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#include <debug.h>
#include <stdio.h>
#include <ctype.h>
#define NUM_COLS (32)
/* returns the number of non-zero non-printable characters. */
int dump_hex_buffer(FILE *s, void *b, size_t len, size_t elsize) {
int num_nonprintable = 0;
int i, last;
char *pchr = (char *)b;
fputc('\n', s);
for (i = last = 0; i < len; i++) {
if (!elsize) {
if (i && !(i % 4)) fprintf(s, " ");
if (i && !(i % 8)) fprintf(s, " ");
} else {
if (i && !(i % elsize)) fprintf(s, " ");
}
if (i && !(i % NUM_COLS)) {
while (last < i) {
if (isprint(pchr[last]))
fputc(pchr[last], s);
else {
fputc('.', s);
if(pchr[last])
num_nonprintable++;
}
last++;
}
fprintf(s, " (%d)\n", i);
}
fprintf(s, "%02x", (unsigned char)pchr[i]);
}
if (i && (i % NUM_COLS)) fputs("\n", s);
return num_nonprintable;
}
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