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/*
* Common/shared macros and routines.
*
* This file contains macros of the form
*
* mph_return_if_TYPE_overflow(val);
*
* Which tests `val' for a TYPE underflow/overflow (that is, is `val' within
* the range for TYPE?). If `val' can't fit in TYPE, errno is set to
* EOVERFLOW, and `return -1' is executed (which is why it's a macro).
*
* Assumptions:
*
* I'm working from GLibc, so that's the basis for my assumptions. They may
* not be completely portable, in which case I'll need to fix my assumptions.
* :-(
*
* See the typedefs for type size assumptions. These typedefs *must* be kept
* in sync with the types used in Mono.Posix.dll.
*
* See also:
* http://developer.apple.com/documentation/Darwin/Reference/ManPages/
*/
#ifndef INC_mph_H
#define INC_mph_H
#include <config.h>
#include <stddef.h> /* offsetof */
#include <limits.h> /* LONG_MAX, ULONG_MAX */
#include <errno.h> /* for ERANGE */
#include <glib.h> /* for g* types, etc. */
#ifdef HAVE_STDINT_H
#include <stdint.h> /* for SIZE_MAX */
#endif
#if __APPLE__ || __BSD__ || __FreeBSD__ || __OpenBSD__
#define MPH_ON_BSD
#endif
#ifdef HAVE_VISIBILITY_HIDDEN
#define MPH_INTERNAL __attribute__((visibility("hidden")))
#else
#define MPH_INTERNAL
#endif
#if !defined(EOVERFLOW)
# if defined(HOST_WIN32)
# define EOVERFLOW 75
# elif defined(__OpenBSD__)
# define EOVERFLOW 87
# endif
#endif /* !defined(EOVERFLOW) */
#if !defined (HOST_WIN32)
/*
* Solaris doesn't define these BSD values, and if they're not present then
* map.c:Mono_Posix_FromSeekFlags() breaks badly; see:
* http://bugzilla.gnome.org/show_bug.cgi?id=370081
*/
#ifndef L_SET
#define L_SET SEEK_SET
#endif /* ndef L_SET */
#ifndef L_INCR
#define L_INCR SEEK_CUR
#endif /* ndef L_INCR */
#ifndef L_XTND
#define L_XTND SEEK_END
#endif /* ndef L_XTND */
/*
* OS X doesn't define MAP_ANONYMOUS, but it does define MAP_ANON.
* Alias them to fix: https://bugzilla.xamarin.com/show_bug.cgi?id=3419
*/
#ifdef PLATFORM_MACOSX
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif /* ndef MAP_ANONYMOUS */
#endif /* ndef PLATFORM_MACOSX */
/*
* XATTR_AUTO is a synonym for 0 within XattrFlags, but most systems don't
* define it. map.c doesn't know that, though, so we ensure that it's defined
* so that the value 0 round-trips through MonoPosixHelper.
*/
#ifndef XATTR_AUTO
#define XATTR_AUTO 0
#endif /* ndef XATTR_AUTO */
#endif /* ndef HOST_WIN32 */
typedef gint64 mph_blkcnt_t;
typedef gint64 mph_blksize_t;
typedef guint64 mph_dev_t;
typedef guint64 mph_ino_t;
typedef guint64 mph_nlink_t;
typedef gint64 mph_off_t;
typedef guint64 mph_size_t;
typedef gint64 mph_ssize_t;
typedef gint32 mph_pid_t;
typedef guint32 mph_gid_t;
typedef guint32 mph_uid_t;
typedef gint64 mph_time_t;
typedef gint64 mph_clock_t;
typedef guint64 mph_fsblkcnt_t;
typedef guint64 mph_fsfilcnt_t;
/* Some versions of OS X don't define these typedefs, needed by map.c */
#ifndef HAVE_BLKCNT_T
typedef mph_blkcnt_t blkcnt_t;
#endif
#ifndef HAVE_BLKSIZE_T
typedef mph_blksize_t blksize_t;
#endif
#ifndef HAVE_SUSECONDS_T
typedef gint64 suseconds_t;
#endif
#ifdef HAVE_LARGE_FILE_SUPPORT
#define MPH_OFF_T_MAX G_MAXINT64
#define MPH_OFF_T_MIN G_MININT64
#else
#define MPH_OFF_T_MAX G_MAXINT32
#define MPH_OFF_T_MIN G_MININT32
#endif
#ifdef SIZE_MAX
#define MPH_SIZE_T_MAX SIZE_MAX
#elif SIZEOF_SIZE_T == 8
#define MPH_SIZE_T_MAX G_MAXUINT64
#elif SIZEOF_SIZE_T == 4
#define MPH_SIZE_T_MAX G_MAXUINT32
#else
#error "sizeof(size_t) is unknown!"
#endif
#define _mph_return_val_if_cb_(val, ret, cb) G_STMT_START{ \
if (cb (val)) { \
errno = EOVERFLOW; \
return ret; \
}}G_STMT_END
#define mph_have_long_overflow(var) ((var) > LONG_MAX || (var) < LONG_MIN)
#define mph_return_val_if_long_overflow(var, ret) \
_mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
#define mph_return_if_long_overflow(var) mph_return_val_if_long_overflow(var, -1)
#define mph_have_ulong_overflow(var) ((var) > ULONG_MAX)
#define mph_return_val_if_ulong_overflow(var, ret) \
_mph_return_val_if_cb_(var, ret, mph_have_ulong_overflow)
#define mph_return_if_ulong_overflow(var) mph_return_val_if_ulong_overflow(var, -1)
#define mph_have_size_t_overflow(var) ((var) > MPH_SIZE_T_MAX)
#define mph_return_val_if_size_t_overflow(var, ret) \
_mph_return_val_if_cb_(var, ret, mph_have_size_t_overflow)
#define mph_return_val_if_ssize_t_overflow(var, ret) \
_mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
#define mph_return_if_size_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
#define mph_return_if_ssize_t_overflow(var) mph_return_val_if_ssize_t_overflow(var, -1)
#define mph_have_off_t_overflow(var) \
(((var) < MPH_OFF_T_MIN) || ((var) > MPH_OFF_T_MAX))
#define mph_return_val_if_off_t_overflow(var, ret) \
_mph_return_val_if_cb_(var, ret, mph_have_off_t_overflow)
#define mph_return_if_off_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
#define mph_return_if_time_t_overflow(var) mph_return_if_long_overflow(var)
#define mph_return_if_val_in_list5(var,a,b,c,d,e) \
do { \
int v = (var); \
if (v == a || v == b || v == c || v == d || v == e) \
return -1; \
} while (0)
/*
* Helper function for functions which use ERANGE (such as getpwnam_r and
* getgrnam_r). These functions accept buffers which are dynamically
* allocated so that they're only as large as necessary. However, Linux and
* Mac OS X differ on how to signal an error value.
*
* Linux returns the error value directly, while Mac OS X is more traditional,
* returning -1 and setting errno accordingly.
*
* Unify the checking in one place.
*/
static inline int
recheck_range (int ret)
{
if (ret == ERANGE)
return 1;
if (ret == -1)
return errno == ERANGE;
return 0;
}
typedef unsigned int mph_string_offset_t;
enum {
MPH_STRING_OFFSET_PTR = 0x0,
MPH_STRING_OFFSET_ARRAY = 0x1,
MPH_STRING_OFFSET_MASK = 0x1
};
#define MPH_STRING_OFFSET(type,member,kind) ((offsetof(type,member) << 1) | kind)
MPH_INTERNAL char*
_mph_copy_structure_strings (
void *to, const mph_string_offset_t *to_offsets,
const void *from, const mph_string_offset_t *from_offsets,
size_t num_strings);
#endif /* ndef INC_mph_H */
/*
* vim: noexpandtab
*/
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