/*
 * This C module implements the cat and catino commands.
 */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include "types.h"
#include "struct.h"
#include "globals.h"
#include "pathname.h"

int cat_mode;

static u8 hex_buf[16];
static int hex_fill;
static u32 hex_offset;

cat_hex_flush()
{
	int i, c;

	printf("%08X:  ", hex_offset);
	for (i = 0; i < 16; i++) {
		if (i < hex_fill)
			printf("%02X ", hex_buf[i]);
		else
			fputs("   ", stdout);
		if (i == 7 || i == 15)
			putchar(' ');
	}
	for (i = 0; i < hex_fill; i++) {
		c = hex_buf[i];
		if (c < ' ' || c > '~')
			c = '.';
		putchar(c);
	}
	putchar('\n');
}

cat_hex_byte(inb)
{
	hex_buf[hex_fill++] = inb;
	if (hex_fill >= 16) {
		cat_hex_flush();
		hex_offset += hex_fill;
		hex_fill = 0;
	}
}

void
cat_chunk(ch)
	struct chunkinfo *ch;
{
	u8 *p;
	int c;

	if (!ch->len)
		return;
	switch (cat_mode) {
	case 0:
		write(1, ch->start, ch->len);
		return;
	case 1:
		for (p = ch->start; p < ch->end; p++) {
			c = *p;
			if (c >= ' ' && c <= '~' || c == '\n')
				putchar(c);
			else {
				if (c & 0x80) {
					putchar('M');
					putchar('-');
					c &= 0x7F;
				}
				putchar('^');
				if (c == 0x7F)
					putchar('?');
				else
					putchar(c + '@');
			}
		}
		return;
	case 2:
		for (p = ch->start; p < ch->end; p++)
			cat_hex_byte(*p);
		return;
	}
}

void
cat_finish()
{
	switch (cat_mode) {
	case 1:
		putchar('\n');
		return;
	case 2:
		if (hex_fill)
			cat_hex_flush();
		return;
	}
}

static void
segment_cat_callback(inf, opaque)
	struct inode_info *inf;
	u_long opaque;
{
	struct chunkinfo chi;

	size_extra_chunk(inf, &chi);
	cat_chunk(&chi);
}

cmd_cat(argc, argv)
	char **argv;
{
	extern int optind;
	int c, headino;
	struct inode_info *inf;
	struct chunkinfo chi;

	optind = 0;
	while ((c = getopt(argc, argv, "hv")) != EOF)
		switch (c) {
		case 'h':
			cat_mode = 2;
			continue;
		case 'v':
			cat_mode = 1;
			continue;
		default:
usage:			fprintf(stderr, "usage: cat [-v|-h] pathname\n");
			exit(1);
		}
	if (argc != optind + 1)
		goto usage;

	read_ffs_image();
	find_inode_block();
	alloc_inode_table();
	find_root_inode();

	headino = find_pathname(argv[optind]);
	inf = inode_info[headino];
	switch (inf->type) {
	case 0xE1:
	case 0xF1:
		break;
	case 0xF2:
		fprintf(stderr, "error: the requested object is a directory\n");
		exit(1);
	case 0xF3:
		fprintf(stderr,
"error: the requested object is a symlink; use readlink instead of cat\n");
		exit(1);
	default:
		fprintf(stderr, "error: unexpected object type %02X\n",
			inf->type);
		exit(1);
	}
	size_head_chunk(inf, &chi);
	cat_chunk(&chi);
	iterate_seg_file(headino, segment_cat_callback, 0L, 0, 0);
	cat_finish();
	exit(0);
}