This skips identical lines in hexdump output, like 'od' or 'xxd -a' also do.
Christian
PS: I would suggest to change hexdump 'buf' parameter from 'char *' to
'const void *' to avoid unnecessary casts.
2009-01-30 Christian Franke <fra...@computer.org>
* lib/hexdump.c (hexdump): Print at most 3 lines if data is identical.
diff --git a/lib/hexdump.c b/lib/hexdump.c
index 9b79f45..7689edf 100644
--- a/lib/hexdump.c
+++ b/lib/hexdump.c
@@ -61,6 +61,22 @@ hexdump (unsigned long bse, char *buf, int len)
grub_printf ("%s\n", line);
+ /* Print only first and last line of more than 3 lines are identical. */
+ if (len >= 4 * 16
+ && ! grub_memcmp (buf, buf + 1 * 16, 16)
+ && ! grub_memcmp (buf, buf + 2 * 16, 16)
+ && ! grub_memcmp (buf, buf + 3 * 16, 16))
+ {
+ grub_printf ("*\n");
+ do
+ {
+ bse += 16;
+ buf += 16;
+ len -= 16;
+ }
+ while (len >= 3 * 16 && ! grub_memcmp (buf, buf + 2 * 16, 16));
+ }
+
bse += 16;
buf += 16;
len -= cnt;
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