openbsd_compat.h

/*
 * Copyright The University of Chicago
 *
 * All Rights Reserved.
 */
 
#ifndef OPENBSD_COMPAT_H
#define OPENBSD_COMPAT_H
 
 
/* Everything defined here is something OpenBSD's libc supplies for free
    and glibc, Apple libc or mingw-w64 may not.  Nothing in here is specific
    to MD5; it is the OpenBSD-source-in-a-foreign-tree shim. */
 
#include "globus_i_gridftp_server_config.h"
 
/* mingw-w64's <sys/types.h> takes the _SIGSET_T_ guard for itself but only
    declares sigset_t when _POSIX is set, and globus_config.h does not set it
    until later.  Since the -include puts us ahead of everything, set it first
    or globus_common_include.h's own <sys/types.h> becomes a no-op and
    globus_thread.h has no sigset_t. */
#ifdef __MINGW32__
#ifndef _POSIX
#define _POSIX 1
#endif
#endif
 
/* First, so that the tests below see whatever the platform does define.  md5.c
    includes <sys/types.h> itself; it is repeated here because that is where
    <sys/cdefs.h> gets pulled in on the platforms that have one. */
#include <sys/types.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
 
/* DEF_WEAK() declares a weak alias for a libc-internal symbol in OpenBSD's
    build.  It has no meaning outside it. */
#ifndef DEF_WEAK
#define DEF_WEAK(x)
#endif
 
/* md5.h wraps its declarations in these.  They come from <sys/cdefs.h> on glibc
    and Apple libc; mingw-w64 has no such definitions. */
#ifndef __BEGIN_DECLS
#define __BEGIN_DECLS
#endif
#ifndef __END_DECLS
#define __END_DECLS
#endif
 
/* md5.h and md5.c spell their integer types the 4.4BSD way.  glibc and Apple
    libc provide them from <sys/types.h>, mingw-w64 does not.  HAVE_U_INT8_T and
    friends come from AC_CHECK_TYPES in configure.ac. */
#ifndef HAVE_U_INT8_T
typedef uint8_t u_int8_t;
#endif
#ifndef HAVE_U_INT32_T
typedef uint32_t u_int32_t;
#endif
#ifndef HAVE_U_INT64_T
typedef uint64_t u_int64_t;
#endif
 
/* MD5Final() clears the context with explicit_bzero().  glibc has had it since
    2.25; Apple libc and mingw-w64 have nothing by that name.  Writing through a
    volatile pointer is what keeps the stores from being optimized away, which
    is the entire reason upstream does not just call memset().
    HAVE_EXPLICIT_BZERO comes from AC_CHECK_FUNCS in configure.ac. */
#ifndef HAVE_EXPLICIT_BZERO
static inline void
explicit_bzero(void *buf, size_t len)
{
    volatile unsigned char *p = (volatile unsigned char *) buf;
 
    while (len-- > 0)
    {
        *p++ = 0;
    }
}
#endif
 
#endif /* OPENBSD_COMPAT_H */