e2fsprogs: code shrink

   text    data     bss     dec     hex filename
 776594     974    9420  786988   c022c busybox_old
 776494     974    9420  786888   c01c8 busybox_unstripped

e2fsprogs/chattr.c

@@ -37,27 +37,9 @@ struct globals {
 
 static unsigned long get_flag(char c)
 {
-	/* Two separate vectors take less space than vector of structs */
-	static const char flags_letter[] ALIGN1 = "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];
+	const char *fp = strchr(e2attr_flags_sname_chattr, c);
+	if (fp)
+		return e2attr_flags_value_chattr[fp - e2attr_flags_sname_chattr];
 	bb_show_usage();
 }
 

e2fsprogs/e2fs_lib.c

@@ -141,59 +141,87 @@ int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_f
 
 
 /* Print file attributes on an ext2 file system */
-struct flags_name {
-	unsigned long	flag;
-	char		short_name;
-	const char	*long_name;
+const uint32_t e2attr_flags_value[] = {
+#ifdef ENABLE_COMPRESSION
+	EXT2_COMPRBLK_FL,
+	EXT2_DIRTY_FL,
+	EXT2_NOCOMPR_FL,
+	EXT2_ECOMPR_FL,
+#endif
+	EXT2_INDEX_FL,
+	EXT2_SECRM_FL,
+	EXT2_UNRM_FL,
+	EXT2_SYNC_FL,
+	EXT2_DIRSYNC_FL,
+	EXT2_IMMUTABLE_FL,
+	EXT2_APPEND_FL,
+	EXT2_NODUMP_FL,
+	EXT2_NOATIME_FL,
+	EXT2_COMPR_FL,
+	EXT3_JOURNAL_DATA_FL,
+	EXT2_NOTAIL_FL,
+	EXT2_TOPDIR_FL
 };
 
-/* TODO: apart from I and (disabled) COMPRESSION flags, this
- * is a duplicate of a table from chattr. Merge? */
-static const struct flags_name flags_array[] = {
-	{ EXT2_SECRM_FL, 's', "Secure_Deletion" },
-	{ EXT2_UNRM_FL, 'u' , "Undelete" },
-	{ EXT2_SYNC_FL, 'S', "Synchronous_Updates" },
-	{ EXT2_DIRSYNC_FL, 'D', "Synchronous_Directory_Updates" },
-	{ EXT2_IMMUTABLE_FL, 'i', "Immutable" },
-	{ EXT2_APPEND_FL, 'a', "Append_Only" },
-	{ EXT2_NODUMP_FL, 'd', "No_Dump" },
-	{ EXT2_NOATIME_FL, 'A', "No_Atime" },
-	{ EXT2_COMPR_FL, 'c', "Compression_Requested" },
+const char e2attr_flags_sname[] =
 #ifdef ENABLE_COMPRESSION
-	{ EXT2_COMPRBLK_FL, 'B', "Compressed_File" },
-	{ EXT2_DIRTY_FL, 'Z', "Compressed_Dirty_File" },
-	{ EXT2_NOCOMPR_FL, 'X', "Compression_Raw_Access" },
-	{ EXT2_ECOMPR_FL, 'E', "Compression_Error" },
+	"BZXE"
 #endif
-	{ EXT3_JOURNAL_DATA_FL, 'j', "Journaled_Data" },
-	{ EXT2_INDEX_FL, 'I', "Indexed_directory" },
-	{ EXT2_NOTAIL_FL, 't', "No_Tailmerging" },
-	{ EXT2_TOPDIR_FL, 'T', "Top_of_Directory_Hierarchies" },
-	{ 0, '\0', NULL }
-};
+	"I"
+	"suSDiadAcjtT";
+
+static const char e2attr_flags_lname[] =
+#ifdef ENABLE_COMPRESSION
+	"Compressed_File" "\0"
+	"Compressed_Dirty_File" "\0"
+	"Compression_Raw_Access" "\0"
+	"Compression_Error" "\0"
+#endif
+	"Indexed_directory" "\0"
+	"Secure_Deletion" "\0"
+	"Undelete" "\0"
+	"Synchronous_Updates" "\0"
+	"Synchronous_Directory_Updates" "\0"
+	"Immutable" "\0"
+	"Append_Only" "\0"
+	"No_Dump" "\0"
+	"No_Atime" "\0"
+	"Compression_Requested" "\0"
+	"Journaled_Data" "\0"
+	"No_Tailmerging" "\0"
+	"Top_of_Directory_Hierarchies" "\0"
+	/* Another trailing NUL is added by compiler */;
 
 void print_flags(FILE *f, unsigned long flags, unsigned options)
 {
-	const struct flags_name *fp;
+	const uint32_t *fv;
+	const char *fn;
 
+	fv = e2attr_flags_value;
 	if (options & PFOPT_LONG) {
 		int first = 1;
-		for (fp = flags_array; fp->short_name; fp++) {
-			if (flags & fp->flag) {
+		fn = e2attr_flags_lname;
+		do {
+			if (flags & *fv) {
 				if (!first)
 					fputs(", ", f);
-				fputs(fp->long_name, f);
+				fputs(fn, f);
 				first = 0;
 			}
-		}
+			fv++;
+			fn += strlen(fn) + 1;
+		} while (*fn);
 		if (first)
 			fputs("---", f);
 	} else {
-		for (fp = flags_array; fp->short_name; fp++) {
+		fn = e2attr_flags_sname;
+		do  {
 			char c = '-';
-			if (flags & fp->flag)
-				c = fp->short_name;
+			if (flags & *fv)
+				c = *fn;
 			fputc(c, f);
-		}
+			fv++;
+			fn++;
+		} while (*fn);
 	}
 }

e2fsprogs/e2fs_lib.h

@@ -28,3 +28,16 @@ int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_f
 #define PFOPT_LONG  1
 /* Print file attributes on an ext2 file system */
 void print_flags(FILE *f, unsigned long flags, unsigned options);
+
+extern const uint32_t e2attr_flags_value[];
+extern const char e2attr_flags_sname[];
+
+/* If you plan to ENABLE_COMPRESSION, see e2fs_lib.c and chattr.c - */
+/* make sure that chattr doesn't accept bad options! */
+#ifdef ENABLE_COMPRESSION
+#define e2attr_flags_value_chattr (&e2attr_flags_value[5])
+#define e2attr_flags_sname_chattr (&e2attr_flags_sname[5])
+#else
+#define e2attr_flags_value_chattr (&e2attr_flags_value[1])
+#define e2attr_flags_sname_chattr (&e2attr_flags_sname[1])
+#endif

e2fsprogs/lsattr.c

@@ -104,8 +104,7 @@ int lsattr_main(int argc, char **argv)
 	if (!*argv)
 		lsattr_args(".");
 	else {
-		while (*argv)
-			lsattr_args(*argv++);
+		do lsattr_args(*argv++); while (*argv);
 	}
 
 	return EXIT_SUCCESS;