diff options
Diffstat (limited to 'toys/other/hexedit.c')
| -rw-r--r-- | toys/other/hexedit.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/toys/other/hexedit.c b/toys/other/hexedit.c new file mode 100644 index 00000000..518755bb --- /dev/null +++ b/toys/other/hexedit.c @@ -0,0 +1,250 @@ +/* hexedit.c - Hexadecimal file editor + * + * Copyright 2015 Rob Landley <rob@landley.net> + * + * No standard + +USE_HEXEDIT(NEWTOY(hexedit, "<1>1r", TOYFLAG_USR|TOYFLAG_BIN)) + +config HEXEDIT + bool "hexedit" + default y + help + usage: hexedit FILENAME + + Hexadecimal file editor. + + -r Read only (display but don't edit) +*/ + +#define FOR_hexedit +#include "toys.h" + +GLOBALS( + char *data; + long long len, base; + int numlen; + unsigned height; +) + +static void esc(char *s) +{ + printf("\033[%s", s); +} + +static void jump(int x, int y) +{ + char s[32]; + + sprintf(s, "%d;%dH", y+1, x+1); + esc(s); +} + +static void fix_terminal(void) +{ + set_terminal(1, 0, 0); + esc("?25h"); + esc("0m"); + jump(0, 999); +} + +static void sigttyreset(int i) +{ + fix_terminal(); + // how do I re-raise the signal so it dies with right signal info for wait()? + _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; + + 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++) draw_char(TT.data[yy+x]); + } + esc("K"); +} + +static void draw_page(void) +{ + int y; + + jump(0, 0); + for (y = 0; y<TT.height; y++) { + if (y) printf("\r\n"); + draw_line(y); + } +} + +// 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 +#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, 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); + if (TT.height) 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|(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; + } + + // Display cursor + highlight(x, y, ro ? 3 : side); + fflush(0); + + // 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) { + TT.base--; + esc("1T"); + jump(0, TT.height); + esc("K"); + jump(0, 0); + draw_line(0); + } + y = 0; + } + } else if (key==KEY_DOWN) { + if (y == TT.height-1 && pos+32<TT.len) { +down: + 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; + while ((TT.base+y)*16>=TT.len) y--; + if (16*(TT.base+y)+x>=TT.len) x = (TT.len-1)&15; + draw_page(); + } else if (key==KEY_HOME) { + TT.base = 0; + x = 0; + draw_page(); + } else if (key==KEY_END) { + TT.base=(TT.len-1)/16; + x = (TT.len-1)&15; + draw_page(); + } + } + munmap(TT.data, TT.len); + close(fd); + fix_terminal(); +} |