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/**
* @file
* @ingroup cgraph_core
*/
/*************************************************************************
* Copyright (c) 2011 AT&T Intellectual Property
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-v10.html
*
* Contributors: Details at https://graphviz.org
*************************************************************************/
#include "config.h"
#include <stddef.h>
#include <stdio.h>
#include <cgraph/cghdr.h>
#include <cgraph/rdr.h>
static int iofread(void *chan, char *buf, int bufsize)
{
if (fgets(buf, bufsize, chan))
return (int)strlen(buf);
else
return 0;
}
/* default IO methods */
static int ioputstr(void *chan, const char *str)
{
return fputs(str, chan);
}
static int ioflush(void *chan)
{
return fflush(chan);
}
Agiodisc_t AgIoDisc = { iofread, ioputstr, ioflush };
static int
memiofread(void *chan, char *buf, int bufsize)
{
const char *ptr;
char *optr;
char c;
int l;
rdr_t *s;
if (bufsize == 0) return 0;
s = chan;
if (s->cur >= s->len)
return 0;
l = 0;
ptr = s->data + s->cur;
optr = buf;
/* We know we have at least one character */
c = *ptr++;
do {
*optr++ = c;
l++;
/* continue if c is not newline, we have space in buffer,
* and next character is non-null (we are working with
* null-terminated strings.
*/
} while (c != '\n' && l < bufsize && (c = *ptr++));
s->cur += (size_t)l;
return l;
}
static Agiodisc_t memIoDisc = {memiofread, 0, 0};
static Agraph_t *agmemread0(Agraph_t *arg_g, const char *cp)
{
rdr_t rdr;
Agdisc_t disc;
memIoDisc.putstr = AgIoDisc.putstr;
memIoDisc.flush = AgIoDisc.flush;
rdr.data = cp;
rdr.len = strlen(cp);
rdr.cur = 0;
disc.id = &AgIdDisc;
disc.io = &memIoDisc;
if (arg_g) return agconcat(arg_g, NULL, &rdr, &disc);
return agread(&rdr, &disc);
}
Agraph_t *agmemread(const char *cp)
{
return agmemread0(0, cp);
}
Agraph_t *agmemconcat(Agraph_t *g, const char *cp)
{
return agmemread0(g, cp);
}
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