adds offset flag

src/hex.c

@@ -16,6 +16,8 @@ void init_flags(struct flags* flags)
 	flags->customcols = false;
 	flags->coloured = true;
 
+	flags->offset = 0;
+
 	flags->octets = 2;
 	flags->len = -1; // -1 means til EOF
 	flags->uppercase = false;
@@ -154,7 +156,7 @@ static void c_output(char** text, FILE* stream)
 void display_hex_chunk(hex_chunk_t* chunk, FILE* stream)
 {
 	if (!flags.postscript && !flags.c_style)
-		write_offset(chunk->line * flags.cols, stream);
+		write_offset((chunk->line * flags.cols) + flags.offset, stream);
 
 	if (flags.c_style)
 		c_output(&(chunk->hex), stream);

src/include/hex.h

@@ -26,6 +26,8 @@ struct flags {
 	
 	uint cols; // choose the amount of columns to display (default 16) // done
 	bool customcols;
+
+	uint offset;
 	
 	uint octets; // number of octets per line (default 2) // done
 	int len; // max len to stop at //done 

src/main.c

@@ -22,6 +22,7 @@ static struct argp_option options[] = {
 	{0, 'i', 0, 0, "output in C include file style.", 0},
 	{0, 'C', 0, 0, "capitalize variable names in C include file style (-i).", 0},
 	{0, 'n', "name", 0, "set the variable name used in C include output (-i).", 0},
+	{0, 'o', "off", 0, "add <off> to the displayed file position.", 0},
 	{0}
 };
 
@@ -42,6 +43,9 @@ static error_t parse_opt(int key, char* arg, struct argp_state* state)
 		case 'g':
 			flags->octets = atoi(arg);
 			break;
+		case 'o':
+			flags->offset = atoi(arg);
+			break;
 		case 'R':
 			if (strcmp(arg, "none") == 0)
 				flags->coloured = false;