usr.bin/more/option.c

/*
 * Copyright (c) 1988 Mark Nudleman
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)option.c    5.11 (Berkeley) 6/1/90";
#endif /* not lint */

#include <stdio.h>
#include <less.h>

int top_scroll;                 /* Repaint screen from top */
int bs_mode;                    /* How to process backspaces */
int caseless;                   /* Do "caseless" searches */
int cbufs = 10;                 /* Current number of buffers */
int linenums = 1;               /* Use line numbers */
int quit_at_eof;
int squeeze;                    /* Squeeze multiple blank lines into one */
int tabstop = 8;                /* Tab settings */
int tagoption;

char *firstsearch;
extern int sc_height;

option(argc, argv)
        int argc;
        char **argv;
{
        extern char *optarg;
        extern int optind;
        static int sc_window_set = 0;
        int ch;
        char *p;

        /* backward compatible processing for "+/search" */
        char **a;
        for (a = argv; *a; ++a)
                if ((*a)[0] == '+' && (*a)[1] == '/')
                        (*a)[0] = '-';

        optind = 1;             /* called twice, re-init getopt. */
        while ((ch = getopt(argc, argv, "0123456789/:ceinst:ux:f")) != EOF)
                switch((char)ch) {
                case '0': case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                        /*
                         * kludge: more was originally designed to take
                         * a number after a dash.
                         */
                        if (!sc_window_set) {
                                p = argv[optind - 1];
                                if (p[0] == '-' && p[1] == ch && !p[2])
                                        sc_height = atoi(++p);
                                else
                                        sc_height = atoi(argv[optind] + 1);
                                sc_window_set = 1;
                        }
                        break;
                case '/':
                        firstsearch = optarg;
                        break;
                case 'c':
                        top_scroll = 1;
                        break;
                case 'e':
                        quit_at_eof = 1;
                        break;
                case 'i':
                        caseless = 1;
                        break;
                case 'n':
                        linenums = 0;
                        break;
                case 's':
                        squeeze = 1;
                        break;
                case 't':
                        tagoption = 1;
                        findtag(optarg);
                        break;
                case 'u':
                        bs_mode = 1;
                        break;
                case 'x':
                        tabstop = atoi(optarg);
                        if (tabstop <= 0)
                                tabstop = 8;
                        break;
                case 'f':       /* ignore -f, compatability with old more */
                        break;
                case '?':
                default:
                        fprintf(stderr,
                            "usage: more [-ceinus] [-t tag] [-x tabs] [-/ pattern] [-#] [file ...]\n");
                        exit(1);
                }
        return(optind);
}