support/mph.h

   1 /*
   2  * Common/shared macros and routines.
   3  *
   4  * This file contains macros of the form
   5  *
   6  *   mph_return_if_TYPE_overflow(val);
   7  *
   8  * Which tests `val' for a TYPE underflow/overflow (that is, is `val' within
   9  * the range for TYPE?).  If `val' can't fit in TYPE, errno is set to
  10  * EOVERFLOW, and `return -1' is executed (which is why it's a macro).
  11  *
  12  * Assumptions:
  13  *
  14  * I'm working from GLibc, so that's the basis for my assumptions.  They may
  15  * not be completely portable, in which case I'll need to fix my assumptions.
  16  * :-(
  17  *
  18  * See the typedefs for type size assumptions.  These typedefs *must* be kept
  19  * in sync with the types used in Mono.Posix.dll.
  20  *
  21  * See also:
  22  *   http://developer.apple.com/documentation/Darwin/Reference/ManPages/
  23  */
  24
  25 #ifndef INC_mph_H
  26 #define INC_mph_H
  27
  28 #include <config.h>
  29
  30 #include <stddef.h>             /* offsetof */
  31 #include <limits.h>             /* LONG_MAX, ULONG_MAX */
  32 #include <errno.h>              /* for ERANGE */
  33 #include <glib.h>               /* for g* types, etc. */
  34
  35 #ifdef HAVE_STDINT_H
  36 #include <stdint.h>             /* for SIZE_MAX */
  37 #endif
  38
  39 #if __APPLE__ || __BSD__ || __FreeBSD__ || __OpenBSD__
  40 #define MPH_ON_BSD
  41 #endif
  42
  43 #ifdef HAVE_VISIBILITY_HIDDEN
  44 #define MPH_INTERNAL __attribute__((visibility("hidden")))
  45 #else
  46 #define MPH_INTERNAL
  47 #endif
  48
  49 #if !defined(EOVERFLOW)
  50 #  if defined(HOST_WIN32)
  51 #    define EOVERFLOW 75
  52 #  elif defined(__OpenBSD__)
  53 #    define EOVERFLOW 87
  54 #  endif
  55 #endif /* !defined(EOVERFLOW) */
  56
  57 #if !defined (HOST_WIN32)
  58
  59 /*
  60  * Solaris doesn't define these BSD values, and if they're not present then
  61  * map.c:Mono_Posix_FromSeekFlags() breaks badly; see:
  62  * http://bugzilla.gnome.org/show_bug.cgi?id=370081
  63  */
  64
  65 #ifndef L_SET
  66 #define L_SET SEEK_SET
  67 #endif /* ndef L_SET */
  68
  69 #ifndef L_INCR
  70 #define L_INCR SEEK_CUR
  71 #endif /* ndef L_INCR */
  72
  73 #ifndef L_XTND
  74 #define L_XTND SEEK_END
  75 #endif /* ndef L_XTND */
  76
  77 /*
  78  * OS X doesn't define MAP_ANONYMOUS, but it does define MAP_ANON.
  79  * Alias them to fix: https://bugzilla.xamarin.com/show_bug.cgi?id=3419
  80  */
  81 #ifdef PLATFORM_MACOSX
  82 #ifndef MAP_ANONYMOUS
  83 #define MAP_ANONYMOUS MAP_ANON
  84 #endif  /* ndef MAP_ANONYMOUS */
  85 #endif  /* ndef PLATFORM_MACOSX */
  86
  87 /*
  88  * XATTR_AUTO is a synonym for 0 within XattrFlags, but most systems don't
  89  * define it.  map.c doesn't know that, though, so we ensure that it's defined
  90  * so that the value 0 round-trips through MonoPosixHelper.
  91  */
  92
  93 #ifndef XATTR_AUTO
  94 #define XATTR_AUTO 0
  95 #endif /* ndef XATTR_AUTO */
  96
  97 #endif /* ndef HOST_WIN32 */
  98
  99 typedef    gint64 mph_blkcnt_t;
 100 typedef    gint64 mph_blksize_t;
 101 typedef   guint64 mph_dev_t;
 102 typedef   guint64 mph_ino_t;
 103 typedef   guint64 mph_nlink_t;
 104 typedef    gint64 mph_off_t;
 105 typedef   guint64 mph_size_t;
 106 typedef    gint64 mph_ssize_t;
 107 typedef    gint32 mph_pid_t;
 108 typedef   guint32 mph_gid_t;
 109 typedef   guint32 mph_uid_t;
 110 typedef    gint64 mph_time_t;
 111 typedef    gint64 mph_clock_t;
 112 typedef   guint64 mph_fsblkcnt_t;
 113 typedef   guint64 mph_fsfilcnt_t;
 114
 115 /* Some versions of OS X don't define these typedefs, needed by map.c */
 116 #ifndef HAVE_BLKCNT_T
 117 typedef mph_blkcnt_t blkcnt_t;
 118 #endif
 119
 120 #ifndef HAVE_BLKSIZE_T
 121 typedef mph_blksize_t blksize_t;
 122 #endif
 123
 124 #ifndef HAVE_SUSECONDS_T
 125 typedef gint64 suseconds_t;
 126 #endif
 127
 128 #ifdef HAVE_LARGE_FILE_SUPPORT
 129 #define MPH_OFF_T_MAX G_MAXINT64
 130 #define MPH_OFF_T_MIN G_MININT64
 131 #else
 132 #define MPH_OFF_T_MAX G_MAXINT32
 133 #define MPH_OFF_T_MIN G_MININT32
 134 #endif
 135
 136 #ifdef SIZE_MAX
 137 #define MPH_SIZE_T_MAX SIZE_MAX
 138 #elif SIZEOF_SIZE_T == 8
 139 #define MPH_SIZE_T_MAX  G_MAXUINT64
 140 #elif SIZEOF_SIZE_T == 4
 141 #define MPH_SIZE_T_MAX  G_MAXUINT32
 142 #else
 143 #error "sizeof(size_t) is unknown!"
 144 #endif
 145
 146 #define _mph_return_val_if_cb_(val, ret, cb) G_STMT_START{ \
 147         if (cb (val)) { \
 148                 errno = EOVERFLOW; \
 149                 return ret; \
 150         }}G_STMT_END
 151
 152 #define mph_have_long_overflow(var) ((var) > LONG_MAX || (var) < LONG_MIN)
 153
 154 #define mph_return_val_if_long_overflow(var, ret) \
 155         _mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
 156
 157 #define mph_return_if_long_overflow(var) mph_return_val_if_long_overflow(var, -1)
 158
 159 #define mph_have_ulong_overflow(var) ((var) > ULONG_MAX)
 160
 161 #define mph_return_val_if_ulong_overflow(var, ret) \
 162         _mph_return_val_if_cb_(var, ret, mph_have_ulong_overflow)
 163
 164 #define mph_return_if_ulong_overflow(var) mph_return_val_if_ulong_overflow(var, -1)
 165
 166 #define mph_have_size_t_overflow(var) ((var) > MPH_SIZE_T_MAX)
 167
 168 #define mph_return_val_if_size_t_overflow(var, ret) \
 169         _mph_return_val_if_cb_(var, ret, mph_have_size_t_overflow)
 170
 171 #define mph_return_val_if_ssize_t_overflow(var, ret) \
 172         _mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
 173
 174 #define mph_return_if_size_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
 175
 176 #define mph_return_if_ssize_t_overflow(var) mph_return_val_if_ssize_t_overflow(var, -1)
 177
 178 #define mph_have_off_t_overflow(var) \
 179         (((var) < MPH_OFF_T_MIN) || ((var) > MPH_OFF_T_MAX))
 180
 181 #define mph_return_val_if_off_t_overflow(var, ret) \
 182         _mph_return_val_if_cb_(var, ret, mph_have_off_t_overflow)
 183
 184 #define mph_return_if_off_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
 185
 186 #define mph_return_if_time_t_overflow(var) mph_return_if_long_overflow(var)
 187
 188 #define mph_return_if_val_in_list5(var,a,b,c,d,e) \
 189         do {                                                            \
 190                 int v = (var);                                                \
 191                 if (v == a || v == b || v == c || v == d || v == e)           \
 192                         return -1;                                                  \
 193         } while (0)
 194
 195 /*
 196  * Helper function for functions which use ERANGE (such as getpwnam_r and
 197  * getgrnam_r).  These functions accept buffers which are dynamically
 198  * allocated so that they're only as large as necessary.  However, Linux and
 199  * Mac OS X differ on how to signal an error value.
 200  *
 201  * Linux returns the error value directly, while Mac OS X is more traditional,
 202  * returning -1 and setting errno accordingly.
 203  *
 204  * Unify the checking in one place.
 205  */
 206 static inline int
 207 recheck_range (int ret)
 208 {
 209         if (ret == ERANGE)
 210                 return 1;
 211         if (ret == -1)
 212                 return errno == ERANGE;
 213         return 0;
 214 }
 215
 216 typedef unsigned int mph_string_offset_t;
 217
 218 enum {
 219         MPH_STRING_OFFSET_PTR   = 0x0,
 220         MPH_STRING_OFFSET_ARRAY = 0x1,
 221         MPH_STRING_OFFSET_MASK  = 0x1
 222 };
 223
 224 #define MPH_STRING_OFFSET(type,member,kind) ((offsetof(type,member) << 1) | kind)
 225
 226 MPH_INTERNAL char*
 227 _mph_copy_structure_strings (
 228         void *to,         const mph_string_offset_t *to_offsets,
 229         const void *from, const mph_string_offset_t *from_offsets,
 230         size_t num_strings);
 231
 232 #endif /* ndef INC_mph_H */
 233
 234 /*
 235  * vim: noexpandtab
 236  */