cmd/tbl/te.c

/*
 * 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.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

 /* 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);
}