aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--toys/pending/hexedit.c112
1 files changed, 78 insertions, 34 deletions
diff --git a/toys/pending/hexedit.c b/toys/pending/hexedit.c
index 727203c4..668e51c4 100644
--- a/toys/pending/hexedit.c
+++ b/toys/pending/hexedit.c
@@ -4,7 +4,7 @@
*
* No standard
-USE_HEXEDIT(NEWTOY(hexedit, "<1>1", TOYFLAG_USR|TOYFLAG_BIN))
+USE_HEXEDIT(NEWTOY(hexedit, "<1>1r", TOYFLAG_USR|TOYFLAG_BIN))
config HEXEDIT
bool "hexedit"
@@ -13,6 +13,8 @@ config HEXEDIT
usage: hexedit FILENAME
Hexadecimal file editor.
+
+ -r Read only (display but don't edit)
*/
#define FOR_hexedit
@@ -30,7 +32,7 @@ static void esc(char *s)
printf("\033[%s", s);
}
-static void jump(x, y)
+static void jump(int x, int y)
{
char s[32];
@@ -53,6 +55,24 @@ static void sigttyreset(int i)
_exit(127);
}
+// Render all characters printable, using color to distinguish.
+static void draw_char(char broiled)
+{
+ if (broiled<32 || broiled>=127) {
+ if (broiled>127) {
+ esc("2m");
+ broiled &= 127;
+ }
+ if (broiled<32 || broiled==127) {
+ esc("7m");
+ if (broiled==127) broiled = 32;
+ else broiled += 64;
+ }
+ printf("%c", broiled);
+ esc("0m");
+ } else printf("%c", broiled);
+}
+
static void draw_line(long long yy)
{
int x;
@@ -66,34 +86,12 @@ static void draw_line(long long yy)
else printf(" ");
}
printf(" ");
- for (x=0; x<16; x++) {
- char broiled = TT.data[yy+x];
-
- if (broiled<32 || broiled>=127) {
- if (broiled>127) {
- esc("2m");
- broiled &= 127;
- }
- if (broiled<32 || broiled==127) {
- esc("7m");
- if (broiled==127) broiled = 32;
- else broiled += 64;
- }
- printf("%c", broiled);
- esc("0m");
- } else printf("%c", broiled);
- }
+ for (x=0; x<16; x++) draw_char(TT.data[yy+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)
+static void draw_page(void)
{
int y;
@@ -104,6 +102,26 @@ void draw_page(void)
}
}
+// side: 0 = editing left, 1 = editing right, 2 = clear, 3 = read only
+static void highlight(int xx, int yy, int side)
+{
+ char cc = TT.data[16*(TT.base+yy)+xx];
+ int i;
+
+ // Display cursor
+ jump(2+TT.numlen+3*xx, yy);
+ esc("0m");
+ if (side!=2) esc("7m");
+ if (side>1) printf("%02X", cc);
+ else for (i=0; i<2;) {
+ if (side==i) esc("32m");
+ printf("%X", (cc>>(4*(1&++i)))&15);
+ }
+ esc("0m");
+ jump(TT.numlen+17*3+xx, yy);
+ draw_char(cc);
+}
+
#define KEY_UP 256
#define KEY_DOWN 257
#define KEY_RIGHT 258
@@ -120,7 +138,8 @@ void hexedit_main(void)
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);
+ int x, y, i, side = 0, key, ro = toys.optflags&FLAG_r,
+ fd = xopen(*toys.optargs, ro ? O_RDONLY : O_RDWR);
TT.height = 25;
terminal_size(0, &TT.height);
@@ -137,25 +156,49 @@ void hexedit_main(void)
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);
+ TT.data = mmap(0, TT.len, PROT_READ|(PROT_WRITE*!ro), MAP_SHARED, fd, 0);
draw_page();
y = x = 0;
for (;;) {
+ // Get position within file, trimming if we overshot end.
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);
+
+ // Display cursor
+ highlight(x, y, ro ? 3 : side);
fflush(0);
- key = scan_key(toybuf, keys, 1);
- if (key==-1 || key==4 || key==27 || key=='q') break;
- esc("0m");
- highlight(TT.data[pos], x, y);
+ // Wait for next key
+ key = scan_key(toybuf, keys, 1);
+ // Exit for q, ctrl-c, ctrl-d, escape, or EOF
+ if (key==-1 || key==3 || key==4 || key==27 || key=='q') break;
+ highlight(x, y, 2);
+
+ if (key>='a' && key<='f') key-=32;
+ if (!ro && ((key>='0' && key<='9') || (key>='A' && key<='F'))) {
+ i = key - '0';
+ if (i>9) i -= 7;
+ TT.data[pos] &= 15<<(4*side);
+ TT.data[pos] |= i<<(4*!side);
+
+ highlight(x, y, ++side);
+ if (side==2) {
+ side = 0;
+ if (++pos<TT.len && ++x==16) {
+ x = 0;
+ if (++y == TT.height) {
+ --y;
+ goto down;
+ }
+ }
+ }
+ }
+ if (key>255) side = 0;
if (key==KEY_UP) {
if (--y<0) {
if (TT.base) {
@@ -170,6 +213,7 @@ void hexedit_main(void)
}
} else if (key==KEY_DOWN) {
if (y == TT.height-1 && pos+32<TT.len) {
+down:
TT.base++;
esc("1S");
jump(0, TT.height-1);