Adding xresources patch

README.md

@@ -15,6 +15,8 @@ Refer to [https://tools.suckless.org/slock/](https://tools.suckless.org/slock/)
 
 ### Changelog:
 
+2019-11-27 - Added xresources patch
+
 2019-10-17 - Added capscolor, control clear, dpms, mediakeys, message, pam auth, quickcancel patches
 
 2019-10-16 - Introduced [flexipatch-finalizer](https://github.com/bakkeby/flexipatch-finalizer)
@@ -52,3 +54,6 @@ Refer to [https://tools.suckless.org/slock/](https://tools.suckless.org/slock/)
    - [unlockscreen](https://tools.suckless.org/slock/patches/unlock_screen/)
       - this patch keeps the screen unlocked, but keeps the input locked
       - that is, the screen is not affected by slock, but users will not be able to interact with the X session unless they enter the correct password
+
+   - [xresources](https://tools.suckless.org/slock/patches/xresources/)
+      - this patch adds the ability to get colors via Xresources

config.def.h

@@ -11,9 +11,26 @@ static const char *colorname[NUMCOLS] = {
 	#endif // CAPSCOLOR_PATCH
 	#if PAMAUTH_PATCH
 	[PAM] =    "#9400D3",   /* waiting for PAM */
-	#endif // CAPSCOLOR_PATCH
+	#endif // PAMAUTH_PATCH
 };
 
+#if XRESOURCES_PATCH
+/*
+ * Xresources preferences to load at startup
+ */
+ResourcePref resources[] = {
+		{ "color0",       STRING,  &colorname[INIT] },
+		{ "color4",       STRING,  &colorname[INPUT] },
+		{ "color1",       STRING,  &colorname[FAILED] },
+		#if CAPSCOLOR_PATCH
+		{ "color3",       STRING,  &colorname[CAPS] },
+		#endif // CAPSCOLOR_PATCH
+		#if PAMAUTH_PATCH
+		{ "color5",       STRING,  &colorname[PAM] },
+		#endif // PAMAUTH_PATCH
+};
+#endif // XRESOURCES_PATCH
+
 /* treat a cleared input like a wrong password (color) */
 static const int failonclear = 1;
 

patch/include.c

@@ -10,3 +10,7 @@
 #if PAMAUTH_PATCH
 #include "pamauth.c"
 #endif
+
+#if XRESOURCES_PATCH
+#include "xresources.c"
+#endif

patch/include.h

@@ -2,3 +2,7 @@
 #if PAMAUTH_PATCH
 #include "pamauth.h"
 #endif
+
+#if XRESOURCES_PATCH
+#include "xresources.h"
+#endif

patch/xresources.c

@@ -0,0 +1,52 @@
+#include <math.h>
+
+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);
+}

patch/xresources.h

@@ -0,0 +1,17 @@
+#include <X11/Xresource.h>
+
+/* macros */
+#define LEN(a) (sizeof(a) / sizeof(a)[0])
+
+/* Xresources preferences */
+enum resource_type {
+	STRING = 0,
+	INTEGER = 1,
+	FLOAT = 2
+};
+
+typedef struct {
+	char *name;
+	enum resource_type type;
+	void *dst;
+} ResourcePref;

patches.h

@@ -73,3 +73,8 @@
  * https://tools.suckless.org/slock/patches/unlock_screen/
  */
 #define UNLOCKSCREEN_PATCH 0
+
+/* This patch adds the ability to get colors via Xresources.
+ * https://tools.suckless.org/slock/patches/xresources/
+ */
+#define XRESOURCES_PATCH 0

slock.c

@@ -514,6 +514,10 @@ main(int argc, char **argv) {
 	if (setuid(duid) < 0)
 		die("slock: setuid: %s\n", strerror(errno));
 
+	#if XRESOURCES_PATCH
+	config_init(dpy);
+	#endif // XRESOURCES_PATCH
+
 	/* check for Xrandr support */
 	rr.active = XRRQueryExtension(dpy, &rr.evbase, &rr.errbase);