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.
+ */