1 files changed, 61 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..6914de0
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,61 @@
+#include "config.h"
+
+#include "random-seed.h"
+#include "util.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+
+static inline void usage() {
+    puts("usage: random-seed MODE FILE");
+    puts("see random-seed(8) for more information.");
+}
+
+static inline void caprlimit(int resource, rlim_t rlimit) {
+    struct rlimit rlim;
+    if (getrlimit(resource, &rlim) == -1) {
+        perror("warning: couldn't get resource limit");
+        return;
+    }
+    if (rlim.rlim_cur > rlimit) {
+        rlim.rlim_cur = rlimit;
+        if (setrlimit(resource, &rlim) == -1) {
+            perror("warning: couldn't set resource limit");
+            return;
+        }
+    }
+}
+
+int main(int argc, char *argv[]) {
+    char *mode, *seed_path;
+
+    switch (argc) {
+        case 2:
+            if (streq(argv[1], "-h") || streq(argv[1], "--help")) {
+                usage();
+                exit(0);
+            }
+            if (streq(argv[1], "-V") || streq(argv[1], "--version")) {
+                printf("random-seed %s\n", PACKAGE_VERSION);
+                exit(0);
+            }
+            mode = argv[1];
+            seed_path = DEFAULT_SEED_PATH;
+            break;
+        case 3:
+            mode = argv[1];
+            seed_path = argv[2];
+            break;
+        default:
+            fprintf(stderr, "error: invalid arguments\n");
+            usage();
+            exit(2);
+    }
+
+    umask(0);
+    caprlimit(RLIMIT_DATA, 32*1024*1024);
+    caprlimit(RLIMIT_FSIZE, 1*1024*1024);
+    run(mode, seed_path);
+}