xxd: implement -i "C style output"

function                                             old     new   delta
xxd_main                                             710     888    +178
.rodata                                           103252  103331     +79
print_C_style                                          -      78     +78
packed_usage                                       33639   33652     +13
next                                                 276     278      +2
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/0 up/down: 350/0)             Total: 350 bytes

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

1 files changed, 38 insertions, 11 deletions

diff --git a/util-linux/hexdump_xxd.c b/util-linux/hexdump_xxd.c
index 817250c69..aa215569f 100644
--- a/util-linux/hexdump_xxd.c
+++ b/util-linux/hexdump_xxd.c
@@ -41,12 +41,13 @@
 //    -u          use upper case hex letters.
 
 //usage:#define xxd_trivial_usage
-//usage:       "[-pr] [-g N] [-c N] [-n LEN] [-s OFS] [-o OFS] [FILE]"
+//usage:       "[-pri] [-g N] [-c N] [-n LEN] [-s OFS] [-o OFS] [FILE]"
 //usage:#define xxd_full_usage "\n\n"
 //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"
+//usage:     "\n	-i		C include file style"
 // exactly the same help text lines in hexdump and xxd:
 //usage:     "\n	-l LENGTH	Show only first LENGTH bytes"
 //usage:     "\n	-s OFFSET	Skip OFFSET bytes"
@@ -62,10 +63,11 @@
 #define OPT_s (1 << 1)
 #define OPT_a (1 << 2)
 #define OPT_p (1 << 3)
-#define OPT_r (1 << 4)
-#define OPT_g (1 << 5)
-#define OPT_c (1 << 6)
-#define OPT_o (1 << 7)
+#define OPT_i (1 << 4)
+#define OPT_r (1 << 5)
+#define OPT_g (1 << 6)
+#define OPT_c (1 << 7)
+#define OPT_o (1 << 8)
 
 static void reverse(unsigned opt, unsigned cols, const char *filename)
 {
@@ -126,6 +128,15 @@ static void reverse(unsigned opt, unsigned cols, const char *filename)
 	fflush_stdout_and_exit(EXIT_SUCCESS);
 }
 
+static void print_C_style(const char *p, const char *hdr)
+{
+	printf(hdr, isdigit(p[0]) ? "__" : "");
+	while (*p) {
+		bb_putchar(isalnum(*p) ? *p : '_');
+		p++;
+	}
+}
+
 int xxd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int xxd_main(int argc UNUSED_PARAM, char **argv)
 {
@@ -135,10 +146,11 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 	unsigned bytes = 2;
 	unsigned cols = 0;
 	unsigned opt;
+	int r;
 
 	dumper = alloc_dumper();
 
-	opt = getopt32(argv, "^" "l:s:aprg:+c:+o:" "\0" "?1" /* 1 argument max */,
+	opt = getopt32(argv, "^" "l:s:apirg:+c:+o:" "\0" "?1" /* 1 argument max */,
 			&opt_l, &opt_s, &bytes, &cols, &opt_o
 	);
 	argv += optind;
@@ -173,8 +185,11 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 		bytes = cols; /* -p ignores -gN */
 	} else {
 		if (cols == 0)
-			cols = 16;
-		bb_dump_add(dumper, "\"%08.8_ax: \""); // "address: "
+			cols = (opt & OPT_i) ? 12 : 16;
+		if (opt & OPT_i)
+			bytes = 1; /* -i ignores -gN */
+		else
+			bb_dump_add(dumper, "\"%08.8_ax: \""); // "address: "
 	}
 
 	if (opt & OPT_r) {
@@ -186,7 +201,10 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 		bb_dump_add(dumper, buf);
 	}
 	else if (bytes == 1) {
-		sprintf(buf, "%u/1 \"%%02x \"", cols); // cols * "xx "
+		if (opt & OPT_i)
+			sprintf(buf, "%u/1 \" 0x%%02x,\"", cols); // cols * " 0xxx,"
+		else
+			sprintf(buf, "%u/1 \"%%02x \"", cols); // cols * "xx "
 		bb_dump_add(dumper, buf);
 	}
 	else {
@@ -210,7 +228,7 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 		free(bigbuf);
 	}
 
-	if (!(opt & OPT_p)) {
+	if (!(opt & (OPT_p|OPT_i))) {
 		sprintf(buf, "\"  \"%u/1 \"%%_p\"\"\n\"", cols); // "  ASCII\n"
 		bb_dump_add(dumper, buf);
 	} else {
@@ -218,5 +236,14 @@ int xxd_main(int argc UNUSED_PARAM, char **argv)
 		dumper->xxd_eofstring = "\n";
 	}
 
-	return bb_dump_dump(dumper, argv);
+	if ((opt & OPT_i) && argv[0]) {
+		print_C_style(argv[0], "unsigned char %s");
+		printf("[] = {\n");
+	}
+	r = bb_dump_dump(dumper, argv);
+	if (r == 0 && (opt & OPT_i) && argv[0]) {
+		print_C_style(argv[0], "};\nunsigned int %s");
+		printf("_len = %"OFF_FMT"u;\n", dumper->address);
+	}
+	return r;
 }