libbb: introduce and use print_flags().

Mostly by Natanael Copa <natanael.copa AT gmail.com>

function                                             old     new   delta
print_e2flags                                          -     189    +189
print_flags_separated                                  -      86     +86
static.flag_labels                                     -      60     +60
static.dma_wmode_masks                                 -      32     +32
static.flag_masks                                      -      28     +28
static.arp_labels                                      -      16     +16
static.arp_masks                                       -      12     +12
ls_main                                              836     843      +7
...
popstring                                            140     134      -6
arp_show                                             740     708     -32
print_flags                                          189      25    -164
ipaddr_list_or_flush                                2396    2170    -226
process_dev                                         5306    4706    -600
------------------------------------------------------------------------------
(add/remove: 10/0 grow/shrink: 5/10 up/down: 458/-1043)      Total: -585 bytes
   text    data     bss     dec     hex filename
 810564     624    7060  818248   c7c48 busybox_old
 810002     624    7060  817686   c7a16 busybox_unstripped

11 files changed, 77 insertions, 76 deletions

diff --git a/e2fsprogs/e2fs_lib.c b/e2fsprogs/e2fs_lib.c
index 89e050051..839109e3f 100644
--- a/e2fsprogs/e2fs_lib.c
+++ b/e2fsprogs/e2fs_lib.c
@@ -192,7 +192,7 @@ static const char e2attr_flags_lname[] =
 	"Top_of_Directory_Hierarchies" "\0"
 	/* Another trailing NUL is added by compiler */;
 
-void print_flags(FILE *f, unsigned long flags, unsigned options)
+void print_e2flags(FILE *f, unsigned long flags, unsigned options)
 {
 	const uint32_t *fv;
 	const char *fn;
diff --git a/e2fsprogs/e2fs_lib.h b/e2fsprogs/e2fs_lib.h
index 40bbd1c83..e21a0f917 100644
--- a/e2fsprogs/e2fs_lib.h
+++ b/e2fsprogs/e2fs_lib.h
@@ -31,7 +31,7 @@ int fgetsetflags(const char *name, unsigned long *get_flags, unsigned long set_f
 /* Must be 1 for compatibility with `int long_format'. */
 #define PFOPT_LONG  1
 /* Print file attributes on an ext2 file system */
-void print_flags(FILE *f, unsigned long flags, unsigned options);
+void print_e2flags(FILE *f, unsigned long flags, unsigned options);
 
 extern const uint32_t e2attr_flags_value[];
 extern const char e2attr_flags_sname[];
diff --git a/e2fsprogs/lsattr.c b/e2fsprogs/lsattr.c
index 13eeb35f5..066af86c7 100644
--- a/e2fsprogs/lsattr.c
+++ b/e2fsprogs/lsattr.c
@@ -45,10 +45,10 @@ static void list_attributes(const char *name)
 
 	if (option_mask32 & OPT_PF_LONG) {
 		printf("%-28s ", name);
-		print_flags(stdout, fsflags, PFOPT_LONG);
+		print_e2flags(stdout, fsflags, PFOPT_LONG);
 		bb_putchar('\n');
 	} else {
-		print_flags(stdout, fsflags, 0);
+		print_e2flags(stdout, fsflags, 0);
 		printf(" %s\n", name);
 	}
 
diff --git a/e2fsprogs/old_e2fsprogs/e2p/e2p.h b/e2fsprogs/old_e2fsprogs/e2p/e2p.h
index cae28f115..452470047 100644
--- a/e2fsprogs/old_e2fsprogs/e2p/e2p.h
+++ b/e2fsprogs/old_e2fsprogs/e2p/e2p.h
@@ -13,7 +13,7 @@
 #define EXT3_FEATURE_INCOMPAT_EXTENTS           0x0040
 #endif
 
-/* `options' for print_flags() */
+/* `options' for print_e2flags() */
 
 #define PFOPT_LONG  1 /* Must be 1 for compatibility with `int long_format'. */
 
diff --git a/e2fsprogs/old_e2fsprogs/lsattr.c b/e2fsprogs/old_e2fsprogs/lsattr.c
index 277ec7c2c..294bf2f2e 100644
--- a/e2fsprogs/old_e2fsprogs/lsattr.c
+++ b/e2fsprogs/old_e2fsprogs/lsattr.c
@@ -56,10 +56,10 @@ static void list_attributes(const char *name)
 
 	if (flags & OPT_PF_LONG) {
 		printf("%-28s ", name);
-		print_flags(stdout, fsflags, PFOPT_LONG);
+		print_e2flags(stdout, fsflags, PFOPT_LONG);
 		bb_putchar('\n');
 	} else {
-		print_flags(stdout, fsflags, 0);
+		print_e2flags(stdout, fsflags, 0);
 		printf(" %s\n", name);
 	}
 
diff --git a/include/libbb.h b/include/libbb.h
index c4d802ffd..97aae0bb4 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1304,6 +1304,14 @@ extern const char bb_default_login_shell[];
 /* "sh" */
 #define DEFAULT_SHELL_SHORT_NAME     (bb_default_login_shell+6)
 
+typedef struct masks_labels_t {
+	const char *labels;
+	const int masks[];
+} masks_labels_t;
+
+int print_flags_separated(const int *masks, const char *labels,
+		int flags, const char *separator);
+extern int print_flags(const masks_labels_t *ml, int flags);
 
 #if ENABLE_FEATURE_DEVFS
 # define CURRENT_VC "/dev/vc/0"
diff --git a/libbb/Kbuild b/libbb/Kbuild
index 201d795ad..7bb0f3bfe 100644
--- a/libbb/Kbuild
+++ b/libbb/Kbuild
@@ -68,6 +68,7 @@ lib-y += perror_nomsg.o
 lib-y += perror_nomsg_and_die.o
 lib-y += pidfile.o
 lib-y += printable.o
+lib-y += print_flags.o
 lib-y += process_escape_sequence.o
 lib-y += procps.o
 lib-y += ptr_to_globals.o
diff --git a/miscutils/hdparm.c b/miscutils/hdparm.c
index aa95b89b0..983de6d7b 100644
--- a/miscutils/hdparm.c
+++ b/miscutils/hdparm.c
@@ -1228,54 +1228,46 @@ static void dump_identity(const struct hd_driveid *id)
 		if (id->tPIO >= 2) printf("pio2 ");
 	}
 	if (id->field_valid & 2) {
-		if (id->eide_pio_modes & 1) printf("pio3 ");
-		if (id->eide_pio_modes & 2) printf("pio4 ");
-		if (id->eide_pio_modes &~3) printf("pio? ");
+		static const masks_labels_t pio_modes = {
+			.masks = { 1, 2, ~3 },
+			.labels = "pio3 \0""pio4 \0""pio? \0",
+		};
+		print_flags(&pio_modes, id->eide_pio_modes);
 	}
 	if (id->capability & 1) {
 		if (id->dma_1word | id->dma_mword) {
+			static const int dma_wmode_masks[] = { 0x100, 1, 0x200, 2, 0x400, 4, 0xf800, 0xf8 };
 			printf("\n DMA modes:  ");
-			if (id->dma_1word & 0x100) bb_putchar('*');
-			if (id->dma_1word & 1) printf("sdma0 ");
-			if (id->dma_1word & 0x200) bb_putchar('*');
-			if (id->dma_1word & 2) printf("sdma1 ");
-			if (id->dma_1word & 0x400) bb_putchar('*');
-			if (id->dma_1word & 4) printf("sdma2 ");
-			if (id->dma_1word & 0xf800) bb_putchar('*');
-			if (id->dma_1word & 0xf8) printf("sdma? ");
-			if (id->dma_mword & 0x100) bb_putchar('*');
-			if (id->dma_mword & 1) printf("mdma0 ");
-			if (id->dma_mword & 0x200) bb_putchar('*');
-			if (id->dma_mword & 2) printf("mdma1 ");
-			if (id->dma_mword & 0x400) bb_putchar('*');
-			if (id->dma_mword & 4) printf("mdma2 ");
-			if (id->dma_mword & 0xf800) bb_putchar('*');
-			if (id->dma_mword & 0xf8) printf("mdma? ");
+			print_flags_separated(dma_wmode_masks,
+				"*\0""sdma0 \0""*\0""sdma1 \0""*\0""sdma2 \0""*\0""sdma? \0",
+				id->dma_1word, NULL);
+			print_flags_separated(dma_wmode_masks,
+				"*\0""mdma0\0""*\0""mdma1\0""*\0""mdma2\0""*\0""mdma?\0",
+				id->dma_mword, NULL);
 		}
 	}
 	if (((id->capability & 8) || (id->field_valid & 2)) && id->field_valid & 4) {
+		static const masks_labels_t ultra_modes1 = {
+			.masks = { 0x100, 0x001, 0x200, 0x002, 0x400, 0x004 },
+			.labels = "*\0""udma0 \0""*\0""udma1 \0""*\0""udma2 \0",
+		};
+			
 		printf("\n UDMA modes: ");
-		if (id->dma_ultra & 0x100) bb_putchar('*');
-		if (id->dma_ultra & 0x001) printf("udma0 ");
-		if (id->dma_ultra & 0x200) bb_putchar('*');
-		if (id->dma_ultra & 0x002) printf("udma1 ");
-		if (id->dma_ultra & 0x400) bb_putchar('*');
-		if (id->dma_ultra & 0x004) printf("udma2 ");
+		print_flags(&ultra_modes1, id->dma_ultra);
 #ifdef __NEW_HD_DRIVE_ID
 		if (id->hw_config & 0x2000) {
 #else /* !__NEW_HD_DRIVE_ID */
 		if (id->word93 & 0x2000) {
 #endif /* __NEW_HD_DRIVE_ID */
-			if (id->dma_ultra & 0x0800) bb_putchar('*');
-			if (id->dma_ultra & 0x0008) printf("udma3 ");
-			if (id->dma_ultra & 0x1000) bb_putchar('*');
-			if (id->dma_ultra & 0x0010) printf("udma4 ");
-			if (id->dma_ultra & 0x2000) bb_putchar('*');
-			if (id->dma_ultra & 0x0020) printf("udma5 ");
-			if (id->dma_ultra & 0x4000) bb_putchar('*');
-			if (id->dma_ultra & 0x0040) printf("udma6 ");
-			if (id->dma_ultra & 0x8000) bb_putchar('*');
-			if (id->dma_ultra & 0x0080) printf("udma7 ");
+			static const masks_labels_t ultra_modes2 = {
+				.masks = { 0x0800, 0x0008, 0x1000, 0x0010,
+					0x2000, 0x0020, 0x4000, 0x0040,
+					0x8000, 0x0080 },
+				.labels = "*\0""udma3 \0""*\0""udma4 \0"
+					"*\0""udma5 \0""*\0""udma6 \0"
+					"*\0""udma7 \0"
+			};
+			print_flags(&ultra_modes2, id->dma_ultra);
 		}
 	}
 	printf("\n AdvancedPM=%s", (!(id_regs[83] & 8)) ? "no" : "yes");
diff --git a/networking/arp.c b/networking/arp.c
index f42e09f7c..f85a91022 100644
--- a/networking/arp.c
+++ b/networking/arp.c
@@ -313,6 +313,26 @@ static void
 arp_disp(const char *name, char *ip, int type, int arp_flags,
 		 char *hwa, char *mask, char *dev)
 {
+	static const int arp_masks[] = {
+		ATF_PERM, ATF_PUBL, 
+#ifdef HAVE_ATF_MAGIC
+		ATF_MAGIC,
+#endif
+#ifdef HAVE_ATF_DONTPUB
+		ATF_DONTPUB,
+#endif
+		ATF_USETRAILERS,
+	};
+	static const char arp_labels[] ALIGN1 = "PERM\0""PUP\0"
+#ifdef HAVE_ATF_MAGIC
+		"AUTO\0"
+#endif
+#ifdef HAVE_ATF_DONTPUB
+		"DONTPUB\0"
+#endif
+		"TRAIL\0"
+	;
+
 	const struct hwtype *xhw;
 
 	xhw = get_hwntype(type);
@@ -333,22 +353,8 @@ arp_disp(const char *name, char *ip, int type, int arp_flags,
 	if (arp_flags & ATF_NETMASK)
 		printf("netmask %s ", mask);
 
-	if (arp_flags & ATF_PERM)
-		printf("PERM ");
-	if (arp_flags & ATF_PUBL)
-		printf("PUP ");
-#ifdef HAVE_ATF_MAGIC
-	if (arp_flags & ATF_MAGIC)
-		printf("AUTO ");
-#endif
-#ifdef HAVE_ATF_DONTPUB
-	if (arp_flags & ATF_DONTPUB)
-		printf("DONTPUB ");
-#endif
-	if (arp_flags & ATF_USETRAILERS)
-		printf("TRAIL ");
-
-	printf("on %s\n", dev);
+	print_flags_separated(arp_masks, arp_labels, arp_flags, " ");
+	printf(" on %s\n", dev);
 }
 
 /* Display the contents of the ARP cache in the kernel. */
diff --git a/networking/libiproute/ipaddress.c b/networking/libiproute/ipaddress.c
index 07b27870d..faa3f2d06 100644
--- a/networking/libiproute/ipaddress.c
+++ b/networking/libiproute/ipaddress.c
@@ -45,16 +45,15 @@ typedef struct filter_t {
 
 static void print_link_flags(unsigned flags, unsigned mdown)
 {
+	static const int flag_masks[] = {
+		IFF_LOOPBACK, IFF_BROADCAST, IFF_POINTOPOINT,
+		IFF_MULTICAST, IFF_NOARP, IFF_UP, IFF_LOWER_UP };
+	static const char flag_labels[] ALIGN1 =
+		"LOOPBACK\0""BROADCAST\0""POINTOPOINT\0"
+		"MULTICAST\0""NOARP\0""UP\0""LOWER_UP\0";
+
 	bb_putchar('<');
 	flags &= ~IFF_RUNNING;
-#define _PF(f) if (flags & IFF_##f) { \
-		  flags &= ~IFF_##f; \
-		  printf(#f "%s", flags ? "," : ""); }
-	_PF(LOOPBACK);
-	_PF(BROADCAST);
-	_PF(POINTOPOINT);
-	_PF(MULTICAST);
-	_PF(NOARP);
 #if 0
 	_PF(ALLMULTI);
 	_PF(PROMISC);
@@ -66,9 +65,7 @@ static void print_link_flags(unsigned flags, unsigned mdown)
 	_PF(PORTSEL);
 	_PF(NOTRAILERS);
 #endif
-	_PF(UP);
-	_PF(LOWER_UP);
-#undef _PF
+	flags = print_flags_separated(flag_masks, flag_labels, flags, ",");
 	if (flags)
 		printf("%x", flags);
 	if (mdown)
diff --git a/util-linux/fdisk_osf.c b/util-linux/fdisk_osf.c
index e281ea5d9..30c42553b 100644
--- a/util-linux/fdisk_osf.c
+++ b/util-linux/fdisk_osf.c
@@ -502,6 +502,8 @@ xbsd_print_disklabel(int show_all)
 	int i, j;
 
 	if (show_all) {
+		static const int d_masks[] = { BSD_D_REMOVABLE, BSD_D_ECC, BSD_D_BADSECT };
+
 #if defined(__alpha__)
 		printf("# %s:\n", disk_device);
 #else
@@ -513,13 +515,8 @@ xbsd_print_disklabel(int show_all)
 			printf("type: %d\n", lp->d_type);
 		printf("disk: %.*s\n", (int) sizeof(lp->d_typename), lp->d_typename);
 		printf("label: %.*s\n", (int) sizeof(lp->d_packname), lp->d_packname);
-		printf("flags:");
-		if (lp->d_flags & BSD_D_REMOVABLE)
-			printf(" removable");
-		if (lp->d_flags & BSD_D_ECC)
-			printf(" ecc");
-		if (lp->d_flags & BSD_D_BADSECT)
-			printf(" badsect");
+		printf("flags: ");
+		print_flags_separated(d_masks, "removable\0""ecc\0""badsect\0", lp->d_flags, " "); 
 		bb_putchar('\n');
 		/* On various machines the fields of *lp are short/int/long */
 		/* In order to avoid problems, we cast them all to long. */