more -Wall warning fixes from Cristian Ionescu-Idbohrn.

This time it resulted in small code changes:

function                                             old     new   delta
nexpr                                                820     828      +8
tail_main                                           1200    1202      +2
wrapf                                                166     167      +1
parse_mount_options                                  227     209     -18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 11/-18)             Total: -7 bytes

27 files changed, 69 insertions, 61 deletions

diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c
index 29aed18..0be29b7 100644
--- a/archival/libunarchive/get_header_tar.c
+++ b/archival/libunarchive/get_header_tar.c
@@ -138,12 +138,12 @@ char get_header_tar(archive_handle_t *archive_handle)
 		/* tar gz/bz autodetect: check for gz/bz2 magic.
 		 * If it is the very first block, and we see the magic,
 		 * we can switch to get_header_tar_gz/bz2/lzma().
-		 * Needs seekable fd. I wish recv(MSG_PEEK) would work
+		 * Needs seekable fd. I wish recv(MSG_PEEK) works
 		 * on any fd... */
 		if (not_first)
 			goto err;
 #if ENABLE_FEATURE_TAR_GZIP
-		if (tar.name[0] == 0x1f && tar.name[1] == 0x8b) { /* gzip */
+		if (tar.name[0] == 0x1f && tar.name[1] == (char)0x8b) { /* gzip */
 			get_header_ptr = get_header_tar_gz;
 		} else
 #endif
diff --git a/coreutils/basename.c b/coreutils/basename.c
index 2216182..a3085ed 100644
--- a/coreutils/basename.c
+++ b/coreutils/basename.c
@@ -48,5 +48,5 @@ int basename_main(int argc, char **argv)
 
 	/* puts(s) will do, but we can do without stdio this way: */
 	s[m++] = '\n';
-	return full_write(STDOUT_FILENO, s, m) == m;
+	return full_write(STDOUT_FILENO, s, m) == (ssize_t)m;
 }
diff --git a/coreutils/cut.c b/coreutils/cut.c
index 7a44d10..1634fc8 100644
--- a/coreutils/cut.c
+++ b/coreutils/cut.c
@@ -64,7 +64,7 @@ static void cut_file(FILE *file, char delim)
 			/* print the chars specified in each cut list */
 			for (; cl_pos < nlists; cl_pos++) {
 				spos = cut_lists[cl_pos].startpos;
-				while (spos < strlen(line)) {
+				while (spos < (int)strlen(line)) {
 					if (!printed[spos]) {
 						printed[spos] = 'X';
 						putchar(line[spos]);
@@ -80,12 +80,12 @@ static void cut_file(FILE *file, char delim)
 
 			/* get out if we have no more lists to process or if the lines
 			 * are lower than what we're interested in */
-			if (linenum < spos || cl_pos >= nlists)
+			if (((int)linenum < spos) || (cl_pos >= nlists))
 				goto next_line;
 
 			/* if the line we're looking for is lower than the one we were
 			 * passed, it means we displayed it already, so move on */
-			while (spos < linenum) {
+			while (spos < (int)linenum) {
 				spos++;
 				/* go to the next list if we're at the end of this one */
 				if (spos > cut_lists[cl_pos].endpos
@@ -97,7 +97,7 @@ static void cut_file(FILE *file, char delim)
 					spos = cut_lists[cl_pos].startpos;
 					/* get out if the current line is lower than the one
 					 * we just became interested in */
-					if (linenum < spos)
+					if ((int)linenum < spos)
 						goto next_line;
 				}
 			}
diff --git a/coreutils/dd.c b/coreutils/dd.c
index 4d1ef0b..6b66366 100644
--- a/coreutils/dd.c
+++ b/coreutils/dd.c
@@ -65,7 +65,7 @@ static bool write_and_stats(const void *buf, size_t len, size_t obs,
 	ssize_t n = full_write_or_warn(buf, len, filename);
 	if (n < 0)
 		return 1;
-	if (n == obs)
+	if ((size_t)n == obs)
 		G.out_full++;
 	else if (n) /* > 0 */
 		G.out_part++;
@@ -312,7 +312,7 @@ int dd_main(int argc ATTRIBUTE_UNUSED, char **argv)
 			while (n) {
 				size_t d = obs - oc;
 
-				if (d > n)
+				if (d > (size_t)n)
 					d = n;
 				memcpy(obuf + oc, tmp, d);
 				n -= d;
diff --git a/coreutils/expand.c b/coreutils/expand.c
index a7ac8ea..af2ef86 100644
--- a/coreutils/expand.c
+++ b/coreutils/expand.c
@@ -41,7 +41,7 @@ static void expand(FILE *file, unsigned tab_size, unsigned opt)
 	char *line;
 	char *ptr;
 	int convert;
-	int pos;
+	unsigned pos;
 
 	/* Increment tab_size by 1 locally.*/
 	tab_size++;
@@ -80,7 +80,7 @@ static void unexpand(FILE *file, unsigned int tab_size, unsigned opt)
 	int convert;
 	int pos;
 	int i = 0;
-	int column = 0;
+	unsigned column = 0;
 
 	while ((line = xmalloc_fgets(file)) != NULL) {
 		convert = 1;
diff --git a/coreutils/sort.c b/coreutils/sort.c
index a54be72..12b463a 100644
--- a/coreutils/sort.c
+++ b/coreutils/sort.c
@@ -59,7 +59,8 @@ static struct sort_key {
 
 static char *get_key(char *str, struct sort_key *key, int flags)
 {
-	int start = 0, end = 0, len, i, j;
+	int start = 0, end = 0, len, j;
+	unsigned i;
 
 	/* Special case whole string, so we don't have to make a copy */
 	if (key->range[0] == 1 && !key->range[1] && !key->range[2] && !key->range[3]
diff --git a/coreutils/stty.c b/coreutils/stty.c
index 298fb5b..a17955a 100644
--- a/coreutils/stty.c
+++ b/coreutils/stty.c
@@ -710,7 +710,7 @@ static void wrapf(const char *message, ...)
 {
 	char buf[128];
 	va_list args;
-	int buflen;
+	unsigned buflen;
 
 	va_start(args, message);
 	buflen = vsnprintf(buf, sizeof(buf), message, args);
diff --git a/coreutils/tail.c b/coreutils/tail.c
index 2f997a9..2505fc3 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -92,7 +92,8 @@ int tail_main(int argc, char **argv)
 	size_t tailbufsize;
 	int taillen = 0;
 	int newlines_seen = 0;
-	int nfiles, nread, nwrite, seen, i, opt;
+	int nfiles, nread, nwrite, i, opt;
+	unsigned seen;
 
 	int *fds;
 	char *s, *buf;
@@ -210,7 +211,7 @@ int tail_main(int argc, char **argv)
 			} else if (count) {
 				if (COUNT_BYTES) {
 					taillen += nread;
-					if (taillen > count) {
+					if (taillen > (int)count) {
 						memmove(tailbuf, tailbuf + taillen - count, count);
 						taillen = count;
 					}
@@ -225,7 +226,7 @@ int tail_main(int argc, char **argv)
 						}
 					} while (k);
 
-					if (newlines_seen + newlines_in_buf < count) {
+					if (newlines_seen + newlines_in_buf < (int)count) {
 						newlines_seen += newlines_in_buf;
 						taillen += nread;
 					} else {
@@ -243,7 +244,7 @@ int tail_main(int argc, char **argv)
 						memmove(tailbuf, s, taillen);
 						newlines_seen = count - extra;
 					}
-					if (tailbufsize < taillen + BUFSIZ) {
+					if (tailbufsize < (size_t)taillen + BUFSIZ) {
 						tailbufsize = taillen + BUFSIZ;
 						tailbuf = xrealloc(tailbuf, tailbufsize);
 					}
diff --git a/coreutils/test.c b/coreutils/test.c
index 3c725a2..270ca21 100644
--- a/coreutils/test.c
+++ b/coreutils/test.c
@@ -412,7 +412,7 @@ static int test_eaccess(char *path, int mode)
 static int filstat(char *nm, enum token mode)
 {
 	struct stat s;
-	int i = i; /* gcc 3.x thinks it can be used uninitialized */
+	unsigned i = i; /* gcc 3.x thinks it can be used uninitialized */
 
 	if (mode == FILSYM) {
 #ifdef S_IFLNK
diff --git a/coreutils/tr.c b/coreutils/tr.c
index 0d32849..8b2d308 100644
--- a/coreutils/tr.c
+++ b/coreutils/tr.c
@@ -219,7 +219,7 @@ int tr_main(int argc ATTRIBUTE_UNUSED, char **argv)
 
 	for (;;) {
 		/* If we're out of input, flush output and read more input. */
-		if (in_index == read_chars) {
+		if ((ssize_t)in_index == read_chars) {
 			if (out_index) {
 				xwrite(STDOUT_FILENO, (char *)output, out_index);
 				out_index = 0;
diff --git a/debianutils/start_stop_daemon.c b/debianutils/start_stop_daemon.c
index 467deed..094b3b1 100644
--- a/debianutils/start_stop_daemon.c
+++ b/debianutils/start_stop_daemon.c
@@ -126,7 +126,7 @@ static int pid_is_user(int pid)
 	sprintf(buf, "/proc/%u", pid);
 	if (stat(buf, &sb) != 0)
 		return 0;
-	return (sb.st_uid == user_id);
+	return (sb.st_uid == (uid_t)user_id);
 }
 
 static int pid_is_cmd(pid_t pid)
diff --git a/editors/awk.c b/editors/awk.c
index f04ea5c..fef3246 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -676,7 +676,7 @@ static char nextchar(char **s)
 	return c;
 }
 
-static int ALWAYS_INLINE isalnum_(int c)
+static ALWAYS_INLINE int isalnum_(int c)
 {
 	return (isalnum(c) || c == '_');
 }
@@ -1682,7 +1682,7 @@ static void hashwalk_init(var *v, xhash *array)
 {
 	char **w;
 	hash_item *hi;
-	int i;
+	unsigned i;
 
 	if (v->type & VF_WALK)
 		free(v->x.walker);
@@ -1996,7 +1996,7 @@ static var *exec_builtin(node *op, var *res)
 	}
 
 	nargs = i;
-	if (nargs < (info >> 30))
+	if ((uint32_t)nargs < (info >> 30))
 		syntax_error(EMSG_TOO_FEW_ARGS);
 
 	switch (info & OPNMASK) {
diff --git a/editors/sed.c b/editors/sed.c
index f858845..817840d 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -628,7 +628,7 @@ static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
 {
 	char *oldline = *line;
 	int altered = 0;
-	int match_count = 0;
+	unsigned match_count = 0;
 	regex_t *current_regex;
 
 	/* Handle empty regex. */
@@ -665,7 +665,9 @@ static int do_subst_command(sed_cmd_t *sed_cmd, char **line)
 
 		/* If we aren't interested in this match, output old line to
 		   end of match and continue */
-		if (sed_cmd->which_match && sed_cmd->which_match != match_count) {
+		if (sed_cmd->which_match
+		 && (sed_cmd->which_match != match_count)
+		) {
 			for (i = 0; i < G.regmatch[0].rm_eo; i++)
 				pipe_putc(*oldline++);
 			continue;
diff --git a/editors/vi.c b/editors/vi.c
index 4e5a5ac..5013d0d 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2239,7 +2239,9 @@ static char readit(void)	// read (maybe cursor) key from stdin
 			pfd[0].events = POLLIN;
 			// keep reading while there are input chars, and room in buffer
 			// for a complete ESC sequence (assuming 8 chars is enough)
-			while (safe_poll(pfd, 1, 0) > 0 && n <= (sizeof(readbuffer) - 8)) {
+			while ((safe_poll(pfd, 1, 0) > 0)
+			 && ((size_t)n <= (sizeof(readbuffer) - 8))
+			) {
 				// read the rest of the ESC string
 				int r = safe_read(0, readbuffer + n, sizeof(readbuffer) - n);
 				if (r > 0)
diff --git a/findutils/xargs.c b/findutils/xargs.c
index ee16ea6..d1cf192 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -233,7 +233,7 @@ static xlist_t *process_stdin(xlist_t *list_arg,
 		}
 		if (s == NULL)
 			s = p = buf;
-		if ((p - buf) >= mc)
+		if ((size_t)(p - buf) >= mc)
 			bb_error_msg_and_die("argument line too long");
 		*p++ = (c == EOF ? '\0' : c);
 		if (c == EOF) { /* word's delimiter or EOF detected */
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index d1a7a4b..62dcc55 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -262,7 +262,7 @@ static void input_backward(unsigned num)
 		return;
 	cursor -= num;
 
-	if (cmdedit_x >= num) {
+	if ((unsigned)cmdedit_x >= num) {
 		cmdedit_x -= num;
 		if (num <= 4) {
 			/* This is longer by 5 bytes on x86.
@@ -321,7 +321,7 @@ static void input_delete(int save)
 {
 	int j = cursor;
 
-	if (j == command_len)
+	if (j == (int)command_len)
 		return;
 
 #if ENABLE_FEATURE_EDITING_VI
@@ -830,7 +830,7 @@ static void input_tab(smallint *lastWasTab)
 
 	if (!*lastWasTab) {
 		char *tmp, *tmp1;
-		int len_found;
+		size_t len_found;
 /*		char matchBuf[MAX_LINELEN]; */
 #define matchBuf (S.input_tab__matchBuf)
 		int find_type;
@@ -1787,7 +1787,7 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
 			if (vi_cmdmode)  /* Don't self-insert */
 				break;
 #endif
-			if (command_len >= (maxsize - 2))        /* Need to leave space for enter */
+			if ((int)command_len >= (maxsize - 2))        /* Need to leave space for enter */
 				break;
 
 			command_len++;
diff --git a/libbb/md5.c b/libbb/md5.c
index 56f9727..8d4b9fe 100644
--- a/libbb/md5.c
+++ b/libbb/md5.c
@@ -383,7 +383,7 @@ void md5_hash(const void *buffer, size_t len, md5_ctx_t *ctx)
 	// Process all input.
 
 	while (len) {
-		int i = 64 - ctx->buflen;
+		unsigned i = 64 - ctx->buflen;
 
 		// Copy data into aligned buffer.
 
diff --git a/libbb/read.c b/libbb/read.c
index 288358d..fb903c1 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -111,7 +111,7 @@ void xread(int fd, void *buf, size_t count)
 {
 	if (count) {
 		ssize_t size = full_read(fd, buf, count);
-		if (size != count)
+		if ((size_t)size != count)
 			bb_error_msg_and_die("short read");
 	}
 }
@@ -160,7 +160,7 @@ char *xmalloc_reads(int fd, char *buf, size_t *maxsz_p)
 
 	goto jump_in;
 	while (sz < maxsz) {
-		if (p - buf == sz) {
+		if ((size_t)(p - buf) == sz) {
  jump_in:
 			buf = xrealloc(buf, sz + 128);
 			p = buf + sz;
diff --git a/libbb/u_signal_names.c b/libbb/u_signal_names.c
index 97e9949..7a0f75d 100644
--- a/libbb/u_signal_names.c
+++ b/libbb/u_signal_names.c
@@ -130,7 +130,7 @@ int get_signum(const char *name)
 		return i;
 	if (strncasecmp(name, "SIG", 3) == 0)
 		name += 3;
-	for (i = 0; i < ARRAY_SIZE(signals); i++)
+	for (i = 0; (size_t)i < ARRAY_SIZE(signals); i++)
 		if (strcasecmp(name, signals[i]) == 0)
 			return i;
 
@@ -172,7 +172,7 @@ void print_signames(void)
 {
 	int signo;
 
-	for (signo = 1; signo < ARRAY_SIZE(signals); signo++) {
+	for (signo = 1; (size_t)signo < ARRAY_SIZE(signals); signo++) {
 		const char *name = signals[signo];
 		if (name[0])
 			puts(name);
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index d3fb39f..105939b 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -204,7 +204,7 @@ void xwrite(int fd, const void *buf, size_t count)
 {
 	if (count) {
 		ssize_t size = full_write(fd, buf, count);
-		if (size != count)
+		if ((size_t)size != count)
 			bb_error_msg_and_die("short write");
 	}
 }
diff --git a/miscutils/crond.c b/miscutils/crond.c
index 98dd22d..0b2d558 100644
--- a/miscutils/crond.c
+++ b/miscutils/crond.c
@@ -145,7 +145,7 @@ static void crondlog(const char *ctl, ...)
 	int level = (ctl[0] & 0x1f);
 
 	va_start(va, ctl);
-	if (level >= LogLevel) {
+	if (level >= (int)LogLevel) {
 		/* Debug mode: all to (non-redirected) stderr, */
 		/* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
 		if (!DebugOpt && LogFile) {
@@ -423,7 +423,7 @@ static char *ParseField(char *user, char *ary, int modvalue, int off,
 
 static void FixDayDow(CronLine *line)
 {
-	int i;
+	size_t i;
 	int weekUsed = 0;
 	int daysUsed = 0;
 
diff --git a/miscutils/eject.c b/miscutils/eject.c
index 91cf98f..aa22a3a 100644
--- a/miscutils/eject.c
+++ b/miscutils/eject.c
@@ -38,7 +38,7 @@ static void eject_scsi(const char *dev)
 		{ START_STOP, 0, 0, 0, 2, 0 }
 	};
 
-	int i;
+	unsigned i;
 	unsigned char sense_buffer[32];
 	unsigned char inqBuff[2];
 	sg_io_hdr_t io_hdr;
diff --git a/util-linux/mdev.c b/util-linux/mdev.c
index 4fff20d..14aa593 100644
--- a/util-linux/mdev.c
+++ b/util-linux/mdev.c
@@ -120,8 +120,11 @@ static void make_device(char *path, int delete)
 
 				/* If not this device, skip rest of line */
 				/* (regexec returns whole pattern as "range" 0) */
-				if (result || off[0].rm_so || off[0].rm_eo != strlen(device_name))
+				if (result || off[0].rm_so
+				 || ((int)off[0].rm_eo != (int)strlen(device_name))
+				) {
 					goto next_line;
+				}
 			}
 
 			/* This line matches: stop parsing the file
diff --git a/util-linux/mount.c b/util-linux/mount.c
index 4b8aea8..292f877 100644
--- a/util-linux/mount.c
+++ b/util-linux/mount.c
@@ -307,7 +307,7 @@ static long parse_mount_options(char *options, char **unrecognized)
 
 	// Loop through options
 	for (;;) {
-		int i;
+		size_t i;
 		char *comma = strchr(options, ',');
 		const char *option_str = mount_option_str;
 
@@ -1004,7 +1004,7 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
 			bb_herror_msg("%s", hostname);
 			goto fail;
 		}
-		if (hp->h_length > sizeof(struct in_addr)) {
+		if ((size_t)hp->h_length > sizeof(struct in_addr)) {
 			bb_error_msg("got bad hp->h_length");
 			hp->h_length = sizeof(struct in_addr);
 		}
@@ -1279,15 +1279,14 @@ static int nfsmount(struct mntent *mp, long vfsflags, char *filteropts)
 			if (hp == NULL) {
 				bb_herror_msg("%s", mounthost);
 				goto fail;
-			} else {
-				if (hp->h_length > sizeof(struct in_addr)) {
-					bb_error_msg("got bad hp->h_length?");
-					hp->h_length = sizeof(struct in_addr);
-				}
-				mount_server_addr.sin_family = AF_INET;
-				memcpy(&mount_server_addr.sin_addr,
-						hp->h_addr, hp->h_length);
 			}
+			if ((size_t)hp->h_length > sizeof(struct in_addr)) {
+				bb_error_msg("got bad hp->h_length");
+				hp->h_length = sizeof(struct in_addr);
+			}
+			mount_server_addr.sin_family = AF_INET;
+			memcpy(&mount_server_addr.sin_addr,
+						hp->h_addr, hp->h_length);
 		}
 	}
 
diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index c030b99..bae695b 100644
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -13,15 +13,15 @@
 // Make up for header deficiencies.
 
 #ifndef RAMFS_MAGIC
-#define RAMFS_MAGIC		0x858458f6
+#define RAMFS_MAGIC ((unsigned)0x858458f6)
 #endif
 
 #ifndef TMPFS_MAGIC
-#define TMPFS_MAGIC		0x01021994
+#define TMPFS_MAGIC ((unsigned)0x01021994)
 #endif
 
 #ifndef MS_MOVE
-#define MS_MOVE			8192
+#define MS_MOVE     8192
 #endif
 
 static dev_t rootdev;
@@ -91,10 +91,10 @@ int switch_root_main(int argc ATTRIBUTE_UNUSED, char **argv)
 	// we mean it.  (I could make this a CONFIG option, but I would get email
 	// from all the people who WILL eat their filesystems.)
 
-	if (lstat("/init", &st1) || !S_ISREG(st1.st_mode) || statfs("/", &stfs) ||
-		(stfs.f_type != RAMFS_MAGIC && stfs.f_type != TMPFS_MAGIC) ||
-		getpid() != 1)
-	{
+	if (lstat("/init", &st1) || !S_ISREG(st1.st_mode) || statfs("/", &stfs)
+	 || (((unsigned)stfs.f_type != RAMFS_MAGIC) && ((unsigned)stfs.f_type != TMPFS_MAGIC))
+	 || (getpid() != 1)
+	) {
 		bb_error_msg_and_die("not rootfs");
 	}
 
diff --git a/util-linux/volume_id/util.c b/util-linux/volume_id/util.c
index ce7de23..240b3c1 100644
--- a/util-linux/volume_id/util.c
+++ b/util-linux/volume_id/util.c
@@ -212,7 +212,7 @@ void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len)
 			}
 			dbg("got 0x%zx (%zi) bytes", buf_len, buf_len);
 			id->sbbuf_len = buf_len;
-			if (buf_len < off + len) {
+			if ((uint64_t)buf_len < off + len) {
 				dbg("requested 0x%zx bytes, got only 0x%zx bytes", len, buf_len);
 				return NULL;
 			}
@@ -243,7 +243,7 @@ void *volume_id_get_buffer(struct volume_id *id, uint64_t off, size_t len)
 		dbg("got 0x%zx (%zi) bytes", buf_len, buf_len);
 		id->seekbuf_off = off;
 		id->seekbuf_len = buf_len;
-		if (buf_len < len) {
+		if ((size_t)buf_len < len) {
 			dbg("requested 0x%zx bytes, got only 0x%zx bytes", len, buf_len);
 			return NULL;
 		}
diff --git a/util-linux/volume_id/volume_id.c b/util-linux/volume_id/volume_id.c
index de9aae2..aec96a2 100644
--- a/util-linux/volume_id/volume_id.c
+++ b/util-linux/volume_id/volume_id.c
@@ -152,7 +152,7 @@ static const probe_fptr fs2[] = {
 
 int volume_id_probe_all(struct volume_id *id, uint64_t off, uint64_t size)
 {
-	int i;
+	size_t i;
 
 	if (id == NULL)
 		return -EINVAL;