xxd: implement -p

While at it, tweaked hexdump --help

function                                             old     new   delta
xxd_main                                             364     414     +50
packed_usage                                       31097   31114     +17

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 31 insertions, 18 deletions

diff --git a/util-linux/hexdump.c b/util-linux/hexdump.c
index a4483a1..25f7712 100644
--- a/util-linux/hexdump.c
+++ b/util-linux/hexdump.c
@@ -41,20 +41,21 @@
 //usage:       "[-bcCdefnosvx" IF_FEATURE_HEXDUMP_REVERSE("R") "] [FILE]..."
 //usage:#define hexdump_full_usage "\n\n"
 //usage:       "Display FILEs (or stdin) in a user specified format\n"
-//usage:     "\n	-b		One-byte octal display"
-//usage:     "\n	-c		One-byte character display"
-//usage:     "\n	-C		Canonical hex+ASCII, 16 bytes per line"
-//usage:     "\n	-d		Two-byte decimal display"
-//usage:     "\n	-e FORMAT_STRING"
+//usage:     "\n	-b		1-byte octal display"
+//usage:     "\n	-c		1-byte character display"
+//usage:     "\n	-d		2-byte decimal display"
+//usage:     "\n	-o		2-byte octal display"
+//usage:     "\n	-x		2-byte hex display"
+//usage:     "\n	-C		hex+ASCII 16 bytes per line"
+//usage:     "\n	-v		Show all (no dup folding)"
+//usage:     "\n	-e FORMAT_STR	Example: '16/1 \"%02x|\"\"\\n\"'"
 //usage:     "\n	-f FORMAT_FILE"
 // exactly the same help text lines in hexdump and xxd:
-//usage:     "\n	-n LENGTH	Interpret only LENGTH bytes of input"
-//usage:     "\n	-o		Two-byte octal display"
+//usage:     "\n	-n LENGTH	Show only first LENGTH bytes"
 //usage:     "\n	-s OFFSET	Skip OFFSET bytes"
-//usage:     "\n	-v		Display all input data"
-//usage:     "\n	-x		Two-byte hexadecimal display"
 //usage:	IF_FEATURE_HEXDUMP_REVERSE(
 //usage:     "\n	-R		Reverse of 'hexdump -Cv'")
+// TODO: NONCOMPAT!!! move -R to xxd -r
 //usage:
 //usage:#define hd_trivial_usage
 //usage:       "FILE..."
diff --git a/util-linux/hexdump_xxd.c b/util-linux/hexdump_xxd.c
index 813e7fe..cc34ea6 100644
--- a/util-linux/hexdump_xxd.c
+++ b/util-linux/hexdump_xxd.c
@@ -46,9 +46,11 @@
 //usage:       "Hex dump FILE (or stdin)\n"
 //usage:     "\n	-g N		Bytes per group"
 //usage:     "\n	-c N		Bytes per line"
+//usage:     "\n	-p		Show only hex bytes, assumes -c30"
 // exactly the same help text lines in hexdump and xxd:
-//usage:     "\n	-l LENGTH	Interpret only LENGTH bytes of input"
+//usage:     "\n	-l LENGTH	Show only first LENGTH bytes"
 //usage:     "\n	-s OFFSET	Skip OFFSET bytes"
+// TODO: implement -r (see hexdump -R)
 
 #include "libbb.h"
 #include "dump.h"
@@ -70,11 +72,12 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 #define OPT_l (1 << 0)
 #define OPT_s (1 << 1)
 #define OPT_a (1 << 2)
+#define OPT_p (1 << 3)
 	opt_complementary = "?1"; /* 1 argument max */
-	opt = getopt32(argv, "l:s:ag:+c:+", &opt_l, &opt_s, &bytes, &cols);
+	opt = getopt32(argv, "l:s:apg:+c:+", &opt_l, &opt_s, &bytes, &cols);
 	argv += optind;
 
-//	dumper->dump_vflag = ALL; // default
+	dumper->dump_vflag = ALL;
 //	if (opt & OPT_a)
 //		dumper->dump_vflag = SKIPNUL; ..does not exist
 	if (opt & OPT_l) {
@@ -93,9 +96,16 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 		//BUGGY for /proc/version (unseekable?)
 	}
 
-	bb_dump_add(dumper, "\"%08.8_ax: \""); // "address: "
-	if (cols == 0)
-		cols = 16;
+	if (opt & OPT_p) {
+		if (cols == 0)
+			cols = 30;
+		bytes = cols; /* -p ignores -gN */
+	} else {
+		if (cols == 0)
+			cols = 16;
+		bb_dump_add(dumper, "\"%08.8_ax: \""); // "address: "
+	}
+
 	if (bytes < 1 || bytes >= cols) {
 		sprintf(buf, "%u/1 \"%%02x\"", cols); // cols * "xx"
 		bb_dump_add(dumper, buf);
@@ -109,7 +119,7 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 #define BS "/1 \"%02x \""
 #define B  "/1 \"%02x\""
 		unsigned i;
-		char *bigbuf = xmalloc(1 + cols * (sizeof(BS)-1));
+		char *bigbuf = xmalloc(cols * (sizeof(BS)-1));
 		char *p = bigbuf;
 		for (i = 1; i <= cols; i++) {
 			if (i == cols || i % bytes)
@@ -125,8 +135,10 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 		free(bigbuf);
 	}
 
-	sprintf(buf, "\"  \"%u/1 \"%%_p\"\"\n\"", cols); // "  ASCII\n"
-	bb_dump_add(dumper, buf);
+	if (!(opt & OPT_p)) {
+		sprintf(buf, "\"  \"%u/1 \"%%_p\"\"\n\"", cols); // "  ASCII\n"
+		bb_dump_add(dumper, buf);
+	}
 
 	return bb_dump_dump(dumper, argv);
 }