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/*
* Copyright (c) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
* 2002, 2003, 2004
* Ohio University.
*
* ---
*
* Starting with the release of tcptrace version 6 in 2001, tcptrace
* is licensed under the GNU General Public License (GPL). We believe
* that, among the available licenses, the GPL will do the best job of
* allowing tcptrace to continue to be a valuable, freely-available
* and well-maintained tool for the networking community.
*
* Previous versions of tcptrace were released under a license that
* was much less restrictive with respect to how tcptrace could be
* used in commercial products. Because of this, I am willing to
* consider alternate license arrangements as allowed in Section 10 of
* the GNU GPL. Before I would consider licensing tcptrace under an
* alternate agreement with a particular individual or company,
* however, I would have to be convinced that such an alternative
* would be to the greater benefit of the networking community.
*
* ---
*
* This file is part of Tcptrace.
*
* Tcptrace was originally written and continues to be maintained by
* Shawn Ostermann with the help of a group of devoted students and
* users (see the file 'THANKS'). The work on tcptrace has been made
* possible over the years through the generous support of NASA GRC,
* the National Science Foundation, and Sun Microsystems.
*
* Tcptrace is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Tcptrace is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tcptrace (in the file 'COPYING'); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Author: Shawn Ostermann
* School of Electrical Engineering and Computer Science
* Ohio University
* Athens, OH
* ostermann@cs.ohiou.edu
* http://www.tcptrace.org/
*/
#include "tcptrace.h"
static char const GCC_UNUSED rcsid_dstring[] =
"@(#)$Header: /usr/local/cvs/tcptrace/dstring.c,v 5.2 2003/11/19 14:38:01 sdo Exp $";
/* our dynamic string structure */
struct dstring {
char *buf;
int ix_nextch;
int buflen;
};
/* local routines */
static void DSExpand(struct dstring *pds);
/* make the total string size longer */
static void
DSExpand(struct dstring *pds)
{
unsigned newsize;
char *newbuf;
/* choose a new size */
if (pds->buflen == 0)
newsize = 64;
else if (pds->buflen < (16*1024))
newsize = pds->buflen * 2;
else
newsize = pds->buflen +(4*1024);
/* make the new buffer (using the old one if possible) */
newbuf = ReallocZ(pds->buf,pds->buflen,newsize);
pds->buflen = newsize;
pds->buf = newbuf;
}
/* Make a new dstring */
struct dstring *
DSNew(void)
{
struct dstring *pret;
/* malloc and zero out */
pret = MallocZ(sizeof(struct dstring));
return(pret);
}
/* Destroy a dstring */
void
DSDestroy(struct dstring **ppds)
{
free((*ppds)->buf);
free((*ppds));
*ppds = NULL;
}
/* erase the string, but leave the structure otherwise intact */
void
DSErase(
struct dstring *pds)
{
pds->ix_nextch = 0;
}
/* append a character to a dstring */
void
DSAppendChar(
struct dstring *pds,
char ch)
{
/* status:
buf[0,1,2,...(buflen-1)] are valid
buf[ix_nextch] is where the next character should go
if (ix_nextch > (buflen-1)), then it's full
same as (ix_nextch+1 > (buflen))
*/
if (1 /* for the null */ + pds->ix_nextch+1 > pds->buflen) {
DSExpand(pds);
}
pds->buf[pds->ix_nextch++] = ch;
pds->buf[pds->ix_nextch] = '\00'; /* keep it NULL terminated */
}
/* append a normal string to the end of a dstring */
void
DSAppendString(
struct dstring *pds,
char *str)
{
while (*str) {
DSAppendChar(pds,*str);
++str;
}
}
/* append at most 'len' characters from a normal string to a dstring */
void
DSAppendStringN(
struct dstring *pds,
char *str,
int len)
{
while (*str) {
if (len-- <= 0)
break;
DSAppendChar(pds,*str);
++str;
}
}
/* return the value of the string */
char *
DSVal(
struct dstring *pds)
{
if (pds->buflen)
return(pds->buf);
else
return(""); /* not used yet, treat as null */
}
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