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
   5 This file is part of groff.
   6
   7 groff is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 groff is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with groff; see the file COPYING.  If not, write to the Free Software
  19 Foundation, 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
  27 extern void change_filename(const char *);
  28 extern void change_lineno(int);
  29
  30 int 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 }