1 files changed, 125 insertions, 0 deletions
diff --git a/pgm7/msg.c b/pgm7/msg.c
new file mode 100644
index 0000000..f6ae0a5
--- /dev/null
+++ b/pgm7/msg.c
@@ -0,0 +1,125 @@
+/************************************************************************
+
+ Functions for reading and writing "messages" over virtual circuits for
+ the tic-tac-toe system.
+
+ Phil Kearns							         
+ April 12, 1998						         
+ 								         
+*************************************************************************/
+
+#include "common.h"
+
+void
+putmsg(int s, struct tttmsg *m)
+// int s               socket on which sending
+// struct tttmsg *m    pointer to the message to be sent
+
+{
+  int bytes_sofar, to_go, num;
+  char *addr;
+
+  bytes_sofar = 0;
+  to_go = sizeof(struct tttmsg);
+
+  addr = (char *) m;
+
+  while (to_go > 0) {
+    num = write(s, &(addr[bytes_sofar]), to_go);
+    if (num < 0) {
+      perror("putmsg");
+      exit(1);
+    }
+  to_go -= num; bytes_sofar += num;  
+  }
+}
+
+void
+getmsg(int s, struct tttmsg *m)
+// int s              socket on which receiving
+// struct tttmsg *m   container for the message
+
+{
+  int bytes_sofar, to_go, num;
+  char *addr;
+
+  bytes_sofar = 0;
+  to_go = sizeof(struct tttmsg);
+
+  addr = (char *) m;
+
+  while (to_go > 0) {
+    num = read(s, &(addr[bytes_sofar]), to_go);
+    if (num < 0) {
+      perror("putmsg");
+          exit(1);
+    }
+    if (num == 0) {
+      fprintf(stderr, "Unexpected EOF\n");
+      exit(1);
+    }
+    to_go -= num; bytes_sofar += num;
+  }
+}
+
+void
+protocol_error(char expected, struct tttmsg *offender)
+
+{
+  char *stype;
+
+  fprintf(stderr, "Protocol error: expected ");
+  switch (expected) {
+  case 'A':
+    stype = "WHO"; break;
+  case 'B':
+    stype = "HANDLE"; break;
+  case 'C':
+    stype = "MATCH"; break;
+  case 'D':
+    stype = "WHATMOVE"; break;
+  case 'E':
+    stype = "MOVE"; break;
+  case 'F':
+    stype = "RESULT"; break;
+  default:
+    stype = "UNKNOWN"; break;
+  }
+  fprintf(stderr, "%s message; got following message:\n", stype);
+  dumpmsg(offender);
+  exit(1);
+}
+
+void
+dumpmsg(struct tttmsg *m)
+
+{
+  char *stype, datastring[32];
+  int i;
+  
+  switch (m->type) {
+  case 'A':
+    stype = "WHO"; break;
+  case 'B':
+    stype = "HANDLE"; break;
+  case 'C':
+    stype = "MATCH"; break;
+  case 'D':
+    stype = "WHATMOVE"; break;
+  case 'E':
+    stype = "MOVE"; break;
+  case 'F':
+    stype = "RESULT"; break;
+  default:
+    stype = "UNKNOWN"; break;
+  }
+  fprintf(stderr,"\tTYPE:     %s\n",stype);
+  fprintf(stderr,"\tBOARD:    [");
+  for (i=0; i<8; i++)
+    fprintf(stderr,"%c,",m->board[i]);
+  fprintf(stderr,"%c]\n",m->board[8]);
+  bcopy(datastring,&(m->data),31);
+  datastring[31]='\0';
+  fprintf(stderr,"\tDATA:     %s\n", datastring);
+  fprintf(stderr,"\tRES:      %c\n", m->res);
+}