1 files changed, 100 insertions, 0 deletions
diff --git a/src/tailer/tailer.c b/src/tailer/tailer.c
new file mode 100644
index 0000000..c8fbfbf
--- /dev/null
+++ b/src/tailer/tailer.c
@@ -0,0 +1,100 @@
+/**
+ * Copyright (c) 2021, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __COSMOPOLITAN__
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdint.h>
+#endif
+
+#include "sha-256.h"
+#include "tailer.h"
+
+ssize_t send_packet(int fd,
+                    tailer_packet_type_t tpt,
+                    tailer_packet_payload_type_t payload_type,
+                    ...)
+{
+    va_list args;
+    int done = 0;
+
+    va_start(args, payload_type);
+    write(fd, &tpt, sizeof(tpt));
+    do {
+        write(fd, &payload_type, sizeof(payload_type));
+        switch (payload_type) {
+            case TPPT_STRING: {
+                char *str = va_arg(args, char *);
+                uint32_t length = strlen(str);
+
+                write(fd, &length, sizeof(length));
+                write(fd, str, length);
+                break;
+            }
+            case TPPT_HASH: {
+                const char *hash = va_arg(args, const char *);
+
+                write(fd, hash, SHA256_BLOCK_SIZE);
+                break;
+            }
+            case TPPT_INT64: {
+                int64_t i = va_arg(args, int64_t);
+
+                write(fd, &i, sizeof(i));
+                break;
+            }
+            case TPPT_BITS: {
+                int32_t length = va_arg(args, int32_t);
+                const char *bits = va_arg(args, const char *);
+
+                write(fd, &length, sizeof(length));
+                write(fd, bits, length);
+                break;
+            }
+            case TPPT_DONE: {
+                done = 1;
+                break;
+            }
+            default: {
+                assert(0);
+                break;
+            }
+        }
+
+        if (!done) {
+            payload_type = va_arg(args, tailer_packet_payload_type_t);
+        }
+    } while (!done);
+    va_end(args);
+
+    return 0;
+}