1 files changed, 24 insertions, 0 deletions
diff --git a/util/compat.c b/util/compat.c
new file mode 100644
index 0000000..aca558a
--- /dev/null
+++ b/util/compat.c
@@ -0,0 +1,24 @@
+int
+hextobyte (const char *s)
+{
+  int c;
+
+  if ( *s >= '0' && *s <= '9' )
+    c = 16 * (*s - '0');
+  else if ( *s >= 'A' && *s <= 'F' )
+    c = 16 * (10 + *s - 'A');
+  else if ( *s >= 'a' && *s <= 'f' )
+    c = 16 * (10 + *s - 'a');
+  else
+    return -1;
+  s++;
+  if ( *s >= '0' && *s <= '9' )
+    c += *s - '0';
+  else if ( *s >= 'A' && *s <= 'F' )
+    c += 10 + *s - 'A';
+  else if ( *s >= 'a' && *s <= 'f' )
+    c += 10 + *s - 'a';
+  else
+    return -1;
+  return c;
+}