1 files changed, 49 insertions, 0 deletions
diff --git a/tests/test_version_cmp.c b/tests/test_version_cmp.c
new file mode 100644
index 0000000..98667d6
--- /dev/null
+++ b/tests/test_version_cmp.c
@@ -0,0 +1,49 @@
+// Used for "../configure.ac".
+
+#include <ctype.h>
+#include <stdlib.h>
+
+static int version_cmp (const char *v1, const char *v2)
+{
+   const char *s1 = v1, *s2 = v2;
+   while (*s1 && *s2) {
+      if (isdigit (*s1) && isdigit (*s2)) {
+         char buf1[10], buf2[10];
+         int n1 = 0, n2 = 0;
+
+         while (isdigit (*s1)) {
+            if (n1 < 9) buf1[n1++] = *s1;
+            s1++;
+         }
+
+         while (isdigit (*s2)) {
+            if (n2 < 9) buf2[n2++] = *s2;
+            s2++;
+         }
+
+         buf1[n1] = buf2[n2] = 0;
+         int c = atoi (buf1) - atoi (buf2);
+         if (c != 0)
+            return c;
+      } else {
+         if (*s1 != *s2)
+            return *s1 - *s2;
+         s1++;
+         s2++;
+      }
+   }
+
+   return *s1 - *s2;
+}
+
+#include <stdio.h>
+
+int main (int argc, char *argv[])
+{
+   printf ("%d, %d, %d %d\n",
+           version_cmp ("0.1", "0.001"),
+           version_cmp ("0.1", "0.002"),
+           version_cmp ("0.1a", "0.1"),
+           version_cmp ("2.38.0", "2.38.1"));
+   return 0;
+}