Add support for building arc4random with MSVC.

By default, MSVC's stdlib.h defines min(), so we need to spell out something
less common to avoid picking it up.

ok deraadt@ beck@ miod@

1 files changed, 8 insertions, 7 deletions

diff --git a/src/lib/libc/crypt/arc4random.c b/src/lib/libc/crypt/arc4random.c
index 75cdff3bc4..5afc6a15ab 100644
--- a/src/lib/libc/crypt/arc4random.c
+++ b/src/lib/libc/crypt/arc4random.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: arc4random.c,v 1.52 2015/01/16 16:48:51 deraadt Exp $ */
+/*      $OpenBSD: arc4random.c,v 1.53 2015/09/10 18:53:50 bcook Exp $   */
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -36,12 +36,13 @@
 #define KEYSTREAM_ONLY
 #include "chacha_private.h"
 
-#define min(a, b) ((a) < (b) ? (a) : (b))
-#ifdef __GNUC__
+#define minimum(a, b) ((a) < (b) ? (a) : (b))
+
+#if defined(__GNUC__) || defined(_MSC_VER)
 #define inline __inline
-#else                           /* !__GNUC__ */
+#else                           /* __GNUC__ || _MSC_VER */
 #define inline
-#endif                          /* !__GNUC__ */
+#endif                          /* !__GNUC__ && !_MSC_VER */
 
 #define KEYSZ   32
 #define IVSZ    8
@@ -127,7 +128,7 @@ _rs_rekey(u_char *dat, size_t datlen)
         if (dat) {
                 size_t i, m;
 
-                m = min(datlen, KEYSZ + IVSZ);
+                m = minimum(datlen, KEYSZ + IVSZ);
                 for (i = 0; i < m; i++)
                         rsx->rs_buf[i] ^= dat[i];
         }
@@ -147,7 +148,7 @@ _rs_random_buf(void *_buf, size_t n)
         _rs_stir_if_needed(n);
         while (n > 0) {
                 if (rs->rs_have > 0) {
-                        m = min(n, rs->rs_have);
+                        m = minimum(n, rs->rs_have);
                         keystream = rsx->rs_buf + sizeof(rsx->rs_buf)
                             - rs->rs_have;
                         memcpy(buf, keystream, m);