From f003e64412000cd7cb3e22796ab255272fbce51c Mon Sep 17 00:00:00 2001
From: SuperNovaa41 <supernovaa41@gmx.com>
Date: Fri, 7 Feb 2025 12:23:19 -0500
Subject: [PATCH] implements options

---
 src/hex.c         |  6 ++--
 src/include/hex.h |  3 +-
 src/main.c        | 76 +++++++++++++++++++++++++++++++++++++----------
 3 files changed, 66 insertions(+), 19 deletions(-)

diff --git a/src/hex.c b/src/hex.c
index b2fddc4..c5d422b 100644
--- a/src/hex.c
+++ b/src/hex.c
@@ -9,8 +9,9 @@ extern struct flags flags;
 
 void init_flags(struct flags* flags)
 {
-	flags->autoskip = false;
-	flags->binary = false;
+	flags->files[0] = NULL;
+	flags->files[1] = NULL;	
+
 	flags->cols = 16;
 	flags->octets = 2;
 	flags->len = -1; // -1 means til EOF
@@ -51,6 +52,7 @@ void display_hex_chunk(hex_chunk_t* chunk, FILE* stream)
 {
 	uint i, j;
 	bool newline;
+
 	if (flags.decimaloffset)
 		fprintf(stream, "%08d", chunk->line * flags.cols);
 	else
diff --git a/src/include/hex.h b/src/include/hex.h
index d0ec815..d6a77ce 100644
--- a/src/include/hex.h
+++ b/src/include/hex.h
@@ -19,8 +19,7 @@ typedef struct {
 } hex_chunk_t;
 
 struct flags {
-	bool autoskip; // should we condense null lines into *
-	bool binary; // do binary dump instead of hex
+	char* files[2];
 	uint cols; // choose the amount of columns to display (default 16) // done
 	
 	uint octets; // number of octets per line (default 2) // done
diff --git a/src/main.c b/src/main.c
index c174f19..0982040 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,10 +2,60 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
+#include <argp.h>
 
 #include "include/hex.h"
 #include "include/file.h"
 
+const char* argp_program_version = "xxd 0.1";
+const char* argp_program_bug_address = "supernovaa41@gmx.com";
+static char doc[] = "Creates a hex dump of the given file.";
+static char args_doc[] = "[INFILE] ([OUTFILE])";
+static struct argp_option options[] = {
+	{"cols", 'c', "cols", 0, "format <cols> octets per line. Default 16.", 0},
+	{"octets", 'g', "bytes", 0, "number of octets per group in normal output. Default 2.", 0},
+	{"len", 'l', "len", 0, "stop after <len> octets.", 0},
+	{"uppercase", 'u', 0, 0, "use upper case hex letters.", 0},
+	{"decimaloffset", 'd', 0, 0, "show offset in decimal instead of hex.", 0},
+	{0}
+};
+
+static error_t parse_opt(int key, char* arg, struct argp_state* state)
+{
+	struct flags* flags = state->input;
+	switch(key) {
+		case 'c':
+			flags->cols = atoi(arg);
+			break;
+		case 'g':
+			flags->octets = atoi(arg);
+			break;
+		case 'l':
+			flags->len = atoi(arg);
+			break;
+		case 'u':
+			flags->uppercase = true;
+			break;
+		case 'd':
+			flags->decimaloffset = true;
+			break;
+		case ARGP_KEY_ARG:
+			if (state->arg_num >= 2)
+				argp_usage(state);
+			flags->files[state->arg_num] = arg;
+			break;
+		case ARGP_KEY_END:
+			if (state->arg_num < 1)
+				argp_usage(state);
+			break;
+		default:
+			return ARGP_ERR_UNKNOWN;
+	}
+	return 0;
+}
+
+static struct argp argp = {options, parse_opt, args_doc, doc, 0, 0, 0};
+
 struct flags flags;
 
 int get_hex_lines(int len)
@@ -29,25 +79,21 @@ int main(int argc, char* argv[])
 
 	init_flags(&flags);
 
+	argp_parse(&argp, argc, argv, 0, 0, &flags);
 
-	if (argc < 2) {
-		fprintf(stderr, "Usage: %s [filename]\n", argv[0]);
-		return EXIT_FAILURE;
-	}
-
-	stream = stdout;
-	outfile = false;
-	if (argc == 3) {
-		stream = fopen(argv[2], "w");
-		outfile = true;
-	}
-
-	read_file_to_buf(argv[1], &file_content);
-
+	read_file_to_buf(flags.files[0], &file_content);
 	filesize = (flags.len == -1) ? strlen(file_content) : flags.len;
-	
 	hex_lines = get_hex_lines(filesize);
 
+	outfile = false;
+	if (flags.files[1] != NULL) {
+		stream = fopen(flags.files[1], "w");
+		outfile = true;
+	} else {
+	 	stream = stdout;
+	}
+
+
 	hex_chunk_t* lines = malloc(sizeof(hex_chunk_t) * hex_lines);
 
 	for (i = 0; i < hex_lines; i++) {