1 files changed, 151 insertions, 0 deletions
diff --git a/util-linux/hexdump.c b/util-linux/hexdump.c
new file mode 100644
index 0000000..48edd70
--- /dev/null
+++ b/util-linux/hexdump.c
@@ -0,0 +1,151 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * hexdump implementation for busybox
+ * Based on code from util-linux v 2.11l
+ *
+ * Copyright (c) 1989
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Licensed under GPLv2 or later, see file License in this tarball for details.
+ */
+
+#include "libbb.h"
+#include "dump.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
+static void bb_dump_addfile(dumper_t *dumper, char *name)
+{
+	char *p;
+	FILE *fp;
+	char *buf;
+
+	fp = xfopen_for_read(name);
+	while ((buf = xmalloc_fgetline(fp)) != NULL) {
+		p = skip_whitespace(buf);
+		if (*p && (*p != '#')) {
+			bb_dump_add(dumper, p);
+		}
+		free(buf);
+	}
+	fclose(fp);
+}
+
+static const char *const add_strings[] = {
+	"\"%07.7_ax \" 16/1 \"%03o \" \"\\n\"",		/* b */
+	"\"%07.7_ax \" 16/1 \"%3_c \" \"\\n\"",		/* c */
+	"\"%07.7_ax \" 8/2 \"  %05u \" \"\\n\"",	/* d */
+	"\"%07.7_ax \" 8/2 \" %06o \" \"\\n\"",		/* o */
+	"\"%07.7_ax \" 8/2 \"   %04x \" \"\\n\"",	/* x */
+};
+
+static const char add_first[] ALIGN1 = "\"%07.7_Ax\n\"";
+
+static const char hexdump_opts[] ALIGN1 = "bcdoxCe:f:n:s:v" USE_FEATURE_HEXDUMP_REVERSE("R");
+
+static const struct suffix_mult suffixes[] = {
+	{ "b", 512 },
+	{ "k", 1024 },
+	{ "m", 1024*1024 },
+	{ }
+};
+
+int hexdump_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int hexdump_main(int argc, char **argv)
+{
+	dumper_t *dumper = alloc_dumper();
+	const char *p;
+	int ch;
+#if ENABLE_FEATURE_HEXDUMP_REVERSE
+	FILE *fp;
+	smallint rdump = 0;
+#endif
+
+	if (ENABLE_HD && !applet_name[2]) { /* we are "hd" */
+		ch = 'C';
+		goto hd_applet;
+	}
+
+	/* We cannot use getopt32: in hexdump options are cumulative.
+	 * E.g. "hexdump -C -C file" should dump each line twice */
+	while ((ch = getopt(argc, argv, hexdump_opts)) > 0) {
+		p = strchr(hexdump_opts, ch);
+		if (!p)
+			bb_show_usage();
+		if ((p - hexdump_opts) < 5) {
+			bb_dump_add(dumper, add_first);
+			bb_dump_add(dumper, add_strings[(int)(p - hexdump_opts)]);
+		}
+		/* Save a little bit of space below by omitting the 'else's. */
+		if (ch == 'C') {
+ hd_applet:
+			bb_dump_add(dumper, "\"%08.8_Ax\n\"");
+			bb_dump_add(dumper, "\"%08.8_ax  \" 8/1 \"%02x \" \"  \" 8/1 \"%02x \" ");
+			bb_dump_add(dumper, "\"  |\" 16/1 \"%_p\" \"|\\n\"");
+		}
+		if (ch == 'e') {
+			bb_dump_add(dumper, optarg);
+		} /* else */
+		if (ch == 'f') {
+			bb_dump_addfile(dumper, optarg);
+		} /* else */
+		if (ch == 'n') {
+			dumper->dump_length = xatoi_u(optarg);
+		} /* else */
+		if (ch == 's') {
+			dumper->dump_skip = xatoul_range_sfx(optarg, 0, LONG_MAX, suffixes);
+		} /* else */
+		if (ch == 'v') {
+			dumper->dump_vflag = ALL;
+		}
+#if ENABLE_FEATURE_HEXDUMP_REVERSE
+		if (ch == 'R') {
+			rdump = 1;
+		}
+#endif
+	}
+
+	if (!dumper->fshead) {
+		bb_dump_add(dumper, add_first);
+		bb_dump_add(dumper, "\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
+	}
+
+	argv += optind;
+
+#if !ENABLE_FEATURE_HEXDUMP_REVERSE
+	return bb_dump_dump(dumper, argv);
+#else
+	if (!rdump) {
+		return bb_dump_dump(dumper, argv);
+	}
+
+	/* -R: reverse of 'hexdump -Cv' */
+	fp = stdin;
+	if (!*argv) {
+		argv--;
+		goto jump_in;
+	}
+
+	do {
+		char *buf;
+		fp = xfopen_for_read(*argv);
+ jump_in:
+		while ((buf = xmalloc_fgetline(fp)) != NULL) {
+			p = buf;
+			while (1) {
+				/* skip address or previous byte */
+				while (isxdigit(*p)) p++;
+				while (*p == ' ') p++;
+				/* '|' char will break the line */
+				if (!isxdigit(*p) || sscanf(p, "%x ", &ch) != 1)
+					break;
+				putchar(ch);
+			}
+			free(buf);
+		}
+		fclose(fp);
+	} while (*++argv);
+
+	fflush_stdout_and_exit(EXIT_SUCCESS);
+#endif
+}