/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

 /* te.c: error message control, input line count */
#include "t..c"
#include <locale.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>

void
error(char *s)
{
        (void) fprintf(stderr, gettext("\n%s: line %d: %s\n"), ifile, iline, s);
        (void) fprintf(stderr, gettext("tbl quits\n"));
        exit(1);
}

char *
gets1(char *s, int len)
{
char *p;
int nbl;
while(len > 0)
        {
        iline++;
        while ((p = fgets(s,len,tabin))==0)
                {
                if (swapin()==0)
                        return((char *)0);
                }

        while (*s) s++;
        s--;
        if (*s == '\n') {
                *s-- = '\0';
        } else {
                if (!feof(tabin)) {
                        if (ferror(tabin))
                                error(strerror(errno));
                        else
                                error(gettext("Line too long"));
                }
        }

        for(nbl=0; *s == '\\' && s>p; s--)
                nbl++;
        if (linstart && nbl % 2) /* fold escaped nl if in table */
                {
                s++;
                len -= s - p;
                continue;
                }
        break;
        }

return(p);
}

# define BACKMAX 500

char backup[BACKMAX];
char *backp = backup;

void
un1getc(int c)
{
if (c=='\n')
        iline--;
*backp++ = c;
if (backp >= backup+BACKMAX)
        error(gettext("too much backup"));
}

int
get1char(void)
{
int c;
if (backp>backup)
        c = *--backp;
else
        c=getc(tabin);
if (c== EOF) /* EOF */
        {
        if (swapin() ==0)
                error(gettext("unexpected EOF"));
        c = getc(tabin);
        }
if (c== '\n')
        iline++;
return(c);
}