| 1 | /*
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| 2 | * tclStringObj.c --
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| 3 | *
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| 4 | * This file contains procedures that implement string operations
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| 5 | * on Tcl objects. To do this efficiently (i.e. to allow many
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| 6 | * appends to be done to an object without constantly reallocating
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| 7 | * the space for the string representation) we overallocate the
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| 8 | * space for the string and use the internal representation to keep
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| 9 | * track of the extra space. Objects with this internal
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| 10 | * representation are called "expandable string objects".
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| 11 | *
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| 12 | * Copyright (c) 1995-1997 Sun Microsystems, Inc.
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| 13 | *
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| 14 | * See the file "license.terms" for information on usage and redistribution
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| 15 | * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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| 16 | *
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| 17 | * RCS: @(#) $Id: tclStringObj.c,v 1.1 2008-06-04 13:58:10 demin Exp $
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| 18 | */
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| 19 |
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| 20 | #include "tclInt.h"
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| 21 |
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| 22 | /*
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| 23 | * Prototypes for procedures defined later in this file:
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| 24 | */
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| 25 |
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| 26 | static void ConvertToStringType _ANSI_ARGS_((Tcl_Obj *objPtr));
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| 27 | static void DupStringInternalRep _ANSI_ARGS_((Tcl_Obj *objPtr,
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| 28 | Tcl_Obj *copyPtr));
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| 29 | static int SetStringFromAny _ANSI_ARGS_((Tcl_Interp *interp,
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| 30 | Tcl_Obj *objPtr));
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| 31 | static void UpdateStringOfString _ANSI_ARGS_((Tcl_Obj *objPtr));
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| 32 |
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| 33 | /*
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| 34 | * The structure below defines the string Tcl object type by means of
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| 35 | * procedures that can be invoked by generic object code.
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| 36 | */
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| 37 |
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| 38 | Tcl_ObjType tclStringType = {
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| 39 | "string", /* name */
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| 40 | (Tcl_FreeInternalRepProc *) NULL, /* freeIntRepProc */
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| 41 | DupStringInternalRep, /* dupIntRepProc */
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| 42 | UpdateStringOfString, /* updateStringProc */
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| 43 | SetStringFromAny /* setFromAnyProc */
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| 44 | };
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| 45 | |
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| 46 |
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| 47 | /*
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| 48 | *----------------------------------------------------------------------
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| 49 | *
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| 50 | * Tcl_NewStringObj --
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| 51 | *
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| 52 | * This procedure is normally called when not debugging: i.e., when
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| 53 | * TCL_MEM_DEBUG is not defined. It creates a new string object and
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| 54 | * initializes it from the byte pointer and length arguments.
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| 55 | *
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| 56 | * When TCL_MEM_DEBUG is defined, this procedure just returns the
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| 57 | * result of calling the debugging version Tcl_DbNewStringObj.
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| 58 | *
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| 59 | * Results:
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| 60 | * A newly created string object is returned that has ref count zero.
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| 61 | *
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| 62 | * Side effects:
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| 63 | * The new object's internal string representation will be set to a
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| 64 | * copy of the length bytes starting at "bytes". If "length" is
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| 65 | * negative, use bytes up to the first NULL byte; i.e., assume "bytes"
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| 66 | * points to a C-style NULL-terminated string. The object's type is set
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| 67 | * to NULL. An extra NULL is added to the end of the new object's byte
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| 68 | * array.
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| 69 | *
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| 70 | *----------------------------------------------------------------------
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| 71 | */
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| 72 |
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| 73 | #ifdef TCL_MEM_DEBUG
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| 74 | #undef Tcl_NewStringObj
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| 75 |
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| 76 | Tcl_Obj *
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| 77 | Tcl_NewStringObj(bytes, length)
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| 78 | register char *bytes; /* Points to the first of the length bytes
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| 79 | * used to initialize the new object. */
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| 80 | register int length; /* The number of bytes to copy from "bytes"
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| 81 | * when initializing the new object. If
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| 82 | * negative, use bytes up to the first
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| 83 | * NULL byte. */
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| 84 | {
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| 85 | return Tcl_DbNewStringObj(bytes, length, "unknown", 0);
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| 86 | }
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| 87 |
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| 88 | #else /* if not TCL_MEM_DEBUG */
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| 89 |
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| 90 | Tcl_Obj *
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| 91 | Tcl_NewStringObj(bytes, length)
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| 92 | register char *bytes; /* Points to the first of the length bytes
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| 93 | * used to initialize the new object. */
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| 94 | register int length; /* The number of bytes to copy from "bytes"
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| 95 | * when initializing the new object. If
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| 96 | * negative, use bytes up to the first
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| 97 | * NULL byte. */
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| 98 | {
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| 99 | register Tcl_Obj *objPtr;
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| 100 |
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| 101 | if (length < 0) {
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| 102 | length = (bytes? strlen(bytes) : 0);
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| 103 | }
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| 104 | TclNewObj(objPtr);
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| 105 | TclInitStringRep(objPtr, bytes, length);
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| 106 | return objPtr;
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| 107 | }
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| 108 | #endif /* TCL_MEM_DEBUG */
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| 109 | |
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| 110 |
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| 111 | /*
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| 112 | *----------------------------------------------------------------------
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| 113 | *
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| 114 | * Tcl_DbNewStringObj --
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| 115 | *
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| 116 | * This procedure is normally called when debugging: i.e., when
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| 117 | * TCL_MEM_DEBUG is defined. It creates new string objects. It is the
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| 118 | * same as the Tcl_NewStringObj procedure above except that it calls
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| 119 | * Tcl_DbCkalloc directly with the file name and line number from its
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| 120 | * caller. This simplifies debugging since then the checkmem command
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| 121 | * will report the correct file name and line number when reporting
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| 122 | * objects that haven't been freed.
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| 123 | *
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| 124 | * When TCL_MEM_DEBUG is not defined, this procedure just returns the
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| 125 | * result of calling Tcl_NewStringObj.
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| 126 | *
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| 127 | * Results:
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| 128 | * A newly created string object is returned that has ref count zero.
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| 129 | *
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| 130 | * Side effects:
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| 131 | * The new object's internal string representation will be set to a
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| 132 | * copy of the length bytes starting at "bytes". If "length" is
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| 133 | * negative, use bytes up to the first NULL byte; i.e., assume "bytes"
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| 134 | * points to a C-style NULL-terminated string. The object's type is set
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| 135 | * to NULL. An extra NULL is added to the end of the new object's byte
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| 136 | * array.
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| 137 | *
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| 138 | *----------------------------------------------------------------------
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| 139 | */
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| 140 |
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| 141 | #ifdef TCL_MEM_DEBUG
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| 142 |
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| 143 | Tcl_Obj *
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| 144 | Tcl_DbNewStringObj(bytes, length, file, line)
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| 145 | register char *bytes; /* Points to the first of the length bytes
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| 146 | * used to initialize the new object. */
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| 147 | register int length; /* The number of bytes to copy from "bytes"
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| 148 | * when initializing the new object. If
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| 149 | * negative, use bytes up to the first
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| 150 | * NULL byte. */
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| 151 | char *file; /* The name of the source file calling this
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| 152 | * procedure; used for debugging. */
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| 153 | int line; /* Line number in the source file; used
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| 154 | * for debugging. */
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| 155 | {
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| 156 | register Tcl_Obj *objPtr;
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| 157 |
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| 158 | if (length < 0) {
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| 159 | length = (bytes? strlen(bytes) : 0);
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| 160 | }
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| 161 | TclDbNewObj(objPtr, file, line);
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| 162 | TclInitStringRep(objPtr, bytes, length);
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| 163 | return objPtr;
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| 164 | }
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| 165 |
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| 166 | #else /* if not TCL_MEM_DEBUG */
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| 167 |
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| 168 | Tcl_Obj *
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| 169 | Tcl_DbNewStringObj(bytes, length, file, line)
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| 170 | register char *bytes; /* Points to the first of the length bytes
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| 171 | * used to initialize the new object. */
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| 172 | register int length; /* The number of bytes to copy from "bytes"
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| 173 | * when initializing the new object. If
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| 174 | * negative, use bytes up to the first
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| 175 | * NULL byte. */
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| 176 | char *file; /* The name of the source file calling this
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| 177 | * procedure; used for debugging. */
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| 178 | int line; /* Line number in the source file; used
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| 179 | * for debugging. */
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| 180 | {
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| 181 | return Tcl_NewStringObj(bytes, length);
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| 182 | }
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| 183 | #endif /* TCL_MEM_DEBUG */
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| 184 | |
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| 185 |
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| 186 | /*
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| 187 | *----------------------------------------------------------------------
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| 188 | *
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| 189 | * Tcl_SetStringObj --
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| 190 | *
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| 191 | * Modify an object to hold a string that is a copy of the bytes
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| 192 | * indicated by the byte pointer and length arguments.
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| 193 | *
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| 194 | * Results:
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| 195 | * None.
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| 196 | *
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| 197 | * Side effects:
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| 198 | * The object's string representation will be set to a copy of
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| 199 | * the "length" bytes starting at "bytes". If "length" is negative, use
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| 200 | * bytes up to the first NULL byte; i.e., assume "bytes" points to a
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| 201 | * C-style NULL-terminated string. The object's old string and internal
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| 202 | * representations are freed and the object's type is set NULL.
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| 203 | *
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| 204 | *----------------------------------------------------------------------
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| 205 | */
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| 206 |
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| 207 | void
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| 208 | Tcl_SetStringObj(objPtr, bytes, length)
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| 209 | register Tcl_Obj *objPtr; /* Object whose internal rep to init. */
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| 210 | char *bytes; /* Points to the first of the length bytes
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| 211 | * used to initialize the object. */
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| 212 | register int length; /* The number of bytes to copy from "bytes"
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| 213 | * when initializing the object. If
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| 214 | * negative, use bytes up to the first
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| 215 | * NULL byte.*/
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| 216 | {
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| 217 | register Tcl_ObjType *oldTypePtr = objPtr->typePtr;
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| 218 |
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| 219 | /*
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| 220 | * Free any old string rep, then set the string rep to a copy of
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| 221 | * the length bytes starting at "bytes".
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| 222 | */
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| 223 |
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| 224 | if (Tcl_IsShared(objPtr)) {
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| 225 | panic("Tcl_SetStringObj called with shared object");
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| 226 | }
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| 227 |
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| 228 | Tcl_InvalidateStringRep(objPtr);
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| 229 | if (length < 0) {
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| 230 | length = strlen(bytes);
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| 231 | }
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| 232 | TclInitStringRep(objPtr, bytes, length);
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| 233 |
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| 234 | /*
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| 235 | * Set the type to NULL and free any internal rep for the old type.
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| 236 | */
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| 237 |
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| 238 | if ((oldTypePtr != NULL) && (oldTypePtr->freeIntRepProc != NULL)) {
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| 239 | oldTypePtr->freeIntRepProc(objPtr);
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| 240 | }
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| 241 | objPtr->typePtr = NULL;
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| 242 | }
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| 243 | |
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| 244 |
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| 245 | /*
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| 246 | *----------------------------------------------------------------------
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| 247 | *
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| 248 | * Tcl_SetObjLength --
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| 249 | *
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| 250 | * This procedure changes the length of the string representation
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| 251 | * of an object.
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| 252 | *
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| 253 | * Results:
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| 254 | * None.
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| 255 | *
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| 256 | * Side effects:
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| 257 | * If the size of objPtr's string representation is greater than
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| 258 | * length, then it is reduced to length and a new terminating null
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| 259 | * byte is stored in the strength. If the length of the string
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| 260 | * representation is greater than length, the storage space is
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| 261 | * reallocated to the given length; a null byte is stored at the
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| 262 | * end, but other bytes past the end of the original string
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| 263 | * representation are undefined. The object's internal
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| 264 | * representation is changed to "expendable string".
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| 265 | *
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| 266 | *----------------------------------------------------------------------
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| 267 | */
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| 268 |
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| 269 | void
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| 270 | Tcl_SetObjLength(objPtr, length)
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| 271 | register Tcl_Obj *objPtr; /* Pointer to object. This object must
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| 272 | * not currently be shared. */
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| 273 | register int length; /* Number of bytes desired for string
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| 274 | * representation of object, not including
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| 275 | * terminating null byte. */
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| 276 | {
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| 277 | char *new;
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| 278 |
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| 279 | if (Tcl_IsShared(objPtr)) {
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| 280 | panic("Tcl_SetObjLength called with shared object");
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| 281 | }
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| 282 | if (objPtr->typePtr != &tclStringType) {
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| 283 | ConvertToStringType(objPtr);
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| 284 | }
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| 285 |
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| 286 | if ((long)length > objPtr->internalRep.longValue) {
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| 287 | /*
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| 288 | * Not enough space in current string. Reallocate the string
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| 289 | * space and free the old string.
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| 290 | */
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| 291 |
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| 292 | new = (char *) ckalloc((unsigned) (length+1));
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| 293 | if (objPtr->bytes != NULL) {
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| 294 | memcpy((VOID *) new, (VOID *) objPtr->bytes,
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| 295 | (size_t) objPtr->length);
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| 296 | Tcl_InvalidateStringRep(objPtr);
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| 297 | }
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| 298 | objPtr->bytes = new;
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| 299 | objPtr->internalRep.longValue = (long) length;
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| 300 | }
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| 301 | objPtr->length = length;
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| 302 | if ((objPtr->bytes != NULL) && (objPtr->bytes != tclEmptyStringRep)) {
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| 303 | objPtr->bytes[length] = 0;
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| 304 | }
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| 305 | }
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| 306 | |
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| 307 |
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| 308 | /*
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| 309 | *----------------------------------------------------------------------
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| 310 | *
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| 311 | * Tcl_AppendToObj --
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| 312 | *
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| 313 | * This procedure appends a sequence of bytes to an object.
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| 314 | *
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| 315 | * Results:
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| 316 | * None.
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| 317 | *
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| 318 | * Side effects:
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| 319 | * The bytes at *bytes are appended to the string representation
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| 320 | * of objPtr.
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| 321 | *
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| 322 | *----------------------------------------------------------------------
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| 323 | */
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| 324 |
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| 325 | void
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| 326 | Tcl_AppendToObj(objPtr, bytes, length)
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| 327 | register Tcl_Obj *objPtr; /* Points to the object to append to. */
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| 328 | char *bytes; /* Points to the bytes to append to the
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| 329 | * object. */
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| 330 | register int length; /* The number of bytes to append from
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| 331 | * "bytes". If < 0, then append all bytes
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| 332 | * up to NULL byte. */
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| 333 | {
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| 334 | int newLength, oldLength;
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| 335 |
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| 336 | if (Tcl_IsShared(objPtr)) {
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| 337 | panic("Tcl_AppendToObj called with shared object");
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| 338 | }
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| 339 | if (objPtr->typePtr != &tclStringType) {
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| 340 | ConvertToStringType(objPtr);
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| 341 | }
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| 342 | if (length < 0) {
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| 343 | length = strlen(bytes);
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| 344 | }
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| 345 | if (length == 0) {
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| 346 | return;
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| 347 | }
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| 348 | oldLength = objPtr->length;
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| 349 | newLength = length + oldLength;
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| 350 | if ((long)newLength > objPtr->internalRep.longValue) {
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| 351 | /*
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| 352 | * There isn't currently enough space in the string
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| 353 | * representation so allocate additional space. In fact,
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| 354 | * overallocate so that there is room for future growth without
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| 355 | * having to reallocate again.
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| 356 | */
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| 357 |
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| 358 | Tcl_SetObjLength(objPtr, 2*newLength);
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| 359 | }
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| 360 | if (length > 0) {
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| 361 | memcpy((VOID *) (objPtr->bytes + oldLength), (VOID *) bytes,
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| 362 | (size_t) length);
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| 363 | objPtr->length = newLength;
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| 364 | objPtr->bytes[objPtr->length] = 0;
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| 365 | }
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| 366 | }
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| 367 | |
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| 368 |
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| 369 | /*
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| 370 | *----------------------------------------------------------------------
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| 371 | *
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| 372 | * Tcl_AppendStringsToObj --
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| 373 | *
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| 374 | * This procedure appends one or more null-terminated strings
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| 375 | * to an object.
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| 376 | *
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| 377 | * Results:
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| 378 | * None.
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| 379 | *
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| 380 | * Side effects:
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| 381 | * The contents of all the string arguments are appended to the
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| 382 | * string representation of objPtr.
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| 383 | *
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| 384 | *----------------------------------------------------------------------
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| 385 | */
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| 386 |
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| 387 | void
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| 388 | Tcl_AppendStringsToObj TCL_VARARGS_DEF(Tcl_Obj *,arg1)
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| 389 | {
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| 390 | va_list argList;
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| 391 | register Tcl_Obj *objPtr;
|
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| 392 | int newLength, oldLength;
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| 393 | register char *string, *dst;
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| 394 |
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| 395 | objPtr = (Tcl_Obj *) TCL_VARARGS_START(Tcl_Obj *,arg1,argList);
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| 396 | if (Tcl_IsShared(objPtr)) {
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| 397 | panic("Tcl_AppendStringsToObj called with shared object");
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| 398 | }
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| 399 | if (objPtr->typePtr != &tclStringType) {
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| 400 | ConvertToStringType(objPtr);
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| 401 | }
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| 402 |
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| 403 | /*
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| 404 | * Figure out how much space is needed for all the strings, and
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| 405 | * expand the string representation if it isn't big enough. If no
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| 406 | * bytes would be appended, just return.
|
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| 407 | */
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| 408 |
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| 409 | newLength = oldLength = objPtr->length;
|
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| 410 | while (1) {
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| 411 | string = va_arg(argList, char *);
|
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| 412 | if (string == NULL) {
|
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| 413 | break;
|
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| 414 | }
|
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| 415 | newLength += strlen(string);
|
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| 416 | }
|
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| 417 | if (newLength == oldLength) {
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| 418 | return;
|
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| 419 | }
|
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| 420 |
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| 421 | if ((long)newLength > objPtr->internalRep.longValue) {
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| 422 | /*
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| 423 | * There isn't currently enough space in the string
|
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| 424 | * representation so allocate additional space. If the current
|
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| 425 | * string representation isn't empty (i.e. it looks like we're
|
|---|
| 426 | * doing a series of appends) then overallocate the space so
|
|---|
| 427 | * that we won't have to do as much reallocation in the future.
|
|---|
| 428 | */
|
|---|
| 429 |
|
|---|
| 430 | Tcl_SetObjLength(objPtr,
|
|---|
| 431 | (objPtr->length == 0) ? newLength : 2*newLength);
|
|---|
| 432 | }
|
|---|
| 433 |
|
|---|
| 434 | /*
|
|---|
| 435 | * Make a second pass through the arguments, appending all the
|
|---|
| 436 | * strings to the object.
|
|---|
| 437 | */
|
|---|
| 438 |
|
|---|
| 439 | TCL_VARARGS_START(Tcl_Obj *,arg1,argList);
|
|---|
| 440 | dst = objPtr->bytes + oldLength;
|
|---|
| 441 | while (1) {
|
|---|
| 442 | string = va_arg(argList, char *);
|
|---|
| 443 | if (string == NULL) {
|
|---|
| 444 | break;
|
|---|
| 445 | }
|
|---|
| 446 | while (*string != 0) {
|
|---|
| 447 | *dst = *string;
|
|---|
| 448 | dst++;
|
|---|
| 449 | string++;
|
|---|
| 450 | }
|
|---|
| 451 | }
|
|---|
| 452 |
|
|---|
| 453 | /*
|
|---|
| 454 | * Add a null byte to terminate the string. However, be careful:
|
|---|
| 455 | * it's possible that the object is totally empty (if it was empty
|
|---|
| 456 | * originally and there was nothing to append). In this case dst is
|
|---|
| 457 | * NULL; just leave everything alone.
|
|---|
| 458 | */
|
|---|
| 459 |
|
|---|
| 460 | if (dst != NULL) {
|
|---|
| 461 | *dst = 0;
|
|---|
| 462 | }
|
|---|
| 463 | objPtr->length = newLength;
|
|---|
| 464 | va_end(argList);
|
|---|
| 465 | }
|
|---|
| 466 | |
|---|
| 467 |
|
|---|
| 468 | /*
|
|---|
| 469 | *----------------------------------------------------------------------
|
|---|
| 470 | *
|
|---|
| 471 | * ConvertToStringType --
|
|---|
| 472 | *
|
|---|
| 473 | * This procedure converts the internal representation of an object
|
|---|
| 474 | * to "expandable string" type.
|
|---|
| 475 | *
|
|---|
| 476 | * Results:
|
|---|
| 477 | * None.
|
|---|
| 478 | *
|
|---|
| 479 | * Side effects:
|
|---|
| 480 | * Any old internal reputation for objPtr is freed and the
|
|---|
| 481 | * internal representation is set to that for an expandable string
|
|---|
| 482 | * (the field internalRep.longValue holds 1 less than the allocated
|
|---|
| 483 | * length of objPtr's string representation).
|
|---|
| 484 | *
|
|---|
| 485 | *----------------------------------------------------------------------
|
|---|
| 486 | */
|
|---|
| 487 |
|
|---|
| 488 | static void
|
|---|
| 489 | ConvertToStringType(objPtr)
|
|---|
| 490 | register Tcl_Obj *objPtr; /* Pointer to object. Must have a
|
|---|
| 491 | * typePtr that isn't &tclStringType. */
|
|---|
| 492 | {
|
|---|
| 493 | if (objPtr->typePtr != NULL) {
|
|---|
| 494 | if (objPtr->bytes == NULL) {
|
|---|
| 495 | objPtr->typePtr->updateStringProc(objPtr);
|
|---|
| 496 | }
|
|---|
| 497 | if (objPtr->typePtr->freeIntRepProc != NULL) {
|
|---|
| 498 | objPtr->typePtr->freeIntRepProc(objPtr);
|
|---|
| 499 | }
|
|---|
| 500 | }
|
|---|
| 501 | objPtr->typePtr = &tclStringType;
|
|---|
| 502 | if (objPtr->bytes != NULL) {
|
|---|
| 503 | objPtr->internalRep.longValue = (long)objPtr->length;
|
|---|
| 504 | } else {
|
|---|
| 505 | objPtr->internalRep.longValue = 0;
|
|---|
| 506 | objPtr->length = 0;
|
|---|
| 507 | }
|
|---|
| 508 | }
|
|---|
| 509 | |
|---|
| 510 |
|
|---|
| 511 | /*
|
|---|
| 512 | *----------------------------------------------------------------------
|
|---|
| 513 | *
|
|---|
| 514 | * DupStringInternalRep --
|
|---|
| 515 | *
|
|---|
| 516 | * Initialize the internal representation of a new Tcl_Obj to a
|
|---|
| 517 | * copy of the internal representation of an existing string object.
|
|---|
| 518 | *
|
|---|
| 519 | * Results:
|
|---|
| 520 | * None.
|
|---|
| 521 | *
|
|---|
| 522 | * Side effects:
|
|---|
| 523 | * copyPtr's internal rep is set to a copy of srcPtr's internal
|
|---|
| 524 | * representation.
|
|---|
| 525 | *
|
|---|
| 526 | *----------------------------------------------------------------------
|
|---|
| 527 | */
|
|---|
| 528 |
|
|---|
| 529 | static void
|
|---|
| 530 | DupStringInternalRep(srcPtr, copyPtr)
|
|---|
| 531 | register Tcl_Obj *srcPtr; /* Object with internal rep to copy. Must
|
|---|
| 532 | * have an internal representation of type
|
|---|
| 533 | * "expandable string". */
|
|---|
| 534 | register Tcl_Obj *copyPtr; /* Object with internal rep to set. Must
|
|---|
| 535 | * not currently have an internal rep.*/
|
|---|
| 536 | {
|
|---|
| 537 | /*
|
|---|
| 538 | * Tricky point: the string value was copied by generic object
|
|---|
| 539 | * management code, so it doesn't contain any extra bytes that
|
|---|
| 540 | * might exist in the source object.
|
|---|
| 541 | */
|
|---|
| 542 |
|
|---|
| 543 | copyPtr->internalRep.longValue = (long)copyPtr->length;
|
|---|
| 544 | copyPtr->typePtr = &tclStringType;
|
|---|
| 545 | }
|
|---|
| 546 | |
|---|
| 547 |
|
|---|
| 548 | /*
|
|---|
| 549 | *----------------------------------------------------------------------
|
|---|
| 550 | *
|
|---|
| 551 | * SetStringFromAny --
|
|---|
| 552 | *
|
|---|
| 553 | * Create an internal representation of type "expandable string"
|
|---|
| 554 | * for an object.
|
|---|
| 555 | *
|
|---|
| 556 | * Results:
|
|---|
| 557 | * This operation always succeeds and returns TCL_OK.
|
|---|
| 558 | *
|
|---|
| 559 | * Side effects:
|
|---|
| 560 | * This procedure does nothing; there is no advantage in converting
|
|---|
| 561 | * the internal representation now, so we just defer it.
|
|---|
| 562 | *
|
|---|
| 563 | *----------------------------------------------------------------------
|
|---|
| 564 | */
|
|---|
| 565 |
|
|---|
| 566 | static int
|
|---|
| 567 | SetStringFromAny(interp, objPtr)
|
|---|
| 568 | Tcl_Interp *interp; /* Used for error reporting if not NULL. */
|
|---|
| 569 | Tcl_Obj *objPtr; /* The object to convert. */
|
|---|
| 570 | {
|
|---|
| 571 | return TCL_OK;
|
|---|
| 572 | }
|
|---|
| 573 | |
|---|
| 574 |
|
|---|
| 575 | /*
|
|---|
| 576 | *----------------------------------------------------------------------
|
|---|
| 577 | *
|
|---|
| 578 | * UpdateStringOfString --
|
|---|
| 579 | *
|
|---|
| 580 | * Update the string representation for an object whose internal
|
|---|
| 581 | * representation is "expandable string".
|
|---|
| 582 | *
|
|---|
| 583 | * Results:
|
|---|
| 584 | * None.
|
|---|
| 585 | *
|
|---|
| 586 | * Side effects:
|
|---|
| 587 | * None.
|
|---|
| 588 | *
|
|---|
| 589 | *----------------------------------------------------------------------
|
|---|
| 590 | */
|
|---|
| 591 |
|
|---|
| 592 | static void
|
|---|
| 593 | UpdateStringOfString(objPtr)
|
|---|
| 594 | Tcl_Obj *objPtr; /* Object with string rep to update. */
|
|---|
| 595 | {
|
|---|
| 596 | /*
|
|---|
| 597 | * The string is almost always valid already, in which case there's
|
|---|
| 598 | * nothing for us to do. The only case we have to worry about is if
|
|---|
| 599 | * the object is totally null. In this case, set the string rep to
|
|---|
| 600 | * an empty string.
|
|---|
| 601 | */
|
|---|
| 602 |
|
|---|
| 603 | if (objPtr->bytes == NULL) {
|
|---|
| 604 | objPtr->bytes = tclEmptyStringRep;
|
|---|
| 605 | objPtr->length = 0;
|
|---|
| 606 | }
|
|---|
| 607 | return;
|
|---|
| 608 | }
|
|---|
