Network code updated. (simplest solution possible)

It works!

src/net.c

@@ -32,6 +32,16 @@ errx(int eval, const char *fmt, ...) {
     exit(eval);
 }
 
+struct file {
+    int fd;
+    char ibuf[BUFSIZ];
+    char obuf[BUFSIZ];
+    int istart;
+    int iend;
+    int oend;
+} sfile[2];
+
+
 void
 net_server(int port) {
     struct sockaddr_in serveraddr;
@@ -44,34 +54,30 @@ net_server(int port) {
     if (servsock<0)
 	errx(1, "socket: %s\n", strerror(errno));
     int r;
-    do r=bind(servsock, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
+    do {
-    while ((r<0) && (errno==EADDRINUSE));
+	r=bind(servsock, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
+	serveraddr.sin_port = htons(port++);
+    } while ((r<0) && (errno==EADDRINUSE));
     if (r < 0)
 	errx(1, "bind port %d: %s\n", port, strerror(errno));
     if (listen(servsock, 10) < 0)
 	errx(1, "listen: %s\n", strerror(errno));
 #if 1
     // FIXME Temporary startup. Use net_poll for this later:
-    printf("Waiting for connections...\n");
+    printf("Waiting for connections on port %d...\n", port-1);
     for (int i=0; i<2; i++) {
 	struct sockaddr_in clientaddr;
 	int cfd;
 	socklen_t slen;
-	FILE *f;
 	cfd=accept(servsock, (struct sockaddr *)&clientaddr, &slen);
 	if (cfd<0)
 	    errx(1, "accept: %s\n", strerror(errno));
 	// FIXME log, shout, or something
 	printf("client log on...\n");
-	f = fdopen(cfd, "r+");
+	sfile[i].fd=cfd;
-	if (!f)
+	net_side_printf(i, "Welcome!\n");
-	    errx(1, "fdopen: %s\n", strerror(errno));
-	setlinebuf(f);
-	fprintf(f, "Welcome!\n");
 	if (i==0)
-	    fprintf(f, "Waiting for another player...\n");
+	    net_side_printf(i, "Waiting for another player...\n");
-	fflush(f);
-	net_side[i]=f;
     }
     net_all_printf("Starting game\n");
 #else
@@ -84,10 +90,102 @@ net_server(int port) {
 #endif
 }
 
+
+#if 1
+int
+net_getc(int side) {
+    char c;
+    int n;
+    assert(side==0 || side==1);
+    n=read(sfile[side].fd, &c, 1);
+    if (n<0) return -1;
+    return c;
+}
+void
+net_all_flush() { 
+}
+
+void
+net_side_printf(int side, const char *fmt, ...) {
+    va_list ap;
+    char buf[BUFSIZ];
+    int len, n;
+    assert((side==0) || (side==1));
+    va_start(ap, fmt);
+    len=vsnprintf(buf, sizeof(buf)-1, fmt, ap);
+    va_end(ap);
+    if (len > BUFSIZ-1)
+	errx(1, "BUFSIZ too small\n");
+    char *bufp=buf;
+    do {
+	n=write(sfile[side].fd, bufp, len);
+	if (n<0)
+	    errx(1, "write: %s\n", strerror(errno));
+	bufp+=n;
+    } while (bufp < buf+len);
+}
+
+void
+net_all_printf(const char *fmt, ...) {
+    va_list ap;
+    char buf[BUFSIZ];
+    int len, n;
+    va_start(ap, fmt);
+    len=vsnprintf(buf, sizeof(buf)-1, fmt, ap);
+    va_end(ap);
+    if (len > BUFSIZ-1)
+	errx(1, "BUFSIZ too small\n");
+    for (int side=0; side<2; side++) {
+	char *bufp=buf;
+	do {
+	    n=write(sfile[side].fd, bufp, len);
+	    if (n<0)
+		errx(1, "write: %s\n", strerror(errno));
+	    bufp+=n;
+	} while (bufp < buf+len);
+    }
+}
+
+
+
+#else
+#define net_getc2(f) (f.iend<BUFSIZ||net_fillbuf(f), f.ibuf[f.iend++])
+#define net_getc(side) net_getc2(sfile[side])
+
+void
+net_fillbuf(struct file f) {
+    n=read(f.fd, f.ibuf, BUFSIZ);
+    if (n==0)
+	errx(1, "end of file\n");
+    if (n<0)
+	errx(1, "read: %s\n", strerror(errno));
+    f.iend=n;
+}
+
+
+void
+net_side_flush(int side) {
+    start=0;
+    do start+=write(fd[side], obuf[side]+start, obufend);
+    while (start < obufend);
+}
+
 void
 net_all_flush() {
     for (int i=0; i<2; i++)
-	fflush(net_side[i]);
+	net_side_flush(i);
+}
+
+static void
+net_side_vprintf(int side, const char *fmt, va_list ap) {
+    n=vsnprintf(obuf[side], BUFSIZ-obufend, fmt, ap);
+    if (n > (BUFSIZ-obufend-1)) {
+	if (n > BUFSIZ-1)
+	    errx(1, "BUFSIZ too small\n");
+	net_side_flush(side);
+	n=vsnprintf(obuf[side], BUFSIZ-obufend, fmt, ap);
+    }
+    obufend[side]+=n;
 }
 
 void
@@ -95,7 +193,7 @@ net_all_printf(const char *fmt, ...) {
     va_list ap;
     va_start(ap, fmt);
     for (int i=0; i<2; i++)
-	vfprintf(net_side[i], fmt, ap);
+	net_side_vprintf(i, fmt, ap);
     va_end(ap);
 }
 
@@ -104,10 +202,10 @@ net_side_printf(int side, const char *fmt, ...) {
     va_list ap;
     assert((side==0) || (side==1));
     va_start(ap, fmt);
-    vfprintf(net_side[side], fmt, ap);
+    net_side_vprintf(side, fmt, ap);
     va_end(ap);
 }
-
+#endif
 
 
 void

src/net.h

@@ -5,12 +5,10 @@
 
 #include <stdio.h>
 
-extern FILE *net_side[2];
-
-#define net_getc(side) getc(net_side[i])
 
 extern void net_server(int port);
 
+extern int  net_getc(int side);
 extern void net_all_printf(const char *fmt, ...);
 extern void net_side_printf(int side, const char *fmt, ...);
 extern void net_all_flush();