From 85c492a2bd5bb1a2619ad709f038576d30262fb5 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Mon, 8 Nov 2010 15:54:24 +0000
Subject: Tidied up sock.c

---
 sock.c | 190 +++++++++++++++++++++++++++++++++++++----------------------------
 1 file changed, 107 insertions(+), 83 deletions(-)

(limited to 'sock.c')

diff --git a/sock.c b/sock.c
index 03a7c39..f86b41a 100644
--- a/sock.c
+++ b/sock.c
@@ -1,130 +1,154 @@
 /*
     Reader/writer to TCP/IP socket
 */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <netdb.h>
 
-#include <stdio.h>
-#include <errno.h>
-
-char	*name;
-int	sock;
-
-char	*GetLine();
-int	Connect();
-
-main(argc,argv)
-int argc;
-char *argv[];
-
-{
-    struct sockaddr_in addr;
-    int addrlen;
-    char *p;
-    char buff[1024];
-    int len;
-
-    name=argv[0];
-
-    if (argc<3)
-	{
-	fprintf(stderr,"%s: usage %s host port [nowrite]\n",name,name);
-	exit(1);
-	}
-
-    Connect(argv[1],atoi(argv[2]));
-
-    /* Test to see how to get the connected local port number
-    */
-    addrlen=sizeof(addr);
-    if (getsockname(sock,&addr,&addrlen)!=0)
-	perror(name);
-
-    printf("%s: bound through port %d\n",name,ntohs(addr.sin_port));
-
-    while((argc==4)||(p=GetLine()))
-	{
-	if ((argc!=4)&&(write(sock,p,strlen(p))==-1))
-	    {
-	    perror(name);
-	    close(sock);
-	    exit(1);
-	    }
-
-	if ((len=read(sock,buff,1024))<=0)
-	    {
-	    perror(name);
-	    close(sock);
-	    exit(1);
-	    }
-	buff[len]=0;
-	printf("%s\n",buff);
-	}
-
-    close(sock);
-    printf("\n");
-
-    return(0);
-}
-
-
-char *GetLine()
+static const char	*name;
 
+static const char *GetLine(void)
 {
     static char buff[1024];
     int l;
 
     if (feof(stdin))
+    {
 	return(NULL);
+    }
 
     printf("> ");
 
-    if (!gets(buff))
+    if (!fgets(buff, sizeof buff, stdin))
+    {
 	return(NULL);
+    }
 
     l=strlen(buff);
 
-    if (buff[l-1]=='\n')
+    if (l > 0 && buff[l-1]=='\n')
+    {
 	buff[l-1]=0;
+    }
 
     if (strlen(buff))
-	return(buff);
+    {
+	return buff;
+    }
     else
-	return(GetLine());
+    {
+	return GetLine();
+    }
 }
 
 
-int Connect(n,p)
-char *n;
-int p;
-
+static int Connect(const char *n, int p)
 {
     struct hostent *remote;
     struct sockaddr_in addr;
+    int sock;
 
     if (!(remote=gethostbyname(n)))
-	{
+    {
 	fprintf(stderr,"%s: unknown host %s\n",name,n);
-	exit(1);
-	}
+	exit(EXIT_FAILURE);
+    }
 
-    bcopy(remote->h_addr,&addr.sin_addr,remote->h_length);
+    memcpy(&addr.sin_addr, remote->h_addr, remote->h_length);
 
     if ((sock=socket(AF_INET,SOCK_STREAM,0))==-1)
-	{
+    {
 	perror(name);
-	exit(1);
-	}
+	exit(EXIT_FAILURE);
+    }
 
     addr.sin_family=AF_INET;
     addr.sin_port=htons(p);
 
-    if (connect(sock,&addr,sizeof(addr))==-1)
-	{
+    if (connect(sock,(void*)&addr,sizeof(addr))==-1)
+    {
+	perror(name);
+	exit(EXIT_FAILURE);
+    }
+
+    return sock;
+}
+
+int main(int argc, char *argv[])
+{
+    struct sockaddr_in addr;
+    int addrlen;
+    const char *p;
+    char buff[1024];
+    int len;
+    int sock;
+    int no_read;
+    int no_write;
+
+    name=argv[0];
+
+    if (argc<3)
+    {
+	fprintf(stderr,"%s: usage %s host port [nowrite|noread]\n",name,name);
+	exit(EXIT_FAILURE);
+    }
+
+    if (argc > 3)
+    {
+    	no_read = strcmp(argv[3], "noread") == 0;
+    	no_write = strcmp(argv[3], "nowrite") == 0;
+    }
+    else
+    {
+    	no_read = 0;
+    	no_write = 0;
+    }
+
+    sock = Connect(argv[1],atoi(argv[2]));
+
+    /* Test to see how to get the connected local port number
+    */
+    addrlen=sizeof(addr);
+
+    if (getsockname(sock,(void*)&addr,&addrlen)!=0)
+    {
 	perror(name);
-	exit(1);
+    }
+
+    printf("%s: bound through port %d\n",name,ntohs(addr.sin_port));
+
+    while(no_write || (p=GetLine()))
+    {
+	if (!no_write && (write(sock,p,strlen(p))==-1))
+	{
+	    perror(name);
+	    close(sock);
+	    exit(EXIT_FAILURE);
 	}
+
+	if (!no_read)
+	{
+	    if ((len=read(sock,buff,1024))<=0)
+	    {
+		perror(name);
+		close(sock);
+		exit(EXIT_FAILURE);
+	    }
+
+	    buff[len]=0;
+	    printf("%s\n",buff);
+	}
+    }
+
+    close(sock);
+    printf("\n");
+
+    return EXIT_SUCCESS;
 }
-- 
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