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hastyhex.c
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hastyhex.c
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#include <errno.h>
#include <stdio.h>
#include <string.h>
#define VERSION "1.0.0"
static const char hex[16] = "0123456789abcdef";
/* Same as isalnum(3), but without locale. */
static int
xisalnum(int c)
{
return (c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z');
}
/* Same as strchr(3). */
static const char *
xstrchr(const char *s, int c)
{
for (c = (char)c;; s++) {
if (*s == c) {
return s;
} else if (!*s) {
return 0;
}
}
}
static int
color(int b)
{
#define CN 0x37 /* null */
#define CS 0x92 /* space */
#define CP 0x96 /* print */
#define CC 0x95 /* control */
#define CH 0x93 /* high */
static const unsigned char table[] = {
CN, CC, CC, CC, CC, CC, CC, CC, CC, CC, CS, CS, CS, CS, CC, CC,
CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC, CC,
CS, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP,
CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP,
CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP,
CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP,
CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP,
CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP, CC,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH,
CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH, CH
};
return table[b];
}
static int
display(int b)
{
static const char table[] = {
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x20,
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b,
0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41,
0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62,
0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d,
0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e, 0x2e,
0x2e, 0x2e, 0x2e,
};
return table[b];
}
static void
process_color(FILE *in, FILE *out)
{
int i, n;
unsigned long offset = 0;
unsigned char input[16] = {0};
char template[] =
"00000000 "
"\33[XXm## \33[XXm## \33[XXm## \33[XXm## "
"\33[XXm## \33[XXm## \33[XXm## \33[XXm## "
"\33[XXm## \33[XXm## \33[XXm## \33[XXm## "
"\33[XXm## \33[XXm## \33[XXm## \33[XXm## "
"\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm."
"\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm.\33[XXm."
"\33[0m\n";
static const int slots[] = {
/* ANSI-color, hex, ANSI-color, ASCII */
12, 15, 142, 145,
20, 23, 148, 151,
28, 31, 154, 157,
36, 39, 160, 163,
44, 47, 166, 169,
52, 55, 172, 175,
60, 63, 178, 181,
68, 71, 184, 187,
77, 80, 190, 193,
85, 88, 196, 199,
93, 96, 202, 205,
101, 104, 208, 211,
109, 112, 214, 217,
117, 120, 220, 223,
125, 128, 226, 229,
133, 136, 232, 235
};
do {
n = fread(input, 1, 16, in);
/* Write the offset */
for (i = 0; i < 8; i++)
template[i] = hex[(offset >> (28 - i * 4)) & 15];
/* Fill out the template */
for (i = 0; i < 16; i++) {
/* Use a fixed loop count instead of "n" to encourage loop
* unrolling by the compiler. Empty bytes will be erased
* later.
*/
int v = input[i];
int c = color(v);
template[slots[i * 4 + 0] + 0] = hex[c >> 4];
template[slots[i * 4 + 0] + 1] = hex[c & 15];
template[slots[i * 4 + 1] + 0] = hex[v >> 4];
template[slots[i * 4 + 1] + 1] = hex[v & 15];
template[slots[i * 4 + 2] + 0] = hex[c >> 4];
template[slots[i * 4 + 2] + 1] = hex[c & 15];
template[slots[i * 4 + 3] + 0] = display(v);
}
/* Erase any trailing bytes */
for (i = n; i < 16; i++) {
/* This loop is only used once: the last line of output. The
* branch predictor will quickly learn that it's never taken.
*/
template[slots[i * 4 + 0] + 0] = '0';
template[slots[i * 4 + 0] + 1] = '0';
template[slots[i * 4 + 1] + 0] = ' ';
template[slots[i * 4 + 1] + 1] = ' ';
template[slots[i * 4 + 2] + 0] = '0';
template[slots[i * 4 + 2] + 1] = '0';
template[slots[i * 4 + 3] + 0] = ' ';
}
if (!fwrite(template, sizeof(template) - 1, 1, out))
break; /* Output error */
offset += 16;
} while (n == 16);
}
static void
process_plain(FILE *in, FILE *out)
{
int i, n;
unsigned long offset = 0;
unsigned char input[16] = {0};
char template[] =
"00000000 ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## "
"................\n";
static const int slots[] = {
10, 60, 13, 61, 16, 62, 19, 63, 22, 64, 25, 65, 28, 66, 31, 67,
35, 68, 38, 69, 41, 70, 44, 71, 47, 72, 50, 73, 53, 74, 56, 75
};
do {
n = fread(input, 1, 16, in);
/* Write the offset */
for (i = 0; i < 8; i++)
template[i] = hex[(offset >> (28 - i * 4)) & 15];
/* Fill out the template */
for (i = 0; i < 16; i++) {
int v = input[i];
template[slots[i * 2 + 0] + 0] = hex[v >> 4];
template[slots[i * 2 + 0] + 1] = hex[v & 15];
template[slots[i * 2 + 1] + 0] = display(v);
}
/* Erase any trailing bytes */
for (i = n; i < 16; i++) {
template[slots[i * 2 + 0] + 0] = ' ';
template[slots[i * 2 + 0] + 1] = ' ';
template[slots[i * 2 + 1] + 0] = ' ';
}
if (!fwrite(template, sizeof(template) - 1, 1, out))
break;
offset += 16;
} while (n == 16);
}
static int xoptind = 1;
static int xoptopt;
static char *xoptarg;
/* Same as getopt(3) but never prints errors. */
static int
xgetopt(int argc, char * const argv[], const char *optstring)
{
static int optpos = 1;
const char *arg;
arg = xoptind < argc ? argv[xoptind] : 0;
if (arg && arg[0] == '-' && arg[1] == '-' && !arg[2]) {
xoptind++;
return -1;
} else if (!arg || arg[0] != '-' || !xisalnum(arg[1])) {
return -1;
} else {
const char *opt = xstrchr(optstring, arg[optpos]);
xoptopt = arg[optpos];
if (!opt) {
return '?';
} else if (opt[1] == ':') {
if (arg[optpos + 1]) {
xoptarg = (char *)arg + optpos + 1;
xoptind++;
optpos = 1;
return xoptopt;
} else if (argv[xoptind + 1]) {
xoptarg = (char *)argv[xoptind + 1];
xoptind += 2;
optpos = 1;
return xoptopt;
} else {
return ':';
}
} else {
if (!arg[++optpos]) {
xoptind++;
optpos = 1;
}
return xoptopt;
}
}
}
static int
usage(FILE *f)
{
static const char usage[] =
"usage: hastyhex [-fhlp] [-o FILE]\n"
" -f force output fully-buffered\n"
" -h print this help message\n"
" -l force output line-buffered\n"
" -o FILE output to file instead of standard output\n"
" -p do not output color (\"plain\")\n"
" -V print version information\n";
return fwrite(usage, sizeof(usage)-1, 1, f) && !fflush(f);
}
static int
version(void)
{
static const char version[] = "hastyhex " VERSION "\n";
return fwrite(version, sizeof(version)-1, 1, stdout) && !fflush(stdout);
}
static const char *
run(int argc, char **argv)
{
int option;
FILE *in = stdin;
FILE *out = stdout;
const char *outfile = 0;
enum {MODE_COLOR, MODE_PLAIN} mode = MODE_COLOR;
enum {BUF_AUTO, BUF_LINE, BUF_FULL} buf_mode = BUF_AUTO;
static char missing[] = "missing argument: -?";
static char illegal[] = "illegal option: -?";
#ifdef _WIN32
{ /* Set stdin/stdout to binary mode. */
int _setmode(int, int);
_setmode(0, 0x8000);
_setmode(1, 0x8000);
}
{ /* Best effort enable ANSI escape processing. */
__declspec(dllimport) void *__stdcall GetStdHandle(unsigned);
__declspec(dllimport) int __stdcall GetConsoleMode(void *, unsigned *);
__declspec(dllimport) int __stdcall SetConsoleMode(void *, unsigned);
void *handle;
unsigned mode;
handle = GetStdHandle(-11); /* STD_OUTPUT_HANDLE */
if (GetConsoleMode(handle, &mode)) {
mode |= 0x0004; /* ENABLE_VIRTUAL_TERMINAL_PROCESSING */
SetConsoleMode(handle, mode); /* ignore errors */
}
}
#endif
while ((option = xgetopt(argc, argv, ":fhlo:pV")) != -1) {
switch (option) {
case 'f': buf_mode = BUF_FULL;
break;
case 'h': return usage(stdout) ? 0 : "write error";
case 'l': buf_mode = BUF_LINE;
break;
case 'o': outfile = xoptarg;
break;
case 'p': mode = MODE_PLAIN;
break;
case 'V': return version() ? 0 : "write error";
case ':': missing[sizeof(missing)-2] = xoptopt;
usage(stderr);
return missing;
case '?': illegal[sizeof(illegal)-2] = xoptopt;
usage(stderr);
return illegal;
}
}
/* Configure input */
if (argv[xoptind]) {
char *path = argv[xoptind];
if (argv[xoptind+1]) {
return "too many arguments";
}
if (path[0] != '-' || path[1] != 0) {
in = fopen(path, "rb");
if (!in) {
return path;
}
}
}
/* Configure output */
if (outfile) {
out = fopen(outfile, "wb");
if (!out) {
return outfile;
}
}
switch (buf_mode) {
static char buf[1L << 18];
case BUF_AUTO: break;
case BUF_LINE: setvbuf(out, buf, _IOLBF, sizeof(buf)); break;
case BUF_FULL: setvbuf(out, buf, _IOFBF, sizeof(buf)); break;
}
/* Process input using user-selected mode */
switch (mode) {
case MODE_COLOR: process_color(in, out); break;
case MODE_PLAIN: process_plain(in, out); break;
}
/* Check for errors before exiting */
if (ferror(in)) {
return "input error";
}
if (fflush(out) || ferror(out)) {
return "output error";
}
return 0;
}
int
main(int argc, char **argv)
{
const char *err = run(argc, argv);
if (err) {
fputs("hastyhex: ", stderr);
if (errno) {
fputs(strerror(errno), stderr);
fputs(": ", stderr);
}
fputs(err, stderr);
fputs("\n", stderr);
return 1;
}
return 0;
}