gecko-dev/cmd/macfe/utility/cstring.cp

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2.0 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "cstring.h"
#include "xpassert.h"
void
cstring::operator+= (const char *s)
{
if (s != NULL && s[0] != '\0')
{
int newLength = length() + strlen(s);
reserve (newLength+1, true);
strcat (data(), s);
}
}
void
cstring::truncAt (char c)
{
char *cc = strchr (data(), c);
if (cc) {
*cc = 0;
reserve (length()+1, true);
}
}
char*
cstring::reserve (int len, Boolean preserve)
{
char *dest = space.internal;
if (haveExternalSpace)
if (len > cstringMaxInternalLen) // can reuse space
dest = space.external = (char*) realloc (space.external, len);
else { // don't need external space
char *oldExternal = space.external;
if (preserve) { // can't guarantee preservation since it's shrinking
memcpy (oldExternal, space.internal, cstringMaxInternalLen);
dest[cstringMaxInternalLen] = 0;
}
free (oldExternal);
haveExternalSpace = false;
}
else
if (len > cstringMaxInternalLen) { // need new space
dest= (char*) malloc (len);
if (preserve)
memcpy (dest, space.internal, cstringMaxInternalLen);
space.external = dest;
haveExternalSpace = true;
}
return dest;
}
void
cstring::assign (const void *sd, int len)
{
XP_ASSERT(sd != NULL || len == 0);
char *dest = reserve (len+1, false);
if (sd != NULL)
memcpy (dest, sd, len);
dest[len] = 0;
}