hview.c

hex editor for editing all files

/*
 * hview.c
 * 
 *        Author: David Scott
 *  Date Started: 25-Aug-2000
 * 
 *  Modification history:
 *
 *  .000830  initial beta release
 */

#include <curses.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "hview.h"

/* 
 * main
 * input: argument count 
 *        argument vector  
 */

int main( int argc, char *argv[] )
{

	WINDOW *wp;
	
	wp = setupscr();
	process( wp, argc, ++argv );
	return( endscr() );	

}

/* 
 * setup window and all globals 
 */

WINDOW *setupscr()
{

	WINDOW *wp;

	wp = initscr();
	cbreak();

	getmaxyx(wp, screen_y, screen_x);

	buffer = malloc(screen_y*16*sizeof(int));

	keypad(wp, TRUE);
	color = has_colors();
	return wp;


}

/* 
 * end screen 
 * output: return value of endwin
 */

int endscr()
{
	free(buffer);
	return(endwin());
}

/* 
 * process the file and 
 * input: pointer to current window 
 *        argument count 
 *        argument vector
 * 
 * currently I only handle the first arg so 
 * argc is unused, but in the future I may add
 * a way to process multiple files, so I'm leaving
 * it in.
 */

int process( WINDOW *wp, int argc, char *argv[] )
{

	FILE *in;
	struct stat statbuf;

	if( (in = fopen( argv[0], "r+" )) == NULL )
	{
		printerr(wp,strerror(errno),"Press any key to exit");
/*		printerr(wp,"File doesn't exist","Press any key to exit"); */
		return -1;
	}
	
	stat(argv[0], &statbuf);
	totalbytes= statbuf.st_size;
/* 	mode = statbuff.st_mode; */

        if(color)
        {
                start_color();
                init_pair(1,COLOR_BLACK, COLOR_WHITE);
		init_pair(2,COLOR_WHITE, COLOR_BLUE);
                wattron(wp, COLOR_PAIR(1));
        }

	move(0,0);
	printw("%*c",80,' ');	
	move(screen_y-2,0);
	printw("%*c",80,' ');

	move(0,3);
	printw("%s", argv[0]);

	printheader( wp, 0 );

	move(screen_y-2,3);
	wattron(wp, COLOR_PAIR(2));
	printw("Q)uit");
	move(screen_y-2,9);
	printw("M)odify");
	move(screen_y-2,17);
	printw("W)rite block");
	move(screen_y-2,30);
	printw("^V-page down");
	move(screen_y-2,43);
	printw("^Y-page up");
	move(screen_y-2,54);
	printw("^R-refresh");
	refresh();

        if(color)
                wattroff(wp, COLOR_PAIR(2));


	message_loop(wp, in);

	fclose(in);

	return 0;
}

/*
 * print header
 * input: pointer to the current window
 *        offset to start at
 *
 * prints the header (the top line in the window)
 */

void printheader( WINDOW *wp, int offset) 
{

        if(color)
        {
                start_color();
                init_pair(1,COLOR_BLACK, COLOR_WHITE);
		init_pair(2,COLOR_WHITE, COLOR_BLUE);
                wattron(wp, COLOR_PAIR(1));
        }

	move(0,60);
        printw("%X/%X bytes\n",offset,totalbytes);

        if(color)
                wattroff(wp, COLOR_PAIR(2));


}