xresources patch

config.def.h

@@ -4,12 +4,22 @@ static const char *group = "nogroup";
 
 static const char *colorname[NUMCOLS] = {
     [BACKGROUND] = "white",
-	[INIT] =   "2d2d2d",     /* after initialization */
+	[INIT] =  "2d2d2d",     /* after initialization */
 	[INPUT] =  "#005577",   /* during input */
 	[FAILED] = "#CC3333",   /* wrong password */
 	[CAPS] = "yellow",         /* CapsLock on */
 };
 
+/*
+ * Xresources preferences to load at startup
+ */
+ResourcePref resources[] = {
+		{ "color0",       STRING,  &colorname[INIT] },
+		{ "color4",       STRING,  &colorname[INPUT] },
+		{ "color1",       STRING,  &colorname[FAILED] },
+		{ "color3",       STRING,  &colorname[CAPS] },
+};
+
 /* treat a cleared input like a wrong password (color) */
 static const int failonclear = 1;
 

patches/slock-xresources-20191126-53e56c7.diff

@@ -0,0 +1,159 @@
+From 53e56c751b3f2be4154760788850c51dbffc0add Mon Sep 17 00:00:00 2001
+From: Arnas Udovicius <zordsdavini@gmail.com>
+Date: Tue, 26 Nov 2019 16:16:15 +0200
+Subject: [PATCH] Read colors from Xresources
+
+---
+ config.def.h | 14 +++++++++--
+ slock.c      | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++
+ util.h       |  3 +++
+ 3 files changed, 83 insertions(+), 2 deletions(-)
+
+diff --git a/config.def.h b/config.def.h
+index 6288856..bfc1ba0 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -3,11 +3,21 @@ static const char *user  = "nobody";
+ static const char *group = "nogroup";
+ 
+ static const char *colorname[NUMCOLS] = {
+-	[INIT] =   "black",     /* after initialization */
+-	[INPUT] =  "#005577",   /* during input */
++	[INIT] = "black",       /* after initialization */
++	[INPUT] = "#005577",    /* during input */
+ 	[FAILED] = "#CC3333",   /* wrong password */
+ 	[CAPS] = "red",         /* CapsLock on */
+ };
+ 
++/*
++ * Xresources preferences to load at startup
++ */
++ResourcePref resources[] = {
++		{ "color0",       STRING,  &colorname[INIT] },
++		{ "color4",       STRING,  &colorname[INPUT] },
++		{ "color1",       STRING,  &colorname[FAILED] },
++		{ "color3",       STRING,  &colorname[CAPS] },
++};
++
+ /* treat a cleared input like a wrong password (color) */
+ static const int failonclear = 1;
+diff --git a/slock.c b/slock.c
+index 5f4fb7a..2395547 100644
+--- a/slock.c
++++ b/slock.c
+@@ -6,6 +6,7 @@
+ 
+ #include <ctype.h>
+ #include <errno.h>
++#include <math.h>
+ #include <grp.h>
+ #include <pwd.h>
+ #include <stdarg.h>
+@@ -19,6 +20,7 @@
+ #include <X11/Xlib.h>
+ #include <X11/Xutil.h>
+ #include <X11/XKBlib.h>
++#include <X11/Xresource.h>
+ 
+ #include "arg.h"
+ #include "util.h"
+@@ -46,6 +48,19 @@ struct xrandr {
+ 	int errbase;
+ };
+ 
++/* Xresources preferences */
++enum resource_type {
++	STRING = 0,
++	INTEGER = 1,
++	FLOAT = 2
++};
++
++typedef struct {
++	char *name;
++	enum resource_type type;
++	void *dst;
++} ResourcePref;
++
+ #include "config.h"
+ 
+ static void
+@@ -306,6 +321,57 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
+ 	return NULL;
+ }
+ 
++int
++resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst)
++{
++	char **sdst = dst;
++	int *idst = dst;
++	float *fdst = dst;
++
++	char fullname[256];
++	char fullclass[256];
++	char *type;
++	XrmValue ret;
++
++	snprintf(fullname, sizeof(fullname), "%s.%s", "slock", name);
++	snprintf(fullclass, sizeof(fullclass), "%s.%s", "Slock", name);
++	fullname[sizeof(fullname) - 1] = fullclass[sizeof(fullclass) - 1] = '\0';
++
++	XrmGetResource(db, fullname, fullclass, &type, &ret);
++	if (ret.addr == NULL || strncmp("String", type, 64))
++		return 1;
++
++	switch (rtype) {
++	case STRING:
++		*sdst = ret.addr;
++		break;
++	case INTEGER:
++		*idst = strtoul(ret.addr, NULL, 10);
++		break;
++	case FLOAT:
++		*fdst = strtof(ret.addr, NULL);
++		break;
++	}
++	return 0;
++}
++
++void
++config_init(Display *dpy)
++{
++	char *resm;
++	XrmDatabase db;
++	ResourcePref *p;
++
++	XrmInitialize();
++	resm = XResourceManagerString(dpy);
++	if (!resm)
++		return;
++
++	db = XrmGetStringDatabase(resm);
++	for (p = resources; p < resources + LEN(resources); p++)
++		resource_load(db, p->name, p->type, p->dst);
++}
++
+ static void
+ usage(void)
+ {
+@@ -364,6 +430,8 @@ main(int argc, char **argv) {
+ 	if (setuid(duid) < 0)
+ 		die("slock: setuid: %s\n", strerror(errno));
+ 
++	config_init(dpy);
++
+ 	/* check for Xrandr support */
+ 	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);
+ 
+diff --git a/util.h b/util.h
+index 6f748b8..148dbc1 100644
+--- a/util.h
++++ b/util.h
+@@ -1,2 +1,5 @@
++/* macros */
++#define LEN(a)			(sizeof(a) / sizeof(a)[0])
++
+ #undef explicit_bzero
+ void explicit_bzero(void *, size_t);
+-- 
+2.24.0
+

slock.c

@@ -7,6 +7,7 @@
 
 #include <ctype.h>
 #include <errno.h>
+#include <math.h>
 #include <grp.h>
 #include <pwd.h>
 #include <stdarg.h>
@@ -24,6 +25,7 @@
 #include <X11/Xutil.h>
 #include <X11/XF86keysym.h>
 #include <X11/XKBlib.h>
+#include <X11/Xresource.h>
 #include <Imlib2.h>
 
 #include "arg.h"
@@ -40,6 +42,19 @@ enum {
 	NUMCOLS
 };
 
+/* Xresources preferences */
+enum resource_type {
+	STRING = 0,
+	INTEGER = 1,
+	FLOAT = 2
+};
+
+typedef struct {
+	char *name;
+	enum resource_type type;
+	void *dst;
+} ResourcePref;
+
 #include "config.h"
 
 struct lock {
@@ -397,6 +412,57 @@ lockscreen(Display *dpy, struct xrandr *rr, int screen)
 	return NULL;
 }
 
+int
+resource_load(XrmDatabase db, char *name, enum resource_type rtype, void *dst)
+{
+	char **sdst = dst;
+	int *idst = dst;
+	float *fdst = dst;
+
+	char fullname[256];
+	char fullclass[256];
+	char *type;
+	XrmValue ret;
+
+	snprintf(fullname, sizeof(fullname), "%s.%s", "slock", name);
+	snprintf(fullclass, sizeof(fullclass), "%s.%s", "Slock", name);
+	fullname[sizeof(fullname) - 1] = fullclass[sizeof(fullclass) - 1] = '\0';
+
+	XrmGetResource(db, fullname, fullclass, &type, &ret);
+	if (ret.addr == NULL || strncmp("String", type, 64))
+		return 1;
+
+	switch (rtype) {
+	case STRING:
+		*sdst = ret.addr;
+		break;
+	case INTEGER:
+		*idst = strtoul(ret.addr, NULL, 10);
+		break;
+	case FLOAT:
+		*fdst = strtof(ret.addr, NULL);
+		break;
+	}
+	return 0;
+}
+
+void
+config_init(Display *dpy)
+{
+	char *resm;
+	XrmDatabase db;
+	ResourcePref *p;
+
+	XrmInitialize();
+	resm = XResourceManagerString(dpy);
+	if (!resm)
+		return;
+
+	db = XrmGetStringDatabase(resm);
+	for (p = resources; p < resources + LEN(resources); p++)
+		resource_load(db, p->name, p->type, p->dst);
+}
+
 static void
 usage(void)
 {
@@ -455,6 +521,8 @@ main(int argc, char **argv) {
 	if (setuid(duid) < 0)
 		die("slock: setuid: %s\n", strerror(errno));
 
+	config_init(dpy);
+
 	/*Create screenshot Image*/
 	Screen *scr = ScreenOfDisplay(dpy, DefaultScreen(dpy));
 	image = imlib_create_image(scr->width,scr->height);

util.h

@@ -1,2 +1,5 @@
+/* macros */
+#define LEN(a)			(sizeof(a) / sizeof(a)[0])
+
 #undef explicit_bzero
 void explicit_bzero(void *, size_t);