du: remove statics (by Bernhard Fischer <rep.dot.nop@gmail.com>)

$ ./.cmk bloatcheck
function                                             old     new   delta
du_main                                              340     348      +8
print                                                 39      40      +1
status                                               129     125      -4
slink_depth                                            4       -      -4
print_files                                            4       -      -4
one_file_system                                        4       -      -4
max_print_depth                                        4       -      -4
du_depth                                               4       -      -4
disp_hr                                                4       -      -4
count_hardlinks                                        4       -      -4
du                                                   407     401      -6
dir_dev                                                8       -      -8
------------------------------------------------------------------------------
(add/remove: 0/8 grow/shrink: 2/2 up/down: 9/-46)             Total: -37 bytes
   text    data     bss     dec     hex filename
    864      12      28     904     388 busybox.t3/coreutils/du.o
    867       0       0     867     363 busybox.t4/coreutils/du.o
 770647    1063   10788  782498   bf0a2 busybox.t3/busybox_unstripped
 770651    1051   10764  782466   bf082 busybox.t4/busybox_unstripped

1 files changed, 64 insertions, 64 deletions

diff --git a/coreutils/du.c b/coreutils/du.c
index 757fa14cc..b5e68d8f8 100644
--- a/coreutils/du.c
+++ b/coreutils/du.c
@@ -25,37 +25,34 @@
 
 #include "libbb.h"
 
+struct globals {
 #if ENABLE_FEATURE_HUMAN_READABLE
-# if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
-static unsigned long disp_hr = 1024;
-# else
-static unsigned long disp_hr = 512;
-# endif
-#elif ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
-static unsigned disp_k = 1;
+	unsigned long disp_hr;
 #else
-static unsigned disp_k;	/* bss inits to 0 */
+	unsigned disp_k;
 #endif
 
-static int max_print_depth = INT_MAX;
-static nlink_t count_hardlinks = 1;
+	int max_print_depth;
+	nlink_t count_hardlinks;
 
-static int status;
-static int print_files;
-static int slink_depth;
-static int du_depth;
-static int one_file_system;
-static dev_t dir_dev;
+	bool status;
+	bool one_file_system;
+	int print_files;
+	int slink_depth;
+	int du_depth;
+	dev_t dir_dev;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
 
 
-static void print(long size, const char *const filename)
+static void print(unsigned long size, const char *filename)
 {
 	/* TODO - May not want to defer error checking here. */
 #if ENABLE_FEATURE_HUMAN_READABLE
-	printf("%s\t%s\n", make_human_readable_str(size, 512, disp_hr),
+	printf("%s\t%s\n", make_human_readable_str(size, 512, G.disp_hr),
 			filename);
 #else
-	if (disp_k) {
+	if (G.disp_k) {
 		size++;
 		size >>= 1;
 	}
@@ -64,21 +61,21 @@ static void print(long size, const char *const filename)
 }
 
 /* tiny recursive du */
-static long du(const char *const filename)
+static unsigned long du(const char *filename)
 {
 	struct stat statbuf;
-	long sum;
+	unsigned long sum;
 
 	if (lstat(filename, &statbuf) != 0) {
 		bb_perror_msg("%s", filename);
-		status = EXIT_FAILURE;
+		G.status = EXIT_FAILURE;
 		return 0;
 	}
 
-	if (one_file_system) {
-		if (du_depth == 0) {
-			dir_dev = statbuf.st_dev;
-		} else if (dir_dev != statbuf.st_dev) {
+	if (G.one_file_system) {
+		if (G.du_depth == 0) {
+			G.dir_dev = statbuf.st_dev;
+		} else if (G.dir_dev != statbuf.st_dev) {
 			return 0;
 		}
 	}
@@ -86,20 +83,20 @@ static long du(const char *const filename)
 	sum = statbuf.st_blocks;
 
 	if (S_ISLNK(statbuf.st_mode)) {
-		if (slink_depth > du_depth) {	/* -H or -L */
+		if (G.slink_depth > G.du_depth) {	/* -H or -L */
 			if (stat(filename, &statbuf) != 0) {
 				bb_perror_msg("%s", filename);
-				status = EXIT_FAILURE;
+				G.status = EXIT_FAILURE;
 				return 0;
 			}
 			sum = statbuf.st_blocks;
-			if (slink_depth == 1) {
-				slink_depth = INT_MAX;	/* Convert -H to -L. */
+			if (G.slink_depth == 1) {
+				G.slink_depth = INT_MAX;	/* Convert -H to -L. */
 			}
 		}
 	}
 
-	if (statbuf.st_nlink > count_hardlinks) {
+	if (statbuf.st_nlink > G.count_hardlinks) {
 		/* Add files/directories with links only once */
 		if (is_in_ino_dev_hashtable(&statbuf)) {
 			return 0;
@@ -114,7 +111,7 @@ static long du(const char *const filename)
 
 		dir = warn_opendir(filename);
 		if (!dir) {
-			status = EXIT_FAILURE;
+			G.status = EXIT_FAILURE;
 			return sum;
 		}
 
@@ -128,16 +125,16 @@ static long du(const char *const filename)
 			newfile = concat_subpath_file(filename, name);
 			if (newfile == NULL)
 				continue;
-			++du_depth;
+			++G.du_depth;
 			sum += du(newfile);
-			--du_depth;
+			--G.du_depth;
 			free(newfile);
 		}
 		closedir(dir);
-	} else if (du_depth > print_files) {
+	} else if (G.du_depth > G.print_files) {
 		return sum;
 	}
-	if (du_depth <= max_print_depth) {
+	if (G.du_depth <= G.max_print_depth) {
 		print(sum, filename);
 	}
 	return sum;
@@ -146,21 +143,23 @@ static long du(const char *const filename)
 int du_main(int argc, char **argv);
 int du_main(int argc, char **argv)
 {
-	long total;
+	unsigned long total;
 	int slink_depth_save;
-	int print_final_total;
+	bool print_final_total;
 	char *smax_print_depth;
 	unsigned opt;
 
-#if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
-	if (getenv("POSIXLY_CORRECT")) {	/* TODO - a new libbb function? */
 #if ENABLE_FEATURE_HUMAN_READABLE
-		disp_hr = 512;
+	USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
+	SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
+	if (getenv("POSIXLY_CORRECT"))  /* TODO - a new libbb function? */
+		G.disp_hr = 512;
 #else
-		disp_k = 0;
-#endif
-	}
+	USE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
+	/* SKIP_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
 #endif
+	G.max_print_depth = INT_MAX;
+	G.count_hardlinks = 1;
 
 	/* Note: SUSv3 specifies that -a and -s options cannot be used together
 	 * in strictly conforming applications.  However, it also says that some
@@ -171,75 +170,76 @@ int du_main(int argc, char **argv)
 #if ENABLE_FEATURE_HUMAN_READABLE
 	opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
 	opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
+	argv += optind;
 	if (opt & (1 << 9)) {
 		/* -h opt */
-		disp_hr = 0;
+		G.disp_hr = 0;
 	}
 	if (opt & (1 << 10)) {
 		/* -m opt */
-		disp_hr = 1024*1024;
+		G.disp_hr = 1024*1024;
 	}
 	if (opt & (1 << 2)) {
 		/* -k opt */
-		disp_hr = 1024;
+		G.disp_hr = 1024;
 	}
 #else
 	opt_complementary = "H-L:L-H:s-d:d-s";
 	opt = getopt32(argv, "aHkLsx" "d:" "lc", &smax_print_depth);
+	argv += optind;
 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 	if (opt & (1 << 2)) {
 		/* -k opt */
-		disp_k = 1;
+		G.disp_k = 1;
 	}
 #endif
 #endif
 	if (opt & (1 << 0)) {
 		/* -a opt */
-		print_files = INT_MAX;
+		G.print_files = INT_MAX;
 	}
 	if (opt & (1 << 1)) {
 		/* -H opt */
-		slink_depth = 1;
+		G.slink_depth = 1;
 	}
 	if (opt & (1 << 3)) {
 		/* -L opt */
-		slink_depth = INT_MAX;
+		G.slink_depth = INT_MAX;
 	}
 	if (opt & (1 << 4)) {
 		/* -s opt */
-		max_print_depth = 0;
+		G.max_print_depth = 0;
 	}
-	one_file_system = opt & (1 << 5); /* -x opt */
+	G.one_file_system = opt & (1 << 5); /* -x opt */
 	if (opt & (1 << 6)) {
 		/* -d opt */
-		max_print_depth = xatoi_u(smax_print_depth);
+		G.max_print_depth = xatoi_u(smax_print_depth);
 	}
 	if (opt & (1 << 7)) {
 		/* -l opt */
-		count_hardlinks = MAXINT(nlink_t);
+		G.count_hardlinks = MAXINT(nlink_t);
 	}
 	print_final_total = opt & (1 << 8); /* -c opt */
 
 	/* go through remaining args (if any) */
-	argv += optind;
-	if (optind >= argc) {
+	if (!*argv) {
 		*--argv = (char*)".";
-		if (slink_depth == 1) {
-			slink_depth = 0;
+		if (G.slink_depth == 1) {
+			G.slink_depth = 0;
 		}
 	}
 
-	slink_depth_save = slink_depth;
+	slink_depth_save = G.slink_depth;
 	total = 0;
 	do {
 		total += du(*argv);
-		slink_depth = slink_depth_save;
+		G.slink_depth = slink_depth_save;
 	} while (*++argv);
+
 	if (ENABLE_FEATURE_CLEAN_UP)
 		reset_ino_dev_hashtable();
-	if (print_final_total) {
+	if (print_final_total)
 		print(total, "total");
-	}
 
-	fflush_stdout_and_exit(status);
+	fflush_stdout_and_exit(G.status);
 }