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/*
* tclUtil.c --
*
* This file contains utility procedures that are used by many Tcl
* commands.
*
* Copyright (c) 1987-1993 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tclUtil.c 1.129 97/01/21 14:06:35
*/
#include "expWin.h"
#include "expDString.h"
#include <stdlib.h>
#include <string.h>
/*
*----------------------------------------------------------------------
*
* Tcl_DStringInit --
*
* Initializes a dynamic string, discarding any previous contents
* of the string (Tcl_DStringFree should have been called already
* if the dynamic string was previously in use).
*
* Results:
* None.
*
* Side effects:
* The dynamic string is initialized to be empty.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringInit(dsPtr)
register Tcl_DString *dsPtr; /* Pointer to structure for
* dynamic string. */
{
dsPtr->string = dsPtr->staticSpace;
dsPtr->length = 0;
dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
dsPtr->staticSpace[0] = 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringAppend --
*
* Append more characters to the current value of a dynamic string.
*
* Results:
* The return value is a pointer to the dynamic string's new value.
*
* Side effects:
* Length bytes from string (or all of string if length is less
* than zero) are added to the current value of the string. Memory
* gets reallocated if needed to accomodate the string's new size.
*
*----------------------------------------------------------------------
*/
char *
Tcl_DStringAppend(dsPtr, string, length)
register Tcl_DString *dsPtr; /* Structure describing dynamic
* string. */
CONST char *string; /* String to append. If length is
* -1 then this must be
* null-terminated. */
int length; /* Number of characters from string
* to append. If < 0, then append all
* of string, up to null at end. */
{
int newSize;
char *newString, *dst, *end;
if (length < 0) {
length = strlen(string);
}
newSize = length + dsPtr->length;
/*
* Allocate a larger buffer for the string if the current one isn't
* large enough. Allocate extra space in the new buffer so that there
* will be room to grow before we have to allocate again.
*/
if (newSize >= dsPtr->spaceAvl) {
dsPtr->spaceAvl = newSize*2;
newString = (char *) ckalloc((unsigned) dsPtr->spaceAvl);
memcpy((VOID *) newString, (VOID *) dsPtr->string,
(size_t) dsPtr->length);
if (dsPtr->string != dsPtr->staticSpace) {
ckfree(dsPtr->string);
}
dsPtr->string = newString;
}
/*
* Copy the new string into the buffer at the end of the old
* one.
*/
for (dst = (char *) dsPtr->string + dsPtr->length, end = (char *) string+length;
string < end; string++, dst++) {
*dst = *string;
}
*dst = 0;
dsPtr->length += length;
return dsPtr->string;
}
/*
*----------------------------------------------------------------------
*
* Tcl_DStringFree --
*
* Frees up any memory allocated for the dynamic string and
* reinitializes the string to an empty state.
*
* Results:
* None.
*
* Side effects:
* The previous contents of the dynamic string are lost, and
* the new value is an empty string.
*
*----------------------------------------------------------------------
*/
void
Tcl_DStringFree(dsPtr)
register Tcl_DString *dsPtr; /* Structure describing dynamic
* string. */
{
if (dsPtr->string != dsPtr->staticSpace) {
ckfree(dsPtr->string);
}
dsPtr->string = dsPtr->staticSpace;
dsPtr->length = 0;
dsPtr->spaceAvl = TCL_DSTRING_STATIC_SIZE;
dsPtr->staticSpace[0] = 0;
}
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