[LEDE-DEV] [PATCH] libubox: Fix -Wsign-compare and sign conversion warnings

[Rosen Penev]

While at it, also add -Wextra and -Wno-unused-parameter to the
CFLAGS. Compile tested on 32 and 64-bit x86.

Signed-off by: Rosen Penev <rosenp at gmail.com>
---
 CMakeLists.txt |  3 +--
 base64.c       |  6 +++---
 blob.c         | 12 ++++++------
 blob.h         |  8 ++++----
 blobmsg.c      |  2 +-
 kvlist.c       |  2 +-
 usock.c        |  6 +++---
 7 files changed, 19 insertions(+), 20 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 57804cf..44032df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,8 +3,7 @@ INCLUDE(CheckLibraryExists)
 INCLUDE(CheckFunctionExists)
 
 PROJECT(ubox C)
-ADD_DEFINITIONS(-Os -Wall -Werror --std=gnu99 -g3 -Wmissing-declarations)
-
+ADD_DEFINITIONS(-Os -Wall -Wextra -Werror --std=gnu99 -g3 -Wmissing-declarations -Wno-unused-parameter)
 OPTION(BUILD_LUA "build Lua plugin" ON)
 OPTION(BUILD_EXAMPLES "build examples" ON)
 
diff --git a/base64.c b/base64.c
index 4186ce8..f4cb5c6 100644
--- a/base64.c
+++ b/base64.c
@@ -142,7 +142,6 @@ int b64_encode(const void *_src, size_t srclength,
 	size_t datalength = 0;
 	u_char input[3] = {0};
 	u_char output[4];
-	int i;
 
 	while (2 < srclength) {
 		input[0] = *src++;
@@ -167,7 +166,7 @@ int b64_encode(const void *_src, size_t srclength,
 	if (0 != srclength) {
 		/* Get what's left. */
 		input[0] = input[1] = input[2] = '\0';
-		for (i = 0; i < srclength; i++)
+		for (size_t i = 0; i < srclength; i++)
 			input[i] = *src++;
 
 		output[0] = input[0] >> 2;
@@ -200,7 +199,8 @@ int b64_decode(const void *_src, void *dest, size_t targsize)
 {
 	const char *src = _src;
 	unsigned char *target = dest;
-	int tarindex, state, ch;
+	int state, ch;
+	size_t tarindex;
 	u_char nextbyte;
 	char *pos;
 
diff --git a/blob.c b/blob.c
index 03d5e9c..45c3204 100644
--- a/blob.c
+++ b/blob.c
@@ -186,7 +186,7 @@ blob_nest_end(struct blob_buf *buf, void *cookie)
 	buf->head = attr;
 }
 
-static const int blob_type_minlen[BLOB_ATTR_LAST] = {
+static const size_t blob_type_minlen[BLOB_ATTR_LAST] = {
 	[BLOB_ATTR_STRING] = 1,
 	[BLOB_ATTR_INT8] = sizeof(uint8_t),
 	[BLOB_ATTR_INT16] = sizeof(uint16_t),
@@ -222,18 +222,18 @@ blob_parse(struct blob_attr *attr, struct blob_attr **data, const struct blob_at
 {
 	struct blob_attr *pos;
 	int found = 0;
-	int rem;
+	unsigned int rem;
 
 	memset(data, 0, sizeof(struct blob_attr *) * max);
 	blob_for_each_attr(pos, attr, rem) {
-		int id = blob_id(pos);
-		int len = blob_len(pos);
+		unsigned int id = blob_id(pos);
+		unsigned int len = blob_len(pos);
 
-		if (id >= max)
+		if ((int)id >= max)
 			continue;
 
 		if (info) {
-			int type = info[id].type;
+			unsigned int type = info[id].type;
 
 			if (type < BLOB_ATTR_LAST) {
 				if (!blob_check_type(blob_data(pos), len, type))
diff --git a/blob.h b/blob.h
index a092f5d..3f069da 100644
--- a/blob.h
+++ b/blob.h
@@ -154,25 +154,25 @@ blob_get_u64(const struct blob_attr *attr)
 static inline int8_t
 blob_get_int8(const struct blob_attr *attr)
 {
-	return blob_get_u8(attr);
+	return (int8_t)blob_get_u8(attr);
 }
 
 static inline int16_t
 blob_get_int16(const struct blob_attr *attr)
 {
-	return blob_get_u16(attr);
+	return (int16_t)blob_get_u16(attr);
 }
 
 static inline int32_t
 blob_get_int32(const struct blob_attr *attr)
 {
-	return blob_get_u32(attr);
+	return (int32_t)blob_get_u32(attr);
 }
 
 static inline int64_t
 blob_get_int64(const struct blob_attr *attr)
 {
-	return blob_get_u64(attr);
+	return (int64_t)blob_get_u64(attr);
 }
 
 static inline const char *
diff --git a/blobmsg.c b/blobmsg.c
index c2bb717..1eddf23 100644
--- a/blobmsg.c
+++ b/blobmsg.c
@@ -67,7 +67,7 @@ int blobmsg_check_array(const struct blob_attr *attr, int type)
 {
 	struct blob_attr *cur;
 	bool name;
-	int rem;
+	unsigned int rem;
 	int size = 0;
 
 	switch (blobmsg_type(attr)) {
diff --git a/kvlist.c b/kvlist.c
index a7b6ea0..66fc8cd 100644
--- a/kvlist.c
+++ b/kvlist.c
@@ -75,7 +75,7 @@ bool kvlist_set(struct kvlist *kv, const char *name, const void *data)
 {
 	struct kvlist_node *node;
 	char *name_buf;
-	int len = kv->get_len(kv, data);
+	size_t len = kv->get_len(kv, data);
 
 	node = calloc_a(sizeof(struct kvlist_node) + len,
 		&name_buf, strlen(name) + 1);
diff --git a/usock.c b/usock.c
index 0ce5390..c159a76 100644
--- a/usock.c
+++ b/usock.c
@@ -33,7 +33,7 @@
 #include "usock.h"
 #include "utils.h"
 
-static void usock_set_flags(int sock, unsigned int type)
+static void usock_set_flags(int sock, int type)
 {
 	if (!(type & USOCK_NOCLOEXEC))
 		fcntl(sock, F_SETFD, fcntl(sock, F_GETFD) | FD_CLOEXEC);
@@ -42,7 +42,7 @@ static void usock_set_flags(int sock, unsigned int type)
 		fcntl(sock, F_SETFL, fcntl(sock, F_GETFL) | O_NONBLOCK);
 }
 
-static int usock_connect(int type, struct sockaddr *sa, int sa_len, int family, int socktype, bool server)
+static int usock_connect(int type, struct sockaddr *sa, socklen_t sa_len, int family, int socktype, bool server)
 {
 	int sock;
 
@@ -103,7 +103,7 @@ usock_inet_notimeout(int type, struct addrinfo *result, void *addr)
 	return -1;
 }
 
-static int poll_restart(struct pollfd *fds, int nfds, int timeout)
+static int poll_restart(struct pollfd *fds, nfds_t nfds, int timeout)
 {
 	struct timespec ts, cur;
 	int msec = timeout % 1000;
-- 
2.9.3