1 files changed, 64 insertions, 0 deletions
diff --git a/lib/vercmp.c b/lib/vercmp.c
new file mode 100644
index 000000000..a2fac63b2
--- /dev/null
+++ b/lib/vercmp.c
@@ -0,0 +1,64 @@
+/*
+ * libdpkg - Debian packaging suite library routines
+ * vercmp.c - comparison of version numbers
+ *
+ * Copyright (C) 1995 Ian Jackson <iwj10@cus.cam.ac.uk>
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with dpkg; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ctype.h>
+#include <string.h>
+
+#include "config.h"
+#include "dpkg.h"
+#include "dpkg-db.h"
+#include "parsedump.h"
+
+static int verrevcmp(const char *val, const char *ref) {
+  int vc, rc;
+  long vl, rl;
+  const char *vp, *rp;
+
+  if (!val) val= "";
+  if (!ref) ref= "";
+  for (;;) {
+    vp= val;  while (*vp && !isdigit(*vp)) vp++;
+    rp= ref;  while (*rp && !isdigit(*rp)) rp++;
+    for (;;) {
+      vc= val == vp ? 0 : *val++;
+      rc= ref == rp ? 0 : *ref++;
+      if (!rc && !vc) break;
+      if (vc && !isalpha(vc)) vc += 256; /* assumes ASCII character set */
+      if (rc && !isalpha(rc)) rc += 256;
+      if (vc != rc) return vc - rc;
+    }
+    val= vp;
+    ref= rp;
+    vl=0;  if (isdigit(*vp)) vl= strtol(val,(char**)&val,10);
+    rl=0;  if (isdigit(*rp)) rl= strtol(ref,(char**)&ref,10);
+    if (vl != rl) return vl - rl;
+    if (!*val && !*ref) return 0;
+    if (!*val) return -1;
+    if (!*ref) return +1;
+  }
+}
+
+int versioncompare(const char *version, const char *revision,
+                   const char *refversion, const char *refrevision) {
+  int r;
+  r= verrevcmp(version,refversion);  if (r) return r;
+  return verrevcmp(revision,refrevision);
+}