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/*************************************************************************
* 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
*************************************************************************/
/*
* Glenn Fowler
* AT&T Research
*
* expression library
*/
#include <expr/exlib.h>
#include <util/gv_ctype.h>
/*
* copy input token error context into buf of n chars and reset the context
* end of buf returned
*/
char*
excontext(Expr_t* p, char* buf, int n)
{
char* s;
char* t;
char* e;
s = buf;
if (p->linep > p->line || p->linewrap)
{
e = buf + n - 5;
if (p->linewrap)
{
t = p->linep + 1;
while (t < &p->line[sizeof(p->line)] && gv_isspace(*t))
t++;
if ((n = (sizeof(p->line) - (t - (p->linep + 1))) - (e - s)) > 0)
{
if (n > &p->line[sizeof(p->line)] - t)
t = &p->line[sizeof(p->line)];
else t += n;
}
while (t < &p->line[sizeof(p->line)])
*s++ = *t++;
}
t = p->line;
if (p->linewrap)
p->linewrap = 0;
else while (t < p->linep && gv_isspace(*t))
t++;
if ((n = (p->linep - t) - (e - s)) > 0)
t += n;
while (t < p->linep)
*s++ = *t++;
p->linep = p->line;
t = "<<< ";
while ((*s = *t++))
s++;
}
*s = 0;
return s;
}
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