Fix types-related warnings based on clang diagnostics

1. Fix some places where unsigned value compared < 0
2. Fix obsolete %Z specifier to more portable %z
3. Some erroneous types substitution
4. nl_msec2str() - 64-bit msec is now properly used,

Only safe changes. I mean int <--> uint32_t and signed/unsigned fixes.
Some functinos require size_t argument instead of int, but changes of
signatures of that functions is terrible thing.

Also, I do not pretend for a full list of fixes.
Just to shut up clang -Wall -Wextra

One more thing. ifindex. I don't change that because changes will
be too big for simple fix.

18 files changed, 63 insertions, 51 deletions

diff --git a/lib/addr.c b/lib/addr.c
index 89d3d4f..3acd9e4 100644
--- a/lib/addr.c
+++ b/lib/addr.c
@@ -368,7 +368,7 @@ int nl_addr_parse(const char *addrstr, int hint, struct nl_addr **result)
 	}
 
 	if (hint == AF_UNSPEC && strchr(str, ':')) {
-		int i = 0;
+		size_t i = 0;
 		char *s = str, *p;
 		for (;;) {
 			long l = strtol(s, &p, 16);
@@ -542,7 +542,7 @@ int nl_addr_cmp_prefix(struct nl_addr *a, struct nl_addr *b)
  */
 int nl_addr_iszero(struct nl_addr *addr)
 {
-	int i;
+	unsigned int i;
 
 	for (i = 0; i < addr->a_len; i++)
 		if (addr->a_addr[i])
@@ -823,7 +823,7 @@ unsigned int nl_addr_get_prefixlen(struct nl_addr *addr)
  */
 char *nl_addr2str(struct nl_addr *addr, char *buf, size_t size)
 {
-	int i;
+	unsigned int i;
 	char tmp[16];
 
 	if (!addr || !addr->a_len) {
diff --git a/lib/attr.c b/lib/attr.c
index 6ef6cd9..a095649 100644
--- a/lib/attr.c
+++ b/lib/attr.c
@@ -188,7 +188,8 @@ static int validate_nla(struct nlattr *nla, int maxtype,
 			struct nla_policy *policy)
 {
 	struct nla_policy *pt;
-	int minlen = 0, type = nla_type(nla);
+	unsigned int minlen = 0;
+	int type = nla_type(nla);
 
 	if (type <= 0 || type > maxtype)
 		return 0;
diff --git a/lib/data.c b/lib/data.c
index e4196b1..f019539 100644
--- a/lib/data.c
+++ b/lib/data.c
@@ -110,9 +110,6 @@ struct nl_data *nl_data_clone(struct nl_data *src)
  */
 int nl_data_append(struct nl_data *data, void *buf, size_t size)
 {
-	if (size < 0)
-		BUG();
-
 	if (size > 0) {
 		data->d_data = realloc(data->d_data, data->d_size + size);
 		if (!data->d_data)
diff --git a/lib/genl/genl.c b/lib/genl/genl.c
index 569ef9e..8d3def3 100644
--- a/lib/genl/genl.c
+++ b/lib/genl/genl.c
@@ -223,9 +223,9 @@ struct genlmsghdr *genlmsg_hdr(struct nlmsghdr *nlh)
  */
 int genlmsg_len(const struct genlmsghdr *gnlh)
 {
-	struct nlmsghdr *nlh;
+	const struct nlmsghdr *nlh;
 
-	nlh = (struct nlmsghdr *)((unsigned char *) gnlh - NLMSG_HDRLEN);
+	nlh = (const struct nlmsghdr *)((const unsigned char *) gnlh - NLMSG_HDRLEN);
 	return (nlh->nlmsg_len - GENL_HDRLEN - NLMSG_HDRLEN);
 }
 
diff --git a/lib/msg.c b/lib/msg.c
index 18174b5..0adc091 100644
--- a/lib/msg.c
+++ b/lib/msg.c
@@ -178,7 +178,7 @@ int nlmsg_valid_hdr(const struct nlmsghdr *nlh, int hdrlen)
  */
 int nlmsg_ok(const struct nlmsghdr *nlh, int remaining)
 {
-	return (remaining >= (int)sizeof(struct nlmsghdr) &&
+	return (remaining >= sizeof(struct nlmsghdr) &&
 		nlh->nlmsg_len >= sizeof(struct nlmsghdr) &&
 		nlh->nlmsg_len <= remaining);
 }
@@ -867,7 +867,7 @@ void nl_msg_dump(struct nl_msg *msg, FILE *ofd)
 	"--------------------------   BEGIN NETLINK MESSAGE "
 	"---------------------------\n");
 
-	fprintf(ofd, "  [HEADER] %Zu octets\n", sizeof(struct nlmsghdr));
+	fprintf(ofd, "  [HEADER] %zu octets\n", sizeof(struct nlmsghdr));
 	print_hdr(ofd, msg);
 
 	if (hdr->nlmsg_type == NLMSG_ERROR &&
@@ -875,10 +875,10 @@ void nl_msg_dump(struct nl_msg *msg, FILE *ofd)
 		struct nl_msg *errmsg;
 		struct nlmsgerr *err = nlmsg_data(hdr);
 
-		fprintf(ofd, "  [ERRORMSG] %Zu octets\n", sizeof(*err));
+		fprintf(ofd, "  [ERRORMSG] %zu octets\n", sizeof(*err));
 		fprintf(ofd, "    .error = %d \"%s\"\n", err->error,
 			strerror(-err->error));
-		fprintf(ofd, "  [ORIGINAL MESSAGE] %Zu octets\n", sizeof(*hdr));
+		fprintf(ofd, "  [ORIGINAL MESSAGE] %zu octets\n", sizeof(*hdr));
 
 		errmsg = nlmsg_inherit(&err->msg);
 		print_hdr(ofd, errmsg);
diff --git a/lib/nl.c b/lib/nl.c
index b572a1a..6b2f027 100644
--- a/lib/nl.c
+++ b/lib/nl.c
@@ -417,7 +417,7 @@ errout:
 int nl_recv(struct nl_sock *sk, struct sockaddr_nl *nla,
 	    unsigned char **buf, struct ucred **creds)
 {
-	int n;
+	ssize_t n;
 	int flags = 0;
 	static int page_size = 0;
 	struct iovec iov;
diff --git a/lib/object.c b/lib/object.c
index df1c963..055a208 100644
--- a/lib/object.c
+++ b/lib/object.c
@@ -285,14 +285,14 @@ void nl_object_dump_buf(struct nl_object *obj, char *buf, size_t len)
 int nl_object_identical(struct nl_object *a, struct nl_object *b)
 {
 	struct nl_object_ops *ops = obj_ops(a);
-	int req_attrs;
+	uint32_t req_attrs;
 
 	/* Both objects must be of same type */
 	if (ops != obj_ops(b))
 		return 0;
 
 	req_attrs = ops->oo_id_attrs;
-	if (req_attrs == ~0)
+	if (req_attrs == 0xFFFFFFFF)
 		req_attrs = a->ce_mask & b->ce_mask;
 
 	/* Both objects must provide all required attributes to uniquely
diff --git a/lib/route/addr.c b/lib/route/addr.c
index deb88ba..600857b 100644
--- a/lib/route/addr.c
+++ b/lib/route/addr.c
@@ -625,7 +625,7 @@ nla_put_failure:
 int rtnl_addr_build_add_request(struct rtnl_addr *addr, int flags,
 				struct nl_msg **result)
 {
-	int required = ADDR_ATTR_IFINDEX | ADDR_ATTR_FAMILY |
+	uint32_t required = ADDR_ATTR_IFINDEX | ADDR_ATTR_FAMILY |
 		       ADDR_ATTR_PREFIXLEN | ADDR_ATTR_LOCAL;
 
 	if ((addr->ce_mask & required) != required)
@@ -698,7 +698,7 @@ int rtnl_addr_add(struct nl_sock *sk, struct rtnl_addr *addr, int flags)
 int rtnl_addr_build_delete_request(struct rtnl_addr *addr, int flags,
 				   struct nl_msg **result)
 {
-	int required = ADDR_ATTR_IFINDEX | ADDR_ATTR_FAMILY;
+	uint32_t required = ADDR_ATTR_IFINDEX | ADDR_ATTR_FAMILY;
 
 	if ((addr->ce_mask & required) != required)
 		return -NLE_MISSING_ATTR;
diff --git a/lib/route/class.c b/lib/route/class.c
index 2a9606b..399e8a2 100644
--- a/lib/route/class.c
+++ b/lib/route/class.c
@@ -100,7 +100,7 @@ void rtnl_class_put(struct rtnl_class *class)
 static int class_build(struct rtnl_class *class, int type, int flags,
 		       struct nl_msg **result)
 {
-	int needed = TCA_ATTR_PARENT | TCA_ATTR_HANDLE;
+	uint32_t needed = TCA_ATTR_PARENT | TCA_ATTR_HANDLE;
 
 	if ((class->ce_mask & needed) == needed &&
 	    TC_H_MAJ(class->c_parent) && TC_H_MAJ(class->c_handle) &&
@@ -196,7 +196,7 @@ int rtnl_class_build_delete_request(struct rtnl_class *class, struct nl_msg **re
 {
 	struct nl_msg *msg;
 	struct tcmsg tchdr;
-	int required = TCA_ATTR_IFINDEX | TCA_ATTR_HANDLE;
+	uint32_t required = TCA_ATTR_IFINDEX | TCA_ATTR_HANDLE;
 
 	if ((class->ce_mask & required) != required) {
 		APPBUG("ifindex and handle must be specified");
diff --git a/lib/route/classid.c b/lib/route/classid.c
index e1880af..a128773 100644
--- a/lib/route/classid.c
+++ b/lib/route/classid.c
@@ -154,7 +154,8 @@ char *rtnl_tc_handle2str(uint32_t handle, char *buf, size_t len)
 int rtnl_tc_str2handle(const char *str, uint32_t *res)
 {
 	char *colon, *end;
-	uint32_t h, err;
+	uint32_t h;
+	int err;
 
 	if (!strcasecmp(str, "root")) {
 		*res = TC_H_ROOT;
diff --git a/lib/route/cls.c b/lib/route/cls.c
index fb2e9be..35a010a 100644
--- a/lib/route/cls.c
+++ b/lib/route/cls.c
@@ -37,7 +37,7 @@ static int cls_build(struct rtnl_cls *cls, int type, int flags,
 {
 	int err, prio, proto;
 	struct tcmsg *tchdr;
-	int required = TCA_ATTR_IFINDEX;
+	uint32_t required = TCA_ATTR_IFINDEX;
 
 	if ((cls->ce_mask & required) != required) {
 		APPBUG("ifindex must be specified");
@@ -251,7 +251,7 @@ int rtnl_cls_change(struct nl_sock *sk, struct rtnl_cls *cls, int flags)
 int rtnl_cls_build_delete_request(struct rtnl_cls *cls, int flags,
 				  struct nl_msg **result)
 {
-	int required = CLS_ATTR_PRIO;
+	uint32_t required = CLS_ATTR_PRIO;
 
 	if ((cls->ce_mask & required) != required) {
 		APPBUG("prio must be specified");
diff --git a/lib/route/cls/u32.c b/lib/route/cls/u32.c
index 331e714..d3e326d 100644
--- a/lib/route/cls/u32.c
+++ b/lib/route/cls/u32.c
@@ -116,7 +116,7 @@ static int u32_msg_parser(struct rtnl_tc *tc, void *data)
 
 	if (tb[TCA_U32_PCNT]) {
 		struct tc_u32_sel *sel;
-		int pcnt_size;
+		size_t pcnt_size;
 
 		if (!tb[TCA_U32_SEL]) {
 			err = -NLE_MISSING_ATTR;
diff --git a/lib/route/link/vlan.c b/lib/route/link/vlan.c
index a30ff77..a9bf955 100644
--- a/lib/route/link/vlan.c
+++ b/lib/route/link/vlan.c
@@ -114,7 +114,7 @@ static int vlan_parse(struct rtnl_link *link, struct nlattr *data,
 				return -NLE_INVAL;
 
 			map = nla_data(nla);
-			if (map->from < 0 || map->from > VLAN_PRIO_MAX) {
+			if (map->from > VLAN_PRIO_MAX) {
 				return -NLE_INVAL;
 			}
 
@@ -181,7 +181,8 @@ static void vlan_dump_line(struct rtnl_link *link, struct nl_dump_params *p)
 static void vlan_dump_details(struct rtnl_link *link, struct nl_dump_params *p)
 {
 	struct vlan_info *vi = link->l_info;
-	int i, printed;
+	int printed;
+	uint32_t i;
 	char buf[64];
 
 	rtnl_link_vlan_flags2str(vi->vi_flags, buf, sizeof(buf));
@@ -291,7 +292,7 @@ static int vlan_put_attrs(struct nl_msg *msg, struct rtnl_link *link)
 	if (vi->vi_mask & VLAN_HAS_EGRESS_QOS) {
 		struct ifla_vlan_qos_mapping map;
 		struct nlattr *qos;
-		int i;
+		uint32_t i;
 
 		if (!(qos = nla_nest_start(msg, IFLA_VLAN_EGRESS_QOS)))
 			goto nla_put_failure;
diff --git a/lib/route/qdisc.c b/lib/route/qdisc.c
index e5a8aa0..3d618c6 100644
--- a/lib/route/qdisc.c
+++ b/lib/route/qdisc.c
@@ -275,7 +275,7 @@ int rtnl_qdisc_build_delete_request(struct rtnl_qdisc *qdisc,
 {
 	struct nl_msg *msg;
 	struct tcmsg tchdr;
-	int required = TCA_ATTR_IFINDEX | TCA_ATTR_PARENT;
+	uint32_t required = TCA_ATTR_IFINDEX | TCA_ATTR_PARENT;
 
 	if ((qdisc->ce_mask & required) != required) {
 		APPBUG("ifindex and parent must be specified");
diff --git a/lib/route/qdisc/netem.c b/lib/route/qdisc/netem.c
index 3e5ba52..ddd404d 100644
--- a/lib/route/qdisc/netem.c
+++ b/lib/route/qdisc/netem.c
@@ -827,7 +827,8 @@ int rtnl_netem_set_delay_distribution(struct rtnl_qdisc *qdisc, const char *dist
 		BUG();
 		
 	FILE *f;
-	int i, n = 0;
+	int n = 0;
+	size_t i;
 	size_t len = 2048;
 	char *line;
 	char name[NAME_MAX];
diff --git a/lib/route/route_obj.c b/lib/route/route_obj.c
index ac634ae..685a926 100644
--- a/lib/route/route_obj.c
+++ b/lib/route/route_obj.c
@@ -724,7 +724,7 @@ void rtnl_route_foreach_nexthop(struct rtnl_route *r,
 struct rtnl_nexthop *rtnl_route_nexthop_n(struct rtnl_route *r, int n)
 {
 	struct rtnl_nexthop *nh;
-	int i;
+	uint32_t i;
     
 	if (r->ce_mask & ROUTE_ATTR_MULTIPATH && r->rt_nr_nh > n) {
 		i = 0;
diff --git a/lib/utils.c b/lib/utils.c
index efb2cf4..467fd7f 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -305,7 +305,7 @@ static const struct {
  */
 char *nl_size2str(const size_t size, char *buf, const size_t len)
 {
-	int i;
+	size_t i;
 
 	for (i = 0; i < ARRAY_SIZE(size_units); i++) {
 		if (size >= size_units[i].limit) {
@@ -515,10 +515,12 @@ int nl_str2msec(const char *str, uint64_t *result)
  */
 char * nl_msec2str(uint64_t msec, char *buf, size_t len)
 {
-	int i, split[5];
-	char *units[] = {"d", "h", "m", "s", "msec"};
+	uint64_t split[5];
+	size_t i;
+	static const char *units[5] = {"d", "h", "m", "s", "msec"};
+	char * const buf_orig = buf;
 
-#define _SPLIT(idx, unit) if ((split[idx] = msec / unit) > 0) msec %= unit
+#define _SPLIT(idx, unit) if ((split[idx] = msec / unit)) msec %= unit
 	_SPLIT(0, 86400000);	/* days */
 	_SPLIT(1, 3600000);	/* hours */
 	_SPLIT(2, 60000);	/* minutes */
@@ -526,18 +528,17 @@ char * nl_msec2str(uint64_t msec, char *buf, size_t len)
 #undef  _SPLIT
 	split[4] = msec;
 
-	memset(buf, 0, len);
-
-	for (i = 0; i < ARRAY_SIZE(split); i++) {
-		if (split[i] > 0) {
-			char t[64];
-			snprintf(t, sizeof(t), "%s%d%s",
-				 strlen(buf) ? " " : "", split[i], units[i]);
-			strncat(buf, t, len - strlen(buf) - 1);
-		}
+	for (i = 0; i < ARRAY_SIZE(split) && len; i++) {
+		int l;
+		if (split[i] == 0)
+			continue;
+		l = snprintf(buf, len, "%s%" PRIu64 "%s",
+			(buf==buf_orig) ? "" : " ", split[i], units[i]);
+		buf += l;
+		len -= l;
 	}
 
-	return buf;
+	return buf_orig;
 }
 
 /** @} */
@@ -929,7 +930,7 @@ void __trans_list_clear(struct nl_list_head *head)
 char *__type2str(int type, char *buf, size_t len,
 		 const struct trans_tbl *tbl, size_t tbl_len)
 {
-	int i;
+	size_t i;
 	for (i = 0; i < tbl_len; i++) {
 		if (tbl[i].i == type) {
 			snprintf(buf, len, "%s", tbl[i].a);
@@ -960,7 +961,7 @@ char *__list_type2str(int type, char *buf, size_t len,
 char *__flags2str(int flags, char *buf, size_t len,
 		  const struct trans_tbl *tbl, size_t tbl_len)
 {
-	int i;
+	size_t i;
 	int tmp = flags;
 
 	memset(buf, 0, len);
@@ -981,7 +982,7 @@ int __str2type(const char *buf, const struct trans_tbl *tbl, size_t tbl_len)
 {
 	unsigned long l;
 	char *end;
-	int i;
+	size_t i;
 
 	if (*buf == '\0')
 		return -NLE_INVAL;
@@ -1020,7 +1021,9 @@ int __list_str2type(const char *buf, struct nl_list_head *head)
 
 int __str2flags(const char *buf, const struct trans_tbl *tbl, size_t tbl_len)
 {
-	int i, flags = 0, len;
+	int flags = 0;
+	size_t i;
+	size_t len; /* ptrdiff_t ? */
 	char *p = (char *) buf, *t;
 
 	for (;;) {
diff --git a/src/lib/route.c b/src/lib/route.c
index 05cb2ad..f2d6c60 100644
--- a/src/lib/route.c
+++ b/src/lib/route.c
@@ -198,12 +198,16 @@ void nl_cli_route_parse_table(struct rtnl_route *route, char *arg)
 {
 	unsigned long lval;
 	char *endptr;
+	int table;
 
 	lval = strtoul(arg, &endptr, 0);
 	if (endptr == arg) {
-		if ((lval = rtnl_route_str2table(arg)) < 0)
+		if ((table = rtnl_route_str2table(arg)) < 0)
 			nl_cli_fatal(EINVAL, "Unknown table name \"%s\"", arg);
 	}
+	else {
+		table = lval;
+	}
 
 	rtnl_route_set_table(route, lval);
 }
@@ -233,16 +237,20 @@ void nl_cli_route_parse_protocol(struct rtnl_route *route, char *arg)
 {
 	unsigned long lval;
 	char *endptr;
+	int proto;
 
 	lval = strtoul(arg, &endptr, 0);
 	if (endptr == arg) {
-		if ((lval = rtnl_route_str2proto(arg)) < 0)
+		if ((proto = rtnl_route_str2proto(arg)) < 0)
 			nl_cli_fatal(EINVAL,
 				     "Unknown routing protocol name \"%s\"",
 				     arg);
 	}
+	else {
+		proto = lval;
+	}
 
-	rtnl_route_set_protocol(route, lval);
+	rtnl_route_set_protocol(route, proto);
 }
 
 void nl_cli_route_parse_type(struct rtnl_route *route, char *arg)