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use a different, more readable approach.

This commit is contained in:
christos 2017-12-08 23:49:01 +00:00
parent f6a791a3a0
commit f0d31504f3
1 changed files with 50 additions and 26 deletions
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76
sys/lib/libkern/hexdump.c
View File

@ -27,43 +27,67 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: hexdump.c,v 1.1 2017/12/08 21:51:07 christos Exp $");
__KERNEL_RCSID(0, "$NetBSD: hexdump.c,v 1.2 2017/12/08 23:49:01 christos Exp $");
#ifndef _KERNEL
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
static const char hexdigits[] = "0123456789abcdef";
#else
#include <lib/libkern/libkern.h>
#include <sys/systm.h>
#endif
#define MID (3 * 8)
#define BAR ((3 * 16) + 1)
#define ASC (BAR + 2)
#define NL (BAR + 18)
void
hexdump(const char *msg, const void *ptr, size_t len)
{
size_t i;
size_t i, p, q;
const unsigned char *u = ptr;
char buf[NL + 2];
if (msg)
printf("%s: %zu bytes @ %p\n", msg, len, ptr);
for (i = 0; i < len; ) {
printf("%02x ", u[i++]);
if (!(i & 0x7))
printf(" ");
if (!(i & 0xf)) {
printf("| ");
for (size_t j = i - 16; j < i; j++) {
unsigned char c = u[j];
printf("%c", isprint(c) ? c : '.');
}
printf("\n");
}
}
if ((i = (len & 0xf)) != 0) {
for (size_t j = 16 - i; j > 0; j--) {
printf(" ");
if (!(j & 0x7) && i != 8)
printf(" ");
}
printf(" | ");
for (size_t j = len - i; j < len; j++) {
unsigned char c = u[j];
printf("%c", isprint(c) ? c : '.');
buf[BAR] = '|';
buf[BAR + 1] = ' ';
buf[NL] = '\n';
buf[NL + 1] = '\0';
memset(buf, ' ', BAR);
for (q = p = i = 0; i < len; i++) {
unsigned char c = u[i];
buf[p++] = hexdigits[(c >> 4) & 0xf];
buf[p++] = hexdigits[(c >> 0) & 0xf];
buf[p++] = ' ';
if (q == 7)
buf[p++] = ' ';
buf[ASC + q++] = isprint(c) ? c : '.';
if (q == 16) {
q = p = 0;
printf("%s", buf);
memset(buf, ' ', BAR);
}
printf("\n");
}
if (q) {
buf[ASC + q++] = '\n';
buf[ASC + q] = '\0';
printf("%s", buf);
}
}
#ifndef _KERNEL
int
main(int argc, char *argv[])
{
hexdump("foo", main, atoi(argv[1]));
return 0;
}
#endif