Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild

After https://fedoraproject.org/wiki/Changes/RPMSuportForSystemdSysusers,
rpm will handle account creation automatically.

.gitignore

@@ -4,3 +4,4 @@ lcdproc-0.5.3.tar.gz
 /lcdproc-0.5.6.tar.gz
 /lcdproc-0.5.7.tar.gz
 /lcdproc-781b311.tar.gz
+/lcdproc-5c21e8c.tar.gz

0001-clients-lcdproc-MemTop-be-smarter-about-how-much-pro.patch

@@ -1,96 +0,0 @@
-From f10ab9b513241a08af69f50f985b972715e27f07 Mon Sep 17 00:00:00 2001
-From: Hans de Goede <hdegoede@redhat.com>
-Date: Thu, 4 Jul 2019 11:45:09 +0200
-Subject: [PATCH] clients/lcdproc: MemTop: be smarter about how much processes
- to show
-
-Instead of hardcoding the number of processes to 5, which only works
-well for LCDs with 4 lines or less, do the following:
-
-On LCDs with 4 lines or less show 5 processes (no change)
-
-On LCDs with 5 lines we have 4 free lines, showing 5 processes with
-scrolling here makes things look like we scroll 1 line down and then 1
-line back up again, which looks wrong (*). So show 4 processes here.
-
-On LCDs with 6 lines or more, show as many processes as will fit so that
-we use the entire screen.
-
-Note that the last 2 cases both come down to showing as many lines as
-will fit.
-
-*) This happens e.g. on the LCD panel in various Logitech keyboards, which
-fits 5 lines.
-
-Signed-off-by: Hans de Goede <hdegoede@redhat.com>
----
- clients/lcdproc/mem.c | 27 ++++++++++++++++++++++-----
- 1 file changed, 22 insertions(+), 5 deletions(-)
-
-diff --git a/clients/lcdproc/mem.c b/clients/lcdproc/mem.c
-index 187d421..ddec98c 100644
---- a/clients/lcdproc/mem.c
-+++ b/clients/lcdproc/mem.c
-@@ -224,7 +224,7 @@ sort_procs(void *a, void *b)
- 
- 
- /**
-- * Mem Top Screen displays info about top 5 memory hogs...
-+ * Mem Top Screen displays info about top memory hogs...
-  *
-  *\verbatim
-  *
-@@ -246,8 +246,25 @@ int
- mem_top_screen(int rep, int display, int *flags_ptr)
- {
- 	LinkedList *procs;
-+	int lines;
- 	int i;
- 
-+	/* On screen <= 4 lines show info for 5 processes and use scrolling */
-+	if (lcd_hgt <= 4)
-+		lines = 5;
-+	/*
-+	 * On 5 lines displays we have 4 free lines, using 5 lines with
-+	 * scrolling here makes things look like we scroll 1 line down and
-+	 * then 1 line back up again, which looks wrong. So we use as many
-+	 * lines as fit (4) instead of 5 on a 5 lines display, so that we do
-+	 * not get the weird scrolling.
-+	 *
-+	 * Likewise for > 5 lines we also want to show as many lines as fit
-+	 * so that we use the entire screen.
-+	 */
-+	else
-+		lines = lcd_hgt - 1;
-+
- 	if ((*flags_ptr & INITIALIZED) == 0) {
- 		*flags_ptr |= INITIALIZED;
- 
-@@ -260,12 +277,12 @@ mem_top_screen(int rep, int display, int *flags_ptr)
- 		sock_send_string(sock, "widget_add S f frame\n");
- 
- 		/* scroll rate: 1 line every X ticks (= 1/8 sec) */
--		sock_printf(sock, "widget_set S f 1 2 %i %i %i 5 v %i\n",
--			    lcd_wid, lcd_hgt, lcd_wid,
-+		sock_printf(sock, "widget_set S f 1 2 %i %i %i %i v %i\n",
-+			    lcd_wid, lcd_hgt, lcd_wid, lines,
- 			    ((lcd_hgt >= 4) ? 8 : 12));
- 
- 		/* frame contents */
--		for (i = 1; i <= 5; i++) {
-+		for (i = 1; i <= lines; i++) {
- 			sock_printf(sock, "widget_add S %i string -in f\n", i);
- 		}
- 		sock_send_string(sock, "widget_set S 1 1 1 Checking...\n");
-@@ -291,7 +308,7 @@ mem_top_screen(int rep, int display, int *flags_ptr)
- 	LL_Rewind(procs);
- 	LL_Sort(procs, sort_procs);
- 	LL_Rewind(procs);
--	for (i = 1; i <= 5; i++) {
-+	for (i = 1; i <= lines; i++) {
- 		procinfo_type *p = LL_Get(procs);
- 
- 		if (p != NULL) {
--- 
-2.21.0
-

0001-server-drivers-g15-Add-support-for-the-LCD-on-Logite.patch

@@ -0,0 +1,33 @@
+From 1c6be22c5eeea9a7f83192153b282b6002b89923 Mon Sep 17 00:00:00 2001
+From: Hans de Goede <hdegoede@redhat.com>
+Date: Mon, 12 Apr 2021 22:44:06 +0200
+Subject: [PATCH] server/drivers/g15: Add support for the LCD on Logitech Z-10
+ speakers
+
+The LCD on Logitech Z-10 speakers uses the exact same protocol as on
+the g15 keyboards, add the USB-id + HID-descriptor header of the
+USB-intf. for the LCD.
+
+Signed-off-by: Hans de Goede <hdegoede@redhat.com>
+---
+ server/drivers/g15.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/server/drivers/g15.c b/server/drivers/g15.c
+index 154e253..48f5fe5 100644
+--- a/server/drivers/g15.c
++++ b/server/drivers/g15.c
+@@ -90,6 +90,10 @@ static const struct lib_hidraw_id hidraw_ids[] = {
+ 	{ { BUS_USB, 0x046d, 0xc22e },
+ 	  { 0x05, 0x0c, 0x09, 0x01, 0xa1, 0x01, 0x85, 0x02,
+ 	    0x15, 0x00, 0x25, 0x01, 0x75, 0x01, 0x95, 0x07 } },
++	/* Z-10 */
++	{ { BUS_USB, 0x046d, 0x0a07 },
++	  { 0x06, 0x00, 0xff, 0x09, 0x00, 0xa1, 0x01, 0x15,
++	    0x00, 0x26, 0xff, 0x00, 0x75, 0x08, 0x95, 0x08 } },
+ 	/* Terminator */
+ 	{}
+ };
+-- 
+2.31.1
+

90-lcdproc.rules

@@ -27,6 +27,9 @@ DEVPATH=="*/0003:046D:C227.*/hidraw/hidraw*", GOTO="lcdproc_lcd_found"
 DEVPATH=="*/0003:046D:C22D.*/hidraw/hidraw*", ATTRS{bInterfaceNumber}=="01", GOTO="lcdproc_lcd_found"
 DEVPATH=="*/0003:046D:C22E.*/hidraw/hidraw*", ATTRS{bInterfaceNumber}=="01", GOTO="lcdproc_lcd_found"
 
+# Logitech Z-10 speakers with G15 style LCD screen, note we only want interface 2
+DEVPATH=="*/0003:046D:0A07.*/hidraw/hidraw*", ATTRS{bInterfaceNumber}=="02", GOTO="lcdproc_lcd_found"
+
 ### 3. Check for input devices for LCD menu buttons ###
 
 # Logitech G15, G15 v2 and G510 Gaming and LCD menu keys
@@ -35,6 +38,8 @@ SUBSYSTEM=="input", KERNEL=="event*", ATTRS{name}=="Logitech Gaming Keyboard Gam
 SUBSYSTEM=="input", KERNEL=="event*", ATTRS{name}=="Logitech MX5000 Keyboard", GOTO="lcdproc_input_found"
 # Logitech MX5000 keyboard connected through its receiver in USB HID proxy mode
 SUBSYSTEM=="input", KERNEL=="event*", ATTRS{name}=="Logitech Wireless Keyboard PID:b305", GOTO="lcdproc_input_found"
+# Logitech Z-10 speakers LCD menu keys
+SUBSYSTEM=="input", KERNEL=="event*", ATTRS{name}=="Logitech Z-10 LCD Menu Keys", GOTO="lcdproc_input_found"
 
 
 ### Nothing found, leave ###

LCDd-hwdetect.sh

@@ -70,6 +70,10 @@ if [ -d /sys/bus/hid/devices ]; then
         0003:046D:C22E.*)
           add_device "g510"   "g15" "Logitech Gaming Keyboard Gaming Keys"
           ;;
+        # Logitech Z10 speakers
+        0003:046D:0A07.*)
+          add_device "z-10"   "g15" "Logitech Z-10 LCD Menu Keys"
+          ;;
       esac
     done
   popd > /dev/null
@@ -89,20 +93,27 @@ fi
 # Write LCDd.conf for the found device, also:
 # Disable the server screen in the rotation of screens
 # Disable the annoying blinking heartbeat by default
+# Disable title scrolling (set the speed to 0) most keyboard LCDs have
+#  a low refresh rate making the scrolling look terrible
 cat /etc/lcdproc/LCDd.conf.example | \
   sed -e "s/^Driver=curses/Driver=$lcd_driver/" \
       -e "s/#ServerScreen=no/ServerScreen=no/" \
-      -e "s/#Heartbeat=open/Heartbeat=off/" > \
+      -e "s/#Heartbeat=open/Heartbeat=off/" \
+      -e "s/#TitleSpeed=10/TitleSpeed=0/" > \
   /etc/lcdproc/LCDd.conf
 
 # Add input-device config if specified
 # Also set prev / next screen to up/down since non of the supported devices
 # has enough buttons to create mappings for both left and right
+# And uncomment the LeftKey and RightKey assignments so that they work
+# when they are available
 if [ "$input_name" ]; then
   sed -i -e "s|Driver=$lcd_driver|Driver=$lcd_driver\nDriver=linux_input|" \
          -e "s|PrevScreenKey=Left|PrevScreenKey=Up|" \
          -e "s|NextScreenKey=Right|NextScreenKey=Down|" \
          -e "s|# Device=/dev/input/event0|Device=\"$input_name\"|" \
+         -e "s|#LeftKey=Left|LeftKey=Left|" \
+         -e "s|#RightKey=Right|RightKey=Right|" \
     /etc/lcdproc/LCDd.conf
 fi
 
@@ -123,7 +134,7 @@ case "$lcd_device" in
            -e 's/KeyMatrix_4_4=Escape/KeyDirect_2=Right/' \
       /etc/lcdproc/LCDd.conf
     ;;
-  "g15"|"g15-2"|"g510")
+  "g15"|"g15-2"|"g510"|"z-10")
     sed -i -e "s/# specify a non-default key map/# Keymap for the G15's 5 LCD-menu buttons/" \
            -e 's/#key=1,Escape/key=0x2b8,Escape/' \
            -e 's/#key=28,Enter/key=0x2b9,Left/' \

LCDd.service

@@ -6,7 +6,7 @@ After=syslog.target
 Type=forking
 ExecStart=/usr/sbin/LCDd -c /etc/lcdproc/LCDd.conf
 User=root
-Group=nobody
+Group=lcdd
 
 [Install]
 WantedBy=multi-user.target

lcdproc-gcc10.patch

@@ -1,23 +0,0 @@
-diff -up lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.c.me lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.c
---- lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.c.me	2020-02-24 13:48:32.277935940 +0100
-+++ lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.c	2020-02-24 13:49:12.083293814 +0100
-@@ -32,6 +32,7 @@
- #define UNSET_INT -1
- #define UNSET_STR "\01"
- 
-+IfaceInfo iface[MAX_INTERFACES];
- 
- static int iface_count = 0;	/* number of interfaces */
- static char unit_label[10] = "B";	/* default unit label is Bytes */
-diff -up lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.h.me lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.h
---- lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.h.me	2020-02-24 13:47:42.332486918 +0100
-+++ lcdproc-781b3113a592d75a29aa5024a94c2fd6b4592f87/clients/lcdproc/iface.h	2020-02-24 13:48:09.954735252 +0100
-@@ -18,7 +18,7 @@
- /** max number of interfaces in multi-interface mode */
- #define MAX_INTERFACES 3
- 
--IfaceInfo iface[MAX_INTERFACES];	/* interface info */
-+extern IfaceInfo iface[MAX_INTERFACES];	/* interface info */
- 
- /** Update screen content */
- int iface_screen(int rep, int display, int *flags_ptr);

lcdproc.spec

@@ -1,12 +1,13 @@
-%global commit 781b3113a592d75a29aa5024a94c2fd6b4592f87
-%global commitdate 20190625
+%global commit 5c21e8c75fbab53574275c8007f5af746e333144
+%global commitdate 20210209
 %global shortcommit %(c=%{commit}; echo ${c:0:7})
 
 Summary:        Display real-time system information on a 20x4 back-lit LCD
 Name:           lcdproc
 Version:        0.5.9
-Release:        6.%{commitdate}git%{shortcommit}%{?dist}
-License:        GPLv2
+Release:        26.%{commitdate}git%{shortcommit}%{?dist}
+# Automatically converted from old format: GPLv2 - review is highly recommended.
+License:        GPL-2.0-only
 URL:            http://lcdproc.org
 Source0:        https://github.com/%{name}/%{name}/archive/%{commit}/%{name}-%{shortcommit}.tar.gz
 Source1:        lcdproc.service
@@ -15,8 +16,8 @@ Source3:        LCDd.service
 Source4:        LCDd-hwdetect.service
 Source5:        LCDd-hwdetect.sh
 Source6:        90-lcdproc.rules
-Patch1:         0001-clients-lcdproc-MemTop-be-smarter-about-how-much-pro.patch
-Patch2:         lcdproc-gcc10.patch
+Source7:        lcdproc.sysusers
+Patch1:         0001-server-drivers-g15-Add-support-for-the-LCD-on-Logite.patch
 # lcdconf.conf tweaks:
 # 1. Enable ProcSize, this is quite useful to have
 # 2. Disable TimeDate, its info is duplicate with the MiniClock and it is ugly
@@ -26,7 +27,7 @@ Patch2:         lcdproc-gcc10.patch
 Patch99:        lcdproc-conf.patch
 
 BuildRequires:  perl-generators
-BuildRequires:  systemd
+BuildRequires:  systemd-rpm-macros
 BuildRequires:  doxygen
 BuildRequires:  graphviz
 
@@ -34,7 +35,7 @@ BuildRequires:  freetype-devel
 %ifnarch s390 s390x
 BuildRequires:  libhid-devel
 %endif
-BuildRequires:  libusb-devel
+BuildRequires:  libusb1-devel
 BuildRequires:  lirc-devel
 BuildRequires:  ncurses-devel
 BuildRequires:  openldap-devel
@@ -45,11 +46,8 @@ BuildRequires:  libXext-devel
 BuildRequires:  libftdi-devel
 BuildRequires:  libg15render-devel
 BuildRequires:  mx5000tools-devel
-%ifarch %{ix86} x86_64
-BuildRequires:  svgalib-devel
-%endif
-# For libftdi1
-BuildRequires: libtool autoconf automake
+BuildRequires:  libtool autoconf automake
+BuildRequires:  gcc make
 
 %{?systemd_requires}
 
@@ -74,6 +72,15 @@ touch -r TODO LCDd.conf
 
 
 %build
+# This package has a configure test which uses ASMs, but does not link the
+# resultant .o files.  As such the ASM test is always successful in a LTO
+# build.  We can force code generation with the -ffat-lto-objects to make
+# the test work as expected.
+#
+# -ffat-lto-objects is the default for F33, but will not be for F34, so we
+# make it explicit here.
+%define _lto_cflags -flto=auto -ffat-lto-objects
+
 autoreconf -vif
 %configure \
   --sysconfdir=%{_sysconfdir}/%{name} \
@@ -105,12 +112,14 @@ install -pm 0644 CREDITS.md ChangeLog.md README.md \
 install -d $RPM_BUILD_ROOT%{_unitdir}
 install -d $RPM_BUILD_ROOT%{_unitdir}/lcdproc.target.wants
 install -d $RPM_BUILD_ROOT%{_udevrulesdir}
+install -d $RPM_BUILD_ROOT%{_sysusersdir}
 install -pm 0644 %{SOURCE1}  $RPM_BUILD_ROOT%{_unitdir}
 install -pm 0644 %{SOURCE2}  $RPM_BUILD_ROOT%{_unitdir}
 install -pm 0644 %{SOURCE3}  $RPM_BUILD_ROOT%{_unitdir}
 install -pm 0644 %{SOURCE4}  $RPM_BUILD_ROOT%{_unitdir}
 install -pm 0755 %{SOURCE5}  $RPM_BUILD_ROOT%{_sbindir}/LCDd-hwdetect
 install -pm 0644 %{SOURCE6}  $RPM_BUILD_ROOT%{_udevrulesdir}
+install -pm 0644 %{SOURCE7}  $RPM_BUILD_ROOT%{_sysusersdir}/lcdproc.conf
 for i in lcdproc.service LCDd.service LCDd-hwdetect.service; do
   ln -s ../$i $RPM_BUILD_ROOT%{_unitdir}/lcdproc.target.wants
 done
@@ -118,12 +127,13 @@ done
 #Disable default configuration
 #Thoses are only provided as an example since ncurses isn't a suitable default configuration.
 for f in LCDd.conf lcdproc.conf ; do
-mv $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/${f} \
-  $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/${f}.example
-touch $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/${f}
+  mv $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/${f} \
+    $RPM_BUILD_ROOT%{_sysconfdir}/%{name}/${f}.example
 done
 
 
+
+
 %post
 %systemd_post LCDd.service lcdproc.service
 
@@ -144,13 +154,82 @@ done
 %{_libdir}/lcdproc/
 %{_mandir}/man?/*
 %dir %{_sysconfdir}/%{name}
-%ghost %{_sysconfdir}/%{name}/*.conf
+%config %{_sysconfdir}/%{name}/*.conf
 %config %{_sysconfdir}/%{name}/*.conf.example
 %{_unitdir}/*
 %{_udevrulesdir}/90-%{name}.rules
+%{_sysusersdir}/lcdproc.conf
 
 
 %changelog
+* Thu Jul 24 2025 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-26.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_43_Mass_Rebuild
+
+* Tue Feb 11 2025 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 0.5.9-25.20210209git5c21e8c
+- Drop call to %sysusers_create_compat
+
+* Fri Jan 17 2025 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-24.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild
+
+* Mon Jul 29 2024 Miroslav Suchý <msuchy@redhat.com> - 0.5.9-23.20210209git5c21e8c
+- convert license to SPDX
+
+* Thu Jul 18 2024 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-22.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild
+
+* Thu Jan 25 2024 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-21.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
+
+* Sun Jan 21 2024 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-20.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild
+
+* Thu Jul 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-19.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild
+
+* Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-18.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
+
+* Thu Jul 21 2022 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-17.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_37_Mass_Rebuild
+
+* Thu Jan 20 2022 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-16.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_36_Mass_Rebuild
+
+* Thu Jul 22 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-15.20210209git5c21e8c
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild
+
+* Thu Apr 15 2021 Hans de Goede <hdegoede@redhat.com> - 0.5.9-14.20210209git5c21e8c
+- Sync with latest upstream git
+- Add support for LCD found on Logitech Z-10 speakers,
+  inc. autodetect by udev + automatic LCDd.conf generation by LCDd-hwdetect
+- Fix Logitech G15 family devices requiring a manual restart of LCDd
+  after a unplug + replug
+- Drop ghosting of /etc/lcdproc/*.conf files, these may contain user
+  modifications, so they should not be removed on package removal
+- This also fixes lcdexec.conf and lcdvc.conf not being packaged
+
+* Tue Mar 02 2021 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 0.5.9-13.20190625git781b311
+- Rebuilt for updated systemd-rpm-macros
+  See https://pagure.io/fesco/issue/2583.
+
+* Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-12.20190625git781b311
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
+
+* Tue Nov 24 21:06:08 GMT 2020 Peter Robinson <pbrobinson@fedoraproject.org> - 0.5.9-11.20190625git781b311
+- Build with libusb1
+
+* Thu Aug 20 2020 Jeff Law <law@redhat.com> - 0.5.9-10.20190625git781b311
+- Re-enable LTO
+
+* Tue Jul 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.5.9-9.20190625git781b311
+- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
+
+* Tue Jul 14 2020 Jeff Law <law@redhat.com> - 0.5.9-8.20190625git781b311
+- Disable LTO
+
+* Fri Mar 20 2020 Hans de Goede <hdegoede@redhat.com> - 0.5.9-7.20190625git781b311
+- Drop svgalib support, svgalib is being dropped from the distro (rhbz#1814816)
+
 * Mon Feb 24 2020 Than Ngo <than@redhat.com> - 0.5.9-6.git
 - Fixed FTBFS against gcc10
 

lcdproc.sysusers

@@ -0,0 +1 @@
+g lcdd -

sources

@@ -1 +1 @@
-SHA512 (lcdproc-781b311.tar.gz) = d70754ba136b6d020ad1e0b2a5953087a22278b806bd7163580e255d0db3c9af8eaad3347ca4d0fbf1f72ae076dfb0c212d6e0d6e665b8aa12a33aea840fb766
+SHA512 (lcdproc-5c21e8c.tar.gz) = cc0f6622bfc76382306d1419b76e9d9d16740722bc29568559f4b022e0747a2edb3fece8d3f3d5871972b778290bc6178bd2de3919b6eae019505551e91f93cb