e2fsprogs: stop using statics in chattr. Minor code shrinkage (-130 bytes)

1 files changed, 72 insertions, 72 deletions

diff --git a/e2fsprogs/chattr.c b/e2fsprogs/chattr.c
index 1b7942e..82dba4a 100644
--- a/e2fsprogs/chattr.c
+++ b/e2fsprogs/chattr.c
@@ -26,59 +26,54 @@
 #define OPT_REM 2
 #define OPT_SET 4
 #define OPT_SET_VER 8
-static int flags;
-static int recursive;
 
-static unsigned long version;
-
-static unsigned long af;
-static unsigned long rf;
-static unsigned long sf;
-
-struct flags_char {
-	unsigned long flag;
-	char optchar;
-};
-
-static const struct flags_char flags_array[] = {
-	{ EXT2_NOATIME_FL,      'A' },
-	{ EXT2_SYNC_FL,         'S' },
-	{ EXT2_DIRSYNC_FL,      'D' },
-	{ EXT2_APPEND_FL,       'a' },
-	{ EXT2_COMPR_FL,        'c' },
-	{ EXT2_NODUMP_FL,       'd' },
-	{ EXT2_IMMUTABLE_FL,    'i' },
-	{ EXT3_JOURNAL_DATA_FL, 'j' },
-	{ EXT2_SECRM_FL,        's' },
-	{ EXT2_UNRM_FL,         'u' },
-	{ EXT2_NOTAIL_FL,       't' },
-	{ EXT2_TOPDIR_FL,       'T' },
-	{ 0, 0 }
+struct globals {
+	unsigned long version;
+	unsigned long af;
+	unsigned long rf;
+	smallint flags;
+	smallint recursive;
 };
 
 static unsigned long get_flag(char c)
 {
-	const struct flags_char *fp;
-	for (fp = flags_array; fp->optchar; fp++)
-		if (fp->optchar == c)
-			return fp->flag;
+	/* Two separate vectors take less space than vector of structs */
+	static const char flags_letter[] = "ASDacdijsutT";
+	static const unsigned long flags_val[] = {
+		/* A */ EXT2_NOATIME_FL,
+		/* S */ EXT2_SYNC_FL,
+		/* D */ EXT2_DIRSYNC_FL,
+		/* a */ EXT2_APPEND_FL,
+		/* c */ EXT2_COMPR_FL,
+		/* d */ EXT2_NODUMP_FL,
+		/* i */ EXT2_IMMUTABLE_FL,
+		/* j */ EXT3_JOURNAL_DATA_FL,
+		/* s */ EXT2_SECRM_FL,
+		/* u */ EXT2_UNRM_FL,
+		/* t */ EXT2_NOTAIL_FL,
+		/* T */ EXT2_TOPDIR_FL,
+	};
+	const char *fp;
+
+	for (fp = flags_letter; *fp; fp++)
+		if (*fp == c)
+			return flags_val[fp - flags_letter];
 	bb_show_usage();
 }
 
-static int decode_arg(const char *arg)
+static int decode_arg(const char *arg, struct globals *gp)
 {
 	unsigned long *fl;
 	char opt = *arg++;
 
+	fl = &gp->af;
 	if (opt == '-') {
-		flags |= OPT_REM;
-		fl = &rf;
+		gp->flags |= OPT_REM;
+		fl = &gp->rf;
 	} else if (opt == '+') {
-		flags |= OPT_ADD;
-		fl = ⁡
+		gp->flags |= OPT_ADD;
 	} else if (opt == '=') {
-		flags |= OPT_SET;
-		fl = &sf;
+		gp->flags |= OPT_SET;
 	} else
 		return 0;
 
@@ -88,30 +83,29 @@ static int decode_arg(const char *arg)
 	return 1;
 }
 
-static void change_attributes(const char *name);
+static void change_attributes(const char *name, struct globals *gp);
 
-static int chattr_dir_proc(const char *dir_name, struct dirent *de,
-			void *private ATTRIBUTE_UNUSED)
+static int chattr_dir_proc(const char *dir_name, struct dirent *de, void *gp)
 {
 	char *path = concat_subpath_file(dir_name, de->d_name);
 	/* path is NULL if de->d_name is "." or "..", else... */
 	if (path) {
-		change_attributes(path);
+		change_attributes(path, gp);
 		free(path);
 	}
 	return 0;
 }
 
-static void change_attributes(const char *name)
+static void change_attributes(const char *name, struct globals *gp)
 {
 	unsigned long fsflags;
 	struct stat st;
 
-	if (lstat(name, &st) == -1) {
+	if (lstat(name, &st) != 0) {
 		bb_perror_msg("stat %s", name);
 		return;
 	}
-	if (S_ISLNK(st.st_mode) && recursive)
+	if (S_ISLNK(st.st_mode) && gp->recursive)
 		return;
 
 	/* Don't try to open device files, fifos etc.  We probably
@@ -121,70 +115,76 @@ static void change_attributes(const char *name)
 	if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode) && !S_ISDIR(st.st_mode))
 		return;
 
-	if (flags & OPT_SET_VER)
-		if (fsetversion(name, version) == -1)
+	if (gp->flags & OPT_SET_VER)
+		if (fsetversion(name, gp->version) != 0)
 			bb_perror_msg("setting version on %s", name);
 
-	if (flags & OPT_SET) {
-		fsflags = sf;
+	if (gp->flags & OPT_SET) {
+		fsflags = gp->af;
 	} else {
-		if (fgetflags(name, &fsflags) == -1) {
+		if (fgetflags(name, &fsflags) != 0) {
 			bb_perror_msg("reading flags on %s", name);
 			goto skip_setflags;
 		}
-		if (flags & OPT_REM)
-			fsflags &= ~rf;
-		if (flags & OPT_ADD)
-			fsflags |= af;
+		/*if (gp->flags & OPT_REM) - not needed, rf is zero otherwise */
+			fsflags &= ~gp->rf;
+		/*if (gp->flags & OPT_ADD) - not needed, af is zero otherwise */
+			fsflags |= gp->af;
+		/* What is this? And why it's not done for SET case? */
 		if (!S_ISDIR(st.st_mode))
 			fsflags &= ~EXT2_DIRSYNC_FL;
 	}
-	if (fsetflags(name, fsflags) == -1)
+	if (fsetflags(name, fsflags) != 0)
 		bb_perror_msg("setting flags on %s", name);
 
  skip_setflags:
-	if (recursive && S_ISDIR(st.st_mode))
-		iterate_on_dir(name, chattr_dir_proc, NULL);
+	if (gp->recursive && S_ISDIR(st.st_mode))
+		iterate_on_dir(name, chattr_dir_proc, gp);
 }
 
 int chattr_main(int argc, char **argv);
 int chattr_main(int argc, char **argv)
 {
+	struct globals g;
 	char *arg;
 
+	memset(&g, 0, sizeof(g));
+
 	/* parse the args */
 	while ((arg = *++argv)) {
 		/* take care of -R and -v <version> */
-		if (arg[0] == '-') {
-			if (arg[1] == 'R' && arg[2] == '\0') {
-				recursive = 1;
-				continue;
-			}
-			if (arg[1] == 'v' && arg[2] == '\0') {
-				if (!*++argv)
-					bb_show_usage();
-				version = xatoul(*argv);
-				flags |= OPT_SET_VER;
+		if (arg[0] == '-'
+		 && (arg[1] == 'R' || arg[1] == 'v')
+		 && !arg[2]
+		) {
+			if (arg[1] == 'R') {
+				g.recursive = 1;
 				continue;
 			}
+			/* arg[1] == 'v' */
+			if (!*++argv)
+				bb_show_usage();
+			g.version = xatoul(*argv);
+			g.flags |= OPT_SET_VER;
+			continue;
 		}
 
-		if (!decode_arg(arg))
+		if (!decode_arg(arg, &g))
 			break;
 	}
 
 	/* run sanity checks on all the arguments given us */
 	if (!*argv)
 		bb_show_usage();
-	if ((flags & OPT_SET) && (flags & (OPT_ADD|OPT_REM)))
+	if ((g.flags & OPT_SET) && (g.flags & (OPT_ADD|OPT_REM)))
 		bb_error_msg_and_die("= is incompatible with - and +");
-	if (rf & af)
+	if (g.rf & g.af)
 		bb_error_msg_and_die("can't set and unset a flag");
-	if (!flags)
+	if (!g.flags)
 		bb_error_msg_and_die("must use '-v', =, - or +");
 
 	/* now run chattr on all the files passed to us */
-	do change_attributes(*argv); while (*++argv);
+	do change_attributes(*argv, &g); while (*++argv);
 
 	return EXIT_SUCCESS;
 }