Merge everything from upstream except PR i3#280

.clang-format

@@ -8,3 +8,4 @@ IndentWidth: 4
 PointerBindsToType: false
 ColumnLimit: 0
 SpaceBeforeParens: ControlStatements
+SortIncludes: false

.travis.yml

@@ -7,11 +7,7 @@ language: c
 compiler:
   - gcc
   - clang
-addons:
-  apt:
-    packages:
-    - clang-format-3.5
 script:
-  - clang-format-3.5 -i *.[ch] && git diff --exit-code || (echo 'Code was not formatted using clang-format!'; false)
   - docker build --pull --no-cache --rm -t=i3lock -f travis/Dockerfile .
+  - docker run -e CC=$CC -v $PWD:/usr/src:rw i3lock /bin/sh -c 'clang-format-9 -i *.[ch] && git diff --exit-code || (echo "Code was not formatted using clang-format!"; false)'
   - docker run -e CC=$CC -v $PWD:/usr/src:rw i3lock /bin/sh -c 'autoreconf -fi && mkdir -p build && cd build && (../configure || (cat config.log; false)) && make -j V=1 CFLAGS="-Wformat -Wformat-security -Wextra -Wno-unused-parameter -Werror"'

configure.ac

@@ -66,6 +66,7 @@ AC_FUNC_FORK
 AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK
 AC_FUNC_STRNLEN
 AC_CHECK_FUNCS([atexit dup2 ftruncate getcwd gettimeofday localtime_r memchr memset mkdir rmdir setlocale socket strcasecmp strchr strdup strerror strncasecmp strndup strrchr strspn strstr strtol strtoul], , [AC_MSG_FAILURE([cannot find the $ac_func function, which i3lock requires])])
+AC_CHECK_FUNCS([explicit_bzero])
 
 # Checks for libraries.
 

i3lock.c

@@ -18,7 +18,6 @@
 #include <stdlib.h>
 #include <pwd.h>
 #include <sys/types.h>
-#include <string.h>
 #include <dirent.h>
 #include <unistd.h>
 #include <stdbool.h>
@@ -29,7 +28,7 @@
 #include <err.h>
 #include <errno.h>
 #include <assert.h>
-#ifdef __OpenBSD__
+#ifdef HAVE_EXPLICIT_BZERO
 #include <bsd_auth.h>
 #else
 #include <security/pam_appl.h>
@@ -45,7 +44,7 @@
 #include <xkbcommon/xkbcommon-x11.h>
 #include <cairo.h>
 #include <cairo/cairo-xcb.h>
-#ifdef __OpenBSD__
+#ifdef HAVE_EXPLICIT_BZERO
 #include <strings.h> /* explicit_bzero(3) */
 #endif
 #include <xcb/xcb_aux.h>
@@ -906,7 +905,7 @@ static void process_xkb_event(xcb_generic_event_t *gevent) {
  * and also redraw the image, if any.
  *
  */
-void handle_screen_resize(void) {
+static void handle_screen_resize(void) {
     xcb_get_geometry_cookie_t geomc;
     xcb_get_geometry_reply_t *geom;
     geomc = xcb_get_geometry(conn, screen->root);

i3lock.h

@@ -10,8 +10,9 @@
  * up on the X11 socket (!). */
  #define DEBUG(fmt, ...)                                            \
      do {                                                           \
-        if (debug_mode)                                   \
-            printf("[i3lock-debug] " fmt, ##__VA_ARGS__); \
+         if (debug_mode) {                                          \
+             fprintf(stderr, "[i3lock-debug] " fmt, ##__VA_ARGS__); \
+         }                                                          \
     } while (0)
 
 #endif

travis/Dockerfile

@@ -11,7 +11,7 @@ RUN echo 'APT::Acquire::Retries "5";' > /etc/apt/apt.conf.d/80retry
 # (3608 kB/s)). Hence, let’s stick with httpredir.debian.org (default) for now.
 
 # Install mk-build-deps (for installing the i3 build dependencies),
-# clang and clang-format-3.8 (for checking formatting and building with clang),
+# clang and clang-format-9 (for checking formatting and building with clang),
 # lintian (for checking spelling errors),
 # test suite dependencies (for running tests)
 RUN apt-get update && \
@@ -19,7 +19,7 @@ RUN apt-get update && \
     build-essential clang git autoconf automake libxcb-randr0-dev pkg-config libpam0g-dev \
     libcairo2-dev libxcb1-dev libxcb-dpms0-dev libxcb-image0-dev libxcb-util0-dev \
     libxcb-xrm-dev libev-dev libxcb-xinerama0-dev libxcb-xkb-dev libxkbcommon-dev \
-    libxkbcommon-x11-dev && \
+    libxkbcommon-x11-dev clang-format-9 && \
     rm -rf /var/lib/apt/lists/*
 
 WORKDIR /usr/src