doc/utils/rfc_pg.c

   1 /*
   2  *  $Header: /var/cvsroot/strongswan/doc/utils/rfc_pg.c,v 1.1 2004/03/15 20:35:24 as Exp $
   3  *
   4  * from 2-nroff.template file.
   5  *
   6  *  Remove N lines following any line that contains a form feed (^L).
   7  *  (Why can't this be done with awk or sed?)
   8  *
   9  *  OPTION:
  10  *      -n#     Number of lines to delete following each ^L (0 default).
  11  * $Log: rfc_pg.c,v $
  12  * Revision 1.1  2004/03/15 20:35:24  as
  13  * added files from freeswan-2.04-x509-1.5.3
  14  *
  15  * Revision 1.1  2002/07/23 18:42:43  mcr
  16  *      required utility from IETF to help with formatting of drafts.
  17  *
  18  */
  19 #include <stdio.h>
  20
  21 #define FORM_FEED       '\f'
  22 #define OPTION          "n:N:"          /* for getopt() */
  23
  24 extern char *optarg;
  25 extern int optind;
  26
  27 main(argc, argv)
  28 int     argc;
  29 char    *argv[];
  30 {
  31   int   c,                              /* next input char */
  32         nlines = 0;                     /* lines to delete after ^L */
  33   void  print_and_delete();             /* print line starting with ^L,
  34                                            then delete N lines */
  35
  36 /*********************** Process option (-nlines) ***********************/
  37
  38   while ((c = getopt(argc, argv, OPTION)) != EOF)
  39     switch(c)
  40     {
  41       case 'n' :
  42       case 'N' :  nlines = atoi(optarg);
  43                   break;
  44     }
  45 /************************* READ AND PROCESS CHARS **********************/
  46
  47   while ((c = getchar()) != EOF)
  48     if (c == FORM_FEED)
  49       print_and_delete(nlines);         /* remove N lines after this one */
  50     else
  51       putchar(c);                       /* we write the form feed */
  52   exit(0);
  53 }
  54
  55 \f
  56 /*
  57  *  Print rest of line, then delete next N lines.
  58  */
  59 void print_and_delete(n)
  60 int  n;                                 /* nbr of lines to delete */
  61 {
  62   int   c,                              /* next input char */
  63         cntr = 0;                       /* count of deleted lines */
  64
  65   while ((c = getchar()) != '\n')       /* finish current line */
  66     putchar(c);
  67   putchar('\n');                        /* write the last CR */
  68   putchar(FORM_FEED);
  69
  70   for ( ; cntr < n; cntr++)
  71     while ((c = getchar()) != '\n')
  72       if (c == EOF)
  73         exit(0);                        /* exit on EOF */
  74   putchar(c);                           /* write that last CR */
  75 }
  76