</td>
<td valign='top'><a href='/tk/timeline?r=mac_services'>Link</a></td>

# TIP 537: Enable 64-bit indexes in regexp matching
	Author:         Jan Nijtmans <[email protected]>
	State:          Draft
	Type:           Project
	Vote:           
	Created:        7-April-2019
	Post-History:   
	Keywords:       Tcl
	Tcl-Version:    9.0
	Tcl-Branch:     regexp-api-64bit
-----

# Abstract
 
This TIP proposes to modify "struct Tcl\_RegExpInfo" and "struct Tcl\_RegExpIndices, such that the fields indicating indexes change from type "int" to type "size\_t"

# Rationale

This TIP should have been part of TIP #502 (Index Value Reform) and/or TIP #494 (More use of size_t in Tcl 9), but it was overlooked. Without changing this public API, regulare expresion
indexes never can exceed 2G in value.

# Specification and Documentation

Here are the new struct definitions:
<pre>
typedef struct Tcl\_RegExpInfo {
    size\_t nsubs;
    Tcl_RegExpIndices *matches;
    size\_t extendStart;
} Tcl\_RegExpInfo;

typedef struct Tcl\_RegExpIndices {
    size\_t start;
    size\_t end;
} Tcl\_RegExpIndices;
</pre>

Also a new macro TCL\_INDEX\_NONE will be provided, which is the value of the "start"/"end" fields when there is no match.
This macro will be provided to 8.7 as well, but in Tcl 8.7 it will have the value (-1).

# Implementation

An implementation of this TIP is present in the [regexp-api-64bit](https://core.tcl-lang.org/tcl/timeline?r=regexp-api-64bit) branch. 


# Copyright

This document has been placed in the public domain.