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/***************************************************************************
* Copyright (C) 2009 By Duane Ellis *
* openocd@duaneellis.com *
* *
* This program 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. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "membuf.h"
struct membuf {
// buflen is alway "+1" bigger then
// what is shown here, the +1 is for
// the NULL string terminator
#define DEFAULT_BUFSIZE 100
size_t maxlen; // allocated size
size_t curlen; // where we are inserting at
char *_strtoklast;
void *buf;
};
#define space_avail(pBuf) (pBuf->maxlen - pBuf->curlen)
#define dataend(pBuf) (((char *)(pBuf->buf)) + pBuf->curlen)
size_t
membuf_len(struct membuf *pBuf)
{
return pBuf->curlen;
}
const void *
membuf_datapointer(struct membuf *pBuf)
{
return ((void *)(pBuf->buf));
}
const char *
membuf_strtok(struct membuf *pBuf, const char *sep, void **pLast)
{
if (pBuf) {
pBuf->_strtoklast = NULL;
*pLast = pBuf;
// this should be "strtok_r()" but windows lacks */
return strtok(((char *)(pBuf->buf)), sep);
} else {
// recover our pBuf
pBuf = *((struct membuf **)(pLast));
// this should be "strtok_r()" but windows lacks */
return strtok( NULL, sep);
}
}
struct membuf *
membuf_new(void)
{
// by default - parameters are zero.
struct membuf *pBuf;
pBuf = calloc(1, sizeof(*pBuf));
if (pBuf) {
// we *ALWAYS* allocate +1 for null terminator.
pBuf->buf = calloc(DEFAULT_BUFSIZE + 1, sizeof(char));
if (pBuf->buf == NULL) {
free(pBuf);
pBuf = NULL;
} else {
pBuf->maxlen = DEFAULT_BUFSIZE;
}
}
return pBuf;
}
struct membuf *
membuf_grow(struct membuf *pBuf, int n)
{
void *vp;
signed int newsize;
// this is a *SIGNED* value
newsize = ((int)(pBuf->maxlen)) + n;
// do not go negative, or too small
if (newsize < DEFAULT_BUFSIZE) {
newsize = DEFAULT_BUFSIZE;
}
// always alloc +1 for the null terminator
vp = realloc(pBuf->buf, newsize + 1);
if (vp) {
pBuf->buf = vp;
pBuf->maxlen = newsize;
return pBuf;
} else {
return NULL;
}
}
void membuf_reset(struct membuf *pBuf)
{
pBuf->curlen = 0;
}
void membuf_delete(struct membuf *pBuf)
{
if (pBuf) {
if (pBuf->buf) {
// wack data so it cannot be reused
memset(pBuf->buf,0,pBuf->maxlen);
free(pBuf->buf);
}
// wack dat so it cannot be reused
memset(pBuf,0,sizeof(pBuf));
free(pBuf);
}
}
int
membuf_sprintf(struct membuf *pBuf , const char *fmt, ...)
{
int r;
va_list ap;
va_start(ap, fmt);
r = membuf_vsprintf(pBuf, fmt, ap);
va_end(ap);
return r;
}
int
membuf_vsprintf(struct membuf *pBuf, const char *fmt, va_list ap)
{
int r;
size_t sa;
int grew;
grew = 0;
for (;;) {
sa = space_avail(pBuf);
// do work
r = vsnprintf(dataend(pBuf),
sa,
fmt,
ap);
if ((r > 0) && (((size_t)(r)) < sa)) {
// Success!
pBuf->curlen += ((size_t)(r));
// remember: We always alloc'ed +1
// so this does not overflow
((char *)(pBuf->buf))[ pBuf->curlen ] = 0;
r = 0;
break;
}
// failure
if (r < 0) {
// Option(A) format error
// Option(B) glibc2.0 bug
// assume (B).
r = (4 * DEFAULT_BUFSIZE);
}
// don't do this again
if (grew) {
r = -1;
break;
}
grew = 1;
pBuf = membuf_grow(pBuf, r);
if (pBuf == NULL) {
// grow failed
r = -1;
break;
}
}
return r;
}
struct membuf *
membuf_strcat(struct membuf *pBuf, const char *pStr)
{
return membuf_append(pBuf, pStr, strlen(pStr));
}
struct membuf *
membuf_append(struct membuf *pBuf, const void *pData, size_t len)
{
size_t sa;
int r;
// how much room is there?
sa = space_avail(pBuf);
// will it fit?
if (sa < len) {
// if not, how much do we need?
r = ((int)(sa - len));
// do the grow.
pBuf = membuf_grow(pBuf, r);
// failed?
if (pBuf == NULL) {
return pBuf;
}
}
// append
memcpy(dataend(pBuf),
pData,
len);
pBuf->curlen += len;
return pBuf;
}
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