libxbps: move xbps_pkgpattern_match to util.c and simplify.

lib/util.c

@@ -33,7 +33,7 @@
 #include <stdarg.h>
 #include <string.h>
 #include <errno.h>
-#include <ctype.h>
+#include <fnmatch.h>
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
@@ -304,3 +304,26 @@ xbps_xasprintf(const char *fmt, ...)
 
 	return buf;
 }
+
+/*
+ * Match pkg against pattern, return 1 if matching, 0 otherwise or -1 on error.
+ */
+int
+xbps_pkgpattern_match(const char *pkg, const char *pattern)
+{
+	/* simple match on "pkg" against "pattern */
+	if (strcmp(pattern, pkg) == 0)
+		return 1;
+
+	/* perform relational dewey match on version number */
+	if (strpbrk(pattern, "<>") != NULL)
+		return dewey_match(pattern, pkg);
+
+	/* glob match */
+	if (strpbrk(pattern, "*?[]") != NULL)
+		if (fnmatch(pattern, pkg, FNM_PERIOD) == 0)
+			return 1;
+
+	/* no match */
+	return 0;
+}