1 files changed, 28 insertions, 0 deletions
diff --git a/common.h b/common.h
new file mode 100644
index 0000000..f737e2f
--- /dev/null
+++ b/common.h
@@ -0,0 +1,28 @@
+#include <stdint.h>
+#include <stdio.h>
+
+typedef uint8_t u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+
+// To serialize the text that could be arbitrary length the lenght is encoded after the author
+// string and before the text.
+struct message {
+    char timestamp[9]; // HH:MM:SS
+    char author[12];
+    u16 len;
+    char *text;
+};
+
+// printf without buffering using write syscall, works when using sockets
+void writef(char *format, ...);
+
+u16 str_len(char *str);
+void str_cpy(char *to, char *from);
+
+// save the message msg to file in binary format, returns zero on success, returns 1 if the msg.text
+// was empty which should not be allowed.
+u8 save_message(struct message *msg, FILE *f);
+// load the message msg from file f, returns zero on success, returns 1 if the msg.text
+// was empty which should not be allowed.
+u8 load_message(struct message *msg, FILE *f);