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/*
* SCCS: @(#)bufchk.c 1.8 (98/08/28)
*
* UniSoft Ltd., London, England
*
* (C) Copyright 1992 X/Open Company Limited
*
* All rights reserved. No part of this source code may be reproduced,
* stored in a retrieval system, or transmitted, in any form or by any
* means, electronic, mechanical, photocopying, recording or otherwise,
* except as stated in the end-user licence agreement, without the prior
* permission of the copyright owners.
*
* X/Open and the 'X' symbol are trademarks of X/Open Company Limited in
* the UK and other countries.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifndef lint
static char sccsid[] = "@(#)bufchk.c 1.8 (98/08/28) TET3 release 3.3";
#endif
/************************************************************************
SCCS: @(#)bufchk.c 1.8 98/08/28 TETware release 3.3
NAME: bufchk.c
PRODUCT: TETware
AUTHOR: Andrew Dingwall, UniSoft Ltd.
DATE CREATED: April 1992
DESCRIPTION:
buffer check and (re)allocation function
MODIFICATIONS:
Andrew Dingwall, UniSoft Ltd., July 1998
Added support for shared API libraries.
************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "dtmac.h"
#include "error.h"
#include "ltoa.h"
#include "dtetlib.h"
#ifdef NEEDsrcFile
static char srcFile[] = __FILE__; /* file name for error reporting */
#endif
/*
** tet_bufchk() - check that there is enough space in a data buffer
** pointed to by *bpp, length at *lp, and grow it if necessary
**
** return 0 if successful or -1 on error
*/
TET_IMPORT int tet_bufchk(bpp, lp, newlen)
register char **bpp;
register int *lp, newlen;
{
register char *bp;
#ifndef NOTRACE
/* the assert was done in buftrace.c */
#else
ASSERT(newlen >= 0);
#endif
if (*lp >= newlen)
return(0);
errno = 0;
if (*bpp == (char *) 0) {
TRACE1(tet_Tbuf, 8, "allocate new buffer");
bp = malloc((size_t) newlen);
}
else {
TRACE1(tet_Tbuf, 8, "grow existing buffer");
bp = realloc(*bpp, (size_t) newlen);
}
if (bp) {
*bpp = bp;
*lp = newlen;
return(0);
}
/* here if malloc/realloc failed */
error(errno, "can't grow data buffer, wanted", tet_i2a(newlen));
if (*bpp) {
errno = 0;
if ((bp = realloc(*bpp, (size_t) *lp)) == (char *) 0) {
error(errno, "can't realloc old data buffer",
(char *) 0);
*lp = 0;
}
else
TRACE2(tet_Tbuf, 8, "realloc old buffer at %s",
tet_i2x(bp));
*bpp = bp;
}
else
*lp = 0;
return(-1);
}
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