fixes for building with MSVC

Author: YuguoZhang

src/compression.c

@@ -18,6 +18,9 @@
 #include <errno.h>
 
 #include "common.h"
+#ifdef _MSC_VER
+#define strcasecmp _stricmp
+#endif
 
 #ifndef STROPHE_COMPRESSION_BUFFER_SIZE
 /** Max buffer size for compressed data (send & receive). */
@@ -110,7 +113,7 @@ static int
 _compression_write(xmpp_conn_t *conn, const void *buff, size_t len, int flush)
 {
     int ret;
-    const void *buff_end = buff + len;
+    const void *buff_end = (const char*)buff + len;
     struct xmpp_compression *comp = conn->compression.state;
     comp->compression.stream.next_in = (Bytef *)buff;
     comp->compression.stream.avail_in = len;
@@ -201,7 +204,7 @@ static void *_zlib_alloc(void *opaque, unsigned int items, unsigned int size)
 static void _init_zlib_compression(xmpp_ctx_t *ctx, struct zlib_compression *s)
 {
     s->buffer = strophe_alloc(ctx, STROPHE_COMPRESSION_BUFFER_SIZE);
-    s->buffer_end = s->buffer + STROPHE_COMPRESSION_BUFFER_SIZE;
+    s->buffer_end = (const char*)s->buffer + STROPHE_COMPRESSION_BUFFER_SIZE;
 
     s->stream.opaque = ctx;
     s->stream.zalloc = _zlib_alloc;

src/conn.c

@@ -21,7 +21,9 @@
  */
 
 #include <errno.h>
+#ifndef _MSC_VER
 #include <netinet/in.h>
+#endif
 #include <stdarg.h>
 #include <string.h>
 #include <limits.h>

src/resolver.c

@@ -982,7 +982,7 @@ resolver_win32_srv_query(const char *fulldomain, unsigned char *buf, size_t len)
                     insize = recvfrom(sock, (char *)buf, (int)len, 0,
                                       (struct sockaddr *)&dnsaddr, &addrlen);
                     if (insize == SOCKET_ERROR) {
-                        if (sock_error() == WSAEWOULDBLOCK) {
+                        if (sock_error(NULL) == WSAEWOULDBLOCK) {
                             Sleep(100);
                         } else {
                             break;

src/tls.c

@@ -29,6 +29,10 @@
 #include "strophe.h"
 
 #include "common.h"
+#ifdef _MSC_VER
+#include <BaseTsd.h>
+typedef SSIZE_T ssize_t;
+#endif
 
 const struct conn_interface tls_intf = {
     tls_read,

src/tls_schannel.c

@@ -266,7 +266,7 @@ int tls_start(tls_t *tls)
 
     /* use the domain there as our name */
     name = tls->conn->domain;
-    intf = tls->conn->intf;
+    intf = &tls->conn->intf;
 
     ctxtreq = ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT |
               ISC_REQ_CONFIDENTIALITY | ISC_RET_EXTENDED_ERROR |