Implement a small strings applet

5 files changed, 156 insertions, 0 deletions

diff --git a/include/applets.h b/include/applets.h
index 1660b11c5..e41a48996 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -440,6 +440,9 @@
 #ifdef CONFIG_START_STOP_DAEMON
     APPLET_ODDNAME("start-stop-daemon", start_stop_daemon_main, _BB_DIR_SBIN, _BB_SUID_NEVER, start_stop_daemon)
 #endif
+#ifdef CONFIG_STRINGS
+	APPLET(strings, strings_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
+#endif
 #ifdef CONFIG_STTY
 	APPLET(stty, stty_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
diff --git a/include/usage.h b/include/usage.h
index b66d96402..b49f3869b 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1681,6 +1681,15 @@
 	"-s <signal>\t\tsignal to send (default 15)\n"\
 	"-a <pathname>\t\tprogram to start (default <executable>)\n"
 
+#define strings_trivial_usage \
+    "[-afo] [-n length] [file ... ]"
+#define strings_full_usage \
+    "Display printable strings in a binary file." \
+    "\n\nOptions:" \
+    "\n\t-f\tPrecede each string with the name of the file where it was found." \
+    "\n\t-n N\tSpecifies that at least N characters forms a sequence (default 4)" \
+    "\n\t-o\tEach string is preceded by its decimal offset in the file."
+
 #define stty_trivial_usage \
 	"[-a|g] [-F DEVICE] [SETTING]..."
 #define stty_full_usage \
diff --git a/miscutils/Makefile.in b/miscutils/Makefile.in
index a5e12e7ee..72292b69d 100644
--- a/miscutils/Makefile.in
+++ b/miscutils/Makefile.in
@@ -33,6 +33,7 @@ MISCUTILS-$(CONFIG_MAKEDEVS)		+= makedevs.o
 MISCUTILS-$(CONFIG_MKTEMP)		+= mktemp.o
 MISCUTILS-$(CONFIG_MT)			+= mt.o
 MISCUTILS-$(CONFIG_READLINK)		+= readlink.o
+MISCUTILS-$(CONFIG_STRINGS)		+= strings.o
 MISCUTILS-$(CONFIG_TIME)		+= time.o
 MISCUTILS-$(CONFIG_UPDATE)		+= update.o
 MISCUTILS-$(CONFIG_WATCHDOG)		+= watchdog.o
diff --git a/miscutils/config.in b/miscutils/config.in
index 1d2751444..3dc5e2c8b 100644
--- a/miscutils/config.in
+++ b/miscutils/config.in
@@ -15,6 +15,7 @@ bool 'makedevs'	    CONFIG_MAKEDEVS
 bool 'mktemp'	    CONFIG_MKTEMP
 bool 'mt'	    CONFIG_MT
 bool 'readlink'	    CONFIG_READLINK
+bool 'strings'	    CONFIG_STRINGS
 bool 'time'	    CONFIG_TIME
 bool 'update'	    CONFIG_UPDATE
 bool 'watchdog'	    CONFIG_WATCHDOG
diff --git a/miscutils/strings.c b/miscutils/strings.c
new file mode 100644
index 000000000..043d6b8c1
--- /dev/null
+++ b/miscutils/strings.c
@@ -0,0 +1,142 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * strings implementation for busybox
+ *
+ * Copyright (c) 1980, 1987
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Original copyright notice is retained at the end of this file.
+ *
+ * Modified for BusyBox by Erik Andersen <andersee@debian.org>
+ */
+
+#include <stdio.h> 
+#include <stdlib.h> 
+#include <string.h> 
+#include <getopt.h> 
+#include <unistd.h>
+#include <ctype.h>
+#include "busybox.h"
+
+#define ISSTR(ch)	(isprint(ch) || ch == '\t')
+
+int strings_main(int argc, char **argv) 
+{
+	extern char *optarg;
+	extern int optind;
+	int ch, cnt;
+	int exitcode;
+	int oflg, fflg;
+	char *file;
+	size_t foff, minlen;
+	unsigned char *bfr, *C;
+
+
+	exitcode = fflg = oflg = 0;
+	minlen = -1;
+	while ((ch = getopt(argc, argv, "an:of")) > 0)
+		switch(ch) {
+			case '-':
+				break;
+			case 'f':
+				fflg = 1;
+				break;
+			case 'n':
+				minlen = atoi(optarg);
+				break;
+			case 'o':
+				oflg = 1;
+				break;
+			default:
+				show_usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (minlen == -1)
+		minlen = 4;
+
+	bfr = xmalloc(minlen);
+	bfr[minlen] = '\0';
+	file = "stdin";
+	do {
+		if (*argv) {
+			fprintf(stderr, "opening '%s'\n", *argv);
+			file = *argv++;
+			if (!freopen(file, "r", stdin)) {
+				perror_msg("%s", file);
+				exitcode = EXIT_FAILURE;
+				continue;
+			}
+		}
+		foff = 0;
+
+		for (cnt = 0; (ch = getchar()) != EOF;) {
+			if (ISSTR(ch)) {
+				if (!cnt)
+					C = bfr;
+				*C++ = ch;
+				if (++cnt < minlen)
+					continue;
+				if (fflg)
+					printf("%s:", file);
+				if (oflg)
+					printf("%07ld %s", (long)(foff - minlen), (char *)bfr);
+				else
+					printf("%s", bfr);
+				while ((ch = getchar()) != EOF && ISSTR(ch))
+					putchar((char)ch);
+				putchar('\n');
+			}
+			cnt = 0;
+		}
+	} while (*argv);
+	exit(exitcode);
+}
+
+/*
+ * Copyright (c) 1980, 1987
+ *	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. <BSD Advertising Clause omitted per the July 22, 1999 licensing change 
+ *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change> 
+ *
+ * 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.
+ */