warnless: add wrapper function for read and write on Windows

lib/warnless.c

@@ -400,6 +400,20 @@ curl_socket_t curlx_sitosk(int i)
 
 #endif /* USE_WINSOCK */
 
+#if defined(WIN32) || defined(_WIN32)
+
+ssize_t curlx_read(int fd, void *buf, size_t count)
+{
+  return (ssize_t)read(fd, buf, curlx_uztoui(count));
+}
+
+ssize_t curlx_write(int fd, const void *buf, size_t count)
+{
+  return (ssize_t)write(fd, buf, curlx_uztoui(count));
+}
+
+#endif /* WIN32 || _WIN32 */
+
 #if defined(__INTEL_COMPILER) && defined(__unix__)
 
 int curlx_FD_ISSET(int fd, fd_set *fdset)

lib/warnless.h

@@ -60,6 +60,21 @@ curl_socket_t curlx_sitosk(int i);
 
 #endif /* USE_WINSOCK */
 
+#if defined(WIN32) || defined(_WIN32)
+
+ssize_t curlx_read(int fd, void *buf, size_t count);
+
+ssize_t curlx_write(int fd, const void *buf, size_t count);
+
+#ifndef BUILDING_WARNLESS_C
+#  undef  read
+#  define read(fd, buf, count)  curlx_read(fd, buf, count)
+#  undef  write
+#  define write(fd, buf, count) curlx_write(fd, buf, count)
+#endif
+
+#endif /* WIN32 || _WIN32 */
+
 #if defined(__INTEL_COMPILER) && defined(__unix__)
 
 int curlx_FD_ISSET(int fd, fd_set *fdset);

src/Makefile.inc

@@ -13,7 +13,8 @@ CURLX_ONES = \
 	../lib/strtoofft.c \
 	../lib/strdup.c \
 	../lib/rawstr.c \
-	../lib/nonblock.c
+	../lib/nonblock.c \
+	../lib/warnless.c
 
 CURL_CFILES = \
 	tool_binmode.c \