backward compatible processing for "+/pattern"

[unix-history] / usr / src / 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 are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Mark Nudleman and the University of California, Berkeley.  The
* name of Mark Nudleman or the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
static char sccsid[] = "@(#)option.c    5.7 (Berkeley) %G%";
#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;
int terseprompt;

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/:ceinpst:ux:")) != 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 'p':
                       terseprompt = 1;
                       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 '?':
               default:
                       fprintf(stderr,
                           "usage: less [-ceinpus] [-t tag] [-x tabs] [-/ pattern] [-#] [file ...]\n");
                       exit(1);
               }
       return(optind);
}