src/libs/libgroff/lf.cpp

   1 // -*- C++ -*-
   2 /* Copyright (C) 1989, 1990, 1991, 1992 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  20
  21 #include <string.h>
  22 #include <ctype.h>
  23 #include "cset.h"
  24 #include "stringclass.h"
  25
  26 extern void change_filename(const char *);
  27 extern void change_lineno(int);
  28
  29 int interpret_lf_args(const char *p)
  30 {
  31   while (*p == ' ')
  32     p++;
  33   if (!csdigit(*p))
  34     return 0;
  35   int ln = 0;
  36   do {
  37     ln *= 10;
  38     ln += *p++ - '0';
  39   } while (csdigit(*p));
  40   if (*p != ' ' && *p != '\n' && *p != '\0')
  41     return 0;
  42   while (*p == ' ')
  43     p++;
  44   if (*p == '\0' || *p == '\n')  {
  45     change_lineno(ln);
  46     return 1;
  47   }
  48   const char *q;
  49   for (q = p;
  50        *q != '\0' && *q != ' ' && *q != '\n' && *q != '\\';
  51        q++)
  52     ;
  53   string tem(p, q - p);
  54   while (*q == ' ')
  55     q++;
  56   if (*q != '\n' && *q != '\0')
  57     return 0;
  58   tem += '\0';
  59   change_filename(tem.contents());
  60   change_lineno(ln);
  61   return 1;
  62 }