llow parsing of usage strings.

lib/libusb/usage.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: usage.c,v 1.6 2000/08/13 22:22:02 augustss Exp $	*/
+/*	$NetBSD: usage.c,v 1.7 2000/09/24 02:17:52 augustss Exp $	*/
 
 /*
  * Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org>
@@ -192,3 +192,40 @@ hid_usage_in_page(unsigned int u)
 	sprintf(b, "0x%04x", i);
 	return b;
 }
+
+int
+hid_parse_usage_page(const char *name)
+{
+	int k;
+
+	if (!pages)
+		errx(1, "no hid table\n");
+
+	for (k = 0; k < npages; k++)
+		if (strcmp(pages[k].name, name) == 0)
+			return pages[k].usage;
+	return -1;
+}
+
+/* XXX handle hex */
+int
+hid_parse_usage_in_page(const char *name)
+{
+	const char *sep = strchr(name, ':');
+	int k, j;
+	unsigned int l;
+
+	if (sep == NULL)
+		return -1;
+	l = sep - name;
+	for (k = 0; k < npages; k++)
+		if (strncmp(pages[k].name, name, l) == 0)
+			goto found;
+	return -1;
+ found:
+	sep++;
+	for (j = 0; j < pages[k].pagesize; j++)
+		if (strcmp(pages[k].page_contents[j].name, sep) == 0)
+			return (pages[k].usage << 16) | pages[k].page_contents[j].usage;
+	return (-1);
+}

lib/libusb/usb.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: usb.3,v 1.12 2000/09/24 02:13:24 augustss Exp $
+.\"	$NetBSD: usb.3,v 1.13 2000/09/24 02:17:52 augustss Exp $
 .\"
 .\" Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org>
 .\" All rights reserved.
@@ -67,6 +67,10 @@
 .Fn hid_usage_page "int i"
 .Ft char *
 .Fn hid_usage_in_page "u_int u"
+.Ft int
+.Fn hid_parse_usage_page "const char *"
+.Ft char *
+.Fn hid_parse_usage_in_page "const char *"
 .Ft void
 .Fn hid_init "char *file"
 .Ft int
@@ -162,7 +166,19 @@ will return the symbolic name of a usage page, and the function
 .Fn hid_usage_in_page
 will return the symbolic name of the usage within the page.
 Both these functions may return a pointer to static data.
-Before either of these functions can be called the usage table
+.Pp
+The functions
+.Fn hid_parse_usage_page
+and
+.Fn hid_parse_usage_in_page
+are the inverses of
+.Fn hid_usage_page
+and
+.Fn hid_usage_in_page .
+They take a usage string and return the number of the usage, or -1
+if it cannot be found.
+.Pp
+Before any of these functions can be called the usage table
 must be parsed, this is done by calling
 .Fn hid_init
 with the name of the table.  Passing