bitops: new module.

[ccan] / ccan / bitops / _info

diff --git a/ccan/bitops/_info b/ccan/bitops/_info
new file mode 100644 (file)
index 0000000..d47fe7b
--- /dev/null
+++ b/ccan/bitops/_info
@@ -0,0 +1,43 @@
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+
+/**
+ * bitops - bit counting routines
+ *
+ * These offer convenience wrappers around (and, as necessary,
+ * replacements for) the builtin bit testing/counting routines.
+ *
+ * Example:
+ * #include <ccan/bitops/bitops.h>
+ * #include <stdio.h>
+ *
+ * int main(int argc, char *argv[])
+ * {
+ *     unsigned int v = atoi(argv[1]);
+ *
+ *     printf("Number of 1 bits: %i\n", bitops_weight32(v));
+ *     if (v != 0) {
+ *             printf("Least-significant set bit: %i\n", bitops_ls32(v));
+ *             printf("Most-significant set bit: %i\n", bitops_hs32(v));
+ *             printf("Least-significant clear bit: %i\n", bitops_lc32(v));
+ *             printf("Most-significant clear bit: %i\n", bitops_hc32(v));
+ *     }
+ *     return 0;
+ * }
+ *
+ * License: CC0 (Public Domain)
+ * Author: Rusty Russell <rusty@rustcorp.com.au>
+ */
+int main(int argc, char *argv[])
+{
+       /* Expect exactly one argument */
+       if (argc != 2)
+               return 1;
+
+       if (strcmp(argv[1], "depends") == 0) {
+               return 0;
+       }
+
+       return 1;
+}