1 files changed, 53 insertions, 0 deletions
diff --git a/filehash.c b/filehash.c
new file mode 100644
index 0000000..5616226
--- /dev/null
+++ b/filehash.c
@@ -0,0 +1,53 @@
+#include "filehash.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+struct filehash_t
+{
+    const char *hash_program;
+    const char **argv;
+    unsigned max_per_invocation;
+};
+
+filehash_t *filehash_new(const char *hash_program, unsigned max_per_invocation)
+{
+    filehash_t *fh;
+
+    fh = malloc(sizeof(filehash_t));
+    if (!fh)
+        return NULL;
+
+    *fh = (filehash_t){
+        .hash_program = strdup(hash_program),
+        .max_per_invocation = max_per_invocation,
+        .argv = reallocarray(
+            NULL,
+            1 + max_per_invocation,
+            sizeof(const char *)
+        ),
+    };
+
+    if (!fh->hash_program)
+        goto fail;
+    if (!fh->argv)
+        goto fail;
+
+    fh->argv[max_per_invocation] = NULL;
+
+    return fh;
+
+fail:
+    filehash_free(fh);
+    return NULL;
+}
+
+void filehash_free(filehash_t *fh)
+{
+    if (!fh)
+        return;
+
+    free(fh->argv);
+    free((void *)fh->hash_program);
+    free(fh);
+}