*: remove a few more cases of argc usage. -89 bytes.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

10 files changed, 43 insertions, 54 deletions

diff --git a/coreutils/chroot.c b/coreutils/chroot.c
index 9b3d700..f7228a6 100644
--- a/coreutils/chroot.c
+++ b/coreutils/chroot.c
@@ -12,18 +12,16 @@
 #include "libbb.h"
 
 int chroot_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int chroot_main(int argc, char **argv)
+int chroot_main(int argc UNUSED_PARAM, char **argv)
 {
-	if (argc < 2) {
-		bb_show_usage();
-	}
-
 	++argv;
+	if (!*argv)
+		bb_show_usage();
 	xchroot(*argv);
 	xchdir("/");
 
 	++argv;
-	if (argc == 2) {
+	if (!*argv) { /* no 2nd param (PROG), use shell */
 		argv -= 2;
 		argv[0] = getenv("SHELL");
 		if (!argv[0]) {
diff --git a/coreutils/df.c b/coreutils/df.c
index a0e6fe0..11a7398 100644
--- a/coreutils/df.c
+++ b/coreutils/df.c
@@ -35,7 +35,7 @@ static unsigned long kscale(unsigned long b, unsigned long bs)
 #endif
 
 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int df_main(int argc, char **argv)
+int df_main(int argc UNUSED_PARAM, char **argv)
 {
 	unsigned long blocks_used;
 	unsigned blocks_percent_used;
@@ -105,7 +105,7 @@ int df_main(int argc, char **argv)
 
 	mount_table = NULL;
 	argv += optind;
-	if (optind >= argc) {
+	if (!argv[0]) {
 		mount_table = setmntent(bb_path_mtab_file, "r");
 		if (!mount_table)
 			bb_perror_msg_and_die(bb_path_mtab_file);
diff --git a/coreutils/dirname.c b/coreutils/dirname.c
index 1f5f70d..94c22a7 100644
--- a/coreutils/dirname.c
+++ b/coreutils/dirname.c
@@ -15,13 +15,8 @@
 /* This is a NOFORK applet. Be very careful! */
 
 int dirname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int dirname_main(int argc, char **argv)
+int dirname_main(int argc UNUSED_PARAM, char **argv)
 {
-	if (argc != 2) {
-		bb_show_usage();
-	}
-
-	puts(dirname(argv[1]));
-
+	puts(dirname(single_argv(argv)));
 	return fflush_all();
 }
diff --git a/coreutils/dos2unix.c b/coreutils/dos2unix.c
index baf879e..1911f53 100644
--- a/coreutils/dos2unix.c
+++ b/coreutils/dos2unix.c
@@ -69,7 +69,7 @@ static void convert(char *fn, int conv_type)
 }
 
 int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int dos2unix_main(int argc, char **argv)
+int dos2unix_main(int argc UNUSED_PARAM, char **argv)
 {
 	int o, conv_type;
 
@@ -88,11 +88,11 @@ int dos2unix_main(int argc, char **argv)
 	if (o)
 		conv_type = o;
 
+	argv += optind;
 	do {
 		/* might be convert(NULL) if there is no filename given */
-		convert(argv[optind], conv_type);
-		optind++;
-	} while (optind < argc);
+		convert(*argv, conv_type);
+	} while (*++argv);
 
 	return 0;
 }
diff --git a/coreutils/ln.c b/coreutils/ln.c
index eb71719..f977aa1 100644
--- a/coreutils/ln.c
+++ b/coreutils/ln.c
@@ -26,7 +26,7 @@ int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int ln_main(int argc, char **argv)
 {
 	int status = EXIT_SUCCESS;
-	int flag;
+	int opts;
 	char *last;
 	char *src_name;
 	char *src;
@@ -34,11 +34,8 @@ int ln_main(int argc, char **argv)
 	struct stat statbuf;
 	int (*link_func)(const char *, const char *);
 
-	flag = getopt32(argv, "sfnbS:", &suffix);
-
-	if (argc == optind) {
-		bb_show_usage();
-	}
+	opt_complementary = "-1"; /* min one arg */
+	opts = getopt32(argv, "sfnbS:", &suffix);
 
 	last = argv[argc - 1];
 	argv += optind;
@@ -53,7 +50,7 @@ int ln_main(int argc, char **argv)
 		src = last;
 
 		if (is_directory(src,
-		                (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
+		                (opts & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
 		                NULL)
 		) {
 			src_name = xstrdup(*argv);
@@ -61,7 +58,7 @@ int ln_main(int argc, char **argv)
 			free(src_name);
 			src_name = src;
 		}
-		if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
+		if (!(opts & LN_SYMLINK) && stat(*argv, &statbuf)) {
 			// coreutils: "ln dangling_symlink new_hardlink" works
 			if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) {
 				bb_simple_perror_msg(*argv);
@@ -71,7 +68,7 @@ int ln_main(int argc, char **argv)
 			}
 		}
 
-		if (flag & LN_BACKUP) {
+		if (opts & LN_BACKUP) {
 			char *backup;
 			backup = xasprintf("%s%s", src, suffix);
 			if (rename(src, backup) < 0 && errno != ENOENT) {
@@ -87,12 +84,12 @@ int ln_main(int argc, char **argv)
 			 * Therefore, always unlink().
 			 */
 			unlink(src);
-		} else if (flag & LN_FORCE) {
+		} else if (opts & LN_FORCE) {
 			unlink(src);
 		}
 
 		link_func = link;
-		if (flag & LN_SYMLINK) {
+		if (opts & LN_SYMLINK) {
 			link_func = symlink;
 		}
 
diff --git a/coreutils/mkdir.c b/coreutils/mkdir.c
index a110165..c837e97 100644
--- a/coreutils/mkdir.c
+++ b/coreutils/mkdir.c
@@ -34,7 +34,7 @@ static const char mkdir_longopts[] ALIGN1 =
 #endif
 
 int mkdir_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int mkdir_main(int argc, char **argv)
+int mkdir_main(int argc UNUSED_PARAM, char **argv)
 {
 	mode_t mode = (mode_t)(-1);
 	int status = EXIT_SUCCESS;
@@ -64,11 +64,9 @@ int mkdir_main(int argc, char **argv)
 	}
 #endif
 
-	if (optind == argc) {
-		bb_show_usage();
-	}
-
 	argv += optind;
+	if (!argv[0])
+		bb_show_usage();
 
 	do {
 		if (bb_make_directory(*argv, mode, flags)) {
diff --git a/coreutils/nohup.c b/coreutils/nohup.c
index f44e2af..c9e65d2 100644
--- a/coreutils/nohup.c
+++ b/coreutils/nohup.c
@@ -32,14 +32,14 @@ nohup: redirecting stderr to stdout
 */
 
 int nohup_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int nohup_main(int argc, char **argv)
+int nohup_main(int argc UNUSED_PARAM, char **argv)
 {
 	const char *nohupout;
 	char *home;
 
 	xfunc_error_retval = 127;
 
-	if (argc < 2) bb_show_usage();
+	if (!argv[1]) bb_show_usage();
 
 	/* If stdin is a tty, detach from it. */
 	if (isatty(STDIN_FILENO)) {
diff --git a/coreutils/stat.c b/coreutils/stat.c
index 2bc9a08..bbd2e6a 100644
--- a/coreutils/stat.c
+++ b/coreutils/stat.c
@@ -640,29 +640,29 @@ static bool do_stat(const char *filename, const char *format)
 }
 
 int stat_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int stat_main(int argc, char **argv)
+int stat_main(int argc UNUSED_PARAM, char **argv)
 {
 	IF_FEATURE_STAT_FORMAT(char *format = NULL;)
 	int i;
-	int ok = 1;
+	int ok;
+	unsigned opts;
 	statfunc_ptr statfunc = do_stat;
 
-	getopt32(argv, "ftL"
+	opt_complementary = "-1"; /* min one arg */
+	opts = getopt32(argv, "ftL"
 		IF_SELINUX("Z")
 		IF_FEATURE_STAT_FORMAT("c:", &format)
 	);
-
-	if (option_mask32 & OPT_FILESYS) /* -f */
+	if (opts & OPT_FILESYS) /* -f */
 		statfunc = do_statfs;
-	if (argc == optind)           /* files */
-		bb_show_usage();
-
 #if ENABLE_SELINUX
-	if (option_mask32 & OPT_SELINUX) {
+	if (opts & OPT_SELINUX) {
 		selinux_or_die();
 	}
-#endif	/* ENABLE_SELINUX */
-	for (i = optind; i < argc; ++i)
+#endif
+	ok = 1;
+	argv += optind;
+	for (i = 0; argv[i]; ++i)
 		ok &= statfunc(argv[i] IF_FEATURE_STAT_FORMAT(, format));
 
 	return (ok ? EXIT_SUCCESS : EXIT_FAILURE);
diff --git a/coreutils/stty.c b/coreutils/stty.c
index f29fa64..0485b80 100644
--- a/coreutils/stty.c
+++ b/coreutils/stty.c
@@ -1156,7 +1156,7 @@ static void set_control_char_or_die(const struct control_info *info,
 #define STTY_noargs             (1 << 4)
 
 int stty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int stty_main(int argc, char **argv)
+int stty_main(int argc UNUSED_PARAM, char **argv)
 {
 	struct termios mode;
 	void (*output_func)(const struct termios *, const int);
@@ -1211,8 +1211,10 @@ int stty_main(int argc, char **argv)
 						if (!file_name)
 							bb_error_msg_and_die(bb_msg_requires_arg, "-F");
 						/* remove -F param from arg[vc] */
-						--argc;
-						while (argv[p]) { argv[p] = argv[p+1]; ++p; }
+						while (argv[p]) {
+							argv[p] = argv[p+1];
+							++p;
+						}
 					}
 					goto end_option;
 				default:
diff --git a/coreutils/yes.c b/coreutils/yes.c
index 9d3f675..d757a45 100644
--- a/coreutils/yes.c
+++ b/coreutils/yes.c
@@ -19,14 +19,13 @@
 /* This is a NOFORK applet. Be very careful! */
 
 int yes_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int yes_main(int argc, char **argv)
+int yes_main(int argc UNUSED_PARAM, char **argv)
 {
 	char **pp;
 
 	argv[0] = (char*)"y";
-	if (argc != 1) {
+	if (argv[1])
 		++argv;
-	}
 
 	do {
 		pp = argv;