/contrib/groff/src/libs/libgroff/lf.cpp

 1// -*- C++ -*-
 2/* Copyright (C) 1989, 1990, 1991, 1992, 2004 Free Software Foundation, Inc.
 3     Written by James Clark (jjc@jclark.com)
 4
 5This file is part of groff.
 6
 7groff is free software; you can redistribute it and/or modify it under
 8the terms of the GNU General Public License as published by the Free
 9Software Foundation; either version 2, or (at your option) any later
10version.
11
12groff is distributed in the hope that it will be useful, but WITHOUT ANY
13WARRANTY; without even the implied warranty of MERCHANTABILITY or
14FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15for more details.
16
17You should have received a copy of the GNU General Public License along
18with groff; see the file COPYING.  If not, write to the Free Software
19Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21#include <ctype.h>
22
23#include "lib.h"
24#include "cset.h"
25#include "stringclass.h"
26
27extern void change_filename(const char *);
28extern void change_lineno(int);
29
30int interpret_lf_args(const char *p)
31{
32  while (*p == ' ')
33    p++;
34  if (!csdigit(*p))
35    return 0;
36  int ln = 0;
37  do {
38    ln *= 10;
39    ln += *p++ - '0';
40  } while (csdigit(*p));
41  if (*p != ' ' && *p != '\n' && *p != '\0')
42    return 0;
43  while (*p == ' ')
44    p++;
45  if (*p == '\0' || *p == '\n')  {
46    change_lineno(ln);
47    return 1;
48  }
49  const char *q;
50  for (q = p;
51       *q != '\0' && *q != ' ' && *q != '\n' && *q != '\\';
52       q++)
53    ;
54  string tem(p, q - p);
55  while (*q == ' ')
56    q++;
57  if (*q != '\n' && *q != '\0')
58    return 0;
59  tem += '\0';
60  change_filename(tem.contents());
61  change_lineno(ln);
62  return 1;
63}