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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: strings.c,v 1.15 2009/10/27 23:59:43 deraadt Exp $	*/
/*	$NetBSD: strings.c,v 1.7 1995/02/15 15:49:19 jtc Exp $	*/

/*
 * Copyright (c) 1980, 1987, 1993
 *	The 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. 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.
 */

#include <sys/types.h>

#include <a.out.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <unistd.h>
#include <err.h>

#define FORMAT_DEC "%07ld "
#define FORMAT_OCT "%07lo "
#define FORMAT_HEX "%07lx "

#define DEF_LEN		4		/* default minimum string length */
#define ISSTR(ch)	(isascii(ch) && (isprint(ch) || ch == '\t'))

typedef struct exec	EXEC;		/* struct exec cast */

static long	foff;			/* offset in the file */
static int	hcnt,			/* head count */
		head_len,		/* length of header */
		read_len;		/* length to read */
static u_char	hbfr[sizeof(EXEC)];	/* buffer for struct exec */

static void usage(void);
int getch(void);

int
main(int argc, char *argv[])
{
	extern char *optarg;
	extern int optind;
	int ch, cnt;
	u_char *C;
	EXEC *head;
	int exitcode, minlen, maxlen, bfrlen;
	short asdata, fflg;
	u_char *bfr;
	char *file, *p;
	char *offset_format;

	setlocale(LC_ALL, "");

	/*
	 * for backward compatibility, allow '-' to specify 'a' flag; no
	 * longer documented in the man page or usage string.
	 */
	asdata = exitcode = fflg = 0;
	offset_format = NULL;
	minlen = -1;
	maxlen = -1;
	while ((ch = getopt(argc, argv, "0123456789an:m:oft:-")) != -1)
		switch((char)ch) {
		case '0': case '1': case '2': case '3': case '4':
		case '5': case '6': case '7': case '8': case '9':
			/*
			 * kludge: strings was originally designed to take
			 * a number after a dash.
			 */
			if (minlen == -1) {
				p = argv[optind - 1];
				if (p[0] == '-' && p[1] == ch && !p[2])
					minlen = atoi(++p);
				else
					minlen = atoi(argv[optind] + 1);
			}
			break;
		case '-':
		case 'a':
			asdata = 1;
			break;
		case 'f':
			fflg = 1;
			break;
		case 'n':
			minlen = atoi(optarg);
			break;
		case 'm':
			maxlen = atoi(optarg);
			break;
		case 'o':
			offset_format = FORMAT_OCT;
			break;
		case 't':
			switch (*optarg) {
			case 'o':
			        offset_format = FORMAT_OCT;
				break;
			case 'd':
				offset_format = FORMAT_DEC;
				break;
			case 'x':
				offset_format = FORMAT_HEX;
				break;
			default:
				usage();
				/* NOTREACHED */
			}
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (minlen == -1)
		minlen = DEF_LEN;
	else if (minlen < 1)
		errx(1, "length less than 1");
	if (maxlen != -1 && maxlen < minlen)
		errx(1, "max length less than min");
	bfrlen = maxlen == -1 ? minlen : maxlen;
	bfr = malloc(bfrlen + 1);
	if (!bfr)
		err(1, "malloc");
	bfr[bfrlen] = '\0';
	file = "stdin";
	do {
		if (*argv) {
			file = *argv++;
			if (!freopen(file, "r", stdin)) {
				warn("%s", file);
				exitcode = 1;
				goto nextfile;
			}
		}
		foff = 0;
#define DO_EVERYTHING()		{read_len = -1; head_len = 0; goto start;}
		read_len = -1;
		if (asdata)
			DO_EVERYTHING()
		else {
			head = (EXEC *)hbfr;
			if ((head_len =
			    read(fileno(stdin), head, sizeof(EXEC))) == -1)
				DO_EVERYTHING()
			if (head_len == sizeof(EXEC) && !N_BADMAG(*head)) {
				foff = N_TXTOFF(*head);
				if (fseek(stdin, foff, SEEK_SET) == -1)
					DO_EVERYTHING()
				read_len = head->a_text + head->a_data;
				head_len = 0;
			}
			else
				hcnt = 0;
		}
start:
		for (cnt = 0, C = bfr; (ch = getch()) != EOF;) {
			if (ISSTR(ch)) {
				*C++ = ch;
				if (++cnt < minlen)
					continue;
				if (maxlen != -1) {
					while ((ch = getch()) != EOF &&
					       ISSTR(ch) && cnt++ < maxlen)
						*C++ = ch;
					if (ch == EOF ||
					    (ch != 0 && ch != '\n')) {
						/* get all of too big string */
						while ((ch = getch()) != EOF &&
						       ISSTR(ch))
							;
						ungetc(ch, stdin);
						goto out;
					}
					*C = 0;
				}

				if (fflg)
					printf("%s:", file);

				if (offset_format) 
					printf(offset_format, foff - minlen);

				printf("%s", bfr);
				
				if (maxlen == -1)
					while ((ch = getch()) != EOF &&
					       ISSTR(ch))
						putchar((char)ch);
				putchar('\n');
			out:
				;
			}
			cnt = 0;
			C = bfr;
		}
nextfile: ;
	} while (*argv);
	exit(exitcode);
}

/*
 * getch --
 *	get next character from wherever
 */
int
getch(void)
{
	++foff;
	if (head_len) {
		if (hcnt < head_len)
			return((int)hbfr[hcnt++]);
		head_len = 0;
	}
	if (read_len == -1 || read_len-- > 0)
		return(getchar());
	return(EOF);
}

static void
usage(void)
{
	(void)fprintf(stderr,
	    "usage: strings [-afo] [-m number] [-n number] [-t radix] [file ...]\n");
	exit(1);
}