First commit

1 files changed, 133 insertions, 0 deletions

diff --git a/dwmtimestatus.c b/dwmtimestatus.c
new file mode 100644
index 0000000..cd5c879
--- /dev/null
+++ b/dwmtimestatus.c
@@ -0,0 +1,133 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <assert.h>
+#include <string.h>
+#include <time.h>
+#include <getopt.h>
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <X11/Xproto.h>
+#include <X11/Xutil.h>
+
+struct status{
+	Display *dpy;
+	Window root;
+	char status[256];
+	const char *time_format;
+	unsigned int status_update_interval;
+};
+
+struct sigaction *s_act = NULL;
+struct status current_status = {0};
+XTextProperty status_props = {0};
+
+void sighandler( int si_code, siginfo_t *si_info, void *si_adr ){
+	int exit_status = EXIT_SUCCESS;
+	if ( si_code == SIGSEGV ){
+		fprintf( stderr, "error: SIGSEGV received: %s\n", strerror(errno) );
+		exit_status = EXIT_FAILURE;
+	}
+	else
+	{
+		fprintf( stdout, "Received signal %i, exiting\n", si_code );
+	}
+	if ( current_status.dpy != NULL ){
+		if ( XCloseDisplay(current_status.dpy) == BadGC )
+			fputs( "XCloseDisplay returned BadGC error\n", stderr );
+		current_status.dpy = NULL;
+	}
+	memset( (void*)&current_status, 0, sizeof(struct status) );
+	memset( (void*)&status_props, 0, sizeof(XTextProperty) );
+	free( s_act );
+	s_act = NULL;
+	exit( exit_status );
+}
+
+void update_status( struct status *status_info, XTextProperty *xprops ){
+	if ( status_info == NULL || xprops == NULL )
+		return;
+	XSetTextProperty( status_info->dpy, status_info->root, xprops, XA_WM_NAME );
+	XSync( status_info->dpy, 0 );
+	return;
+}
+
+void status_update_loop( struct status *cstatus, XTextProperty *status_properties ){
+	if ( cstatus == NULL || status_properties == NULL ){
+		fputs( "error: status struct pointer is NULL\n", stderr );
+		return;
+	}
+	time_t current_time = 0;
+	struct tm *time_info = NULL;
+	while ( 1 ){
+		memset( (void*)&cstatus->status, 0, sizeof(cstatus->status) * sizeof(char) );
+		current_time = time( NULL );
+		time_info = localtime( (const time_t*)&current_time );
+		if ( (status_properties->nitems = (long unsigned int)strftime((char*)&cstatus->status, (sizeof(cstatus->status) * sizeof(char)) - 1, cstatus->time_format, time_info)) <= 0 ){
+			sleep( cstatus->status_update_interval );
+			continue;
+		}
+		update_status( cstatus, status_properties );
+		sleep( cstatus->status_update_interval );
+	}
+	return;
+}
+
+int main( int argc, char **args ){
+	if ( argc < 5 ){
+		fprintf( stdout, "Usage: %s -i [update interval in seconds] -d [display] -f [time format]\n", args[0] );
+		exit( EXIT_SUCCESS );
+	}
+	s_act = (struct sigaction*)calloc( 1, sizeof(struct sigaction) );
+	if ( s_act == NULL ){
+		perror( "sigaction struct allocation failed" );
+		exit( EXIT_FAILURE );
+	}
+	if ( sigemptyset(&s_act->sa_mask) == -1 ){
+		perror( "failed to create empty sigset" );
+		free( s_act );
+		exit( EXIT_FAILURE );
+	}
+	s_act->sa_flags = SA_SIGINFO;
+	s_act->sa_sigaction = &sighandler;
+	if ( sigaction(SIGABRT, (const struct sigaction*)s_act, NULL) == -1 ){
+		perror( "failed to set SIGABRT handler" );
+		free( s_act );
+		exit( EXIT_FAILURE );
+	}
+	assert( sigaction(SIGSEGV, (const struct sigaction*)s_act, NULL) != -1 );
+	assert( sigaction(SIGINT, (const struct sigaction*)s_act, NULL) != -1 );
+	assert( sigaction(SIGTERM, (const struct sigaction*)s_act, NULL) != -1 );
+	assert( sigaction(SIGPIPE, (const struct sigaction*)s_act, NULL) != -1 );
+	memset( (void*)&current_status, 0, sizeof(struct status) );
+	memset( (void*)&status_props, 0, sizeof(XTextProperty) );
+	status_props.value = (unsigned char*)&current_status.status;
+	status_props.encoding = XA_STRING;
+	status_props.format = 8;
+	const char *optstring = "i:d:f:";
+	int opt_char = 0;
+	while ( (opt_char = getopt(argc, args, optstring)) != -1 ){
+		switch (opt_char){
+			case 'i':
+				current_status.status_update_interval = (unsigned int)strtoull( optarg, NULL, 10 );
+				assert( errno == 0 );
+				break;
+			case 'd':
+				current_status.dpy = XOpenDisplay( (_Xconst char*)optarg );
+				assert( current_status.dpy != NULL );
+				break;
+			case 'f':
+				current_status.time_format = (const char*)optarg;
+				assert( current_status.time_format != NULL && strlen(current_status.time_format) > 0 );
+				break;
+			default:
+				break;
+		}
+	}
+	current_status.root = DefaultRootWindow( current_status.dpy );
+	status_update_loop( &current_status, &status_props );
+	exit( EXIT_SUCCESS );
+}