Initial revision

src/libdraw/subfontname.c

@@ -0,0 +1,44 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+
+/*
+ * Default version: convert to file name
+ */
+
+char*
+subfontname(char *cfname, char *fname, int maxdepth)
+{
+	char *t, *u, tmp1[64], tmp2[64];
+	int i;
+
+	if(strcmp(cfname, "*default*") == 0)
+		return strdup(cfname);
+	t = cfname;
+	if(t[0] != '/'){
+		snprint(tmp2, sizeof tmp2, "%s", fname);
+		u = utfrrune(tmp2, '/');
+		if(u)
+			u[0] = 0;
+		else
+			strcpy(tmp2, ".");
+		snprint(tmp1, sizeof tmp1, "%s/%s", tmp2, t);
+		t = tmp1;
+	}
+
+	if(maxdepth > 8)
+		maxdepth = 8;
+
+	for(i=log2[maxdepth]; i>=0; i--){
+		/* try i-bit grey */
+		snprint(tmp2, sizeof tmp2, "%s.%d", t, i);
+		if(access(tmp2, AREAD) == 0)
+			return strdup(tmp2);
+	}
+
+	/* try default */
+	if(access(t, AREAD) == 0)
+		return strdup(t);
+
+	return nil;
+}