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gtls: fix build when sizeof(long) < sizeof(void *)

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- Change gnutls pointer/int macros to pointer/curl_socket_t.
  Prior to this change they used long type as well.

The size of the `long` data type can be shorter than that of pointer
types. This is the case most notably on Windows.

If C99 were acceptable, we could simply use `intptr_t` here. But we
want to retain C89 compatibility.

Simply use the trick of performing pointer arithmetic with the NULL
pointer: to convert an integer `i` to a pointer, simply take the
address of the `i`th element of a hypothetical character array
starting at address NULL. To convert back, simply cast the pointer
difference.

Thanks to Jay Satiro for the initial modification to use curl_socket_t
instead of int/long.

Closes #1617

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
This commit is contained in:
Johannes Schindelin 2017-06-26 23:15:22 +02:00 committed by Daniel Stenberg
parent 3a48a13268
commit c0cdc68c7e
1 changed files with 9 additions and 11 deletions
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20
lib/vtls/gtls.c
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@ -60,15 +60,13 @@
/* The last #include file should be: */
#include "memdebug.h"
/*
Some hackish cast macros based on:
https://developer.gnome.org/glib/unstable/glib-Type-Conversion-Macros.html
*/
#ifndef GNUTLS_POINTER_TO_INT_CAST
#define GNUTLS_POINTER_TO_INT_CAST(p) ((int) (long) (p))
#ifndef GNUTLS_POINTER_TO_SOCKET_CAST
#define GNUTLS_POINTER_TO_SOCKET_CAST(p) \
((curl_socket_t) ((char *)(p) - (char *)NULL))
#endif
#ifndef GNUTLS_INT_TO_POINTER_CAST
#define GNUTLS_INT_TO_POINTER_CAST(i) ((void *) (long) (i))
#ifndef GNUTLS_SOCKET_TO_POINTER_CAST
#define GNUTLS_SOCKET_TO_POINTER_CAST(s) \
((void *) ((char *)NULL + (s)))
#endif
/* Enable GnuTLS debugging by defining GTLSDEBUG */
@ -153,7 +151,7 @@ static int gtls_mapped_sockerrno(void)
static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
{
ssize_t ret = swrite(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
ssize_t ret = swrite(GNUTLS_POINTER_TO_SOCKET_CAST(s), buf, len);
#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
if(ret < 0)
gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
@ -163,7 +161,7 @@ static ssize_t Curl_gtls_push(void *s, const void *buf, size_t len)
static ssize_t Curl_gtls_pull(void *s, void *buf, size_t len)
{
ssize_t ret = sread(GNUTLS_POINTER_TO_INT_CAST(s), buf, len);
ssize_t ret = sread(GNUTLS_POINTER_TO_SOCKET_CAST(s), buf, len);
#if defined(USE_WINSOCK) && !defined(GNUTLS_MAPS_WINSOCK_ERRORS)
if(ret < 0)
gnutls_transport_set_global_errno(gtls_mapped_sockerrno());
@ -850,7 +848,7 @@ gtls_connect_step1(struct connectdata *conn,
}
else {
/* file descriptor for the socket */
transport_ptr = GNUTLS_INT_TO_POINTER_CAST(conn->sock[sockindex]);
transport_ptr = GNUTLS_SOCKET_TO_POINTER_CAST(conn->sock[sockindex]);
gnutls_transport_push = Curl_gtls_push;
gnutls_transport_pull = Curl_gtls_pull;
}