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/* hexedit.c - Hexadecimal file editor
*
* Copyright 2015 Rob Landley <rob@landley.net>
*
* No standard
USE_HEXEDIT(NEWTOY(hexedit, "<1>1", TOYFLAG_USR|TOYFLAG_BIN))
config HEXEDIT
bool "hexedit"
default n
help
usage: hexedit FILENAME
Hexadecimal file editor.
*/
#define FOR_hexedit
#include "toys.h"
GLOBALS(
char *data;
long long len, base;
int numlen;
unsigned height;
)
static void sigttyreset(int i)
{
set_terminal(1, 0, 0);
// how do I re-raise the signal so it dies with right signal info for wait()?
_exit(127);
}
static void esc(char *s)
{
printf("\033[%s", s);
}
static void jump(x, y)
{
char s[32];
sprintf(s, "%d;%dH", y+1, x+1);
esc(s);
}
static void draw_line(long long yy)
{
int x;
yy = (TT.base+yy)*16;
if (yy<TT.len) {
printf("\r%0*llX ", TT.numlen, yy);
for (x=0; x<16; x++) {
if (yy+x<TT.len) printf(" %02X", TT.data[yy+x]);
else printf(" ");
}
printf(" ");
for (x=0; x<16; x++) printf("X");
}
esc("K");
}
static void highlight(char c, unsigned x, unsigned y)
{
jump(2+TT.numlen+3*x, y);
printf("%02X", c);
}
void draw_page(void)
{
int y;
jump(0, 0);
for (y = 0; y<TT.height; y++) {
if (y) printf("\r\n");
draw_line(y);
}
}
#define KEY_UP 256
#define KEY_DOWN 257
#define KEY_RIGHT 258
#define KEY_LEFT 259
#define KEY_PGUP 260
#define KEY_PGDN 261
#define KEY_HOME 262
#define KEY_END 263
#define KEY_INSERT 264
void hexedit_main(void)
{
// up down right left pgup pgdn home end ins
char *keys[] = {"\033[A", "\033[B", "\033[C", "\033[D", "\033[5~", "\033[6~",
"\033OH", "\033OF", "\033[2~", 0};
long long pos;
int x, y, key, fd = xopen(*toys.optargs, O_RDONLY);
TT.height = 25;
terminal_size(0, &TT.height);
sigatexit(sigttyreset);
esc("0m");
esc("?25l");
fflush(0);
set_terminal(1, 1, 0);
if ((TT.len = fdlength(fd))<0) error_exit("bad length");
if (sizeof(long)==32 && TT.len>SIZE_MAX) TT.len = SIZE_MAX;
// count file length hex digits, rounded up to multiple of 4
for (pos = TT.len, TT.numlen = 0; pos; pos >>= 4, TT.numlen++);
TT.numlen += (4-TT.numlen)&3;
TT.data = mmap(0, TT.len, PROT_READ, MAP_SHARED, fd, 0);
draw_page();
y = x = 0;
for (;;) {
pos = 16*(TT.base+y)+x;
if (pos>=TT.len) {
pos = TT.len-1;
x = (TT.len-1)%15;
}
esc("7m");
highlight(TT.data[pos], x, y);
fflush(0);
key = scan_key(toybuf, keys, 1);
if (key==-1 || key==4 || key==27) break;
esc("0m");
highlight(TT.data[pos], x, y);
//jump(73,0);
//printf("%d[%c]", key, (key > 255) ? 'X' : key);
if (key==KEY_UP) {
if (--y<0) {
if (TT.base) {
TT.base--;
esc("1T");
jump(0, 0);
draw_line(0);
}
y = 0;
}
} else if (key==KEY_DOWN) {
if (y == TT.height-1 && pos+32<TT.len) {
TT.base++;
esc("1S");
jump(0, TT.height-1);
draw_line(TT.height-1);
}
if (pos+16<TT.len && ++y>=TT.height) y--;
} else if (key==KEY_RIGHT) {
if (x<15 && pos+1<TT.len) x++;
} else if (key==KEY_LEFT) {
if (x) x--;
} else if (key==KEY_PGUP) {
TT.base -= TT.height;
if (TT.base<0) TT.base = 0;
draw_page();
} else if (key==KEY_PGDN) {
TT.base += TT.height;
if ((TT.base*16)>=TT.len) TT.base=(TT.len-1)/16;
draw_page();
} else if (key==KEY_HOME) {
TT.base = 0;
draw_page();
} else if (key==KEY_END) {
TT.base=(TT.len-1)/16;
draw_page();
}
}
munmap(TT.data, TT.len);
close(fd);
set_terminal(1, 0, 0);
esc("?25h");
esc("0m");
jump(0, 999);
xputc('\n');
// DEBUG: dump unknown escape sequence
for (;;) {
key = scan_key(toybuf, keys, 0);
if (key >= 0) printf("%d(%c) ", key, key);
else {
printf("%d\n", key);
break;
}
}
xputc('\n');
}
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