2 * Common/shared macros and routines.
4 * This file contains macros of the form
6 * mph_return_if_TYPE_overflow(val);
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).
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.
18 * See the typedefs for type size assumptions. These typedefs *must* be kept
19 * in sync with the types used in Mono.Posix.dll.
22 * http://developer.apple.com/documentation/Darwin/Reference/ManPages/
30 #include <limits.h> /* LONG_MAX, ULONG_MAX */
31 #include <errno.h> /* for ERANGE */
32 #include <glib.h> /* for g* types, etc. */
35 #include <stdint.h> /* for SIZE_MAX */
38 #include "map-icalls.h"
40 #if __APPLE__ || __BSD__ || __FreeBSD__
44 #ifdef HAVE_VISIBILITY_HIDDEN
45 #define MPH_INTERNAL __attribute__((visibility("hidden")))
50 #if defined (PLATFORM_WIN32) && !defined (EOVERFLOW)
52 #endif /* def PLATFORM_WIN32 && ndef EOVERFLOW */
54 typedef gint64 mph_blkcnt_t
;
55 typedef gint64 mph_blksize_t
;
56 typedef guint64 mph_dev_t
;
57 typedef guint64 mph_ino_t
;
58 typedef guint64 mph_nlink_t
;
59 typedef gint64 mph_off_t
;
60 typedef guint64 mph_size_t
;
61 typedef gint64 mph_ssize_t
;
62 typedef gint32 mph_pid_t
;
63 typedef guint32 mph_gid_t
;
64 typedef guint32 mph_uid_t
;
65 typedef gint64 mph_time_t
;
66 typedef gint64 mph_clock_t
;
67 typedef guint64 mph_fsblkcnt_t
;
68 typedef guint64 mph_fsfilcnt_t
;
70 #ifdef HAVE_LARGE_FILE_SUPPORT
71 #define MPH_OFF_T_MAX G_MAXINT64
72 #define MPH_OFF_T_MIN G_MININT64
74 #define MPH_OFF_T_MAX G_MAXINT32
75 #define MPH_OFF_T_MIN G_MININT32
79 #define MPH_SIZE_T_MAX SIZE_MAX
80 #elif SIZEOF_SIZE_T == 8
81 #define MPH_SIZE_T_MAX G_MAXUINT64
82 #elif SIZEOF_SIZE_T == 4
83 #define MPH_SIZE_T_MAX G_MAXUINT32
85 #error "sizeof(size_t) is unknown!"
88 #define _mph_return_val_if_cb_(val, ret, cb) G_STMT_START{ \
94 #define mph_have_long_overflow(var) ((var) > LONG_MAX || (var) < LONG_MIN)
96 #define mph_return_val_if_long_overflow(var, ret) \
97 _mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
99 #define mph_return_if_long_overflow(var) mph_return_val_if_long_overflow(var, -1)
101 #define mph_have_ulong_overflow(var) ((var) > ULONG_MAX)
103 #define mph_return_val_if_ulong_overflow(var, ret) \
104 _mph_return_val_if_cb_(var, ret, mph_have_ulong_overflow)
106 #define mph_return_if_ulong_overflow(var) mph_return_val_if_ulong_overflow(var, -1)
108 #define mph_have_size_t_overflow(var) ((var) > MPH_SIZE_T_MAX)
110 #define mph_return_val_if_size_t_overflow(var, ret) \
111 _mph_return_val_if_cb_(var, ret, mph_have_size_t_overflow)
113 #define mph_return_val_if_ssize_t_overflow(var, ret) \
114 _mph_return_val_if_cb_(var, ret, mph_have_long_overflow)
116 #define mph_return_if_size_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
118 #define mph_return_if_ssize_t_overflow(var) mph_return_val_if_ssize_t_overflow(var, -1)
120 #define mph_have_off_t_overflow(var) \
121 (((var) < MPH_OFF_T_MIN) || ((var) > MPH_OFF_T_MAX))
123 #define mph_return_val_if_off_t_overflow(var, ret) \
124 _mph_return_val_if_cb_(var, ret, mph_have_off_t_overflow)
126 #define mph_return_if_off_t_overflow(var) mph_return_val_if_size_t_overflow(var, -1)
128 #define mph_return_if_time_t_overflow(var) mph_return_if_long_overflow(var)
131 * Helper function for functions which use ERANGE (such as getpwnam_r and
132 * getgrnam_r). These functions accept buffers which are dynamically
133 * allocated so that they're only as large as necessary. However, Linux and
134 * Mac OS X differ on how to signal an error value.
136 * Linux returns the error value directly, while Mac OS X is more traditional,
137 * returning -1 and setting errno accordingly.
139 * Unify the checking in one place.
142 recheck_range (int ret
)
147 return errno
== ERANGE
;
152 _mph_copy_structure_strings (
153 void *to
, const size_t *to_offsets
,
154 const void *from
, const size_t *from_offsets
,
157 #endif /* ndef INC_mph_H */