static ssize_t read_buildid(void *va, long n, off64_t off)
{
/* Each build_id byte needs 2 chars, and 1 for the \0 */
char build_id[BUILD_ID_SZ * 2 + 1] = {0};
uint8_t hi, lo;
uint8_t *b = (uint8_t*)get_build_id_start();
for (int i = 0; i < BUILD_ID_SZ; i++) {
hi = *b >> 4;
lo = *b & 0xf;
build_id[i * 2 + 0] = num_to_nibble(hi);
build_id[i * 2 + 1] = num_to_nibble(lo);
b++;
}
return readmem(off, va, n, build_id, sizeof(build_id));
}
int printf_hexdump(FILE *stream, const struct printf_info *info,
const void *const *args)
{
uint8_t *arg = *(uint8_t**)args[0];
char *buf, *p;
int ret;
/* 3 chars per byte, one for the space */
buf = malloc(3 * info->prec);
p = buf;
for (int i = 0; i < info->prec; i++) {
if (i)
*p++ = ' ';
*p++ = num_to_nibble(*arg >> 4);
*p++ = num_to_nibble(*arg);
arg++;
}
ret = fwrite(buf, 1, p - buf, stream);
free(buf);
return ret;
}
