display.c:

	- 'savech' is only used if it is set a few lines above where
	  it is used, initialize it to silence warning.

	- 'length' is either -1 or greater than 0, hence it is safe to cast it
	  to unsigned when comparing it here.

odsyntax.c:
	- 'p' is assigned either (*argvp)[0] or (*argvp)[1] which both are
	  char *. 'num' and 'end' are assigned values based on 'p'.
	  Hence use char * instead of unsigned char * for these variables.

	  '&end' as the second argument to strtoll does not need to be casted
	  to char** any more.

	  This solves a
	  'dereferencing type-punned pointer will break strict-aliasing rules'
	  warning when compiling with -O2.

parse.c:
	- 'prec' is only used when sokay == USEPREC and sokay = USEPREC
	  when 'prec' is assigned. Hence 'prec' is not used uninitialized,
	  initialize it to silence warning.

	- The code involving 'nextpr' is hard to follow, but I belive
	  'nextpr' will not be used unless it is initialized.
	  Anyway, IF 'nextpr' is used uninitialized it is better to
	  get a consistant error (seg fault, when dereferencing a NULL pointer)
	  than potentially accessing some random memory.

The above changes makes hexdump WARNS=6 clean even when compiled with
-O2. Hence bump WARNS to keep it clean.

Tested by:	CFLAGS='-O2 -pipe' make universe

1 files changed, 2 insertions, 1 deletions

diff --git a/usr.bin/hexdump/display.c b/usr.bin/hexdump/display.c
index c9ba892..0887f05 100644
--- a/usr.bin/hexdump/display.c
+++ b/usr.bin/hexdump/display.c
@@ -68,6 +68,7 @@ display(void)
 	off_t saveaddress;
 	u_char savech, *savebp;
 
+	savech = 0;
 	while ((bp = get()))
 	    for (fs = fshead, savebp = bp, saveaddress = address; fs;
 		fs = fs->nextfs, bp = savebp, address = saveaddress)
@@ -318,7 +319,7 @@ peek(u_char *buf, size_t nbytes)
 	size_t n, nread;
 	int c;
 
-	if (length != -1 && nbytes > length)
+	if (length != -1 && nbytes > (unsigned int)length)
 		nbytes = length;
 	nread = 0;
 	while (nread < nbytes && (c = getchar()) != EOF) {