distrib/utils/more/option.c

   1 /*      $NetBSD: option.c,v 1.6 2003/08/07 09:28:00 agc Exp $   */
   2
   3 /*
   4  * Copyright (c) 1988 Mark Nudelman
   5  * Copyright (c) 1988, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/cdefs.h>
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)option.c    8.1 (Berkeley) 6/6/93";
  37 #else
  38 __RCSID("$NetBSD: option.c,v 1.6 2003/08/07 09:28:00 agc Exp $");
  39 #endif
  40 #endif /* not lint */
  41
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45
  46 #include "less.h"
  47 #include "extern.h"
  48
  49 int top_scroll;                 /* Repaint screen from top */
  50 int bs_mode;                    /* How to process backspaces */
  51 int caseless;                   /* Do "caseless" searches */
  52 int cbufs = 10;                 /* Current number of buffers */
  53 int linenums = 1;               /* Use line numbers */
  54 int quit_at_eof;
  55 int squeeze;                    /* Squeeze multiple blank lines into one */
  56 int tabstop = 8;                /* Tab settings */
  57
  58 char *firstsearch;
  59
  60 int
  61 option(argc, argv)
  62         int argc;
  63         char **argv;
  64 {
  65         static int sc_window_set = 0;
  66         int ch;
  67         char *p;
  68
  69         /* backward compatible processing for "+/search" */
  70         char **a;
  71         for (a = argv; *a; ++a)
  72                 if ((*a)[0] == '+' && (*a)[1] == '/')
  73                         (*a)[0] = '-';
  74
  75         optind = 1;             /* called twice, re-init getopt. */
  76         while ((ch = getopt(argc, argv, "0123456789/:ceinst:ux:f")) != -1)
  77                 switch((char)ch) {
  78                 case '0': case '1': case '2': case '3': case '4':
  79                 case '5': case '6': case '7': case '8': case '9':
  80                         /*
  81                          * kludge: more was originally designed to take
  82                          * a number after a dash.
  83                          */
  84                         if (!sc_window_set) {
  85                                 p = argv[optind - 1];
  86                                 if (p[0] == '-' && p[1] == ch && !p[2])
  87                                         sc_height = atoi(++p);
  88                                 else
  89                                         sc_height = atoi(argv[optind] + 1);
  90                                 sc_window_set = 1;
  91                         }
  92                         break;
  93                 case '/':
  94                         firstsearch = optarg;
  95                         break;
  96                 case 'c':
  97                         top_scroll = 1;
  98                         break;
  99                 case 'e':
 100                         quit_at_eof = 1;
 101                         break;
 102                 case 'i':
 103                         caseless = 1;
 104                         break;
 105                 case 'n':
 106                         linenums = 0;
 107                         break;
 108                 case 's':
 109                         squeeze = 1;
 110                         break;
 111                 case 'u':
 112                         bs_mode = 1;
 113                         break;
 114                 case 'x':
 115                         tabstop = atoi(optarg);
 116                         if (tabstop <= 0)
 117                                 tabstop = 8;
 118                         break;
 119                 case 'f':       /* ignore -f, compatibility with old more */
 120                         break;
 121                 case '?':
 122                 default:
 123                         fprintf(stderr,
 124                             "usage: more [-ceinus] [-x tabs] [-/ pattern] [-#] [file ...]\n");
 125                         exit(1);
 126                 }
 127         return(optind);
 128 }