>From 724382cf9aa173b6ced9fd213bbb369d9a5e3739 Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@xxxxxxxxxxxx>
Date: Sat, 17 Sep 2016 19:01:15 +0200
Subject: [PATCH 1/1] strings: new command
Implement a simple version of strings that will print
printable strings from one or more files.
Strings shall be at least 4 chars before thay are printed
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
---
I was in a situation where I missed "strings".
So here it is....
I started out with cat.c - but ended up re-writing everything.
It has seen light testing on my x86 box.
Ran it through checkpatch for good measure - fixed a few things.
The location in Makefile seems random, so I just put it next to cat.
Before applying please consider if strings is really
general useful in barebox.
Sam
commands/Kconfig | 10 +++++
commands/Makefile | 1 +
commands/strings.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 132 insertions(+)
create mode 100644 commands/strings.c
diff --git a/commands/Kconfig b/commands/Kconfig
index 30bf429..2f9b5d8 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -993,6 +993,16 @@ config CMD_SHA512SUM
Calculate a SHA512 digest over a FILE or a memory area.
+config CMD_STRINGS
+ tristate
+ default y
+ prompt "strings"
+ help
+ Display printable strings in file(s) to stdout
+
+ Usage: strings FILE...
+
+
config CMD_UNCOMPRESS
bool
select UNCOMPRESS
diff --git a/commands/Makefile b/commands/Makefile
index 601f15f..7b11d73 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_CMD_RMDIR) += rmdir.o
obj-$(CONFIG_CMD_CP) += cp.o
obj-$(CONFIG_CMD_RM) += rm.o
obj-$(CONFIG_CMD_CAT) += cat.o
+obj-$(CONFIG_CMD_STRINGS) += strings.o
obj-$(CONFIG_CMD_MOUNT) += mount.o
obj-$(CONFIG_CMD_UMOUNT) += umount.o
obj-$(CONFIG_CMD_REGINFO) += reginfo.o
diff --git a/commands/strings.c b/commands/strings.c
new file mode 100644
index 0000000..e1e7287
--- /dev/null
+++ b/commands/strings.c
@@ -0,0 +1,121 @@
+/*
+ * strings.c - find strings in a file
+ *
+ * Copyright (c) 2016 Sam Ravnborg <sam@xxxxxxxxxxxx>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ */
+
+#include <command.h>
+#include <fs.h>
+
+#include <linux/ctype.h>
+
+#define BUFSIZE (1024)
+#define STRINGBUF (1024 - 3)
+#define MIN_STRING 4
+
+/**
+ * @param[in] argc Argument count from command line
+ * @param[in] argv List of input arguments
+ */
+static int do_strings(int argc, char *argv[])
+{
+ char *string;
+ char *buf;
+ int args;
+ int err;
+ int ret;
+ int fd;
+ int i;
+ int s;
+
+ if (argc < 2) {
+ printf("strings: no file specified\n");
+ return 1;
+ }
+
+ buf = xmalloc(BUFSIZE);
+ /* Reserve room for newline + null */
+ string = xmalloc(STRINGBUF + 3);
+
+ args = 1;
+ err = 0;
+ s = 0;
+
+ while (args < argc) {
+ fd = open(argv[args], O_RDONLY);
+ if (fd < 0) {
+ err = 1;
+ printf("could not open %s: %s\n",
+ argv[args], errno_str());
+ goto out;
+ }
+
+ while ((ret = read(fd, buf, BUFSIZE)) > 0) {
+ for (i = 0; i < ret; i++) {
+ int nonprint = 0;
+
+ if (isascii(buf[i]) && isprint(buf[i]))
+ string[s++] = buf[i];
+ else
+ nonprint = 1;
+
+ if (nonprint) {
+ if (s >= MIN_STRING || s >= STRINGBUF) {
+ string[s++] = '\n';
+ string[s++] = '\0';
+ puts(string);
+ }
+
+ s = 0;
+ }
+ }
+
+ if (s >= MIN_STRING) {
+ string[s++] = '\n';
+ string[s++] = '\0';
+ puts(string);
+ }
+ s = 0;
+
+ if (ctrlc()) {
+ err = 1;
+ close(fd);
+ goto out;
+ }
+ }
+
+ close(fd);
+ args++;
+ }
+
+out:
+ free(string);
+ free(buf);
+
+ return err;
+}
+
+BAREBOX_CMD_HELP_START(strings)
+BAREBOX_CMD_HELP_TEXT("Display strings from a file")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(strings)
+ .cmd = do_strings,
+ BAREBOX_CMD_DESC("display strings")
+ BAREBOX_CMD_OPTS("FILE...")
+ BAREBOX_CMD_GROUP(CMD_GRP_FILE)
+ BAREBOX_CMD_HELP(cmd_strings_help)
+BAREBOX_CMD_END
--
1.8.3.1
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