1 files changed, 21 insertions, 0 deletions
diff --git a/utils/nullstrcmp.c b/utils/nullstrcmp.c
new file mode 100644
index 00000000..a9e50f40
--- /dev/null
+++ b/utils/nullstrcmp.c
@@ -0,0 +1,21 @@
+/*
+ * Compare two strings, just like strcmp, except that we tolerate null
+ * pointers as a legal input, and define them to compare before any
+ * non-null string (even the empty string).
+ */
+
+#include <string.h>
+
+#include "defs.h"
+#include "misc.h"
+
+int nullstrcmp(const char *a, const char *b)
+{
+    if (a == NULL && b == NULL)
+        return 0;
+    if (a == NULL)
+        return -1;
+    if (b == NULL)
+        return +1;
+    return strcmp(a, b);
+}