OpenBSD-4.6/usr.bin/strings/strings.c
/* $OpenBSD: strings.c,v 1.14 2008/06/01 21:42:30 sobrado 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)strings.c 8.2 (Berkeley) 1/28/94";
#endif
static char rcsid[] = "$OpenBSD: strings.c,v 1.14 2008/06/01 21:42:30 sobrado Exp $";
#endif /* not lint */
#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);
}