/* 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 "busybox.h"
#include <getopt.h>
#include "dump.h"

static void bb_dump_addfile(char *name)
{
	char *p;
	FILE *fp;
	char *buf;

	fp = xfopen(name, "r");

	while ((buf = xmalloc_getline(fp)) != NULL) {
		p = skip_whitespace(buf);

		if (*p && (*p != '#')) {
			bb_dump_add(p);
		}
		free(buf);
	}
	fclose(fp);
}

/* An initial string   add_fmthead = "\"%07.7_ax \" "
 * is common to all these format strings */

static const char * const add_strings[] = {
	"16/1 \"%03o \" \"\\n\"",		/* b */
	"16/1 \"%3_c \" \"\\n\"",		/* c */
	"8/2 \"  %05u \" \"\\n\"",		/* d */
	"8/2 \" %06o \" \"\\n\"",		/* o */
	"8/2 \"   %04x \" \"\\n\"",		/* x */
};
static const char *add_fmthead = "\"%07.7_ax \" ";
static const char *add_first = "\"%07.7_Ax\n\"";

enum {
	OPT_b	= 0x1,	// OPT_b ... OPT_x are implicitely used
	OPT_c	= 0x2,	// as values of 'oflg' inside a for loop
	OPT_d	= 0x4,	// in hexdump_main.
	OPT_o	= 0x8,	//
	OPT_x	= 0x10, // Therefore this printing order is fixed due to getopt32
	OPT_C	= 0x20,
	OPT_e	= 0x40,
	OPT_f	= 0x80,
	OPT_n	= 0x100,
	OPT_s	= 0x200,
	OPT_v	= 0x400,
};

static const struct suffix_mult suffixes[] = {
	{"b",  512 },
	{"k",  1024 },
	{"m",  1024*1024 },
	{NULL, 0 }
};

int hexdump_main(int argc, char **argv);
int hexdump_main(int argc, char **argv)
{
	unsigned ch;
	char * e_arg; 
	char * f_arg;
	char * n_arg;
	char * s_arg;
	int pcnt, oflg;

	bb_dump_vflag = FIRST;
	bb_dump_length = -1;

	ch = getopt32(argc, argv, "bcdoxCe:f:n:s:v", // hexdump_opts,
			&e_arg, &f_arg, &n_arg, &s_arg);

	for (pcnt=0, oflg=1; pcnt < 5; pcnt++, oflg <<= 1) {
		if (ch & oflg) {
			bb_dump_add(add_first);
			bb_dump_add(add_fmthead);
			bb_dump_add(add_strings[pcnt]);
		}
	}

	if (ch & OPT_C) {
		bb_dump_add("\"%08.8_Ax\n\"");
		bb_dump_add("\"%08.8_ax  \" 8/1 \"%02x \" \"  \" 8/1 \"%02x \" ");
		bb_dump_add("\"  |\" 16/1 \"%_p\" \"|\\n\"");
	}
	
	if (ch & OPT_e) {
		bb_dump_add(e_arg);
	}

	if (ch & OPT_f) {
		bb_dump_addfile(f_arg);
	}

	if (ch & OPT_n) {
		bb_dump_length = xatoi_u(n_arg);
	}
	
	if (ch & OPT_s) {
		bb_dump_skip = xatoul_range_sfx(s_arg, 0, LONG_MAX, suffixes);
	}

	if (ch & OPT_v) {
		bb_dump_vflag = ALL;
	}

	if (!bb_dump_fshead) {
/* Great losses when converting this to use  add_fthead  instead. Unfortunately! */
		bb_dump_add(add_first);
		bb_dump_add("\"%07.7_ax \" 8/2 \"%04x \" \"\\n\"");
	}

	argv += optind;

	return bb_dump_dump(argv);
}