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Initial checkin of the GNO v2.0.4 strings(1) util. No changes yet for
GNO v2.0.6, other than a GNO-formatted man page was created from the BSD original.
This commit is contained in:
gdr-ftp
parent
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commit
ade81f0a94
5
bin/strings/Makefile
Normal file
5
bin/strings/Makefile
Normal file
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strings.a: strings.c
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compile strings.c keep=strings
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strings: strings.a
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link strings 2/direct256 keep=strings
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96
bin/strings/strings.1
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96
bin/strings/strings.1
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.\" Copyright (c) 1980, 1990 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)strings.1 6.11 (Berkeley) 5/9/91
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.\"
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.Dd May 9, 1991
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.Dt STRINGS 1
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.Os BSD 3
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.Sh NAME
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.Nm strings
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.Nd find printable strings in a file
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.Sh SYNOPSIS
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.Nm strings
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.Op Fl afo
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.Op Fl n Ar number
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.Op Ar file ...
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.Sh DESCRIPTION
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.Nm Strings
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displays the sequences of printable characters in each of the specified
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files, or in the standard input, by default.
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By default, a sequence must be at least four characters in length
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before being displayed.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl a
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By default,
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.Nm strings
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only searches the text and data segments of object files.
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The
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.Fl a
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option causes
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.Nm strings
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to search the entire object file.
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.It Fl f
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Each string is preceded by the name of the file
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in which it was found.
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.It Fl n
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Specifies the minimum number of characters in a sequence to be
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.Ar number ,
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instead of four.
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.It Fl o
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Each string is preceded by its decimal offset in the
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file.
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.El
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.Pp
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.Nm Strings
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is useful for identifying random binaries, among other things.
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.Sh SEE ALSO
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.Xr hexdump 1
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.Sh BUGS
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The algorithm for identifying strings is extremely primitive.
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In particular, machine code instructions on certain architectures
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can resemble sequences of ASCII bytes, which
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will fool the algorithm.
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.Sh COMPATIBILITY
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Historic implementations of
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.Nm
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only search the initialized data portion of the object file.
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This was reasonable as strings were normally stored there.
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Given new compiler technology which installs strings in the
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text portion of the object file, the default behavior was
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changed.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 3.0 .
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89
bin/strings/strings.1G
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89
bin/strings/strings.1G
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@ -0,0 +1,89 @@
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.\" Copyright (c) 1980, 1990 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)strings.1 6.11 (Berkeley) 5/9/91
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.\"
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.TH STRINGS 1 "9 May 1991" GNO "Commands and Applications"
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.SH NAME
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.BR strings
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\- find printable strings in a file
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.SH SYNOPSIS
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.BR strings
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.RB [ -afo ]
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.RB [ -n
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.IR number ]
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.RI [ "file ..." ]
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.SH DESCRIPTION
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.BR Strings
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displays the sequences of printable characters in each of the specified
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files, or in the standard input, by default.
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By default, a sequence must be at least four characters in length
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before being displayed.
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.LP
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.BR Strings
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is useful for identifying random binaries, among other things.
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.SH OPTIONS
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.IP \fB-a\fR
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By default,
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.BR strings
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only searches the text and data segments of object files. The
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.BR \-a
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option causes
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.BR strings
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to search the entire object file.
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.IP \fB-f\fR
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Each string is preceded by the name of the file in which it was found.
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.IP \fB-n\fR
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Specifies the minimum number of characters in a sequence to be
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.BR number ,
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instead of four.
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.IP \fB-o\fR
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Each string is preceded by its decimal offset in the
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file.
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.SH SEE ALSO
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.BR hexdump (1)
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.SH BUGS
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The algorithm for identifying strings is extremely primitive.
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In particular, machine code instructions on certain architectures
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can resemble sequences of ASCII bytes, which
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will fool the algorithm.
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.SH COMPATIBILITY
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Historic implementations of
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.BR strings
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only search the initialized data portion of the object file.
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This was reasonable as strings were normally stored there.
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Given new compiler technology which installs strings in the
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text portion of the object file, the default behavior was
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changed.
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.SH HISTORY
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The
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.BR strings
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command appeared in 3.0 BSD.
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96
bin/strings/strings.c
Normal file
96
bin/strings/strings.c
Normal file
@ -0,0 +1,96 @@
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#pragma stacksize 1024
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#include <types.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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const long bufSize = 512l;
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int all;
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int myprint(char c)
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{
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if (all) {
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if (isprint(c) || (c==9)) return 1;
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} else {
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if ( ((c>64) && (c<91)) || ((c>96) && (c<123)) || ((c>47) && (c<58))
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|| (c==32) || (c==9) ) return 1;
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}
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return 0;
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}
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main(int argc,char **argv)
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{
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FILE *duh;
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int concur,c,errflg = 0,size,pos;
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int inRow = 4,keepOff = FALSE;
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unsigned char *buffer,*string;
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unsigned long stringSize = 256l,offSet;
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extern char *optarg;
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extern int optind;
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extern int getopt(int,char **,char*);
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/* optarg = NULL; optind = 0; */ /* this makes getopt restartable */
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all = FALSE;
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while ((c = getopt(argc,argv, "c:na")) != EOF) {
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switch (c) {
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case 'c' :
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inRow = atoi(optarg);
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break;
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case 'n' :
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keepOff = TRUE;
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break;
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case 'a' :
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all = TRUE;
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break;
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default : errflg++;
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}
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}
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if (errflg) {
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fprintf(stderr,"usage: strings [-a] [-c #chars] [-n] files...\n");
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exit(2);
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}
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if (inRow < 4) inRow = 4;
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printf("optind: %d argc: %d\n",optind,argc);
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argv += optind;
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buffer = (unsigned char *)malloc(bufSize);
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string = (unsigned char *)malloc(stringSize);
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if (optind == argc) {
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duh = stdin;
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goto action;
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}
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for (;optind<argc;optind++) {
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if ((duh = fopen(*argv,"rb")) == NULL) {
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fprintf(stderr,"error opening %s\n",*argv);
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exit(1);
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}
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argv++;
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action: concur = 0;
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offSet = 0l;
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while (!feof(duh)) {
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size = fread(buffer,sizeof(unsigned char),bufSize,duh);
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for (pos = 0;pos < size;pos++,offSet++) {
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if (myprint(c=toascii(buffer[pos]))) {
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string[concur] = c;
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if (concur++ > stringSize) {
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stringSize += 256l;
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if ((string = realloc(string,stringSize)) == NULL)
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exit(2);
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}
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} else if ((isspace(c) || !c) && (concur >= inRow)) {
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string[concur] = 0;
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if (keepOff) printf("%6.6lX : ",offSet);
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printf("%s\n",string);
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concur = 0;
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} else {
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concur = 0;
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}
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}
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}
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fclose(duh);
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}
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free(buffer);
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free(string);
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exit(0);
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}
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